From owner-metabolic-reg@net.bio.net Mon Nov 25 22:00:00 1996 Path: biosci!bcm.tmc.edu!cs.utexas.edu!news.sprintlink.net!news-peer.sprintlink.net!news-stock.gsl.net!news.gsl.net!news-dc.gsl.net!news.gsl.net!news.NetVision.net.il!news From: Steven Lemore Newsgroups: bionet.metabolic-reg Subject: pH Measurement of Small Biological Samples Date: 26 Nov 1996 19:35:08 GMT Organization: NetVision LTD. Lines: 14 Message-ID: <57fgpc$ahk@news.NetVision.net.il> NNTP-Posting-Host: ts001p10.pop2a.netvision.net.il Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) The need frequently arrises in biological laboratories to measure pH in small sample vessels such as 96 well plates, microcentrifuge tubes, or NMR tubes. Standard pH electrodes are too large to fit into these small containers. Miniature glass electrodes are both breakable and have a high electrical resistance which makes the pH measurements unstable. A micro combination pH electrode has been developed which has a 1 mm tip and a 2 mm diameter flexible Teflon body which can measure pH in less less than 20 microliters of sample. This probe has a solid state sensor which gives drift free pH measurements. The probe can be used with a standard pH meter. Further information can be obtained via email at service@lazarlab.com .