全文获取类型
收费全文 | 62547篇 |
免费 | 2857篇 |
国内免费 | 42篇 |
专业分类
林业 | 2516篇 |
农学 | 1645篇 |
基础科学 | 429篇 |
6168篇 | |
综合类 | 14759篇 |
农作物 | 2461篇 |
水产渔业 | 2357篇 |
畜牧兽医 | 31052篇 |
园艺 | 643篇 |
植物保护 | 3416篇 |
出版年
2017年 | 554篇 |
2016年 | 537篇 |
2014年 | 540篇 |
2013年 | 1865篇 |
2012年 | 1203篇 |
2011年 | 1437篇 |
2010年 | 914篇 |
2009年 | 877篇 |
2008年 | 1427篇 |
2007年 | 1389篇 |
2006年 | 1371篇 |
2005年 | 1388篇 |
2004年 | 1318篇 |
2003年 | 1391篇 |
2002年 | 1355篇 |
2001年 | 1493篇 |
2000年 | 1477篇 |
1999年 | 1208篇 |
1998年 | 534篇 |
1997年 | 538篇 |
1995年 | 597篇 |
1994年 | 574篇 |
1993年 | 562篇 |
1992年 | 1309篇 |
1991年 | 1395篇 |
1990年 | 1450篇 |
1989年 | 1488篇 |
1988年 | 1399篇 |
1987年 | 1356篇 |
1986年 | 1400篇 |
1985年 | 1373篇 |
1984年 | 1152篇 |
1983年 | 1006篇 |
1982年 | 718篇 |
1981年 | 688篇 |
1980年 | 644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 11 毫秒
41.
42.
Canine distal renal tubular acidosis and urolithiasis 总被引:1,自引:0,他引:1
D J Polzin C A Osborne F W Bell 《Veterinary Clinics of North America: Small Animal Practice》1986,16(2):241-250
Distal RTA is characterized by decreased distal renal tubular hydrogen ion secretion, decreased ability to acidify urine, hypercalciuria, hyperphosphaturia, hypocitraturia, and metabolic acidosis. Because of the resulting alterations in urine composition and pH, patients with distal RTA are predisposed to urolithiasis and renal calcification. Diagnosis of distal RTA is important because it is a potentially reversible disorder that, left untreated, may cause nephrocalcinosis, recurrent urolith formation, moderate to severe metabolic acidosis, and renal failure. 相似文献
43.
44.
45.
Modell W 《Science (New York, N.Y.)》1939,89(2311):349-350
46.
Glock WS 《Science (New York, N.Y.)》1922,56(1452):484-485
47.
48.
The data obtained in the workshop provide further evidence that CH128A and IL-A26 and the 12 new mAbs that form a cluster recognise the bovine orthologue of CD2. The mAbs inhibit rosetting with SRBC, stain cells in primary and secondary lymphoid organs in patterns consistent with those obtained in humans with anti-CD2 mAbs, and the 11 IgG mAbs all immunoprecipitate a peptide with a Mr of 58-62 kDa. It is not clear from the studies whether the epitopes defined by the mAbs correspond with the region I and II epitopes present on CD2. None of the data suggest that any of the mAbs recognise the region III (CDD2R) epitope (Peterson and Seed, 1987; Knapp et al., 1989). Further studies are now needed to define the physical and functional relation of the epitopes and establish whether antibody-mediated activation corresponds with that noted in humans. Data reported in one study (Baldwin et al., 1988) with IL-A26 suggest possible differences in the requirements for activation. In addition, further studies are needed to demonstrate how many cell types express BoCD2. In mice, evidence has been presented which shows the mouse orthologue is expressed on some B cells (Yagitta et al., 1989). Studies in cattle have clearly shown CD2 is present on the majority of CD4+ and CD8+ T-cells and a small population of CD4-/CD8- cells (Baldwin et al., 1988; Davis, unpublished observations). Evidence presented in this workshop has shown that some CD2+ cells express a WC2 molecule (Sopp et al., 1991).(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
49.
Karen E. Bateman DVM MSc Pamela A. Catton Paul W. Pennock Stephen A. Kruth 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》1994,8(4):267-272
Eighteen dogs with malignant melanoma of the oral cavity were treated with high-dose per fraction (0–7–21) radiation therapy. Eight hundred cGy was administered on days 0, 7, and 21 for a total dose of 2,400 cGy in 3 weeks. Of 17 dogs evaluated, 9 (53%) had a complete remission and 5 (30%) achieved a partial remission with an overall response rate of 83%. Local failure occurred in 2 of the 9 dogs where a complete response was initially observed. One dog died of intercurrent disease, and one died of metastatic disease without evidence of local recurrence. Five dogs are alive and free of disease 9 to nineteen months from the initiation of therapy. The 0–7–21 protocol was well-tolerated, and acute radiation reactions were low-grade and limited to the skin. The results of this study demonstrate that oral melanomas in dogs are responsive to radiation. 0–7–21 radiation therapy offers a viable alternative to radical excision, especially when tumor volume or location would require cosmetically or functionally debilitating surgery. 相似文献
50.