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排序方式: 共有170条查询结果,搜索用时 15 毫秒
21.
Mary C. Phelan R. Curtis Rogers Ron C. Michaelis C. Lynn Moore Will Blackburn 《黑龙江环境通报》2001,21(6):457-460
Mosaicism for trisomy 13 and triploidy was detected by amniocentesis performed at 18 weeks' gestation because of fetal anomalies. Pregnancy continued and a live-born male was delivered vaginally at 37 weeks. The infant had features common to both trisomy 13 and triploidy: intrauterine growth retardation (IUGR), small abnormal ears, cleft palate, and a small jaw. In addition, he had complete cutaneous syndactyly of fingers 3 and 4 and partial syndactyly of the toes, as seen in triploidy. Mixoploidy for trisomy 13 and triploidy was confirmed postnatally in blood, skin, and placenta. Examination of chromosome heteromorphisms and DNA markers suggested the presence of two maternal contributions in the triploid cell line. In addition, the extra chromosome 13 in the trisomic cell line was derived from the mother. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
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Monitoring of Phenol in Wastewater Bioremediation by HPLC 总被引:1,自引:0,他引:1
KC Ng G Poi CM Puah V De Castro PL Rogers 《Environmental monitoring and assessment》1997,44(1-3):433-436
Bioremediation emphasizes the detoxification and destruction of toxic substances by microorganisms. Wastewater obtained from an industrial concern was solvent extracted with methyl alcohol and dichloromethane and analysed by GC/MS. Besides phenol, a large variety of organic compounds were detected. Under controlled laboratory conditions, the wastewater was innoculated with a mixed culture of microorganisms specially selected for their abilities to degrade phenol. Samples were collected at regular intervals from the stirred tank bioreactor and analysed for phenol by reverse phase HPLC with a C18 column. Results shows that from an initial phenol concentration of 987 ppm, slightly more than 50% was destroyed within 163 hours. The dry weight of the microorganisms and the plate count (CFU/ml) shows a steady increase from 0.5238 gms to 0.5355 gms and from 1.1E+9 to 1.94E+13 respectively over the same period. This suggested that the phenol was consumed by the microorganisms as the sole carbon source. 相似文献
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Fred Rogers Pat Arnott Barbara Zielinska John Sagebiel Kerry E. Kelly David Wagner 《Journal of the Air & Waste Management Association (1995)》2013,63(5):583-593
Abstract Particulate-phase exhaust properties from two different types of ground-based jet aircraft engines—high-thrust and turboshaft—were studied with real-time instruments on a portable pallet and additional time-integrated sampling devices. The real-time instruments successfully characterized rapidly changing particulate mass, light absorption, and polycyclic aromatic hydrocarbon (PAH) content. The integrated measurements included particulate-size distributions, PAH, and carbon concentrations for an entire test run (i.e., “run-integrated” measurements). In all cases, the particle-size distributions showed single modes peaking at 20–40nm diameter. Measurements of exhaust from high-thrust F404 engines showed relatively low-light absorption compared with exhaust from a turboshaft engine. Particulate-phase PAH measurements generally varied in phase with both net particulate mass and with light-absorbing particulate concentrations. Unexplained response behavior sometimes occurred with the real-time PAH analyzer, although on average the real-time and integrated PAH methods agreed within the same order of magnitude found in earlier investigations. 相似文献
24.
Avinash M. Topè Phyllis F. Rogers 《Journal of environmental science and health. Part. B》2013,48(7):657-662
The objective of the study was to evaluate the potential risk of DNA damage due to exposure to a mixture of the most widely used pesticides, namely endosulfan, chlorpyriphos and thiram at an environmentally relevant concentration (5 μM each) and the DNA protective capacity of sulforaphane (SFN) (10–30 μg/mL). DNA damage in human lymphocytes was ascertained with Single Cell Gel Electrophoresis (SCGE), also called Comet Assay. For positive control, H2O2 at 100 mM was used. The pesticide mixture produced DNA damage at the concentration used in the lymphocytes. SFN was able to offer a statistically significant (P < 0.01), concentration-dependant protection to DNA damage between 10–20 μg/mL in both the pre-incubation and co-incubation strategies. The results indicate that exposure to low levels of these pesticide mixtures can induce DNA damage, and the presence of SFN in diet may reduce the incidence of genetic damage, especially in farm workers. However, it is not clear whether SFN is involved in quenching of the free radicals generated by the pesticide mixture or it is involved in DNA repair mechanism. 相似文献
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M. Schratzberger T. A. D. Maxwell K. Warr J. R. Ellis S. I. Rogers 《Marine Biology》2008,153(4):621-642
Spatial variation of populations and their assemblages is an important component of many aspects of ecology, including the
maintenance of species diversity. In nature, organisms are generally aggregated in patches or form gradients or other spatially
related patterns. This investigation quantified the degree of spatial structure in benthic invertebrate assemblages. It examined
the distribution of infaunal assemblages of different size, mobility and contrasting life-history strategies (i.e. meiofaunal
nematodes and macrofaunal polychaetes) in two offshore muddy habitats in the Celtic Deep and the NW Irish Sea off the west
coast of the United Kingdom. The more heterogeneous habitat in the NW Irish Sea was characterised by higher tidal stress and
bottom temperature while greater water depth, mean particle diameter and organic carbon content was typical for the comparatively
homogeneous environment in the Celtic Deep. In both habitats, the environmental conditions became increasingly dissimilar
with separation. A total of 125 nematode and 88 polychaete species were recorded with 69% of the nematode and 49% of polychaete
species present at both study sites. Occurrence frequency of species, species diversity and average similarity of assemblage
composition was higher in the Celtic Deep than in the NW Irish Sea. Results from correlation analyses revealed statistically
robust relationships of community similarity and sample distance. Given their small size and low mobility, nematodes were
more susceptible to within-habitat physical variability than larger-sized, more mobile polychaetes. This, coupled with limits
to long-distance dispersal and likely restrictions in gene flow, resulted in a significant decrease in community similarity
with distance at the spatial scales sampled (i.e. within 0.1–23 km). Polychaetes, in contrast, combined a higher dispersal
potential (>23 km) with a relatively high tolerance to within-habitat environmental variability and these were the most likely
causes for non-significant relationships between the similarity of their assemblages and sample distance. The potential mechanisms
causing the observed variation and implications of results for environmental management strategies are discussed.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
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