Document:

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                                                                   Exhibit 10.10

November 4, 2002

Mr. Gene Davis
Murdock Communications Corporation
701 Tama Street
Marion, Iowa 52302

RE: Investment Banking Fees

Dear Mr. Davis:

Pursuant to discussions with Murdock Communications Corporation's ("Murdock's")
attorney, this letter is a follow up to recent Board of Directors meetings. At
those meetings, Murdock agreed that it would pay to Berthel Fisher & Company
Financial Services, Inc. ("Berthel Fisher"), the current and past due investment
banking fees and any investment banking fees which are yet to be earned,
including but not limited to any merger fees to be earned at the Merger Closing
between Polar Molecular Corporation ("Polar") and Murdock (the "Investment
Banking Fees"), in the following manner.

     (1)  Murdock agrees to pay to Berthel Fisher, one half of all the funds
          Murdock receives from the proceeds of the Polar Molecular Corporation
          ("Polar") Additional Offering (the "Additional Offering"), which is
          currently taking place as said funds are received by Murdock, so long
          as Murdock retains sufficient funds to reasonably operate during such
          time period.

     (2)  In the event that all Investment Banking Fees due to Berthel Fisher
          are not paid out of the Additional Offering funds due to Murdock,
          Murdock will pay to Berthel Fisher one half of any funds received as a
          result of the exercise of Murdock options and/or warrants or Polar
          options and/or warrants as said funds are received by Murdock, so long
          as Murdock retains sufficient funds to reasonably operate during such
          time period.

     (3)  In the event that all Investment Banking fees due to Berthel Fisher
          are not paid as the result of (1) or (2) above, then Murdock agrees to
          issue to Berthel Fisher, at the time of the Merger Closing between
          Polar and Murdock, shares of Murdock common stock at a price of One
          Dollar per share, in a number of shares equal to the remaining amount
          of Investment Banking Fees outstanding divided by one

Please acknowledge below, your agreement with the terms of this letter.

Very truly yours,
Berthel Fisher & Company Financial Services, Inc.

/s/ Thomas J. Berthel
-------------------------
    Thomas J. Berthel
    CEO

<PAGE>

                                 ACKNOWLEDGEMENT

I, Gene Davis, CEO of Murdock Communications Corporation and on behalf of said
corporation, acknowledge that I understand and agree to the terms of the
attached letter

/s/ Gene Davis
-------------------------
By: Gene Davis
Title: CEO<PAGE>

                    [Letterhead of Arenson & Zimmerman, PLC]

                                 January 3, 2003

Mr. Eugene Davis, CEO
Pirinate Consulting Group, L.L.C.
5 Canoe Brook Drive
Livingston, NJ 07039

RE: LETTER AGREEMENT: FIRST AMENDMENT TO COMPENSATION AGREEMENT, EFFECTIVE DATE
    AUGUST 1, 2002

Dear Mr. Davis:

       Reference is made to the above-mentioned Compensation Agreement,
effective August 1, 2002 (the "Compensation Agreement"), between Murdock
Communications Corporation ("MCC") and Pirinate Consulting Group, L.L.C.
("Pirinate").

       We have discussed certain amendments to the Compensation Agreement
necessary to facilitate MCC's proposed merger transaction with Polar Molecular
Corporation. This letter agreement shall memorialize, constitute, and serve as
the First Amendment to the Compensation Agreement. The Parties to the
Compensation Agreement hereby agree to the following amendments to the
Compensation Agreement::

            1.    Section 4.B. of the Compensation Agreement is hereby amended
to read in its entirety as follows:

                  B.    Four Thousand (4,000) shares of MCC common stock per
month shall accrue for the benefit of Pirinate, and shall be earned and
transferred to Pirinate at the effective time of the proposed merger transaction
between MCC and Polar Molecular Corporation (the "Effective Time"), which stock
shall be registered, and freely tradable without restriction, at the Effective
Time; and

            2.    Section 4.C. of the Compensation Agreement is hereby deleted
in its entirety.

       All remaining provisions of the Compensation Agreement remain unchanged
and in full force and effect.

<PAGE>

       Please acknowledge below, that you are in complete agreement with the
terms of this letter, and return an executed copy by facsimile and then by
overnight delivery directly to Ms. Nancy Davis at MCC for execution by Mr. Wayne
Wright.

                                              Sincerely,

                                              /s/ James H. Arenson

                                              James H. Arenson
                                              Arenson & Zimmerman, P.L.C.
                                              Counsel for Murdock Communications
                                              Corporation

ACCEPTED FOR
MURDOCK COMMUNICATIONS
CORPORATION

BY /s/ Wayne Wright
  -----------------------------------------
       Wayne Wright
       Principal Accounting Officer
       Murdock Communications Corporation

Accepted and agreed to this
23 day of January, 2003

ACCEPTED FOR
PIRINATE CONSULTING GROUP, L.L.C.

BY /s/ Eugene I. Davis
  -----------------------------------------
       Eugene I. Davis
       Managing Member

   /s/ Eugene I. Davis
  -----------------------------------------
       Eugene I. Davis
       An Individual

Accepted and agreed to this
_____ day of January, 2003<PAGE>

                                                                   Exhibit 10.22

                 AMENDMENT, MODIFICATION AND EXTENSION AGREEMENT

     This Amendment, Modification and Extension Agreement is made as of November
16, 2002, between REPUBLIC CREDIT CORPORATION I ("Republic") of Denver, Colorado
(Creditor), and MURDOCK COMMUNICATIONS CORPORATION ("MCC") of Cedar Rapids, Iowa
(Debtor) and SILENT WOMAN, L.L.C. ("SW") of Cedar Rapids, Iowa. Republic, MCC,
and SW shall collectively be referred to herein as "the Parties".

     WHEREAS, the Parties have previously entered into a Compromise, Settlement
and Mutual Release Agreement, executed by MCC and SW on June 20, 2002; and

     WHEREAS, Paragraph 7.1 CLOSING contains a deadline of midnight December 31,
2002; and

     WHEREAS, the parties wish to provide for an extension of that deadline.

     NOW, THEREFORE, in consideration of the mutual promises and covenants set
forth herein, the Parties hereby agree as follows:

     1. A copy of the Compromise, Settlement and Mutual Release Agreement is
attached hereto as Exhibit 1, and incorporated herein by this reference.

     2. This Amendment, Modification and Extension Agreement is intended to
amend and modify certain provisions of Paragraph 7.1 CLOSING, contained in
"SECTION SEVEN MISCELLANEOUS" of the Compromise, Settlement and Mutual Release
Agreement by adding the following sentence to the end of current Paragraph 7.1:

          If MCC requests any extensions of the December 31, 2002 date in the
          previous sentence, then Republic shall grant to MCC up to three (3)
          additional one-month extensions on the following basis: Each one-month
          extension shall be granted to MCC provided that Republic has received
          $10,000.00 in good and available funds prior to the first day of the
          month for each such extension. Republic shall not extend the
          expiration date beyond March 31, 2003.

<PAGE>

          Republic's wiring instructions are as follows:

<PAGE>

          Wells Fargo Bank West, NA
          ABA:  102000076
          Account Number:  1448019867
          For further credit to:  Republic Credit Corporation I
          Reference:  Murdock Communications Corp/000-0875-03/RCCI

     3. The Parties agree that this Amendment, Modification and Extension
Agreement complies with Paragraph 7.2 of the Compromise, Settlement and Mutual
Release Agreement, (see Exhibit 1).

     4. The Parties further agree that the Compromise, Settlement and Mutual
Release Agreement remains in full force and effect as to all other terms and
conditions contained therein, not expressly amended, modified or extended
herein.

     IN WITNESS WHEREOF, the Parties have executed this Agreement.

     REPUBLIC CREDIT CORPORATION I

     By:/s/ Robert S. Possehl
        -----------------------------------               ----------------------
            Robert S. Possehl                             Date
            Vice President

     MURDOCK COMMUNICATIONS CORPORATION

     By:/s/ Wayne Wright
        -----------------------------------               ----------------------
            Principal Accounting Officer                  Date

     By:
        -----------------------------------               ----------------------
            Attorney for MCC                              Date

     SILENT WOMAN, L.L.C.

     By:/s/ James Arenson
        -----------------------------------               ----------------------
            James Arenson, Member                         Date<PAGE>

                                                                   Exhibit 10.23

             SECOND AMENDMENT, MODIFICATION AND EXTENSION AGREEMENT

     This Second Amendment, Modification and Extension Agreement ("Second
Amendment") is made as of January 28, 2003, among REPUBLIC CREDIT CORPORATION I
("Republic") of Denver, Colorado (Creditor), and MURDOCK COMMUNICATIONS
CORPORATION ("MCC") of Cedar Rapids, Iowa, and SILENT WOMAN, L.L.C. ("SW") of
Cedar Rapids, Iowa. Republic, MCC, and SW shall collectively be referred to
herein as "the Parties".

     WHEREAS, the Parties have previously entered into a Compromise, Settlement
and Mutual Release Agreement, ("Settlement Agreement") executed by MCC and SW on
June 20, 2002; and

     WHEREAS, Paragraph 7.1 "CLOSING" of the Settlement Agreement contains a
deadline of midnight December 31, 2002 for the Closing of the Merger; such
deadline is subject to certain extensions pursuant to an Amendment, Modification
and Extension Agreement dated as of November 16, 2002 ("First Amendment");

     WHEREAS, the Parties wish to amend the extension provisions of the First
Amendment.

     NOW, THEREFORE, in consideration of the mutual promises and covenants set
forth herein, the Parties hereby agree as follows:

     1.   A copy of the Settlement Agreement is attached hereto as Exhibit 1,
          and incorporated herein by this reference.

     2.   A copy of the First Amendment is attached hereto as Exhibit 2 and
          incorporated herein by this reference.

     3.   The last paragraph of Section 7.1 (which was added to Section 7.1 of
          the Settlement Agreement pursuant to the First Amendment) is deleted
          in its entirety and replaced with the following:

          "Debtor may seek four one-month extensions (each an "Extension") of
          the Closing of the Merger upon payment by wire transfer to Republic of
          the Extension fees set forth below (provided, however, if Debtor fails
          to seek any Extension as provided for herein, Debtor may not seek any
          further Extensions):

<PAGE>

               (a) the deadline for Closing of the Merger was extended to
               January 31, 2003, and Republic received the requisite $10,000
               extension fee for this Extension;

               (b) the deadline for Closing of the Merger shall be extended to
               February 28, 2003 upon payment of $10,000 prior to February 1,
               2003 (the "February Extension Fee");

               (c) the deadline for Closing of the Merger shall be extended to
               March 31, 2003 upon payment of $10,000 prior to March 1, 2003
               (the "March Extension Fee");

               (d) the deadline for Closing of the Merger shall be extended to
               April 30, 2003 upon payment of $10,000 prior to April 1, 2003
               (the "April Extension Fee");

               (e) Notwithstanding paragraph 3(b) above, MCC and SW may, at
               their option, elect to postpone payment of the February Extension
               Fee by giving Republic written notice of such election prior to
               January 31, 2003. If MCC and SW elect to postpone the February
               Extension Fee and the Closing of the Merger has not occurred
               during the month of February 2003, an Extension fee of $25,000.00
               shall be paid to Republic prior to the first day of March 2003,
               which payment shall constitute payment in full of the February
               Extension Fee and the March Extension Fee. If MCC and SW elect to
               postpone payment of the February Extension Fee and the Closing of
               the Merger occurs during the month of February, 2003, the
               February Extension Fee of $10, 000 shall be payable at the
               Closing of the Merger.

          If the April Extension Fee is paid and the Closing of the Merger
          occurs on or after April 1, 2003, but on or prior to April 15, 2003,
          then Republic shall rebate $5,000.00 of the April Closing Fee to MCC.

          Republic's wiring instructions are as follows:

               Wells Fargo Bank West, NA
               ABA: 102000076
               Account Number: 1448019867
               For further credit to: Republic Credit Corporation I
               Reference: Murdock Communications Corp/000-0875-03/RCCI

     4. The Parties agree that this Second Amendment complies with Paragraph 7.2

<PAGE>

Amendment of the Settlement Agreement, (see Exhibit 1).

     5. The Parties further agree that the Settlement Agreement remains in full
force and effect as to all other terms and conditions as contained therein, not
expressly amended, modified or extended herein.

     IN WITNESS WHEREOF, the Parties have executed this Second Amendment.

     REPUBLIC CREDIT CORPORATION I

     By: /s/ Robert S. Possehl                                1-27-03
         ----------------------------------                   -------------
             Robert S. Possehl                                     Date
             Vice President

     MURDOCK COMMUNICATIONS CORPORATION

     By: /s/ Wayne Wright                                     1-28-03
         ----------------------------------                   -------------
     Principal Accounting Officer                                  Date

     By: /s/ James Arenson                                    1-28-03
         ----------------------------------                   -------------
             Attorney for MCC                                      Date

     SILENT WOMAN, L.L.C.

     By: /s/ James Arenson                                    1-28-03
         ----------------------------------                   -------------
             James Arenson, Member                                 Date

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