Publications

[modes of tetracycline resistance in bacillus thuringiensis].	the sensitive strain and tetracycline-resistant mutants exhibit two types of growth curves after addition of tetracycline. the level of resistance of these strains is enhanced by a short period of preincubation with a non-inhibitive concentration of tetracycline.	1978	99258
[study of lysogeny in bacillus thuringiensis and b. cereus].	forty-eight strains of bacillus thuringiensis and 12 strains of b. cereus were treated with ultraviolet light and mitomycin c. the former agent was the more effective inducer. bacillus thuringiensis produces at least seven different phage particles with long, non-contractile tails. the frequencies of lysogeny and polylysogeny are 83 and 25% respectively. morphologically defective phages occur in 25% of strains, whereas five of them produce low molecular-weight bacteriocins. one strain of b. cere ...	1978	98223
[cytological study of the action of bacillus thuringiensis var. israelensis on mosquito larvae].	a comparison is made between the cytopathological effects of b. thuringiensis var. israelensis on aedes aegypti larvae and the cytopathological effects of the other varieties of b. thuringiensis on lepidoptera larvae. the same primary action is observed, with the loss of integrity of the gut epithelium, the cells of which appear swollen, distorted and finally burst.	1978	97020
[toxicity of bacillus thuringienses var. israelensis for larvae of aedes aegypti and anopheles stephensi].	the comparative study of the larvicidal action of b. thuringiensis var. israelensis on a. aegypti and a. stephensi shows the greater sensitivity of a. aegypti, with 100% of mortality in 30 to 40 min. at high doses. but, for both species of mosquito, the toxicity of these bacteria is very high, as shown by the mortality regression curves and by the lc50. this toxicity is associated with the crystals and can be extracted from them by dilute alkali solution, like the general case of the other serot ...	1978	96979
application of bathurin and borax in the biological control of monomorium pharaonis in housing estates.	of two apartment houses infested with ants of the species monomorium pharaonis, one was treated with a biological, the other with a chemical substance. in the first case we used bathurin in combination with borax at a concentration of 1.3% for both substances. in the first week, borax was added to the bait (minced beef), within the next three weeks, the bait was mixed with bathurin. the procedure was repeated 5 times. after this period, we achieved complete control of the ants on the infested pr ...	1976	62524
toxicity of parasporal crystals of bacillus thuringiensis subsp. israelensis to mosquitoes.	toxicity of bacillus thuringiensis subsp. israelensis (onr-60a/who 1897) parasporal crystals to three medically important mosquito larvae is described. the numbers of larvae killed are in relation to crystal dry weight. the crystals are lethally toxic to aedes aegypti linnaeus (mean 50% lethal concentration [lc50] = 1.9 x 10(-4) micrograms/ml), culex pipiens var. quinquefasciatus say (lc50 = 3.7 x 10(-4) micrograms/ml), and anopheles albimanus wiedemann (lc50 = 8.0 x 10(-3) micrograms/ml). purfi ...	1979	44177
mechanism of inhibition of active potassium transport in isolated midgut of manduca sexta by bacillus thuringiensis endotoxin.	after incubation at ph 10 or higher, bacillus thuringiensis spores and endotoxin, at concentrations above 0.1 iu/ml, affected transport parameters in the isolated midgut of manduca sexta larvae. (toxic activity was lost during roughly 1 week at ph 11.) about 60% of the short-circuit current was inhibited, and the remainder was reversibly inhibited by anoxia. electrical resistance was reduced by about 55% and oxygen uptake stimulated by about 30%. influx of potassium from blood-side to lumen-side ...	1979	43881
[determination of the antibacterial activity of various mycotoxins using bacillus thuringiensis (berliner)].	antibacterial activity of pure preparations of mycotoxins, was studied against strains of bacillus thuringiensis (berliner). most of fungal metabolites used provokes: 1) growth bacterial inhibition similar to lethal effect of antibiotics 2) enlargment of cell volume; this cell abnormality induction resembles those obtained with mitomycin c. the bioassay of fungal toxins with b. thuringiensis can be recommended as a sensitive technique to supplement chemical characterization. by using specific ce ...	1979	36567
[construction of partial denaturation charts for dna with random base distribution].	by measuring dna temperature transition profiles the evidence was obtained that dna of phages tg9 and ob infecting bacillus thuringiensis and brevibacterium flavum respectively have a random base distribution. after alkaline treatment in the presence of 10 per cent formaldehyde at room temperature partially denatured molecules of phage tg9 and ob dna's with different degrees of denaturation were obtained. using electron microscopy the maps of distribution of melted regions along these dna's were ...	1977	36554
[comparative sensitivities of six different species of mosquitoes to bacillus thuringiensis var. israelensis].		1979	34488
[effect of ph on the growth of bacillus thuringiensis].	the effect of ph on the growth phase parameters was studied with bacillus thuringiensis. the experimental data obtained were used to draw the regression equation describing the spore titre as a function of ph. as a result of analysing the equation coefficients and the effect of ph on the growth phase parameters, a ph profile has been proposed which favours an increase in the titre of spores. the profile decreases the rate of oxygen uptake at the exponential growth phase and increases the rate of ...	1979	34081
proteins of bacillus thuringiensis delta-endotoxin crystals.	pure crystals (at least 99% purification) of sigma-endotoxin were isolated from bac. thuringiensis var. galleriae. the complete dissolution of crystals might be achieved by the increase of ph up to 12 and higher or by a combined action of s = s-reducing and denaturing agents. electrophoresis of the solubilized crystal proteins in 5% polyacrylamide gels containing 0,1% sodium dodecyl sulfate and 8 m urea reveals two major bands corresponding to molecular weights of 120000--140000 (65%) and 65000 ...	1977	21000
chitinase of bacillus thuringiensis.	strains of bacillus thuringiensis were shown to hydrolyse various forms of chitin around growing colonies on a solid medium. in conditions of submerged cultivation on a medium containing demineralized crab shells, bac. thuringiensis var. caucasicus inmi arm. 837 manifests the chitinolytic activity at the beginning of the stationary growth phase. the activity of chitinase which is of a constitutive nature increases when the bacterium is cultivated at ph 7.2. the maximum rate of hydrolysis of coll ...	1976	13274
production of lecithinase by bacillus thuringiensis.	the activity of lecithaniase was determined in 24 strains of bacillus thuringiensis on four growth media. the highest accumulation of lecithinase was found on the hottinger medium containing 0.5% of glucose and 0.56% of sodium bicarbonate. lecithinase appears at the logarithmic growth phase, and its activity is maximal after 10 hours of growth (at the beginning of the stationary phase). biosynthesis and accumulation of lecithinase occur at ph 6.0 to 9.0. lecithinase was purified by salting out w ...	1975	2844
interrelationship between the intestinal microflora of lackey moth, brown-tail moth and the entomopathogenic bacterium bacillus thuringiensis.	the interrelationship between the intestine microflora of lackey moth (malacosoma neustria l.), brown-tail moth (nygmia phaeorrhoea l.) and entomopathogenic bacteria bacillus thuringiensis (berl.), bac. thuringiensis var. galleriea, and bac. thuringiensis kr3 was studied in vitro. various organisms of the intestine microflora of lackey moth display bacteriostatic action towards bac. thuringiensis var. galleriea and bac. thuringiensis kr3 which is not typical of the microflora of brown-tail moth ...	1975	2842
study of the sporulation of bacillus thuringiensis var. thuringiensis.	during the submerged cultivation of bacillus thuringiensis var. thuringiensis in 300- and 3000-liter fermentors, lysis occurred at the end of the exponential phase of growth. new vegetative cells were subsequently formed which usually sporulated. at time of lysis, the amount of soluble sugar was 1-12 g/liter, ph value dropped to 5.3-5.8 from the original ph 6.8 and started to rise after all the cells had lysed. the proteolytic activity was low during the lysis and increased as the sporulation co ...	1975	1076