Results 41 to 50 of about 2,057,274 (187)
, 2004 由中国科学院自然科学史所组织实施、卢嘉锡院长任主编的《中国科学技术史》大型丛书正陆续面世。这是半个世纪以来，中国学者对中国古代科学技术研究成果的集大成。新出版的周魁一《中国科学技术史·水利卷 ...
宋正海
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Metabolite Characteristics Analysis During Fermentation of Laobaigan Baijiu Based on Non-Targeted Metabonomics Technology(基于非靶向代谢组学技术解析老白干白酒发酵过程中的代谢物特征) [PDF]
Shipin kexue jishu xuebaoMetabolites during Baijiu fermentation process are closely related to its unique style characteristics. Characteristics and succession of metabolites for Laobaigan Baijiu during its fermentation process have not been comprehensively analyzed.
GENG Xiaojie(耿晓杰) +8 more
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Conservation Biology, EarlyView.Abstract Site fidelity is the tendency for animals to repeatedly return to the same locations, either within or between years. Site fidelity enables animals to utilize knowledge of previously visited locations, including assessments of seasonal variations in health and mortality risks (e.g., predation), resource availability, and social benefits such ...
Tobias A. Ross +13 more
wiley +1 more source
, 2004 在稳定运行三年的复合垂直流构建湿地中试系统中进行了水体中痕量有机物的净化研究。进水为东湖茶港附近的湖水。水流方式为下行流一上行流，进水方式采用间歇式，间隔为8h，水力负荷为800mm^3／(mm^2·d)。采用C18反相SPE柱富集革取中试系统的进出水及自来水，然后对其进行GC／MS分析，结果表明，东湖水主要为石油烃污染，酞酸酯类污染严重，自来水中亦存在痕量有机物的污染。复合垂直流构建湿地中试系统的出水比进水中痕量有机物的种类及数量均有所减少．说明这种系统有助于水体中痕号有机物的去除 ...
贺锋 +4 more
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罗氏沼虾
Haiyang yu huzhao罗氏沼虾在温度适宜的条件下可常年产卵，生产上常利用其多次产卵的特性来进行育苗生产，以提高亲虾利用率，从而提高经济效益。为更深入地了解罗氏沼虾卵巢再次发育的动态变化规律及启动再次发育的关键基因和信号通路，对罗氏沼虾卵巢再发育过程中的卵巢外部形态、内部组织学及不同发育时期的转录组学进行研究。结果表明，罗氏沼虾卵巢再发育可分为卵原细胞积累期、卵母细胞生成期、卵子成熟期、再次排卵期及恢复期共5个时期；转录组测序共获得5个发育时期卵巢99.3 Gb质控后数据，成功注释到89 614个Unigenes，识别了32 ...
孔 天赐 +9 more
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Genomics‐informed management of ex situ populations
Conservation Biology, EarlyView.Abstract The European Association of Zoos and Aquariums (EAZA) manages insurance populations for hundreds of species through its EAZA ex situ programs (EEPs). EEPs help safeguard against extinction in the wild and provide source populations for genetic rescue programs.
Cock van Oosterhout +8 more
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Research on English‐Medium‐Instruction (EMI) highlights inadequate support for students transitioning from L1‐medium‐instruction to EMI. To date, little research has focused on how L2 students’ adaptation to an EMI environment influences their L2 learning motivation (LLM).
Kevin W. H. Tai
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The Development and Validation of the Chinese Vocabulary Levels Test
International Journal of Applied Linguistics, EarlyView.ABSTRACT In response to the increasing need for effective Chinese vocabulary assessments, this study developed the Chinese Vocabulary Levels Test (CVLT), a test designed for intermediate‐level Chinese as a second or foreign language (CSL/FL) learners, based on the vocabulary lists (levels 4–6) from the Chinese Proficiency Grading Standards for ...
Shiwei Qi, Ailan Fu
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Haiyang yu huzhao三角帆蚌和褶纹冠蚌均为我国主要淡水育珠蚌，其所产珍珠占世界珍珠总产量的90%以上，建立两种蚌精子冷冻保存技术，对种质资源保护和遗传育种具有重要意义。比较优化冷冻保护剂、平衡时间、精子包装、精子稀释剂及降温程序等关键技术参数，以精子活力和存活率作为保存效果评价指标，建立了三角帆蚌与褶纹冠蚌精子最优冷冻保存技术方案。结果表明，二甲基亚砜(DMSO)在5%和8%浓度下分别对两种蚌精子具有最佳保护效果，添加0.05 mol/L海藻糖保护效果显著提升；0.5 mL麦管为两种蚌精子的最适容器，优于0.25 ...
李 长志 +3 more
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