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951.
Rupam Dutta Subimal Laskar Probodh Borah Dhrubajyoti Kalita Bula Das Galib Zaman Nagendra Nath Barman Deep Prakash Saikia 《Molecular biology reports》2014,41(6):3677-3681
Assam hill goat (Capra hircus) is a prolific local goat in India. bone morphogenetic protein receptor (BMPR1B) gene was studied as a candidate gene for the prolificacy of goats. The objective of the present study was to detect the incidence of mutation in the exonic region of BMPR1B gene of Assam hill goat. Total 90 blood samples were collected randomly from different parts of Assam and genomic DNA were extracted using phenol–chloroform method. The quantity and quality of extracted DNA was examined by spectrophotometry and gel electrophoresis, respectively. PCR amplicon showed a product of 140 bp fragment of BMPR1B gene. The purified product upon digestion with AvaII showed monomorphic banding pattern and revealed wild type alleles with AA genotype. Nucleotide sequencing showed one new mutation 773 (G→C) which is found to be unique in Assam hill goat. Construction of tree at nucleotide level generates from the present experiment lies in common cluster which differs from the other breeds of goat. The analysis of polymorphism for BMPR1B in Assam hill goat indicates that the genetic factor responsible for prolificacy or multiple kidding rates is not related to the reported mutated alleles of BMPR1B gene. Therefore, attempts to be made to detect other SNPs for BMPR1B gene or otherwise effort should be made towards other fecundity gene which might be responsible for the prolificacy of Assam hill goat. 相似文献
952.
953.
Jaseetha Abdul Salam Nilanjana Das 《World journal of microbiology & biotechnology》2014,30(4):1301-1313
A new yeast strain was isolated from sugarcane cultivation field which was able to utilize lindane as sole carbon source for growth in mineral medium. The yeast was identified and named as Candida sp. VITJzN04 based on a polyphasic approach using morphological, biochemical and 18S rDNA, D1/D2 and ITS sequence analysis. The isolated yeast strain efficiently degraded 600 mg L?1 of lindane within 6 days in mineral medium under the optimal conditions (pH 7; temperature 30 °C and inoculum dosage 0.06 g L?1) with the least half-life of 1.17 days and degradation constant of 0.588 per day. Lindane degradation was tested with various kinetic models and results revealed that the reaction could be described best by first-order and pseudo first-order models. In addition, involvement of the enzymes viz. dechlorinase, dehalogenase, dichlorohydroquinone reductive dechlorinase, lignin peroxidase and manganese peroxidase was noted during lindane degradation. Addition of H2O2 in the mineral medium showed 32 % enhancement of lindane degradation within 3 days. Based on the metabolites identified by GC–MS and FTIR analysis, sequential process of lindane degradation by Candida VITJzN04 was proposed. To the best of our knowledge, this is the first report of isolation and characterization of lindane-degrading Candida sp. and elucidation of enzyme systems during the degradation process. 相似文献
954.
Aparajita Das Swati Tripathi Ajit Varma 《World journal of microbiology & biotechnology》2014,30(3):1075-1084
The present study was conducted for optimization of in vitro substrates under aseptic conditions for interaction of Piriformospora indica with the medicinal plant Coleus forskohlii. It aims to test the effects of different substrates on P. indica colonization as well as growth parameters of the in vitro raised C. forskohlii. Interaction of in vitro C. forskohlii with root endophyte P. indica under aseptic condition resulted in increase in growth parameters in fungus colonized plants. It was observed that P. indica promoted the plant’s growth in all irrespective of substrates used for co-culture study. The growth was found inferior in liquid compared to semisolid medium as well as there was problem of hyperhydricity in liquid medium. P. indica treated in vitro plantlets were better adapted for establishment under green house compared to the non treated plants due to fungal intervention. 相似文献
955.
A. Selvi Jaseetha Abdul Salam Nilanjana Das 《World journal of microbiology & biotechnology》2014,30(11):2839-2850
Cefdinir, a semi-synthetic third generation cephalosporin antibiotic being considered as an emerging pollutant, demands removal from aquatic ecosystems. A yeast strain isolated from pharmaceutical wastewater which was identified as Ustilago sp. SMN03 by molecular techniques and was found to be capable of utilizing cefdinir as a sole carbon source. The isolate was found to degrade 81 % of cefdinir within 6 days under optimized conditions viz. pH 6.0, temperature 30 °C, a shaking speed of 120 rpm, an inoculum dosage of 4 % (w/v) and an initial cefdinir concentration of 200 mg L?1. Kinetic studies revealed that cefdinir degradation followed the pseudo-first order model, a rate constant of 0.222 per day and a half-life period of 3.26 days. Using LC–MS analysis, six novel intermediates formed during the cefdinir degradation were identified and characterized. FT-IR analysis showed that the functional groups ranging from 1,766 to 1,519 cm?1, characteristic for lactam ring were completely removed during the cefdinir degradation. The opening of the β-lactam ring was one of the major steps in the cefdinir degradation process. Based on the results from the present study, a possible pathway of cefdinir degradation by Ustilago sp. SMN03 was proposed. To the best of our knowledge, this is the first report on microbial degradation of cefdinir by yeast. 相似文献
956.
Satyabrata Bag Bhabatosh Das Shreya Dasgupta Rupak K. Bhadra 《Archives of microbiology》2014,196(8):575-588
RelMtb, a GTP pyrophosphokinase encoded by the Mycobacterium tuberculosis (Mtb) genome, catalyzes synthesis of (p)ppGpp from ATP and GDP(GTP) and its hydrolysis to GDP(GTP) and pyrophosphate to mediate stringent response, which helps bacteria to survive during nutrient limitation. Like other members of Rel_Spo homologs, RelMtb has four distinct domains: HD, Rel_Spo (RSD), TGS and ACT. The N-terminal HD and RSD are responsible for (p)ppGpp hydrolysis and synthesis, respectively. In this study, we have dissected the rel Mtb gene function and determined the minimal region essential for (p)ppGpp synthetic activity. The RelMtb and its truncated derivatives were expressed from an arabinose inducible promoter (P BAD ), and in vivo functional analyses were done in a (p)ppGpp null Escherichia coli strain. Our results indicate that only 243 amino acids (188–430 residues) containing fragment are sufficient for RelMtb (p)ppGpp synthetic activity. The results were further confirmed by in vitro assays using purified proteins. We further characterized the RSD of RelMtb by substituting several conserved amino acids with structurally related residues and identified six such residues, which appeared to be critical for maintaining its catalytic activity. Furthermore, we have also extended our analysis to an RSD encoding gene rv1366 of Mtb, and experimental results indicated that the encoded protein Rv1366 is unable to synthesize (p)ppGpp. 相似文献
957.
958.
This commentary highlights the effectiveness of optoelectronic properties of polymer semiconductors based on recent results emerging from our laboratory, where these materials are explored as artificial receptors for interfacing with the visual systems. Organic semiconductors based polymer layers in contact with physiological media exhibit interesting photophysical features, which mimic certain natural photoreceptors, including those in the retina. The availability of such optoelectronic materials opens up a gateway to utilize these structures as neuronal interfaces for stimulating retinal ganglion cells. In a recently reported work entitled “A polymer optoelectronic interface provides visual cues to a blind retina,” we utilized a specific configuration of a polymer semiconductor device structure to elicit neuronal activity in a blind retina upon photoexcitation. The elicited neuronal signals were found to have several features that followed the optoelectronic response of the polymer film. More importantly, the polymer-induced retinal response resembled the natural response of the retina to photoexcitation. These observations open up a promising material alternative for artificial retina applications. 相似文献
959.
Eun Jin Kim Dokyung Lee Se Hoon Moon Chan Hee Lee Sang Jun Kim Jae Hyun Lee Jae Ouk Kim Manki Song Bhabatosh Das John D. Clemens Jean William Pape G. Balakrish Nair Dong Wook Kim 《PLoS pathogens》2014,10(9)
Pandemic V. cholerae strains in the O1 serogroup have 2 biotypes: classical and El Tor. The classical biotype strains of the sixth pandemic, which encode the classical type cholera toxin (CT), have been replaced by El Tor biotype strains of the seventh pandemic. The prototype El Tor strains that produce biotype-specific cholera toxin are being replaced by atypical El Tor variants that harbor classical cholera toxin. Atypical El Tor strains are categorized into 2 groups, Wave 2 and Wave 3 strains, based on genomic variations and the CTX phage that they harbor. Whole-genome analysis of V. cholerae strains in the seventh cholera pandemic has demonstrated gradual changes in the genome of prototype and atypical El Tor strains, indicating that atypical strains arose from the prototype strains by replacing the CTX phages. We examined the molecular mechanisms that effected the emergence of El Tor strains with classical cholera toxin-carrying phage. We isolated an intermediary V. cholerae strain that carried two different CTX phages that encode El Tor and classical cholera toxin, respectively. We show here that the intermediary strain can be converted into various Wave 2 strains and can act as the source of the novel mosaic CTX phages. These results imply that the Wave 2 and Wave 3 strains may have been generated from such intermediary strains in nature. Prototype El Tor strains can become Wave 3 strains by excision of CTX-1 and re-equipping with the new CTX phages. Our data suggest that inter-chromosomal recombination between 2 types of CTX phages is possible when a host bacterial cell is infected by multiple CTX phages. Our study also provides molecular insights into population changes in V. cholerae in the absence of significant changes to the genome but by replacement of the CTX prophage that they harbor. 相似文献
960.
Prakash?Chandra?JoshiEmail author Mirak?Raj?Angdembe Sumon?Kumar?Das Shahnawaz?Ahmed Abu?Syed?Golam?Faruque Tahmeed?Ahmed 《International breastfeeding journal》2014,9(1):7