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1149篇 您的检索式:作者名="Siddique"
    题名 作者 年代 出处 被引量
1菜薹转录组中SSR信息与可用性分析显示文摘利用菜薹转录组分析检测到48 975条unigene(38.17 Mb)序列数据,运用MIcro SAtellite(MISA)工具发现其中具有1-6个核苷酸重复类型的SSR位点11 879个,SSR位点发生频率为1/3.2 kb(312.5/Mb)。6种SSR位点类型中主要为1-3个核苷酸重复,占总SSR位点数的99.01%,其中单、二和三核苷酸类型分别为41.11%、28.23%和29.67%。发现重复序列的基序58个,重复次数在5-23之间,其中出现频率高的基序主要有A/T、AG/CT、AT/AT、AC/GT、AAG/CTT和AGG/CCT。重复序列长度在10-60 bp之间,大多小于20 bp,大于20 bp的仅有7.9%(938个SSR位点)。设计出676对具有潜在多态性的SSR引物组合,从中随机抽取30对引物进行PCR扩增验证其可用性,发现22对引物在4份菜薹种质中的扩增产物条带清晰稳定,其中12对引物具有多态性。李荣华 王直亮 陈静芳 夏岩石 郭培国 张华 Kadambot Siddique 2016园艺学报2016,43,9:20
2碱处理提取竹黄纤维的响应曲面优化显示文摘采用响应曲面设计(Box-Behnken设计)优化竹纤维的提取工艺。以碱和脂肪醇聚氧乙烯醚(JFC)渗透剂对竹片进行沸煮,并结合机械碾压提取竹黄纤维,以碱浓度为0.5%~0.7%、JFC浓度为0.1%~0.3%、沸煮时间为1.5~2.5h为考察因素,采用响应曲面法,以竹纤维断裂强度、提取率、直径和摩擦系数为响应值,建立数学模型,获得综合性能最佳工艺。并采用扫描电镜观察不同工艺处理的竹纤维的纵向结构。结果表明:最优提取工艺为碱浓度为0.7%、JFC浓度为0.3%、沸煮时间为2.5h,此时纤维的综合性能最佳,拉伸断裂强度为386.25MPa,直径为191.79μm,摩擦系数为0.206,与响应曲面预测值(断裂强度为405.08 MPa,直径为175.59μm,摩擦系数为0.191)接近。响应曲面法优化得到的竹纤维性能较好,并能很好地预测试验结果,断裂强度与预测值偏差4.6%,摩擦系数与预测值偏差7.8%,直径与预测值偏差9.2%。SEM表明:碱处理、JFC处理和沸煮时间对纤维表面的胶质有影响,碱浓度为0.5%、JFC浓度为0.3%、沸煮时间为2.5h时有利于竹纤维表面胶质的去除。林天扬 王春红 YOUSFANI Sheraz Hussain Siddique 王威 钱晓明 徐志伟 2018复合材料学报2018,35,4:18
3A review on therapeutic potential of Nigella sativa:A miracle herb显示文摘Nigella sativa(N.sativa)(Family Ranunculaceae)is a widely used medicinal plant throughout the world.It is very popular in various traditional systems of medicine like Unani and Tibb,Ayurveda and Siddha.Seeds and oil have a long history of folklore usage in various systems of medicines and food.The seeds of N.saliva have been widely used in the treatment of different diseases and ailments.In Islamic literature,it is considered as one of the greatest forms of healing medicine.It has been recommended for using on regular basis in Tibb-e-Nabwi(Prophetic Medicine).It has been widely used as antihypertensive,liver tonics,diuretics,digestive,anti-diarrheal,appetite stimulant,analgesics,anti-bacterial and in skin disorders.Extensive studies on N.sativa have been carried out by various researchers and a wide spectrum of its pharmacological actions have been explored which may include antidiabetic,anticancer,immunomodulator,analgesic,antimicrobial,anti-inflammatory,spasmolytic,bronchodilator,hepato-protective,renal protective,gaslro-prolective,antioxidant properties,etc.Due to its miraculous power of healing,N.sativa has got the place among the top ranked evidence based herbal medicines.This is also revealed that most of the therapeutic,properties of this plant are due to the presence of thymoquinone which is major bioactive component of the essential oil.The present review is an effort to provide a detailed survey of the literature on scientific researches of pharmacognostical characteristics,chemical composition and pharmacological activities of the seeds of this plant.Aftab Ahmad Asif Husain Mohd Mujeeb Shah Alam Khan Abul Kalam Najmi Nasir Ali Siddique Zoheir A.Damanhouri Firoz Anwar 2013Asian Pacific Journal of Tropical Biomedicine2013,3,5:16
43种观赏草苗期对干旱胁迫的响应及抗旱性评价显示文摘通过自然失水胁迫试验,探究了狼尾草(Peuuisetum alopecuroides)、蓝羊茅(Festuca glauca ‘Freddy’)、细茎针茅‘马尾’(Stipa tenuissima ‘Pony Tails’)苗期对干旱胁迫形态特性和生理特性的响应变化,并对其抗旱性进行综合分析评价。结果显示,在干旱胁迫过程中,狼尾草的土壤含水量下降速率小于其他两者。随着干旱胁迫时间的延长,3种观赏草幼苗的株高变化量和叶绿素含量均呈下降趋势;脯氨酸含量、丙二醛含量均呈上升趋势;超氧化物歧化酶活性表现为先增大后减小的变化趋势;狼尾草的可溶性蛋白含量呈先增大后减小的变化趋势,蓝羊茅和细茎针茅则呈先减小后增大的变化趋势。采用隶属函数法对3种观赏草苗期表现进行抗旱性综合评价,其抗旱能力强弱表现为细茎针茅‘马尾’>蓝羊茅‘Freddy’>狼尾草。王竞红 陈鹏 陈艾 田静瑶 MUHAMMAD Siddique 李彦雪 2019草业科学2019,36,5:16
5An experimental study exploring the influencing factors for ultrasonic-assisted extraction of flavonoid compounds from leaves of Amorpha fruticosa L.显示文摘In this paper,the ultrasonic-assisted extraction process of flavonoid compounds from leaves of Amorpha fruticosa is optimized.In single factor experiments,solid/liquid ratios,ultrasonic power,ethanol concentrations and extraction cycles were experimental factors.Box–Behnken central composite design and RSM analyzed the effects of the four factors on the yield of total flavonoids.The optimal extraction parameters were solid/liquid ratio 1:50 g/mL,ultrasonic power 316 W,ethanol concentration 50%,4 extraction cycles.In the optimized condition,the estimated value of the regression model was 66.6456 mg/g while the measured value was 66.4329 mg/g.Jingyao Tian Siddique Muhammad Ai Chen Peng Chen Jinghong Wang Chengwu Yang Hui Yuan Zhensheng Wang 2019Journal of Forestry Research2019,30,5:14
6Ag/Ag_3PO_4/g-C_3N_4三元复合光催化剂的制备及其可见光驱动下的光催化活性增强(英文)显示文摘报道了一种新型Ag/Ag3PO4/g-C3N4三元复合光催化剂的制备及其半导体界面处的快速载流子分离所引起的光催化活性的显著增强效应.通过X射线衍射,扫描电子显微镜,紫外-可见吸收光谱以及光致发光光谱等就其晶体结构、形貌、组分、光学吸收以及载流子的快速分离行为进行了表征与分析.以罗丹明B作为模型化合物分子,研究发现,所制备的Ag/Ag3PO4/g-C3N4三元复合光催化剂在可见光照射下表现出比Ag3PO4以及Ag3PO4/g-C3N4二元催化剂更为优异的光催化活性.研究认为,Ag3PO4表面尺寸约为40 nm的Ag纳米粒子在可见光下受激所产生的等离子表面共振效应以及Ag3PO4与g-C3N4界面处所形成的类似异质结结构对所制备的Ag/Ag3PO4/g-C3N4三元复合光催化剂光催化活性的显著增强起到重要作用.沈凯 Mohammed Ashraf Gondal Rashid Ghulam Siddique 施珊 王斯琦 孙江波 徐庆宇 2014催化学报2014,35,1:14
7Effect of precut sphincterotomy on post-endoscopic retrograde cholangiopancreatography pancreatitis:A systematic review and meta-analysis显示文摘AIM:To conduct a systemic review and meta-analysis to investigate the role of early precut technique.Multiple randomized controlled trails(RCTs)have reported conflicting results of the early precut sphincterotomy.METHODS:MEDLINE/PubMed,EMBASE,Cochrane Central Register of Controlled Trials and Database of Systematic Reviews,and recent abstracts from major conference proceedings were searched(June 2013).Randomized and non-randomized studies comparing early precut technique with prolonged standard methods were included.Pooled estimates of post-endoscopic retrograde cholangiopancreatography(ERCP)pancreatitis(PEP),cannulation and adverse events were analyzed by using odds ratio(OR).Random and fixed effects models were used as appropriate.Publication bias was assessed by funnel plots.Heterogeneity among studies was assessed by calculating I2 measure of inconsistency.RESULTS:Seven randomized and seven non-randomized trials met inclusion criteria.Meta-analysis of RCTs showed a decrease trend for PEP with early precut sphincterotomy but was not statistically significant(OR=0.58;95%CI:0.32-1.05;P=0.07).No heterogeneity was noted among the studies with I2 of 0%.CONCLUSION:Early precut technique for common bile duct cannulation decreases the trend of post-ERCP pancreatitis.Abhishek Choudhary Jessica Winn Sameer Siddique Murtaza Arif Zainab Arif Ghassan M Hammoud Srinivas R Puli Jamal A Ibdah Matthew L Bechtold 2014World Journal of Gastroenterology2014,20,14:13
8Sustainable Resource Use in Enhancing Agricultural Development in China显示文摘Jianbo Shen Fusuo Zhang Kadambot H.M. Siddique 2018Engineering2018,4,5:10
9不同菜心品种叶绿素荧光参数日变化的研究显示文摘了解菜心光能利用效率的规律性,可为具优良光合性状菜心品种的选育提供参考。据此,本研究选用在二份耐热性强和二份耐热性弱的菜心品种作为研究对象,探讨了这些品种的叶绿素荧光参数的日变化规律。结果表明:随着光强和温度的上升和下降的日变化,四份菜心材料的初始荧光(Fo)、相对可变荧光(VJ)和单位反应中心热耗散能量(DIo/RC)出现先升后降的趋势,而最大荧光(Fm)、光能转化效率(Fv/Fm)、光化学性能指数(PIABS)则出现先降后升的情况;除Fo的最大峰值在四份材料中均在13:00时外,耐热性强的材料其余参数的最大或最小峰值出现在光照强度最大的13:00时且变化幅度较小,而在耐热性弱的材料中这些值的变化幅度大且出现在日最高温度的14:00。另外,随着光强和温度的降低,各荧光参数又逐渐向初始水平恢复,但耐热性强的菜心品种的恢复速率高于耐热性弱的菜心品种。这一结果表明叶绿素荧光参数可考虑作为评价菜心材料耐热性强弱的一个参考指标。王直亮 陈静芳 林静怡 夏岩石 李荣华 郭培国 张华 李光光 郑岩松 Kadambot Siddique 2017分子植物育种2017,15,9:9
10竹原纤维的分级提取及其性能显示文摘为探究不同竹龄及不同取材部位竹原纤维性能的变异规律,以不同竹龄、不同部位的慈竹为原料,采用物理-化学结合的方法提取竹原纤维,并分别测定竹原纤维的化学组成、纤维的表面形貌、纤维的密度、吸湿性能、拉伸强度。结果表明:相同部位竹原纤维,随竹龄的增加,纤维的密度先增大后减小,纤维的回潮率先减小后增大;相同竹龄竹原纤维,随着距地高度的增加,纤维密度增加,回潮率先稍有降低后升高。3年生慈竹梢部纤维密度最大,为1.70 g/cm3,4年生的基部纤维密度最小,为1.51 g/cm3。3年生慈竹中部纤维回潮率最低,为12.94%,其不同部位竹原纤维拉伸强度较为稳定,4年生中部竹原纤维拉伸强度最大,为787.42 MPa。王春红 陈祯 李园平 YOUSFANI Sheraz Hussain Siddique 陈雅颂 2017纺织学报2017,38,11:9
11稻壳纤维粒径和掺量分数对水泥复合材料性能的影响显示文摘以稻壳纤维(Rice husk fiber,RHF)为增强材料,以水泥为基体,制备了RHF/水泥基复合材料。研究了粒径对RHF在水泥基体中分散性能的影响;并以RHF粒径和掺入质量比为考察因素,采用响应曲面法,以RHF/水泥基复合材料的密度、抗折强度、含水率、吸水率和导热系数为响应值,建立数学模型,对RHF/水泥基复合材料的成型工艺进行优化设计。结果表明:RHF的粒径越小,在水泥基体中分散性能越好,粒径为150μm的RHF分散系数达到最大值,为0.981;响应曲面模型分析表明RHF的粒径为150μm、掺入质量为水泥质量的3%时,RHF/水泥基复合材料的性能达到最优,此时RHF/水泥基复合材料的密度为1 559.26kg/m3,抗折强度为9.38 MPa,含水率为7.05%,吸水率为16.71%,导热系数为0.50 W/(m·K),达到了建筑行业标准JC/T411—2007的要求。王春红 支中祥 任子龙 SHERAZ Hussain Siddique Yousfani 王威 钱晓明 2018复合材料学报2018,35,6:8
12下垫面覆盖类型变化对城市热岛的影响——以北京市朝阳区为例显示文摘【目的】快速发展的城市化进程改变了下垫面的性质和结构,从而影响了城市的热量平衡,导致城市热岛效应蔓延。研究城市下垫面变化及其对城市热岛的影响,对缓解城市热环境、减少社会经济损失有重要意义。【方法】本文利用2002—2017年北京市朝阳区Landsat系列遥感影像计算研究区域归一化植被指数(NDVI)变化,并基于大气校正法利用Landsat热红外波段进行地表温度(LST)反演,进一步对所获地表温度进行归一化处理;同时利用2002—2017年北京市朝阳区谷歌全色卫星影像,基于DeepLabv3+网络利用深度学习对朝阳区下垫面分类并分析其动态变化。【结果】(1)朝阳区15年间平均地表温度呈上升趋势,城市热岛逐年加剧;至2017年,区内不再存在单一热岛中心,而转为复杂的镶嵌式结构、多中心分布。(2)15年间不透水面面积共减少71.02 km2,降幅20.98%;水域面积共减少2.53 km2,降幅24.12%;植被面积共增加73.54 km2,增幅56.57%。(3)对地表温度与下垫面类型动态变化相关性进行分析表明,地表温度与不透水面面积呈正相关,与植被面积呈负相关关系。(4)从总量来看,2012—2017年朝阳区与城市热岛效应成负相关关系的植被与水域面积总量增加明显,但城市热岛效应不降反增。【结论】植被和水域对城市热岛效应的缓解作用在用地强度、建筑密度和人类活动不断增长的前提下逐渐变得有限。在现有城市发展模式下,朝阳区地表温度将继续上升,城市热岛进一步加剧。李膨利 Muhammad Amir Siddique 樊柏青 黄华国 刘东云 2020北京林业大学学报2020,42,3:8
13Identification of Iron Oxides Qualitatively/Quantitatively Formed during the High Temperature Oxidation of Superalloys in Air and Steam Environments显示文摘Mssbauer spectroscopy has been used to study the morphology of iron oxides formed during the oxidation of superalloys,such as SS-304L(1.4306S),Incoloy-800H,Incoloy-825,UBHA-25L,Sanicro-28 and Inconel-690,at 1200℃ exposed in air and steam environments for 400 h.The basic aim was to identify and compare the iron oxides qualitatively and quantitatively,formed during the oxidation of these alloys in two environments.The behaviour of alloy UBHA-25L in high temperature oxidation in both environments indicates that it has good oxidation resistance especially in steam,whereas Sanicro-28 has excellent corrosion resistance in steam environment.In air oxidation of Inconel-690 no iron oxide,with established Mssbauer parameters,was detected.M. Siddique N. Hussain M. Shafi 2009Journal of Materials Science & Technology2009,25,4:6
14气候变化下旱区农业生态系统的可持续性显示文摘农业生产是将自然资源不断转化为农产品的过程。简单的说就是将阳光、空气、水和土壤等无机资源转化为可以供人类消费的有机产物。农业生态系统必须对全球气候变化、市场竞争、自然环境的恶化、经济等政策法规和人民的需求等因素做出灵活的应对策略,同时还要保证自然生态系统的稳定性。在发展中国家,李凤民 Kadambot H. M Siddique Neil C Turner 欧阳志云 Guijun Yan 熊友才 2011生态学报2011,31,9:5
15Clayey soil stabilization using alkali-activated volcanic ash and slag显示文摘Lime and Portland cement are the most widely used binders in soil stabilization projects.However,due to the high carbon emission in cement production,research on soil stabilization by the use of more environmentally-friendly binders with lower carbon footprint has attracted much attention in recent years.This research investigated the potential of using alkali-activated ground granulated blast furnace slag(GGBS)and volcanic ash(VA)as green binders in clayey soil stabilization projects,which has not been studied before.The effects of different combinations of VA with GGBS,various liquid/solid ratios,different curing conditions,and different curing periods(i.e.7 d,28 d and 90 d)were investigated.Compressive strength and durability of specimens against wet-dry and freeze-thaw cycles were then studied through the use of mechanical and microstructural tests.The results demonstrated that the coexistence of GGBS and VA in geopolymerization process was more effective due to the synergic formation of N-A-S-H and C-(A)-S-H gels.Moreover,although VA needs heat curing to become activated and develop strength,its partial replacement with GGBS made the binder suitable for application at ambient temperature and resulted in a remarkably superior resistance against wet-dry and freeze-thaw cycles.The carbon embodied of the mixtures was also evaluated,and the results confirmed the low carbon footprints of the alkali-activated mixtures.Finally,it was concluded that the alkali-activated GGBS/VA could be promisingly used in clayey soil stabilization projects instead of conventional binders.Hania Miraki Nader Shariatmadari Pooria Ghadir Soheil Jahandari Zhong Tao Rafat Siddique 2022Journal of Rock Mechanics and Geotechnical Engineering2022,14,2:5
16Scalable and controlled self-assembly of aluminum-based random plasmonic metasurfaces显示文摘Subwavelength metal-dielectric plasmonic metasurfaces enable light management beyond the diffraction limit.However,a costeffective and reliable fabrication method for such structures remains a major challenge hindering their full exploitation.Here,we propose a simple yet powerful manufacturing route for plasmonic metasurfaces based on a bottom-up approach.The fabricated metasurfaces consist of a dense distribution of randomly oriented nanoscale scatterers composed of aluminum(Al)nanohole-disk pairs,which exhibit angle-independent scattering that is tunable across the entire visible spectrum.The macroscopic response of the metasurfaces is controlled via the properties of an isolated Al nanohole-disk pair at the nanoscale.In addition,the optical field confinement at the scatterers and their random distribution of sizes result in a strongly enhanced Raman signal that enables broadly tunable excitation using a single substrate.This unique combination of a reliable and lithography-free methodology with the use of aluminum permits the exploitation of the full potential of random plasmonic metasurfaces for diagnostics and coloration.Radwanul Hasan Siddique Jan Mertens Hendrik Hölscher Silvia Vignolini 2017Light(Science & Applications)2017,6,1:5
17乌拉草/棉/维纶复合纱线的开发与性能显示文摘针对乌拉草/棉/维纶赛络纺包芯纱存在毛羽较多和条干较差等问题,加装导纱器引入外包缠纱,设计一种改善其条干和减少毛羽的新型纺纱方法:改进型赛络菲尔纺。对影响纱线性能较大的纱线捻系数与导纱间距进行了实验,并以断裂强度、断裂伸长率、毛羽指数和条干均匀度为性能评价指标,对改进型赛络菲尔纺制备的乌拉草/棉/维纶复合纱的工艺进行模糊综合评价。结果表明:捻系数对纱线性能影响顺序依次为400、380、360、340;改进型赛络菲尔纺在单纱间距为10 mm,捻系数为400时,复合纱的综合性能最好,与传统赛络菲尔纺工艺制备的包芯纱对比,毛羽指数下降了73.49%,条干不匀率减小了29.05%。王利军 王春红 龙碧璇 YOUSFANI Sheraz Hussain Siddique 徐磊 2017纺织学报2017,38,12:4
18芸薹属SSR标记在菜薹中的通用性及其应用显示文摘以4份遗传背景差异较大的菜薹种质为试材,检测133对芸薹属SSR引物在菜薹中的PCR扩增效果,以期发现适用于菜薹的SSR标记。结果表明:有50对引物在4份菜薹种质中表现出较好的通用性,其扩增产物多在100~350bp,多态性数目在1~4,共91个多态性位点。在此基础上,利用在“四九-19号菜心”和“3T6”中具有多态性的40对SSR引物,对130份以“四九-19号菜心”和“3T6”为亲本建立的F6重组自交系群体进行基因分型,构建了一个具有10个遗传群、总长度为641.39cM的菜薹遗传连锁图。研究结果可为今后菜薹遗传多样性、基因定位和分子标记辅助育种提供理论参考。陈静芳 李荣华 王直亮 夏岩石 郭培国 Kadambot SIDDIQUE 2016北方园艺2016,,15:4
19Nutrient dynamics associated with leaf litter decomposition of three agroforestry tree species (Azadirachta indica, Dalbergia sissoo, and Melia azedarach) of Bangladesh显示文摘Azadirachta indica A. Juss, Dalbergia sissoo Roxb., and Melia azedarach L. are little studied species in nutrient return capabili- ties from leaf litter decomposition to maintenance of the soil fertility despite their importance in agroforestry practices of Bangladesh. A leaf litter decomposition experiment was conducted using a litterbag tech- nique to assess the nutrient return efficiency of these species. The de- composition rate of leaf litter was highest for M. azedarach and lowest for D. sissoo. Rainfall and temperature of study sites showed a signifi- cant (p<0.05) positive relationship with the rate of leaf litter decomposi- tion. The highest decay constant was observed for M. azedarach (6.67). Nitrogen and Phosphorus concentration in leaf litter showed a decreased trend sharply at the end of the first month, whereas rapid decrease of Potassium concentration was reported within 10 days. Conversely, higher concentration of nutrient was observed at the later stages of decomposi- tion. All three species showed a similar pattern of nutrient release (K > N > P) during the decomposition process of leaf litter. Among the studied species, D. sissoo was best in terms of N and P return and A. indica was best in terms of K return.Mahmood Hossain Mohammad Raqibul Hasan Siddique Md. Saidur Rahman Md. Zaber Hossain Md. Mahedi Hasan 2011Journal of Forestry Research2011,22,4:4
20第二届生态系统评估与管理(EAM)国际会议综述显示文摘自2005年联合国《千年生态系统评估》发布以来,旱区农业生态系统评估与管理研究越来越受到世界各国的广泛关注和重视。综述了2010年7月19日至25日在兰州大学举行的第二届生态系统评估与管理(Ecosystem assessment and management,EAM)国际会议28场特邀专家报告,围绕'气候变化与旱区农业生态系统管理'主题,分别从生态系统时空格局、全球变化生态学、植物逆境适应机制、植物与土壤关系和生态系统管理五个方面进行总结,旨在探讨全球气候变化条件下如何提高干旱与半干旱脆弱农业生态系统生产力和可持续性发展的创新理论研究。对生态系统评估与管理的未来发展趋势和目标进行了探讨,并对该会议将来的举办和组织形式提出了建议。李朴芳 赵旭喆 程正国 Kadambot H. M Siddique Neil C Turner 李凤民 Guijun Yan 熊友才 2011生态学报2011,31,9:3
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