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排序方式: 共有115条查询结果,搜索用时 15 毫秒
1.
Ranganathan Santhanam 《Inorganica chimica acta》2008,361(2):473-478
A novel method of preparation of hexahydroaluminate complexes M3AlH6 (M = Li, Na or K) from the corresponding alkali metal hydride and tetrahydroaluminate has been explored, using dimethyl ether (Me2O) as a solvent at near-ambient temperatures. The results are compared with those obtained using a recently established mechanochemical approach. Characterization of the products by powder X-ray diffraction revealed M3AlH6 to be formed in high yield for M = Li and Na, but not for M = K. The attempted preparation of Li2NaAlH6 and Li2KAlH6 was unsuccessful. 相似文献
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Gianpiero Di Leva Claudia Piovan Pierluigi Gasparini Apollinaire Ngankeu Cristian Taccioli Daniel Briskin Douglas G. Cheung Brad Bolon Laura Anderlucci Hansjuerg Alder Gerard Nuovo Meng Li Marilena V. Iorio Marco Galasso Santhanam Ramasamy Guido Marcucci Danilo Perrotti Kimerly A. Powell Anna Bratasz Michela Garofalo Kenneth P. Nephew Carlo M. Croce 《PLoS genetics》2013,9(3)
4.
Srinivasan Pugazhendhi Srikanth Santhanam Jayanthi Venkataraman Isabelle Creveaux Balakrishnan S. Ramakrishna 《Gene》2013
Background
Three mutations (two missense and one frameshift) in the NOD2 gene are associated with Crohn's disease (CD) in a proportion of patients with Crohn's disease in North America, Europe and Australia. These three mutations are not found in Indian patients with CD. We undertook new studies to identify polymorphisms in the NOD2 gene in the Indian population and to detect whether any of these were associated with inflammatory bowel disease (IBD) in this population.Methods
Individual exons of the NOD2 gene were amplified by PCR and subjected to denaturing high performance liquid chromatography (DHPLC) to detect heteroduplex formation. All 12 exons of the NOD2 gene were amplified and Sanger-sequenced to detect polymorphisms in the NOD2 gene. 310 patients with CD, 318 patients with ulcerative colitis (UC) and 442 healthy controls (HC) were recruited for association studies. DNA from these participants was evaluated for the identified eight polymorphisms by Sequenom analysis.Results
Heteroduplex formation was noted by DHPLC in exons 2 and 4 of the NOD2 gene. Sequencing of the entire NOD2 gene data revealed eight polymorphisms – rs2067085, rs2066842, rs2066843, rs1861759, rs2111235, rs5743266, rs2076753, and rs5743291 – of which the latter four were described for the first time in Indians. None of these polymorphisms was associated with CD. The SNPs rs2066842 and rs2066843 were in significant linkage disequilibrium. Both SNPs showed a significant association with UC (P = 0.03 and 0.04 respectively; odds ratio 1.44 and 1.41 respectively).Conclusion
Four NOD2 polymorphisms were identified for the first time in the Indian population. Of 8 NOD2 polymorphisms, none were associated with CD but two were weakly associated with UC. NOD2 polymorphisms do not play a major role in CD genesis in India. 相似文献5.
Rakesh Santhanam Xiaoying Rong Ying Huang Barbara A. Andrews Juan A. Asenjo Michael Goodfellow 《Antonie van Leeuwenhoek》2013,103(2):367-373
A Streptomyces strain isolated from a hyper-arid Atacama Desert soil was characterised using a polyphasic taxonomic approach. The strain, designated C2T, had chemical and morphological properties typical of the genus Streptomyces. The isolate formed a branch in the Streptomyces 16S rRNA gene tree together with the type strain of Streptomyces chromofuscus and was also loosely related to Streptomyces fragilis NRRL 2424T. DNA:DNA relatedness values between the isolate and its two phylogenetic neighbours showed that it formed a distinct genomic species. The strain was readily distinguished from these organisms using a combination of morphological and phenotypic data. Based on the genotypic and phenotypic results, isolate C2T represents a novel species in the genus Streptomyces, for which the name Streptomyces bullii sp. nov. is proposed. The type strain is C2T (=CGMCC 4.7019T = KACC 15426T). 相似文献
6.
The DNA adducts were analyzed by 32P-postlabeling method following exposure of human uroepithelial cells (HUC) to N-hydroxy-4-aminobiphenyl (N-OH-ABP), the proximate metabolite of the human bladder carcinogen 4-aminobiphenyl (ABP). TLC of the postlabeled products on the first dimension revealed several products, the majority of which stayed close to the origin and were earlier identified as the 3',5' -bisphospho derivatives of N-(deoxyguanosin-8-yl)-4-aminobiphenyl and N-(deoxyadenosin-8-yl)-4-aminobiphenyl (Carcinogenesis 13 (1993) 955; Carcinogenesis 16 (1995) 295). Here we report characterization of two additional adducts that amounted to less than 5% of the total adducts. Autoradiography of D1 chromatogram of the postlabeled products of calf thymus DNA chemically interacted with N-OH-ABP under acidic conditions revealed two adducts, #1 and #2, with R(f) values of about 0.2 and 0.3, respectively. Two adducts with D1 thin layer chromatographic properties similar to those of adducts #1 and #2 were obtained on postlabeling analyses of products generated by chemical interaction of N-acetoxy-4-aminobiphenyl (N-OAc-ABP) with deoxyguanosine-3' -monophosphate (dGp). Based on proton NMR and mass spectroscopic analyses of the synthetic products derived from N-OAc-ABP, the chemical structures of adducts #1 and #2 have been identified as 3-(deoxyguanosin-N(2)-yl)-4-aminobiphenyl, and N-(deoxyguanosin-N(2)-yl)-4-aminobiphenyl, respectively. Both of these adducts were insensitive to digestion with nuclease P1. 32P-Postlabeling analysis of the nuclease P1 enriched DNA hydrolysate of HUC cells treated with N-OH-ABP showed the presence of adduct #2 but not adduct #1. Adduct #2 was also detected in calf thymus DNA incubated with HUC cytosol and N-OH-ABP in the presence of acetyl CoA. These results suggest that in the target cells for ABP carcinogenesis in vivo, N-OH-ABP is bioactivated by acetyl CoA-dependent acyltransferases to reactive arylnitrenium ions that covalently interact at N(2)-position of deoxyguanosine in DNA. 相似文献
7.
Shanmugam Vanithamani Santhanam Shanmughapriya Ramasamy Narayanan Veerapandian Raja Murugesan Kanagavel Karikalacholan Sivasankari Kalimuthusamy Natarajaseenivasan 《PloS one》2015,10(9)
Background
Leptospirosis is a re-emerging infectious disease that is under-recognized due to low-sensitivity and cumbersome serological tests. MAT is the gold standard test and it is the only serogroup specific test used till date. Rapid reliable alternative serogroup specific tests are needed for surveillance studies to identify locally circulating serogroups in the study area.Methods/Principal Findings
In the present investigation the serological specificity of leptospiral lipopolysaccharides (LPS) was evaluated by enzyme linked immunosorbent assay (ELISA), dot blot assay and rapid immunochromatography based lateral flow assay (ICG-LFA). Sera samples from 120 MAT positive cases, 174 cases with febrile illness other than leptospirosis, and 121 seronegative healthy controls were evaluated for the diagnostic sensitivity and specificity of the developed assays. LPS was extracted from five locally predominant circulating serogroups including: Australis (27.5%), Autumnalis (11.7%), Ballum (25.8%), Grippotyphosa (12.5%), Pomona (10%) and were used as antigens in the diagnostics to detect IgM antibodies in patients’ sera. The sensitivity observed by IgM ELISA and dot blot assay using various leptospiral LPS was >90% for homologous sera. Except for Ballum LPS, no other LPS showed cross-reactivity to heterologous sera. An attempt was made to develop LPS based ICG-LFA for rapid and sensitive serogroup specific diagnostics of leptospirosis. The developed ICG-LFA showed sensitivity in the range between 93 and 100% for homologous sera. The Wilcoxon analysis showed LPS based ICG-LFA did not differ significantly from the gold standard MAT (P>0.05).Conclusion
The application of single array of LPS for serogroup specific diagnosis is first of its kind. The developed assay could potentially be evaluated and employed for as MAT alternative. 相似文献8.
Soucy KG Lim HK Benjo A Santhanam L Ryoo S Shoukas AA Vazquez ME Berkowitz DE 《Radiation and environmental biophysics》2007,46(2):179-186
Irradiation of the heart and vasculature can cause a spectrum of cardiovascular complications, including increased risk of
myocardial infarction or coronary heart disease. Although irradiation is implicated in oxidant stress and chronic inflammation,
the underlying molecular mechanisms have not been elucidated. We tested the hypothesis that irradiation-initiated upregulation
of xanthine oxidase (XO), a primary source of cardiovascular reactive oxygen species, contributes to endothelial dysfunction
and increased vascular stiffness. Twenty-two, 3-month-old Sprague–Dawley male rats were gamma-irradiated at the following
doses: 0, 50, 160, and 500 cGy. Rats exposed to 500 cGy showed a significant increase in endothelial XO expression and a twofold
increase in XO activity, compared to the 0 cGy controls. Endothelial function was investigated ex vivo through vascular tension
dose–responses to the endothelial dependent vasodilator, acetylcholine. Endothelial-dependent relaxation in aorta of the 500 cGy
exposed rats was significantly attenuated from the control group. Remarkably, specific inhibition of XO with oxypurinol restored
the relaxation response to that of the control. Furthermore, these ex vivo results are reflected in vivo through alterations
in vascular stiffness, as measured by pulse wave velocity (PWV). As early as 1-day post-exposure, rats exhibited a significant
increase in PWV from pre-exposure. The PWV of irradiated rats (50, 160, and 500 cGy) were greater than those of 0 cGy control
rats at 1 day, 1 and 2 weeks. The sham and irradiated rats possessed equivalent pre-exposure PWV, with sham showing no change
over 2 weeks. Thus, these findings suggest that early upregulation of XO contributes to oxidative stress and endothelial nitro-redox
imbalance with resultant endothelial dysfunction and altered vascular mechanics. Furthermore, these data identify XO as a
potential molecular target for attenuating irradiation-induced cardiovascular injury. 相似文献
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