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11.
Takeuchi Yoshiteru Andriamanohiarisoamanana Fetra J. Yasui Seiichi Iwasaki Masahiro Nishida Takehiro Ihara Ikko Umetsu Kazutaka 《Journal of Material Cycles and Waste Management》2018,20(1):314-322
Journal of Material Cycles and Waste Management - In this feasibility study, the anaerobic co-digestion of different organic wastes obtained from a dairy farming area in Hokkaido prefecture, Japan... 相似文献
12.
Inoue M Hata A Suzuki A Nohara M Shikazono N Yim WW Hantoro WS Donghuai S Kawahata H 《Environmental pollution (Barking, Essex : 1987)》2006,144(3):1045-1052
We determined Pb contents together with Pb isotopic compositions in coral skeletons (Porites spp.) collected from the western Pacific and adjacent seas to examine distribution of Pb in sea surfaces. Temporal records of Pb were also investigated using coral skeletons from Hainan and Ogasawara Island, located in China and Japan, respectively. The spatial distribution of Pb showed a clear dilution pattern of Pb from Asian continent to the open ocean. Also the similar trend was found in the Java Sea from Jakarta to the offshore. In addition to the spatial distribution, Pb contents in Ogasawara coral have gradually increased during last 108 years. It may be attributed to Pb emission mainly from industrial activities in Asian countries. Hainan coral, which provided 10 years record of Pb, showed a remarkable decline around 1997 probably due to the partial introduction of unleaded gasoline in China. 相似文献
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Toru Sakuma Naruji Sugiyama Takashi Ichiki Masanori Kobayashi Yoshiro Wada Daisuke Nohara 《黑龙江环境通报》1991,11(2):77-82
The urinary acylcarnitine profiles of two mothers whose first children were diagnosed to have glutaric aciduria type 2 (multiple acyl-CoA dehydrogenation deficiency, electron transfer flavoprotein (ETF) deficiency) were analysed in the second pregnancy. Large volumes of tigrylcarnitine and isovalerylcarnitine and a little glutarylcarnitine were detected. Each fetus was also diagnosed to be abnormal by enzyme activity and immunoassay of ETF protein. The acylcarnitines in the mothers' urine disappeared in 1 week after labour or artificial abortion. Acylcarnitines were never detected in the urine of controls. 相似文献
16.
Seiichi Ishikawa Naoko Ueda Yuji Okumura Yoshikazu Iida Kenzo Baba 《Journal of Material Cycles and Waste Management》2007,9(2):167-172
Spent coagulant in water supply plant sludge was extracted with H2SO4 and the efficiency of the reused coagulant was studied. The optimum pH values for coagulant extraction and clarification
with the reused coagulant were 3.0–4.0 and about 6, respectively. In treating raw influent obtained from a sewage treatment
plant and wastewater from a coastal landfill site, the removal of chemical oxygen demand (COD), total nitrogen, and total
phosphorous with the recovered coagulant was higher than that with commercial aluminum sulfate or polyaluminum chloride. In
addition, the sludge settling properties, the extra sludge mass formation, the supernatant quality, and the cost of reagents
were also studied. The coagulant recovered from water supply plant sludge by H2SO4 extraction could be successfully reused for the clarification of domestic and food industry wastewaters. 相似文献
17.
The procedure for modelling the growth of single-species populations [Sakanoue, S., 2007. Extended logistic model for growth of single-species populations. Ecol. Model. 205, 159–168] is improved to be applicable to the study of the dynamics of interacting populations. The improved procedure is based on three assumptions: resource availability changes with population size as a variable, resource supply to populations and population demand for resources are defined as functions of resource availability and population size, and the variables of resource availability and population size shift in the supply function attracted to the demand function. These assumptions are organized into three equations. The equations can generate the dynamics models of plant, herbivore, and detritivore populations, and their own resources. The models can be used to describe prey–predator dynamics. They naturally contain nonlinear terms for the predator’s numerical and functional responses. Depending on the terms, the fluctuations in resource availability and population size stabilize. The three equations can also generate the dynamics models of different populations consuming the same resources. The analysis of zero isoclines of the models shows that a superior population can be simply defined as one with a higher intrinsic rate of natural increase, that a stable coexistence may be realized with the intraspecific interference or the interspecific facilitation of superiors, and that the interspecific interference or the intraspecific facilitation of inferiors may make the coexistence unstable and the inferiors winners depending on their initial population size. 相似文献
18.
Genotoxicity of oxy-PAHs to Japanese medaka (Oryzias latipes) embryos assessed using the comet assay
Subham Dasgupta Austin Cao Brittany Mauer Beizhan Yan Seiichi Uno Anne McElroy 《Environmental science and pollution research international》2014,21(24):13867-13876
Polycyclic aromatic hydrocarbons (PAHs) have long been recognized as important environmental toxicants. Despite a plethora of information on the fate and effects of parent PAHs, relatively little is known about the environmental fate and toxicity of ketone- and quinone-substituted PAH oxidation products (termed oxy-PAHs), particularly in the aquatic environment. This study begins to fill that gap using embryos of the Japanese medaka (Oryzias latipes) as a model species. The genotoxic potential of two environmentally relevant oxy-PAHs, acenaphthenequinone and 7,12-benz[a]anthracenquinone, was assessed using the comet assay. We found that both oxy-PAHs could cause significant increases in DNA damage after only 48 h of exposure at the lowest concentrations tested (5 μg/L). Comparisons of the genotoxic potential between these oxy-PAHs and their corresponding parent PAHs (acenaphthene and benz[a]anthracene) and a well-known mutagenic PAH, benzo[a]pyrene, indicated similar potencies among all five of these compounds, particularly after longer (7 day) exposures. This study demonstrates the mutagenic potential of oxy-PAHs to an in vivo fish embryo model and points out the need for further study of their environmental occurrence and biologic effects. 相似文献
19.
Yasukatsu Maeda Atsuyoshi Nakayama Norioki Kawasaki Kazuko Hayashi Seiichi Aiba Noboru Yamamoto 《Journal of Polymers and the Environment》1996,4(4):225-233
Chain-extension reactions were carried out using titanium-iso-propoxide (TIP) as a catalyst for a series of polyesters or copolyesterethers with low molecular weights (M
n
=1500–10,000) synthesized by the ring-opening copolymerization of succinic anhydride (SA) with ethylene oxide (EO). The copolymers having aM
n
from 25,000 to 50,000 of different properties were obtained. Both the melting point (T
m
) and the fusion heat (H), which indicate the crystallinity of the copolymers, rose with an increase in SA content in the copolymers. Semitransparent films were prepared by compression molding of the copolymers. The biodegradation of the copolymer films was evaluated by enzymatic hydrolysis by lipases and by an aerobic gas evolution test in standard activated sludge. The hydrolyzability of these copolymers by three kinds of lipases was affected by their copolymer composition SA/EO, form, andM
n
. The copolyesterether (SA/EO=43/57,M
n
=48,900) was more easily biodegraded by standard activated sludge compared to the polyester (SA/EO=47/53,M
n
=36,300).Presented at the Pacifichem-95, December 17–22, 1995, Honolulu, Hawaii. 相似文献
20.
The biodegradabilities of two polyester, P(3HB-co-3HV) and PCL, in soil were studied to examine the factors affecting the biodegradability of biodegradable plastics in soil. The polymers were mixed with soil and the time course of the biodegradation of the polymer was measured by analyzing the residual polymer. The polymer biodegraded little in early period of the test, but did in the first-order kinetics after a certain time which was dependent on the test substance and soil used. The rate constant and the induction period of the biodegradation were determined from the residual curve. The rate constant and the induction period for P(3HB-co-3HV) increased and reached to the constant values with increasing the particle size of the test substance. Both values depended on the kind of test soil and on the sampling date for the same kind of soil. The variation in the biodegradability among the same kind of soil was primarily attributed to the variation in water content of the soil. The rate constant and the induction period of PCL were smaller and longer than P(3HB-co-3HV), respectively. 相似文献