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排序方式: 共有396条查询结果,搜索用时 15 毫秒
231.
Matyssek R Sandermann H Wieser G Booker F Cieslik S Musselman R Ernst D 《Environmental pollution (Barking, Essex : 1987)》2008,156(3):567-582
Upcoming decades will experience increasing atmospheric CO2 and likely enhanced O3 exposure which represents a risk for the carbon sink strength of forests, so that the need for cause-effect related O3 risk assessment increases. Although assessment will gain in reliability on an O3 uptake basis, risk is co-determined by the effective dose, i.e. the plant's sensitivity per O3 uptake. Recent progress in research on the molecular and metabolic control of the effective O3 dose is reported along with advances in empirically assessing O3 uptake at the whole-tree and stand level. Knowledge on both O3 uptake and effective dose (measures of stress avoidance and tolerance, respectively) needs to be understood mechanistically and linked as a pre-requisite before practical use of process-based O3 risk assessment can be implemented. To this end, perspectives are derived for validating and promoting new O3 flux-based modelling tools. 相似文献
232.
Müller B Stöckli A Stierli R Butscher E Gächter R 《Journal of environmental monitoring : JEM》2007,9(1):82-86
Concentration of dissolved reactive phosphorus ([DRP]) in rivers changes periodically (daily, weekly, seasonally) and is dependent on the weather and discharge Q. Accordingly, accurate estimation of the annual DRP load requires intensive sampling if not even continuous monitoring, which is laborious and expensive. We present a new, elaborated low cost technique based on passive samplers (P-traps), describing their design and chemical analysis. P-traps use iron(oxy)hydroxide as a sorbent, are inexpensive, easy to handle, and can be exposed for several months. We compare average DRP concentrations obtained from spot samples and P-traps and discuss the applicability and accuracy of the suggested method to measure annual P loads of rivers characterized by highly variable DRP concentrations. 相似文献
233.
Usman Muhammad Katsoyiannis Ioannis Rodrigues Josma Henna Ernst Mathias 《Environmental science and pollution research international》2021,28(42):59063-59075
Environmental Science and Pollution Research - Arsenic is among the major drinking water contaminants affecting populations in many countries because it causes serious health problems on long-term... 相似文献
234.
Frans J. Los Cardi van den Berg Hajo I. J. Wildschut Helen Brandenburg Nicolette S. den Hollander Ernst M. Schoonderwaldt Leen Pijpers Robert Jan H. Galjaard Diane Van Opstal 《黑龙江环境通报》2001,21(13):1150-1158
First-trimester chorionic villus sampling has not reached the popularity of second-trimester amniocentesis in prenatal cytogenetic diagnosis, in contrast to initial expectations. We investigated whether a difference inthe diagnostic performances of cytogenetic investigation in amniotic fluid (AF) cells and chorionic villi in favour of AF-cells might justify this. Diagnostic performance was measured as laboratory failure rate, karyotype quality (G-band score, rate of follow-up samples, rate of wrong diagnoses), and karyotype representativity (rate of follow-up samples, rate of wrong diagnoses). From 1993–1999, 11 883 AF-samples were investigated (AF-cells). In chorionic villi, short term culture preparations solely were karyotyped from 1993–1996 (n=3499) (STC-villi), short and long-term culture preparations simultaneously provided a sufficient amount of tissue being available from 1997 onwards (n=1829) ((STC+LTC)-villi). Laboratory failure rates were the same after amniocentesis (0.40%) and chorionic villus sampling (0.50%). G-band scores (mean±SD) were equal in AF-cells (373±38.1) and LTC-villi (364±32.6) but significantly lower in STC-villi (311±34.6) (p=0.001). Follow-up sampling rates because of quality reasons were the same in AF-cells (0.14%), STC- villi (0.13%) and (STC+LTC)-villi (0.11%). Two wrong diagnoses turned up among AF-cells. Follow-up sampling rates because of representativity reasons differed significantly between AF-cells (0.10%), (STC+LTC)-villi (1.31%), and STC-villi (1.99%) (p<0.001). However, the ratios of the total numbers of follow-up samples and uncertain or abnormal cytogenetic results in STC, and (STC+LTC)-villi at cytogenetic risks ⩾3% (0.132 and 0.160, respectively) were equal to that in AF-cells at risks <3% (0.155). Two wrong diagnoses were made in STC-villi. Diagnostic performance improved in the rank order of STC-villi, (STC+LTC)-villi and AF-cells. At cytogenetic risks ⩾3%, (STC+LTC)-villi showed a diagnostic performance equal to that in AF-cells. This might justify a selective use of chorionic villus sampling. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
235.
Ernst ten Heuvelhof 《生态毒理学报》2001,23(1):59-61
公用事业已经对环境质量产生重要的影响,特别是在市区 .初看起来,放宽限制或公用事业的私有化似乎提供不了任何环境效益 .然而,如果在一个合适的管理法律体制内发生这样一个变化,结果实际上是提高了人们对可持续发展的注意 .关于这一点,给出了一个关于改善公路运输的可持续发展性机会的实例研究 . 相似文献
236.
Ernst Bayer 《Die Naturwissenschaften》1960,47(19):433-439
237.
B. Kanitscheider J. Schwartzkopff H. O. Hettche O. Kinne B. Werner H. Pick G. Traving E. Lamla P. Ramdohr H. Strunz H. Werner H. Preuß E. Pfeil K. -J. Euler M. Becke G. Wunsch F. Frimmel H. Puchelt L. Horner B. Schenck L. Jaenicke D. Gericke K. Goerttler G. Wagner O. Creutzfeldt W. F. Angermeier H. Jockusch G. Kobabe G. Habermehl J. Jacobs H. Ziegler 《Die Naturwissenschaften》1975,62(1):45-52
238.
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240.
Drei neue Nickelenzyme aus anaeroben Bakterien 总被引:2,自引:0,他引:2
Rudolf K. Thauer Astrid Brandis-Heep Gabriele Diekert Hans -Harald Gilles Ernst Günther Graf Rolf Jaenchen Peter Schönheit 《Die Naturwissenschaften》1983,70(2):60-64
Until recently nickel was not considered to be an element of biological importance. Nutritional studies have shown, however, that many eucaryotic and procaryotic organisms are dependent on the transition metal for growth. Four enzymes are presently known to contain nickel: urease from plants and from bacteria; methyl CoM reductase from methanogenic bacteria; all “uptake” hydrogenases investigated so far; and carbon monoxide dehydrogenase from anaerobic bacteria. The prosthetic group of the methyl CoM reductase has been identified as a nickel tetrapyrrole, the structure of which has been elucidated. 相似文献