Results 21 to 30 of about 534,904 (167)
Read the free Plain Language Summary for this article on the Journal blog. Abstract Ecological communities are stressed by rapid and complex anthropogenic changes, threatening the persistence of biotic interactions and ecosystem functioning. Plant–pollinator communities, for instance, undergo structural transformations as a result of land‐use change ...
Erliang Gao +8 more
wiley +1 more source
Representation of obligate groundwater‐dwelling copepod diversity in European protected areas
Abstract Groundwaters sustain diverse surface ecosystems and are populated by metazoan species, mostly invertebrates, that provide fundamental ecological functions and are often of prominent conservation value due to narrow endemism and high phylogenetic rarity.
Francesco Cerasoli +7 more
wiley +1 more source
用P291{二 (二异丁基甲基)磷酸〕、TRPO(三烷基氧膦 )协同流动载体 ,N205为表面活性剂 ,液体石蜡作膜的增强剂 ,磺化煤油作溶剂 ,(NH4)2 CO3作内相试剂的乳状液膜体系 ,迁移富集钍。研究了乳状液膜的稳定性、温度、钍的浓度、外相 pH值、乳水比、油内比等因素对富集钍的影响。实验表明 ,在适宜条件下 ,钍的迁移富集率可达99.5 %~100 .5 %。此法用于富集测定水和废水中的痕量钍 ,结果相当满意。
李玉萍, 李莉芬, 王献科
doaj
Abstract Despite the crucial role of human impacts on biodiversity loss, many assessments of this loss focus on single metrics, such as species richness, and overlook the multidimensional effects of human activities. Because of its importance to ecosystem functioning, we investigated the functional diversity of medium‐ and large‐sized mammal ...
Xueyou Li +8 more
wiley +1 more source
pH值7.0±0.5时盐析蒸馏可同时分离富集污水中的挥发酚和芳胺。选用了六种盐进行实验,并对选用的不同盐的富集效果作了考察。筛选出最佳盐析剂为NaCl,250mL水样中NaCl投加质量为150g时效果最好。含苯酚和苯胺的水样仅需接取前1/5的馏出液,分体积中的回收率高达92.4%和91.5%,富集达20倍以上。该蒸馏方法可有效富集微量挥发酚和芳胺,在低浓度污水的测定中更具有优势。
李美蓉, 袁存光
doaj
酶法富集甘油酯型n-3 PUFA的研究进展Research progress on enzymatic enrichment of glyceride-type n-3 PUFA
n-3多不饱和脂肪酸(n-3 PUFA)是人体生长和健康不可或缺的一类脂肪酸。然而,天然甘油酯中的n-3 PUFA含量较低,限制了其利用价值。随着食品、医药、母乳脂替代和保健品等行业对高含量n-3 PUFA需求的不断增长,富集n-3 PUFA甘油酯已成为研究热点。其中,酶法富集因高效、绿色环保等优势,受到研究者的青睐。旨在为绿色高效酶法富集甘油酯型n-3 PUFA的研究与应用提供理论指导,综述了酶法富集n-3 PUFA甘油酯中脂肪酶的筛选、酶法富集技术路线和反应体系优化的研究进展。酶法富集n-3 ...
吴留美1,2,张羽飞2,梁永霞1,郑明明1,2,黎冬明1 WU Liumei1,2, ZHANG Yufei2, LIANG Yongxia1, ZHENG Mingming1,2, LI Dongming1
doaj +1 more source
ABSTRACT Environmental pollution across water, air, and soil systems poses escalating threats to human health and ecosystem stability, driven by heavy metals, persistent organic pollutants, particulate matter (PM), bioaerosols, and toxic gases. Conventional remediation technologies often suffer from limited selectivity, insufficient efficiency, and the
Junjie Qi +6 more
wiley +1 more source
ABSTRACT Atomically dispersed iron–nitrogen–carbon (Fe‐N‐C) catalysts have emerged as promising alternatives for oxygen reduction reaction (ORR) owing to their highly atomic utilization. However, maintaining both Fe atomic dispersion and dense Fe‐Nx sites (typically below 2 wt%) in Fe‐N‐C catalysts is still a key challenge.
Lijuan Wang +6 more
wiley +1 more source
利用选择性萃取技术对表层沉积物(生物膜)中的锰氧化物、铁/锰氧化物及有机质进行选择性萃取分离,同时考察同步萃取下来的Cu,Zn的分离情况,并运用加和模型研究表层沉积物(生物膜)中各组分对自然水体中重金属Cu,Zn的富集能力。结果表明,生物膜对自然水体中重金属Cu,Zn的富集能力大于表层沉积物,表层沉积物(生物膜)中的金属(铁、锰)氧化物对重金属Cu,Zn的单位富集能力远远大于有机质(1~2个数量级),有机质对重金属的单位富集能力可忽略不计,金属(铁、锰)氧化物是表层沉积物(生物膜 ...
李鱼 +4 more
doaj

