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排序方式: 共有424条查询结果,搜索用时 15 毫秒
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DM Peter Lorenz Rainer Bollmann Georg Klaus Hinkel Marco Mächler Gabriele Siegert Gudrun Stamminger Jörg Wendisch Sabine Ziemer 《黑龙江环境通报》1991,11(11):819-825
The study of the fetal platelet count and size can, according to the literature, be used for the prenatal diagnosis of the Wiskott-Aldrich syndrome (WAS). So far, no affected fetuses have been identified by this method. All pregnancies in which this method had been applied to resulted, as correctly predicted, in the birth of normal children. Here we report on a familial case of WAS where the haematological parameters failed to reveal the affected second child. Hence we assume that the platelet count and size of platelets remain normal in fetuses with WAS to the gestational age of 22 weeks and cannot be used for prenatal diagnosis. 相似文献
83.
Bernd Markert Rainer Steinbeck Karl-Josef Nick Karl-Georg Bernhardt 《Environmental geochemistry and health》1990,12(3):239-244
The concentrations of Ag, Al, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, K, La, Li, Mg, Mn, Mo, Na, Ni, P, Pb, Rb, Sr, Ti, V and Zn were determined by AES/ICP inMolinia caerulea andEriophorum vaginatum grown in the Leegmoor, which is in reinstatement. In the soil substrate analytical detection limits were obtained for Ag, Co, Li, Mo and Rb and additionally for Al, Be, Cd, Cr, La, Li, Ni, Pb, Ti and V in plants. Compared with mineral soils, the concentration of elements in peat is low. The elements K and P were enriched byMolinia caerulea andEriophorum vaginatum, and in addition Mn and Zn byEriophorum vaginatum. Altogether the ability of accumulation essential elements seem to be more efficient byEriophorum vaginatumthan byMolinia caerulea, which can be an ecophysiological advantage on peats, whereMolinia caerulea is normally not distributed. 相似文献
84.
Rainer Haas 《Environmental Sciences Europe》1997,9(3):123-124
Diphenylarsenic chloride (CLARK I) and diphenylarsenic cyanide (CLARK II) react quickly and quantitatively with dimercaptanes at room temperature to yield diphenylarsine thiolthioether. The thiolthioethers could be identified using mass spectrometry. This reaction can be used for the gas-chromatographic detection of diphenylarsenic compounds. 相似文献
85.
Holocene biomass burning and global dynamics of the carbon cycle 总被引:10,自引:0,他引:10
Carcaillet C Almquist H Asnong H Bradshaw RH Carrión JS Gaillard MJ Gajewski K Haas JN Haberle SG Hadorn P Müller SD Richard PJ Richoz I Rösch M Sánchez Goñi MF von Stedingk H Stevenson AC Talon B Tardy C Tinner W Tryterud E Wick L Willis KJ 《Chemosphere》2002,49(8):845-863
Fire regimes have changed during the Holocene due to changes in climate, vegetation, and in human practices. Here, we hypothesise that changes in fire regime may have affected the global CO2 concentration in the atmosphere through the Holocene. Our data are based on quantitative reconstructions of biomass burning deduced from stratified charcoal records from Europe, and South-, Central- and North America, and Oceania to test the fire-carbon release hypothesis. In Europe the significant increase of fire activity is dated approximately 6000 cal. yr ago. In north-eastern North America burning activity was greatest before 7500 years ago, very low between 7500-3000 years, and has been increasing since 3000 years ago. In tropical America, the pattern is more complex and apparently latitudinally zonal. Maximum burning occurred in the southern Amazon basin and in Central America during the middle Holocene, and during the last 2000 years in the northern Amazon basin. In Oceania, biomass burning has decreased since a maximum 5000 years ago. Biomass burning has broadly increased in the Northern and Southern hemispheres throughout the second half of the Holocene associated with changes in climate and human practices. Global fire indices parallel the increase of atmospheric CO2 concentration recorded in Antarctic ice cores. Future issues on carbon dynamics relatively to biomass burning are discussed to improve the quantitative reconstructions. 相似文献
86.
Rainer Haas Alfred Krippendorf und Klaus Steinbach 《Umweltwissenschaften und Schadstoff-Forschung》1997,9(5):243-244
Zusammenfassung Phenylarsindichlorid (PFIFFIKUS) reagiert bei Raumtemperatur in einer Gleichgewichtsreaktion schnell mit Alkoholen unter Bildung
von Phenylarsinbisether und Phenylarsinchloridether. Die Reaktionen verlaufen nicht quantitativ. Die Derivate wurden massenspektrometrisch
identifiziert.
相似文献
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