Results 51 to 60 of about 9,644 (161)
Shuitu Baochi Xuebao, 2016 为明确玉米全生育期自然降雨特征以及坡耕地产流产沙规律，以研究区自然降雨为基础，采用野外径流小区和室内分析相结合的方法，分别对横坡垄作、平作和顺坡垄作坡面玉米全生育期（苗期、拔节期、抽雄期和成熟期）的自然降雨、径流及侵蚀产沙量进行了测定。结果表明：研究区2015年玉米全生育期内雨量为676.71 mm，其中成熟期侵蚀性雨量达411.71 mm，占累计侵蚀性雨量的69.85%。玉米全生育期内，产流受雨量、玉米生育期显著影响，横坡垄作产沙受雨量、雨强的影响显著，而平作和顺坡垄作则受雨量、株高的影响显著 ...
杨, 尹, 郑子成, 李廷轩
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The study on the association between polycyclic aromatic hydrocarbons exposure and adverse pregnancy outcomes and their mechanisms [PDF]
, 2012 目的通过流行病学调查，掌握闽南地区妊娠妇女妊娠结局情况，并探讨多环芳烃（polycyclicaromatichydrocarbons，PAHs）暴露对妊娠结局的影响，结合PAHs代谢酶活性及基因多态性分析，DNA损伤等指标，评价PAHs暴露对胎儿健康的危害。 方法利用问卷形式收集1106例孕妇流行病学资料，以了解环境因素对妊娠妇女妊娠结局的影响。采用气相色谱串联质谱（gaschromatograph-massspectrometer，GC-MS）技术测定206例孕妇外周静脉血、新生儿脐带血中PAHs含量；
钟渊福
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Integrative Conservation, Volume 4, Issue 3, Page 393-404, September 2025.We studied the challenges in human‐wildlife coexistence in Abohar wildlife sanctuary and the surrounding landscape in Punjab, India. We found that the local people's unique intrinsic motivation for conservation and the traditional approaches to conservation are no longer sufficient.
Geethanjali Mariaselvam +5 more
wiley +1 more source
The Two Faces of Introgression in Conservation Biology 基因渗入在保育生物学中的双重面貌
Integrative Conservation, Volume 4, Issue 3, Page 339-344, September 2025.Conservation biologist need to take into account the various aspects of introgression in their attempts to protect the species integrity and evolutionary potential of threatened species. To do so, they have to overcome the bias created by the Mayrian species concept that considers species as having distinct gene pools.
Harald Schneider, Charles H. Cannon
wiley +1 more source
人细小病毒B19抗体及抗心磷脂抗体(aCL)在流产人群中的检测价值
Zhongguo shiyan zhenduanxue, 2018 目的探讨人细小病毒B19抗体及抗心磷脂抗体(aCL)在流产人群中的检测价值,为流产的预防提供理论依据。方法本研究观察对象为2015年1月-2017年1月于我院妇产科就诊的386例自然流产患者以及年龄配对的200例自愿终止妊娠的孕产妇,分别设为观察组与对照组。抽取空腹肘静脉血4ml,离心分析血清后采用酶联免疫吸附试验(ELISA)检测两组孕产妇血清aCLIgG、aCLIgM水平和B19IgG、B19IgM水平,比较两组孕产妇B19IgG、B19IgM、aCLIgG、aCLIgM阳性率以及血清平均水平 ...
高阳 +4 more
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Preliminary Studies on Regulation of JAK-STAT3 Signaling Pathway by Varicella-zoster Virus Immediate-early Protein 62 [PDF]
, 2017 水痘-带状疱疹病毒（Varicella-zosterVirus，VZV）可引起水痘（Varicella/chickenpox）和带状疱疹（Herpeszoster）两种疾病。VZV初次感染人体后会引发水痘，随后病毒沿着神经轴突逆向运输至感觉神经中枢并建立长期潜伏，潜伏的部位主要包括脊髓背根神经节。随着年老、免疫抑制或劳累等情况，潜伏的VZV被重新激活，可引发较为常见的神经皮肤性疾病带状疱疹，通常伴有较为严重的后遗神经痛，影响患者的生活质量。目前缺乏针对水痘以及带状疱疹的特效药 ...
付文锟
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Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 1, Page 41-50, July 2025.ABSTRACT Objectives Monochorionic diamniotic (MCDA) twins with selective fetal growth restriction (sFGR) and either continuous (cAREDF) or intermittent (iAREDF) absent or reversed end‐diastolic flow in the umbilical artery face significant fetal and neonatal risks.
A. T. R. Noll +19 more
wiley +1 more source
‘How Does Living in Institution Impact Young Lives?’—Insights From Young People in Ci'aiyuan
Children &Society, Volume 39, Issue 4, Page 760-769, July 2025.ABSTRACT Institutional care often carries a negative reputation due to its perceived adverse effects on children and young people. However, it remains a significant form of alternative care in China. In Xiangxi, childcare institutions, known as ci'aiyuan, have been further expanding by involving wider populations in recent years.
Shian Yin
wiley +1 more source
Shuitu Baochi Xuebao, 2003 水土流失是破坏自然环境最严重和最突出的问题,我国是水土流失非常严重的国家,几乎遍 及所有的省、自治区、直辖市,共有水土流失面积492万km2,占国土面积的51.2%.严重 的水土流失不仅对自然环境造成破坏,也严重制约国民经济的发展.水利水电工程、矿产资 源开发、公路铁路建设、城镇开发建设等西部开发工程中,都将遇到水土流失与环境问题, 本文阐述了西部地区水土流失与环境的现状,分析了工程建设对水土流失与环境的影响,提出西部开发工程中防治水土流失的措施.
党进谦, 阎宁霞, 李靖
doaj +2 more sources
Shuitu Baochi Xuebao, 2017 以北京山区人工侧柏林地坡面为研究对象，基于2个2 m×5 m径流小区，设枯落物覆盖自然坡面与裸露坡面2种处理、大小2种雨强（126，70 mm/h），通过对比分析2种处理下坡面产流产沙过程，揭示林下枯落层覆盖对北京山区坡面产流产沙的影响。结果表明：（1）与裸坡相比，枯落物覆盖自然坡面产流产沙分别减少了67.0%和90.6%，其中，减沙效益大于减水效益。（2）无论是枯落物覆盖自然坡面还是裸坡，坡面产流过程均表现为先增大后趋于稳定的变化规律，但枯落物覆盖坡面产流趋于稳定的时间较裸坡有所提前。(3 ...
何玉广, 余新晓, 樊登星
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