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           < 2005 News Listings
Sionex Corporation Closes Series C Round of Financing

Company Continues to Expand as a Major Supplier of Chemical and Biological Sensor Systems in the
Threat Detection Markets and beyond



BEDFORD, MA
December 7, 2005

Sionex Corporation, a company focused on commercializing breakthrough chemical and biological sensors and systems, today announced the completion of a $12 million Series C round of financing. Rho Ventures and Morgenthaler Ventures led the round with additional funding from Dow Chemical Corporate Venture Capital and Navigator Technology Ventures.

Sionex has grown from a development stage company to a commercial supplier of its proprietary microDMxTM technology. Commercial products from Thermo Electron Corporation (NYSE:TMO) and Varian Inc. (Nasdaq:VARI) incorporating the Sionex microDMx technology are being sold.

The capital raised will be used to support both commercial, market and technical development efforts. In addition it will enable Sionex to provide additional support to its major customers in the homeland security, defense, environmental, diagnostics and industrial sectors.

“We are pleased that all our Series B round investors chose to re-invest in this latest round of financing,” said Wes Davis, Sionex’s President and CEO. “This is a clear validation of our technology and the progress we have made toward commercial success.”

Rho and Morgenthaler are well established and internationally respected venture capital firms who collectively have over $3.5 billion under management. The companies have strengths in semiconductors, communications, components, enterprise IT as well as expertise in life sciences and broadband communications companies.

About Rho Ventures
Rho Ventures is a New York-based venture capital firm with extensive investments in the technology, healthcare and electronic information sectors. Since it was founded in 1981, the firm has invested in numerous companies including Active Power, Capstone Turbine, Ciena Corporation, Commerce One, Compaq Computer Corporation, Diversa Corporation, Human Genome Sciences Inc., iVillage, MedImmune, Inc., NitroMed, Senomyx, Tercica, Tripod and Vicuron. Aggregate venture capital under management exceeds $1.5 billion. Additional information can be found at www.rho.com

About Morgenthaler Ventures
Morgenthaler is a leading national venture capital and management buyout firm with offices in Boston, MA; Boulder, CO; Cleveland, OH; Menlo Park, CA; and Princeton, NJ. Its venture capital team focuses on life sciences and information technology investments. Additional information about Morgenthaler can be found at www.morgenthaler.com

About Sionex Corporation
Sionex Corporation is focused on commercializing breakthrough chemical and biological sensor chips and systems based on its proprietary microDMxTM detection technology. Sionex maintains its worldwide headquarters and laboratories in Bedford, Massachusetts, close to Boston with its commercial, technology and communications infrastructure. The Company is privately held and was founded in 2001 with patented technology licensed exclusively from The Charles Stark Draper Laboratory. Additional information about Sionex Corporation is available at www.sionex.com
.
microDMxTM and Protection by DetectionTM are trademarks of Sionex Corporation.

Forward-looking Statement
Some statements in this announcement constitute forward-looking statements. Forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Sionex Corporation to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. There can be no assurance that the forward-looking statements included in this announcement will prove to be accurate. In light of the significant uncertainties inherent in the forward-looking statements included herein, the inclusion of this information should not be regarded as a representation by the Company or any other person that the objectives and plans of the Company will be achieved.



      
Copyright ©2007 Rho Capital Partners, Inc.