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Strana 1 od 35 výsledky
Potassium-Ion-Selective Fluorescent Sensors To Detect Cereulide, the Emetic Toxin of B. cereus, in Food Samples and HeLa Cells.
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We report the development of new chemical probes for cereulide, a toxic metabolite produced by specific strains of Bacillus cereus, through displacement of potassium cations from a preformed specific complex and a subsequent change in the fluorescence emission. For this purpose, we designed
Cereulide produced by Bacillus cereus increases the fitness of the producer organism in low-potassium environments.
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Cereulide, produced by certain Bacillus cereus strains, is a lipophilic cyclic peptide of 1152 Da that binds K(+) ions with high specificity and affinity. It is toxic to humans, but its role for the producer organism is not known. We report here that cereulide operates for B. cereus to scavenge
Inhibition by potassium ion of the pregerminative response to L-alanine of unactivated spores of Bacillus cereus T.
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The effect of potassium ion on L-alanine-inosine-induced germination of unactivated spores of Bacillus cereus T was studied. Unactivated spores germinated in 0.1 M sodium phosphate buffer (NaPB), but not 0.1 M potassium phosphate buffer (KPB), at pH 8.0 and at 30 C. Inhibition of germination was
Growth of Bacillus cereus on solid media as affected by agar, sodium chloride, and potassium sorbate.
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The effect of two independent variables: microstructure, as modified by the agar content (1.0, 4.0, 7.0%), and water activity (a(w)), as modified by the NaCl content (0.5, 2.5, 4.5%), in the absence or in the presence of potassium sorbate (0.0; 2,000 ppm) on Bacillus cereus growth on solid media was
Diffusion-limited component of reactions catalyzed by Bacillus cereus beta-lactamase I.
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The Bacillus cereus beta-lactamase I catalyzes the hydrolysis of a wide variety of penicillins and cephalosporins with values of k(cat)/K(m) varying over several orders of magnitude. The values of this parameter for the most reactive of these compounds, benzylpenicillin, I, and
Effect of three preservatives on the growth of Bacillus cereus, Vero cytotoxigenic Escherichia coli and Staphylococcus aureus, on plates with gradients of pH and sodium chloride concentration.
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The effect of temperature, pH, sodium chloride concentration and a preservative (sodium benzoate, sodium nitrite or potassium sorbate) on the growth of three foodborne bacterial pathogens (Bacillus cereus, Vero cytotoxigenic Escherichia coli and Staphylococcus aureus) was studied using gradient gel
Incidence and Growth of Bacillus cereus in Retail Pumpkin Pies 1.
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Pumpkin pies were sampled and screened for presence of Bacillus cereus . Pies were obtained from a cross-section of distribution outlets including: two major chain supermarkets, an independently owned supermarket with in-store bakery and a major chain supermarket that distributes products baked at a
Influence of food matrix on inactivation of Bacillus cereus by combinations of nisin, pulsed electric field treatment, and carvacrol.
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Carvacrol was used as a third preservative factor to enhance further the synergy between nisin and pulsed electric field (PEF) treatment against vegetative cells of Bacillus cereus. When applied simultaneously with nisin (0.04 microg/ml), carvacrol (0.5 mM) enhanced the synergy found between nisin
Microincineration and elemental X-ray microanalysis of single Bacillus cereus T spores.
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Single whole spores of bacillus cereus T were analyzed by scanning electron microscopy and electron microprobe X-ray microanalysis before and after high-temperature (600 degrees C) ashing in air. High-temperature ashing consisted of a centripetal oxidation of the spore surface combined with
Stem bark extract and fraction of Persea americana (Mill.) exhibits bactericidal activities against strains of bacillus cereus associated with food poisoning.
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The study investigates the in vitro antibacterial potentials of stem bark extracts of Persea americana on strains of Bacillus cereus implicated in food poisoning. The crude stem bark extracts and butanolic fraction at a concentration of 25 mg/mL and 10 mg/mL, respectively, exhibited antibacterial
The fate of Bacillus cereus and Geobacillus stearothermophilus during alkalization of cocoa as affected by alkali concentration and use of pre-roasted nibs.
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Alkalization is a step of cocoa processing and consists of the use of alkali and high temperature to improve the sensorial and technological qualities of cocoa. Intense food processing can select spores, which can compromise safety and quality of the final product. Thus, the aim of this study was to
A novel double heme substitution produces a functional bo3 variant of the quinol oxidase aa3 of Bacillus cereus. Purification and paratial characterization.
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A novel bo3-type quinol oxidase was highly purified from Bacillus cereus PYM1, a spontaneous mutant unable to synthesize heme A and therefore spectroscopically detectable cytochromes aa3 and caa3. The purified enzyme contained 12.4 nmol of heme O and 11.5 nmol of heme B mg-1 protein. The enzyme was
Inactivation of Bacillus cereus spores in milk by mild pressure and heat treatments.
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The objective of this work was to study the germination and subsequent inactivation of Bacillus cereus spores in milk by mild hydrostatic pressure treatment. In an introductory experiment with strain LMG6910 treated at 40 degrees C for 30 min at 0, 100, 300 and 600 MPa, germination levels were 1.5
Evaluating the behavior of Staphylococcus aureus and Bacillus cereus in dairy- and non-dairy-based aqueous slurries during manufacturing of table spreads
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High moisture slurries used in production of table spreads may permit growth of Staphylococcus aureus and Bacillus cereus and subsequent production of heat stable enterotoxin. Compliance with the Food Safety Modernization Act (FSMA), specifically 21 CFR Part 117, Subpart B and Section 117.8 (c)(2)
Mechanisms of sorbate inhibition of Bacillus cereus T and Clostridium botulinum 62A spore germination.
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The mechanism by which potassium sorbate inhibits Bacillus cereus T and Clostridium botulinum 62A spore germination was investigated. Spores of B. cereus T were germinated at 35 degrees C in 0.08 M sodium-potassium phosphate buffers (pH 5.7 and 6.7) containing various germinants (L-alanine,
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