certain strains of staphylococcus aureus produce a toxin which cause epidermal exfoliation within 18 hours after direct subcutaneous or intraperitoneal injection into newborn mice. the extracellular product responsible for exfoliation is termed exfoliative toxin (et). in the present studies a modified assay system has been developed for detection of exfoliativeactivity in toxin negative strains...

77 Infection by the Gram-negative bacterium Bordetella pertussis can lead to the development of pertussis, also known as whooping cough due to the characteristic sound infected infants make following a severe coughing fit. Infection by B. pertussis is fairly common, but it rarely causes serious complications in adults. However, the infection can be fatal in infants and young children if left un...

The crystal structure of neurotoxin a from the venom of Philippines sea snake Laticauda semifasciata has been determined at 2.5 A resolution by x-ray diffraction. Comparison with the structure of neurotoxin b from the same source indicates that the two toxins differ only by substitution at His 26. Earlier chemical work had suggested a difference in chain length and considerable differences in a...

The field of corrective dermatology has gained remarkable development in the past two decades. New heights in techniques and the growing interest in rejuvenation procedures have resulted in an increase in the number of corrective procedures all over the world. Here we present the most frequently performed corrective procedures in dermatology today: lasers, intense pulsed light, fillers, botulin...

Mycotoxins are secondary metabolites produced by fungi, which may be present on a variety of crops. They are considered a major issue worldwide because of their harmful effects on animals. These contaminants lead to great economic losses, especially in pig and poultry husbandry. Over 400 mycotoxins have been identifi ed. However, only few of them have a signifi cant toxic effect and are of majo...

Cholera toxin subunit B (CTB) is the nontoxic portion of cholera toxin. Its affinity to the monosialotetrahexosylganglioside (GM1) that is broadly distributed in a variety of cell types including epithelial cells of the gut and antigen presenting cells, macrophages, dendritic cells, and B cells, allows its optimal access to the immune system. CTB can easily be expressed on its own in a variety ...

Irradiation of mixtures of diphtheria toxin fragment A and [carbonyl-14C]NAD with UV light (253.7 nm) is known to induce efficient transfer of the radiolabel to position 148, corresponding to glutamic acid in the unmodified protein. Here we report the structure of the photoproduct at position 148, as determined by chemical and photochemical methods, fast-atom-bombardment mass spectrometry, and ...

As global climate change continues and the vegetation period lengthens, importance of research into cyanobacterial recruitment biomass associated toxin risks is growing. While most studies focus on planktonic cyanobacteria causing blooms, benthic have been less explored. This study reports for first time mass proliferation epilithic macrocolonies cyanobacteria, Gloeotrichia cf. natans, in water...

The method of Garra and Baygorria, for localized antibody production, has been adapted for obtaining high-titered and monospecific antibodies against the murine toxin of Yersinia pestis. A hollow, perforated plastic golf ball surgically implanted under the skin of rabbits induced the formation of a granuloma. When the murine toxin of Y. pestis was injected directly into the granulomatous cavity...