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排序方式: 共有102条查询结果,搜索用时 31 毫秒
61.
Masahiro Miura Atsushi Shimahata Toshio Nishikawa Masakazu Aoyama Kiyoshi Tada Junichi Horiuchi Masahiro Nakahara Chikara Sakai 《Journal of Material Cycles and Waste Management》2011,13(1):80-83
To prepare a substrate for microbial conversion of xylose into xylitol, the culm of Sasa senanensis was hydrolyzed with dilute sulfuric acid. When the reaction temperature was fixed at 121°C, an optimum yield of xylose was
obtained by treatment with 2% sulfuric acid for 1 h. An increase in the sulfuric acid concentration or a prolonged reaction
time resulted in a decrease in the xylose yield. A fermentable substrate with a relatively high xylose concentration (36.7
g l−1) was obtained by hydrolysis with 2% sulfuric acid with a liquid-to-solid ratio of 5 g g−1. During hydrolysis at elevated temperatures, certain undesired byproducts were also generated, such as degradation products
of solubilized sugars and lignin, which are potential inhibitors of microbial metabolism. These compounds were, however, successfully
removed from the hydrolysate by treatment with activated char. 相似文献
62.
63.
Osamu Abe Wenshou Wei Masao Mikami Kenji Kosugi Junrong Xu Takeshi Sato Mingzhe Liu Masujiro Shimizu Atsushi Sato 《Water, Air, & Soil Pollution: Focus》2005,5(3-6):3-13
Four automatic weather stations (AWS) were installed on the slopes and foot areas of the Tianshan and Kunlun Mountains along
a longitude of 80 degrees east: (1) Taglak 2400 m a.s.l., (2) Aksu 1000 m, (3) Kartash 2800 m, and (4) Qira 1700 m. These
two slopes face the Taklimakan Desert. Tagliak lies on the southern slope of Tianshan, and Kartash on the northern slope of
Kunlun. The meteorological characteristics of the mountainous regions were investigated using surface data obtained during
an intensive observation period (IOP) in spring 2002. It was found that visibility on the slopes decreases in the daytime,
and there is no relationship between visibility and wind speed in the mountainous areas. Two snow layers containing dust particles
were observed in the snow cover in Taglak during the IOP in spring 2003. These results suggest that a warm air parcel containing
aeolian dust climbs over the slopes of the mountainous areas, and dust particles in the mountainous areas are transported
from the foot areas. 相似文献
64.
Correlations between flash points and vapor pressures at 25 °C for pure organic compounds were investigated. It was found that classification of organic compounds according to their chemical-structural characteristics (e.g., functional groups) was necessary for the correlation study. Under this classification, linearity seems to be the most appropriate correlation to explain the relationship between the inverse of flash points (°K) and the logarithm of vapor pressures (mm Hg) at 25°C for pure organic compounds. A test study to evaluate the validity of a regression line as an estimation of an unknown flash point from a known vapor pressure was carried out with a data set containing 31 alkanes and aromatics; 55% of the flash points were predicted within ±5°Cand89% were within ±10°C. Within limits of ± 5 to 10°C the procedure is useful but should be improved. 相似文献
65.
Dechlorination of polychlorinated organic compounds by electrochemical reduction with naphthalene radical anion as mediator 总被引:1,自引:0,他引:1
Electrochemical reduction with electrochemically generated naphthalene radical anion in N,N-dimethylformamide was applied to the dechlorination of five representative POPs, namely HCB, lindane, DDT, PCP and aldrin. Rapid and complete dechlorination was possible for lindane and DDT to give nearly quantitative yields of benzene and 1,1-diphenylethane, respectively. HCB was reduced through complex reaction pathways to yield unknown products. Dechlorination of PCP and aldrin beyond dichlorinated compounds was difficult because of their very negative reduction potential. The reaction pathways for each dechlorination were proposed with the identification of intermediates. 相似文献
66.
Certain chemicals possess the potential to modulate endocrine systems, and thereby interfere with reproduction and developmental processes in the wild. We analyzed endocrine disrupters nonylphenol (NP) and bisphenol A (BPA) levels at various sites in Okinawa and Ishigaki Islands, Japan. River-water samples showed undetectable to low concentrations of NP and BPA at most of the sites investigated. However, an appreciable amount of BPA was detected in sediments at one coral reef site. In addition, significant numbers of river sediment samples showed appreciable amounts of NP and BPA. Most of the sampling sites for this study are located within a distance of 1 km from the coral reefs, which are under influence of river-waters to a variable extent. Therefore, influence of endocrine disrupters may have already begun on adjacent coral reefs. Both endocrine disrupters were positively correlated with human population densities, but not with the contents of red soil generated by farm land reformation. Therefore, it is concluded that NP and BPA pollution is a consequence of human waste discharge, both domestic and industrial, and not by agricultural activities. 相似文献
67.
Snappers (Lutjanidae) are one of the important fisheries resources in tropical and subtropical waters. However, there have
been few studies clarifying the ecology of newly settled juvenile snappers. The aims of the present study were to clarify
the seasonality and lunar periodicity of the larval settlement, and the microhabitat association of newly settled juveniles
for Lutjanus gibbus in an Okinawan coral reef. Fifteen coral patches were chosen and underwater visual surveys were conducted during a 2-year
period. The larval settlement of the species mainly occurred between May and October during the 2-year survey period. In terms
of lunar periodicity of the settlement, the newly settled juveniles were mainly found between the last quarter moon and new
moon during the main settlement season. Back calculations of settlement dates based on otolith microstructure showed that
most juveniles settled during the last quarter moon and new moon. Stepwise multiple regression analyses revealed that the
newly settled juveniles were mainly found on coral patches with a large number of holes on the top of the coral patch and
this tendency was mainly consistent during the study period. The volume of holes at the base of coral patches had also a positive
effect on the abundance of newly settled juveniles in some cases. The results of the present study suggest that larval settlement
has a strong seasonal and lunar periodicity, and newly settled juveniles select coral patches with available refuge spaces. 相似文献
68.
Yutaka Saito Anthony R. Chittenden Kotaro Mori Katsura Ito Atsushi Yamauchi 《Behavioral ecology and sociobiology》2008,63(1):33-42
The number of nests containing egg masses a female makes over her lifetime and the pattern of scattering nests vary among
species in a genus of nest-weaving spider mites (Stigmaeopsis). We hypothesized that the scattered nests of small nest builders have a previously overlooked indirect effect in that the
void nests created after predation take on a new role as hindering devices that effectively decrease predator searching efficiency.
First, we demonstrated that the experimental design used in this study is a good reflection of the nest distribution pattern
of Stigmaeopsis takahashii (an intermediate-sized nest builder) in the field. Using this species as a model, we tested how different nest-scattering
patterns affect the predator to examine how scattering may indirectly provide an anti-predation strategy by increasing a predators
searching time. Next, we observed how artificially arranged void nests disturb predatory behavior in both starved and fully
fed predator females and showed that void nests have a strong hindering effect on predators. Thus, we concluded that the nesting
behavior of this mite species not only has anti-predator effects but must also have a stabilizing effect on predator–prey
interaction systems at the population level. 相似文献
69.
Atsushi Terazono Yuichi Moriguchi Shin-ichi Sakai Hiroshi Takatsuki 《Journal of Material Cycles and Waste Management》2000,2(2):80-88
This study evaluated the environmental impacts of sprayed-on asbestos, which had been used as insulation material in buildings,
from multiple perspectives, mainly at the disposal stage. The health risks from asbestos emission and energy consumption were
estimated. Two disposal scenarios were assumed for the asbestos: melting for reduced-risk disposal and ordinary packaging/landfilling.
We estimated the asbestos emission and health risk in the case of packaging/landfilling, assuming uncontrolled management
of the landfill site. A difficulty with introducing health-risk concepts into life cycle assessment (LCA) is the pulse–flux
problem, which is discussed in the light of these estimations. In order to solve this problem, we proposed a method using
a conversion factor representing exposure-dose/emission, and showed that emission could be converted into health risk. We
also estimated the energy consumption for melting asbestos in the disposal stage, which can decrease the health risk. If we
consider the energy consumption for the life cycle of asbestos, only a little energy is required for melting, compared with
the large amount of energy saved in the use stage owing to the insulating effect of the asbestos. The trade-off relationship
between health risk and energy consumption for the disposal scenarios indicated the need for weighting methods to handle trade-offs
such as this.
Received: July 2, 1998 / Accepted: December 20, 1999 相似文献
70.
Suzuki Y Nakamura M Otsuka Y Suzuki N Ohyama K Kawakami T Sato K Kajita S Hishiyama S Fujii T Takahashi A Katayama Y 《Chemosphere》2011,83(6):868-872
We characterized the ability of the cell free extract from polychlorinated dibenzo-p-dioxins degrading bacterium Geobacillus sp. UZO 3 to reduce even highly chlorinated dibenzo-p-dioxins such as octachlorodibenzo-p-dioxins in incineration fly ash. The degradation of 2,7-dichlorodibenzo-p-dioxin (2,7-DCDD) as a model dioxin catalyzed by the cell free extract from this strain implicates that the ether bonds of 2,7-DCDD molecule undergo reductive cleavage, since 4′,5-dichloro-2-hydroxydiphenyl ether and 4-chlorophenol were detected as intermediate products of 2,7-DCDD degradation. 相似文献