检索结果-南通市图书馆

Do egg cell-secreted aspartic proteases promote gamete attachment?

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2023年第1期65卷 3-6页

作者： Xuecheng Zhang Xiaobo Yu Ce Shi Thomas Dresselhaus meng-xiang sun State Key Laboratory of Hybrid Rice College of Life Sciences Wuhan UniversityWuhan 430072 China Bamboo Diseases and Pest Control and Resources Development Key Laboratory of Sichuan Province College of Life Science Leshan Normal UniversityLeshan 614000 China Cell Biology and Plant Biochemistry University of Regensburg Regensburg 3193053 Germany

During the double fertilization process of flowering plants(angiosperms),pollen tubes transport a pair of immobile sperm cells toward and inside the embryo sac for fusion with egg and central cell,***–female gamete interactions during fertilization are critical for reproductive success and seed development,and thus have interested biologists for *** to animals,little is known about gamete interaction mechanisms in angiosperms.

关键词： gamete fertilization interested

A female in vivo haploid-induction system via mutagenesis of egg cell-specific peptidases

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2023年第2期16卷 471-480页

作者： Xuecheng Zhang Ce Shi Siling Li Bo Zhang Pan Luo Xiongbo Peng Peng Zhao Thomas Dresselhaus meng-xiang sun State Key Laboratory of Hybrid Rice College of Life SciencesWuhan UniversityWuhan 430072China Hubei Hongshan Laboratory Wuhan 430070China Cell Biology and Plant Biochemistry University of RegensburgRegensburgGermany

Crop breeding schemes can be significantly accelerated by using(doubled)haploid *** vivo haploid induction has been applied in plant breeding for decades but is still not available for all crops and genotypes,and haploidization rates are generally very ***,methodological improvements to and new concepts for haploidization are ***,we report a novel system for the induction of haploid plants by mutating genes encoding egg cell-specific aspartic endopeptidases(ECSs).We show that after successful sperm–egg cell fusion,ECSs play a critical role to ensure male and female nucleus fusion after *** ecs1 ecs2 double mutant can induce haploids by both selfing and hybridization in Arabidopsis and ECS mutation is also capable of producing haploids in *** summary,our study develops a novel approach for maternal haploidization and provides new insights into the molecular basis of fertilization.

关键词： haploid induction egg cell maternal inducer semigamy fertilization

Modulation of d-orbital to realize enriched electronic cobalt sites in cobalt sulfide for enhanced hydrogen evolution in electrocatalytic water/seawater splitting

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

Rare Metals 2024年第2期43卷 511-521页

作者： Jian-Peng sun Yu Zheng Zi-Sheng Zhang xiang-Chao meng Zi-Zhen Li Key Laboratory of Marine Chemistry Theory and Technology(Ministry of Education) College of Chemistry and Chemical EngineeringOcean University of ChinaQingdao266100China Shanxi Institute of Energy Taiyuan030600China Department of Chemical and Biological Engineering Faculty of EngineeringUniversity of OttawaOttawaONK1N6 N5Canada

Herein,a novel single-atomic Pt doping and interface-rich CoS/Co(OH)_(2)(Pt-CoS/Co(OH)_(2)/C)electrocatalyst has been successfully *** from precise regulation of d-orbital electronic structure modulation on Co site,Pt-CoS/Co(OH)_(2)/C exhibited remarkable HER activity and high stability for hydrogen evolution in splitting both water(73 mV@10 mA·cm^(−2)) and seawater(87 mV@10 mA·cm^(−2)).Notably,atomic Pt doping was introduced into CoS/Co(OH)_(2),which could produce local unbalanced Coulombic force and significantly increased the number of S vacancies,and then expose abundant Co ***,Co(OH)_(2) in Pt-CoS/Co(OH)_(2)/C could act as the adsorption sites for H_(2)O in hydrogen evolution reaction *** functional theory results also proved that atomic Pt doping,S vacancies and Co(OH)_(2) coupling could result in the formation of enriched electronic Co sites and optimize d_(z2) orbital electronic structure,and then realize the depth upward shift of d-band center and enhance the adsorption of H*on Co sites.

关键词： Electrocatalysts Hydrogen evolution reaction Pt-CoS/Co(OH)_(2) d-band center Electronic structure Water/seawater electrolysis

Transfer-free chemical vapor deposition graphene for nitride epitaxy: challenges, current status and future outlook

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第3期67卷 824-840页

作者： xiang Gao Senlin Li Jingfeng Bi Kaixuan Zhou meng Li Zhongfan Liu Jingyu sun College of Energy Soochow Institute for Energy and Materials InnovationsSUDA-BGI Collaborative Innovation CenterKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006China Beijing Graphene Institute Beijing 100095China Xiamen Silan Advanced Compound Semiconductor Co.Ltd. Xiamen 361026China

Graphene, a two-dimensional material with outstanding electrical and mechanical properties, has attracted considerable attention in the field of semiconductor technologies due to its potential use as a buffer layer for the epitaxial Ⅲ-nitride growth. In recent years, significant progress has been made in the chemical vapor deposition growth of graphene on various insulating substrates for the nitride epitaxy, which offers a facile, inexpensive, and easily scalable methodology. However, certain challenges are still present in the form of producing high-quality graphene and achieving optimal interface compatibility with Ⅲ-nitride *** this review, we provide an overview of the bottlenecks associated with the transferred graphene fabrication techniques and the state-of-the-art techniques for the transfer-free graphene growth. The present contribution highlights the current progress in the transfer-free graphene growth on different insulating substrates, including sapphire, quartz, SiO_(2)/Si, and discusses the potential applications of transfer-free graphene in the Ⅲ-nitride epitaxy. Finally, it includes the prospects of the transfer-free graphene growth for the Ⅲ-nitride epitaxy and the challenges that should be overcome to realize its full potential in this field.

关键词： Transfer-free chemical vapor deposition graphene for nitride epitaxy challenges current status and future outlook graphene

Pollen tube,a one-way special train for special passengers

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2017年第17期62卷 1165-1166页

作者： Xiongpo Peng meng-xiang sun College of Life Science Wuhan UniversityWuhan 430072China

Double fertilization is a specific characteristic of angiosperms,in which two sperm cells fuse with the egg and central cell respectively[1].Different from that of animals,the two sperm cells of angiosperms have lost their ***,to fulfill the double fertilization,the two immobile sperm cells have to be sent to the female games by a specific structure,the pollen *** landing on the stigma of the pistil,the pollen grain germinates and devel-

关键词：列车单向花粉管伸长精子细胞旅客中央细胞被子植物卵细胞

Gamete Recognition in Higher Plants:An Abstruse but Charming Mystery

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2008年第7期50卷 868-874页

作者： Xiong-Bo Peng meng-xiang sun Key Laboratory of Ministry of Education for Plant Developmental Biology College of Life Sciences Wuhan University Wuhan 430072 China

Although much effort has been made to uncover the mechanism underlying double fertilization, little knowledge has been acquired for understanding the molecular base of gamete recognition, mainly because of technical limitations. Still, progress has been made in terms of the mechanism, including the identification of candidate molecules that are involved in gamete recognition in angiosperms. New cues for gamete recognition have been found by the successful separation of the gametes and construction of gamete-specific cDNA libraries in several species, and the application of molecular approaches for studying this process by mutations. Thus, the topic is considered an abstruse but charming mystery.

关键词： central cell egg cell fertilization gamete recognition sperm cell.

Embryogenesis,a process of pattern formation

在线全文

学校读者我要写书评

暂无评论

Frontiers in Biology 2011年第1期6卷 1-2页

作者： meng-xiang sun Key Laboratory of Ministry of Education for Plant Developmental Biology College of Life SciencesWuhan UniversityWuhan 430072China

Plant embryogenesis is traditionally defined as a developmental process from zygote to mature embryo,which has the potential to form a complete plant(Bhojwani,1974;Hu,2005).In dicotyledonous species,the fertilized egg or zygote usually divides according to a stereotyped pattern and gives rise to an embryo that consists of an embryonic shoot,cotyledons,hypocotyls,and an embryonic ***,the basic body plan of the plant is established during the ***,the shoot-leaf-stem structure,not including the root,is repeatedly photocopied as a basic unit throughout plant vegetative growth(Wolpert et al.,2002).In this case,embryogenesis is a seemingly endless process and the epitome of plant ***,recent studies on the molecular mechanism of embryogenesis revealed that the basic plant body plan is laid down as the establishment of the radial and apical-basal *** this process,both the radial concentric tissue layers and the apicalbasal sections of the plant body are generated,especially the root and shoot stem cell pools,which are essential for postembryonic growth(De Smet and Jürgens,2007;De Smet et al.,2010).All further development and morphogenesis are governed or guided by this basic ***,embryogenesis is,in fact,a process of pattern formation.

关键词： pattern process traditionally

The Maternal-to-Zygotic Transition in Higher Plants

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

Journal of Integrative Plant Biology 2012年第9期54卷 610-615页

作者： Hai-Ping Xin Jing Zhao meng-xiang sun Department of Cell and Developmental Biology College of LifeSciencesWuhan UniversityWuhan 430072China Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture Wuhan Botanical Gardenthe Chinese Academy of SciencesWuhan 430074China Department of Plant Protection Yunnan Agricultural UniversityKunming 650201China

During early embryogenesis in mammals and higher plants, the maternal- to-zygotic transition （MZT） marks the turnover of developmental control from maternal products to de novo zygotic genome transcripts. Intensive studies in animals indicate that early embryonic development is largely maternally controlled. In recent years, the MZT has drawn the attention of botanists, as it is important for understanding the mechanism of embryogenesis and hybrid vigor. In this study, we present a brief overview of some aspects of the MZT in flowering plants. Based on what we have learned from Nicotiana tabacum, we hypothesize that the MZT occurs before zygotic cell division and that the development of the fertilized egg cell in flowering plants can be divided into two phases： the zygote stage, which is mainly controlled maternally, and the one-celled proembryo stage, in which zygotic genome activation （ZGA） occurs and is required for zygote division.

关键词： Embryogenesis maternal-to-zygotic transition Nicotiana tabacum zygote.

Plant reproduction: Recent discoveries from China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2017年第9期59卷 591-593页

作者： Li-Jia qu meng-xiang sun College of Life Sciences Peking UniversityBeijingChina College of Life Sciences Wuhan UniversityWuhanChina

Sexual reproduction in higher plants consists of several major biological processes which include mega- and micro-gametogenesis, male-female communications, embryogenesis and endosperm development. Male-female communications include male gametophyte-sporophytic tissues （stigma/transmitting tract） interaction and male-female gametophyte communication, during which various signaling pathways are involved.

关键词： Recent discoveries from China