Gangba sheep in the Tibetan plateau: Validating their unique meat quality and grazing factor analysis

Gangba sheep are known for having typical sensory characteristics attributed to free range conditions and grazing on wild plants. The genuine Gangba mutton was selected as the experimental group, and the commercial Tibetan mutton was selected as the control group, the nutritive composition of basic chemical components, amino acids and fatty acids in mutton were investigated to correlate its unique meat quality and eating satisfaction. The results showed that fatty acids were significantly higher (P<0.05) in Gangba mutton than in commercial mutton, and the higher content of flavoring amino acids (glutamic acid and aspartame) were primarily responsible for the taste attributes umami of meat juices. Moreover, the trace elements analysis in mutton and grazing factors (forage, water source and soil) were conducted, to explain the source of essential trace elements in mutton. The concentrations of essential trace elements show that the Gangba mutton was a valuable source for highly available Cu and Zn in human nutrition, and well managed with few detected of toxicity metal. The concentrations of essential trace elements in mutton are closely related to the trace elements in environmental grazing factors. In conclusion, the congenital grazing conditions (a highly mineralized water resource, natural forages and clean soils) were shown to contribute to the unique meat characteristics of Gangba sheep.     

Risk assessment and validation of farmland abandonment based on time series change detection

Environmental Science and Pollution Research - Farmland abandonment, a widespread phenomenon during land-use transition, leads to a cycling or vanishing evolution of farmland resources. As...     

The health consequences of greenhouse gas emissions: a potential pathway

Environmental Geochemistry and Health - Excessive greenhouse gas emissions might be the major culprit for environmental degradation, which have direct and indirect adverse impacts in various ways....     

Self-flocculation of enriched mixed microalgae culture in a sequencing batch reactor

Environmental Science and Pollution Research - Microalgae-based biodiesel has gained widespread interest as an alternative energy source. Low-cost microalgae harvesting technologies are important...     

内分泌干扰物对核受体二聚化影响的研究进展

环境内分泌干扰物(endocrine disrupting chemicals,EDCs)可模仿或拮抗天然激素与核受体结合,干扰核受体的同源或异源二聚,进而通过共调节因子的招募调控转录活性,最终引起内分泌干扰效应.目前研究主要针对EDCs与核受体的结合过程,忽视了其对核受体二聚化过程的影响,而该过程的阻断可直接导致转录失活.EDCs对于不同核受体二聚化的影响不同,只有激动剂EDCs能够促进雄激素受体(androgen receptor,AR)的同源二聚化,而雌激素受体(estrogen receptor,ER)在与具有激动或拮抗活性的EDCs结合后都可诱导ER二聚体的形成,但二聚化类型不同.通过检索ToxCast和Tox21数据库发现多达227种EDCs可以诱导ER二聚化,相比于ERα-ERα同源二聚体(6.09％ ～7.38％的活性率),EDCs更易诱导ERα-ERβ异源二聚体(11.25％ ～12.22％的活性率)和ERβ-ERβ同源二聚体(10.02％ ～11.69％的活性率).EDCs也能够差异性诱导其他核受体如维生素D受体(vitamin D receptor,VDR)与维甲酸X受体(retinoid X receptor,RXR)形成的异源二聚体,不同类型的二聚体对于研究EDCs转录活性的生理学相关性具有重要意义.基于经济合作与发展组织(Organization for Economic Co-operation and Development,OECD)报告的参考化学品研究发现,相比于配受体结合活性,二聚活性与转录活性之间有着更好的相关关系.本文从EDCs介导的核受体二聚化转录机制、二聚化与转录活性间的关系以及二聚化研究方法三方面,总结EDCs对核受体二聚化的影响,以期为深入理解EDCs的分子作用机制,推进化合物的内分泌干扰风险评估提供参考.     

Laboratory investigation on high- and low-temperature performances of asphalt mastics modified by waste oil shale ash

Journal of Material Cycles and Waste Management - The objective of this study was to use two kinds of waste oil shale ash (OSA) as partial replacements of conventional mineral filler for evaluating...     

Preparation and uranium (VI) biosorption for tri-amidoxime modified marine fungus material

Environmental Science and Pollution Research - The preparation, characterization, and uranium (VI) adsorption properties of tri-amidoxime modified marine fungus material (ZZF51-GPTS-EDA-AM/ZGEA)...     

电晕-催化技术治理甲苯废气的实验研究

利用脉冲电源供能,在有、无催化剂存在的２类电晕反应器中,对甲苯的去除效果进行了实验对比,并考察了影响甲苯去除率的主要因素。结果表明,对于线－筒式对反应器,在４２ＫＶ的峰值电压下,使用Ｍｎ或Ｆｅ催化剂使甲苯的去除率分别提高了２７％和２３％,去除率均在８０％以上,能量利用率约为３０Ｗ．ｈ／ｍ＾３。     

冀中南平原区气溶胶标高变化及估算模型研究

作为反映大气气溶胶垂直分布的重要参量,气溶胶标高被广泛应用于气溶胶反演及模型订正研究中.为研究气溶胶标高时空变化规律并构建其简易计算模型,基于2009～2016年气象站点观测资料及MODIS卫星反演数据,利用Peterson模型及多元回归分析对冀中南平原区气溶胶标高进行了估算分析.研究结果表明:区域气溶胶标高夏季最高,...     

湖南池塘鱼潭生态防灾体系的建立及其服务功能分析

在分析池塘渔业灾害成因基础上,运用鱼类学、生态学、自然灾害学原理,提出在池塘一角建造一个面积占池塘总面积10%～15 %、深1.0～1.5 m的鱼潭,以扩大池塘空间和鱼类避灾活动空间,增强调水功能,从而有效防止旱灾、冻灾和一定的洪涝发生,使池塘养殖处于生态安全状态.同时方便渔业管理,利于产业发展.该方法的防灾减灾能力与实施面积呈正相关.