检索结果-南通市图书馆

Bioassay of Winter Wheat for Gibberellic Acid Sensitivity

American Journal of Plant Sciences 2013年第10期4卷 2015-2022页

作者： Alexander d. Pavlista d.pak k. santra david d. Baltensperger department of Agronomy and Horticulture University of Nebraska Panhandle Research & Extension Center Scottsbluff USA department of Soil and Crop Sciences Texas A&M University College Station USA.

Increasing winter wheat seedling growth would mak. it a better winter cover crop. Gibberellic acid (GA3) seed treatment may accomplish this by stimulating stem growth. A bioassay, mimick.ng field conditions, could determine the relative sensitivity of conventional and semi-dwarf cultivars. In growth chambers set for cool (10℃/4℃) and warm (21℃/4℃) conditions, wheat seeds were treated with 0 and 125 to 16,000 ppm GA3. The cultivars Goodstreak.(tall or conventional) and Wesley (semi-dwarf) were compared as standards. Emergence and plant height were measured. “Goodstreak. showed a significant growth promotion at 500 ppm GA3 when seeds were dipped and 2000 ppm when GA3 was applied in-furrow under both temperature regimes. “Wesley” in general required the same or a higher dose of GA3. Separately, the seeds of nine other cultivars were treated with GA3 as the standards. Based on maximum height promotion, the most sensitive cultivars under cool conditions were Goodstreak. Harry, Millenium, and Wahoo;under warm conditions, the most sensitive cultivars were Alliance, Goodstreak. Jagalene, and Millenium. In general, the least GA3 sensitive cultivars were Arrowsmith, Scout66, and Wesley. “Buck.k.n” and “InfinityCL” were intermediate. The rye cultivar Rymin also was tested and showed less sensitivity to GA3 than “Goodstreak.. When 6 benzyladenine (6BA) with GA3 was applied to “Goodstreak. and “Wesley” seed, emergence, plant height and weight, and tiller formation were reduced. Wheat cultivars will respond to GA3 and differ in the amount of GA3 needed. The results of this growth chamber study will guide subsequent field trials.

关键词： Plant Growth Regulator Gibberellin Planting Aid Cover Crop

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effect of Cold-Mediated Pretreatment on Microspore Culture in Winter and Spring Wheat

引用

American Journal of Plant Sciences 2013年第11期4卷 2259-2264页

作者： Rituraj k.ound Meenak.hi santra P. Stephen Baenziger d.pak k. santra department of Agronomy and Horticulture University of Nebraska-Lincoln Lincoln USA Panhandle Research and Extension Center University of Nebraska-Lincoln Scottsbluff USA Soil and Crop Sciences Colorado State University Fort Collins USA

Microspore culture of wheat generates completely homozygous (doubled haploid) plants in a single generation thereby reducing the time required for wheat variety development. Success of microspore culture in spring wheat is relatively higher than that in winter wheat. Cold mediated pretreatment was reported to improve response of microspore culture in wheat. The objective of the study was to determine and compare the influence of cold pretreatment on microspore culture in spring and winter wheat. Three spring (“Chris”, “Express”, and “Macon”) and three winter (“Anton”, “Antelope”, and “Camelot”) wheat cultivars were used. In cold pretreatment, excised anthers were incubated in solution B at 25°C-28°C for 4-5 days followed by cold treatment at 4°C for 5 days and were compared with the no-cold pretreatment at 25°C-28°C for 4-5 days. Isolated microspores were cultured in induction medium (MMS4) at 27°C-28°C for 25-30 days in the dark. Embryos (1-2 mm size) were transferred to regeneration medium (MMS5). Numbers of multicellular structures, transferable embryos and green plants were counted and data were used for analysis of variance using a generalized linear model. It was observed that cold pretreatment increased multicellular structures, transferable embryos and green plants in both spring and winter wheat. However, the degree of improvement was higher in spring wheat compared to winter wheat. The cultivars within spring and winter wheat responded differently. development of embryos from pro-embryos was 4-5 folds lower in winter wheat than that in spring wheat, indicating requirement of a possibly different hormonal composition in induction medium for improving embryo induction in winter wheat. This report may provide future direction of research to improve microspore culture response in winter wheat.

关键词： Androgenesis doubled Haploid Homozygosity Biotechnology Breeding

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Various admixtures to mitigate the long-term strength retrogression of Portland cement cured under high pressure and high temperature conditions

引用

Journal of Rock.Mechanics and Geotechnical Engineering 2023年第1期15卷 191-203页

作者： Jiank.n Qin Xueyu Pang Ashok.santra Guodong Cheng Hailong Li School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China k.y Laboratory of Unconventional Oil&Gas development(China University of Petroleum(East China)) Ministry of EducationQingdao266580China drilling Technology Team Aramco Americas:Aramco Research Center16300 Park Row DriveHoustonTX77084USA

In order to investigate the problem of long-term strength retrogression in oil well cement systems exposed to high pressure and high temperature(HPHT)curing conditions,various influencing factors,including cement sources,particle sizes of silica flour,and additions of silica fume,alumina,colloidal iron oxide and nano-graphene,were *** simulate the environment of cementing geothermal wells and deep wells,cement slurries were directly cured at 50 MPa and 200?*** compositions(as determined by X-ray diffraction Rietveld refinement),water permeability,compressive strength and Young’s modulus were used to evaluate the qualities of the set ***-term curing(2e30 d)test results indicated that the adoption of 6 m m ultrafine crystalline silica played the most important role in stabilizing the mechanical properties of oil well cement systems,while the addition of silica fume had a detrimental effect on strength ***-term curing(2e180 d)test results indicated that nano-graphene could stabilize the Young’s modulus of oil well cement ***,none of the ad-mixtures studied here can completely prevent the strength retrogression phenomenon due to their inability to stop the conversion of amorphous to crystalline phases.

关键词： High pressure and high temperature(HPHT) Strength retrogression Young’s modulus Water permeability Rietveld method

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Voltage-controlled NiO/ZnO p–n heterojunction diode: a new approach towards selective VOC sensing

引用

Microsystems & Nanoengineering 2020年第1期6卷 894-902页

作者： Sayan dey Swati Nag Sumita santra Samit k.mar Ray Prasanta k.mar Guha department of Electronics&Electrical Communication Engineering Indian Institute of TechnologyKharagpur 721302India department of Electrical Engineering National Institute of TechnologyAgartala 99046India department of Physics Indian Institute of TechnologyKharagpur 721302India department of Physics Belda CollegeBelda 721424India S N Bose National Centre for Basic Sciences Kolkata 700106India

Metal oxide resistive gas sensors suffer from poor selectivity that restricts their practical *** sensor arrays are used to improve selectivity which increased the system ***,we have proposed a novel NiO/ZnO-based p–n junction single-diode device for selective sensing of several volatile organic compounds(VOCs)simultaneously by tuning bias *** operating voltage was varied between 3 and 5 volts to achieve selective sensing of 2-propanol(19.1 times for 95ppm with response and recovery times of 70 s and 55s respectively‚at 3 volts),toluene(20.1 times for 95 ppm with response and recovery times of 100 s and 60 s respectively,at 4 volts),and formaldehyde(11.2 times for 95 ppm with response and recovery times of 88 s and 54s respectively,at 5 volts).A probable mechanism of the tunable selectivity with operating bias voltage due to increase in surface carriers with increasing voltage was hence put ***,this device may play an important role to develop future selective multiple VOC sensor thereby replacing standard sensor arrays.

关键词： selectivity hence thereby

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

development and Characterization of SSR Mark.rs in Proso Millet Based on Switchgrass Genomics

引用

American Journal of Plant Sciences 2014年第1期5卷 175-186页

作者： Santosh G. Rajput Tammy Plyler-Harveson d.pak k. santra Panhandle Research and Extension Center University of Ne-braska-Lincoln Scottsbluff USA

Proso millet (Panicummiliaceum) has highwater use efficiency (WUE), a short growing-season, and is highly adapted to a semi-arid climate. Genomic resources for proso millet are very limited. Large numbers of dNA mark.rs and other genomic tools in proso millet can readily be developed by using genomic resources in related grasses. The objectives of the present report were to 1) test and characterize switchgrass SSR mark.rs for use in proso millet, and 2) elucidate repeat-motifs in proso millet based on new SSR mark.r analysis. A total of 548 SSR mark.rs were tested on 8 proso millet genotypes. Out of these, 339 amplified SSR mark.rs in proso millet. This showed that 62% of the switchgrass SSR mark.rs were transferable to proso millet. Of these 339 mark.rs, 254 were highly polymorphic among the 8 proso genotypes. The resolving power of these 254 polymorphic SSR mark.rs ranged from 0.25-14.75 with an average of 2.71. The 254 polymorphic SSR mark.rs amplified 984 alleles in the ranges of 50 bp to 1300 bp. The majority of the SSR mark.rs (221 of 254) amplified dinucleotide repeats. Based on SSR mark.r analysis, AG/GA was the most abundant repeat-motifs in proso millet. Switchgrass genomic information seems to be the most useful for developing dNA mark.rs in proso millet. Mark.rs developed in this study will be helpful for link.ge map construction, mapping agronomic traits and future molecular breeding efforts in proso millet.

关键词： Millet Minor Crops Comparative Genomics Molecular Breeding

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Gibberellic Acid Promotes Early Growth of Winter Wheat and Rye

引用

American Journal of Plant Sciences 2014年第20期5卷 2984-2996页

作者： Alexander d. Pavlista david d. Baltensperger d.pak k. santra Gary W. Hergert Steve k.ox department of Agronomy and Horticulture University of Nebraska Panhandle Research & Extension Center Scottsbluff NE USA department of Soil and Crop Sciences Texas A&M University College Station TX USA Nebrask. Crop Improvement Association Lincoln NE USA

Winter wheat (Triticum aestivum) planting in Nebrask. is recommended for mid Sep but summer crops are often harvested around Oct 1. Also, weather may delay planting. Could gibberellic acid (GA3), a growth stimulant, overcome the delayed seedling growth from late planting? Irrigated field trials were planted from 2005 to 2010 applying GA3 to wheat seed of cvs. Goodstreak.and Wesley. In 2005, dip, spray and furrow GA3 applications to seed were tested. dip and spray gave similar results. Furrow application was calculated too costly. Further tests used seed dips. In 2006 to 2008 planting, wheat was planted about 15 Sep, 1 Oct and 15 Oct. Trials planted in 2007 and 2008 included winter rye (Secale cereale) cv. Rymin. Heights in mid Nov showed a reduction with later planting. When planted about 1 Oct and 15 Oct, the delayed growth of Goodstreak. compared to planting two week. earlier, was fully overcome by GA3 at 250 ppm. For Wesley, 1000 ppm GA3 was needed to nearly overcome later planting. Rymin rye gave an intermediate response between the two wheat cultivars. Spring and summer heights were not affected by GA3. Spring biomass, yield and harvested seed germination showed no GA3 effect. In later trials (planted in 2009 and 2010), the cytok.nin 6-benzyl adenine (6BA) was added to GA3 to stimulate tiller formation. In the 1st year, 6BA at 2000 ppm depressed height, weight and yield without tiller promotion. Repeating the trial with lower rates (31 - 125 ppm 6BA) did not offer an additional advantage to GA3. The results indicate that seed application of GA3 can overcome delayed growth resulting from delayed planting of winter wheat and rye under irrigation.

关键词： Plant Growth Regulator Gibberellin Planting Aid Wind Erosion Soil Erosion Cover Crop Crop Rotation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nanoparticles in mitigating gaseous emissions from liquid dairy manure stored under anaerobic condition

引用

Journal of Environmental Sciences 2019年第2期31卷 26-36页

作者： Niloy Chandra Sark.r Shafiqur Rahman Md.Saidul Borhan Parthiban Rajasek.ran Swadeshmuk.l santra Ali Ozcan Agricultural and Biosystems Engineering North Dakota State University NanoScience Technology Center University of Central Florida Burnett School of Biomedical Sciences University of Central Florida department of Chemistry University of Central Florida department of Materials Science and Engineering University of Central Florida

A number of mitigation techniques exist to reduce the emissions of pollutant gases and greenhouse gases(GHGs) from anaerobic storage of livestock.manure. Nanoparticle(NP)application is a promising mitigating treatment option for pollutant gases, but limited research is available on the mode of NP application and their effectiveness in gaseous emission reduction. In this study, zinc silica nanogel(ZnSNL), copper silica nanogel(CuSNL), and N-acetyl cysteine(NACL) coated zinc oxide quantum dot(Qdot) NPs were compared to a control lack.ng NPs. All three NPs tested significantly reduced gas production and concentrations compared to non-treated manure. Overall, cumulative gas volumes were reduced by 92.73%–95.83%, and concentrations reduced by 48.98%–99.75% for H_2S, and 20.24%–99.82% for GHGs. Thus, application of NPs is a potential treatment option for mitigating pollutant and GHG emissions from anaerobically stored manure.

关键词： Nanoparticles Greenhouse gas Hydrogen sulfide Anaerobic storage Gaseous reduction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nanocellulose,a versatile platform:From the delivery of active molecules to tissue engineering applications

引用

Bioactive Materials 2022年第3期7卷 566-589页

作者： Tejal V.Patil dinesh k.Patel Sayan deb dutta k.ya Ganguly Tuhin Subhra santra k.-Taek.Lim department of Biosystems Engineering Institute of Forest ScienceKangwon National UniversityChuncheon24341Republic of Korea Interdisciplinary Program in Smart Agriculture Kangwon National UniversityChuncheon24341Republic of Korea deptarment of Engineering design Indian Institute of TechnologyMadras600036India

Nanocellulose,a biopolymer,has received wide attention from researchers owing to its superior physicochemical properties,such as high mechanical strength,low density,biodegradability,and *** can be extracted from wide range of sources,including plants,bacteria,and *** on the extraction process and dimensions(diameter and length),they are categorized into three main types:cellulose nanocrystals(CNCs),cellulose nanofibrils(CNFs),and bacterial nanocellulose(BNC).CNCs are a highly crystalline and needle-lik. structure,whereas CNFs have both amorphous and crystalline regions in their *** is the purest form of *** nanocellulose properties can be tuned by chemical functionalization,which increases its applicability in biomedical *** review highlights the fabrication of different surface-modified nanocellulose to deliver active molecules,such as drugs,proteins,and ***-mediated delivery of active molecules is profoundly affected by its topographical structure and the interaction between the loaded molecules and *** applications of nanocellulose and its composites in tissue engineering have been ***,the review is concluded with further opportunities and challenges in nanocellulose-mediated delivery of active molecules.

关键词： Nanocellulose Chemical functionalization drug delivery Protein delivery Plasmid delivery Tissue engineering

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Immune response to an indigenously developed r-Hepatitis B vaccine in mixed population: Study of an accelerated vaccination schedule

引用

World Journal of Gastroenterology 2005年第7期11卷 1037-1039页

作者： A Chowdhury A santra CM Habibullah AA k.an J k.runak.ramaiah TSA k.shore AVR Raju S Lahiri dept of Gastroenterology Center for Liver disease Biological E.Limited

AIM: To establish the safety and efficacy of an indigenously developed r-hepatitis B vaccine using an accelerated schedule and to highlight the social awareness and commitment in preventing the spreading of hepatitis B virus infection. METHOdS: The study was a multicentric, double blind, randomized (3:1) study using three doses of vaccine immunization schedule (20μg for those above 10 years old and 10 μg for those below 10 years old) on d 0, 30 and 60. One hundred and sixty-six subjects were enrolled (87 males and 76 females aged 5-35 years). The main outcome measure was assessment of immunogenicity and safety. RESULTS: A 100% seroconversion response was observed on the 30th d after the 1st injection in both the experimental groups. The sero-protection data reported a 41.2-65.6% response on the 30th d after the 1st injection and reached 100% on the 60th d. descriptive statistical analysis showed a geometric mean titer value of 13.77 mIU/mL in the test (BEVAC) group and 10.95 mlU/mL in the commercial control (ENGERIX-B) group on the 30th d after the 1st injection. The response on the 60th d showed a geometric mean titre value (GMT) of 519.84 mlU/mL in the BEVAC group and 475.46 mlU/mL in the ENGERIX-B group. On the 90th d, the antibody titer response was observed to be 2627.58 mlU/mL in the BEVAC group and 2272.72 mlU/mL in the ENGERIX-B group. Two subjects in each group experienced pains at injection site after the first vaccination. A total of six subjects in both groups experienced a solicited adverse reaction, which included pains, swelling and redness at the injection site, three subjects in the group-B had a pain at the injection site after the third dose. No other serious adverse events occurred and no dose-related local or general symptoms were observed during the study. CONCLUSION: The vaccine is safe, efficacious and immunogenic in comparison with the well documented ENGERIX-B.

关键词： Hepatitis B r-Hepatitis B Vaccines Immune response Accelerated vaccination schedule

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hydrocephalic cerebrospinal fluid flowing rotationally with pulsatile boundaries:A mathematical simulation of the thermodynamical approach

引用

Theoretical & Applied Mechanics Letters 2023年第1期13卷 79-86页

作者： Hemalatha Balasundaram Senthamilselvi Sathyamoorthi Unai Fernandez-Gamiz Samad Noeiaghdam Shyam Sundar santra department of Mathematics VISTASVels UniversityZamin PallavaramChennaiTamilnadu Nuclear Engineering and Fluid Mechanics department University of the Basque Country UPV/EHUNieves Cano 1201006Vitoria-GasteizSpain Industrial Mathematics Laboratory Baikal School of BRICSIrkutsk National Research Technical UniversityIrkutsk664074Russia department of Applied Mathematics and Programming South Ural State UniversityLenin prospect 76Chelyabinsk454080Russia department of Mathematics Applied Science ClusterUniversity of Petroleum and Energy StudiesDehradunUttarakhand248007India department of Mathematics JIS College of EngineeringKalyaniWest Bengal 741235India

To study the k.nematics of flow rate and ventricular dilatation,an analytical perturbation approach of hydrocephalus has been *** research provides a comprehensive investigation of the characteristics of cerebrospinal fluid(CSF)flow and pressure in a hydrocephalic *** influence of hydrocephalic CSF,flowing rotationally with realistic dynamical characteristics on pulsatile boundaries of subarachnoid space,was demonstrated using a nonlinear controlling system of *** analytical perturbation method of hydrocephalus has been developed to investigate the biomechanics of fluid flow rate and the ventricular *** this paper presents a detailed analysis of CSF flow and pressure dynamics in a hydrocephalic *** was elaborated with a nonlinear governing model of CSF to show the influence of hydrocephalic CSF,flowing rotationally with realistic dynamical behaviors on pulsatile boundaries of subarachnoid *** accordance with the suggested model,the elasticity factor changes depending on how much a porous layer,in this case the brain parenchyma,is *** was improved to include the relaxation of internal mechanical stresses for various perturbation orders,modelling the potential plasticity of brain *** initial geometry that was utilised to create the framework.of CSF with pathological disease hydrocephalus and indeed the output of simulations using this model were compared to the actual progression of ventricular dimensions and shapes in *** to this observation,the non-linear and elastic mechanical phenomena incorporated into the current model are probably *** modelling of ventricular dilation at a normal pressure may benefit from the existence of a valid model whose parameters approximate genuine mechanical characteristics of the cerebral cortex.

关键词： Brain parenchyma Cerebrospinal fluid Hydrocephalus Ventricular elasticity Intracranial pressure differences

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：