全文获取类型
收费全文 | 32045篇 |
免费 | 2024篇 |
国内免费 | 1917篇 |
专业分类
林业 | 3142篇 |
农学 | 3638篇 |
基础科学 | 1703篇 |
5024篇 | |
综合类 | 6715篇 |
农作物 | 1371篇 |
水产渔业 | 1751篇 |
畜牧兽医 | 9362篇 |
园艺 | 759篇 |
植物保护 | 2521篇 |
出版年
2023年 | 277篇 |
2022年 | 510篇 |
2021年 | 751篇 |
2020年 | 763篇 |
2019年 | 763篇 |
2018年 | 751篇 |
2017年 | 933篇 |
2016年 | 903篇 |
2015年 | 1055篇 |
2014年 | 1053篇 |
2013年 | 1439篇 |
2012年 | 1473篇 |
2011年 | 1664篇 |
2010年 | 1509篇 |
2009年 | 1465篇 |
2008年 | 1546篇 |
2007年 | 1600篇 |
2006年 | 1507篇 |
2005年 | 1501篇 |
2004年 | 846篇 |
2003年 | 847篇 |
2002年 | 658篇 |
2001年 | 1118篇 |
2000年 | 1140篇 |
1999年 | 1155篇 |
1998年 | 675篇 |
1997年 | 623篇 |
1996年 | 574篇 |
1995年 | 531篇 |
1994年 | 483篇 |
1993年 | 423篇 |
1992年 | 610篇 |
1991年 | 610篇 |
1990年 | 480篇 |
1989年 | 429篇 |
1988年 | 395篇 |
1987年 | 395篇 |
1986年 | 290篇 |
1985年 | 221篇 |
1984年 | 189篇 |
1983年 | 164篇 |
1982年 | 109篇 |
1981年 | 106篇 |
1980年 | 89篇 |
1979年 | 144篇 |
1978年 | 94篇 |
1977年 | 73篇 |
1975年 | 77篇 |
1974年 | 79篇 |
1969年 | 70篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
122.
D E Granstrom R K Ridley Y Baoan L J Gershwin P M Nesbitt L A Wempe 《American journal of veterinary research》1989,50(4):571-574
Eight bovine hearts with lesions of eosinophilic myositis (EM) and 2 bovine hearts without EM lesions were collected at slaughter. Blood samples from these 10 hearts, and the heart of a newborn calf also were collected. Histologically, Sarcocystis cruzi was identified in the 8 hearts with EM lesions and the 2 hearts without EM lesions, but not in the heart of the newborn calf. Serum was harvested from the 10 blood samples and was used in homologous, modified, passive cutaneous anaphylaxis tests. Antigen was prepared from S cruzi bradyzoites isolated from the 2 hearts without EM lesions. Serum samples from the 8 cattle with EM lesions reacted positively to S cruzi antigen. When heat-inactivated IgE in serum (56 C for 4 hours) was used, all passive cutaneous anaphylaxis responses were considered negative. Using ELISA, serum IgE concentrations from the 10 cattle with and without EM lesions were 2.2 to 9 U/ml. As determined by radial immunodiffusion, IgM concentrations were 80 to 215 mg/dl. Immunoglobulin G concentrations were 420 to 2,050 mg/dl, but most were less than or equal to 1,700 mg/dl. Immunoglobulin A concentrations were 0 to 62 mg/dl; 1 steer with EM lesions had 0 mg/dl. Double-gel immunodiffusion confirmed the presence of Sarcocystis-specific precipitating antibodies. Sera from the 10 cattle with and without EM lesions formed at least 1 precipitin band. 相似文献
123.
The effects of abiotic variables on the response of carnation cultivars to Fusarium oxysporum f.sp. dianthi ( F.o. dianthi ) were examined in experiments conducted under semi-controlled environments. The abiotic variables examined were solar radiation intensity, temperature and growth substrate. Temperature was not controlled, but differed markedly among experiments, thus, its effect was not determined quantitatively. Disease incidence and disease severity varied significantly among the experiments (due mainly to differences in temperature), among the solar radiation treatments and among the cultivars tested. The three-way interaction term (i.e. cultivar × shade treatment × experiment) was highly significant ( P < 0.001) when both disease incidence and disease severity were considered, indicating that no single variable was predominant in determining disease intensity. The effects of the growth substrate on disease progress was examined in plants grown in tuff or in tuff mixed with peat (1 : 1 and 1 : 3) substrates. The growth substrate had a potent effect on disease development in the less susceptible cultivars. Severe epidemics developed in all cultivars when they were grown in the tuff/peat mixture, although some were resistant when grown in tuff alone. These results led to the conclusion that the carnation response to F.o. dianthi is substantially influenced by the environmental conditions of the test. 相似文献
124.
Renal specimens from 6 mink with encephalitozoonosis were studied by light and electron microscopy and immunohistochemistry. The glomeruli of affected kidneys had a mesangioproliferative glomerulonephritis which was characterized by an increase in mesangial cells and matrix in most glomeruli. Some glomeruli were partially or completely sclerosed. There were protein or granular casts in the cortical and medullary tubules. Interstitial nephritis, vasculitis and tubular cysts were found. Electron microscopy demonstrated extensive matrix and increased cellularity in the mesangial areas. Glomeruli showed segmentally thickened or wrinkled capillary basement membranes. Electron dense deposits were found in the glomerular basement membranes and mesangium. Peroxidase-anti-peroxidase immunohistochemistry demonstrated that IgG and IgM positive material was present as granular deposits in the glomerular basement membrane and occasionally in the mesangium. 相似文献
125.
红杂18是以红213为母本,黄苗试材9375为父本,配制成适宜罐藏加工和长途运销的番茄一代杂种。具有高抗TMV、中抗CMV、果实硬度高、抗裂、耐压、耐贮运、果实加工性状优良等特点。已在新疆、甘肃、宁夏、广西、云南等省区的加工番茄生产基地和远运外销生产基地推广649.8hm2。 相似文献
126.
Abstract. In Australia, stubble burning and tillage are two of the major processes responsible for the decline of soil organic carbon concentration in cropped soils, and the resulting soil degradation. However, the relative importance of these two practices in influencing the soil organic carbon concentration and the long-term impact on soil quality and productivity are not clear. The effects of stubble burning as practised by farmers in southeastern Australia were evaluated in two field trials, one of 19 years duration, the other of 5 years. Conventional tillage (three tillage passes) led to greater loss of soil organic carbon than stubble burning. Loss of total soil organic carbon attributed to stubble burning in the 0–10 cm layer was estimated to be 1.75 t C ha−1 over the period of the 19-year trial, equivalent to 29% of that lost due to tillage. In the 5-year trial, no change in soil organic carbon due to stubble burning was detectable. Changes in soil quality associated with stubble burning detected in the longer trial included a reduction in macro-aggregate stability, and increases in pH and exchangeable K+ . Only the latter two were detected in the shorter trial. A higher mean wheat yield (average 0.15 t ha−1 ) following stubble burning was observed in the 19-year trial but not in the 5-year trial. Research to monitor the longer term effects of stubble burning is needed, and to identify conditions where loss of soil organic carbon is minimized. 相似文献
127.
128.
春小麦优良变异类型的选择参数—协调指数 总被引:1,自引:1,他引:0
用分形理论的思想 ,对小麦分离与不分离群体内各单株性状组合特征进行系统分析 ,在不改变性状表达程度与群体分布状态的前提下 ,根据各单株的每一性状占各自群体最大值的比例数 ,及各比例数大小序号 ,求二者间双对数的回归斜率 ,作为该单株性状组合的协调指数。结果表明 ,该指数小 ,表示本单株各性状在表达程度上接近 ,说明性状间关系比较协调 ,否则即不协调。 相似文献
129.
130.