全文获取类型
收费全文 | 280篇 |
免费 | 12篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 19篇 |
基础医学 | 29篇 |
口腔科学 | 6篇 |
临床医学 | 18篇 |
内科学 | 101篇 |
皮肤病学 | 4篇 |
神经病学 | 17篇 |
特种医学 | 39篇 |
外科学 | 19篇 |
综合类 | 3篇 |
预防医学 | 19篇 |
眼科学 | 1篇 |
药学 | 6篇 |
肿瘤学 | 14篇 |
出版年
2019年 | 1篇 |
2018年 | 6篇 |
2017年 | 5篇 |
2016年 | 1篇 |
2015年 | 4篇 |
2014年 | 8篇 |
2013年 | 10篇 |
2012年 | 1篇 |
2011年 | 4篇 |
2010年 | 10篇 |
2009年 | 4篇 |
2008年 | 10篇 |
2007年 | 10篇 |
2006年 | 7篇 |
2005年 | 19篇 |
2004年 | 2篇 |
2003年 | 4篇 |
2002年 | 1篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 9篇 |
1998年 | 12篇 |
1997年 | 12篇 |
1996年 | 19篇 |
1995年 | 14篇 |
1994年 | 14篇 |
1993年 | 15篇 |
1992年 | 4篇 |
1990年 | 2篇 |
1989年 | 8篇 |
1988年 | 9篇 |
1987年 | 9篇 |
1986年 | 7篇 |
1985年 | 9篇 |
1984年 | 5篇 |
1983年 | 4篇 |
1981年 | 5篇 |
1980年 | 6篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1977年 | 4篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1966年 | 1篇 |
1959年 | 2篇 |
1954年 | 1篇 |
1949年 | 1篇 |
1931年 | 1篇 |
1919年 | 1篇 |
1889年 | 1篇 |
排序方式: 共有298条查询结果,搜索用时 15 毫秒
101.
102.
103.
104.
Phenotypic markers and BCL-1 gene rearrangements in B-cell chronic lymphocytic leukemia: a Cancer and Leukemia Group B study 总被引:5,自引:0,他引:5
Newman RA; Peterson B; Davey FR; Brabyn C; Collins H; Brunetto VL; Duggan DB; Weiss RB; Royston I; Millard FE 《Blood》1993,82(4):1239-1246
The markers, CD11b, CD11c, CD14, CD21, CD23, CD25, CD38, and FMC7 were correlated with morphologic and other laboratory and clinical characteristics of 127 patients with untreated CD5+ chronic lymphocytic leukemia (CLL). Only CD38 and CD21 were significantly associated with atypical CLL morphology. The integrin associated markers CD11b and CD11c were associated with lower leukocyte count (white blood cell count [WBC]) and lower Rai stage. By contrast, the activation antigen CD23 was associated with a higher WBC, higher Rai stage, younger age group, and the presence of lymphadenopathy. Therefore, we conclude that CD23 positivity may reflect a more aggressive form of CLL, and CD11b and CD11c positivity a less aggressive form. The BCL-1 gene rearrangement was present in 5 of 84 (6%) CLL cases examined and was associated with atypical morphology and surface expression of CD11b. Patients with a BCL-1 gene rearrangement may represent a CLL subset or possibly a different B-cell disease. 相似文献
105.
GEORG M. FRÖHLICH M.D. BORIS SCHOCH B.Sc. MATHIAS WOLFRUM M.D. MARTIN OSRANEK M.D. FRANK ENSELEIT M.D. BERNHARD A. HERZOG M.D. MATHIAS HASUN M.D. THOMAS F. LÜSCHER M.D. PASCAL MEIER M.D. OLIVER GAEMPERLI M.D. PHILIPP A. KAUFMANN M.D. ROBERTO CORTI M.D. 《Journal of interventional cardiology》2014,27(1):50-57
Objectives
It remains still unclear whether the use of modern noninvasive diagnostic modalities for evaluation of coronary artery disease (computed tomography coronary angiography (CTCA), nuclear myocardial perfusion imaging (MPI)) were able to change the “diagnostic yield” of invasive coronary angiography (ICA).Methods
The total number of ICA in the years 2000–2009 was related to the number of percutaneous interventions (PCIs) and we assessed whether there was a significant trend over time using time series analyses. We compared these data with the number of patients undergoing CTCA and nuclear MPI in the same time period.Results
During the 10‐year observational period, 23,397 ICA were performed. The proportion of purely diagnostic ICA (without PCI) remained stable over the whole study period (tau = ?0.111, P = 0.721). A CTCA program was initiated in 2005 and 1,407 examinations were performed until 2009. Similarly, the number of nuclear MPI increased from 2,284 in the years 2000–2004 to 5,260 in the years 2005–2009 (P = 0.009).Conclusion
Despite increasing availability, noninvasive testing modalities did not significantly alter the rate of purely diagnostic ICA, and still are underused as gatekeeper to ICA. Further effort is needed to optimize the use of noninvasive imaging modalities in the work‐up process for coronary artery disease. (J Interven Cardiol 2014;27:50–57)106.
107.
The purpose of this study was to assess the influence of male, female and
fetal cord sera, follicular fluid, and seminal plasma on human sperm-zona
pellucida binding, using the hemizona assay. Steroids, gonadotrophins,
growth hormone and prolactin concentrations in follicular fluid and sera
were also analysed. The influence of follicular fluid (10 or 50%, v/v) and
sera (10%) on sperm-zona pellucida binding was investigated by
supplementing the sperm processing medium as well as the sperm-hemizona
incubation medium. Different seminal plasma concentrations (1 or 10%) were
added to the sperm-hemizona incubation medium. Supplementation with 10% day
3 donor serum was used as a control throughout experimentation. Although
supplementation with male sera and fetal cord serum exerted a stimulatory
effect (36 and 90% respectively; P < 0.029) on sperm-zona pellucida
binding, hemizona indices obtained with addition of male sera, fetal cord
serum and sera obtained from sub-fertile in-vitro fertilization (IVF)
patients on day 12 of their menstrual cycle did not differ significantly (P
> 0.05). Final progesterone concentrations in sperm-zona pellucida
incubation media (10% follicular fluid supplementation), which ranged from
0.788 to 3.85 microg/ml, enhanced sperm binding to the zonae by >100% (P
< 0.02). The utilization of follicular fluid (10%) as a natural
physiological stimulus to enhance sperm-zona pellucida binding in an IVF
setting is recommended. The presence of seminal plasma in the spermzona
pellucida incubation media showed no beneficial effect on the binding
ability of sperm, and can be viewed as an unfavourable substance in the
proximity of the oocyte.
相似文献
108.
A good result was achieved by treating ureteric perforation conservatively following ureteroscopy. 相似文献
109.
A sudden increase in factor VIII inhibitor development in multitransfused hemophilia A patients in The Netherlands. Dutch Hemophilia Study Group 总被引:2,自引:2,他引:0
Rosendaal FR; Nieuwenhuis HK; van den Berg HM; Heijboer H; Mauser- Bunschoten EP; van der Meer J; Smit C; Strengers PF; Briet E 《Blood》1993,81(8):2180-2186
The development of antibodies to factor VIII (inhibitors) in response to clotting-factor concentrates administration in hemophilia is common during the first few years of treatment but rare in multitransfused patients. We have investigated the possible association of a recently introduced factor VIII concentrate (Factor VIII CPS-P) in The Netherlands with the occurrence of inhibitors. To this effect, we conducted two studies. First, we performed a national multicenter study in which clinical information and inhibitor test results were obtained for 447 hemophilia A patients over the period 1988 through 1991. Secondly, for a baseline comparison we estimated the frequency of inhibitor development in a closely followed cohort of 144 patients, from 1984 through 1989. Before the introduction of Factor VIII CPS-P, the incidence of new inhibitors was 4.4/1,000 patient-years in the national study from March 1988 through May 1990, and 3.9/1,000 patient- years in the cohort followed from 1984 through 1989. These figures are similar to the incidence of new inhibitors that was found in a large cohort of patients in the United States followed in the 1970s. In the period that the new concentrate Factor VIII CPS-P was on the market, from June 1990 through November 1991, 11 clinically relevant inhibitors were detected, which yielded an incidence over this interval of 20.1/1,000 patient-years, a 4.5-fold increase compared with the previous interval (C195: 1.4 to 14.3). Nine of these 11 patients had in their lifetime received over 250 infusions with factor VIII preparations. whereas all of the inhibitors detected in the previous time interval, and all of the 24 inhibitor patients described in the US study, had received less than 250 infusions in their lifetime. All patients who developed inhibitors after June 1990 had been exposed to Factor VIII CPS-P, whereas only 75% of the patients who did not develop an inhibitor had been exposed to this product. In a prospective extension of the study, with a second inhibitor measurement after 3 months, we found that one additional inhibitor had developed during 52.5 patient-years of Factor VIII CPS-P use. In conclusion, there has been a sudden increase in the frequency of inhibitor patients, for a large part among multitransfused patients. It seems more than likely that this increase is associated with the introduction of a new factor VIII concentrate in The Netherlands.(ABSTRACT TRUNCATED AT 400 WORDS) 相似文献
110.