全文获取类型
收费全文 | 1972篇 |
免费 | 103篇 |
国内免费 | 3篇 |
专业分类
耳鼻咽喉 | 10篇 |
儿科学 | 30篇 |
妇产科学 | 47篇 |
基础医学 | 381篇 |
口腔科学 | 31篇 |
临床医学 | 174篇 |
内科学 | 282篇 |
皮肤病学 | 36篇 |
神经病学 | 331篇 |
特种医学 | 130篇 |
外科学 | 290篇 |
综合类 | 4篇 |
预防医学 | 100篇 |
眼科学 | 22篇 |
药学 | 119篇 |
肿瘤学 | 91篇 |
出版年
2022年 | 17篇 |
2021年 | 19篇 |
2020年 | 14篇 |
2019年 | 26篇 |
2018年 | 35篇 |
2017年 | 31篇 |
2016年 | 34篇 |
2015年 | 39篇 |
2014年 | 48篇 |
2013年 | 61篇 |
2012年 | 89篇 |
2011年 | 106篇 |
2010年 | 68篇 |
2009年 | 48篇 |
2008年 | 87篇 |
2007年 | 115篇 |
2006年 | 73篇 |
2005年 | 82篇 |
2004年 | 96篇 |
2003年 | 81篇 |
2002年 | 81篇 |
2001年 | 63篇 |
2000年 | 46篇 |
1999年 | 54篇 |
1998年 | 28篇 |
1997年 | 19篇 |
1996年 | 15篇 |
1995年 | 18篇 |
1994年 | 26篇 |
1992年 | 28篇 |
1991年 | 27篇 |
1990年 | 21篇 |
1989年 | 34篇 |
1988年 | 24篇 |
1987年 | 23篇 |
1986年 | 18篇 |
1985年 | 21篇 |
1984年 | 10篇 |
1982年 | 9篇 |
1979年 | 15篇 |
1978年 | 13篇 |
1976年 | 12篇 |
1975年 | 13篇 |
1972年 | 13篇 |
1970年 | 8篇 |
1969年 | 10篇 |
1965年 | 8篇 |
1935年 | 9篇 |
1932年 | 14篇 |
1924年 | 11篇 |
排序方式: 共有2078条查询结果,搜索用时 0 毫秒
1.
2.
H W Losken W M Morris P B Uys J W Earle P A Le Roux E Ackermann 《Suid-Afrikaanse tydskrif vir geneeskunde》1988,73(10):575-577
Trauma to the orbital region may result in fractures of the bony orbit, displacement of which gives rise to malposition of the eye and diplopia. If initial treatment is not feasible or is unsuccessful, later correction may be achieved by osteotomy or reduction and stabilisation of the bony fragments, often with bone grafts. Displaced medial or lateral canthi may need to be repositioned, where feasible in an overcorrected position. Where bone grafts are necessary, the skull is now favoured as the best donor site. 相似文献
3.
4.
H. -W. Ackermann P. Auclair S. Basavarajappa H. P. Emadi Konjin C. Savanurmath 《Archives of virology》1994,137(1-2):185-190
Summary Preparations of silkworm larvae contained two large phages with contractile tails (Myoviridae). One phage was active onPseudomonas paucimobilis. The other, not cultivated, was one of the largest viruses known. 相似文献
5.
Hess B; Hasler-Strub U; Ackermann D; Jaeger P 《Nephrology, dialysis, transplantation》1997,12(7):1362-1368
BACKGROUND: Metabolic evaluation in recurrent idiopathic calcium renal
stone-formers (RCSF) was analysed with respect to the following questions:
(1) do three 24-h urines provide more diagnostic accuracy in the metabolic
evaluation of RCSF than 1 or 2 urines?; (2) does time after stone event
influence the diagnostic yield?; (3) is urine composition at weekends
different from that at mid-week?; (4) what are the prevalences of the most
important risk factors (RF) of idiopathic calcium nephrolithiasis, i.e. low
volume (LV), hypercalciuria (HC), hyperoxaluria (HO), hyperuricosuria (HU),
hypocitraturia (Hypo-Cit), and hypomagnesiuria (Hypo-Mg)?; and (5) do male
RCSF differ from females with respect to urinary RFs? METHODS: Seventy-five
RCSF (59 men, 16 women) collected three 24-h urines (U1-3) while on
free-choice diet. To account for possible variations in lifestyle and diet,
U1 and U3 had to be collected midweek and U2 at a weekend. RESULTS: When
considering all three urines together (U1 + U2 + U3), the number of RF
abnormalities/patient was 2.8 +/- 0.1, higher than numbers of any
combination of two urines or of any single urine (P = 0.0001 for all
comparisons). The number of RF abnormalities also rose with time after
stone event, from 0.8 +/- 0.1 (range 0-4) in U1 to 1.1 +/- 0.1 (range 0- 4)
in U3 (P = 0.011 vs U1). Whereas all other RF did not change between
collections, urine volume was lower in U2 (1793 +/- 90 ml) than in U1 (2071
+/- 97 ml, P = 0.0001 vs U2) and U3 (1946 +/- 97 ml, P = 0.046 vs U2). At
least 1 abnormality was found in 85.3% of all RCSF, and multiple
abnormalities occurred in 47%. The most frequent RF was HC (39%), followed
by HO and LV (32% each), Hypo-Cit (29%), HU (23%) and Hypo-Mg (19%). Males
more often had Hypo-Cit (P < 0.001) and Hypo-Mg (P < 0.01) than
females, whereas HO was more frequent in female RCSF (P < 0.025 vs
males). CONCLUSIONS: Diagnostic accuracy of metabolic evaluation in RCSF
increases both with the number of urines collected and the time passing
after a stone event. Urines collected at weekends differ from those of the
week only by their lower volumes. Abnormalities of RF for calcium
nephrolithiasis can be detected in 85.3% of RCSF, and HC is the most common
RF both in male and female RCSF.
相似文献
6.
7.
Two patients were seen with malignant neoplastic emboli to the coronary arteries. One, a 61-year-old woman with a malignant fibrous histiocytoma of the thigh and a solitary pulmonary metastatic lesion, died of an acute myocardial infarction due to a neoplastic coronary embolus after lobectomy. The other, a 51-year-old woman with bronchogenic adenocarcinoma, died of extensive cerebral metastases. At autopsy, she also was found to have had an acute myocardial infarction associated with a neoplastic coronary embolus. 相似文献
8.
9.
Glycoprotein B of bovine herpesvirus type 4: Its phylogenetic relationship to gB equivalents of the herpesviruses 总被引:1,自引:0,他引:1
Michael Goltz Hermann Broll Annette Mankertz Wolfgang Weigelt Hanns Ludwig Hans-Jörg Buhk Kerstin Borchers 《Virus genes》1994,9(1):53-59
In order to estimate the phylogenetic relationship of BHV-4 among the herpesviruses, we have cloned and sequenced its glycoprotein B (gB). The 2.6 kb open reading frame codes for a 874 amino acid long protein. The comparison of its deduced amino acid sequence with those of its counterparts in 19 distinct herpesviruses groups BHV-4 into the -herpesvirinae. The calculation of an evolutionary tree emphasized that BHV-4 is more closely related to herpesvirus saimiri (HVS) than to Epstein-Barr virus (EBV). However, in contrast to EBV and HVS, the gB of BHV-4 contains a putative protease cleavage site and 20 potential N-glycosylation sites. The alignment of the amino acid sequences revealed that 10 cysteine and 7 proline residues, as well as the motifs SPF and GQLG, were completely conserved among the 20 investigated gBs. 相似文献
10.
Elisabeth Puchhammer-Stckl Wolfgang Mor Michael Kundi Franz-Xaver Heinz Hanns Hofmann Christian Kunz 《Journal of medical virology》1994,43(2):143-147
Serum samples from 46 children with chronic and probably transfusion acquired hepatitis were tested for the presence of hepatitis C virus (HCV) RNA by a “nested” polymerase chain reaction (PCR) assay, to judge a possible risk of HCV transmission from these patients. In 73% of the samples, viral RNA was detected, indicating a high virus prevalence in this patient group. High titers of HCV-RNA were observed in some sera as shown by the detection of virus in some samples even at dilutions of 10?3. Comparison of simultaneously obtained PCR results and ALT values revealed no significant correlation between virus presence in serum and higher ALT levels. It was, however, shown that unusually high ALT values may reflect a high titer of viral RNA in serum. To investigate the prevalence of viral RNA in saliva, which could be a vehicle of virus transmission, 35 throat washing samples from the HCV-infected children were screened by PCR. Using three different sample preparation procedures, 20% of the throat washings were found to be positive for HCV-RNA. This indicates a prevalence of virus in this fluid lower than that reported previously. © 1994 Wiley-Liss, Inc. 相似文献