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407599831木虫 (著名写手)
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[求助]
翻译几句话——土壤方面
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1. 题目：Association of macroaggregates and metals in coastal waters（不清楚这里的Association of翻译成什么合适） 2. The composition and structure of marine dissolved organic matter(DOM) are important features that can affect the rates and extent of its degradation (Kujawinski et al., 2004) and aggregation into colloids—aggregates and macrogels (Verdugo et al., 2004).（不清楚colloids—aggregates and macrogels翻译成什么合适 ） 3. Macroaggregates (macrogels) occurring episodically in the northern Adriatic, offer a rare opportunity to study interactions between marine organic macromolecules and metals and metalloids (Me). Macrogels are formed by agglomeration of dissolved heteropolysaccharides, mostly of phytoplankton origin. Filtration and centrifugation were used to discriminate between macrogel matrix and interstitial water colloids. The interstitial fraction was then used in an incubation experiment to follow the progress of microbial degradation of colloids. The colloids were ultrafiltered through membranes and each size class of colloids (N30 kDa, 10–30 kDa and 5–10 kDa) was analyzed for metal, metalloid, organic carbon (Corg) and total nitrogen (Ntot) content. Higher Me concentrations and lower Me/Corgratios in matrix, which are an indicator of Me bound to organic matter, suggest that Me in a matrix can also be bound onto Me containing particles. All the studied Me in macroaggregate colloidal fraction, except Se, proved to be bound to large macromolecules (N30 kDa), mainly glycoproteins and aminopolysaccharides. During the rapid degradation of all, except the 5–10 kDa fraction, the Me associated with theN30 kDa fraction were markedly preserved. Consequently, the Me/Corgratios increased due to the loss of Corgand relative increase of metal-binding sites. The observed differences between our Me/Corgratios and the Irving–Williams series can be explained by variable background concentrations of the studied Me in the northern Adriatic. Comparison between Me levels in macroaggregate colloids and dissolved marine colloids, considered to be macroaggregate precursors, revealed similar values. Distribution coefficients (Kd)between colloidal and truly dissolved Me were lower than Kdfor particulate matter, suggesting that organic colloids, including macroaggregates, exhibit rather weak Me binding capacity and that Me are not distributed homogenously in the various particle pools in the northern Adriatic coastal waters |
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RXMCDM: 金币+1, 多谢应助！ 2014-07-24 00:16:46
407599831: 金币+85, 翻译EPI+1, ★★★★★最佳答案, 翻译的很不错，但是有些感觉不是很确切。可能是领域不同的原因吧 2014-07-25 16:58:08
RXMCDM: 金币+1, 多谢应助！ 2014-07-24 00:16:46
407599831: 金币+85, 翻译EPI+1, ★★★★★最佳答案, 翻译的很不错，但是有些感觉不是很确切。可能是领域不同的原因吧 2014-07-25 16:58:08
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1，沿海水域中大颗粒物和金属物质的联系。 2，沿海溶解有机物（DOM）的组成和结构式很重要的，它们能影响海洋的降解速率和程度（Kujawinski et al., 2004），并且也能影响海洋聚集胶体或者大颗粒凝胶的速率和程度。 3，大团聚体（大粒凝胶）在亚得里亚海北部比较常见，它为我们研究海洋中有机大分子及金属和非金属物质的关系提供了难得的机会。大粒凝胶是由溶解的杂化糖聚集而成，浮游植物为它的大量来源。采用过滤及离心两种方法来区分大粒凝胶基质和间隙水胶体。随后在温育实验中采用间质馏分方法来跟踪胶体的微生物降解过程。胶体经过细胞膜进行超滤，每个单位的胶体(N30 kDa, 10–30 kDa and 5–10 kDa)，对其进行金属，非金属，及总氮含量分析。在矩阵中的低浓度，高浓度的非金属物质浓度与有机物的指标是相呼应的，表明矩阵的非金属物的浓度能反映实际的非金属物质的浓度。在大颗粒胶体中研究的非金属物质，除了硒之外，都和大分子(N30 kDa)相绑定，主要是糖蛋白及多糖胺基物。在所有的快速降解的组分中，除了5–10 kDa 组分，和(N30 kDa组分有关系的非金属组分都被保存。因此，金属结合位点的相对增多导致了corgand的损失，从而矩阵中非金属浓度增大。本文我们研究的非金属/corgand系统与欧文-威廉姆斯系列之间存在显著差异是因为研究的亚得里亚海的非金属物的不同背景浓度，对大颗粒胶体和溶解的海洋胶体中的非金属量进行比较，发现两者值类似。胶体及溶解的非金属物质的分配系数比悬浮颗粒的分配系数要小，表明有机胶体，包括大颗粒胶团，表现出相当弱的自我结合能力，并且在亚得里亚海沿海水域中非金属物质分布并不均匀。 |
2楼2014-07-23 16:33:07
