The development of green approaches for the biosynthesis of silver nanoparticles (AgNPs) is of prime significance in the field of nanotechnology research. A fast and eco-friendly protocol for the biosynthesis of extracellular AgNPs using culture supernatant (CS) from the fungus Cunninghamella phaeospora was studied in this work. This CS was proved as a potential new source for the extracellular...

background the production of nanoparticles using a biosystem is considered green chemistry. application of plant extracts as a biological process has been proven to be suitable for synthesis of nanoparticles. objectives this study designed in order to evaluate the production of silver nanoparticles using juglans regia leaf extract and to compare the outcome of different preparation methods of p...

in this study, the biosynthesis of gold nanoparticles by penicillium chrysogenum, isolated from ahar copper mine, was investigated. the gold nanoparticles were synthesized by reducing the aqueous gold ions using the culture supernatant of the filamentous fungi. the uv–vis spectrum displayed a characteristic peak at 532 nm that is very specific for gold nanoparticles. the xrd spectrum confirmed ...

materials and methods statistical and regressive modeling methods were used to investigate the effects of the carbon source and to optimize the production media. results the spinosad production of s. spinosa co121 increased 77.13%, from 310.44 ± 21.84 μg/ml in the initial fermentation medium (with glucose as the main carbon source) to 549.89 ± 38.59 μg/ml in a new optimized fermentation medium ...

The plant hormone auxin drives plant growth and morphogenesis. The levels and distribution of the active auxin indole-3-acetic acid (IAA) are tightly controlled through synthesis, inactivation, and transport. Many auxin precursors and modified auxin forms, used to regulate auxin homeostasis, have been identified; however, very little is known about the integration of multiple auxin biosynthesis...

Platensimycin (PTM) and platencin (PTN) are potent and selective inhibitors of bacterial and mammalian fatty acid synthases and have emerged as promising drug leads for both antibacterial and antidiabetic therapies. Comparative analysis of the PTM and PTN biosynthetic machineries in Streptomyces platensis MA7327 and MA7339 revealed that the divergence of PTM and PTN biosynthesis is controlled b...

We report an approach for spatially selective assembly of an enzyme onto selected patterns of microfabricated chips. Our approach is based on electrodeposition of the aminopolysaccharide chitosan onto selected electrode patterns and covalent conjugation of a target enzyme to chitosan upon biochemical activation of a genetically fused "pro-tag." We report assembly of S-adenosylhomocysteine nucle...

Photoregulated carotenoid biosynthesis consists of an initiating photoactivation which bestows carotenogenic competence upon photochromogenic microorganisms. Subsequent carotenoid biosynthesis is light independent but requires microbial growth. Experimental systems have been developed for several photochromogcnic microorganisms to separate the primary photoact from the following carotenogenic r...