Results 41 to 50 of about 51,969 (188)
Conservation Biology, EarlyView.Abstract Although significant biodiversity has been safeguarded by protected areas (PAs), biodiversity trends continue downward. Within the frameworks of the EU Biodiversity Strategy for 2030 and the new EU Restoration Regulation (2024), conserving critical biodiversity areas is essential.
George Kefalas +14 more
wiley +1 more source
Research on key technology of determination for synthetic edible pigment based on Raman spectroscopy [PDF]
, 2015 随着食用合成色素被广泛应用于食品工业，违规使用合成色素导致的食品安全事件屡见不鲜，给人民的生命安全造成了巨大威胁，因此食品中合成色素的现场快速检测成为亟待解决的问题。 等离激元增强拉曼光谱技术以其快速、简便、灵敏高等特点，在食用合成色素现场筛查方面表现出明显的优势。本文从拉曼散射出发，介绍了等离激元增强效应及壳层隔绝纳米粒子的增强机制，并根据拉曼光谱的特异性提出合成色素检测原理，进而搭建基于等离激元增强拉曼光谱技术的合成色素检测系统，尤其是研制了一套高效、自动化的合成色素前处理装置 ...
梁骏
core
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
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2009 研究了紫心甘薯总黄酮的微波提取工艺及其抗氧化活性.以芦丁为标准品,通过选用L9(34)正交表设计实验,确立提取总黄酮的最佳条件并以VC为对照品,采用DPPH •（二苯代苦味酰自由基）法研究提取物的抗氧化活性.紫心甘薯总黄酮的最佳提取条件为：乙醇浓度70%,提取温度80 ℃,料液比1 ：20,提取时间35 min；测得紫心甘薯薯肉和薯皮中总黄酮含量分别为1.55%和3.30%,二者抗氧化活性以半数抑制浓度(IC50)表示分别为0.020 4 ,0.019 2mg •mL-1 ...
GAOLi-wei(高丽威) +1 more
doaj +1 more source
Inulin Molecular Detection Methods of High-Performance Gel FiltrationChromatography and Changes in Inulin Molecular Weight During Storage [PDF]
, 2016 菊芋是一种耐盐抗旱植物,可用于生产菊糖.菊糖具有良好的生物活性,其活性受到聚合度的影响.本研究对比了各项条件,总结得到了一套可以用于测定菊糖相对分子量的高效凝胶过滤色谱(HPGFC)方法:纯水为流动相,0.8 m L/min洗脱,Shodex OHpak SB-804HQ色谱柱检测,柱温控制在30℃,样品进样量为每次20μL,检测器为示差折光检测器(RID),采用Sigma公司生产的右旋糖酐标准品,绘制二次方的标准曲线,检测菊糖的相对分子质量.同时利用确定的凝胶过滤色谱(GFC)方法 ...
李琬聪 +4 more
core +1 more source
A Systematic Scoping Review of Self‐Regulated Learning With AI in Language Education
International Journal of Applied Linguistics, EarlyView.ABSTRACT The rapid development of artificial intelligence (AI) technology has brought new opportunities for second/foreign language (L2) education while also raising concerns about the use of AI tools. This systematic scoping review provides a snapshot of the current state of research situated at the intersection of self‐regulated learning (SRL) and AI
Zheng Zhang, Sihan Zhou, Barry Bai
wiley +1 more source
Æ E Æ Å – Reshaping the Role of Træna Fishermen
, 2022 This diploma project aims to strengthen the viability of Træna’s community by proposing an ocean research facility in the archipelago, enabling the next generation of local fishermen to collect oceanographic data while working at sea. The idea of the fisherman as oceanographer is inextricably linked to the architectural program on the island of ...
openaire +1 more source
Study on the inhibition to tyrosinase in Xinjiang plants [PDF]
, 2015 酪氨酸酶广泛存在于微生物，动植物及人体中，是一种多亚基的含铜的氧化还原酶。酪氨酸酶是合成黑色素的重要酶类，通过改变酪氨酸酶的活性可以控制黑色素生成量，从而对生物体内黑色素水平及相关代谢途径产生影响。 本文以新疆植物为研究对象，从新疆植物中提取了一批对蘑菇酪氨酸酶具有抑制作用的天然活性物质。多种植物都是首次研究，还没有文献报道。在理论上从酶学角度系统阐述了天然活性物质与蘑菇酪氨酸酶的作用机理及其生物活性。 本文经过粗提的植物，再经石油醚，乙酸乙酯，氯仿，正丁醇萃取，得到不同提取层的物质 ...
祁瑞
core
International Journal of Applied Linguistics, EarlyView.ABSTRACT Although the use of AI technologies (e.g., chatbots and automated writing evaluations (AWE)) has gained considerable attention in language learning fields in recent years, how AI technologies have been designed and implemented in language learning education, as well as their effectiveness, is understudied.
Shen Qiao +2 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2006 目的为寻找一种高效、简便、实用的石蜡组织中DNA提取方法,本研究比较了三种不同的DNA提取方法对DNA质量的影响。方法选取淋巴相关组织的蜡块21例。三种DNA提取方法分别是简单消化煮沸法,酚/氯仿提纯法和试剂盒法。通过提取DNA的浓度和纯度、PCR扩增保守序列β-globin等方法,比较三种DNA提取方法的优劣。结果试剂盒法提取样品OD260/OD280平均比值位于1.61.8之间;提纯法位于1.31.5之间;简单消化煮沸法位于1.21.3之间。三种方法中,试剂盒法提取的DNA最为稳定 ...
齐宗利 +4 more
doaj