SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 25049 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 17)* MISONIX, INC. (Name of Issuer) Common Stock, par value $.01 per share (Title of Class of Securities) 604871103 (CUSIP Number) Mr. Gary Gelman c/o American Claims Evaluation, Inc. One Jericho Plaza Jericho, New York 11753 (516) 938-8000 (Name, Address and Telephone Number of Person Authorized to Received Notices and Communications) August 5, 2005 (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-1(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 Rule 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 purpose of Section 18 of the Securities Exchange Act of 1934 ("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). SCHEDULE 13D CUSIP No. 604871103 1) NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Gary Gelman 2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) (b) 3) SEC USE ONLY (SEE INSTRUCTIONS) 4) SOURCE OF FUNDS 5) CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) 6) CITIZENSHIP OR PLACE OF ORGANIZATION USA NUMBER OF 7) SOLE VOTING POWER SHARES 549,650 BENEFICIALLY 8) SHARED VOTING POWER OWNED BY 0 EACH 9) SOLE DISPOSITIVE POWER REPORTING 549,650 PERSON WITH 10) SHARED DISPOSITIVE POWER 0 11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 549,650 12) CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) 13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 8.1% 14) TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) IN 2 Gary Gelman hereby amends and supplements the Schedule 13D originally filed with the Securities and Exchange Commission (the "SEC") on December 1, 1994, as amended by Amendment No.1 filed with the SEC on December 8, 1994, by Amendment No. 2 filed with the SEC on December 22, 1994, by Amendment No. 3 filed with the SEC on April 6, 1995, by Amendment No. 4 filed with the SEC on June 26, 1995, by Amendment No. 5 filed with the SEC on March 27, 1996, by Amendment No. 6 filed with the SEC on February 18, 1997, by Amendment No. 7 filed with the SEC on August 27, 1997, by Amendment No. 8 filed with the SEC on September 12, 1997, by Amendment No. 9 filed with the SEC on February 19, 1998, by Amendment No. 10 filed with the SEC on September 23, 1998, by Amendment No. 11 filed with the SEC on March 20, 2000, by Amendment No. 12 filed with the SEC on November 8, 2000, by Amendment No. 13 filed with the SEC on December 13, 2000, by Amendment No. 14 filed with the SEC on November 7, 2002, by Amendment No. 15 filed with the SEC on November 30, 2004, and further amended by Amendment No. 16 filed with the SEC on January 25, 2005 (the "Schedule"). This Schedule relates to the common stock, par value $.01 per share (the "Common Stock"), of MISONIX, INC., a New York corporation (the "Company"). Item 5. Interest in Securities of the Issuer. ------------------------------------ Item 5(a) of the Schedule is hereby amended by deleting the existing text and inserting the following text in its stead: "Mr. Gelman beneficially owns (as defined by Rule 13d-3 under the Securities Exchange Act of 1934, as amended) 549,650 shares of Common Stock, or 8.1% of the outstanding shares of Common Stock as of May 2, 2005 according to the Company's public filings." Item 5(c) of the Schedule is hereby amended by deleting the existing text and inserting the following text in its stead: "From March 4, 2005 through June 3, 2005, Mr. Gelman sold an aggregate of 34,900 shares of Common Stock in open market transactions at prices ranging from $4.4950 to $6.82. Other than as described below, there were no transactions in the Company's Common Stock effected by Mr. Gelman during the past sixty days. All of the transactions set forth below were effected by the sale by Mr. Gelman of such shares of Common Stock in open market transactions. 3 Trade Date No. of Shares Price Per Share ---------- ------------- --------------- June 13, 2005 10,000 $6.4050 June 29, 2005 2,000 $6.1200 July 22, 2005 8,000 $6.2100 July 25, 2005 4,084 $6.4900 July 26, 2005 2,416 $6.5500 August 2, 2005 3,500 $6.5800 August 5, 2005 14,700 $7.3900 August 8, 2005 17,000 $7.4000 August 9, 2005 16,500 $7.6000 August 10, 2005 8,000 $8.0500" 4 Signature. After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date: August 12, 2005 /s/ Gary Gelman ---------------- Gary Gelman