全文获取类型
收费全文 | 3669篇 |
免费 | 281篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 26篇 |
儿科学 | 135篇 |
妇产科学 | 83篇 |
基础医学 | 453篇 |
口腔科学 | 27篇 |
临床医学 | 559篇 |
内科学 | 614篇 |
皮肤病学 | 63篇 |
神经病学 | 350篇 |
特种医学 | 156篇 |
外科学 | 473篇 |
综合类 | 91篇 |
一般理论 | 7篇 |
预防医学 | 339篇 |
眼科学 | 31篇 |
药学 | 187篇 |
3篇 | |
中国医学 | 2篇 |
肿瘤学 | 361篇 |
出版年
2023年 | 22篇 |
2021年 | 51篇 |
2020年 | 34篇 |
2019年 | 65篇 |
2018年 | 66篇 |
2017年 | 48篇 |
2016年 | 52篇 |
2015年 | 71篇 |
2014年 | 81篇 |
2013年 | 130篇 |
2012年 | 172篇 |
2011年 | 176篇 |
2010年 | 102篇 |
2009年 | 110篇 |
2008年 | 190篇 |
2007年 | 169篇 |
2006年 | 191篇 |
2005年 | 171篇 |
2004年 | 161篇 |
2003年 | 129篇 |
2002年 | 118篇 |
2001年 | 122篇 |
2000年 | 143篇 |
1999年 | 112篇 |
1998年 | 59篇 |
1997年 | 58篇 |
1996年 | 42篇 |
1995年 | 41篇 |
1994年 | 43篇 |
1993年 | 34篇 |
1992年 | 82篇 |
1991年 | 82篇 |
1990年 | 53篇 |
1989年 | 74篇 |
1988年 | 52篇 |
1987年 | 50篇 |
1986年 | 44篇 |
1985年 | 48篇 |
1984年 | 43篇 |
1983年 | 37篇 |
1982年 | 33篇 |
1981年 | 21篇 |
1980年 | 23篇 |
1979年 | 26篇 |
1978年 | 29篇 |
1977年 | 20篇 |
1976年 | 25篇 |
1975年 | 24篇 |
1974年 | 24篇 |
1973年 | 28篇 |
排序方式: 共有3960条查询结果,搜索用时 15 毫秒
1.
2.
R G O'Donnell L León Vintró G J Duffy P I Mitchell 《Applied radiation and isotopes》2004,60(2-4):539-542
The levels of residual radioactivity induced in Havar foils at the entrance of a high-pressure 18O-enriched water target used for the production of 18F- in a medical cyclotron with 16 MeV protons have been determined using high-resolution gamma-ray spectrometry. Whole body and skin dose rates arising from exposure to these foils during their periodic replacement have been estimated. The results indicate that irradiated foils do not represent a significant radiological hazard for the cyclotron operating staff and that no waste disposal difficulties should be encountered after an appropriate 'cooling' period of 2 years. 相似文献
3.
Several psychophysiological abnormalities associated with schizophrenia have been proposed as genetic trait markers of vulnerability to the disorder. Smooth pursuit eye tracking dysfunction and abnormal long latency event-related potentials are the most promising candidates. Both are independent of the effects of psychotropic medication or mental state at the time of testing, and twin studies demonstrate that each has a high level of heritability. Having recorded smooth pursuit eye tracking and event-related potentials in 20 high-density schizophrenic families, we find abnormalities in one or both measures in most of the families studied. The abnormalities, when present, occur in the family members with schizophrenia and other forms of functional psychosis, and they have a bimodal distribution with approximately half the nonschizophrenic relatives also showing eye tracking dysfunction and/or abnormal event-related potentials. Some of these relatives had psychiatric symptoms; others were normal. Our results suggest that psychophysiological examination can help to clarify the boundaries of schizophrenia spectrum disorder. By helping to decide the phenotypic status of nonschizophrenic family members, this should increase the power of DNA linkage studies. 相似文献
4.
Clinical aspects of pelvic inflammatory disease 总被引:2,自引:0,他引:2
Pelvic inflammatory disease (PID) is a common and poorly managed condition.
Untreated or inadequately treated, it leads to tubal infertility, ectopic
pregnancy and chronic pelvic pain. Diagnostic difficulties are compounded
by the wide variety of clinical presentations and the insensitivity and
poor specificity of laboratory tests. Better recognition of mild and
atypical disease needs a high index of suspicion whenever young, sexually
active women present with gynaecological symptoms. Laparoscopy supplemented
by microbiological tests and fimbrial minibiopsy should be regarded as the
diagnostic 'gold standard' for research studies; new studies are required
to identify techniques which might reduce under- and over-diagnosis. Early
treatment reduces the risk of an adverse effect on fertility. Any
therapeutic regimen selected should be effective against the common
aetiological agents Chlamydia trachomatis, Neisseria gonorrhoeae, genital
mycoplasmas and aerobic and anaerobic bacteria. Since at least 60% of cases
of PID can be attributed to infection with a sexually transmitted organism,
partner notification forms an essential part of management.
相似文献
5.
Dilatation and curettage (D+C) is the most common operation performed in Britain. The liberal use of D+C has been criticised.
The objective of this study was to evaluate the use of outpatient endometrial pipelle biopsy and determine its safety in terms
of detecting abnormalities. Complications and financial costs were also evaluated. Data were reviewed from an active gynaecological
unit from February 1993 to January 1995. A total of 303 D+Cs and 104 endometrial pipelle biopsies were performed in this period.
Nine malignancies were detected by D+C and 1 by pipelle biopsy. A total of 24 and 3 benign abnormalities were detected by
each method respectively. There was a higher complication rate in the D+C group but the failure rate was higher in the endometrial
pipelle biopsy group. The monetary savings over this period is estimated at £20,307. There were no missed malignancies to
our knowledge over the 8 yr period since endometrial pipelle biopsy was introduced to the hospital. 相似文献
6.
The pedicle patch urethroplasty provides an alternative single-stage vascularised graft procedure for the repair of moderately severe hypospadias. Over a 7-year period, 38 primary hypospadias repairs were performed employing this technique. The fistula rate was 18% in the 34 patients reviewed, but there were few other significant complications. The operation is recommended when the urethral plate can be preserved and the penis straightened in boys who are unsuitable for a meatal-based flap. 相似文献
7.
Michael F. Maguire Janet A. Latter Ravi Mahajan F. David Beggs John P. Duffy 《European journal of cardio-thoracic surgery》2006,29(6):873-879
Objective: Our aim was to investigate the prevalence of intra-operative nerve damage and its association with chronic pain. Methods: Our prospective study of 33 patients used nerve conduction studies to assess intercostal nerve function during elective thoracic surgical procedures. We used two methods to study nerve conduction: pre-operative magnetic stimulation (in 10 patients) and intra-operative nerve conduction studies (in all patients) We correlated these findings with specific intra-operative parameters, pain and psychological questionnaires pre-op and 3 month post-op and altered cutaneous sensation. Results: Magstim (magnetic stimulation) assessments were not reliable and were therefore abandoned. Intraoperative intercostal nerve studies revealed two distinct patterns of nerve injury and also that nerve injury was less in those cases where a rib was not resected. However, intercostal nerve damage detected at the time of operation is not associated with chronic pain or altered cutaneous sensation at 3 months post-op. Conclusions: The study findings suggest that either the amount of intra-operative intercostal nerve damage is not indicative of long-term nerve damage or that there is a more significant cause for chronic pain other than intercostal nerve injury. 相似文献
8.
Edward Black Jason Niamat Srikanth Boddu Antonio Martin-Ucar John P Duffy William Ellis Morgan Francis David Beggs 《European journal of cardio-thoracic surgery》2006,29(2):244-247
OBJECTIVE: There are limited and conflicting data available concerning the incidence of inadvertent splenectomy and its impact on the outcome in patients who have undergone oesophagectomy. The aim of this study is to identify the factors associated with a likelihood of inadvertent splenectomy and its influence on early and long-term outcome in patients having oesophagectomy for oesophageal carcinoma. METHODS: A consecutive series of 738 oesophagectomies performed between 1991 and 2004 was analysed. In our practice, the spleen was removed only if damaged intraoperatively. Routine chemo- and immunoprophylaxis would subsequently be used. Multivariate analysis with logistic and Cox models determined significant variables. RESULTS: Of the 738 oesophagectomies, 48 (6.5%) had splenectomy. Neoadjuvant chemotherapy was administered to a minority of patients; none subsequently had splenectomy. There were significant differences between types of operation (Ivor-Lewis 18 (9.0%), left thoracolaparotomy 14 (9.9%) and left thoracophrenotomy 15 (3.9%), p=0.01). Splenectomy was more common with advanced N stage disease (OR=0.44 [0.20-0.95]; p=0.04). Splenectomy resulted in more blood transfusions (median, 2 units vs 0 units; p=0.03) more anastomotic leaks (7 [14.6%] vs 42 [6.1%]; p=0.02) but not an increase in pulmonary complications (p=0.64) or in-hospital mortality (1 [4.6%] vs 37 [5.4%]; p=0.30). Splenectomy did not significantly affect median survival (551 [332-770] days vs 627 [554-700] days; p=0.63). CONCLUSION: Although inadvertent splenectomy increased the morbidity of oesophagectomy, it did not impair survival. Type of operation and advanced N stage are important risks for splenectomy. Though best avoided, most of the consequences of splenectomy can be managed. An unexpected relationship between splenectomy and anastomotic leaks needs further investigation. 相似文献
9.
10.