A method for testing for the presence of bacteria in the field includes using a mixer and frother or a reagent to disrupt bacteria cells. A sample is collected from a source suspected to be contaminated by bacteria. A mixer and frother or similar mixer is used to mix the sample, or a reagent is added to the sample, to form an elute by disrupting bacteria cells present in the sample to expose bacteria enzymes. A reagent pad is immersed in the elute and then withdrawn from the elute, or a drop of the elute is deposited on a reagent pad. After a waiting period, the reagent pad is observed to determine if the bacteria is present in or on the source. The source may be a body of water, produce, prepared food, a food preparation area, or food processing equipment. The reagent is generally a lysis reagent.
GLYCOSYLTRANSFERASE REVERSIBILITY FOR SUGAR NUCLEOTIDE SYNTHESIS AND MICROSCALE SCANNING
申请人:Thorson Jon S.
公开号:US20130004979A1
公开(公告)日:2013-01-03
The present invention generally relates to materials and methods for exploiting glycosyltransferase reversibility for nucleotide diphosphate (NDP) sugar synthesis. The present invention provides engineered glycosyltransferase enzymes characterized by improved reaction reversibility and expanded sugar donor specificity as compared to corresponding non-mutated glycosyltransferase enzymes. Such reagents provide advantageous routes to NDP sugars for subsequent use in a variety of biomedical applications, including enzymatic and chemo-enzymatic glycorandomization.
Compounds useful as substrates for β-galactosidase have the general formula
wherein X is halogen, nitro or hydrogen; Y is halogen, lower alkyl or hydrogen; W is lower alkyl or hydrogen; and Z is nitro or the aromatic ring structure
wherein a is lower alkyl or hydrogen; b is halogen or hydrogen; c is lower alkyl or hydrogen; and d is SO₃Na; with the proviso that X is not nitro when Y is hydrogen.
可用作 β-半乳糖苷酶底物的化合物具有通式,其中 X 是卤素、硝基或氢;Y 是卤素、低级烷基或氢;W 是低级烷基或氢;Z 是硝基或芳香环结构,其中 a 是低级烷基或氢;b 是卤素或氢;c 是低级烷基或氢;d 是 SO₃Na;但当 Y 是氢时,X 不是硝基。
Verfahren zur Erhöhung der enzymatischen Reaktivität von Beta-Galactosidase
申请人:BOEHRINGER MANNHEIM GMBH
公开号:EP0428137A1
公开(公告)日:1991-05-22
Zur Erhöhung der enzymatischen Reaktivität von β-Galactosidase setzt man dem Reaktionsgemisch ein Azid, Rhodanid, Cyanat und/oder Thiosulfat zu.