全文获取类型
收费全文 | 67415篇 |
免费 | 3123篇 |
国内免费 | 688篇 |
专业分类
林业 | 3144篇 |
农学 | 2345篇 |
基础科学 | 919篇 |
7068篇 | |
综合类 | 16230篇 |
农作物 | 2721篇 |
水产渔业 | 2522篇 |
畜牧兽医 | 31762篇 |
园艺 | 789篇 |
植物保护 | 3726篇 |
出版年
2017年 | 722篇 |
2016年 | 709篇 |
2015年 | 682篇 |
2014年 | 747篇 |
2013年 | 2129篇 |
2012年 | 1543篇 |
2011年 | 1764篇 |
2010年 | 1249篇 |
2009年 | 1181篇 |
2008年 | 1706篇 |
2007年 | 1678篇 |
2006年 | 1640篇 |
2005年 | 1614篇 |
2004年 | 1425篇 |
2003年 | 1516篇 |
2002年 | 1477篇 |
2001年 | 1605篇 |
2000年 | 1600篇 |
1999年 | 1325篇 |
1998年 | 634篇 |
1997年 | 650篇 |
1995年 | 677篇 |
1994年 | 664篇 |
1992年 | 1378篇 |
1991年 | 1443篇 |
1990年 | 1486篇 |
1989年 | 1528篇 |
1988年 | 1418篇 |
1987年 | 1377篇 |
1986年 | 1409篇 |
1985年 | 1378篇 |
1984年 | 1153篇 |
1983年 | 1007篇 |
1982年 | 720篇 |
1981年 | 693篇 |
1980年 | 647篇 |
1979年 | 1127篇 |
1978年 | 916篇 |
1977年 | 819篇 |
1976年 | 768篇 |
1975年 | 860篇 |
1974年 | 1126篇 |
1973年 | 1063篇 |
1972年 | 1128篇 |
1971年 | 1080篇 |
1970年 | 1022篇 |
1969年 | 874篇 |
1968年 | 710篇 |
1967年 | 844篇 |
1966年 | 693篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
J. W. Claussen 《Forest Ecology and Management》1996,80(1-3):245-255
Current practices in many nurseries involve the germination of tropical rainforest seedlings in shaded conditions and transferral, at a later date, to environments with greater light intensities. Determination of the ability of these seedlings to acclimate to increased light intensities will allow seedling stock to be processed with maximum efficiency within the nursery. The acclimation abilities of three species, Agyrodendron actinophyllum, Cardwellia sublimis, and Flindersia brayleyana, commonly found in north Queensland's rainforests were investigated in this study. These particular species are highly valued for their cabinet timber qualities and are being reared in nurseries for use in reforestation trials and programs in north Queensland. Seedlings were initially raised in greenhouse conditions under two layers of shade cloth (16% of full sunlight) and then transferred into full sunlight at three different ages (3 weeks, 10 weeks, 14 weeks). Upon transfer, organ ratios and the direction of dry matter distribution was determined for each species and age group. Approximately 3 months after the seedlings were transferred, the acclimation ability of each species and age group was then determined. Dry matter distribution was found to change with age, irrespective of light environment. Individuals within a species with larger root systems and thicker or more dense leaves had a greater acclimation ability than those with smaller root systems and thinner or less dense leaves. Furthermore, individuals within a species whose dry matter distribution upon transfer was directed towards developing a large root system, and a small photosynthetic area and mass, had a greater acclimation ability than those whose dry matter distribution was directed away from such morphologies. Awareness of these relationships allows a better understanding of seedling response to gap formation in natural forests, and also allows plant nursery operators to make a more informed decision about when to move seedlings to environments with a higher light intensity. 相似文献
62.
J W McBride R E Corstvet D B Paulsen J R McClure F M Enright 《American journal of veterinary research》1992,53(10):1889-1894
Systemic and pulmonary antibody responses of calves to Pasteurella haemolytica were evaluated by measuring immunoglobulin production in blood for 9 days and in pulmonary lavage fluid for 7 days after intrapulmonary inoculation. Clinical signs, pulmonary lesions, pulmonary and systemic inflammatory response, and amount of antigen in lavage fluid were used to evaluate the response of calves to challenge with P haemolytica. The pulmonary response consisted of production of IgG, IgE, and IgM antibodies to P haemolytica antigens and a 17- to 68-fold increase of cells in lavage fluid 8 hours after inoculation, with a gradual decrease toward normal. Antibodies of the IgM isotype to P haemolytica were demonstrated as early as 8 hours through 7 days after inoculation in 3 of 3 calves. Of the anti-P haemolytica isotypes, IgM was found in the highest concentration. In all of the inoculated calves, IgE was found 1 to 2 days after inoculation, and IgG was found in 2 of 3 inoculated calves from day 1 through 7 after inoculation. Detection of IgG correlated with smaller pulmonary lesions. Immunoglobulin A was not detected in lavage fluid. Serum was evaluated for IgG and IgM antibody response to P haemolytica. Specific IgM was detectable 5 days after inoculation, and IgG was detectable 7 days after inoculation. Pasteurella haemolytica antigens were not detected in serum or plasma. A transient increase in neutrophil count was found 8 hours after inoculation, with return to baseline values by 24 hours after inoculation.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
63.
Analysis of ligand binding specificity of receptor chimeras 总被引:1,自引:0,他引:1
W A Catterall 《Science (New York, N.Y.)》1989,243(4888):236-237
64.
W L?scher 《DTW. Deutsche tier?rztliche Wochenschrift》1992,99(2):51-54
The article considers the attractions and dangers of homeopathic therapy from the view of a pharmacologist. Homeopathic drugs may exert pharmacodynamic (but also toxic) effects at low dilutions (D0-D6), but there is no scientific proof for specific effects of higher dilutions except for substances with a high toxic potential. Most homeopathic drugs have no reasonable basis for clinical use but, in case of toxic compounds, especially those with carcinogenic or allergic potential, homeopathy may bear risks for the animal and, because of residues in food animals, also for humans. Thus, homeopathic treatment should not be used when effective conventional treatments are available, and the use of homeopathic drugs with toxic potential should be avoided. 相似文献
65.
66.
G W De Lisle D M Collins H F Huchzermeyer 《The Onderstepoort journal of veterinary research》1992,59(2):163-165
Restriction endonuclease analysis and DNA hybridization revealed five ovine strains of Mycobacterium paratuberculosis from South Africa had identical DNA patterns to an ovine strain from Canada. Genetically this strain type has features in common with the two major groups of M. paratuberculosis. 相似文献
67.
J W Tyler J S Cullor M C Thurmond D W Hird K M Parker 《American journal of veterinary research》1989,50(1):126-130
Serologic recognition of common lipopolysaccharide core antigens has been related to enhanced resistance to gram-negative bacterial disease in several species. Class-specific titers (IgG, IgM) were determined by direct ELISA, using intact Escherichia coli (J5) as a plate antigen. Serum samples were obtained from 224 neonatal swine between the ages of 36 and 60 hours. The mean (+/- SEM) log10 IgG titer against gram-negative core antigens was 1:1,713 +/- 0.4718 and the mean log10 IgM titer was 1:202 +/- 0.5644. The IgG titer was directly related with litter size, birth weight, and serum total IgG concentration; IgM titer was directly related with dam parity and serum total IgG concentration. 相似文献
68.
69.
70.