Abhijit Mitra

Bio: Abhijit Mitra is an academic researcher from International Institute of Information Technology. The author has contributed to research in topics: Base pair & Mangrove. The author has an hindex of 33, co-authored 240 publications receiving 7795 citations. Previous affiliations of Abhijit Mitra include Academy of Sciences of the Czech Republic & College of Mount Saint Vincent.

Rapid chromatographic technique for preparative separations with moderate resolution

Abstract: (11) Potassium ferricyanide has previously been used to convert w'c-1,2-dicarboxylate groups to double bonds. See, for example, L. F. Fieser and M. J. Haddadln, J. Am. Chem. Soc., 86, 2392 (1964). The oxidative dldecarboxylation of 1,2-dlcarboxyllc acids is, of course, a well-known process. See Inter alia (a) C. A. Grob, M. Ohta, and A. Weiss, Helv. Chim. Acta, 41, 1911 (1958); and (b) E. N. Cain, R. Vukov, and S. Masamune, J. Chem. Soc. D, 98 (1969).

Observed changes in water mass properties in the Indian Sundarbans (northwestern Bay of Bengal) during 1980-2007.

Abstract: We present evidence that the Indian Sundarbans is experiencing the effects of climate change over the last three decades. Observations of selected variables, such as the surface water temperature, salinity, pH, dissolved oxygen, and transparency show significant long-term variation over a period of 27 years (1980-2007). Specifically, the temperature in these waters has risen at the rate of 0.5°C per decade, much higher than that observed globally or for the Indian Ocean. Increasing melting of Himalayan ice might have decreased the salinity at the mouth of the Ganges River, at the western end of this deltaic complex. At the same time, salinity has increased on the eastern sector, where the connections to the meltwater sources have become extinct due to heavy siltation of the Bidyadhari Channel. The long-term changes in dissolved oxygen, pH level, transparency and water quality are also examined. The ecological impact of such changes warrants future study.

Polymorphisms at growth‐hormone and prolactin loci in Indian cattle and buffalo

Abstract: Summary A total of 57 Indian Sahiwal (Bos indicus) cattle and 53 Murrah and 19 Nili-Ravi (Bubalus bubalis) buffalo were screened using PCR/RFLP to detect the following alleles at growth hormone (GH) and prolactin (PRL) loci: leucine/valine (L/V) for GH/AluI (amino acid 127), (+/+) for GH/MspI (intron III), and A/B for PRL/RsaI (amino acid 103). Among Sahiwal cattle, gene frequencies were 0.96/0.04 (GH/AluI), 0.86/0.14 (GH/MspI), and 0.49/0.51 (PRL/RsaI). In buffalo, animals of both breeds were homozygous for GH loci (LL, ++). In Egyptian buffalo, 11 samples were also monomorphic, indicating that monomorphism at these two loci may be a species characteristic of buffalo. PRL/RsaI frequencies were 0.93/0.07 and 0.84/0.16 in Murrah and Nili-Ravi buffalo, respectively. Zusammenfassung Bei insgesamt 57 indischen Sahiwal (Bos indicus) und 53 Murrah und Nili-Ravi Buffeln (Bubalus bubalis) wurde mit PCR/RFLP auf die folgenden Polymorphismen des Wachstumshormon- (GH) und Prolaktingens (PRL) untersucht: L/V fur GH/AluI (Austausch Leucin/Valin der Aminosaure 127), (-/+) fur GH/MspI (Intron III) und A/B fur PRL/RsaI (Aminosaure 103). Bei Sahiwal waren die Genfrequenzen 0,96/0,04 (GH/AluI), 0,86/0,14 (GH/MspI) und 0,49/0,51 (PRL/RsaI). Bei den Buffeln waren die Tiere beider Rassen — wie auch 11 agyptische Buffel — homozygot fur die GH Loci (LL, ++), was darauf hinweist, das Buffel monomorph an beiden Schnittstellen sind. Die Frequenzen fur PRL/RsaI betrugen 0,93/0,07 und 0,84/0,16 bei den Murrah and Nili-Ravi Buffeln.

Ab initio calculation of vibrational absorption and circular dichroism spectra using density functional force fields

Abstract: : The unpolarized absorption and circular dichroism spectra of the fundamental vibrational transitions of the chiral molecule, 4-methyl-2-oxetanone, are calculated ab initio. Harmonic force fields are obtained using Density Functional Theory (DFT), MP2, and SCF methodologies and a 5S4P2D/3S2P (TZ2P) basis set. DFT calculations use the Local Spin Density Approximation (LSDA), BLYP, and Becke3LYP (B3LYP) density functionals. Mid-IR spectra predicted using LSDA, BLYP, and B3LYP force fields are of significantly different quality, the B3LYP force field yielding spectra in clearly superior, and overall excellent, agreement with experiment. The MP2 force field yields spectra in slightly worse agreement with experiment than the B3LYP force field. The SCF force field yields spectra in poor agreement with experiment.The basis set dependence of B3LYP force fields is also explored: the 6-31G* and TZ2P basis sets give very similar results while the 3-21G basis set yields spectra in substantially worse agreements with experiment. jg

Automated Eukaryotic Gene Structure Annotation Using EVidenceModeler and the Program to Assemble Spliced Alignments

Abstract: EVidenceModeler (EVM) is presented as an automated eukaryotic gene structure annotation tool that reports eukaryotic gene structures as a weighted consensus of all available evidence. EVM, when combined with the Program to Assemble Spliced Alignments (PASA), yields a comprehensive, configurable annotation system that predicts protein-coding genes and alternatively spliced isoforms. Our experiments on both rice and human genome sequences demonstrate that EVM produces automated gene structure annotation approaching the quality of manual curation.

Astaxanthin: Sources, Extraction, Stability, Biological Activities and Its Commercial Applications—A Review

Abstract: There is currently much interest in biological active compounds derived from natural resources, especially compounds that can efficiently act on molecular targets, which are involved in various diseases. Astaxanthin (3,3'-dihydroxy-β, β'-carotene-4,4'-dione) is a xanthophyll carotenoid, contained in Haematococcus pluvialis, Chlorella zofingiensis, Chlorococcum, and Phaffia rhodozyma. It accumulates up to 3.8% on the dry weight basis in H. pluvialis. Our recent published data on astaxanthin extraction, analysis, stability studies, and its biological activities results were added to this review paper. Based on our results and current literature, astaxanthin showed potential biological activity in in vitro and in vivo models. These studies emphasize the influence of astaxanthin and its beneficial effects on the metabolism in animals and humans. Bioavailability of astaxanthin in animals was enhanced after feeding Haematococcus biomass as a source of astaxanthin. Astaxanthin, used as a nutritional supplement, antioxidant and anticancer agent, prevents diabetes, cardiovascular diseases, and neurodegenerative disorders, and also stimulates immunization. Astaxanthin products are used for commercial applications in the dosage forms as tablets, capsules, syrups, oils, soft gels, creams, biomass and granulated powders. Astaxanthin patent applications are available in food, feed and nutraceutical applications.