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1.
Luo Xiaofang Dessie Wubliker Wang Meifeng Duns Gregory J. Rong Nianhang Feng Luya Zeng Jianqing Qin Zuodong Tan Yimin 《Journal of Material Cycles and Waste Management》2021,23(2):548-556
Journal of Material Cycles and Waste Management - The traditional Chinese medicinal plant Magnolia officinalis has a wide range of applications; including more than 200 kinds of patented Chinese... 相似文献
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The amounts of total NH
4
+
detected in the external media in which Phascolosoma arcuatum had been exposed to various periods of anoxia were significantly greater than those in which the worms were exposed to normoxia for a similar period. The increased NH
4
+
production by P. arcuatum during anoxic exposure was unlikely to be due to an increased catabolism of adenine nucleotides or urea. In contrast, there were significant decreases in the concentrations of several free amino acids in the coelomic plasma and body tissues of individuals during the 48 h of anoxic exposure. The amount of NH
4
+
produced by the anoxic P. arcuatum could be accounted for by the decreases in the concentrations of aspartate or glycine. Increases in the catabolism of free amino acids (FAA), leading to the increased production of NH
4
+
, in P. arcuatum during anoxia were supported by the detection of significant changes in the kinetic properties of glutamate dehydrogenase (GDH), in the deaminating direction, from worms exposed to anoxia for 48 h. The apparent increase in the affinity of GDH from the anoxic worm to glutamate would bring about a greater deaminating activity at physiological concentrations of ths substrate. P. arcuatum used in these experiments were collected from the mangrove swamp at Mandai, Singapore between 1990 and 1993. 相似文献
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G. L. Sia C. N. Ong S. E. Chia H. Y. Ong W. H. Phoon K. T. Tan 《Environmental monitoring and assessment》1991,19(1-3):401-411
This study was conducted to evaluate the usefulness of various biological parameters for monitoring of workers exposed to methyl ethyl ketone (MEK). Fifty male workers from a large magnetic videotape factory participated in this study. Personal air samples were collected using 3M organic vapor monitors and analysed for MEK by gas chromatography with flame ionisation detector (FID). 10 mL of urine; blood (1 mL) and exhaled air were also collected at the end of an 8-hour workshift. The headspace GC method was applied for measurement of urinary and blood MEK. MEK in expired air was analysed directly by using a GC/FID.The correlation coefficients (r) between environmental MEK and all other biological parameters measured show significant positive relationships. The r for environmental MEK and urine MEK was 0.84; for blood 0.73 and for breath 0.64. The correlation coefficients between blood and urine was 0.72; blood and breath was 0.88 and urine and breath 0.60. These findings suggest that measurements of unmetabolised MEK in blood, exhaled air and urine can be used for biological monitoring of MEK exposure. Nevertheless, laboratory methodological assessment is in favour of measuring urinary MEK as it is non-invasive and does not have to be analysed immediately after collection. 相似文献
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仇伟光 《辽宁城乡环境科技》2004,24(5):3-4
阐述了清洁生产和技术改造之间的关系,并通过实例进行了说明,得出将清洁生产理念融入到老工业基地的技术改造之中是企业实现经济和环境双赢的有效途径。 相似文献
8.
烧结砖生产中氟的逸出及钙基废渣固氟特性研究 总被引:4,自引:0,他引:4
砖坯烧制过程中,氟逸出的初始温度约为600℃,大部分氟在约800℃至砖坯发生明显烧结的温度内逸出,以CaO含量高的粘土原料制砖,氟逸出量相对较少。在此基础上,提出在制砖原料中添加适量钙基废渣抑制氟的逸出,并进行了详细的实验室和工业性试验;结果表明,在适宜添加量下,存氟率由约25%增至70%以下,且不影响砖制品质量。 相似文献
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某石化企业粉体料仓爆燃事故原因分析 总被引:1,自引:0,他引:1
本文以某企业HDPE料仓的一次爆燃事故为案例,通过分析事故的成因,提供了调查料仓事故的思路及整改方案的确定方法. 相似文献