全文获取类型
收费全文 | 19167篇 |
免费 | 1033篇 |
国内免费 | 2172篇 |
专业分类
林业 | 1576篇 |
农学 | 2229篇 |
基础科学 | 1517篇 |
2806篇 | |
综合类 | 7353篇 |
农作物 | 1272篇 |
水产渔业 | 663篇 |
畜牧兽医 | 3059篇 |
园艺 | 929篇 |
植物保护 | 968篇 |
出版年
2024年 | 153篇 |
2023年 | 410篇 |
2022年 | 872篇 |
2021年 | 1060篇 |
2020年 | 946篇 |
2019年 | 893篇 |
2018年 | 606篇 |
2017年 | 920篇 |
2016年 | 749篇 |
2015年 | 1010篇 |
2014年 | 998篇 |
2013年 | 1213篇 |
2012年 | 1382篇 |
2011年 | 1494篇 |
2010年 | 1356篇 |
2009年 | 1111篇 |
2008年 | 1168篇 |
2007年 | 975篇 |
2006年 | 923篇 |
2005年 | 725篇 |
2004年 | 417篇 |
2003年 | 348篇 |
2002年 | 387篇 |
2001年 | 403篇 |
2000年 | 336篇 |
1999年 | 272篇 |
1998年 | 186篇 |
1997年 | 166篇 |
1996年 | 125篇 |
1995年 | 119篇 |
1994年 | 115篇 |
1993年 | 88篇 |
1992年 | 88篇 |
1991年 | 83篇 |
1990年 | 44篇 |
1989年 | 49篇 |
1988年 | 45篇 |
1987年 | 34篇 |
1986年 | 24篇 |
1985年 | 7篇 |
1984年 | 17篇 |
1982年 | 3篇 |
1981年 | 6篇 |
1980年 | 3篇 |
1975年 | 3篇 |
1972年 | 3篇 |
1970年 | 6篇 |
1930年 | 2篇 |
1925年 | 2篇 |
1924年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
The heterogenicity of Cowdria ruminantium stocks: cross-immunity and serology in sheep and pathogenicity to mice 总被引:2,自引:0,他引:2
J L Du Plessis L Van Gas J A Olivier J D Bezuidenhout 《The Onderstepoort journal of veterinary research》1989,56(3):195-201
Ten stocks of Cowdria ruminantium (Ball 3, Breed, Comoro, Germishuys, Kümm, Kwanyanga, Mali, Mara, Nonile and Welgevonden) were compared from a cross-immunity, serological and mouse pathogenicity point of view. They were found to differ in varying degrees. Except for the Ball 3, Comoro and Germishuys stocks that were similar but not identical, there was no pattern in the antigenic diversity of the 10 stocks. The Welgevonden stock emerged as the stock that elicits an immunity against most of the South African stocks. The inability of the reference Ball 3 stock to protect sheep against no fewer than 6 other stocks questions the advisability of retaining this stock as the vaccine stock. The antigenic diversity of the 10 stocks could not be correlated with the antibody levels detected with the indirect fluorescent antibody test, since the sera against all 10 stocks reacted positively to the Kümm stock antigen and the variation in titres was not stock-related. 相似文献
3.
J L Du Plessis C Gray M F Van Strijp 《The Onderstepoort journal of veterinary research》1992,59(4):337-338
A 3-fold increase in the numbers of Lyt-2+ T cells in the circulating blood of mice infected and re-infected with the Welgevonden stock of Cowdria ruminantium, as determined by flow cytometry, is supportive evidence that immunity in heartwater is cell-mediated. The rise in Lyt-2+ cells only after re-infection of the mice is further evidence that the development of immunity in heartwater is dependent on the unhindered and adequate replication of C. ruminantium. 相似文献
4.
陕甘宁老区脆弱生态环境定量评价——以榆林、延安两市为例 总被引:4,自引:0,他引:4
位于黄土高原中部的陕甘宁老区生态环境极为脆弱 ,近年来由于气候、人类开发资源等自然和人为原因 ,使生态环境的脆弱程度升高。选定年降水量、年均温、蒸发量等 8个指标 ,定量评价各县 1 970 - 2 0 0 0年的脆弱度状况 ,结果表明榆林、延安两市生态环境整体脆弱 ,脆弱度存在空间差异但差异不明显 ,时间段上的波动幅度不大。陕甘宁老区脆弱生态环境具有不稳定性 ,对外界干扰较敏感。 相似文献
5.
6.
AIM: To investigate the relationship between somatostatin and the pathologic type, estrogen receptor,DNA ploidy of nuclei in tumor cells of breast cancer.METHODS: 67 cases of primary breast cancer and 25 cases of benign breast tumor were examined by immunohistochemical stretomyces avidin peroxidase method. 26 cases of breast cancer selected at random were analyzed by flow cytometry.RESULTS: Somatostatin expressed significantly higher in low malignant breast cancer than that in high malignant breast cancer (P<0.05). Most of cancers with positive staining of somatostatin were diploidy,most of cancers with negative staining were aneuploidy,there had significant difference between two groups (P<0.05).CONCLUSION: Somatostatin may delay the progress of breast cancer,and somatostatin levels in cancer tissues may become a useful indicator for assessing prognosis of patients with breast cancer. 相似文献
7.
AIM: To investigate the anti-metastasis effect of weimaining, extracted from fragopyrum cymosum meissn, a Chinese medicine, on murine Lewis lung carcinoma (3LL). METHODS: The anti-metastasis effect of weimaining in vivo was detected in the grafting lung metastasis model of murine Lewis lung carcinoma. The effects of the drug on the expression of CD34 and E-cadherin were investigated by immunohistochemical staining and RT-PCR. RESULTS: Weimaining effectively inhibited the lung metastasis of 3LL at a concentration of 250 mg·kg-1·d-1, significantly suppressed the expression of CD34 and increased the expression levels of E-cadherin protein and mRNA in 3LL cells. CONCLUSIONS: Weimaining inhibits the metastasis of murine Lewis lung carcinoma (3LL) in vivo via increasing the expression of E-cadherin and decreasing microvessel density of tumor tissue. 相似文献
8.
9.
目的 对从淳昌郡购买的3种不同的清麹酱,Kim Yong-Soon清麹酱(K-chungkukjang),Hyang Juk-Won清麹酱(H-chungkukjang)和Moon Ok-Rae清麹酱(M-chungkukjang)进行癌细胞体外抗癌效果评价.方法 MTT试验和细胞生长抑制试验.结果 样品浓度1.0 mg/ml下分别对AGS和HT-29癌细胞进行处理,K-清麹酱具有最高的癌细胞生长抑制效果(87% and 86%).K-清麹酱能够抑制癌细胞生长速度且呈时间依赖性.结论 K-清麹酱的外抗癌效果优于其他清麹酱. 相似文献
10.
研究基于硬叶兜兰(Paphiopedilum micranthum)表型变异,通过相关性、主成分以及聚类等分析,对9个硬叶兜兰野生居群的22个表型性状指标进行了调查研究,探究硬叶兜兰居群间及居群内表型多样性,为硬叶兜兰资源的进一步保护和利用奠定基础。结果表明:硬叶兜兰在居群间具有丰富的表型多样性,居群内变异较少。平均表型分化系数(Vst)为64%,居群间表型分化高于居群内表型分化。22个性状的平均变异系数(CV)范围为9.52%~31.48%,9个居群平均变异系数为14.55%~18.51%,在表型间差异显著,在居群间差异不显著。主成分分析表明,花纵径等花部性状和株高等营养性状是硬叶兜兰变异的主要因素。Pearson相关性分析表明,株高、中萼片长和花瓣长与大部分性状都呈现显著正相关;冠幅、叶片数等营养性状与海拔存在显著正相关性,而花横径、花纵径等生殖性状与海拔存在显著或极显著负相关性。聚类分析结果表明,9个居群可以聚类为3个类群,和硬叶兜兰地理分布距离一致。 相似文献