Helling
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. O Achatina fulica e sua utilização zooterápica através de dietas acrescidas de própolis / The Achatina fulica, and its´s Zootherapics utilization through the use of a propolis diet
Os escargots da espécie Achatina fulica são caracóis africanos comestíveis e para essa finalidade foram introduzidos no Brasil em 1988 para substituir o escargot europeu Helix sp. Contudo, o hábito alimentar conservador da população brasileira ocasionou prejuízos aos criadores de escargots no Brasil, desencadeando uma soltura irresponsável e anti-é
Publicado em: 2009
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2. Complementation Studies of Arabinose Genes in Escherichia Coli
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3. The Effect of Arabinose-Specific Enzyme Synthesis on Recombination in the Arabinose Genes of ESCHERICHIA COLI
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4. Nalidixic Acid-Resistant Auxotrophs of Escherichia coli
purB and ctr mutants of Escherichia coli are resistant to low levels of nalidixic acid.
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5. Nalidixic Acid-Resistant Mutants of Escherichia coli Deficient in Isocitrate Dehydrogenase
icd Mutants of Escherichia coli K-12, selected for their resistance to nalidixic acid, are deficient in isocitrate dehydrogenase.
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6. icdB mutants of Escherichia coli.
icdB mutations map at 16 min, lead to the specific loss of citrate synthase, and are complemented by a prophage containing a gltA+ gene. Thus, they are allelic with gltA.
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7. Analysis of Endonuclease R·EcoRI Fragments of DNA from Lambdoid Bacteriophages and Other Viruses by Agarose-Gel Electrophoresis
By means of agarose-gel electrophoresis, endonuclease R·EcoRI-generated fragments of DNA from various viruses were separated, their molecular weights were determined, and complete or partial fragment maps for lambda, φ80, and hybrid phages were constructed.
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8. Selection of a Mutant of Escherichia coli Which Has High Mutation Rates
A mutation which causes high mutation rates in all other loci tested was induced with nitrosoguanidine and was selected through the ability of the progeny of such mutant cells to mutate to streptomycin resistance at a higher rate than the wild-type cells. This mutation (mut-2) and the Treffers' mutation (mutT1) mapped at approximately the same position to th
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9. Evolution of Escherichia coli during Growth in a Constant Environment
Populations of Escherichia coli, initiated with a single clone and maintained for long periods in glucose-limited continuous culture, developed extensive polymorphisms. In one population, examined after 765 generations, two majority and two minority types were identified. Stable mixed populations were reestablished from the isolated strains. Factors involved
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10. Speed versus Efficiency in Microbial Growth and the Role of Parallel Pathways
Many microorganisms have sets of parallel pathways for ATP production in respiration and for ATP utilization in glutamate synthesis. The alternatives differ in efficiency of ATP production and utilization. The choice among these parallel pathways has been hypothesized to control the speed and efficiency of growth. Thus, the organism should be able to allevia
American Society for Microbiology.
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11. Toxic Waste Disposal in Escherichia coli
About 10% of the nalidixic acid-resistant (Nalr) mutants in a transposition-induced library exhibited a growth factor requirement as the result of cysH, icdA, metE, or purB mutation. Resistance in all of these mutants required a functional AcrAB-TolC efflux pump, but the EmrAB-TolC pump played no obvious role. Transcription of acrAB was increased in each typ
American Society for Microbiology.
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12. Why does Escherichia coli have two primary pathways for synthesis of glutamate?
Escherichia coli has two primary pathways for glutamate synthetase-glutamate synthase pathway is known to be essential for synthesis at low ammonium concentrations and for regulation of the glutamine pool, but the necessity for glutamate dehydrogenase (GDH) has been uncertain. The results of competition experiments between the wild type and a GDH-deficient m