全文获取类型
收费全文 | 51篇 |
免费 | 0篇 |
专业分类
安全科学 | 2篇 |
环保管理 | 11篇 |
综合类 | 8篇 |
基础理论 | 21篇 |
污染及防治 | 6篇 |
评价与监测 | 1篇 |
社会与环境 | 2篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2019年 | 1篇 |
2018年 | 2篇 |
2013年 | 3篇 |
2009年 | 1篇 |
2008年 | 2篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2003年 | 1篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 2篇 |
1970年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有51条查询结果,搜索用时 31 毫秒
11.
Seasonal changes in the microbial communities of the New Calabar Riverwater have been investigated. Analyses of the BOD, pH, salinity, oil and grease levels of effluents of industries sited along the river were also conducted. High hydrocarbon-utilizing microbial populations were found. The percentage of hydrocarbon-utilizing heterotrophic bacteria ranged between 0–98% and 0–68% in the rainy and dry months, respectively. Counts of hydrocarbon-utilizing actinomycetes in the rainy months ranged between 0–95% and 2–55% in the dry months. The hydrocarbon-utilizing yeast population ranged between 1–95% and 2–85% for the rainy and dry months, respectively. Rainy month values for hydrocarbon-utilizing mould population ranged from 0–17% while dry month values ranged from 0–47%. The hydrocarbon-utilizing cyanobacterial population ranged between 0–95% and 0–33% in the rainy and dry months, respectively. Our results suggest that the heterotrophic bacterial and cyanobacterial populations are higher in the rainy months than in the dry months. However, the hydrocarbon-utilizing yeast, mould and actinomycete populations did not show seasonal variation. 相似文献
12.
This report contains a short theoretical proof for the non-optima lity of a uniform emission tax. A method recently suggested for finding the optimal level of a uniform tax is criticized. An alternative tax system that could be either uniform or non-uniform that is gradually increasing over time is suggested instead. The paper is aimed at stimulating discussions on theoretical and empirical grounds on the feasibility and efficiency of the suggested tax. 相似文献
13.
William A. Jury Gideon Sinai Lewis H. Stolzy 《Journal of the American Water Resources Association》1979,15(5):1444-1458
ABSTRACT: Electric generation facility water requirement will increase substantially in the future in the Western United States because new power plants are to be constructed at inland sites rather than on the coast. At the inland locations, power plants will have to compete with agriculture and public users for fresh water supplies, and will be constrained by environmental legislation to dispose of cooling waste water in lined evaporation ponds. The various options for power plant cooling are analyzed in respect to cost, water consumption, and environmental hazard, and also in respect to their compatibility with existing state and federal regulations. Several proposals for balancing the water requirements of various users in water-scarce areas are reviewed and criticized. 相似文献
14.
L. Fishelson 《Marine Biology》1973,19(3):183-196
Observations performed on coral colonies damaged during a very low tide on the shallow-water reef tables at Eilat (Red Sea), showed that most colonies are able to regenerate if parts of the living tissue remain intact on the skeletons. Brain-like corals, such asFavia favus andPlatygyra lamellina, were found to be more resistant to dessication than the delicate bush-like forms. It was also observed that the exposed skeletons of corals were immediately covered by a successive group of algae with a rich invertebrate epifauna among them. It is postulated that unpredicted extreme low water, occurring once in several years, could be the factor that prevents crowding on the reef tables, thus keeping high the level of coralspecies diversity.Supported, in part, by a grant from the Smithsonian Institution, USA. SFC-70074.This paper was presented at the Intecol Symposium held in Dubrovnik in March, 1972. 相似文献
15.
Mordechai Shohat MD Edna Akstein Bella Davidov Gad Barkai Cyril Legum Miriam David Hanna Dar Yitzhak Romem Aliza Amiel Hana Cohen Gideon Bach Ziva Ben-Neriah Ruth N. Sheffer Zvi Appelman Juan Chemke Pnina Zadka Tamy Zer Boleslaw Goldman 《黑龙江环境通报》1995,15(10):967-970
We investigated the contribution of different screening criteria to the prenatal detection of Down syndrome (DS) as well as other chromosomal anomalies in the Jewish population in Israel during 1990 and 1992. There was a significant decrease (P<0·03) in the incidence of DS live-births during 1992 (40:78 442) compared with 1990 (69:73 751) which paralleled a marked increase in total prenatal testing and in DS cases detected prenatally. Private laboratories, which perform amniocenteses mostly for women with a low risk of DS and without genetic counselling, had a significantly lower detection rate (1:917) compared with that of the genetic institutes, which following genetic counselling test both women ≥ 37 years of age (1:91) and women younger than 37 years (1:113). The detection of chromosomal anomalies other than DS was less affected by the reason for amniocentesis. Amniocentesis indicated by maternal serum marker screening of women younger than 37 years identified a greater number of chromosomal anomalies other than DS than amniocentesis based on age (≥37 years) alone (111:9604 versus 94:9810; P<0·06). Prenatal detection of DS is most effective when the indication for amniocentesis follows genetic counselling. The increasing use of maternal serum marker screening leads to a significant improvement in the positive detection rate of chromosomal anomalies other than DS in young women. 相似文献
16.
Rodlet cells have been found in the head and trunk kidneys of the common carp (Cyprinus carpio L.). From an experimental sample of 50 carps of various ages, we detected these cells in only seven fishes, contradicting the
hypothesis that they constitute a normal component of the fish epithelia. The rodlet cells have a typical structure: 12–16 μm
in diameter, with a basal nucleus various in form, and an encasing layer of fibrillar structure. The cells contain rodlets,
composed of elongated, opaque sacs featuring dark rods in the center, which strongly elongate in ripening cells. Remarkable
pseudopodia-like extensions from the apical parts of the rodlet cells penetrate into the delicate blood vessels and sinusoids
of the organs. The encasing layer at the cell apex then opens to release the rodlets into the bloodstream. No junctions were
found between the rodlet cells and neighboring cells. It is suggested that these cells comprise some kind of "symbiosis" between
leukocyte, possible granulocyte cells, and the parasitic rodlets. The cells serve the rodlets as an incubation chamber, as
well as a means of transportation into the bloodstream after ripening.
Received: 29 December 1998 / Accepted in revised form: 3 March 1999 相似文献
17.
L. Fishelson 《Marine Biology》1970,6(2):106-116
Approximately 22 species of sea anemones and 20 species of alcyonarians were found on the reef fringing the shallow water at Eilat (Gulf of Aqaba) and other localities along the Red Sea coast of the Sinai Peninsula. Investigations showed that these 2 groups of non-scleractinian coelenterates from (on different substrates) well identified colonies, part of them inhabiting sandy bottoms, other groups growing on the reef surface. Observations lead to the conclusion that several of the sea anemones and alcyonarians can act, under certain conditions, as factors limiting the development of hermatypic corals. In some areas, several species of the 2 groups of animals are found together with their symbiotic partners, such as fishes and crustaceans.This research has been sponsored partly by a grant from the Smithsonian Institution, No. SFC-7-0074 to L. B. Slobodkin (N. Y.) and L. Fishelson (T.-A.). 相似文献
18.
Israel Goldstein M.D. Peter Jakobi Gideon Shoshany Shlomo Filmer Ioseph Itskoviz Bar Maor 《黑龙江环境通报》1994,14(8):757-761
We add two cases of prenatally diagnosed late-onset isolated cystic hygroma to the eight cases reported previously in the English literature. The obstetrical significance, management, and outcome of this entity are reviewed. A retrospective study of late-onset isolated cystic hygromas delivered in one medical centre between 1978 and 1992 was made. The medical records of these newborns served as the basis of the present report. A Medline search of the English literature was carried out. Over a period of 15 years, we observed 11 cases of late-onset congenital isolated cystic hygroma, two of whom had prenatal sonographic diagnosis. In one case, a Caesarean section was performed due to a huge lesion. All cases underwent surgical excision with a favourable outcome. Of the eight prenatally diagnosed cases reported previously, one died at birth due to inability to ventilate and two required a tracheostomy. Late-onset isolated cystic hygroma should be differentiated from the early-onset nuchal cystic hygroma. The differential diagnosis is important, as late-onset isolated cystic hygroma does not require any prenatal intervention, but special awareness during labour and Caesarean section in extreme cases. Transport to a perinatal centre with expert neonatal, respiratory, and paediatric surgical care is recommended. The prognosis in general is favourable. 相似文献
19.
New business formation is a formidable and daunting task, which may require personal perseverance and self‐efficacy. If this is indeed the case, will entrepreneurs and non‐entrepreneurs differ on such attributes? Also, if high levels of perseverance and self‐efficacy help entrepreneurs to overcome setbacks, snags, and obstacles, do these positive attributes co‐occur with significant personal costs, such as the tendency to experience regretful thinking? This study uses a random sample of 217 patent inventors in the medical industry (surgery devices) to address these questions. Results indicate that entrepreneurs score significantly higher on self‐efficacy and on two distinct aspects of perseverance—perceived control over adversity and perceived responsibility regarding outcome of adversity—than did non‐entrepreneurs. Also, although entrepreneurs report the same number of regrets, their regrets are stronger and are qualitatively different from those reported by non‐entrepreneurs. These findings suggest that perseverance and self‐efficacy do indeed co‐occur with regretful thinking. Finally, post hoc analysis reveals that the higher the overall perseverance scores of patent inventors, the higher their annual earnings. We conclude by examining the implications for theory, researcher, and practice. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
20.
L. Fishelson 《Marine Biology》1999,133(2):345-351
The morphology and partial cytology of a group of bacteria-related organisms from the guts of surgeonfish are described.
These gigantobacteria symbionts are encountered in the guts of various species of this fish family throughout the Indo-Pacific
region and the Red Sea. They have been tentatively grouped and placed in a “family”, Epulopiscidae, according to the first
species described, Epulopiscium fishelsoni Montgomery and Pollak, 1988. In addition to a morphological comparison between the various forms from different species of
surgeonfish, suggestions are presented with regard to their possible morphological diversification during evolutionary and
host-species specificity.
Received: 10 June 1998 / Accepted: 29 October 1998 相似文献