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111.
In order to understand the reproductive contribution among migratory types in the Japanese eel, Anguilla japonica, otolith strontium (Sr) and calcium (Ca) concentrations by X-ray electron microprobe analysis were examined for 37 silver
eels collected in Kii Channel off Shikoku Island during the spawning migration season. The wide range of otolith Sr:Ca ratios
indicated that the habitat use of A. japonica was not obligatory but facultative among fresh, brackish and marine waters during their growth phases after recruitment to
the coastal areas as glass eels. Three migratory types, which were categorized as river eels, estuarine eels and sea eels
were found. The estuarine eels were dominant (59%), followed by sea eels (22%) and river eels (19%). The low proportion of
river eels from the spawning migration season suggested that the estuarine and sea eels inhabiting the nearby coastal areas
might make a larger reproductive contribution to the next generation in this area. 相似文献
112.
There is a great deal of concern regarding the adverse effects of polychlorinated dibenzodioxins (PCDD) and polychlorinated dibenzofurans (PCDF) present in Agent Orange and other herbicides on Vietnam's population and ecosystems. The purpose of this study was to determine the effect of dioxin exposure on adrenal steroids in saliva, and dioxin levels in breast milk, of primiparas in an Agent Orange/dioxin hot-spot and a non-exposed area in Vietnam on the basis of epidemiological research. The subjects were 35 lactating women who had recently given birth to their first or second child. A further sub-study involved eight primiparas from each area. All subjects were aged between 20 and 30 years with infants aged between 4 and 16 weeks. The mean concentration of PCDD, PCDF, and PCDD?+?PCDF toxic equivalents (TEQ) in breast milk in the hot-spot area was significantly higher than in the non-exposed area. Cortisol and cortisone levels in the saliva of primiparas in the hot-spot area were also significantly higher than those in the non-exposed area. There was a significant negative correlation between cortisol and the cortisol/cortisone ratio and PCDD?+?PCDF and PCDF TEQ levels in the hot-spot area. Furthermore, the correlation between cortisol and cortisone and the PCDD + PCDF, PCDD, and PCDF TEQ in the combination of hot spot + non-exposed area was significant according to the curve (bell style). Our results suggest that Agent Orange/dioxin exposure still exerts a major influence on the salivary hormones of the Vietnamese population. 相似文献
113.
A composting toilet using sawdust as a matrix has the potential to trap pathogens that might occasionally be contained in human
feces. Therefore, care should be taken when handling the sawdust. It should also be noted that pathogenic viruses tend to have stronger
tolerance than pathogenic bacteria. The fates of several species of coliphages, T4, , Q and MS2, in sawdust were investigated as
a viral model. The fates of coliphages were significantly different among them, and they changed in response to temperature and the
water content of the sawdust. As the results, T4 coliphage had the strongest tolerance and Q had the weakest one in sawdust. It was
estimated the days required to decrease virus to a safe level based on a risk assessment. According to the rates of Q and T4, 15 days
and 167 days were required respectively for a safe level of infection risk based on actually operated composting toilet condition. Thus,
it was significantly different depending on the species and sawdust conditions. 相似文献
114.
Taguchi Shigeru Hagiwara Moe Shibata Ayumi Fujinari Hiroaki Matsumoto Sayaka Kuwata Makoto Sazawa Kazuto Hata Noriko Kuramitz Hideki 《Environmental science and pollution research international》2021,28(11):13425-13438
Environmental Science and Pollution Research - Formaldehyde (HCHO) is a naturally occurring compound found in ambient air which can induce cancer and sick-building syndrome. It plays an important... 相似文献
115.
Ultraweak photon emission from herbivory-injured maize plants 总被引:2,自引:0,他引:2
Following perception of herbivory or infection, plants exhibit a wide range of inducible responses. In this study, we found
ultraweak photon emissions from maize leaves damaged by Helicoverpa armigera (Noctuidae). Interestingly, mechanically damaged maize leaves treated with caterpillar regurgitants emitted the same intensity
and pattern of photon emissions as those from maize leaves damaged by caterpillars. Furthermore, two-dimensional imaging of
the leaf section treated with the oral secretions clearly shows that photon emissions were observed specifically at the lip
of the wound exposed to the secretions. These results suggest that the direct interaction between maize leaf cells and chemicals
contained in caterpillar regurgitants triggers these photon emissions. 相似文献
116.
Concentration changes of PCDDs, PCDFs, and dioxin-like PCBs in human breast milk samples as shown by a follow-up survey 总被引:3,自引:0,他引:3
Breast milk is known to discharge dioxins from the human body. However, to date, no direct comparison has been made of the concentrations of dioxin analogues in breast milk obtained from identical population after successive deliveries. We present here follow-up survey results of PCDDs, PCDFs, and dioxin-like PCBs concentrations in human breast milk samples from 35 women living in Tokyo from whom samples had been obtained and analyzed to determine the corresponding concentrations in the past. The average concentrations of total PCDDs, PCDFs, dioxin-like PCBs were 8.5, 5.5, 11 TEQ pg/g fat for the first samples and 5.4, 4.0, 6.6 TEQ pg/g fat for the second samples, respectively. The degrees of reduction of total PCDDs and total dioxin-like PCBs were higher than that of total PCDFs because 1,2,3,7,8-PeCDD, 2,3,4,7,8-PeCDF and 3,3',4,4',5-PeCB (#126), which were the predominant congeners among PCDDs, PCDFs, and dioxin-like PCBs, respectively, had different degrees of reduction. Moreover we observed a significant increase of the concentrations of PCDDs, PCDFs, and dioxin-like PCBs in samples from three women in this follow-up survey, and the patterns of increased isomers differed among the three samples. It was conjectured that the increase of the concentrations was due mainly to dietary intake between deliveries. It is important for pregnant women to have a balanced diet to mitigate the exposure of infants to these chemicals. 相似文献
117.
118.
Ramadan Bimastyaji Surya Rachman Indriyani Ikhlas Nurani Kurniawan Setyo Budi Miftahadi Machmuddin Fitra Matsumoto Toru 《Journal of Material Cycles and Waste Management》2022,24(5):1633-1647
Journal of Material Cycles and Waste Management - Open burning is a waste management practice performed by many people worldwide, especially in developing countries. Lack of detailed data of open... 相似文献
119.
Gombojav Delgermaa Matsumoto Toru 《Journal of Material Cycles and Waste Management》2023,25(3):1344-1358
Journal of Material Cycles and Waste Management - Since to 1990, Urbanization has occurred due to an increase in the number of unpredicted citizens and migration from the countryside to... 相似文献