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211.
212.
Monika Schlegel Alessandra Baumer Mariluce Riegel Ute Wiedemann Albert Schinzel 《黑龙江环境通报》2002,22(5):418-421
An Erratum has been published for this article in Prenatal Diagnosis 22(11) 2002: 1056. We report a case of maternal isodisomy 10 combined with mosaic partial trisomy 10 (p12.31-q11.1). Chromosome examinations from a CVS sample showed a karyotype 47,XY,+mar/46,XY. The additional marker chromosome which was present in 6/25 interphase nuclei was shown by fluorescence in situ hybridization (FISH) to have been derived from a pericentromeric segment of chromosome 10. DNA analysis was performed from umbilical cord blood from the fetus after termination of the pregnancy at 18 weeks. The results showed that the two structurally normal chromosomes 10 were both of maternal origin, whereas the marker chromosome derived from the father. Autopsy of the fetus revealed hypoplasia of heart, liver, kidneys and suprarenal glands, but, apart from a right bifid ureter, no structural organ abnormalities. This fetus represents the second reported instance of a maternal uniparental disomy (UPD) 10. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
213.
Coastal changes in the Ebro delta: Natural and human factors 总被引:1,自引:0,他引:1
The development of the delta of the River Ebro (Ebre) has, during recent centuries, been controlled by both natural and man-induced
factors. Deforestation by man of the Ebro drainage basin favoured a fast progradation of the deltaic system until this century,
when many dams were constructed along the river Ebro and its tributaries. As the sediment load of the river has been retained
behind the dams, the river sediment discharge has been drastically reduced and erosive processes have become dominant in the
Ebro delta coastal area, changing it from a river-wave to a sea-wave-dominated coast. This situation leads to a reshaping
of the nearshore delta area and a redistribution of the pre-existing beach sediment, and significant erosion has already occurred
in some zones. If these conditions continue in the future, severe changes will take place in the Ebro delta, in addition to
the effects of a relative sea level rise. The future development of this delta may be similar to that of abandoned deltaic
lobes, but faster. The present study shows, how coastal changes generated by anthropogenic factors can be faster and more
drastic than those induced only by natural factors. 相似文献
214.
Albert E. Salo William L. Oaks Robert D. MacPhee 《Journal of the Air & Waste Management Association (1995)》2013,63(4):390-393
Measuring emissions of organic materials from such sources as paint bake ovens, degreas-ing operations, and printing processes is a necessy part of a control program for solvents. Over the intervening years since 1966 when Los Angeles first enacted its solvent Rule 66, a considerable number of tests have been performed and the present test method has gone through a period of experience and improvement. A sample is collected from a stack or vent in a freeze-out trap cooled with dry ice followed by an evacuated 8-liter tank. Analysis is done by a system of gas chromatography and catalytic combustion to yield the total organic carbon content. Representative industrial emission analysis results, which demonstrate the practical applicability of the system, are shown. 相似文献
215.
216.
This is the second paper of two companion papers presenting the results of laboratory bench-scale experimental studies on
electrokinetic extraction of lead from two different kaolinites. The theoretical formulation and numerical simulation of the
process are presented in the first paper. Two different kaolinites were used in the study: (1) Georgia kaolinite and (2) Milwhite
kaolinite. The lead spiked in Georgia kaolinite was highly mobilized and effectively extracted by the technique as the pH
in the soil was significantly lowered by the electrokinetic process. Milwhite kaolinite has a much higher acid/base buffer
capacity, and the required acidic environment could not be developed. As a result, removal of the lead spiked in Milwhite
kaolinite was minimal. Comparison between simulations and experimental results is also presented. Factors affecting the cleanup
efficiency of the process and potential enhancement techniques are also discussed. 相似文献
217.
218.
Amy Pruden Marie A Sedran Makram T Suidan Albert D Venosa 《Water environment research》2005,77(3):297-303
The feasibility of biodegradation of the fuel oxygenate methyl tert-butyl ether (MTBE) under iron-reducing conditions was explored in batch and continuous-flow systems. A porous pot completely-mixed reactor was seeded with diverse cultures and operated under iron-reducing conditions. For batch studies, culture from the reactor was transferred anaerobically to serum bottles containing either MTBE alone or MTBE with ethanol (EtOH) and excess electron acceptor. In the continuous-flow reactor, MTBE conversion to tert-butyl alcohol (TBA) was observed after 181 days of operation, and stable removal was achieved throughout the remainder of the study. Simultaneously, both the MTBE only and the MTBE and EtOH iron-reducing batch serum bottles also began to degrade MTBE. Bottles were respiked and the degradation rate was determined to be 2.36 +/- 0.10 x 10(-4) mmol MTBE/min-kgVSS. The EtOH present with MTBE degraded faster (7.76 +/- 0.08 x 10(-3) mmol EtOH/min-kg VSS) but did not have a noticeable effect on the rate of MTBE degradation. No evidence of TBA degradation was observed by the iron-reducing cultures. Stoichiometry of iron utilization was determined from the iron balance of the continuous-flow reactor, and it was found that the bulk of the electron acceptor was required for energy and maintenance with little remaining for cell synthesis. This is consistent with a yield coefficient of less than 0.1. Molecular analysis of the iron-reducing culture by denaturing gradient gel electrophoresis indicated that uncultured strains of delta-Proteobacteria were dominant in the reactor. 相似文献
219.
220.