an ultra-violet tolerant wild-type strain of melanin-producing bacillus thuringiensis

An Ultra-Violet Tolerant Wild-Type Strain of Melanin-Producing Bacillus thuringiensis

BACKGROUND Bacillus thuringiensis is the most successful biological control agent used in agriculture, forestry and mosquito control. However, the insecticidal activity of the B. thuringiensis formulation is not very stable and rapidly loses its biological activity under field conditions, due to the ultraviolet radiation in sunlight. Melanin is known to absorb radiation therefore photo protecti...

An ultra-violet light method for producing haploid amphibian embryos.

Melanin: A Solution for Photoprotection of Bacillus thuringiensis Based Biopesticides

Melanins can be obtained by chemical and microbiological synthesis, or by extraction from animal and plant tissues. One of the major problems in studying melanins, is the lack of adequate methods for the isolation of pure melanin pigments. Remarkably, little is known about the structures of melanins, despite their abundance in the global biomass. This is due to the inability of current biochemi...

Plasmid patterns of Bacillus thuringiensis type strains.

Practically all Bacillus thuringiensis strains contain a set of self-replicating, extrachromosomal DNA molecules or plasmids, which vary in number and size in the different strains. The plasmid patterns obtained from gel electrophoresis have previously been used as a tool to characterize strains, but comparison of the plasmid patterns has been limited in the number and diversity of strains anal...

Isolation and Characterization of Melanin Producing Pseudomonas stutzeri Strain UIS2 in the Presence of l-tyrosine and Survey of Biological Properties of Its Melanin

Background: Melanin is a negative charge hydrophobic complex pigment. Melanin is produced naturally in bacteria to protect them against UV, free radicals and environmental stresses. Pigment production in bacteria has more advantages than other biosources due to its rapid growth, higher efficiency and easier extraction. The aim of this study was the isolation, biochemical and molecular identific...

Complete Genome Sequences of Azotobacter vinelandii Wild-Type Strain CA and Tungsten-Tolerant Mutant Strain CA6

We report the complete genome sequences of Azotobacter vinelandii mutant strain CA6 and its parent wild-type strain, CA. When fixing nitrogen, strain CA6 displays slow growth and impaired molybdate uptake, tolerance to tungstates, and production of hydrogen gas, compared to results for strain CA. Comparing these genome sequences may provide a genetic basis for these mutant phenotypes.