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Polyhydroxyalkanoates are a fascinating group of biological polymers, which have attracted extensive attention. An effectual PHB accumulating Bacillus cereus strain VIT-SSR1 was isolated from industrial effluent contaminated site. Plackett-Burman design was used to screen the critical factors affecting PHA production. Response surface method was employed to evaluate the interactive effects between the independent variables. The Central composite design was performed to optimize the concentrations of Molasses, ammonium sulphate and initial pH. A PHA content of (1.42 ± 0.01) g/L and a maximum PHA yield of (40.3 ± 0.77) % was obtained on implementing the optimized conditions. The produced biopolymer was analysed using Fourier transform infrared spectroscopy (FT-IR) and Gas chromatography-mass spectrometry analysis(GC-MS) and the thermal properties of the biopolymer were evaluated by Thermogravimetric analysis (TGA), and from the Nuclear magnetic Resonance (NMR) analysis the biopolymer was identified to be polyhydroxybutyrate (PHB). PHB-chitosan blends were prepared and tested for biocompatibility by MTT assay on L929 mouse fibroblast cell lines. Curcumin, a well-known drug was loaded onto PHB-chitosan films and their drug release pattern was observed. Curcumin showed a sustained mode of drug release. PHB films are biocompatible and can act as a potent polymer matrix for drug release studies.
Pubmed ID: 31128180
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NIH genetic sequence database that provides annotated collection of all publicly available DNA sequences for almost 280 000 formally described species (Jan 2014) .These sequences are obtained primarily through submissions from individual laboratories and batch submissions from large-scale sequencing projects, including whole-genome shotgun (WGS) and environmental sampling projects. Most submissions are made using web-based BankIt or standalone Sequin programs, and GenBank staff assigns accession numbers upon data receipt. It is part of International Nucleotide Sequence Database Collaboration and daily data exchange with European Nucleotide Archive (ENA) and DNA Data Bank of Japan (DDBJ) ensures worldwide coverage. GenBank is accessible through NCBI Entrez retrieval system, which integrates data from major DNA and protein sequence databases along with taxonomy, genome, mapping, protein structure and domain information, and biomedical journal literature via PubMed. BLAST provides sequence similarity searches of GenBank and other sequence databases. Complete bimonthly releases and daily updates of GenBank database are available by FTP.
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