Results 91 to 100 of about 1,486,775 (187)

发育重塑与生物多样性

open access: yes, 2014
多细胞生物的成熟个体都是由单细胞的受精卵发育而来的。如果把成熟个体的表型看成生命存在的式样或模式(pattern),那么发育就是形成和产生这种式样或模式的过程,即塑造(patterning)或发育塑造(developmental patterning)。相应地,对原来发育过程进行修饰或改变而产生新表型的过程就是发育重塑(developmental repatterning)。已有的研究结果表明,发育重塑在多细胞生物的进化过程中非常普遍,也非常重要。根据突变的类型和后果,发育重塑既包括对相同基因在表达的时、
张睿, 山红艳, 国春策, 孔宏智
core  

Whose Digital Future? Civil Society and Alternative Imaginaries in Transnational Digital Governance

open access: yesPolicy &Internet, Volume 18, Issue 3, September 2026.
ABSTRACT This article investigates different visions of digital futures, examining how desired futures are discursively constructed within civil society in transnational digital governance. The analysis builds on discourse theory and a growing body of research on imaginaries in digital governance.
Outi Puukko
wiley   +1 more source

四川布拖乐安自然保护区两栖爬行动物多样性分析

open access: yes四川大学学报. 自然科学版, 2007
2005年8月16日至30日作者对布拖乐安自然保护区的两栖爬行动物进行了调查,并分析了该保护区的生物多样性.本次调查共发现两栖爬行动物135号,经鉴定为13种,访问到有2种,共有15种,隶属于13属9科4目.分析表明:两栖爬行动物的多样性比较丰富,其多样性指数(D)分别是3.5246、1.4132.爬行类DG-F远远高于两栖类DG-F,表明爬行类的科属间多样性较高.
孙厚成   +6 more
doaj  

负密度制约和生境过滤对古田山幼苗功能多样性年际变化的影响

open access: yes, 2017
生物多样性的维持机制一直是群落生态学研究的核心内容。目前利用负密度制约和生境过滤分别解释群落多样性空间分布格局的研究较多,但结合这两种机制来解释功能多样性格局年际变化的研究还很少。本文以古田山亚热带常绿阔叶林24 ha动态监测样地的木本植物幼苗为研究对象,利用2006年和2007年的幼苗动态监测数据,比较了幼苗功能α和β多样性随时间推移而变化的趋势。结果表明:2006–2007年间,随着时间的变化,幼苗群落内与木质密度、比叶面积、叶片氮含量、叶片磷含量4种功能性状相关的功能α多样性显著增加 ...
陈声文   +11 more
core  

High‐Entropy Alloys for Photocatalysis: From Cocatalyst Engineering to Multifunctional Active Platforms

open access: yesRare Metals, Volume 45, Issue 9, September 2026.
ABSTRACT Photocatalysis has emerged as a promising approach for solar energy conversion and environmental remediation. However, its practical implementation is still hindered by limited charge‐separation efficiency, slow surface reaction kinetics, and insufficient catalyst stability.
Mengting Zhang   +5 more
wiley   +1 more source

森林动态大样地是生物多样性科学综合研究平台

open access: yes, 2017
近年来,物种共存或群落构建机制研究取得明显进展,成为群落生态学的标志性成果。大型森林动态样地途径为此提供了独特的研究平台。中国森林生物多样性监测网络(CFor Bio)自2004年开始建立以来,在各方面的共同努力下快速发展,是全球森林生物多样性研究最活跃的组成部分。已经建立的大型森林监测样地18个(附录1),1–5 ...
马克平
core  

Nanoporous/Nanocrystalline/Amorphous Multiphase Surfaces on Amorphous Alloy Fibers for Enhanced Oxygen Evolution Reaction Performance

open access: yesRare Metals, Volume 45, Issue 9, September 2026.
ABSTRACT The development of high‐performance and cost‐effective oxygen evolution reaction (OER) electrocatalysts is critical for the large‐scale deployment of green hydrogen technologies. Among various candidates, amorphous alloys have emerged as promising OER catalysts owing to their long‐range disordered atomic structures, high energy states, and ...
Bo Li   +10 more
wiley   +1 more source

十一种重楼属植物的RAPD分析

open access: yes四川大学学报. 自然科学版, 2003
作者利用随机扩增多态性DNA(RAPD)技术,对重楼属植物11个种的遗传多样性进行了分析.12个引物共扩增出86条带,其中有82条(95 3%)表现出多态性,说明重楼属植物有很高的遗传多样性.用UPGMA法则构建分子系统树,并把11个种划分为6组.
唐荣华, 王丽, 唐小为, 李云飞
doaj  

生物多样性监测依赖于地面人工观测与先进技术手段的有机结合

open access: yes, 2016
随着生物多样性保护和研究的进展,生物多样性监测受到广泛关注。以biodiversity与monitoring和observation分别组合作为主题词在Web of Science上检索,可以看出在过去的10年中(2006–2015)有关生物多样性监测的论文增长了六成多(附录1,biodiversity与monitoring组合增加69%,biodiversity与observation组合增加62%)。从过去25年生物多样性监测方面被引频次最高的50篇论文可以看出(附录2 ...
马克平
core  

Phase‐Boundary Electronic Coupling in CoP/NiCo‐LDH for High‐Efficiency Electrocatalysis and Energy Storage

open access: yesRare Metals, Volume 45, Issue 9, September 2026.
ABSTRACT Developing electrode materials with high capacity and outstanding activity is essential for energy storage and conversion technologies. However, integrating multiple functions into a single material remains challenging. Herein, we synthesized a novel CoP@NiCo layered double hydroxide (CoP@NiCo‐LDH) nano‐electrode using hydrothermal and ...
Ruiyu Li   +9 more
wiley   +1 more source

Home - About - Disclaimer - Privacy