Results 81 to 90 of about 51,969 (188)

60Co-γ射线辐照佛手提取液提升其生物活性

open access: yesFushe yanjiu yu fushe gongyi xuebao
本研究以佛手提取液为原料,采用60Co γ射线辐照处理提升其多酚含量,并评估其在保湿、皮肤刺激性、抗氧化、美白及抗炎等方面的护肤功效。结果表明,随着吸收剂量的增加,提取液中的总多酚含量逐步升高,且其对2,2-二苯基-1-三硝基肼基自由基的清除效率与吸收剂量呈正相关。在变色硅胶和46%湿度条件下,佛手提取液表现出较高的保湿率,其保湿性能优于甘油和透明质酸钠。皮肤刺激性测试结果显示,高浓度佛手提取液处理后皮肤呈现白皙光洁状态,且无刺激性,而低浓度下无刺激反应。在0~50 kGy吸收剂量范围内 ...
先 丽   +7 more
doaj   +1 more source

The study on the technology and development of Dunaliella which are riched in β-carotene [PDF]

open access: yes, 2016
微藻在能源、医药、生物技术等有很大的应用前景,为了实现微藻的大规模工业化生产,微藻的培养、采收工艺、提取技术成为当前的研究重点。与其他藻种相比,盐藻能有效的积累天然β-胡萝卜素,其产品开发呈现多样化趋势,具有较高的经济价值,因而受到广大研究者的重视。本研究对盐藻室内生长条件及β-胡萝卜素积累条件进行考察;对室外条件下盐藻生长以及β-胡萝卜素积累情况进行监测;构建了一套规模化养殖工艺;提出了两种盐藻分离工艺;建立了植物油微波提取β-胡萝卜素的工艺。研究得到以下主要结论: (1)室内条件下(6000Lux ...
熊琼
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Issues of Bounded Geographies and Participatory Governance in Accessing Water in Informal Settlements: A Case of Khulna City, Bangladesh

open access: yesWorld Water Policy, Volume 12, Issue 2, May 2026.
ABSTRACT This paper explores the unequal water supply infrastructure in Khulna city's informal settlements, focusing on the largest slum, Rupsha. It investigates both formal and informal water governance, examining the roles of various actors, their decision‐making processes, and the challenges these settlements face in accessing water.
Md Salauddin, Awais Piracha
wiley   +1 more source

基于S-L模型的憎水性图像水珠形状提取

open access: yesGaoya dianqi, 2009
憎水性图像水珠形状提取是绝缘子憎水性等级评价的重要前提。Snake模型在提取边界轮廓时存在着对初始轮廓敏感、边界信息捕捉能力较差等问题,为此笔者在S-L模型的基础上,利用水珠图像的先验信息来改进S-L模型对水珠形状的提取过程,在一定程度上克服了Snake模型的缺点,提高了轮廓形变过程中的拓扑能力,提高了形状提取的精确度。实验结果表明,该方法有效地实现了水珠形状的提取,为后续绝缘子性能的等级评价提供依据。
唐良瑞, 于文文, 陆俊
doaj  

化感物质的抑藻作用研究、应用及生态安全性评价 [PDF]

open access: yes, 2012
水体富营养化日益严重,水华频繁爆发,如何有效控制水华,治理富营养化水体是目前水环境领域的研究热点和前沿。目前湖泊藻类控制技术主要有:物理方法、化学法、生物法,但是这些方法都有其固有的缺点。利用植物化感作用抑制有害藻类生长具有廉价、生态安全等优点近年来备受关注。化感作用就是生物体产生的生物活性物质即化感物质在生物体之间传递信息并导致生物体相互作用。归纳了国内外不同生活型水生植物化感作用研究的主要成果(包括已报道的抑藻水生植物种类、已从水生植物体内和种植水中分离鉴定得到的化感物质 ...
吴振斌, 王红强
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Nitrogen deposition does not exacerbate phosphorus limitation of rhizosphere microbes in subalpine forests

open access: yesFunctional Ecology, Volume 40, Issue 5, Page 1428-1442, May 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometric imbalance caused by nitrogen (N) deposition typically exacerbates phosphorus (P) limitation in plants. However, it remains unclear whether this effect extends to soil microbes, particularly those in the rhizosphere.
Jipeng Wang   +5 more
wiley   +1 more source

Instrumentation and Application of two Portable Pretreating Systems for a Speedy Plasmon-Enhanced Raman Spectroscopy Detection [PDF]

open access: yes, 2015
食品安全问题严重威胁着国民生命健康,已经成为人民群众时刻关注的焦点问题。检测食品安全的仪器方法有多种。其中,便携式光谱仪在食品安全现场快速分析中已经发挥巨大的作用。但往往由于现场样品比较复杂,需要处理后才能使用光谱仪进行检测和分析,因此在一定程度上限制了它的使用范围。实验室前处理方法虽然行之有效,但是过程繁琐耗时,同时也不适合现场使用。 本文在食品安全领域,针对几类常见食品添加剂检测前处理技术做了相关的研究,研制了两种食品安全快速检测前处理仪器与相应的检测方法,本文的研究成果如下 ...
倪伟全
core  

Wildfire strengthens the relationship between soil biodiversity and ecosystem multifunctionality in subtropical forests

open access: yesFunctional Ecology, Volume 40, Issue 5, Page 1415-1427, May 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Wildfires are disrupting and regenerating forces in nature that affect all ecosystem components. However, the impact of wildfires on soil multitrophic biodiversity and the resulting consequences for ecosystem multifunctionality (EMF) remain poorly understood.
Juan Zhou   +6 more
wiley   +1 more source

Beyond Political Control and Bureaucratic Protection: Public Appointments for the Formation of Programmatic Groups and Representative Bureaucracy

open access: yesReview of Policy Research, Volume 43, Issue 3, May 2026.
ABSTRACT Public appointments shape the top‐level bureaucracy by serving as a gateway for professionals with different profiles, chosen based on different criteria. In general, the literature has been more interested in analyzing appointments based on merit or sponsorship, based on verification of loyalty to the government or technical competence ...
André Vaz Lopes   +1 more
wiley   +1 more source

Universal Steganalysis of Digital Image Based on Frequency Domain Partition [PDF]

open access: yes, 2015
互联网技术在不断发展的同时,信息安全问题也显得愈为重要。信息隐藏技术作为信息安全领域的重要研究课题一直为人们所关注。隐写技术是信息隐藏的重要研究方向,它是将需要传输的秘密信息隐藏于看似无关的数字载体中,且不被第三者发现或截取,以达到秘密通信的目的。而隐写分析技术是对嵌入的秘密信息进行检测和提取,防止有害信息的传输给国家和人民带来损失,具有现实意义。本文主要研究的是以JPEG图像为载体的隐写分析技术。 目前,隐写分析技术可以分为两大类:一是特定隐写检测技术,二是盲检测技术。其中 ...
陈倩
core  

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