全文获取类型
收费全文 | 413篇 |
免费 | 1篇 |
专业分类
安全科学 | 56篇 |
废物处理 | 16篇 |
环保管理 | 12篇 |
综合类 | 45篇 |
基础理论 | 45篇 |
污染及防治 | 166篇 |
评价与监测 | 45篇 |
社会与环境 | 28篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 5篇 |
2022年 | 4篇 |
2021年 | 8篇 |
2020年 | 7篇 |
2019年 | 18篇 |
2018年 | 21篇 |
2017年 | 24篇 |
2016年 | 25篇 |
2015年 | 8篇 |
2014年 | 21篇 |
2013年 | 61篇 |
2012年 | 26篇 |
2011年 | 20篇 |
2010年 | 8篇 |
2009年 | 6篇 |
2008年 | 14篇 |
2007年 | 18篇 |
2006年 | 11篇 |
2005年 | 11篇 |
2004年 | 19篇 |
2003年 | 15篇 |
2002年 | 11篇 |
2001年 | 5篇 |
2000年 | 8篇 |
1999年 | 2篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1979年 | 2篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1965年 | 3篇 |
1964年 | 1篇 |
1963年 | 3篇 |
1962年 | 3篇 |
1961年 | 1篇 |
1960年 | 3篇 |
1959年 | 1篇 |
1958年 | 1篇 |
1931年 | 1篇 |
排序方式: 共有414条查询结果,搜索用时 15 毫秒
321.
322.
The redox state and activity of superoxide dismutase classes in Arabidopsis thaliana under cadmium or copper stress 总被引:1,自引:0,他引:1
The redox state of glutathione and ascorbate as well as the activity of superoxide dismutase classes were determined in leaves of Arabidopsis thaliana grown for seven days in the nutrient solution containing 0, 5 and 50 microM Cd or Cu excess. A decrease in GSH/GSSG ratio was found in plants under Cd and Cu stress. In the plants exposed to Cu stress the activity of all SOD classes increased. However, in the plants treated with Cd the activity of FeSOD and MnSOD was elevated, but CuZnSOD activity was diminished in comparison with control. In these plants the activity of SOD classes was dependent on both the GSH/GSSG and AA/DHA ratios, while in those exposed to Cu excess - on the GSH/GSSG ratio. Differences were shown in the changes both in redox state and activity of SOD classes caused by the metals differing in physiochemical properties. Moreover, relationships between changes in SOD class activities and ROS levels were discussed. 相似文献
323.
Studies on the catalytic destruction of 1,2-dichlorobenzene were carried out on a specially constructed semi-technical equipment whose most important element was a catalytic reactor with a monolithic catalyst in the form of 150 x 150 x 100 mm cubes. A catalyst made from cordierite with an active layer composed of Al2O3 - 64 wt%, TiO2 - 26 wt%, V2O5 - 6.6 wt% and WO3 - 3.4 wt% was used. The reactor made it possible to carry out the process in the temperature range 150-350 degrees C, at variable catalyst loading and different velocities of gas flow through the reactor. The content of 1,2-dichlorobenzene in the air was analysed by a chromatographic method. A significant effect of catalyst loading and temperature on 1,2-dichlorobenzene destruction efficiency was observed and no effect of the linear flow velocity through the catalyst on o-dichlorobenzene destruction efficiency was reported. The applied vanadium-tungsten catalyst on a monolithic carrier made from TiO2/gamma-Al2O3 revealed very good activity that resulted in an over 80% efficiency of 1,2-dichlorobenzene destruction at the temperature around 250 degrees C at a very high catalyst loading reaching ca. 8200 h(-1). Additionally, in this study the kinetics of 1,2-dichlorobenzene decomposition was determined, specifying the order of reaction and dependence of the decomposition rate constant on temperature, using a simple power-rate law model. 相似文献
324.
325.
Elżbieta Jekatierynczuk-Rudczyk Piotr Zieliński Magdalena Grabowska Jolanta Ejsmont-Karabin Maciej Karpowicz Adam Więcko 《Environmental monitoring and assessment》2014,186(8):5101-5121
This study describes changes in the trophic status of 12 lakes within Suwa?ki Landscape Park (SLP). All of the trophic classifications of the lakes were based on the trophic continuum division. Trophic status was determined by means of multiparameter indices using several diverse criteria. In this study, the assessment of the trophic status of lakes included water quality; abundance and biomass of bacterioplankton, phytoplankton, and zooplankton; and primary production of phytoplankton. The Carlson trophic state index (TSI) describes the level of water fertility and indicated the dominance of moderately eutrophic waters. Lakes Perty, Jeglówek, and Hańcza have a trophic status that indicates mesotrophy (TSI <50). The trophic status of the studied lakes was determined based on the bacterial abundance and clearly showed a lack of oligotrophic lakes in SLP. Based on the number of bacteria, only Lake Szurpi?y can be classified as β-mesotrophic, whereas Lake Linówek can be characterized as hypertrophic with some features typical for humic waters. The greatest value of gross primary production was observed in Lake Linówek (126.4 mg C/m3/h). The phytoplankton trophy index varied from 1.59 to 2.28, and its highest value, which indicated eutrophy, was determined for Lake Udziejek. In the case of Lakes Hańcza, Szurpi?y, Perty, Jeglówek, and Kojle, the index ranged from 1.25 to 1.74, which indicated mesotrophy. The majority of the lakes were classified as mesoeutrophic (1.75–2.24). The highest trophic status was assessed for lakes with a marked dominance of cyanobacteria (Lake Przechodnie, Lake Krajwelek, Lake Udziejek, and Lake Pogorza?ek), which is commonly recognized as an indicator of high trophic status. Considering all of the indices of trophic status, the analysis of rotifer community structure indicates that the studied group of lakes is mesoeutrophic or eutrophic. The values of crustacean zooplankton indices indicated that the trophic status of the studied lakes was close to that determined using a TSI. The parameters of zooplankton abundance and species structure allowed for the observance of changes in the tropic levels of lakes, which are difficult to detect by a chemical assay alone. 相似文献
326.
Zawadzki J Magiera T Fabijańczyk P Kusza G 《Environmental monitoring and assessment》2012,184(5):3267-3278
In soil magnetometry, two types of measurements are usually performed. The first type is measurements performed on the soil
surface, frequently using an MS2D sensor. The second type includes measurements of magnetic susceptibility carried out in
the soil profile, usually to a depth of about 30 cm. Up to now, such measurement results were analyzed separately. However,
it is possible and advantageous to integrate these two types of measurements. The goal of the study was to integrate measurements
of magnetic susceptibility performed on the soil surface and in the soil profile. More specifically, the goal was to obtain
3-dimensional spatial distributions of magnetic susceptibility of the topsoil horizon. Results show that it is possible to
effectively integrate measurements of magnetic susceptibility performed on the soil surface and in the soil profile. Moreover,
the 3-dimensional spatial distribution that is obtained shows the magnetic susceptibility of the top 20 cm of soil, which
includes the soil horizons where most of the heavy metals are accumulated. The analysis of such a spatial distribution can
be very helpful in delineating areas where the heightened magnetic susceptibility is a result of the influence of anthropogenic
pollution from those areas where it results from lithogenic origin. It is possible to investigate where the volumes of soil
with heightened magnetic susceptibility are located in the soil profile and in this way investigate which characteristic type
of soil profile it is. 相似文献
327.
Safety of patients and dental personnel requires the appropriate microbiological water quality in dental units. During treatment, patients and dental workers are exposed both to direct contact with bacteria-contaminated water in the form of splatter and with contaminated water aerosol emitted during work by unit handpieces, including rotating and ultrasonic instruments. The aim of the study was to determine the qualitative and quantitative contamination of water in dental unit reservoirs with aerobic and facultative anaerobic bacteria. The study material included water sampled from 107 dental unit reservoirs located in dental surgeries of public health centres. Conventional microbiological methods were used to identify microorganisms. The study shows that the contamination of water in dental unit reservoirs with aerobic and facultative anaerobic bacteria is commonplace. The mean concentration of mesophile bacteria in dental unit reservoir water exceeded 1.1?×?105 cfu/ml. The prevailing species were Gram-negative bacteria of the families Burkholderiaceae, Pseudomonadaceae, Ralstoniaceae and Sphingomonadaceae. The most numerous bacteria were Ralstonia pickettii, constituting 49.33 % of all the identified aerobic and facultative anaerobic bacteria. Among Gram-positive rods, the most numerous were bacteria of the genus Brevibacterium (5.83 %), while the highest percentage shares (13.25 %) of all Gram-positive microorganisms were found for Actinomyces spp. The study confirms the necessity of regular monitoring of microbial contamination of dental unit waterlines (DUWL) and use of various water treatment procedures available to disinfect DWUL. 相似文献
328.
329.
Morawska Kamila Jedlińska Katarzyna Smarzewska Sylwia Metelka Radovan Ciesielski Witold Guziejewski Dariusz 《Environmental Chemistry Letters》2019,17(3):1359-1365
Environmental Chemistry Letters - The increasing use of pesticides is a major health issue. There is therefore a need for improved analytical methods and more knowledge on the interaction of... 相似文献
330.
Ratajczak Ewa Szostak Aleksandra Bidzińska Gabriela Herbeć Magdalena 《Journal of Material Cycles and Waste Management》2018,20(1):402-413
Journal of Material Cycles and Waste Management - This article presents the results of studies, whose aim was to determine the volume of post-consumer wood waste resources in Poland and propose a... 相似文献