全文获取类型
收费全文 | 2272篇 |
免费 | 288篇 |
国内免费 | 609篇 |
专业分类
测绘学 | 44篇 |
大气科学 | 38篇 |
地球物理 | 215篇 |
地质学 | 481篇 |
海洋学 | 1463篇 |
天文学 | 4篇 |
综合类 | 248篇 |
自然地理 | 676篇 |
出版年
2024年 | 26篇 |
2023年 | 112篇 |
2022年 | 107篇 |
2021年 | 132篇 |
2020年 | 95篇 |
2019年 | 98篇 |
2018年 | 78篇 |
2017年 | 93篇 |
2016年 | 92篇 |
2015年 | 89篇 |
2014年 | 191篇 |
2013年 | 132篇 |
2012年 | 178篇 |
2011年 | 155篇 |
2010年 | 168篇 |
2009年 | 168篇 |
2008年 | 164篇 |
2007年 | 151篇 |
2006年 | 151篇 |
2005年 | 142篇 |
2004年 | 86篇 |
2003年 | 86篇 |
2002年 | 74篇 |
2001年 | 75篇 |
2000年 | 61篇 |
1999年 | 40篇 |
1998年 | 40篇 |
1997年 | 38篇 |
1996年 | 33篇 |
1995年 | 13篇 |
1994年 | 23篇 |
1993年 | 25篇 |
1992年 | 20篇 |
1991年 | 15篇 |
1990年 | 4篇 |
1989年 | 10篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有3169条查询结果,搜索用时 609 毫秒
71.
Mingyi WANG Xiaobing LIANG Yaping ZHENG Youzhi ZHAO Zhongqing WEI 《中国地球化学学报》2006,25(B08):65-66
The purpose of the thesis is to analyze the temporal and dimensional distribution of sulfate-reducing bacteria (SRB) groups and quantity in Lake Erhai. In April and September 2005, two sediment cores were collected from Lake Erhai. SRB groups were analyzed by PCR with six-groups primers designed according to the specific 16SrDNA sequence. FISH (fluorescence in-situ hybridization) was established with the oligonucleotide probe (SRB385) and utilized to analyze SRB quantity in the sediments. The results showed that in the sediments of Lake Erhai four SRB groups were detected except Desulfobacterium and Desulfobacter, meanwhile Desulfovibrio-Desulfomicrobium were detected only in autumn; different SRB groups had different temporal and dimensional distribution, and each group in autumn is distributed more widely than in spring; FISH used to count SRB in the sediments of fresh lake was set up successfully; the analysis of correlation between the sediment's depth and SRB quantity had statistical meaning (P〈0.05) . The result showed that SRB quantity showed a decreasing trend with increasing depth. Through the analysis of randomized block designed analysis of variance, the difference in SRB quantity between spring and autumn also had statistical meaning (P〈0.001), which revealed SRB quantity in autumn was larger than in spring; the result of FISH showed that there were some SRB in the deeper sediments in which no above-mentioned six SRB groups were detected by PCR. SRB groups in the sediments of Lake Erhai were rich, and the quantities of SRB groups in autumn were larger than in spring; possibly there were uncultivable SRB groups in the sediments of Lake Erhai. 相似文献
72.
Lichun LIU Yuting CHEN Kuanyu CHEN Jyhyih LEU Tsungkwei LIU 《中国地球化学学报》2006,25(B08):67-67
High concentrations of arsenic and humic substances in groundwater from the southwestern coastal plain of Taiwan were well known for their probable relationships with black-foot disease. In order to realize the relationships between the concentrations of humic substances and arsenic in this area, 24 well water samples were analyzed. After filtered through 0.45 μm glass fiber membrane in the field, samples were kept in the dark at 4℃ and then separated into six fractions with varying range of molecular weight (〈0.5, 0.5-1, 1-5, 5-10, 10-50 and 〉50 k Da) by ultrafiltration apparatus (Molecular/Por Stirred Cell system) in the lab. Concentrations of humic substances were measured by fluorescence spectrometer (HITACHI F-2000, ex=370, em=445) and arsenic by FIAS-AA (Perkin Elmer AAnalyst 100, FIAS-400). On average, only 6.2% of the total arsenic in water existed in the fraction of 〉0.5 k Da. and the others were complexed with humic substances (including humic acid and fulvic acid). The results demonstrated a distinct positive correlation between the concentrations of humic substances and arsenic. 相似文献
73.
Zhengji YI Kaixuan TAN Zhenxun YU Aili TAN Shiqiang WANG 《中国地球化学学报》2006,25(B08):125-126
Uranium processing and mining activities that generate many contaminants, such as high concentrations of U (VI), sulfate and heavy metals (Zn, Cu, Ni, etc), may pose a serious threat to the groundwater resources. In recent years, considerable research has been conducted respectively on two kinds of permeable reactive barriers (PRB), including zerovalent iron (ZVI) and sulfate reducing bacteria (SRB), for in-situ removal of these pollutants from groundwater. However, little investigation has been carried out on the potential benefits of bioaugmenting ZVI barriers to enhance the elimination of the pollutants by combining ZVI with SRB systems. The main goal of this study was to conduct batch and column experiments to determine whether the combination of SRB and ZVI can function synergistically and accelerate the rate of pollutant removal. The results of anaerobic batch experiments demonstrated that although the integrated ZVI/PRB system itself has no ability to reduce and remove sulfate directly, SRB can utilize hydrogen gas produced during the slow process of ZVI corrosion as an electron donor to raise biomass yields significantly and accelerate reductive sulfate removal. In particular, ferrous cations produced as the byproduct of ZVI corrosion process reacted with hydrogen sulfide from sulfate reduction and formed iron-bearing sulfide precipitates, which can stimulate the growth of SRB and promote sulfate removal activity by eliminating the biotoxicity of hydrogen sulfide. It was also shown that secondary mineral products (pyrite/ferrous sulfide) formed as a consequence of microbial sulfate reduction and ZVI corrosion process can enhance the microbial precipitation of soluble U (VI) as insoluble uraninite(uranium dioxide). 相似文献
74.
以三江平原狭叶甜茅(Glyceriaspiculosa)为研究对象,选取3个不同群落类型:狭叶甜茅优势种群落、狭叶甜茅和毛苔草(Carexlasiocarpa)为共建种的群落以及狭叶甜茅为主要伴生种的群落,共45个材料进行了ISSR分子标记分析。结果从41个引物中筛选出7个有效引物,扩增出80条清晰条带,平均每个引物扩增了11.4条带,其中70个位点是多态的,总的多态位点比率为87.5%,表明被测材料间ISSR标记多态性较高。利用Popgen(version1.32)软件分析了扩增结果,并得到了狭叶甜茅不同群落类型的遗传距离、遗传一致度、Nei和Shannon信息指数等遗传特征。结果表明,对于一个物种来说,当地理距离太近不能成为影响其遗传多样性水平的因素时,其构成的种群在群落中的地位将是影响遗传多样性水平的主要因素之一。 相似文献
75.
Christina A. Kellogg 《中国地球化学学报》2006,25(B08):218-219
Desert winds aerosolize several billion tons of soil-derived dust each year, including concentrated seasonal pulses from Africa and Asia. Huge dust events create an atmospheric bridge over continents and oceans, and eject a large pulse of soil-associated microorganisms into the atmosphere. These dust events might therefore have a role in expanding the biogeographical range of some microorganisms by facilitating rare long-distance dispersal events. The goal of this study is to characterize the microbes associated with African dust events and determine if they pose a risk to humans or downwind ecosystems. Air samples were collected by vacuum filtration in a source region (Mali, West Africa) during dust events and plated on R2A media to culture microorganisms. These organisms were compared to those in similar samples collected in the Caribbean during Saharan/Sahelian dust events. A high-volume liquid impinger is currently being tested in Barbados, collecting aerosol samples during African dust events. Over 100 bacteria and fungi (19 genera of bacteria and three genera of fungi) have been characterized from source region dust events. 相似文献
76.
本文对影响南极细菌S-15-13生长和胞外多糖产量的主要环境因子进行了研究,同时采用16S rDNA序列分析及系统发育分析方法对其进行了分子鉴定。结果表明:菌株S-15-13最佳产糖条件为:培养时间,56h;培养温度,8℃;碳源,1.0%葡萄糖;NaCl浓度,3.0%;pH,6.0-7.0。16S rDNA序列分析和系统发育分析表明,菌株S-15-13属于假交替单胞菌属(Pseudoaltero- monas)。 相似文献
77.
78.
79.
80.