检索结果-南通市图书馆

nitric oxide alleviates cadmium-impeded growth by limiting ROS accumulation in pea seedlings

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

BIOCELL 2022年第12期46卷 2583-2593页

作者： EKHLAQUE A.KHAn HAMDInO M.I.AHMED MEEnA misra PALLAVI SHARMA amarendra n.misra MIRZA HASAnUZZAMAn Department of Life Sciences Central University of JharkhandRanchi835205India Department of Biotechnology Chaudhary Bansi Lal UniversityBhiwani127021India Horticulture Research Institute(HRI) Agricultural Research Center(ARC)Giza12619Egypt School of Environment and Sustainable Development Central University of GujratGandhinagar382030India School of Applied Sciences Centurion University of Technology and ManagementBhubaneswar752050India Department of Agronomy Faculty of AgricultureSher-e-Bangla Agricultural UniversityDhaka1207Bangladesh

Cadmium(Cd)causes oxidative stress,which leads to the oxidation of various biomolecules by the production of reactive oxygen species(ROS)to facilitate programmed cell death(PCD).The antioxidant defense system fails to detoxify ROS when it is produced in *** oxide(nO),a gaseous free radical and a phytohormone,regulates various physiological processes of ***,this work was undertaken to study the effects of the application of exogenous sodium nitroprusside(SnP,a nO donor)on growth parameters,oxidative stress,accumulation of secondary metabolites,and activities of antioxidant enzymes under Cd ***(50μM)and severe(200μM)Cd stress were applied to hydroponically grown pea(Pisum sativum L.)plants with or without 50μM *** Cd stress had a substantial impact on the *** effectiveness of nO in reducing Cd-induced negative effects on plant height,fresh weight,dry weight,protein content,nitrite content,nitrate reductase(nR)activity,catalase activity,and peroxidase activity were *** development,protein content,nitrite content,nitrate reductase(nR)activity,antioxidant defense systems disruption,overproduction of reactive oxygen species,and oxidative damage were *** antioxidant defense system(catalase and peroxidase activities)was activated by nO,which resulted in lower lipid peroxidation and lower hydrogen peroxide(H2O2)levels in Cd-exposed *** treatment boosted endogenous nO levels and nR activity in Cd-stressed plants while also enhanced proline levels to preserve osmotic *** presence of total phenols and flavonoids increased after SnP treatment,indicating that SnP enhanced stress recovery and boosted plant development in Cd-stressed plants.

关键词： Cadmium SnP Reactive oxygen species Oxidative stress Programmed cell death

Comprehensive spectral analysis of Cyg X-1 using RXTE data

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2012年第10期12卷 1427-1438页

作者： Rizwan Shahid Ranjeev misra S.n.A.Jaaffrey Department of Physics M.L.Sukhadia UniversityUdaipur-313001India Inter University Centre for Astronomy and Astrophysics Pune-411007India

We analyze a large number （〉 500） of pointed Rossi X-Ray Timing Explorer （RXTE） observations of Cyg X- 1 and model the spectrum of each one. A subset of the observations for which there is a simultaneous reliable measure of the hardness ratio by the All Sky Monitor shows that the sample covers nearly all the spectral shapes of Cyg X-1. Each observation is fitted with a generic empirical model consisting of a disk black body spectrum, a Comptonized component whose input photon shape is the same as the disk emission, a Gaussian to represent the iron line and a reflection feature. The relative strength, width of the iron line and the reflection parameter are in general correlated with the high energy photon spectral index F. This is broadly consistent with a geometry where for the hard state （low F ~ 1.7） there is a hot in- ner Comptonizing region surrounded by a truncated cold disk. The inner edge of the disk moves inwards as the source becomes softer till finally in the soft state （high F 〉 2.2） the disk fills the inner region and active regions above the disk produce the Comptonized component. However, the reflection parameter shows non-monotonic behavior near the transition region （F ~ 2）, which suggests a more complex geometry or physical state of the reflector. In addition, the inner disk temperature, during the hard state, is on average higher than in the soft one, albeit with large scatter. These inconsistencies could be due to limitations in the data and the empirical model used to fit them. The flux of each spectral component is well correlated with F, which shows that unlike some other black hole systems, Cyg X- 1 does not show any hysteresis be- havior. In the soft state, the flux of the Comptonized component is always similar to the disk one, which confirms that the ultra-soft state （seen in other brighter black hole systems） is not exhibited by Cyg X-1. The rapid variation of the Compton amplifica- tion factor with F naturally explains the absence of spec

关键词： accretion accretion disks -- X-rays: binaries

Pr(Ⅲ) and nd(Ⅲ) Absorption Spectroscopic Probe to Investigate Interaction with Lysozyme (HEW)

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2006年第6期24卷 648-652页

作者： Jignasu P.Mehta Prashant n.Bhatt Sudhindra n. misra Department of Chemistry Bhavnagar UniversityBhavnagar-364002India

Pr（ Ⅲ ） and nd（ Ⅲ ） can be utilized as absorption spectroscopic probes to investigate the interaction of biomolecules like Lysozyme （HEW） with Ca（ Ⅱ ） in-vitro ; the most abundant metal ion in the human body system. The spectroscopic techniques involving comparative absorption, absorption difference, and quantitative intensity analysis using 4f-4f transitions are utilized for changes in the inner sphere coordination pattern of Pr（ Ⅲ ） and nd（Ⅲ ） in solution as well as in solid state. The present study deals with an important biomolecule in human metabolism, that is, Lysozyme （HEW）. The absorption er-Condon the probab spectral parameters such as the oscillator strength （P）, the Judd-Ofelt （Tλ） intensity parameters, and the Slatinter electronic parameters are calculated using chi square methods. The obtained results are used to determine le geometry of the complex in the solution, the nature of the bond between Pr（Ⅲ）/nd（Ⅲ） with lysozyme, and the inner sphere coordination environment of f-f transitions. The results obtained from various experimental conditions are utilized to investigate the coordination changes in the Pr（Ⅲ）/nd（Ⅲ） complexes caused by different coordinating sites of lysozyme, normalized bite, denticity, the solvent nature, the coordination number, the nature of bond and other parameters to mimic the interaction of the Ca（ Ⅱ ） ion with such biomolecule.

关键词： absorption spectra Pr(Ⅲ), nd(Ⅲ) Lysozyme (HEW) spectral parameters rare earths

Photosynthetic Excitation Pressure Causes Violaxanthin De-epoxidation in Aging Cabbage （Brassica Oleracea L.） Leaves

在线全文

学校读者我要写书评

暂无评论

Journal of Life Sciences 2011年第3期5卷 182-191页

作者： amarendra narayan.misra Dariusz Latowski Kazimierz Strzalka Department of Biosciences and Biotechnology School of Biotechnology Fakir Mohan University Balasore 756019 India Faculty of Biochemistry Biophysics and Biotechnology Jagiellonian University Krakow 30-387 Poland

The purpose of the present studies was analysis of the age induced changes in photochemical efficiency and xanthophyils cycle pigments of the primary cabbage （Brassica oleracea L. cv. Capitata f. alba） leaves. Photochemical efficiency of photosystem Ⅱ （PS Ⅱ） was studied by a pulse amplitude modulated chlorophyll fluorescence apparatus, chlorophyll concentration was analysis spectrophotometrically and xanthophyll cycle pigments were estimated by high-pressure liquid chromatography （HPLC）. Leaf senescence was accompanied with a decrease both in chlorophylls concentration, the photochemical efficiency and rate constant for PS Ⅱ photochemistry whereas non-photochemical parameters increased. Excitation pressure （1-qP） which is a measure of relative lumen acidification increased by 1.2x in aging leaves. The maximum quantum yield of PS Ⅱ showed no significant change. The level of de-epoxidised xanthophylls increased but the concentration of mono- and di-epoxy xanthophylls decreased in aging leaves. A linear relationship between the excitation pressure and the depoxidation state of the xanthophyll cycle pigments and lutein, during the onset of senescence suggests that excitation pressure can be used as a sensor for monitoring the onset of senescence as well for the de-epoxidation state of the xanthophylls responsible for non-photochemical quenching in stressed leaves.

关键词： Cabbage (Brassica oleracea L.) violaxanthin cycle excitation pressure senescence photosynthetic parameters.

Formation of E-cyanomethamine in a nitrile rich environment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2017年第1期17卷 1-10页

作者： Shivani Alka misra Poonam Tandon Department of Mathematics & Astronomy University of Lucknow Lucknow India Department of Physics University of Lucknow Lucknow 226007 India

Recently a new molecule, cyanomethamine, has been detected towards Sagittarius B2（n）（Sgr B2（n））. Studying the formation mechanisms of complex interstellar molecules is difficult. Hence, a theoretical quantum chemical approach for analyzing the reaction mechanism describing the forma- tion of interstellar cyanomethamine through detected interstellar molecules and radicals （nCCn＋H） is discussed in the present work. Calculations are performed by using quantum chemical techniques, such as Density Functional Theory （DFT） and Mφ11er-Plesset perturbation （MP2） theory with a 6-311G（d,p） basis set, both in the gas phase and in icy grains. The proposed reaction path （nCCn＋H＋H） has exother- micity with no barrier which indicates the possibility of cyanomethamine formation in the interstellar medium.

关键词： interstellar medium: abundances general - general: extraterrestrial intelligence - mete-orites - individual: Sgr B2(n) region

Peristaltic transport of rheological fluid:model for movement of food bolus through esophagus

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2012年第3期33卷 315-332页

作者： J.C.misra S.MAITI Department of Mathematics Institute of Technical Education and ResearchSiksha 'O' Anusandhan UniversityBhubaneswar 751030India School of Medical Science and Technology & Center for Theoretical Studies Indian Institute of TechnologyKharagpur 721302India

Fluid mechanical peristaltic transport through esophagus is studied in the paper. A mathematical model has been developed to study the peristaltic transport of a rheological fluid for arbitrary wave shapes and tube lengths. The Ostwald-de Waele power law of a viscous fluid is considered here to depict the non-newtonian behaviour of the fluid. The model is formulated and analyzed specifically to explore some important information concerning the movement of food bolus through esophagus. The analysis is carried out by using the lubrication theory. The study is particularly suitable for the cases where the Reynolds number is small. The esophagus is treated as a circular tube through which the transport of food bolus takes place by periodic contraction of the esophageal wall. Variation of different variables concerned with the transport phenomena such as pressure, flow velocities, particle trajectory, and reflux is investigated for a single wave as well as a train of periodic peristaltic waves. The locally variable pressure is seen to be highly sensitive to the flow index ＂n＂. The study clearly shows that continuous fluid transport for newtonian/rheological fluids by wave train propagation is more effective than widely spaced single wave propagation in the case of peristaltic movement of food bolus in the esophagus.

关键词： non-newtonian fluid food bolus esophagus peristaltic transport flow reversal single wave wave train particle trajectory

Treatment of wheat straw using tannase and white-rot fungus to improve feed utilization by ruminants

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2014年第2期5卷 222-229页

作者： Shailendra Raghuwanshi Swati misra Rajendra Kumar Saxena Department of Microbiology University of Delhi South CampusBenito Juarez Road New Delhi 110 021India

Background： Current research to enrich cattle feed has primarily focused on treatment using white rot fungi, while there are scarce reports using the enzyme tannase, which is discussed only in reviews or in the form of a hypothesis. In this context, the aim of the present study was to evaluate the effect of tannase on wheat straw （WS） and also the effect of lyophilized tannase at concentrations of 0.1%, 0.2%, and 0.3% （w/w） on WS followed by fermentation with Ganodermo sp. for 10 d and compared in relation to biochemical parameters, crude protein （CP） content, and nutritional value by calculating the C/n ratio in order to improve the nutritional value of cattle feed. Results： Penicillium charlesii, a tannase-producing microorganism, produced 61.4 IU/mL of tannase in 54 h when 2% （w/v） tannic acid （TA） was initially used as a substrate in medium containing （% w/v） sucrose （1.0）, nanO3 （1.0）, and MgSO4 （0.08 pH, 5.0） in a 300-L fermentor （working volume 220 L）, and concomitantly fed with 1.0% （w/v） TA after 24 h. The yield of partially purified and lyophilized tannase was 5.8 IU/mg. The tannin-free myco-straw at 0.1% （w/w） tannase showed 37.8% （w/w） lignin degradation with only a 20.4% （w/w） decrease in cellulose content and the in vitro feed digestibility was 32.2%. An increase in CP content （up to 1.28-fold） along with a lower C/n ratio of 25.0%, as compared to myco-straw, was obtained. Conclusions： The use of tannin-free myco-straw has potential to improve the nutritional content of cattle feed. This biological treatment process was safe, eco-friendly, easy to perform, and was less expensive as compared to other treatment methods.

关键词： Ganoderma sp High energy cattle feed Tannase Tannin free myco-straw

A Study of Prevalence of Diabetes and Prediabetes in Patients of non-Alcoholic Fatty Liver Disease and the Impact of Diabetes on Liver Histology in Coastal Eastern India

在线全文

学校读者我要写书评

暂无评论

Journal of Diabetes Mellitus 2014年第4期4卷 290-296页

作者： Shivaram Prasad Singh Ayaskanta Singh Girish Kumar Pati Bijay misra Debasis misra Sanjib Kumar Kar Manas Kumar Panigrahi Chudamani Meher Omprakash Agrawal niranjan Rout Kaumudi Pattnaik Pallavi Bhuyan amarendra Mohapatra Department of Gastroenterology S. C. B. Medical College Cuttack India Department of Radiology Beam Diagnostics Centre Cuttack India Department of Oncopathology A. H. Regional Cancer Center Cuttack India Department of Pathology S. C. B. Medical College Cuttack India Regional Medical Research Centre Bhubaneswar India

Background and Objectives: non-alcoholic fatty liver disease (nAFLD) is more common in diabetic patients. There are limited studies on clinical, biochemical and histological features of nAFLD patients who are diabetic. The aim of the study was to determine the prevalence of diabetes and prediabetes in a cohort of nAFLD patients and to compare anthropometry, biochemical and metabolic parameters and hepatic histology of diabetic nAFLD patients with non-diabetic nAFLD patients. Methods: 515 consecutive nAFLD patients diagnosed by abdominal ultrasound and 100 healthy controls were subjected to detailed anthropometric measurements and biochemical assays including blood sugars, LFT, lipid profile and HOMA. Diabetes and prediabetes were defined according to WHO criteria. Patients were categorized and compared according to the presence or absence of diabetes. Liver biopsy was performed in 240 nAFLD patients and the liver histology was also compared between the two groups. Statistical analysis was performed on SPSS 16. Results: 124 out of the 515 (24.08%) nAFLD patients were diabetics, 118 out of 515 (22.9%) were pre-diabetics, while only 3 out of 100 controls had impaired glucose tolerance. Diabetic patients were older. nAFLD patients with diabetes had significantly higher waist circumference [98.02 ± 12.01 vs 93.89 ± 8.8, p = 0.000] as compared to the nAFLD patients without diabetes. Fasting blood sugar [124 ± 46.3 vs 90.8 ± 10.2, p = 0.000], triglyceride level [218.4 ± 17.6 vs 192 ± 9, p = 0.03] and HOMA-IR [2.6 ± 0.36 vs 1.84 ± 0.2, p nificantly higher in nAFLD-diabetes group. Hypertension [35% vs 11.7%, p = 0.000] was commoner in diabetic nAFLD patients. Histopathology in the diabetic patients revealed steatosis alone in 34.2% cases, borderline nASH in 31.4% and definite nASH in 34.2%. Fatty change alone was noted in 16.5% cases, borderline nASH in 34.1%, while 49% had definite nASH on liver biopsy of nAFLD patients without diabetes. Fibrosis was noted

关键词： Fatty Liver Diabetes Prediabetes Liver Histology Insulin Resistance Steatohepatitis

Folic acid supplementation inhibits recurrence of colorectal adenomas:A randomized chemoprevention trial

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第28期14卷 4492-4498页

作者： Richard Jaszewski Sabeena misra Martin Tobi nadeem Ullah Jo Ann naumoff Omer Kucuk Edi Levi Bradley n Axelrod Bhaumik B Patel Adhip Pn Majumdar John D Dingell Veterans Affairs Medical Center Karmanos Cancer InstituteDepartment of Internal MedicineWayne State University School of MedicineDetroitMI 48201United States

AIM: To determine whether folic acid supplementation will reduce the recurrence of colorectal adenomas, the precursors of colorectal cancer, we performed a double-blind placebo-controlled trial in patients with adenomatous polyps. METHODS: In the current double-blind, placebo-controlled trial at this VA Medical Center, patients with colorectal adenomas were randomly assigned to receive either a daily 5 mg dose of folic acid or a matched identical placebo for 3 years. All polyps were removed at baseline colonoscopy and each patient had a follow up colonoscopy at 3 years. The primary endpoint was a reduction in the number of recurrent adenomas at 3 years. RESULTS: Of 137 subjects, who were eligible after confirmation of polyp histology and run-in period to conform compliance, 94 completed the study; 49 in folic acid group and 45 in placebo group. Recurrence of adenomas at 3-year was compared between the two groups. The mean number of recurrent polyps at 3-year was 0.36 (SD, 0.69) for folic acid treated patients compared to 0.82 (SD, 1.17) for placebo treated subjects, resulting in a 3-fold increase in polyp recurrence in the placebo group. Patients below 70 years of age and those with left-sided colonicadenomas or advanced adenomas responded better to folic acid supplementation. COnCLUSIOn: High dose folic acid supplementation is associated with a signif icant reduction in the recurrence of colonic adenomas suggesting that folic acid may be an effective chemopreventive agent for colorectal neoplasia.

关键词： Folic acid Adenoma, Colorectal cancer