全文获取类型
收费全文 | 17085篇 |
免费 | 28篇 |
专业分类
林业 | 3638篇 |
农学 | 1303篇 |
基础科学 | 145篇 |
2895篇 | |
综合类 | 768篇 |
农作物 | 2120篇 |
水产渔业 | 1806篇 |
畜牧兽医 | 1412篇 |
园艺 | 1124篇 |
植物保护 | 1902篇 |
出版年
2023年 | 5篇 |
2022年 | 4篇 |
2021年 | 13篇 |
2020年 | 25篇 |
2019年 | 24篇 |
2018年 | 2752篇 |
2017年 | 2711篇 |
2016年 | 1196篇 |
2015年 | 78篇 |
2014年 | 27篇 |
2013年 | 47篇 |
2012年 | 834篇 |
2011年 | 2166篇 |
2010年 | 2126篇 |
2009年 | 1276篇 |
2008年 | 1353篇 |
2007年 | 1617篇 |
2006年 | 58篇 |
2005年 | 132篇 |
2004年 | 140篇 |
2003年 | 181篇 |
2002年 | 88篇 |
2001年 | 16篇 |
2000年 | 50篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 4篇 |
1996年 | 3篇 |
1994年 | 5篇 |
1993年 | 15篇 |
1992年 | 21篇 |
1991年 | 6篇 |
1990年 | 11篇 |
1989年 | 19篇 |
1988年 | 23篇 |
1987年 | 7篇 |
1986年 | 5篇 |
1985年 | 9篇 |
1984年 | 6篇 |
1983年 | 6篇 |
1982年 | 3篇 |
1980年 | 3篇 |
1977年 | 5篇 |
1975年 | 4篇 |
1974年 | 3篇 |
1972年 | 5篇 |
1971年 | 2篇 |
1970年 | 4篇 |
1968年 | 4篇 |
1966年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
Vinod Kumar Yadav Sandeep Kumar Ravindra K. Panwar 《Genetic Resources and Crop Evolution》2007,54(6):1285-1289
The present investigation was carried out on fifteen germplasm lines of Pisum sativum L. were used for characterization using Randomly Amplified Polymorphic DNA (RAPD) markers. While 12 random primers were taken,
out of them 11 primers gave amplification. These primers gave a total of 133 bands out of which 106 were polymorphic. Genetic
similarities of the RAPD profiles were estimated by using Jaccard’s coefficient with NTSYSpc 2.0 software. The similarity
index values ranged from 0.263 to 0.793 indicating the presence of enormous genetic diversity at molecular level. A dendrogram
generated by cluster analysis divided fifteen fieldpea genotypes into two Groups A and B. Major Group A have five genotypes
and major Group B have nine genotypes. 相似文献
992.
Seasonal patterns of root-surface phosphatase activities in a Mediterranean shrubland. Responses to experimental warming and drought 总被引:2,自引:0,他引:2
Mediterranean ecosystems are water limited and the current general circulation Models (GCM) and ecophysiological models forecast
a warming and a further increase of drought in the next decades. A stronger water stress can decrease the capacity for nutrient
absorption by plants. We conducted a field experiment to simulate forecasted drought and warming in a Mediterranean calcareous
shrubland to assess the performance of root-surface phosphatase activities of the dominant shrub Globularia alypum. These enzyme activities were higher in autumn and spring, when the climate conditions were optimal for plant activity, than
in summer or winter, when there was either lack of water or cold temperatures. A decrease in soil moisture in drought plots
decreased root-surface phosphatase activity (29% in summer and 25% in autumn). The decrease in root-surface phosphatase activity
in drought plots coincided with a decrease in P leaf concentrations and P accumulation in aboveground biomass and loss of
photosynthetic capacity of some dominant shrub species of this ecosystem, and with a tendency to increase total soil-P. These
results suggest that the expected drier conditions in this Mediterranean shrubland in the next decades will slow down the
P uptake by plants, thereby, diminishing the P contents in biomass and increasing total P contents in soil in non-available
forms and that this can be, in part, attributable to a result of the decrease in root-surface phosphatase activity. 相似文献
993.
Background, Aim and Scope
Contamination of soils does not only occur on their surface over large areas, but also in depth. Therefore a characterization
of soil state after pollution demands a three-dimensional soil sampling, by what a large number of samples has to be analyzed.
Analytical results could be evaluated by multivariate statistical methods, which have already been used for the evaluation
of data sets containing results from soil sampling of two dimensions like areas or single profiles. In this case study, multivariate
statistical methods were applied to investigate structure and interactions between features in a data set containing results
of three-dimensional soil sampling. The investigated soil profiles were contaminated by emissions of a former cement and phosphate
fertilizer plant. The aim of this study was to determine the remaining extent of contamination and to analyze whether pollutants
are mobilized and vertically transported within the profiles.
Materials and Methods:
Three soil profiles were sampled in the surroundings of the plant. Grain size, organic and carbonatic bonded carbon, pH value,
and the total contents of Ca, Cd, Co, Cu, F, Fe, K, Mn, Mg, Na, Ni, P, Pb, and Zn were determined. The resulting data set
was evaluated by cluster analysis, linear discriminant analysis, and principal components analysis. The sequential extraction
procedure according to Zeien and Brümmer was applied to analyze the binding properties of Ca, Cd, Cu, Na, Pb, and Zn from
selected samples.
Results:
Cd was identified as contaminant of the top soils. The pH values of the bottom soils were determined to be in alkaline range,
which is unnaturally high. Variables were clustered according to enrichment of variables in top soils. The samples were classified
regarding their pollution state and their substrate by cluster analysis, which was confirmed by linear discriminant analysis.
Geogenic and anthropogenic sources of variables as well as relationships between variables like the binding of heavy metals
at organic matter were detected by using principal components analysis. The binding of heavy metals at organic matter in the
top soils was confirmed by the results of the applied sequential extraction. A vertically altered distribution of Na binding
was determined.
Discussion:
According to the current soil conditions, the uptake of heavy metals had probably occurred by the over ground part of plants
during the deposition. The distribution of Na should likely result from the vertical transport of Na, which would also explain
the high pH values of the bottom soils by ion exchange. Altogether, the main amount of deposited Ca, F, Na, P, and heavy metals
is likely nearly insoluble bound in the top soils.
Conclusions:
Ten years after the end of production, the pollution of top soils in the surroundings of the former plant is still high. However,
regarding the ecotoxicological relevance the now explored interactions between several soil features and elements strongly
indicate that there is no short-term to medium-term risk of a mobilization of the deposited elements with the exception of
Na.
Recommendations and Perspectives:
The results of this case study prove that multivariate statistical methods are powerful tools to explore interactions of variables
and relationships in a data set derived from three dimensional soil sampling. The methods applied in this work can be highly
recommended for evaluations of large data sets resulting from two- or three-dimensional samplings. Multivariate statistical
methods enable the characterization of soils and their pollution state in a simple and economic way. 相似文献
994.
Xiao-Hua Qi Ming-Fang Zhang Jing-Hua Yang 《Genetic Resources and Crop Evolution》2007,54(8):1709-1716
Sequence variation of nuclear internal transcribed spacer regions of ribosomal DNA (ITS1, 5.8S rRNA and ITS2) from Chinese
vegetable mustards (AB-genome) and its putative parents Brassica rapa (the A-genome) and Brassica nigra (the B-genome) were used to investigate the molecular phylogeny and the probable evolutional pattern of this amphidiploid
species that uniquely formed in China. Totally, 16 accessions of Chinese vegetable mustard those covering nearly all the diverse
variations were included in this study, and together with three accessions of B. rapa and one accession of B. nigra. The results disclosed two strongly supported clades, one containing four accessions of vegetable mustard which have closer
relationship with B-genome species “B.nigra” lineage and the other containing 12 accessions of B. juncea and three A-genome accessions. This classification was in disagreement with the evidence from chloroplast DNA, mitochondrial
DNA, nuclear DNA restriction fragment length polymorphism (RFLP), which suggested that B. juncea was closely related to the A-genome type. For the incongruence, we speculated that the B. juncea crops derived from Chinese have evolved through different recombined events of the diploid morphutypes and evolved unidirectional
concerted evolution. The traditional phenotypic classification of B. juncea was not wholly supported by ITS results, and hence the phylogenetic relationships among these subspecies need to be reconsidered
on molecular level. 相似文献
995.
A new method for bovine embryo production: a potential alternative to superovulation 总被引:1,自引:0,他引:1
T A Kruip M C Pieterse T H van Beneden P L Vos Y A Wurth M A Taverne 《The Veterinary record》1991,128(9):208-210
Eight cows were used to study the feasibility of transvaginal ultrasound-guided puncture of follicles as a method for the collection of immature oocytes for embryo production in vitro. In six trials at intervals of seven days, 104 oocytes were collected. After in vitro maturation and fertilisation the 104 oocytes were transferred to the oviducts of sheep. Six days later, 75 oocytes were recovered by flushing the oviducts. Twenty-four per cent of the recovered oocytes/embryos had developed into transferable and viable morulae and, or, blastocysts. The data show that this non-surgical and repeated collection of immature oocytes can be used successfully for the in vitro production of bovine embryos. The procedure may produce yields of embryos comparable to those obtainable by conventional superovulation procedures. 相似文献
996.
997.
A study was conducted with the objective of obtaining a profile of farmers who have participated in the Farm Partnership Scheme
in Ireland. This scheme is a joint venture between Coillte (The Irish Forestry Board) and farmers. Under the terms of the
scheme, Coillte is responsible for the establishment, management and harvesting of the forest plantation on the farmer’s land.
The farmer retains ownership of the land, receives premium payments and shares in the harvesting profits. Fifty farmers who
joined the Farm Partnership Scheme between 1993–1997 were interviewed in 1999 and a detailed questionnaire was completed.
Survey results indicate that the typical farm partner was male, married and aged 50 years or older. Over half of those surveyed
had an off-farm job. The most popular reason for farmers opting to participate in the Farm Partnership Scheme was that they
did not have sufficient time to undertake the establishment and management of a forest plantation themselves. The average
size of forest established under the scheme was 23.7 ha, with Sitka spruce the most popular species planted. The average annual
payment under the scheme was €8077. For 46% of those surveyed, the returns from the Farm Partnership Scheme comprised all
of their farm income. 相似文献
998.
999.
Halofuginone lactate, given once orally at a dosage rate of 1,2 mg/kg body mass on the 1st, 3rd or 5th days of fever, resulted in the recovery of only 1 out of 5 splenectomized cattle. Three splenectomized animals, treated on the 1st as well as the 4th day of fever, recovered and were then carriers. Six untreated controls all died. The potential value of a chemotherapeutic agent for Theileria parva lawrencei infections in South Africa is discussed. 相似文献
1000.
Foot-and-mouth disease and the African buffalo (Syncerus caffer). 1. Carriers as a source of infection for cattle 总被引:1,自引:0,他引:1
R G Bengis G R Thomson R S Hedger V De Vos A Pini 《The Onderstepoort journal of veterinary research》1986,53(2):69-73
Ten pregnant buffalo cows, six of which were subsequently shown to be carriers of SAT 1, 2 and 3 viruses, were captured in the Kruger National Park (KNP) and allowed to calve in captivity. The buffalo cows and calves were separated by a fence from 6 FMD susceptible cattle but the buffalo and cattle were obliged to use common drinking troughs and hay racks. Over a period of 15 months, during which the buffalo calves lost their maternally-derived immunity, neither the buffalo calves nor the susceptible cattle became infected with FMD virus. By the end of the observation period, however, only 1 buffalo cow still had detectable virus in its oesophageal/pharyngeal specimens. 相似文献