全文获取类型
收费全文 | 89篇 |
免费 | 0篇 |
专业分类
废物处理 | 8篇 |
环保管理 | 6篇 |
综合类 | 22篇 |
基础理论 | 13篇 |
污染及防治 | 23篇 |
评价与监测 | 8篇 |
社会与环境 | 8篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 1篇 |
2021年 | 4篇 |
2018年 | 1篇 |
2017年 | 4篇 |
2016年 | 1篇 |
2015年 | 5篇 |
2014年 | 8篇 |
2013年 | 2篇 |
2012年 | 8篇 |
2011年 | 7篇 |
2010年 | 3篇 |
2009年 | 5篇 |
2008年 | 8篇 |
2007年 | 5篇 |
2006年 | 4篇 |
2005年 | 6篇 |
2004年 | 3篇 |
2003年 | 2篇 |
2002年 | 7篇 |
2000年 | 1篇 |
1993年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有89条查询结果,搜索用时 109 毫秒
31.
E. E. G. Clavico G. Muricy B. A. P. da Gama D. Batista C. R. R. Ventura R. C. Pereira 《Marine Biology》2006,148(3):479-488
In the Brazilian coast, high numbers of the small brittle star Ophiactis savignyi usually live associated with the sponge Geodia corticostylifera (Demospongiae, Geodidae), but not with other sympatric sponge species. In order to check whether this association was related
only with the physical shelter provided by the sponge body or was chemically mediated, the crude organic extract of G. corticostylifera was added to sponge mimics made of phytagel and spongin skeleton. Control and treated mimics were simultaneously offered
to previously sponge-associated O. savignyi in both static seawater and flow-through laboratory experiments. Ophiuroids were allowed to move towards the preferred mimic.
The defensive properties of the sponge extract against fish predation and fouling were also evaluated. Chemotaxis assays showed
that symbiotic ophiuroids were able to chemically recognize its host sponge, moving significantly more towards mimics containing
G. corticostylifera extract. Chemical deterrence assays showed that the natural concentration of the extract of this sponge was also able to
inhibit generalist fish predation on field experiments and the attachment of the common mussel Perna perna in laboratory assays. These results indicate that the crude extract of G. corticostylifera plays multiple functions in the marine environment, presumably being responsible for a closer association of this sponge
with O. savignyi, providing protection for this ophiuroid and inhibition of epibionts on itself. 相似文献
32.
Experimental design of Fenton and photo-Fenton reactions for the treatment of cellulose bleaching effluents 总被引:1,自引:0,他引:1
Multivariate experimental design was applied to the treatment of a cellulose conventional bleaching effluent in order to evaluate the use of the Fenton reagent under solar light irradiation. The effluent was characterised by the general parameters total organic carbon (TOC), chemical oxygen demand and color, and it was analysed for chlorinated low molecular weight compounds using GC–MS. The main parameters that govern the complex reactive system: Fe(II) and H2O2 initial concentration, and temperature were simultaneously studied. Factorial experimental design allowed to assign the weight of each variable in the TOC removal after 15 min of reaction. Temperature had an important effect in the organic matter degradation, especially when the ratio of Fenton reagents was not properly chosen. Fenton reagent under solar irradiation proved to be highly effective for these types of wastewaters. A 90% TOC reduction was achieved in only 15 min of treatment. In addition, the GC–MS analysis showed the elimination of the chlorinated organic compounds initially detected in the studied bleaching effluents. 相似文献
33.
Cassiduloids are currently rare irregular echinoids with a highly conserved adult morphology. Aristotle’s lantern is present
only during the post-metamorphic stage, and little is known about the early development of species in this group. Cassidulus mitis produces eggs of about 375 μm in diameter, lecithotrophic larvae with four reduced arms with skeletal fenestrated rods, cilia
along the body surface, and a ciliated band on arms and lobes. Offspring is brooded among the female spines from embryo to
settler’s stage. The echinopluteus larval stage is reached 6 days after fertilization, and the settler’s stage is formed at
the age of 17 days. Aristotle’s lantern appears around the thirteenth day of development. The lantern is well developed and
functional in settlers. It remains until at least 62 days after fertilization and can be used to acquire food from the environment.
The early development of C. mitis is unusual concerning features of typical lecithotrophic larvae (such as reduced arms), but retains some features of planktotrophic
larvae (such as skeletal rods and a ciliated band). Regarding egg size, early development in C. mitis seems to be transitioning from facultative lecithotrophic to typical obligate lecithotrophic pattern in echinoid larval evolution. 相似文献
34.
35.
36.
37.
Casadei Stefano Peppoloni Francesco Ventura Flaminia Teodorescu Razvan Dunea Daniel Petrescu Nicolae 《Environmental science and pollution research international》2021,28(21):26488-26499
Environmental Science and Pollution Research - In many countries, water supplies are limited and must be managed for different uses. Providing additional resources for irrigation can be an... 相似文献
38.
39.
An intertidal population of the fissiparous sea star Coscinasterias tenuispina (Lamarck, 1816) was sampled over a 1 year period at Ponta de Itaipu, Niterói, Rio de Janeiro. Gonadal indices revealed an annual reproductive cycle. Spawning occurred in the late winter and early spring between August and November. Pyloric caecal indices did not show a clear annual cycle or a reciprocal relationship with gonadal indices. The population appears to be sustained only by fission, as only males were found. Fission occurred throughout the year, but was most frequent in the winter (July, August and September). Incidence of fission was correlated with the occurrence of the extremely low tides during daytime that exposes many specimens to air. Austral winter tides are low by day and high by night, while the austral summer tides are low by night and high by day. The most extreme annual deviation in seawater temperature is about 5°C. Larval recruitment seems to be negligible, since very small individuals were not found. 相似文献
40.
Reproduction of Asterina stellifera was studied in two populations from the Cabo Frio region, southeastern Brazil. One was located in an intertidal seagrass
flat at Japonês Island (1994–1995); the second was on a sublittoral rocky shore at Pontal beaches (1999–2000). Reproductive
cycle was studied at monthly intervals by organ indices and histological examinations of gonads. Although these two populations
were studied in different habitats and at different times, the periodicity of the annual reproductive cycle was very similar
for the two populations. The highest gonad index (GI) values were found in August/September (late winter), followed by a drop
in GI values, indicating spawning. The GI and pyloric caeca index (PCI) tended to have an inverse relationship in both populations,
but it was only statistically significant in the rocky-shore population. Gametogenesis in the two populations was described
and roughly confirmed the reproductive cycles determined by GIs.
Published online: 9 August 2002 相似文献