全文获取类型
收费全文 | 1657篇 |
免费 | 18篇 |
国内免费 | 42篇 |
专业分类
安全科学 | 23篇 |
废物处理 | 116篇 |
环保管理 | 163篇 |
综合类 | 144篇 |
基础理论 | 298篇 |
环境理论 | 2篇 |
污染及防治 | 552篇 |
评价与监测 | 304篇 |
社会与环境 | 109篇 |
灾害及防治 | 6篇 |
出版年
2023年 | 60篇 |
2022年 | 174篇 |
2021年 | 115篇 |
2020年 | 26篇 |
2019年 | 47篇 |
2018年 | 84篇 |
2017年 | 90篇 |
2016年 | 110篇 |
2015年 | 46篇 |
2014年 | 80篇 |
2013年 | 179篇 |
2012年 | 74篇 |
2011年 | 91篇 |
2010年 | 69篇 |
2009年 | 61篇 |
2008年 | 79篇 |
2007年 | 56篇 |
2006年 | 63篇 |
2005年 | 37篇 |
2004年 | 23篇 |
2003年 | 20篇 |
2002年 | 31篇 |
2001年 | 9篇 |
2000年 | 7篇 |
1999年 | 5篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 8篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 3篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1979年 | 3篇 |
1966年 | 1篇 |
1965年 | 2篇 |
1964年 | 2篇 |
1963年 | 1篇 |
1962年 | 2篇 |
1961年 | 4篇 |
1958年 | 3篇 |
1957年 | 3篇 |
1956年 | 2篇 |
1955年 | 4篇 |
1953年 | 1篇 |
排序方式: 共有1717条查询结果,搜索用时 609 毫秒
831.
Phthalate esters in water and sediments of the Kaveri River,India: environmental levels and ecotoxicological evaluations 总被引:3,自引:0,他引:3
832.
Since the last few decades, terrestrial diversity is found to be under stress due to the contamination by various chemicals and gases of aquatic and agricultural media. The bioaccumulation of these compounds at certain concentrations in different tissues produces histopathological changes leading to behavioral changes in target animals. This study focused on terrestrial molluscan slug, Semperula maculata, against lethal concentrations of mercury chloride (HgCl2). Bioaccumulation of Hg was highest in ovotestis, while lowest in the molluscan penis. Histopathological changes were observed in the cellular arrangement of reproductive organs. Alterations in the penis and the dart gland included dilated unicellular, multicellular glands, and muscular dystrophy, dilated peripheral glandular cells, respectively; dilation being maximal in the prostate gland. Ovotestis showed depleted number of gametocytes. Vacoulized pre-vitellogenic oocytes with early vitellogenic oocytes were noted under light microscopy. Mercury produced toxicity on secretory functions and lowered the rate of reproduction in animals. Evidence indicates that Hg produced gamete degeneration, impacted reproductive capacity and survival of this species in the ecosystem. 相似文献
833.
834.
Amesho Kassian T. T. Lin Yuan-Chung Mohan S. Venkata Halder Subham Ponnusamy Vinoth Kumar Jhang Syu-Ruei 《Environmental Chemistry Letters》2023,21(1):183-230
Environmental Chemistry Letters - The global energy demand has been projected to rise over 28% by 2040, calling for more renewable resources such as lignocellulosic biomass to produce biofuels, and... 相似文献
835.
Rajendran Devi Sri Chidambaram Ashok Kumar Ponnusamy Senthil Venkataraman Swethaa Muthusamy Shanmugaprakash Vo Dai-Viet Nguyen Rangasamy Gayathri Vaithyanathan Vasanth Kumar Vaidyanathan Vinoth Kumar 《Environmental Chemistry Letters》2023,21(2):911-934
Environmental Chemistry Letters - Modern biomass and organic waste are becoming major, carbon-neutral sources of fine chemicals, biomolecules and fuels to replace fossil fuel products. As a... 相似文献
836.
Gautam Aparna Khajone Vijay B. Bhagat Pundlik R. Kumar Sushil Patle Dipesh S. 《Environmental Chemistry Letters》2023,21(6):3105-3126
Environmental Chemistry Letters - Diminishing petroleum reserves, increasing carbon emissions, and the growing demand for fuels are calling for alternative fuels. Global diesel consumption... 相似文献
837.
Shrivastava JN Satsangi GP Kumar A 《Journal of environmental biology / Academy of Environmental Biology, India》2008,29(1):125-126
Prevalence of keratinophilic fungi was observed in paddy field soil during different stages of cultivation viz., transplanting, tillering, milking and maturation. Out of total 76 soil samples, 65 soil samples were found to be positive for the keratinophilic fungi. Fourteen species belonging to a single genus Chrysosporium were isolated through out the cropping season. C. keratinophilum (17.1%) followed by C. tropicum (13.15%) were found to be the most dominating geophilic species. The highest percent distribution of keratinophilic fungi appeared during the milking stage (100%) of paddy cultivation, followed by the maturation stage (89.47%). 相似文献
838.
Banu JR Yeom IT Esakkiraj S Kumar N Logakanthi S 《Journal of environmental biology / Academy of Environmental Biology, India》2008,29(2):143-146
Sago, the tapioca starch is manufactured by over 800 small-scale units located in the Salem district, Tamil Nadu, India. During the processing of sago it generates huge quantities of biodegradable solid waste, as crushed tubers. In present study an attempt was made to convert these biodegradable solid sago tubers into value added compost using an exotic earthworm, Eudrilus eugeniae. The experiments were carried out in a plastic tray at various concentrations of sago-sludge (50% 75% and 100%) for a period of 90 days. During the vermicomposting, data were collected on life form (cocoon, non clitellates, clitellates) of earthworm and it was found to be high in 50% followed by 75% and 100% concentrations. Chemical analysis of worked substrates showed a step wise increase of nitrogen and phosphorus. The fold increase of phosphorus and nitrogen were found to be high for sago-sludge undergoing vermicomposting than the control. During the composting period the organic carbon decreased from its initial value of 58, 76 and 107 mg/kg to 21, 24 and 65 mg/kg for 50, 70 and 100%, respectively The microbial analysis showed that after 75 days of composting, their population stabilized and further increase in composting period did not increase their population size. The results indicate that 50% and 75% concentration of sludge mixed with bedding material was ideal for the vermicomposting. 相似文献
839.
Shanmugasundaram R Jeyalakshmi T Dutt MS Murthy PB 《Journal of environmental biology / Academy of Environmental Biology, India》2008,29(1):43-45
Larvicidal effect of neem (Azadirachta indica) and karanja (Pongamia glabra) oil cakes (individuals and combination) was studied against mosquito species. Both the oil cakes showed larvicidal activity against the mosquito species tested. The combination of neem and karanja oil cakes in equal proportion proved to have better effect than the individual treatments. The combination of the two oil cakes recorded an LC95 of 0.93, 0.54 and 0.77% against the mosquitoes, Culex quinquefasciatus, Aedes aegypti and Anopheles stephensi respectively The increase in efficacy of the combination treatment over individuals in all the mosquito larvae tested was found to range about 4 to 10 fold in terms of LC50 and 2 to 6 fold in terms of LC95. 相似文献
840.
People are exposed to ionizing radiation from the radionuclides that are present in different types of natural sources, of
which phosphate fertilizer is one of the most important sources. Radionuclides in phosphate fertilizer belonging to 232Th and 238U series as well as radioisotope of potassium (40K) are the major contributors of outdoor terrestrial natural radiation. The study of alpha activity in fertilizers, which
is the first ever in West Bengal, has been performed in order to determine the effect of the use of phosphate fertilizers
on human health. The data have been compared with the alpha activity of different types of chemical fertilizers. The measurement
of alpha activity in surface soil samples collected from the cultivated land was also performed. The sampling sites were randomly
selected in the cultivated land in the Midnapore district, which is the largest district in West Bengal. The phosphate fertilizer
is widely used for large agricultural production, mainly potatoes. The alpha activities have been measured using solid-state
nuclear track detectors (SSNTD), a very sensitive detector for alpha particles. The results show that alpha activity of those
fertilizer and soil samples varies from 141 Bq/kg to 2,589 Bq/kg and from 109 Bq/kg to 660 Bq/kg, respectively. These results
were used to estimate environmental radiation exposure on human health contributed by the direct application of fertilizers. 相似文献