LIFE TECHNOLOGIES INC
SC 13D/A, 2000-01-03
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934

                                (Amendment No. 7)

                         ------------------------------

                             LIFE TECHNOLOGIES, INC.
                                (Name of Issuer)

COMMON STOCK, $.01 PAR VALUE PER SHARE                          532177201
    (Title of class of securities)                            (CUSIP number)

                            RICHARD A. WEINBERG, ESQ.
                        C/O ISP MANAGEMENT COMPANY, INC.
                                 1361 ALPS ROAD
                             WAYNE, NEW JERSEY 07470
                                 (973) 628-3000
            (Name, address and telephone number of person authorized
                     to receive notices and communications)

                                 WITH A COPY TO:

                             STEPHEN E. JACOBS, ESQ.
                           WEIL, GOTSHAL & MANGES LLP
                                767 FIFTH AVENUE
                          NEW YORK, NEW YORK 10153-0119
                                 (212) 310-8000

                                 JANUARY 1, 2000
             (Date of event which requires filing of this statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of ss.ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-(g), check the
following box. [ ]

Note: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See ss. 240.13d-7 for other
parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purposes of Section 18 of the Securities Exchange Act of
1934 (the "Act") or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act. (However, see the
Notes.)

                         (Continued on following pages)

                              (Page 1 of 22 Pages)


================================================================================
NY2:\856524\04
<PAGE>

- -----------------------------------           ----------------------------------
CUSIP No. 532177201                    13D               Page 2 of 22 Pages
- -----------------------------------           ----------------------------------

- ------------------ -------------------------------------------------------------
        1          NAME OF REPORTING PERSON              ISP OPCO HOLDINGS INC.
                   S.S. OR I.R.S. IDENTIFICATION NO.
                   OF ABOVE PERSON

- ------------------ -------------------------------------------------------------
        2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:     (a) [X]
                                                                         (b) [ ]
- ------------------ -------------------------------------------------------------
        3          SEC USE ONLY
- ------------------ -------------------------------------------------------------
        4          SOURCE OF FUNDS:                            OO
- ------------------ -------------------------------------------------------------
        5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                   PURSUANT TO ITEM 2(d) OR 2(e):                            [_]
- ------------------ -------------------------------------------------------------
        6          CITIZENSHIP OR PLACE OF ORGANIZATION:            Delaware
- --------------------------------------------------------------------------------
    NUMBER OF           7     SOLE VOTING POWER:                            0
      SHARES
                      ------- --------------------------------------------------
   BENEFICIALLY         8     SHARED VOTING POWER:                  3,384,600
     OWNED BY
                      ------- --------------------------------------------------
       EACH             9     SOLE DISPOSITIVE POWER:                       0
    REPORTING
                      ------- --------------------------------------------------
   PERSON WITH          10    SHARED DISPOSITIVE POWER:             3,384,600
- ------------------ -------------------------------------------------------------
       11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING
                   PERSON:                                          3,384,600
- ------------------ -------------------------------------------------------------
       12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                   CERTAIN SHARES:                                           [_]
- ------------------ -------------------------------------------------------------
       13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):    13.56%
- ------------------ -------------------------------------------------------------
       14          TYPE OF REPORTING PERSON:            CO
- ------------------ -------------------------------------------------------------




<PAGE>
- -----------------------------------           ----------------------------------
CUSIP No. 532177201                    13D               Page 3 of 22 Pages
- -----------------------------------           ----------------------------------

- ------------------ -------------------------------------------------------------
        1          NAME OF REPORTING PERSON             ISP INVESTMENTS INC.
                   S.S. OR I.R.S. IDENTIFICATION NO.
                   OF ABOVE PERSON

- ------------------ -------------------------------------------------------------
        2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:     (a) [X]
                                                                         (b) [ ]
- ------------------ -------------------------------------------------------------
        3          SEC USE ONLY
- ------------------ -------------------------------------------------------------
        4          SOURCE OF FUNDS:                            WC, OO
- ------------------ -------------------------------------------------------------
        5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                   PURSUANT TO ITEM 2(d) OR 2(e):                            [_]
- ------------------ -------------------------------------------------------------
        6          CITIZENSHIP OR PLACE OF ORGANIZATION:            Delaware
- --------------------------------------------------------------------------------
    NUMBER OF           7     SOLE VOTING POWER:              2,932,600
      SHARES
                      ------- --------------------------------------------------
   BENEFICIALLY         8     SHARED VOTING POWER:              452,000
     OWNED BY
                      ------- --------------------------------------------------
       EACH             9     SOLE DISPOSITIVE POWER:         2,932,600
    REPORTING
                      ------- --------------------------------------------------
   PERSON WITH          10    SHARED DISPOSITIVE POWER:         452,000
- ------------------ -------------------------------------------------------------
       11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING
                   PERSON:                                    3,384,600
- ------------------ -------------------------------------------------------------
       12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                   CERTAIN SHARES:                                           [_]
- ------------------ -------------------------------------------------------------
       13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):    13.56%
- ------------------ -------------------------------------------------------------
       14          TYPE OF REPORTING PERSON:            CO
- ------------------ -------------------------------------------------------------



<PAGE>
- -----------------------------------           ----------------------------------
CUSIP No. 532177201                    13D               Page 4 of 22 Pages
- -----------------------------------           ----------------------------------

- ------------------ -------------------------------------------------------------
        1          NAME OF REPORTING PERSON             ISP IRELAND
                   S.S. OR I.R.S. IDENTIFICATION NO.
                   OF ABOVE PERSON

- ------------------ -------------------------------------------------------------
        2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:     (a) [X]
                                                                         (b) [ ]
- ------------------ -------------------------------------------------------------
        3          SEC USE ONLY
- ------------------ -------------------------------------------------------------
        4          SOURCE OF FUNDS:                            WC, OO
- ------------------ -------------------------------------------------------------
        5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                   PURSUANT TO ITEM 2(d) OR 2(e):                            [_]
- ------------------ -------------------------------------------------------------
        6          CITIZENSHIP OR PLACE OF ORGANIZATION:            Ireland
- --------------------------------------------------------------------------------
    NUMBER OF           7     SOLE VOTING POWER:              452,000
      SHARES
                      ------- --------------------------------------------------
   BENEFICIALLY         8     SHARED VOTING POWER:                  0
     OWNED BY
                      ------- --------------------------------------------------
       EACH             9     SOLE DISPOSITIVE POWER:         452,000
    REPORTING
                      ------- --------------------------------------------------
   PERSON WITH          10    SHARED DISPOSITIVE POWER:             0
- ------------------ -------------------------------------------------------------
       11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING
                   PERSON:                                    452,000
- ------------------ -------------------------------------------------------------
       12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                   CERTAIN SHARES:                                           [_]
- ------------------ -------------------------------------------------------------
       13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):    1.81%
- ------------------ -------------------------------------------------------------
       14          TYPE OF REPORTING PERSON:            CO
- ------------------ -------------------------------------------------------------



<PAGE>
- -----------------------------------           ----------------------------------
CUSIP No. 532177201                    13D               Page 5 of 22 Pages
- -----------------------------------           ----------------------------------

- ------------------ -------------------------------------------------------------
        1          NAME OF REPORTING PERSON            INTERNATIONAL SPECIALTY
                   S.S. OR I.R.S. IDENTIFICATION NO.   PRODUCTS INC.
                   OF ABOVE PERSON

- ------------------ -------------------------------------------------------------
        2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:     (a) [X]
                                                                         (b) [ ]
- ------------------ -------------------------------------------------------------
        3          SEC USE ONLY
- ------------------ -------------------------------------------------------------
        4          SOURCE OF FUNDS:                            OO
- ------------------ -------------------------------------------------------------
        5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                   PURSUANT TO ITEM 2(d) OR 2(e):                            [_]
- ------------------ -------------------------------------------------------------
        6          CITIZENSHIP OR PLACE OF ORGANIZATION:            Delaware
- --------------------------------------------------------------------------------
    NUMBER OF           7     SOLE VOTING POWER:                    121,670
      SHARES
                      ------- --------------------------------------------------
   BENEFICIALLY         8     SHARED VOTING POWER:                3,384,600
     OWNED BY
                      ------- --------------------------------------------------
       EACH             9     SOLE DISPOSITIVE POWER:               121,670
    REPORTING
                      ------- --------------------------------------------------
   PERSON WITH          10    SHARED DISPOSITIVE POWER:           3,384,600
- ------------------ -------------------------------------------------------------
       11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING
                   PERSON:                                        3,506,270
- ------------------ -------------------------------------------------------------
       12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                   CERTAIN SHARES:                                           [_]
- ------------------ -------------------------------------------------------------
       13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):    14.05%
- ------------------ -------------------------------------------------------------
       14          TYPE OF REPORTING PERSON:            CO
- ------------------ -------------------------------------------------------------



<PAGE>
- -----------------------------------           ----------------------------------
CUSIP No. 532177201                    13D               Page 6 of 22 Pages
- -----------------------------------           ----------------------------------

- ------------------ -------------------------------------------------------------
        1          NAME OF REPORTING PERSON             BEAR, STEARNS & CO. INC.
                   S.S. OR I.R.S. IDENTIFICATION NO.
                   OF ABOVE PERSON

- ------------------ -------------------------------------------------------------
        2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:     (a) [X]
                                                                         (b) [ ]
- ------------------ -------------------------------------------------------------
        3          SEC USE ONLY
- ------------------ -------------------------------------------------------------
        4          SOURCE OF FUNDS:                            WC, PF
- ------------------ -------------------------------------------------------------
        5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                   PURSUANT TO ITEM 2(d) OR 2(e):                            [_]
- ------------------ -------------------------------------------------------------
        6          CITIZENSHIP OR PLACE OF ORGANIZATION:            DELAWARE
- --------------------------------------------------------------------------------
    NUMBER OF           7     SOLE VOTING POWER:                 342,526
      SHARES
                      ------- --------------------------------------------------
   BENEFICIALLY         8     SHARED VOTING POWER:                92,000
     OWNED BY
                      ------- --------------------------------------------------
       EACH             9     SOLE DISPOSITIVE POWER:            342,526
    REPORTING
                      ------- --------------------------------------------------
   PERSON WITH          10    SHARED DISPOSITIVE POWER:           92,000
- ------------------ -------------------------------------------------------------
       11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING
                   PERSON:                                       434,526
- ------------------ -------------------------------------------------------------
       12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                   CERTAIN SHARES:                                           [_]
- ------------------ -------------------------------------------------------------
       13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):     1.74%
- ------------------ -------------------------------------------------------------
       14          TYPE OF REPORTING PERSON:            CO
- ------------------ -------------------------------------------------------------



<PAGE>
- -----------------------------------           ----------------------------------
CUSIP No. 532177201                    13D               Page 7 of 22 Pages
- -----------------------------------           ----------------------------------

- ------------------ -------------------------------------------------------------
        1          NAME OF REPORTING PERSON             FREDERICK R. ADLER
                   S.S. OR I.R.S. IDENTIFICATION NO.    INTANGIBLE ASSET
                   OF ABOVE PERSON                      MANAGEMENT TRUST

- ------------------ -------------------------------------------------------------
        2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:     (a) [X]
                                                                         (b) [ ]
- ------------------ -------------------------------------------------------------
        3          SEC USE ONLY
- ------------------ -------------------------------------------------------------
        4          SOURCE OF FUNDS:                            PF
- ------------------ -------------------------------------------------------------
        5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                   PURSUANT TO ITEM 2(d) OR 2(e):                            [_]
- ------------------ -------------------------------------------------------------
        6          CITIZENSHIP OR PLACE OF ORGANIZATION:            NEW YORK
- --------------------------------------------------------------------------------
    NUMBER OF           7     SOLE VOTING POWER:                    713,395
      SHARES
                      ------- --------------------------------------------------
   BENEFICIALLY         8     SHARED VOTING POWER:                        0
     OWNED BY
                      ------- --------------------------------------------------
       EACH             9     SOLE DISPOSITIVE POWER:               713,395
    REPORTING
                      ------- --------------------------------------------------
   PERSON WITH          10    SHARED DISPOSITIVE POWER:                   0
- ------------------ -------------------------------------------------------------
       11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING
                   PERSON:                                          713,395
- ------------------ -------------------------------------------------------------
       12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                   CERTAIN SHARES:                                           [_]
- ------------------ -------------------------------------------------------------
       13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):     2.86%
- ------------------ -------------------------------------------------------------
       14          TYPE OF REPORTING PERSON:            OO
- ------------------ -------------------------------------------------------------

<PAGE>
- -----------------------------------           ----------------------------------
CUSIP No. 532177201                    13D               Page 8 of 22 Pages
- -----------------------------------           ----------------------------------

- ------------------ -------------------------------------------------------------
        1          NAME OF REPORTING PERSON           THE COHEN REVOCABLE TRUST
                   S.S. OR I.R.S. IDENTIFICATION NO.
                   OF ABOVE PERSON

- ------------------ -------------------------------------------------------------
        2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:     (a) [X]
                                                                         (b) [ ]
- ------------------ -------------------------------------------------------------
        3          SEC USE ONLY
- ------------------ -------------------------------------------------------------
        4          SOURCE OF FUNDS:                            PF
- ------------------ -------------------------------------------------------------
        5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                   PURSUANT TO ITEM 2(d) OR 2(e):                            [_]
- ------------------ -------------------------------------------------------------
        6          CITIZENSHIP OR PLACE OF ORGANIZATION:            California
- --------------------------------------------------------------------------------
    NUMBER OF           7     SOLE VOTING POWER:               397,100
      SHARES
                      ------- --------------------------------------------------
   BENEFICIALLY         8     SHARED VOTING POWER:                   0
     OWNED BY
                      ------- --------------------------------------------------
       EACH             9     SOLE DISPOSITIVE POWER:          397,100
    REPORTING
                      ------- --------------------------------------------------
   PERSON WITH          10    SHARED DISPOSITIVE POWER:              0
- ------------------ -------------------------------------------------------------
       11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING
                   PERSON:                                     397,100
- ------------------ -------------------------------------------------------------
       12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                   CERTAIN SHARES:                                           [_]
- ------------------ -------------------------------------------------------------
       13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):    1.59%
- ------------------ -------------------------------------------------------------
       14          TYPE OF REPORTING PERSON:            OO
- ------------------ -------------------------------------------------------------



<PAGE>
- -----------------------------------           ----------------------------------
CUSIP No. 532177201                    13D               Page 9 of 22 Pages
- -----------------------------------           ----------------------------------

- ------------------ -------------------------------------------------------------
        1          NAME OF REPORTING PERSON             A. CHANG
                   S.S. OR I.R.S. IDENTIFICATION NO.
                   OF ABOVE PERSON

- ------------------ -------------------------------------------------------------
        2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:     (a) [X]
                                                                         (b) [ ]
- ------------------ -------------------------------------------------------------
        3          SEC USE ONLY
- ------------------ -------------------------------------------------------------
        4          SOURCE OF FUNDS:                            PF
- ------------------ -------------------------------------------------------------
        5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                   PURSUANT TO ITEM 2(d) OR 2(e):                            [_]
- ------------------ -------------------------------------------------------------
        6          CITIZENSHIP OR PLACE OF ORGANIZATION:            USA
- --------------------------------------------------------------------------------
    NUMBER OF           7     SOLE VOTING POWER:              135,500
      SHARES
                      ------- --------------------------------------------------
   BENEFICIALLY         8     SHARED VOTING POWER:                  0
     OWNED BY
                      ------- --------------------------------------------------
       EACH             9     SOLE DISPOSITIVE POWER:         135,500
    REPORTING
                      ------- --------------------------------------------------
   PERSON WITH          10    SHARED DISPOSITIVE POWER:             0
- ------------------ -------------------------------------------------------------
       11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING
                   PERSON:                                    135,500
- ------------------ -------------------------------------------------------------
       12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                   CERTAIN SHARES:                                           [_]
- ------------------ -------------------------------------------------------------
       13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):     0.54%
- ------------------ -------------------------------------------------------------
       14          TYPE OF REPORTING PERSON:            IN
- ------------------ -------------------------------------------------------------




<PAGE>
- -----------------------------------           ----------------------------------
CUSIP No. 532177201                    13D               Page 10 of 22 Pages
- -----------------------------------           ----------------------------------

- ------------------ -------------------------------------------------------------
        1          NAME OF REPORTING PERSON            YORK CAPITAL MANAGEMENT,
                   S.S. OR I.R.S. IDENTIFICATION NO.     L.P.
                   OF ABOVE PERSON

- ------------------ -------------------------------------------------------------
        2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:     (a) [X]
                                                                         (b) [ ]
- ------------------ -------------------------------------------------------------
        3          SEC USE ONLY
- ------------------ -------------------------------------------------------------
        4          SOURCE OF FUNDS:                            WC
- ------------------ -------------------------------------------------------------
        5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                   PURSUANT TO ITEM 2(d) OR 2(e):                            [_]
- ------------------ -------------------------------------------------------------
        6          CITIZENSHIP OR PLACE OF ORGANIZATION:            Delaware
- --------------------------------------------------------------------------------
    NUMBER OF           7     SOLE VOTING POWER:              78,700
      SHARES
                      ------- --------------------------------------------------
   BENEFICIALLY         8     SHARED VOTING POWER:                 0
     OWNED BY
                      ------- --------------------------------------------------
       EACH             9     SOLE DISPOSITIVE POWER:         78,700
    REPORTING
                      ------- --------------------------------------------------
   PERSON WITH          10    SHARED DISPOSITIVE POWER:            0
- ------------------ -------------------------------------------------------------
       11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING
                   PERSON:                                    78,700
- ------------------ -------------------------------------------------------------
       12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                   CERTAIN SHARES:                                           [_]
- ------------------ -------------------------------------------------------------
       13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):     0.32%
- ------------------ -------------------------------------------------------------
       14          TYPE OF REPORTING PERSON:            PN
- ------------------ -------------------------------------------------------------



<PAGE>
- -----------------------------------           ----------------------------------
CUSIP No. 532177201                    13D               Page 11 of 22 Pages
- -----------------------------------           ----------------------------------

- ------------------ -------------------------------------------------------------
        1          NAME OF REPORTING PERSON             DINAN MANAGEMENT, L.L.C.
                   S.S. OR I.R.S. IDENTIFICATION NO.
                   OF ABOVE PERSON

- ------------------ -------------------------------------------------------------
        2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:     (a) [X]
                                                                         (b) [ ]
- ------------------ -------------------------------------------------------------
        3          SEC USE ONLY
- ------------------ -------------------------------------------------------------
        4          SOURCE OF FUNDS:                            WC
- ------------------ -------------------------------------------------------------
        5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                   PURSUANT TO ITEM 2(d) OR 2(e):                            [_]
- ------------------ -------------------------------------------------------------
        6          CITIZENSHIP OR PLACE OF ORGANIZATION:            New York
- --------------------------------------------------------------------------------
    NUMBER OF           7     SOLE VOTING POWER:                    0
      SHARES
                      ------- --------------------------------------------------
   BENEFICIALLY         8     SHARED VOTING POWER:             78,700
     OWNED BY
                      ------- --------------------------------------------------
       EACH             9     SOLE DISPOSITIVE POWER:               0
    REPORTING
                      ------- --------------------------------------------------
   PERSON WITH          10    SHARED DISPOSITIVE POWER:        78,700
- ------------------ -------------------------------------------------------------
       11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING
                   PERSON:                                     78,700
- ------------------ -------------------------------------------------------------
       12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                   CERTAIN SHARES:                                           [_]
- ------------------ -------------------------------------------------------------
       13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):     0.32%
- ------------------ -------------------------------------------------------------
       14          TYPE OF REPORTING PERSON:            OO
- ------------------ -------------------------------------------------------------

<PAGE>
- -----------------------------------           ----------------------------------
CUSIP No. 532177201                    13D               Page 12 of 22 Pages
- -----------------------------------           ----------------------------------

- ------------------ -------------------------------------------------------------
        1          NAME OF REPORTING PERSON            JGD MANAGEMENT CORP.
                   S.S. OR I.R.S. IDENTIFICATION NO.
                   OF ABOVE PERSON

- ------------------ -------------------------------------------------------------
        2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:     (a) [X]
                                                                         (b) [ ]
- ------------------ -------------------------------------------------------------
        3          SEC USE ONLY
- ------------------ -------------------------------------------------------------
        4          SOURCE OF FUNDS:                            AF
- ------------------ -------------------------------------------------------------
        5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                   PURSUANT TO ITEM 2(d) OR 2(e):                            [_]
- ------------------ -------------------------------------------------------------
        6          CITIZENSHIP OR PLACE OF ORGANIZATION:            Delaware
- --------------------------------------------------------------------------------
    NUMBER OF           7     SOLE VOTING POWER:                 23,100
      SHARES
                      ------- --------------------------------------------------
   BENEFICIALLY         8     SHARED VOTING POWER:                    0
     OWNED BY
                      ------- --------------------------------------------------
       EACH             9     SOLE DISPOSITIVE POWER:            23,100
    REPORTING
                      ------- --------------------------------------------------
   PERSON WITH          10    SHARED DISPOSITIVE POWER:               0
- ------------------ -------------------------------------------------------------
       11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING
                   PERSON:                                       23,100
- ------------------ -------------------------------------------------------------
       12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                   CERTAIN SHARES:                                           [_]
- ------------------ -------------------------------------------------------------
       13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):     0.09%
- ------------------ -------------------------------------------------------------
       14          TYPE OF REPORTING PERSON:            CO
- ------------------ -------------------------------------------------------------


<PAGE>
- -----------------------------------           ----------------------------------
CUSIP No. 532177201                    13D               Page 13 of 22 Pages
- -----------------------------------           ----------------------------------

- ------------------ -------------------------------------------------------------
        1          NAME OF REPORTING PERSON             YORK INVESTMENT LIMITED
                   S.S. OR I.R.S. IDENTIFICATION NO.
                   OF ABOVE PERSON

- ------------------ -------------------------------------------------------------
        2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:     (a) [X]
                                                                         (b) [ ]
- ------------------ -------------------------------------------------------------
        3          SEC USE ONLY
- ------------------ -------------------------------------------------------------
        4          SOURCE OF FUNDS:                            WC
- ------------------ -------------------------------------------------------------
        5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                   PURSUANT TO ITEM 2(d) OR 2(e):                            [_]
- ------------------ -------------------------------------------------------------
        6          CITIZENSHIP OR PLACE OF ORGANIZATION:            Bahamas
- --------------------------------------------------------------------------------
    NUMBER OF           7     SOLE VOTING POWER:                129,600
      SHARES
                      ------- --------------------------------------------------
   BENEFICIALLY         8     SHARED VOTING POWER:                    0
     OWNED BY
                      ------- --------------------------------------------------
       EACH             9     SOLE DISPOSITIVE POWER:           129,600
    REPORTING
                      ------- --------------------------------------------------
   PERSON WITH          10    SHARED DISPOSITIVE POWER:               0
- ------------------ -------------------------------------------------------------
       11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING
                   PERSON:                                      129,600
- ------------------ -------------------------------------------------------------
       12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                   CERTAIN SHARES:                                           [_]
- ------------------ -------------------------------------------------------------
       13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):     0.52%
- ------------------ -------------------------------------------------------------
       14          TYPE OF REPORTING PERSON:            OO
- ------------------ -------------------------------------------------------------


<PAGE>
- -----------------------------------           ----------------------------------
CUSIP No. 532177201                    13D               Page 14 of 22 Pages
- -----------------------------------           ----------------------------------

- ------------------ -------------------------------------------------------------
        1          NAME OF REPORTING PERSON             DINAN MANAGEMENT
                   S.S. OR I.R.S. IDENTIFICATION NO.    CORPORATION
                   OF ABOVE PERSON

- ------------------ -------------------------------------------------------------
        2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:     (a) [X]
                                                                         (b) [ ]
- ------------------ -------------------------------------------------------------
        3          SEC USE ONLY
- ------------------ -------------------------------------------------------------
        4          SOURCE OF FUNDS:                            AF
- ------------------ -------------------------------------------------------------
        5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                   PURSUANT TO ITEM 2(d) OR 2(e):                            [_]
- ------------------ -------------------------------------------------------------
        6          CITIZENSHIP OR PLACE OF ORGANIZATION:            Delaware
- --------------------------------------------------------------------------------
    NUMBER OF           7     SOLE VOTING POWER:                    0
      SHARES
                      ------- --------------------------------------------------
   BENEFICIALLY         8     SHARED VOTING POWER:            129,600
     OWNED BY
                      ------- --------------------------------------------------
       EACH             9     SOLE DISPOSITIVE POWER:               0
    REPORTING
                      ------- --------------------------------------------------
   PERSON WITH          10    SHARED DISPOSITIVE POWER:       129,600
- ------------------ -------------------------------------------------------------
       11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING
                   PERSON:                                    129,600
- ------------------ -------------------------------------------------------------
       12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                   CERTAIN SHARES:                                           [_]
- ------------------ -------------------------------------------------------------
       13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):     0.52%
- ------------------ -------------------------------------------------------------
       14          TYPE OF REPORTING PERSON:            CO
- ------------------ -------------------------------------------------------------


<PAGE>
- -----------------------------------           ----------------------------------
CUSIP No. 532177201                    13D               Page 15 of 22 Pages
- -----------------------------------           ----------------------------------

- ------------------ -------------------------------------------------------------
        1          NAME OF REPORTING PERSON             JAMES G. DINAN
                   S.S. OR I.R.S. IDENTIFICATION NO.
                   OF ABOVE PERSON

- ------------------ -------------------------------------------------------------
        2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:     (a) [X]
                                                                         (b) [ ]
- ------------------ -------------------------------------------------------------
        3          SEC USE ONLY
- ------------------ -------------------------------------------------------------
        4          SOURCE OF FUNDS:                            AF
- ------------------ -------------------------------------------------------------
        5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                   PURSUANT TO ITEM 2(d) OR 2(e):                            [_]
- ------------------ -------------------------------------------------------------
        6          CITIZENSHIP OR PLACE OF ORGANIZATION:            USA
- --------------------------------------------------------------------------------
    NUMBER OF           7     SOLE VOTING POWER:                      0
      SHARES
                      ------- --------------------------------------------------
   BENEFICIALLY         8     SHARED VOTING POWER:              231,400
     OWNED BY
                      ------- --------------------------------------------------
       EACH             9     SOLE DISPOSITIVE POWER:                 0
    REPORTING
                      ------- --------------------------------------------------
   PERSON WITH          10    SHARED DISPOSITIVE POWER:         231,400
- ------------------ -------------------------------------------------------------
       11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING
                   PERSON:                                      231,400
- ------------------ -------------------------------------------------------------
       12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                   CERTAIN SHARES:                                           [_]
- ------------------ -------------------------------------------------------------
       13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):     0.93%
- ------------------ -------------------------------------------------------------
       14          TYPE OF REPORTING PERSON:            IN
- ------------------ -------------------------------------------------------------


<PAGE>



         This Amendment No. 7 ("Amendment No. 7") amends the Statement on
Schedule 13D (the "Schedule 13D") filed on November 20, 1998, as amended by
Amendment No. 1 filed on November 30, 1998 ("Amendment No. 1"), Amendment No. 2
filed on December 2, 1998 ("Amendment No. 2"), Amendment No. 3 filed on December
21, 1998 ("Amendment No. 3"), Amendment No. 4 filed on December 24, 1998
("Amendment No. 4"), Amendment No. 5 filed on May 11, 1999 ("Amendment No. 5"),
and Amendment No. 6 filed on December 6, 1999 ("Amendment No. 6"), by and on
behalf of ISP Opco Holdings Inc. ("ISP Opco"), ISP Investments Inc. ("ISP
Investments"), International Specialty Products Inc. ("ISP"), ISP Ireland ("ISP
Ireland" and, together with ISP Opco, ISP Investments and ISP, the "ISP Group"),
Bear, Stearns & Co. Inc. ("Bear, Stearns"), Frederick R. Adler Intangible Asset
Management Trust (the "Adler Trust"), The Cohen Revocable Trust (the "Cohen
Trust"), A. Chang ("Chang"), York Capital Management, L.P. ("York Capital"),
Dinan Management, L.L.C. ("Dinan Management"), JGD Management Corp. ("JGD
Management"), York Investment Limited ("York Investment"), Dinan Management
Corporation ("DMC") and James G. Dinan ("JGD") (collectively, the "Reporting
Persons") with respect to their ownership of common stock, par value $.01 per
share (the "Common Stock"), of Life Technologies, Inc. (the "Company"). As
indicated in Item 6, as of January 1, 2000, Idoya Partners ("Idoya"), Prescott
Associates ("Prescott"), Prescott International Partners, L.P. ("Prescott
International"), Thomas W. Smith as Trustee for the Jack McKenzie Trust Under
Agreement Dated April 12, 1992 (the "McKenzie Trust"), Thomas W. Smith as
Trustee for the Leo Carroll Wolfensohn Trust Under Agreement Dated March 9, 1994
(the "Wolfensohn Trust"), Thomas W. Smith ("Smith") and Thomas N. Tryforos
("Tryforos" and, together with Idoya, Prescott, Prescott International, the
McKenzie Trust, the Wolfensohn Trust and Smith, the "Prescott Entities") are no
longer subject to the restrictions contained in the Prescott Group Agreement (as
defined in Item 6 below).

ITEM 5. INTEREST IN SECURITIES OF THE ISSUER

         As of the close of business on December 31, 1999, the Reporting Persons
beneficially owned (or are deemed, solely for purposes of Rule 13d-3, to
beneficially own), directly or indirectly, an aggregate of 5,418,191 Shares,
representing approximately 21.71% of the Common Stock outstanding (based on
24,957,556 shares of Common Stock believed by the Reporting Persons to be
outstanding as of November 2, 1999).

         Bear, Stearns has the sole power to vote, direct the voting of, dispose
of and direct the disposition of 342,526 Shares. Bear, Stearns has shared power
to vote, direct the voting of, dispose of and direct the disposition of 92,000
Shares held in discretionary accounts. Of the 434,526 Shares beneficially owned
by Bear, Stearns, only 300,000 Shares that are owned by Bear, Stearns are
subject to the letter agreement, dated as of November 25, 1998 (as amended,
modified, supplemented, renewed or extended to the date hereof, the "Bear
Stearns Group Agreement"), between Bear, Stearns and certain of the Reporting
Persons. The remaining 42,526 Shares owned by Bear, Stearns are held in its
market-making account and are not subject to the Bear Stearns Group Agreement.
The 92,000 Shares beneficially owned by Bear, Stearns in discretionary accounts
are also not subject to the Bear Stearns Group Agreement.

         Since the filing of Amendment No. 6, the Reporting Persons effected
transactions in Shares in open market transactions as set forth in Schedule A
hereto.


                                       16
<PAGE>


ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
        SECURITIES OF THE ISSUER

         As disclosed in Amendment No. 6, the Prescott Entities were not party
to the Extension Agreement. Accordingly, as of January 1, 2000, the Shares
beneficially owned by the Prescott Entities are no longer subject to the
provisions of the letter agreement, dated as of December 18, 1998 (as extended
on May 10, 1998, the "Prescott Group Agreement"), among the Prescott Entities
and certain of the Reporting Persons relating to (i) selling or otherwise
disposing of any Shares and (ii) entering into any other contract, arrangement,
understanding or relationship with any other persons with respect to equity
securities of the Company.

         Except as set forth above, the response of the Reporting Persons to
this Item 6 as previously disclosed in the Schedule 13D, as previously amended,
has not changed.

             [The remainder of this page intentionally left blank.]



<PAGE>


                                   SIGNATURES

         After reasonable inquiry and to the best of their knowledge and belief,
the undersigned certify that the information set forth in this Statement is
true, complete and correct.

Dated: January 3, 2000

                               ISP OPCO HOLDINGS INC.
                               ISP INVESTMENTS INC.
                               INTERNATIONAL SPECIALTY PRODUCTS INC.

                               By:  /s/ Susan B. Yoss
                                    --------------------------------------------
                                    Susan B. Yoss
                                    Vice President and Treasurer


                               ISP IRELAND

                               By:  /s/ Ueli Marty
                                    --------------------------------------------
                                    Ueli Marty
                                    Director


                               BEAR, STEARNS & CO. INC.

                               By:  /s/ Barry Cohen
                                    --------------------------------------------
                                    Barry Cohen
                                    Senior Managing Director


                               YORK CAPITAL MANAGEMENT, L.P.

                               By: DINAN MANAGEMENT, L.L.C., its General Partner

                                    By: /s/ James G. Dinan
                                        ----------------------------------------
                                        James G. Dinan
                                        President


                               DINAN MANAGEMENT, L.L.C.

                               By:  /s/ James G. Dinan
                                    --------------------------------------------
                                    James G. Dinan
                                    President



<PAGE>
                               JGD MANAGEMENT CORP.
                               DINAN MANAGEMENT CORPORATION

                               By:  /s/ James G. Dinan
                                    --------------------------------------------
                                    James G. Dinan
                                    President


                               YORK INVESTMENT LIMITED

                               By:  /s/ Anthony L.M. Inder Reiden
                                    --------------------------------------------
                                    Anthony L.M. Inder Reiden
                                    Director


                               /s/ James G. Dinan
                               -------------------------------------------------
                               James G. Dinan


                               FREDERICK R. ADLER INTANGIBLE ASSET
                               MANAGEMENT TRUST

                               By:  /s/ Susan R. Chapman
                                    --------------------------------------------
                                    Susan R. Chapman
                                    Trustee


                               THE COHEN REVOCABLE TRUST

                               By:  /s/ S. Cohen
                                    --------------------------------------------
                                    S. Cohen
                                    Trustee


                               /s/ A. Chang
                               -------------------------------------------------
                               A. Chang

<PAGE>


                                   SCHEDULE A



         The following schedule sets forth information with respect to each
purchase of Shares which was effectuated by the Reporting Persons since the
filing of Amendment No. 6. All transactions were effectuated in the open market
through a broker.

                       ISP OPCO HOLDINGS INC.
                       ----------------------

                             Number of
   Date               Shares Purchased (Sold)                   Price Per Share
   ----               -----------------------                   ---------------

                                  None


             ISP INVESTMENTS INC. (directly and through
                   ISP Investment Grantor Trust)
             ------------------------------------------

                             Number of
   Date               Shares Purchased (Sold)                   Price Per Share
   ----               -----------------------                   ---------------

                                  None


               INTERNATIONAL SPECIALTY PRODUCTS INC.
               -------------------------------------

                             Number of
   Date               Shares Purchased (Sold)                   Price Per Share
   ----               -----------------------                   ---------------

                                  None


                            ISP IRELAND
                            -----------

                             Number of
   Date               Shares Purchased (Sold)                   Price Per Share
   ----               -----------------------                   ---------------

                                  None


                      BEAR, STEARNS & CO. INC.
                      ------------------------

                             Number of
   Date               Shares Purchased (Sold)                   Price Per Share
   ----               -----------------------                   ---------------

 12/28/99                         (225)                            42


<PAGE>
               FREDERICK R. ADLER INTANGIBLE ASSET MANAGEMENT TRUST
               ----------------------------------------------------

                                Number of
   Date                  Shares Purchased (Sold)                Price Per Share
   ----                  -----------------------                ---------------

                                     None


                        THE COHEN REVOCABLE TRUST
                        -------------------------

                                Number of
   Date                  Shares Purchased (Sold)                Price Per Share
   ----                  -----------------------                ---------------

                                     None


                                 A. CHANG
                                 --------

                                Number of
   Date                  Shares Purchased (Sold)                Price Per Share
   ----                  -----------------------                ---------------

                                     None


                      YORK CAPITAL MANAGEMENT, L.P.
                      -----------------------------

                                Number of
   Date                  Shares Purchased (Sold)                Price Per Share
   ----                  -----------------------                ---------------

                                     None


                         DINAN MANAGEMENT, L.L.C.
                         ------------------------

                                Number of
   Date                  Shares Purchased (Sold)                Price Per Share
   ----                  -----------------------                ---------------

                                     None


                         YORK INVESTMENT LIMITED
                         -----------------------

                                Number of
   Date                  Shares Purchased (Sold)                Price Per Share
   ----                  -----------------------                ---------------

                                     None



                           JGD MANAGEMENT CORP.
                           --------------------

                                Number of
   Date                  Shares Purchased (Sold)                Price Per Share
   ----                  -----------------------                ---------------

                                     None


                       DINAN MANAGEMENT CORPORATION
                       ----------------------------

                                Number of
   Date                  Shares Purchased (Sold)                Price Per Share
   ----                  -----------------------                ---------------

                                     None


                              JAMES G. DINAN
                              --------------

                                Number of
   Date                  Shares Purchased (Sold)                Price Per Share
   ----                  -----------------------                ---------------

                                     None


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