Metal Ions in Biological Systems最新文献_第3页

Heavy metal uptake by plants and cyanobacteria. 植物和蓝藻对重金属的吸收。

Metal Ions in Biological Systems Pub Date : 2005-01-01

Hendrik Küpper, Peter M H Kroneck

引用次数: 0

Arsenic: its biogeochemistry and transport in groundwater. 砷的生物地球化学及其在地下水中的迁移。

Metal Ions in Biological Systems Pub Date : 2005-01-01

Charles F Harvey, Roger D Beckie

引用次数: 0

Anthropogenic impacts on the biogeochemistry and cycling of antimony. 人类活动对锑的生物地球化学和循环的影响。

Metal Ions in Biological Systems Pub Date : 2005-01-01

William Shotyk, Michael Krachler, Bin Chen

{"title":"Anthropogenic impacts on the biogeochemistry and cycling of antimony.","authors":"William Shotyk, Michael Krachler, Bin Chen","doi":"","DOIUrl":"","url":null,"abstract":"Antimony is a potentially toxic trace element with no known biological function. Antimony is commonly enriched in coals, and fossil fuel combustion appears to be the largest single source of anthropogenic Sb to the global atmosphere. Abundant in sulfide minerals, its emission to the atmosphere from anthropogenic activities is linked to the mining and metallurgy of non-ferrous metals, especially Pb, Cu, and Zn. In particular, the geochemical and mineralogical association of Sb with Pb minerals implies that, like Pb, Sb has been emitted to the environment for thousands of years because of Pb mining, smelting, and refining. In the US alone, there are more than 400 former secondary lead smelting operations and worldwide there are 133 Pb-Zn smelters in operation today. Antimony is used in creating and improving dozens of industrial and commercial materials including various alloys, ceramics, glasses, plastics, and synthetic fabrics, making waste incineration another important source of Sb to the environment. Enrichments of Sb in atmospheric aerosols, plants, soils, sediments, as well as alpine and polar snow and ice suggest that Sb contamination is extensive, but there are very few quantitative studies of the geographic extent, intensity, and chronology of this contamination. There is an urgent need to quantify the extent of human impacts and how these have changed with time. The decreasing inventories of anthropogenic Sb with time in peat cores from Switzerland and Scotland suggest that the atmospheric Sb flux may be declining, but there have been too few studies to make any general conclusions. In fact, some studies of sediments and biomonitors in central Europe show little decline in Sb concentrations during the past decades. There is an obvious need for reliable data from well dated archives such as polar snow and ice, peat bogs, and sediments. The air concentrations, extent of enrichment, particle size distribution, and rate of deposition of Sb in urban areas is cause for concern. The natural processes which controlled the Sb flux to the atmosphere in the pre-anthropogenic past are poorly understood. The cumulative amount of anthropogenic Sb in soils has not yet been quantified. The long-term fate of Sb in soils, including weathering and mobilization, has only started to be investigated. However, the limited data available suggests that, in some locations at least, anthropogenic Sb in soils may be more mobile than anthropogenic Pb. Further study of this problem is needed, as well as the chemical speciation of Sb in soil-water-plant-sediment systems, and the implications which this has for human and ecosystem health.","PeriodicalId":54739,"journal":{"name":"Metal Ions in Biological Systems","volume":"44 ","pages":"171-203"},"PeriodicalIF":0.0,"publicationDate":"2005-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25149100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heavy metal uptake by plants and cyanobacteria. 植物和蓝藻对重金属的吸收。

Metal Ions in Biological Systems Pub Date : 2005-01-01 DOI: 10.1201/9780849346071-10

H. Küpper, P. Kroneck

引用次数: 83

Iron, phytoplankton growth, and the carbon cycle. 铁，浮游植物生长，和碳循环。

Metal Ions in Biological Systems Pub Date : 2005-01-01 DOI: 10.1201/9780824751999.ch7

Joseph H Street, Adina Paytan

{"title":"Iron, phytoplankton growth, and the carbon cycle.","authors":"Joseph H Street, Adina Paytan","doi":"10.1201/9780824751999.ch7","DOIUrl":"https://doi.org/10.1201/9780824751999.ch7","url":null,"abstract":"Iron is an essential nutrient for all living organisms. Iron is required for the synthesis of chlorophyll and of several photosynthetic electron transport proteins and for the reduction of CO2, SO4(2-), and NO3(-) during the photosynthetic production of organic compounds. Iron concentrations in vast areas of the ocean are very low (<1 nM) due to the low solubility of iron in oxic seawater. Low iron concentrations have been shown to limit primary production rates, biomass accumulation, and ecosystem structure in a variety of open-ocean environments, including the equatorial Pacific, the subarctic Pacific and the Southern Ocean and even in some coastal areas. Oceanic primary production, the transfer of carbon dioxide into organic carbon by photosynthetic plankton (phytoplankton), is one process by which atmospheric CO2 can be transferred to the deep ocean and sequestered for long periods of time. Accordingly, iron limitation of primary producers likely plays a major role in the global carbon cycle. It has been suggested that variations in oceanic primary productivity, spurred by changes in the deposition of iron in atmospheric dust, control atmospheric CO2 concentrations, and hence global climate, over glacial-interglacial timescales. A contemporary application of this \"iron hypothesis\" promotes the large-scale iron fertilization of ocean regions as a means of enhancing the ability of the ocean to store anthropogenic CO2 and mitigate 21st century climate change. Recent in situ iron enrichment experiments in the HNLC regions, however, cast doubt on the efficacy and advisability of iron fertilization schemes. The experiments have confirmed the role of iron in regulating primary productivity, but resulted in only small carbon export fluxes to the depths necessary for long-term sequestration. Above all, these experiments and other studies of iron biogeochemistry over the last two decades have begun to illustrate the great complexity of the ocean system. Attempts to engineer this system are likely to provoke a similarly complex, unpredictable response.","PeriodicalId":54739,"journal":{"name":"Metal Ions in Biological Systems","volume":"43 ","pages":"153-93"},"PeriodicalIF":0.0,"publicationDate":"2005-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1201/9780824751999.ch7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25763250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 48

The biogeochemistry and fate of mercury in the environment. 汞在环境中的生物地球化学和命运。

Metal Ions in Biological Systems Pub Date : 2005-01-01 DOI: 10.1201/9780824751999.ch9

Nelson J O'Driscoll, Andrew Rencz, David R S Lean

引用次数: 40

Antitumor active trans-platinum compounds. 抗肿瘤活性反式铂化合物。

Metal Ions in Biological Systems Pub Date : 2004-01-01

Giovanni Natile, Mauro Coluccia

引用次数: 0

Ruthenium anticancer drugs. 钌抗癌药物。

Metal Ions in Biological Systems Pub Date : 2004-01-01

Enzo Alessio, Giovanni Mestroni, Alberta Bergamo, Gianni Sava