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Tsang-Ming Ko Hsiao-Ling Hwa Li-Hui Tseng Fon-Jou Hsieh Shiu-Feng Huang Tzu-Yao Lee 《黑龙江环境通报》1994,14(1):57-60
We report on a woman with four successive pregnancies affected with X-linked hydrocephalus (XLH). The first child had prenatal craniocentesis and died in utero. The second child had a postnatal shunting operation, but suffers from severe growth and mental retardation at 5 years of age. In the third pregnancy, prenatal ultrasound detected hydrocephalus at the 16th and 20th weeks of gestation and the pregnancy was terminated. In the fourth pregnancy, ultrasound scanning at the 17th and 20th weeks of gestation revealed no remarkable findings, but hydrocephalus was detected at the 24th week. Autopsy confirmed the prenatal diagnosis. DNA polymorphism analysis of the Bell site of exons 17–18 of factor VIII gene of the woman and her last two fetuses seemed to be compatible with a linkage between the XLH locus and factor VIII gene. Although XLH has a variable presentation of ventriculomegaly, ultrasound scanning is still a useful tool for prenatal diagnosis at present. Earlier and more accurate prenatal diagnosis will be feasible with molecular analysis of the XLH locus or its flanking regions. 相似文献
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Dolar D Ignjatić Zokić T Košutić K Ašperger D Mutavdžić Pavlović D 《Environmental science and pollution research international》2012,19(4):1033-1042
Background
Emerging contaminants (ECs) are commonly derived from industrial wastewater, which is often a consequence of an inadequate treatment of the latter. Improperly pretreated pharmaceutical wastewater could cause difficulties in operations of wastewater treatment plants while incomplete elimination of ECs during the processing might result in their appearance in drinking water. 相似文献127.
Jeong Huy Ko Yeon-Ho Kwak Kyung-Seun Yoo Jong-Ki Jeon Sung Hoon Park Young-Kwon Park 《Journal of Material Cycles and Waste Management》2011,13(3):173-179
Experiments were performed in order to investigate the possibility for the development of catalysts for low-temperature selective
catalytic reduction (SCR) using municipal waste char and RDF byproduct. Physical and chemical activations, using water, and
HCl and KOH, were employed to increase the catalytic activities. The characteristics of the activated catalysts were investigated
using N2 adsorption–desorption and FT-IR. The catalysts activated chemically using basic treatment showed higher NO
x
removal efficiencies than those activated physically or chemically using acidic treatment. The de-NO
x
performance of the activated catalysts was dependent on the chemical properties, such as oxygen functional groups as well
as physical properties, such as specific surface area and pore volume. In order to investigate the effect of MnO
x
, which has been reported to be efficient for the removal of NO
x
in low-temperature SCR processes, the chemically activated catalyst was impregnated with manganese. The Mn-impregnated catalyst
had the highest NO
x
conversion at all of the temperatures tested in this study. 相似文献
128.
Choi IH Choi JH Ko SH Moore PA 《Journal of environmental science and health. Part. B》2011,46(5):432-435
This study was a pen trial in which the effects of adding different rates of liquid aluminum chloride (AlCl(3)) on litter pH, total volatile fatty acids (VFAs), and ammonia (NH(3)) fluxes was evaluated. Liquid AlCl(3) treatments used in this study were sprayed on the rice hull surface at rates of 100 g, 200 g, and 300 g liquid AlCl(3)/kg rice hulls; untreated rice hulls served as controls. Litter pH, total VFAs, and NH(3) fluxes were all lowered (P< 0.05) by all of the liquid AlCl(3) treatments compared with controls during certain times of the 5 week study. However, there were no significant differences among treatments on litter pH at the end of the study (from 3 to 5 weeks) or NH(3) fluxes at beginning of the study (0 to 3 weeks). Total VFAs were reduced 16 %, 29 %, and 53 % by 100 g liquid AlCl(3)/kg rice hulls, 200 g liquid AlCl(3)/kg rice hulls, and 300 g liquid AlCl(3)/kg rice hulls, respectively. Liquid AlCl(3)additions reduced NH(3) fluxes by 35 %, 57 % and 67 %, respectively, at the low, medium and high rates. In summary, these results indicate that adding liquid aluminum chloride to rice hulls would be a useful tool in reducing the negative environmental impact of poultry litter. It should be noted that the decreased VFA production and NH(3) volatilization was chiefly associated with reduction in litter pH. 相似文献
129.
Wimmerová S Lancz K Tihányi J Sovčíková E Kočan A Drobná B Palkovičová L Jurečková D Fabišiková A Conka K Trnovec T 《Chemosphere》2011,82(5):687-691
The aim was to determine half-life of six most abundant PCB congeners in the body of early adolescents. In 304 environmentally exposed children, PCB serum concentration was determined at the age of 8 and 12 years. Half-life was determined for each child assuming exponential decrease or for the whole cohort using multiple regression. Results obtained by both approaches were in agreement. PCB reuptakes corrupting half-life estimates for each child and each congener were evaluated. If one of the serum PCB concentration values fell below the level of detection (LOD) the pair was excluded and if PCB half-life value exceeded the arbitrary value of 30 years. The following median half-lives in years 4.46, 10.59, 9.7, 4.7, 9.1 and 9.8 were obtained for PCB congeners 118, 138+163, 153, 156+171, 170 and 180, respectively. The elimination half-life values were not systematically related to PCB serum concentration at any examination age. Between half-life values, percentage of children with significant reuptakes and PCB congener abundance in serum were found significant associations. 相似文献
130.
Białk-Bielińska A Maszkowska J Mrozik W Bielawska A Kołodziejska M Palavinskas R Stepnowski P Kumirska J 《Chemosphere》2012,86(10):1059-1065
Sulfonamides (SAs) are one of the oldest groups of veterinary chemotherapeutic agents. As these compounds are not completely metabolized in animals, a high proportion of the native form is excreted in feces and urine. They are therefore released either directly to the environment in aquacultures and by grazing animals, or indirectly during the application of manure or slurry. Once released into the environment, SAs become distributed among various environmental compartments and may be transported to surface or ground waters. The physicochemical properties of SAs, dosage and nature of the matrix are the factors mainly responsible for their distribution in the natural environment. Although these rather polar compounds have been in use for over half a century, knowledge of their fate and behavior in soil ecosystems is still limited. Therefore, in this work we have determined the sorption potential of sulfadimethoxine and sulfaguanidine on various natural soils. The influence on sorption of external factors, such as ionic strength and pH, were also determined. The sorption coefficients (Kd) obtained for the sulfonamides investigated were quite low (from 0.20 to 381.17 mL g−1 for sulfadimethoxine and from 0.39 to 35.09 mL g−1 for sulfaguanidine), which indicated that these substances are highly mobile and have the potential to run off into surface waters and/or infiltrate ground water. Moreover, the sorption of these pharmaceuticals was found to be influenced by OC, soil solution pH and ionic strength, with higher Kd values for soils of higher OC and lower Kd values with increasing pH and ionic strength. 相似文献