全文获取类型
收费全文 | 1231051篇 |
免费 | 77446篇 |
国内免费 | 1976篇 |
专业分类
耳鼻咽喉 | 17624篇 |
儿科学 | 34259篇 |
妇产科学 | 30657篇 |
基础医学 | 175646篇 |
口腔科学 | 37354篇 |
临床医学 | 100420篇 |
内科学 | 243175篇 |
皮肤病学 | 27388篇 |
神经病学 | 97904篇 |
特种医学 | 48163篇 |
外国民族医学 | 104篇 |
外科学 | 193407篇 |
综合类 | 19800篇 |
现状与发展 | 1篇 |
一般理论 | 294篇 |
预防医学 | 86716篇 |
眼科学 | 29513篇 |
药学 | 94769篇 |
3篇 | |
中国医学 | 3077篇 |
肿瘤学 | 70199篇 |
出版年
2021年 | 9005篇 |
2019年 | 9660篇 |
2018年 | 16008篇 |
2017年 | 11882篇 |
2016年 | 13375篇 |
2015年 | 15187篇 |
2014年 | 18742篇 |
2013年 | 27516篇 |
2012年 | 40628篇 |
2011年 | 41661篇 |
2010年 | 23720篇 |
2009年 | 21083篇 |
2008年 | 39403篇 |
2007年 | 41894篇 |
2006年 | 42223篇 |
2005年 | 41237篇 |
2004年 | 39393篇 |
2003年 | 37987篇 |
2002年 | 36994篇 |
2001年 | 63541篇 |
2000年 | 66014篇 |
1999年 | 54769篇 |
1998年 | 12691篇 |
1997年 | 11000篇 |
1996年 | 10823篇 |
1995年 | 9975篇 |
1994年 | 9203篇 |
1992年 | 39392篇 |
1991年 | 37587篇 |
1990年 | 36399篇 |
1989年 | 35148篇 |
1988年 | 32010篇 |
1987年 | 31167篇 |
1986年 | 29172篇 |
1985年 | 27885篇 |
1984年 | 19893篇 |
1983年 | 16852篇 |
1982年 | 8855篇 |
1979年 | 18151篇 |
1978年 | 12264篇 |
1977年 | 10577篇 |
1976年 | 9231篇 |
1975年 | 10441篇 |
1974年 | 12542篇 |
1973年 | 11904篇 |
1972年 | 11346篇 |
1971年 | 10770篇 |
1970年 | 10179篇 |
1969年 | 9687篇 |
1968年 | 8998篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
We report a case of cervical necrotizing fasciitis (CNF) in a female having uncontrolled type II diabetes mellitus. The patient was presented to us after 20 days of preliminary symptoms. The aetiology of microbial inoculation in subdermal tissue was not known. The isolate was Staphylococcus aureus. In spite of the delay in presentation, the patient was successfully treated with combined antimicrobial and surgical intervention. 相似文献
82.
T. Svara M. Gombac M. Vrecl P. Juntes R. Kostanjsek A. Pogacnik M. Pogacnik 《Transboundary and Emerging Diseases》2006,53(1):26-29
Clinicopathological and electron microscopical findings of eight cases of enzootic nasal adenocarcinoma of sheep, diagnosed solely in one big flock in Slovenia between years 2001 and 2003 are described. All affected sheep were female, their mean age was 4.5 ± 1.5 years and they either belonged to the Istrian pramenka breed (five sheep) or were crossbreeds (three sheep). Tumours that arose from the ethmoid area of the nasal cavity were unilateral in six cases (75%) and bilateral in two cases (25%). All tumours were classified as adenocarcinomas by histopathological examination and they displayed either a combination of tubular and papillary growth or less often solely tubular proliferation. No metastases were detected in regional lymph nodes, brain or other organs. Electron microscopical studies performed on the reprocessed paraffin‐embedded tissues revealed the presence of the virus‐like particles with an average diameter between 70 and 90 nm. 相似文献
83.
Abstract Chorea is a rare complication of polycythaemia vera. Polycythaemic chorea occurs predominantly in females and usually in generalised
form. We present a 66-year-old woman with acute onset hemichorea-ballism with no vascular pathology in the basal ganglia region.
A clear relationship was observed between the onset of chorea and worsening of haematological parameters in the patient. After
repeated phlebotomies the patient's clinical status was improved. Polycythaemic chorea must be considered, especially in the
elderly, as early diagnosis leads to effective treatment and prevention of complications. 相似文献
84.
Gerald T Voelbel Marsha E Bates Jennifer F Buckman Gahan Pandina Robert L Hendren 《Neuropsychopharmacology》2006,60(9):942-950
BACKGROUND: Impaired neuropsychological test performance, especially on tests of executive function and attention, is often seen in children diagnosed with autism spectrum disorders (ASD). Structures involved in fronto-striatal circuitry, such as the caudate nucleus, may support these cognitive abilities. However, few studies have examined caudate volumes specifically in children with ASD, or correlated caudate volumes to cognitive ability. METHODS: Neuropsychological test scores and caudate volumes of children with ASD were compared to those of children with bipolar disorder (BD) and of typically developing (TD) children. The relationship between test performance and caudate volumes was analyzed. RESULTS: The ASD group displayed larger right and left caudate volumes, and modest executive deficits, compared to TD controls. While caudate volume inversely predicted performance on the Wisconsin Card Sorting Test in all participants, it differentially predicted performance on measures of attention across the ASD, BD and TD groups. CONCLUSIONS: Larger caudate volumes were related to impaired problem solving. On a test of attention, larger left caudate volumes predicted increased impulsivity and more omission errors in the ASD group as compared to the TD group, however smaller volume predicted poorer discriminant responding as compared to the BD group. 相似文献
85.
86.
87.
René Schwendimann Hugo Bühler Sabina De Geest Koen Milisen 《BMC health services research》2006,6(1):69
Background
Patient falls in hospitals are common and may lead to negative outcomes such as injuries, prolonged hospitalization and legal liability. Consequently, various hospital falls prevention programs have been implemented in the last decades. However, most of the programs had no sustained effects on falls reduction over extended periods of time. 相似文献88.
89.
90.
Rosario B Hidalgo Jerilyn Ross Jonathan R T Davidson 《Annals of clinical psychiatry》2006,18(3):157-162
BACKGROUND: Obsessive-compulsive disorder (OCD) is a chronic, impairing and often comorbid disorder. METHODS: 1000 subjects who called the Anxiety Disorders Association of America (ADAA) were surveyed and divided in three groups: (a) callers with OCD (OCD) and two overlapping control groups: (b) callers with no axis I disorder (NAC) and (c) with no-OCD (NOC) using a 97-item questionnaire. RESULTS: The rate of OCD was 14.5% (N = 145). Relative to the NOC group, OCD subjects were more likely to be female, White, younger and not married. Relative to the NAC group, subjects with OCD were more likely to be White, not married and younger. OCD was accompanied by significant comorbidity and was associated with an increased number of visits to health professionals than NAC subjects. There was no significant difference regarding unemployment rates among the three groups. However, OCD callers were more likely than both control groups to have missed work or have decreased productivity due to their mental condition. OCD subjects took an average of 1 psychotropic medication in the past year and were statistically more likely than the control groups to experience sleepiness and nervousness as side effects. CONCLUSIONS: OCD was fairly prevalent among ADAA callers and presented high levels of comorbidity, impairment, health care utilization and sensitivity to psychotropic side effects. 相似文献