检索结果-南通市图书馆

Maize Genic Male-Sterility Genes and Their Applications in Hybrid Breeding: Progress and Perspectives

Molecular Plant 2019年第3期12卷 321-342页

作者： Xiangyuan wan Suowei Wu Ziwen li Zhenying dong Xueli An Biao Ma Youhui Tian Jinping li Biology and Agriculture Research Center University of Science and Technology BeijingBeijing 100024China Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding Beijing International Science and Technology Cooperation Base of Bio-Tech BreedingBeijing Solidwill Sci-Tech Co.Ltd.Beijing 100192China

As one of the most important crops, maize not only has been a source of the food, feed, and industrial feedstock for biofuel and bioproducts, but also became a model plant system for addressing fundamental questions in genetics. Male sterility is a very useful trait for hybrid vigor utilization and hybrid seed production. The identification and characterization of genic male-sterility (GMS) genes in maize and other plants have deepened our understanding of the molecular mechanisms controlling anther and pollen development, and enabled the development and efficient use of many biotechnology-based male-sterility (BMS) systems for crop hybrid breeding. In this review, we summarize main advances on the identification and characterization of GMS genes in maize, and con struct a putative regulatory network controlling maize anther and pollen development by comparative genomic analysis of GMS genes in maize, Arabidopsis, and rice. Furthermore, we discuss and appraise the features of more than a dozen BMS systems for propagating male-sterile lines and producing hybrid seeds in maize and other plants. Finally, we provide our perspectives on the studies of GMS genes and the development of novel BMS systems in maize and other plants. The continuous exploration of GMS genes and BMS systems will enhance our understanding of molecular regulatory networks controlling male fertility and greatly facilitate hybrid vigor utilization in breeding and field production of maize and other crops.

关键词： genic male sterility anther and pollen development biotechnology-based male-sterility system hybrid seed production maize

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

Polymeric nanocomposites loaded with fluoridated hydroxyapatite Ln^(3+)(Ln = Eu or Tb)/iron oxide for magnetic targeted cellular imaging

引用

Cancer Biology & Medicine 2015年第3期12卷 175-183页

作者： Jie Pan Wei-Jiao liu Chao Hua li-li wang dong wan Jun-Bo Gong State Key Laboratory of Hollow Fiber Membrane Materials and Processes School of Environmental and Chemical EngineeringTianjin Polytechnic University Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Science Department of Chemical Engineering School of Chemical Engineering and Technology Tianjin University

Objective： To fabricate polymeric nanocomposites with excellent photoluminescence, magnetic properties, and stability in aqueous solutions, in order to improve specificity and sensitivity of cellular imaging under a magnetic field. Methods： Fluoridated LnS＋-doped HAP （Ln3＋-HAP） NPs and iron oxides （lOs） can be encapsulated with biocompatible polymers via a modified solvent exaction/evaporation technique to prepare polymeric nanocomposites with fluoridated Ln3＋-HAP/iron oxide. The nanocomposites were characterized for surface morphology, fluorescence spectra, magnetic properties and in vitro cytotoxicity. Magnetic targeted cellular imaging of such nanocomposites was also evaluated with confocal laser scanning microscope using A549 cells with or without magnetic field. Results： The fabricated nanocomposites showed good stability and excellent luminescent properties, as well as low in vitro cytotoxicity, indicating that the nanocomposites are suitable for biological applications. Nanocomposites under magnetic field achieved much higher cellular uptake via an energy-dependent pathway than those without magnetic field. Conclusion： 1tie nanocomposites fabricated in this study will be a promising tool for magnetic targeted cellular imaging with improved specificity and enhanced selection.

关键词： Cancer cellular imaging nanocomposites magnetic targeted hydroxyapatite (HAP) doped with rare earth

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

Measuring the space between vagina and rectum as it relates to rectocele

引用

World Journal of Gastroenterology 2009年第24期15卷 3051-3054页

作者： Jin liu li-dong Zhai Yun-Sheng li wan-Xiang liu Rui-Hua wang Department of Anatomy and Neurobiology Tianjian Medical University Tianjin 300070 China Radiology Division Tianjin Hongqiao Hospital Tianjin 300131 China

AIM:To measure the normal space between the posterior wall of the vagina and the anterior wall of the respectively rectum using computed tomography(CT) and reveal its were relationship to rectocele. METHODS:A total of twenty female volunteers without rectocele were examined by CT *** performed a middle level continuous horizontal pelvic scan from the upper part to the lower part and collected the measurement data to analyze the results using t-test. RESULTS:Twenty volunteers were enrolled in the study. The space between the posterior wall of the vagina and the anterior wall of the rectum was measured at three levels(upper 1/3,middle,lower 1/3 level of vagina). The results showed that the space from the posterior wall of the vagina to the anterior wall of the rectum at the upper 1/3 level and the middle level was 3.896 ±0.3617 mm and 4.6575±0.3052 mm,respectively. When the two groups of data were compared,we found the space at the upper 1/3 level was shorter than at the middle level(Plinical diagnosis and functional outcomes of rectocele repair.

关键词： Measurement Space Rectocele Computed tomography

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

Correlation analyse between thyroid hormone levels and severity of schizophrenia symptoms

引用

World Journal of Psychiatry 2025年第1期15卷 63-71页

作者： Qi-Hui Jiang Wei-dong Gong Department of Endocrinology and Metabolism Hengyang Central HospitalHengyang 421000Hunan ProvinceChina Breast Tumor Surgical Outpatient Hengyang Central HospitalHengyang 421000Hunan ProvinceChina

BACKGROUND The imbalance of hormone levels in the body is closely related to the occurrence and progression of schizophrenia,especially thyroid *** To study the relationship between triiodothyronine(T3),thyroxine(T4),free T3(FT3),free T4(FT4),thyroid stimulating hormone(TSH)and *** In this study,100 schizophrenia patients were selected from our hospital between April 2022 and April *** clinical data were analyzed *** on the Positive and Negative Syndrome Scale(PANSS)score,patients were divided into mild(1-3 points,n=39),moderate(4 points,n=45),and severe groups(5-7 points,n=16).Additionally,55 healthy individuals served as a control *** blood samples were collected to measure T3,T4,FT3,FT4,TSH,and cortisol concentrations,analyzing their relationship with PANSS *** The serum levels of T3,FT3,FT4,TSH and cortisol in the schizophrenia group were lower than those in the control group(P<0.05).With the increase of the severity of the disease,the concentrations of T3 and T4 decreased,while the con-centrations of TSH and cortisol increased(P<0.05).The concentrations of TSH and cortisol were positively correlated with the PANSS score,while T3 and T4 were negatively correlated with the PANSS score(P<0.05).The receiver ope-rating characteristic curve results showed that T3,T4,TSH,and cortisol had good efficacy in the diagnosis of *** results showed that decreased T3 level,decreased T4 level,decreased TSH level and increased cortisol level may be independent risk factors for *** Thyroid hormone levels are associated with the severity of schizophrenia symptoms,which can provide new solutions for the diagnosis and treatment of schizophrenia.

关键词： Thyroid hormone Schizophrenia Symptom severity Positive and Negative Syndrome Scale score Cortisol

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

Solution chemistry of carbonate minerals and its effects on the flotation of hematite with sodium oleate

引用

International Journal of Minerals,Metallurgy and Materials 2017年第7期24卷 736-744页

作者： dong li wan-zhong Yin Ji-wei Xue Jin Yao Ya-feng Fu Qi liu School of Resources and Civil Engineering Northeastern University College of Zijin Mining Fuzhou University Department of Chemical and Materials Engineering University of Alberta

The effects of carbonate minerals（dolomite and siderite） on the flotation of hematite using sodium oleate as a collector were investigated through flotation tests, supplemented by dissolution measurements, solution chemistry calculations, zeta-potential measurements, Fourier transform infrared（FTIR） spectroscopic studies, and X-ray photoelectron spectroscopy（XPS） analyses. The results of flotation tests show that the presence of siderite or dolomite reduced the recovery of hematite and that the inhibiting effects of dolomite were stronger. Dissolution measurements, solution chemistry calculations, and flotation tests confirmed that both the cations（Ca^（2＋） and Mg^（2＋）） and CO_3^（2＋）ions dissolved from dolomite depressed hematite flotation, whereas only the 23CO-ions dissolved from siderite were responsible for hematite depression. The zeta-potential, FTIR spectroscopic, and XPS analyses indicated that Ca^（2＋）, Mg^（2＋）, and CO_3^（2-）（HCO_3^-） could adsorb onto the hematite surface, thereby hindering the adsorption of sodium oleate, which was the main reason for the inhibiting effects of carbonate minerals on hematite flotation.

关键词： hematite carbonate minerals solution chemistry sodium oleate flotation

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

Outcomes of different lines of keratoconus management in a tertiary eye center in north China

引用

International Journal of Ophthalmology(English edition) 2022年第4期15卷 568-575页

作者： Jing Zhang Xian-li Du Lei wan Yan-ling dong li-Xin Xie Eye Institute of Shandong First Medical University Qingdao 266071Shandong ProvinceChina State Key Laboratory Cultivation Base Shandong Provincial Key Laboratory of OphthalmologyQingdao 266071Shandong ProvinceChina School of Ophthalmology Shandong First Medical UniversityQingdao 266071Shandong ProvinceChina

AIM: To evaluate the treatment selections and outcomes of keratoconus and discuss the grading treatment of ***: Medical records of 1162 patients(1863 eyes) with keratoconus treated with rigid gas permeable(RGP), corneal collagen crosslinking, and keratoplasty were reviewed. The patients were grouped according to the CLEK Study. The advanced group was further divided into a 60 D group. The best-corrected visual acuity(BCVA) and topographic data before and after treatment were ***: In the 761 eyes with steep K60 D, surgical management accounted for 90.6%. A total of 618 eyes had improved BCVA at the final fol ow-up point(>18 mo, P52 D, the BCVA and topographic astigmatism outcomes showed no differences among the treatment groups. When steep K was >60 D, the BCVA in eyes treated with LKP was worse than those with steep Klity of future keratoplasty in RGP was higher in advanced group(14.8% vs 7.0%, P=0.027). The incidence of steep K progression in the corneal collagen crosslinking(CXL) group was higher in advanced group(32.3% vs 8.5%, P=0.007). Multivariate logistic regression revealed the following related factors for treatment options: steep K [odds ratio(OR)=1.208, 95%CI: 1.052-1.387], TA(OR=1.171, 95%CI: 1.079-1.270), and TCT(OR=0.978, 95%CI: 0.971-0.984). The level of steep K, TA, and TCT all relates to the treatment choices of both keratoplasty and non-keratoplasty, while steep K provided the highest diagnostic accuracy(AUC=0.947, P<0.001).CONCLUSION: Steep K is an important grading treatment indicator. When steep K is <52 D, RGP lenses should be recommended. It i

关键词： keratoconus management rigid gas permeable corneal collagen crosslinking keratoplasty

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

讨论用ICP-AES测定土壤和沉积物时钛对钴的干扰

引用

环境科技 2015年第4期28卷 54-56页

作者：金燕张竹青王霞于洋洋万立东吉林省环境监测中心站吉林长春1300112 吉林大学环境与资源学院吉林长春130000

ICP-AES是土壤和沉积物中重金属理想的分析方法,很多元素通过四酸法全消解后用其测定都可以得到理想的结果。通过实验发现经过四酸法全消解土壤或沉积物,用ICP-AES同时测定多个元素时,元素钴的测定结果偏高,有时结果偏高近1.5倍。元素钛... 详细信息

ICP-AES是土壤和沉积物中重金属理想的分析方法,很多元素通过四酸法全消解后用其测定都可以得到理想的结果。通过实验发现经过四酸法全消解土壤或沉积物,用ICP-AES同时测定多个元素时,元素钴的测定结果偏高,有时结果偏高近1.5倍。元素钛在228.616 nm(钴的第1谱线)处有一个强干扰,造成对元素钴的测定结果偏高,通过实验发现元素钛对钴的干扰会随着钛和钴含量比例不同而不同。用三酸处理样品,用火焰原子吸收方法做样,对于土壤和沉积物中元素钴的测定可以得到较好的结果。

关键词：钴电感耦合等离子体原子发射光谱法钛原子吸收光谱法

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

人不是物:社会认知的稽古维新

引用

心理学报 2025年第1期57卷 173-189页

作者：董达陈巍绍兴文理学院心理学系大脑、心智与教育研究中心浙江绍兴312000 中国人民大学哲学与认知科学交叉平台北京100080

当代社会认知的理论版图可分为经典概念工具箱与正在与之对抗的新概念工具两部分。经考证,理论论和模拟论等经典概念工具集中诞生于1980年代的美国认知科学界,可以被视为1956认知革命蔓延至社会心理学领域的产物,而新概念工具可以被视... 详细信息

当代社会认知的理论版图可分为经典概念工具箱与正在与之对抗的新概念工具两部分。经考证,理论论和模拟论等经典概念工具集中诞生于1980年代的美国认知科学界,可以被视为1956认知革命蔓延至社会心理学领域的产物,而新概念工具可以被视为与第二代认知革命相适合的替代理论。历史上,社会心理学接受了认知主义的“物”的抽象认知原理,也全盘接受了它带来的理论负荷,即对“人”的感知被还原为对“物”的感知,并且隶属于后者。然而,基于“物”的抽象认知原理始终无法与社会认知的以“人”为本的实践经验相结合,也未能实现该领域的自治。事实上,这一理论困难并非一直存在于“社会认知”的历史路径中,至少在以Heider为标志性人物的1950年代早期社会认知中便不是这样。Heider“人不是物”理论体系在个体层面上包括知觉实在论、事件归因和生命性−非生命性范畴区分三个部分,但是第三个理论部件彼时囿于作者主题侧重、证据不足、技术匮乏等多种原因未能完成。结合当代来自演化和比较的、行为和发展的以及神经通路假设的新证据,通过重新发掘并最终完整构建了“人不是物”论题,尝试为当代社会认知理论困难提供一个建设性意见。

关键词：社会认知人的感知认知革命生命性主体间性

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

Risk assessment of maize drought disaster in southwest China using the Environmental Policy Integrated Climate model

引用

Journal of Mountain Science 2016年第3期13卷 465-475页

作者： JIA Hui-cong PAN dong-hua li Jing ZHANG wan-chang Ghulam RASUL State Key Laboratory of Remote Sensing Science Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences Beijing 100094 China National Disaster Reduction Center of China Ministry of Civil Affairs of the People's Republic of China Beijing 100124 China Satellite Environment Center Ministry of Environmental Protection Beijing 100094 China Pakistan Meteorological Department Islamabad 44000 Pakistan

The East Asian monsoon has a tremendous impact on agricultural production in China. An assessment of the risk of drought disaster in maize-producing regions is therefore important in ensuring a reduction in such disasters and an increase in food security. A risk assessment model, EPIC（Environmental Policy Integrated Climate） model, for maize drought disasters based on the Erosion Productivity Impact Calculator crop model is proposed for areas with the topographic characteristics of the mountainous karst region in southwest China. This region has one of the highest levels of environmental degradation in China. The results showed that the hazard risk level for the maize zone of southwest China is generally high. Most hazard index values were between 0.4 and 0.5,accounting for 47.32% of total study area. However,the risk level for drought loss was low. Most of the loss rate was ＆lt;0.1, accounting for 96.24% of the total study area. The three high-risk areas were mainlydistributed in the parallel ridge–valley areas in the east of Sichuan Province, the West Mountain area of Guizhou Province, and the south of Yunnan *** results provide a scientific basis and support for the reduction of agricultural drought disasters and an increase in food security in the southwest China maize zone.

关键词： Vulnerability Risk assessment Drought EPIC model Maize Southwest China

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

Protective Effect of Isoflurane and Sevoflurane on Ischemic Neurons and Expression of Bcl-2 and ICE Genes in Rat Brain

引用

Biomedical and Environmental Sciences 2006年第2期19卷 143-146页

作者： SHAO-dong ZHANG JING ZHAI HUI ZHANG HONG wan DE-ZHI li Biochemical Department Beijing Neurosurgical Institute Beijing 100050 China

Objective To study the protective effect of volatile anesthetics, isoflurane and sevoflurane, on ischemic neurons after cerebral ischemia-reperfusion in rats and its possible molecular mechanism. Methods Rat cerebral ischemia-reperfusion model was developed by occlusion of the middle cerebral artery （MCA） and bilateral common carotid arteries （CCAs） 1 h after reperfusion. Using flow cytometry （FCM） and Northern blot hybridization, we calculated the number of apoptotic bodies and detected the expression of bcl-2 mRNA and interleukin-113 converting enzyme （ICE） mRNA. Results The apoptotic bodies in hippocampus analyzed by FCM peaked at appeared 24 h after reperfusion, and decreased about 54% and 40%, respectively, after treatment with isoflurane and sevoflurane, as compared with ischemic group. There was no significant difference in the expression of bcl-2 mRNA and ICE mRNA between the inhaled anesthetic groups and ischemic group in hippocampus 24 h after MCA/CCAs occlusion. Conclusion Isoflurane and sevoflurane partially inhibit apoptosis but have no significant effect on the expression of bcl-2 and ICE genes.

关键词： Isoflurane Sevoflurane Apoptosis bcl-2 ICE

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：