Abstract: A detection medium including a substrate for a metabolic activity specific for a group of Gram-negative bacteria, a beta-glucosidase or cellobiosidase substrate, and a beta-glucosidase or cellobiosidase inducer. The inducer is a carbohydrate constituted of a carbohydrate linked in the ?-position to glucose, or a carbohydrate with a ?glucoside subunit, preferably selected from cellobiose, cellulose, starch, cellotriose, and trehalose.

Abstract: An enzyme substrate of formula (I) detects peptidase activity: Methods of detecting peptidase activity of a microorganism may include incubating a biological sample with the enzyme substrate of formula (I), and detecting peptidase activity if a microorganism having peptidase activity is present in the biological sample. The enzyme substrate may be included in a reaction medium.

Abstract: The present invention relates to the field of microbiological testing of food. It relates to a method for identifying bacteria of the Bacillus cereus group, comprising the steps consisting in: bringing a sample that may contain bacteria of the Bacillus cereus group, a reaction medium comprising at least one fluorescent phosphatidylcholine phospholipase C substrate and an inhibitor of Gram-negative bacteria into contact, in a container; incubating all of the above together; identifying the bacteria of the Bacillus cereus group by detecting the PC-PLC substrate hydrolysis reaction, in which the pH of the reaction medium and the time necessary for detecting the PC-PLC substrate hydrolysis reaction carried out are adapted in such a way that said hydrolysis reaction by the bacteria of the Bacillus cereus group is detected before the hydrolysis of the PC-PLC substrate by the Gram-positive bacteria other than those belonging to the Bacillus cereus group, and potentially present in the sample, is detectable.

Abstract: The present invention relates to an enzyme substrate for detecting nitroreductase activity of formula (I) below: in which X is S, NX1, O or NX1-CO; R1 is nothing or a substituent selected from Cl, CH3, Br, F, I, alkyl, aryl and carboxyl; R2 is nothing or a substituent selected from Cl, O—CH2—O, O—CH3, F, diethylenediamine-CH3, NR3R4, Br, I, alkyl, aryl, carboxyl, NO2 and R3 and R4 are independently H or an alkyl group containing from 1 to 4 carbon atoms; and X1 is selected from H, CH3, C2H4Ph, OH, alkyl and aryl.

Abstract: The invention relates to the use of a compound having formula (I) as an enzymatic substrate for the detection of a nitroreductase activity or as an enzymatic substrate for the detection of a nitroreductase activity and indicator of pH, wherein: W1, W2, W3 and W4 are independently H, Br, Cl, F, I, alkyl, alkoxy, thiomethyl, perfluoroalkyl, nitro, cyano, carboxyl (including the esters or amides thereof) or any combination of same; n=0, 1 or 2; U and V are N, N+R, CZ4, R being H, alkyl, aralkyl, aryl, alkanoic or alkylsulphonic, preferably if U is CZ4, V is N or N+R and, if V is CZ4, U is N or N+R; and Z1, Z2, Z3 and Z4 are independently H, Br, Cl, F, I, alkyl, aryl, alkoxy, perfluoroalkyl, nitro, cyano, carboxyl, sulphonyl, including the sulphonyl or carboxyl amides or esters thereof, and the salts of same.

Abstract: The present invention relates to the use of a compound of the following formula (I) for detecting a peptidase activity and/or a variation in pH: according to which: Y1 is a peptide, H or an alkyl; W1, W2, W3 and W4 are independently H, Br, Cl, F, I, alkyl, alkoxy, thiomethyl, perfluoroalkyl, nitro, cyano, carboxyl (including the esters or amides thereof) or any combination thereof; n=0, 1 or 2; X is NR, CZ5Z6, S or O, R being H, alkyl, aralkyl, aryl, alkanoyl or alkylsulfonyl, Z5 and Z6 being an alkyl; Y is N or N+R, R being alkyl, aralkyl, aryl, alkanoyl or alkylsulfonyl; Z1, Z2, Z3 and Z4 being independently H, Br, Cl, F, I, alkyl, aryl, alkoxy, perfluoroalkyl, nitro, cyano, carboxyl, sulfonyl, including the carboxyl or sulfonyl esters or amides, and salts thereof.

Abstract: The invention relates to the use of a compound having formula (I) as an enzymatic substrate for the detection of a nitroreductase activity, wherein: W1, W2, W3 and W4 are independently H, Br, Cl, F, I, alkyl, alkoxy, thiomethyl, perfluoroalkyl, nitro, cyano, carboxyl (including the esters or amides thereof) or any combination of same; n=0, 1 or 2; U is N or N+R and V is CZ6 N or N+R or V is N or N+R and U is CZ6, R being H, alkyl, aralkyl, aryl, alkanoic or alkylsulphonic; and Z1, Z2, Z3, Z4, Z5 and Z6 are independently H, Br, Cl, F, I, alkyl, aryl, alkoxy, perfluoroalkyl, nitro, cyano, carboxyl, sulphonyl, including the sulphonyl or carboxyl amides or esters thereof, and the salts of same.

Abstract: The present invention relates to the use of a compound of the following formula (I), as an enzyme substrate for the detection of a peptidase activity or as a pH indicator: according to which: Y1 is a peptide, H or an alkyl; W1, W2, W3 and W4 are independently H, Br, Cl, F, I, alkyl, alkoxy, thiomethyl, perfluoroalkyl, nitro, cyano, carboxyl (including the esters or amides thereof) or any combination thereof; n=0, 1 or 2; U is N or N+R and V is CZ6N or N+R or else V is N or N+R and U is CZ6; R is H, alkyl, aralkyl, aryl, alkanoyl or alkylsulfonyl; Z1, Z2, Z3, Z4 and Z5 are independently H, Br, Cl, F, I, alkyl, aryl, alkoxy, perfluoroalkyl, nitro, cyano, carboxyl, sulfonyl, including the carboxyl or sulfonyl esters or amides, and salts thereof.

Abstract: The invention relates to the use of a compound having formula (I) as an enzymatic substrate for the detection of a nitroreductase activity, wherein: W1, W2, W3 and W4 are independently H, Br, Cl, F, I, alkyl, alkoxy, thiomethyl, perfluoroalkyl, nitro, cyano, carboxyl (including the esters or amides thereof) or any combination of same; n=0, 1 or 2; X is NR, CZ5Z6, S or O, R being H, alkyl, aralkyl, aryl, alkanoic or alkylsulphonie, Z5 and Z6 being an alkyl; Y is N or N+R, R being alkyl, aralkyl, aryl, alkanoic or alkylsulphonic; Z1, Z2, Z3 and Z4 are independently H, Br, Cl, F, I, alkyl, aryl, alkoxy, perfluoroalkyl, nitro, cyano, carboxyl, sulphonyl, including the sulphonyl or carboxyl amides or esters thereof, and the salts of same.

Abstract: The present invention relates to the use of a compound of the following formula (I) for detecting a peptidase activity and/or a variation in pH: according to which: Y1 is a peptide, H or an alkyl; W1, W2, W3 and W4 are independently H, Br, Cl, F, I, alkyl, alkoxy, thiomethyl, perfluoroalkyl, nitro, cyano, carboxyl (including the esters or amides thereof) or any combination thereof; n=0, 1 or 2; U and V are N, N+R or CZ4, R being H, alkyl, aralkyl, aryl, alkanoyl or alkylsulfonyl; Z1, Z2, Z3 and Z4 being independently H, Br, Cl, F, I, alkyl, aryl, alkoxy, perfluoroalkyl, nitro, cyano, carboxyl, sulfonyl, including the carboxyl or sulfonyl esters or amides, and salts thereof.

Abstract: A reaction medium for the culture and/or detection and/or identification of bacteria of the Legionella genus includes at least one siliceous compound, where the siliceous compound is a nonpolar silica. A method for detecting and/or identifying bacteria of the Legionella genus, includes bringing a sample that may contain bacteria of the Legionella genus into contact with a reaction medium comprising at least one siliceous compound, incubating, and detecting the presence of bacteria of the Legionella genus.

Abstract: A reaction medium for detecting and/or identifying Methicillin-resistant Staphylococcus aureus (MRSA) bacteria, comprising a predetermined combination of two antibiotics, a first antibiotic which belongs to the cephalosporin family and a second antibiotic, said first and second antibiotics each being at a sub-inhibitory concentration.

Abstract: A reaction medium for detecting and/or identifying Staphylococcus aureus bacteria, comprising a combination of two enzymatic substrates for alpha-glucosidase.

Abstract: A specific culture medium for growth, detection, identification and/or counting of Staphylococcus aureus bacteria, said medium includes at least one fluorogenic, chromogenic or luminescent substrate of phospholipase C. Said medium permits differentiation between Staphylococcus aureus and coagulase-negative staphylococci.

Abstract: A reaction medium for characterizing Staphylococcus aureus, that includes a metabolic indicator which is a beta-ribosidase substrate in combination with at least one other metabolic indicator and/or at least one metabolic regulator. A method for detecting and/or identifying Staphylococcus aureus, including: providing a reaction medium that comprises a metabolic indicator which is a beta-ribosidase substrate in combination with at least one other metabolic indicator and/or at least one metabolic regulator; inoculating the medium with a biological sample to be tested; allowing for incubation; and characterizing the presence of Staphylococcus aureus.

Abstract: The invention relates to a method for detecting and/or identifying Clostridium difficile, characterized in that it comprises the following steps: a) providing a reaction medium comprising at least one beta-glucosidase substrate capable of identifying C. difficile, b) inoculating the medium with a biological sample to be tested, c) allowing for incubation, and d) detecting the hydrolysis of the beta-glucosidase substrate, indicative of the presence of Clostridium difficile. The invention also relates to a reaction medium for the detection and/or the identification of Clostridium difficile, that comprises at least one beta-glucosidase substrate capable of identifying C. difficile.

Abstract: The invention relates to a method for detecting and/or identifying E. coli in a urine sample, that comprises: a) inoculating the urine sample liable to contain E. coli on a detection medium that comprises a first substrate selected from a beta-glucuronidase substrate, beta-galactosidase substrate and alpha-galactosidase substrate, and a substrate for a lactose acidification enzyme, beta-ribosidase, phosphatase, L-alanine aminopeptidase and L-leucine aminopeptidase, and a second substrate, different from said first substrate and selected from a beta-glucuronidase substrate, beta-galactosidase substrate and alpha-galactosidase substrate, and a substrate for a lactose acidification enzyme, beta-ribosidase, phosphatase, L-alanine aminopeptidase and L-leucine aminopeptidase, or obtaining bacterial colonies; b) identifying the colonies that react with the first substrate and/or the second substrate as being colonies of E. coli.

Abstract: The invention concerns a medium for specific detection of Staphylococcus aureus and/or discrimination between positive-coagulase Staphylococcus and negative-coagulase enabling Staphylococcus to isolate bacteria of the genus staphylococcus and identify the Staphylococcus aureus species, which use at least an enzymatic substrate, preferably a chromogenic or fluorescent agent, and still more preferably consisting of an indoxyl or naphthol base. The invention also concerns a method for identifying, and optionally counting, Staphylococcus aureus using such a medium. It consists of a Staphylococcus aureus culture medium and at least an enzymatic substrate enabling testing of an ?-glucosidase activity. The invention is particularly applicable in the field of diagnosis.

Abstract: The present invention relates to an enzyme substrate for detecting nitroreductase activity of formula (I) below: in which X is S, NX1, O or NX1-CO; R1 is nothing or a substituent selected from Cl, CH3, Br, F, I, alkyl, aryl and carboxyl; R2 is nothing or a substituent selected from Cl, O—CH2—O, O—CH3, F, diethylenediamine-CH3, NR3R4, Br, I, alkyl, aryl, carboxyl, NO2 and R3 and R4 are independently H or an alkyl group containing from 1 to 4 carbon atoms; and X1 is selected from H, CH3, C2H4Ph, OH, alkyl and aryl.

Abstract: The present invention relates to an enzyme substrate for detecting peptidase activity in microorganisms, of formula (I) below: in which X is S; NX1; O; or NX1-CO; R1 is nothing or one of the following substituents: Cl, Br, F, I, OH, or an alkyl, aryl or carboxyl group; R2 is nothing or one of the following substituents: Cl; O—CH2—O; O—CH3; F, diethylenediamine-CH3, NR3R4, Br, I, OH, an alkyl, aryl or carboxyl group, NO2, or X1 is selected from: H, C2H4Ph, OH, an alkyl group and an aryl group; R3 and R4 are independently H or an alkyl group containing from 1 to 4 carbon atoms and P is a peptide.