检索结果-南通市图书馆

American Journal of Analytical Chemistry 2013年第5期4卷 238-251页

作者： disha J. Vyas Bharat A. Makwana keyur d. bhatt Vinod K. Jain department of Chemistry School of Sciences Gujarat University Ahmedabad India

Synthetic resin, Amberlite XAd-4 was linked covalently with the third generation supramolecule, octa-O-methoxy resorcin [4] arene through -N=N-group to form chelating resin, which has been characterized and effectively used for the separation and preconcentration of metal ions such as Ni(II), Cu(II), Zn(II) and Cd(II). Critical parameters such as pH, flow rate, sorption capacity, breakthrough studies, distribution coefficient, preconcentration factor, concentration of eluting agents responsible for quantitative extraction of metal ions were optimized. The synthesized resin showed good binding affinity towards Ni(II), Cu(II), Zn(II) and Cd(II) under selective pH conditions. Good breakthrough capacity and fast exchange kinetics of the resin lead to effective separation of metal ions from their binary and ternary mixture by column method on the basis of pH and eluting agents. The resin could be reused for about 8 -10 cycles. The proposed method having the analytical data with the relative standard deviation (RSd) 2% and with recoveries of analytes higher than 98%, reflects upon the reproducibility and reliability of the method which has been successfully applied in the separation and determination of Ni(II), Cu(II), Zn(II) and Cd(II) ions in synthetic, natural and ground water samples.

关键词： Separation Preconcentration Amberlite XAd-4 Octa--O-Methoxy Resorcin Arene Solid Phase Extraction

Variation in Polyphenolics and Antioxidant Activity of Traditional Apple Cultivars from West Himalaya,Uttarakhand

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2018年第4期4卷 151-157页

作者： BAHUKHANdI Amit dHYANI Praveen bhatt Indra d. RAWAL Ranbeer S. G.B.Pant National Institute of Himalayan Environment and Sustainable development Almora 263643UttarakhandIndia

Apple(Malus × domestica) is largely known for polyphenolic and antioxidant properties; however, systematic investigation in the apple growing in the Indian Himalayan region is not carried out. The present study therefore, attempts to quantify polyphenolics and antioxidant activities in three traditional apple cultivars namely 'Benoni', 'Fanny' and 'Rymer' growing at different locations of Uttarakhand(west Himalaya), *** revealed that phenolic(0.94–7.00 mg GAE·g^(-1)FW), flavonoid(1.02–9.86 mg QE·g^(-1)FW), flavonol(0.77–6.92 mg CE·g^(-1) FW), tannin(15.49–37.99 mg TAE·g^(-1) FW) and antioxidant activity(ABTS, 3.10–67.36; dPPH, 4.99–14.06; FRAP, 4.70–39.21 mmol AAE·kg^(-1)FW) varied significantly among the cultivars and maximum content was recorded in Rymer fruits of Mukhwa location. Altitude showed significant(P d(r = 0.843), flavonol(r = 0.812), ABTS(r = 0.856) and FRAP activity(r = 0.830). Based on the results, it is concluded that among three cultivars, Rymer is one of the most promising sources of polyphenolic content and antioxidant activity and therefore, recommended for mass plantation at suitable locations in Uttarakhand for harnessing maximum potential.

关键词： apple traditional cultivar antioxidant polyphenolics West Himalaya

A catalyst-free new polyol method synthesized hot-pressed Cu-doped Bi2S3 nanorods and their thermoelectric properties

在线全文

学校读者我要写书评

暂无评论

Nano Research 2016年第11期9卷 3291-3304页

作者： Tarachand Vikash Sharma Ranu bhatt Vedachalaiyer Ganesan Gunadhor Singh Okram UGC-dAE Consortium for Scientific Research Indore 452001 India Technical Physics division Bhabha Atomic Research Centre Mumbai 400085 India

This is the first report on the thermoelectric properties of a catalyst-free polyol method used to prepare stoichiometric Bi2-xCuxS3 samples, x = 0.1, 0.2, 0.3, 0.4, via hot pressing. Various systematic approaches to arrive at in their stoichiometric compositions are explored precisely with introduction of excess precursor of S. X-ray diffraction data analysis using Rietveld refinement confirms a polyhedral orthorhombic crystal structure with a space group Pnma, in contrast to Pbnm reported earlier. Raman data further substantiates this. X-ray photoelectron spectroscopy confirms the valence states of the constituent elements （Bi^3＋, Cu^2＋, and S^2-） and energy dispersive X-ray analysis corroborates their compositions. The particle sizes of the pure Bi2S3 nanoparticles were 20, 35, and 82 nm as determined from the Scherrer formula, atomic force microscopy, and dynamic light scattering, respectively. Their transmission electron microscopy image shows rod-like nanostructures elongated in the 〈010〉 direction with an average diameter of 23 nm and a length of several hundreds of nanometers. A 34% improvement in the thermoelectric figure of merit is observed for Bi.6Cu0.4S3 as compared to pure Bi2S3 at 300 K.

关键词： Bi2S3 polyol nanorods thermoelectrics

Physical properties of lunar craters

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3期17卷 23-38页

作者： Maitri P. Joshi Kushal R bhatt Rajmal Jain Shri Maneklal M.Patel Institute of Sciences and Research Kadi Sarva VishwavidhyalayaGandhinagar-382015India

The surface of the Moon is highly cratered due to impacts of meteorites, asteroids, comets and other celestial objects. The origin, size, structure, age and composition vary among craters. We study a total of 339 craters observed by the Lunar Reconnaissance Orbiter Camera （LROC）. Out of these 339 craters, 214 craters are known （named craters included in the IAU Gazetteer of Planetary Nomenclature） and 125 craters are unknown （craters that are not named and objects that are absent in the IAU Gazetteer）. We employ images taken by LROC at the North and South Poles and near side of the Moon. We report for the first time the study of unknown craters, while we also review the study of known craters conducted earlier by previous researchers. Our study is focused on measurements of diameter, depth, latitude and longitude of each crater for both known and unknown craters. The diameter measurements are based on considering the Moon to be a spherical body. The LROC website also provides a plot which enables us to measure the depth and diameter. We found that out of 214 known craters, 161 craters follow a linear relationship between depth （d） and diameter （d）, but 53 craters do not follow this linear relationship. We study physical dimensions of these 53 craters and found that either the depth does not change significantly with diameter or the depths are extremely high relative to diameter （conical）. Similarly, out of 125 unknown craters, 78 craters follow the linear relationship between depth （d） and diameter （d） but 47 craters do not follow the linear relationship. We propose that the craters following the scaling law of depth and diameter, also popularly known as the linear relationship between d and d, are formed by the impact of meteorites having heavy metals with larger dimension, while those with larger diameter but less depth are formed by meteorites/celestial objects having low density material but larger diameter. The craters with very high depth and with very small d

关键词： Moon meteorites meteors meteoroids- planets and satellites: surfaces

Eu(Ⅲ) Indirect Probe to Investigate Interaction of dOPA (3,4,di-Hydroxyphenylalanine) and dopamine (3,4-dihydroxy Phenyl Ethyl Amine) Using Electrochemical Methods

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 653-658页

作者： Prashant N bhatt Trupti V Pathak Jignasu P Mehta G.Ramchandraiha department of Chemistry Bhavnagar University Bhavnagar-364002 India Central Salt and Marine Chemical Research Institute Waghavadi RoadBhavnagar-364002India

Eu（ Ⅲ ） can be utilized as an indirect electrochemical probe to investigate the interaction of bio-molecules such as dOPA and dopamine with Ca（ Ⅱ ） in vitro. The interaction of dOPA and dopamine with Eu（ Ⅲ ）-Eu（ Ⅱ ） redox pair was investigated by electrochemical techniques. Both the neurotransmitters are structurally related and undergo interaction with Eu （Ⅲ ）. Eu （ Ⅲ ） coordinates with dOPA and dopamine through five-member chelate tings via carboxylic oxygen and amino nitrogen. The electrode kinetic parameters viz, transfer coefficient （αna）, diffusion coefficient （d）, forward heterogeneous rate constant （ k^0 fh） were evaluated for Eu（ Ⅲ ）-dOPA/Eu（ Ⅲ ）-dopamine. The results obtained were used to investigate the nature of interaction of Eu （Ⅲ） with muhi-donor biomolecules. The possible mechanism was also proposed.

关键词： electrochemistry of Eu ( Ⅲ ) chrono techniques electrochemistry of Eu ( Ⅲ )-neurotransmitters solutionstudy rare earths

Optimization of enzymatic hydrolysis of pigeon pea for cooking quality of dhal

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2014年第5期7卷 123-132页

作者： V.P.Sangani N.C.Patel V.M.bhatt P.R.davara d.K.Antala department of Processing and Food Engineering College of Agricultural Engineering and TechnologyJunagadh Agricultural UniversityJunagadhGujaratIndia Anand Agricultural University AnandGujaratIndia

Cooking quality of dehusked splits is influenced by the dehulling method,in particular,by the pre-milling *** effects of four enzymatic hydrolysis parameters,i.e.,enzyme concentration(20-60 mg/100 g dry matter),incubation time(3-15 h),incubation temperature(40-60℃)and tempering water pH(4.0-6.0)on cooking time of pigeon pea dhal were optimized using response surface *** kinds of enzymes,i.e.,xylanase,pectinase,and cellulas were used in combination for enzymatic pre-treatment.A quadratic model satisfactorily described the dehulling efficiency with high value for the coefficient of determination R^(2)(0.9062).It predicted a minimum cooking time of 21.91 min at enzyme concentration of 37.8 mg/100 g dry matter,incubation time 8.69 min,incubation temperature 48.5℃ and pH 5.49 of tempering *** time at optimum condition was observed to be 21.50 min and the predicted values of cooking time showed 2.19% deviation from the experimental *** of the study revealed that cooking time of enzyme treated dhal could be decreased by 19.77% compared to the oil treated dhal.

关键词： pigeon pea enzymatic hydrolysis cooking quality enzymatic pre-treatment dehulling response surface methodology

Carbon disulphide Induced Sensitivity Changes of Rat Anococcygeus Muscle to Noradrenaline(NA)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 1993年第3期6卷 223-230页

作者： d.N.GANdHI H.VENKATAKRISHNA-bhatt department Department of Neurobehavioural Toxicology National Institute of Occupational Health(ICMRMeghani NagarAhmedabad 380016Indiaof Neurobehavioural Toxicology National Institute of Occupational Health(ICMRMeghani NagarAhmedabad 380016India

The sensitivity of rat anococcygeus muscle to noradrenaline (NA) was reduced following carbon disulphide (CS2) pretreatment. Preparations incubated in excess Ca++ (4.2 mrnol-L-1) or Zero Ca++ (***-L-1) media showed decrease in sensitivity to NA. Reserpinization failed to induce supersensitivity to NA in any Mg+ + concentration in the media. Reserpinized tissue in Mg++ free media with EdTA showed increased sensitivity while decreased sensitivity and maximum response to NA in Mg+ + (1.2 mmol-L-1) and excess Mg+ + (3.6mmol-1 ') concentration of the medium. In the presence of EdTA, the inhibition observed with CS2 in excess Mg+ + (3.6m mol-L-1') medium was comparatively much less in both non-reserpinized and reserpinized preparations. In normal Ca++ and its deficient medium decrease in sensitivity to CS2 and the relevant maximum response to NA were observed. In excess Ca + +, the CS2 effect depressed corresponding to its maximal response to NA. Thus CS2 may be inhibiting responses to NA by interfering with Ca+ + utilization.

关键词： NA

Simultaneous analysis of allopurinol and oxypurinol using a validated liquid chromatography–tandem mass spectrometry method in human plasma

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 2017年第1期7卷 56-62页

作者： dhiraj M. Rathod keyur R. Patel Hiren N. Mistri Arvind G. Jangid Pranav S. Shrivastav Mallika Sanyal department of Chemistry Kadi Sarva Vishwavidyalaya Gandhinagar Ahmedabad 382015 India Bioanalytical Research department Accutest Research Lab Bodakdev Ahmedabad 380059 India department of Chemistry School of Sciences Gujarat University Ahmedabad 380009 India department of Chemistry St. Xavier's College Navrangpura Ahmedabad 380009 India

The present study describes a simple, reliable and reproducible liquid chromatography–tandem mass spectrometry method(LC–MS/MS) for the simultaneous determination of allopurinol and its active metabolite,oxypurinol in human plasma for a pharmacokinetic/bioequivalence study. After protein precipitation(PPT) of100 μL plasma sample with 1.0% formic acid in acetonitrile, the recovery of the analytes and allopurinol-d2 as an internal standard ranged from 85.36% to 91.20%. The analytes were separated on Hypersil Gold(150 mm×4.6 mm, 5 μm) column using 0.1% formic acid-acetonitrile(98:2, v/v) as the mobile *** was done using electrospray ionization in the positive mode. The calibration concentration range was established from 60.0 to 6000 ng/m L for allopurinol and 80.0–8000 ng/m L for oxypurinol. Matrix effect in human plasma, expressed as IS-normalized matrix factors ranged from 1.003 to 1.030 for both the analytes. The developed method was found suitable for a clinical study with 300 mg allopurinol tablet formulation in healthy subjects.

关键词： Allopurinol Oxypurinol Liquid chromatography–tandem mass spectrometry Bioequivalence study

Glycemic Indices of Multiple Oral Nutritional Supplements: A Randomized Cross-Over Study in Indian Adults

在线全文

学校读者我要写书评

暂无评论

Food and Nutrition Sciences 2023年第10期14卷 941-962页

作者： deepti Khanna Jaladhi bhatt Jayanti Gupta Simran Sethi Parth Joshi Manoj Pareek divya Agrawal Hindustan Unilever Limited R&D Department Gurugram India Independent Biostatistician & Researcher Mumbai India Cliantha Research Ahmedabad India

Background: A randomized cross-over study was conducted to assess the glycemic index (GI) of seven Oral Nutritional Supplements (ONSs). These ONSs are designed to support the nutritional requirements of different age-groups, physiological states, or health conditions among Indian adults. Methods: The study had two phases viz., phase1 (n = 18) studied two ONSs: A1 and B1 and phase 2 (n = 20) studied five ONSs: A2, B2, C2, d2 & E2. The subjects were healthy, non-diabetic adults, aged between 20 - 44 years with a mean Body Mass Index of 21.2 ± 1.52 kg/m2 (Phase 1) and 21.0 ± 1.45 kg/m2 (Phase 2). All these ONSs were compared with reference drinks (glucose). The carbohydrates in one serving of each ONS were matched to carbohydrates from 25 grams of glucose following ISO 2010 guidelines. Capillary blood was assessed for blood glucose response at baseline, 15, 30, 45, 60, 90 and 120 minutes. GI was calculated as the incremental area under the curve (iAUC) for the test drinks and expressed as a percentage of the average iAUC from glucose. Results: Phase 1 indicated that the high fiber diabetes-specific nutrition supplement A1 with higher protein (23% energy), higher fat (25% energy) and reduced carbohydrates (40% energy) had a significantly (p = 0.002) lower GI [34 (±6)] as compared to B1 [63 (±7)] (protein 19%, fat 7% and carbohydrates 60% energy) even with similar amount (22%) and type of fiber. Phase 2 reported that all test products [A2 (32 ± 5), B2 (37 ± 4), C2 (31 ± 5), d2 (31 ± 5) and E2 (55 ± 4)] had a low GI. As compared to phase 1, ONSs in phase 2 had lower fiber content (1.6% - 4.6% energy). Conclusion: The glycemic index of oral nutrition supplements is influenced not only by their fiber content, but also by the overall macronutrient composition including protein (≥17% energy), fat (≥10% - 27% energy) and carbohydrates (40% - 57.5% energy).

关键词： Glycemic Index Oral Nutritional Supplements Incremental Area under the Curve diabetes

Effects of mother tree ages, different rooting mediums, light conditions and auxin treatments on rooting behaviour of dalbergia sissoo branch cuttings

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Forestry Research 2011年第1期22卷 53-57页

作者： Bhupendra Singh Rajendra Yadav B. P. bhatt department of Forestry Post Box No-59 H.N.B. Garhwal University Srinagar Garhwal - 246 174 Uttarakhand India Chhattisgarh Minor Forest Produce Federation A-25 VIP Estate Khamhardih Shankar Nagar Raipur- 492 007. ICAR Research Complex for NEH Region Nagaland Centre Medziphema- 797 106 Nagaland India

dalbergia sissoo Roxb. is one of the promising multipurpose tree species of South Asia. Most of the plantations of d. sissoo from seeds are facing severe threats due to the die-back disease, which ultimately causes death of this potential tree-species within a few months. Vegetative propagation could avoid the die-back disease. Thirty mother trees of different age-groups of d. sissoo were selected for evaluating the rooting behaviour of branch cuttings from d. sissoo as influenced by auxins （IAA or IBA at 100, 200, 500 mg·L^-1）, ages of mother trees （10, 4 and 2 years old） and different environment conditions, i.e., different mediums （soil and sand） or light conditions （in shade and open condition）. The results show that application of IAA and IBA induced more numbers of cuttings （collected from 10-year-old mother trees） to root compared to control. Branch cuttings of d. sissoo collected from 10-year-old mother trees and planted in soil bed in open conditions had 100.0% of cuttings to root in IAA （100 mg·L^-1） and IBA （200 mg·L^-1） treatments. Both rooting medium （Soil and sand） influenced significantly （p〈0.05） on rooting response of branch cuttings. Soil medium was found to achieve maximum no. of branch cuttings to root, compared to sand medium.

关键词： dalbergia sissoo hormonal treatments rooting medium shading vegetative propagation branch cutting