Results 31 to 40 of about 681,279 (194)
Zhongguo youzhi, 2023 为提高茶皂苷的提取率，扩大茶皂苷的应用范围，以脱脂油茶籽饼为原料，采用超声-微波辅助法提取茶皂苷。以油茶皂苷提取率为考察指标，在单因素试验的基础上，采用Plackett-Burman试验设计筛选出具有显著影响的试验因素，再通过响应面法对茶皂苷提取工艺进行优化。另外，将超声-微波辅助法提取茶皂苷的工艺与超声辅助法和微波辅助法提取工艺进行了对比。结果表明：超声-微波辅助法提取茶皂苷的最佳工艺条件为乙醇体积分数59%、料液比1∶ 12、提取液pH 7、超声功率475 W、超声时间4 min、超声工作2 ...
司喜艳，王香玉，皇甫新燕，王琦，赵仁勇SI Xiyan, WANG Xiangyu, HUANGFU Xinyan, WANG Qi, ZHAO Renyong
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Wildlife Letters, EarlyView.Using radiotelemetry, we found that the movement and home range of the endangered Sacalia bealei varied significantly across reproductive classes and seasons, with males exhibiting greater movement than females during wet and mating seasons. The species exhibits strong aquatic dependence, favoring deep pools interspaced among riffle‐pool sequences ...
Wing Sing Chan +3 more
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Wildlife Letters, EarlyView.By comparing widespread surveys with randomly placed cameras to a protocol pairing detection dogs with cameras, we found that the detection‐dog‐guided camera survey had approximately 33 times greater detections with fewer camera nights and reduced survey costs. We recommend using detection dogs to identify areas to focus camera trapping. ABSTRACT Multi‐
Jenna B. Myers +5 more
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Zhongguo youzhi, 2022 蛋黄卵磷脂样品经微波消解，采用电感耦合等离子体质谱法测定样品中15种金属元素含量，对检测条件进行了优化，并进行了方法学考察。结果表明，在射频功率1.55 kW、载气（高纯氩气）流速 1.03 L/min、等离子气体流速15.0 L/min、蠕动泵转速 0.1 r/s、采样深度 10 mm、重复次数 3 次条件下，通过在线加入内标钪(Sc)、锗(Ge)、铟(In)、铼(Re)元素可校正基体效应和干扰，测定汞元素时，加入金元素可降低测定误差；该方法的15 种金属元素线性关系良好，线性相关系数（R）均大于0 ...
陈秋玲，祝芷琦，李咏华，王小妹，梁北梅，温恺嘉，许一靖，曾还雄，林元亨，唐顺之 CHEN Qiuling, ZHU Zhiqi, LI Yonghua,WANG Xiaomei,LIANG Beimei, WEN Kaijia,XU Yijing,ZENG Huanxiong,LIN Yuanheng,TANG Shunzhi
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Housing policies and market returns in China: Evidence from a novel policy index
Real Estate Economics, EarlyView.Abstract This article examines the relationship between housing policy interventions and market returns in China with a novel policy index. Using natural language processing techniques, we construct a sentence‐level policy index based on government policy documents from 2008 to 2024.
Siu Kei Wong, Yumou Wang
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Zhongguo youzhi, 2023 旨在为大豆油（供注射用）的质量控制及安全评价提供参考，建立了微波消解-电感耦合等离子体质谱( ICP-MS)法测定大豆油（供注射用）中金属元素含量。将0.5 g大豆油（供注射用）加硝酸溶解后，先在100 ℃预消解1 h,再采用微波消解仪进行前处理，通过ICP-MS法在射频功率1 550 W、载气（高纯氩气）流速1.03 L/min、等离子气体流速15.0 L/min、蠕动泵转速0.1 r/s、采样深度10 mm条件下测定14种金属元素含量。应用四极杆碰撞/反应池技术消除多原子离子对待测元素的干扰，以钪 ...
陈秋玲，李咏华，王小妹，许文东，林元亨，祝芷琦，梁北梅，温恺嘉，许一靖，唐顺之CHEN Qiuling, LI Yonghua,WANG Xiaomei, XU Wendong, LIN Yuanheng, ZHU Zhiqi, LIANG Beimei, WEN Kaijia, XU Yijing, TANG Shunzhi
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When and why to give shorebirds a head start
Conservation Biology, EarlyView.Abstract Headstarting is a translocation technique involving the hatching or rearing of wild eggs or young in captivity and the release of those individuals back to the wild at or before independence. It has been trialed as a conservation intervention for shorebirds over recent decades to improve the population trend of target populations by increasing
Lynda Donaldson +4 more
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The collective application of shorebird tracking data to conservation
Conservation Biology, EarlyView.Abstract Addressing urgent conservation issues, such as the drastic declines of North American migratory birds, requires creative, evidence‐based, efficient, and collaborative approaches. The abundance of over 50% of monitored North American shorebird populations has declined by over 50% since 1980. To address these declines, we developed a partnership
Autumn‐Lynn Harrison +71 more
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四川大学学报. 自然科学版, 2013 利用超声波辅助提取见血青(Liparis nervosa(Thunb.)Lindl.)总生物碱,研究了液料比、提取时间、乙醇体积分数、提取温度这4个因素对总生物碱提取率的影响,通过正交试验确定见血青中总生物碱的最佳提取工艺.结果表明,超声波辅助提取的影响因素顺序为提取温度>提取时间>乙醇体积分数>液料比.该研究得到了最佳的提取工艺为提取温度60℃,超声时间60min,乙醇体积分数80%,液料比1∶9,为见血青总生物碱工业化生产工艺的建立提供依据.
文旭 +4 more
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Emerging applications of large language models in ecology and conservation science
Conservation Biology, EarlyView.Abstract Large language models (LLMs) mark a major development in artificial intelligence, with potentially transformative implications for ecology and conservation science. Built on advanced deep‐learning architectures, these models can support a wide range of tasks. We reviewed emerging applications of LLMs, drawing on the wider scientific literature
Christos Mammides +5 more
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