维普中文期刊产品整合服务
129篇 您的检索式:作者名="Perveen"
    题名 作者 年代 出处 被引量
1Characterization of Embryonic Stages through Variations in the Egg's Contents in Spodoptera fitura显示文摘F. Perveen H. Ahmed F. M. Abbasi N. Y. Siddiqui A. Gul 2010Journal of Agricultural Science and Technology2010,4,5:5
2Responses of soil microbial communities and functions associated with organic carbon mineralization to nitrogen addition in a Tibetan grassland显示文摘Alpine grasslands with a high soil organic carbon(SOC)storage on the Tibetan Plateau are experiencing rapid climate warming and anthropogenic nitrogen(N)deposition;this is expected to substantially increase the soil N availability,which may impact carbon(C)cycling.However,little is known regarding how N enrichment influences soil microbial communities and functions relative to C cycling in this region.We conducted a 4-year field experiment on an alpine grassland to evaluate the effects of four different rates of N addition(0,25,50,and 100 kg N ha^-1 year^-1)on the abundance and community structure(phospholipid fatty acids,PLFAs)of microbes,enzyme activities,and community level physiological profiles(CLPP)in soil.We found that N addition increased the microbial biomass C(MBC)and N(MBN),along with an increased abundance of bacterial PLFAs,especially Gram-negative bacterial PLFAs,with a decreasing ratio of Gram-positive to Gram-negative bacteria.The N addition also stimulated the growth of fungi,especially arbuscular mycorrhizal fungi,reducing the ratio of fungi to bacteria.Microbial functional diversity and activity of enzymes involved in C cycling(β-1,4-glucosidase and phenol oxidase)and N cycling(β-1,4-N-acetyl-glucosaminidase and leucine aminopeptidase)increased after N addition,resulting in a loss of SOC.A meta-analysis showed that the soil C/N ratio was a key factor in the response of oxidase activity to N amendment,suggesting that the responses of soil microbial functions,which are linked to C turnover relative to N input,primarily depended upon the soil C/N ratio.Overall,our findings highlight that N addition has a positive influence on microbial communities and their associated functions,which may reduce soil C storage in alpine grasslands under global change scenarios.Ruyi LUO Jiafa LUO Jianling FAN Deyan LIU Jin-Sheng HE Nazia PERVEEN Weixin DING 2020Pedosphere2020,30,2:3
3Effects of Sublethal Doses of Chlorfluazuron on Embryogenesis in Spodoptera fitura显示文摘F. Perveen 2011Journal of Agricultural Science and Technology2011,5,2:2
4Isolation and structure elucidation of three glycosides and a long chain alcohol from Polianthes tuberosa Linn 显示文摘Kha K M Perveen S Ayattollahi S A 2002Nat Prod Lett2002,16,4:1
5Apolipoprotein E polymorphism and cardiovascular disease : A HuGE review 显示文摘Eichner JE Dunn ST Perveen G 2002Am J Epidemio12002,155,6:1
6Coats' disease of the retina (unilateral retinal telangiectasis) caused by somatic mutation in the NDP gene: a role for norrin in retinal angiogeuesis显示文摘Black GC Perveen R Bonshek R 1999Hum Mol Genet1999,8,:1
7Domain disruption and mutation of the bZIP transcription factor, MAF, associated with cataract, ocular anterior segment dysgenesis and coloboma显示文摘Jamieson RV Perveen R Kerr B 2002Hum Mot Genet2002,11,:1
8Epimers from the leaves of Calophyllum inophyllum 显示文摘ALI M S MAHMUD S PERVEEN S 1999Phytochemistry1999,50,:1
9Verticilliside, a new flavone C-glucoside from Enicostemma verticillatum显示文摘Erum Jahan Shagufta Perveen Abdul Malik 2009Journal of Asian Natural Products Research2009,,3:1
10Role of serotonin-1A receptors in restraint-induced behavioral deficits and adaptation to repeated restraint stress in rats显示文摘Haleem DJ Samad N Perveen T 2007Int J Neurosci2007,117,:1
11Role of temperature and hosts (Sitotroga cereallela and Corcyra cephalonica) egg age on the quality production of Trichogramma chilonis显示文摘Perveen F Sultan R Ul-Haque E 2012Arthropods2012,1,4:1
12Epimers from the leaves of Calophyllum inophyllum显示文摘Ali M S Mahmud S Perveen S 1999Phytochemistry1999,50,8:1
13Effects of Sublethal Doses of Chlorfluazuron on Pupal-testis in the Common Cutworm, Spodoptera fitura (F,) (Lepidoptera: Noctuidae)显示文摘F. Perveen S. A. Mehmood S. Yasmin 2011Journal of Agricultural Science and Technology(A)2011,1,6:1
14Guaiacin A and B from the leaves of Guaiacum officinale显示文摘Ahmad VU Perveen S Bano S 1989Planta Med1989,55,3:1
15Antioxidant,anti- glycation and anti-inflammatory activities of phenolic constituents from Cordia sinensis显示文摘Al-Musayeib N Perveen S Fatima I 2011Molecules2011,16,10:1
16Pollen flora of Pakistan : 36, Flacourtiaceae显示文摘Perveen A Qaiser M 2000 2000Palaistan J Bot2000,32,1:1
17Effects of bismuth on structural and dielectric properties of cobalt-cadmium spinel ferrites fabricated via micro-emulsion route显示文摘Spinel ferrites have a significant role in high-tech applications.In the present work nano-crystalline ferrites having general formula Co0.5Cd0.5BixFe2-xO4 with(x=0.0,0.05,0.1,0.15,0.2,and 0.25)are synthesized via micro-emulsion route.Powder x-ray diffraction(XRD)studies discover the FCC spinel structure.Crystalline size is calculated in a range of 11 nm-15 nm.Lattice parameter calculations are reduced due to its substitution which leads to the exchange of large ionic radius of Fe^3+for small ionic radius of Bi^3+.The x-ray density is analyzed to increase with doping.Fourier transform infrared spectroscopy(FTIR)is performed to analyze absorption band spectra.The two absorption bands are observed in a range of 400 cm^-1-600 cm^-1,and they are the characteristic feature of spinel structure.Thermo-gravimetric analysis(TGA)reveals the total weight loss of nearly 1.98%.Dielectric analysis is carried out by impedance analyzer in a frequency span from 1 MHz to 3 GHz by using the Maxwell Wagner model.Dielectric studies reveal the decrease of dielectric parameters.The alternating current(AC)conductivity exhibits a plane behavior in a low frequency range and it increases with the applied frequency increasing.This is attributed to the grain effects in a high frequency range or may be due to the reduction of porosity.Real and imaginary part of impedance show the decreasing trend which corresponds to the grain boundary action.The imaginary modulus shows the occurrence of peak that helps to understand the interfacial polarization.Cole-Cole graph shows a single semicircle which confirms that the conduction mechanism is due to the grain boundaries at low frequency.Dielectric studies reveal the applicability of these ferrites in high frequency equipment,microwave applications,high storage media,and semiconductor devices.Furhaj Ahmed Sheikh Muhammad Khalid Muhammad Shahzad Shifa H M Noor ul Huda Khan Asghar Sameen Aslam Ayesha Perveen Jalil ur Rehman Muhammad Azhar Khan Zaheer Abbas Gilani 2019Chinese Physics B2019,28,8:1
18Bodymass index -predictor of outcome after cor- onary artery bypass grafting显示文摘Shahabuddin S Perveen S Furnaz S 2013Asian Cardiovasc Thorae Ann2013,21,2:1
19Coats' disease of the retina(unilateral retinal telangiectasis) caused by somatic mutation in theNDP gene: a role for norrin in retinal angiogenesis 显示文摘Black GC Perveen R Bonshek R 1999Hum MolGenet1999,8,11:1
20lnhibitors of apoptotic proteins: new targets for anticancer therapy 显示文摘Saleem M Qadir MI Perveen N 2013Chem Biol Drug Des2013,82,3:1
返回顶部 每页显示:
共7页 首页 上一页 第1页 下一页 末页 /7 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费