effects o f s e l ected l ow l evel doses of y - rad iation (100-400 k rad) on t he abi l ity o f toxin strain o f asperg i l l us flavus t o survive and pr oduce a f latox in in c ul t ure med ium and p is tachio nuts hav e been s tudied . a reduction of 60 per c e nt in growth and spore production by asperg i l l us flavus in c u l ture me di um was observed after treatment wi th 100 k rad of...

The yeast-mycelium dimorphism in Ceratocystis ulmi, the causative agent of Dutch elm disease, was switched by gossypol, nordihydroguaiaretic acid, and propylgallate. In each case the mycelial form was converted to the yeast form. These compounds are recognized lipoxygenase inhibitors. Inhibitors of cyclooxygenase and thromboxane synthetase did not cause mycelia to shift to the yeast form. We su...

Listeriolysin was isolated from target rabbit erythrocyte membranes after lysis of the cells with partially purified toxin derived from a culture supernatant of Listeria ivanovii. The membrane form of the toxin exhibited properties similar to those previously found for streptolysin O. Detergent-solubilized, delipidated listeriolysin was found to comprise a heterogeneous population of partially ...

Clostridium perfringens-induced gas gangrene is mediated by potent extracellular toxins, especially alpha toxin (a phospholipase C [PLC]) and theta toxin (perfringolysin O [PFO], a thiol-activated cytolysin); and antibiotic-induced suppression of toxin synthesis is an important clinical goal. The production of PLC and PFO by a gatifloxacin-induced, fluoroquinolone-resistant mutant strain of C. ...

Noradrenaline release from rat brain cortical synaptosomes permeabilized with streptolysin O can be triggered by microM concentrations of free Ca2+. This process was inhibited within minutes by tetanus toxin and its isolated light chain, but not by its heavy chain. The data demonstrate that the effect of tetanus toxin on NA release from purified synaptosomes is caused by the intraterminal actio...

In the article, use of lacewing (chrysopa septempunctata wesmael) against apple red mite (Panonychus ulmi Koch), which is found in intensive orchards territory republic, at different consumption rates (1:5, 1:10, 1:15), based on its pest ratio and biological effectiveness. The results obtained are illuminated. By end season, number mites had been to have decrease 87.8%. Our research, less effec...

We have tested directly the effect of Helminthosporium maydis T (Hmt) toxin and various analogs on the membrane potential formed in mitochondria isolated from a Texas (T) cytoplasmic male-sterile and a normal (N) corn. ATP, malate or succinate generated a membrane potential (negative inside) as monitored by the absorbance change of a cationic dye, safranine. The relative membrane potential (Del...

Cutaneous delayed hypersensitivity to antigens prepared from Sporothrix schenckii and several Ceratocystis species, including C. stenoceras, C. ulmi, C. ips, and C. minor, was tested in 14 patients with known cutaneous sporotrichosis. Extensive cross-reactions were observed. Nonsporotrichotic people (controls) did not react to these antigens. The correlation coefficient between antigens of S. s...