Results 81 to 90 of about 742,946 (271)
, 2003 本发明涉及植物有效活性成份提取技术，具体地说是一种用微波从植物中提取有效活性成份的方法。步骤为：1)取植物，清洗去杂；2)切碎，宽为0.3～0.9cm的细丝；3)加水浸润，微波处理，按1∶1～40固液比，加水浸润，选择微波功率为200W～800W，时间为1min～60min；4)固液分离；步骤3)中微波处理时间为5～60min；在步骤3)后加设于30～80℃下，在容器中进行水回流提取1～5小时；步骤3)中微波处理时间为1～15min；在步骤3)后再加入乙醇溶剂，使其乙醇水溶剂中乙醇的浓度为10～90 ...
张卫, 金美芳, 周谨
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Policy &Internet, Volume 18, Issue 4, December 2026.ABSTRACT This paper examines the practices ordinary social media users employ to influence the content served to them by platform algorithms, and the relationship between these practices and levels of algorithmic literacy. Practices were documented across TikTok, Facebook, Instagram, Twitter (now X), YouTube and Reddit during 65 sessions, conducted as ...
Agata Stepnik, Joanne Gray
wiley +1 more source
, 2011 目的采用微波来提取羊栖菜多糖。方法在单因素试验的基础上,选取提取时间、微波功率和液料比作为优化因素,采用Box-Benhnken试验设计和响应面分析法对羊栖菜多糖的微波提取工艺进行了优化。结果微波提取羊栖菜多糖的最佳工艺参数为:提取时间为9.61 min,微波功率476.29 W,液料比66.66∶1。在此工艺参数下水溶性羊栖菜多糖的提取率为15.58%,与预测值接近。结论同传统的热水浸提法相比,多糖提取率有所提高,且提取时间大大缩短,该优化工艺可用于羊栖菜多糖的提取。
唐志红 +5 more
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Poverty &Public Policy, Volume 18, Issue 4, December 2026.ABSTRACT Despite efforts, food security remains an elusive goal in rural Africa. Without robust safety nets, households employ alternative coping strategies, including internal and international migration to leverage remittances. Using data from a 2024 nationally representative cross‐sectional survey of 17,942 rural households conducted by the Zimbabwe
Dephine Mazambani +2 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2011 目的观察植物油提取新工艺得到的五味子提取物的改善睡眠作用。方法采用植物油提取新工艺得到五味子提取物,昆明种雄性小鼠随机分为对照组及五味子提取物低、中、高剂量组,对照组给予橄榄油20 ml/kg/d灌胃,五味子提取物低、中、高剂量组分别给予五味子提取物150、3006、00 mg/kg/d,连续灌胃15 d,通过直接睡眠实验、延长戊巴比妥钠睡眠时间实验、戊巴比妥钠阈下剂量催眠实验和巴比妥钠睡眠潜伏期实验,观察对小鼠直接睡眠、阈剂量戊巴比妥钠睡眠时间 ...
徐仲航, 金向群
doaj
, 2007 本发明属于生物工程领域。针对目前天然脱落酸 提取率和纯度不高的问题，本发明公开了一种天然脱落酸的提 取方法，通过发酵液酸化后过滤，大孔吸附树脂吸附后洗脱， 洗脱液经浓缩后进行萃取，萃取液浓缩得到结晶粗品；结晶粗品溶解后，用硅胶吸附杂质，加入己烷或苯或石油醚或四氯化碳结晶助剂，减压浓缩，冷却结晶，洗涤、真空干燥，制得95 ％以上天然脱落酸结晶体，本方法具有提取率高 ...
周金燕, 谭红, 杨杰, 李志东
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Equine Veterinary Journal, Volume 58, Issue 6, Page 1627-1635, November 2026.Abstract Background The middle conchal sinus (MCS) (ethmoidal sinus) remains one of the least understood equine paranasal compartments. Despite recognition of its involvement in sinonasal disease, disorders of the MCS often remain underdiagnosed in the absence of computed tomographic (CT) imaging due to limited anatomical understanding and challenges ...
J.‐B. Pavard +3 more
wiley +1 more source
四川大学学报. 自然科学版, 2009 用黄芪,苦参,狼毒提取物为阳性对照对紫茎泽兰提取物进行抑菌活性比较。并利用液液萃取、色谱法对紫荆泽兰醇提物进行分离精制。结果表明,紫茎泽兰醇提物具有明显抑菌效果,且效果优于狼毒提取物和黄芪提取物;对紫茎泽兰醇提物进行分离精制及抑菌试验,结果显示其乙酸乙酯萃取物柱层析组分SF4-2抑菌活性最强,能显著抑制沙门氏菌,蜡样芽孢杆菌,金黄色葡萄球菌和枯草芽孢杆菌生长,可用于食源性抗菌制剂的开发利用。
王婧 +6 more
doaj
, 2003 研究了从天然蓝藻水华藻粉中提微囊藻毒素,以及对提取物纯化的方法。通过对比不同提取剂的提取效果,发现浓度为80％的甲醇溶液提取效率最高,但采用乙醇作为替代提取剂也有较好的效率,且方法更为安全。对于提取物的纯化,可通过调节溶剂的pH至等电点以除去对反相填料具有负作用的藻胆蛋白 ...
张维昊,张光明,张锡辉,宋立荣
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Rare Metals, Volume 45, Issue 11, November 2026.ABSTRACT Arranging functional units into a specific organization is a practical structural strategy for achieving fabulous performance, known as the functional unit and organization (FUO) paradigm. This paradigm offers a concise shortcut to establishing structure–performance relationships.
Zhongtao Lu +5 more
wiley +1 more source