Results 31 to 40 of about 5,044 (193)
Is parvovirus B19 infection upsurge in 2023–2024 associated with adverse pregnancy outcome?
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 3, Page 307-313, September 2025.ABSTRACT Objective A surge in parvovirus B19 infections has been reported in 2023–2024 across Europe and the USA, raising concerns about the associated perinatal risks. The aim of this study was to compare perinatal outcomes following maternal parvovirus B19 infection during the 2023–2024 period with those from a pre‐2023 cohort.
S. Prasad +22 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2017 恶性肿瘤是一种体细胞遗传病,为相关基因结构与功能发生改变的结果,本文就大肠癌与之相关的基因突变及遗传易感性进行综述。1肿瘤的发生与基因突变的关系恶性肿瘤的发生及发展与相关的基因结构及其相关的功能发生改变有关。这些基因参与调控细胞的的正常生长周期、细胞的死亡及DNA的损伤修复。基因的种系突变（germ line mutation）在遗传性恶性肿瘤中起主要作用[1]。突变是生物进化的必要条件之一,没有突变就没有进化 ...
侯睿智, 舒振波, 侯睿达, 刘艳
doaj
The impacts of coastal defense structures on rocky intertidal community in Yangtze River Delta [PDF]
, 2016 长江三角洲是长江、黄河以及在此区域的其他河流的活动形成的冲积平原。末次冰期（LastGlacialMaximum，LGM）以后的一万年以来，长江三角洲在海陆交互作用的影响下逐渐扩展。位于长江三角洲地带的近900km的江苏沿岸海岸线除约40km的基岩海岸以外，均为不适宜岩相潮间带生物大量聚集的淤泥质平原海岸。近年来随着中国沿海经济的飞速发展，对土地需求的不断增加，越来越多的沿岸防护建筑正在被修建，成为我国沿岸的“海上长城”。这些沿岸防护建筑显著改变了江苏沿岸的滩涂景观，可能对潮间带群落造成严重影响 ...
黄雄伟
core
New Phytologist, Volume 247, Issue 5, Page 2086-2097, September 2025.Summary The importance of marine angiosperms, or seagrasses, as foundation species for marine coastal ecosystems is in marked contrast to their low species number of only 70 described taxa. Seagrass species tend to have very similar overall morphologies dictated by hydrodynamic forces of the ocean environment.
Xiaomei Zhang +14 more
wiley +1 more source
Guangtongxin yanjiu, 2001 使用人工智能方法对 PON网络拓扑结构进行优化 ,以富士通 FPX- 1 0 0 0无源光网络系统为例进行了仿真实验 ,并对遗传算法、增添算法和 Hopfield网络方法进行比较 ,仿真结果表明遗传算法明显优于增添算法和 Hopfield网络方法 .遗传算法可使网络建设代价最小化 ,它非常好地解决了 ...
陈亚华 +3 more
doaj
The application of genetic algorithms in LEED(遗传算法在低能电子衍射结构分析中的应用)
Zhejiang Daxue xuebao. Lixue ban, 2000 提出了一种在低能电子衍射(LEED)结构分析中自动搜寻最佳模型的优化方法——遗传算法和张量LEED相结合的联合方法。这种新方法的特点是能在全部参数变化范围内自动搜寻，避免了陷入“局域”优化模型的困难中。本文给出了这一方法的应用实例，并且展望了这种方法在表面结构研究中的应用前景。
HEJiang-ping(何江平) +2 more
doaj +1 more source
国内虹鳟代表性养殖群体的高通量SNP芯片检测及遗传分析 [PDF]
, 2018 本研究旨在对国内虹鳟(Oncorhynchus mykiss)代表性养殖群体开展全基因组水平的遗传评估。利用57K单核苷酸多态性(single nucleotide polymorphism,SNP)芯片,检测了来自不同地域的6个虹鳟养殖群体样本共计48尾,包括黑龙江虹鳟、黑龙江金鳟、四川虹鳟、四川金鳟、北京虹鳟和北京金鳟,共获得有效SNP位点50201个,在中国虹鳟中的多态比例达到97.7%,表明该芯片虽然基于美国和挪威虹鳟群体设计,但对中国群体同样具有良好的适用性。各群体最小等位基因频率均值为0 ...
Gao Guangtu +8 more
core
Ecological Solutions and Evidence, Volume 6, Issue 3, July–September 2025.Over the past three decades, a large number of natural wild soybean populations have been declining inexplicably or even have disappeared and their distribution area has significantly decreased in China, and population losses continue unabated. Therefore, this study investigated 20 herbaceous communities of wild soybeans in various habitats in ...
Ke‐Jing Wang, Xiang‐Hua Li
wiley +1 more source
The genetic structure and introgression in hybrid zones of Bostrychus sinensis in Fujian and Zhejiang coastal areas. [PDF]
, 2017 中华乌塘鳢(Bostrychussinensis)，隶属于脊椎动物门(Vertebrata)，辐鳍鱼纲(Actinopterygii)，鲈形目(Perciformes)，塘鳢科(Eleotridae)，乌塘鳢属(Bostrychus)。本研究采用了三种分子标记：微卫星标记(SSR)、线粒体DNA(mtDNA)基因序列、核基因RyR3序列检测和分析了闽浙沿海6个地理群体共计534尾中华乌塘鳢样本的杂交带遗传结构及杂交渐渗情况。目前有多种因素可以促进杂交带形成并维持杂交带的稳定，如杂种的性质 ...
梁爽
core
Genetic Structure Analysis of Y-Chromosome STR and SNP in Population of Wujiang Area, Suzhou City [PDF]
, 2019 Objective To analyze the genetic phenotypes of Y-chromosome STR and SNP in Han male population of Wujiang area, Suzhou City and explore the genetic structure of population of Wujiang area for further examination of regional-specific Y-SNP genetic markers
WU Ze, CHEN Tian-fa, ZENG Zhi-fan, et al
core +1 more source