Results 81 to 90 of about 2,730,307 (209)
Pest‐preservation paradox among insects
Conservation Biology, EarlyView.The pest‐preservation paradox is a non‐binary perspective that insects range from those that are harmful and requiring management on the one side, to those requiring conservation intervention on the opposite end of the spectrum. Importantly, the vast majority of insects occur somewhere in the center of the two extremes, and their position along the ...
Michael J. Samways +3 more
wiley +1 more source
Protected areas on international borders show uneven conservation outcomes
Conservation Biology, EarlyView.Abstract Border protected areas (BPAs) are national protected areas that are immediately adjacent to a country's border or span two or more countries; they are characterized by distinctive opportunities and pressures. They play a critical role in protecting carbon‐rich ecosystems, conserving endangered biodiversity, reducing cross‐border environmental ...
Rachakonda Sreekar +10 more
wiley +1 more source
, 2005 一种化学键合手性固定相及其制备方法，其特征在于使用糖肽类大环抗生素-去甲万古霉素作为手性选择剂，通过化学键合的方法将其键合于载体上。本发明适合于用作高效液相分离用色谱填料。所制得的固定相具有很强的手性识别能力和很好的稳定性能，可对多种不同类型的手性药物实现分离 ...
王俊德, 刘莺, 丁国生
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Gongye shui chuli, 2011 探索了几种方法对生化后的丙烯酸及其酯废水深度处理的能力。Fenton法和微波辅助Fenton法对COD的去除率>85%,臭氧氧化法和铁炭微电解法对COD的去除率均<40%,过硫酸铵辅助臭氧氧化法对COD的去除率可达79%,光电催化氧化法对COD的去除率<8%。铁炭微电解法、Fenton法、微波辅助Fenton法、臭氧氧化法可使废水可生化性由0.35分别提高到0.56、0.43、0.44、0.40,光电催化氧化法使废水可生化性锐减为0.03。
李立峰 +5 more
doaj +2 more sources
Conservation Biology, EarlyView.Abstract Robust estimates of the magnitude of protected species bycatch are essential for effective fisheries management and marine conservation. Existing bycatch estimation methods typically struggle to accurately and precisely estimate the bycatch of rare species as a result of the statistical assumptions necessary to overcome infrequent encounters ...
Christopher Long +3 more
wiley +1 more source
Risk reduction, rangeland use, and the future of human–carnivore coexistence
Conservation Biology, EarlyView.Abstract Efforts to reduce livestock losses to large carnivores are widely regarded as essential for promoting human–carnivore coexistence. Predator‐proof enclosures, compensation programs, improved livestock guarding, and real‐time predator alert systems can reduce depredation and retaliatory killing while enhancing pastoralist livelihoods.
Craig Packer
wiley +1 more source
, 2014 一种铱催化吡啶不对称氢化合成手性哌啶衍生物的方法，其用到的催化体系是铱的手性双磷配合物。反应能在下列条件内进行，温度：25-60°C；溶剂：甲苯/二氯甲烷的混合溶剂（V/V=1:1）；压力：13-50个大气压；底物和催化剂的比例是50/l；催化剂为(1,5-环辛二烯)氯化铱二聚体和双膦配体的配合物。吡啶盐的氢化能得到相应的手性2-位取代哌啶衍生物，其对映体过量可达到93％。本发明操作简便实用，原料易得，对映选择性高，产率好，且反应具有绿色原子经济性 ...
时磊, 叶智识, 周永贵
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Conservation Biology, EarlyView.Abstract Global farmland biodiversity is declining rapidly, threatening both natural ecosystems and agricultural production. Although agri‐environmental schemes incentivize farmers to adopt environmentally friendly measures, the spatial mismatch between their local implementation and the landscape‐scale habitat requirements of farmland species has been
Annika L. Hass +5 more
wiley +1 more source
, 2014 一种以分子筛为催化剂生产甲酚的方法，原料苯酚、甲醇经预热后与稀释气混合连续通过分子筛催化剂床层，在反应温度200-500℃、进料重量空速0.5-20h-1反应条件下进行气相反应生成甲酚。以MCM-49为活性组份改性制得分子筛催化剂。以苯酚甲醇为原料，甲酚选择性可达94％，对位选择性可达50％，催化剂稳定性好。生产过程中无设备腐蚀，是一种环境友好的催化剂 ...
刘琳 +4 more
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Gongye shui chuli, 1997 染料中间体二硝基氯化苯废水对生物具有毒性，是目前最难处理的废水之一。本研究采用铁屑-煤渣法对该废水进行预处理，以改善它的可生化性能，降低废水中的COD和色度。研究结果表明，经铁屑-煤渣处理之后，出水可生化性好，对生化过程无明显的抑制作用，同时废水的COD和色度的去除率也很高。
肖羽堂, 王继徽, 张盼月
doaj +2 more sources