首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   9596篇
  免费   766篇
  国内免费   194篇
耳鼻咽喉   90篇
儿科学   161篇
妇产科学   71篇
基础医学   1167篇
口腔科学   156篇
临床医学   1351篇
内科学   1020篇
皮肤病学   97篇
神经病学   863篇
特种医学   309篇
外国民族医学   1篇
外科学   705篇
综合类   1414篇
现状与发展   1篇
一般理论   1篇
预防医学   893篇
眼科学   90篇
药学   992篇
  16篇
中国医学   535篇
肿瘤学   623篇
  2025年   3篇
  2024年   145篇
  2023年   222篇
  2022年   339篇
  2021年   426篇
  2020年   421篇
  2019年   481篇
  2018年   420篇
  2017年   383篇
  2016年   320篇
  2015年   329篇
  2014年   569篇
  2013年   617篇
  2012年   531篇
  2011年   566篇
  2010年   513篇
  2009年   578篇
  2008年   571篇
  2007年   602篇
  2006年   486篇
  2005年   364篇
  2004年   271篇
  2003年   266篇
  2002年   224篇
  2001年   170篇
  2000年   141篇
  1999年   121篇
  1998年   64篇
  1997年   53篇
  1996年   57篇
  1995年   51篇
  1994年   37篇
  1993年   40篇
  1992年   20篇
  1991年   27篇
  1990年   14篇
  1989年   24篇
  1988年   12篇
  1987年   12篇
  1986年   11篇
  1985年   16篇
  1984年   10篇
  1983年   2篇
  1982年   5篇
  1981年   4篇
  1980年   8篇
  1979年   4篇
  1978年   3篇
  1976年   2篇
  1974年   1篇
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
1.

Context

Family caregivers constitute a critical component of the end-of-life care system with considerable cost to themselves. However, the joint association of terminally ill cancer patients' symptom distress and functional impairment with caregivers' subjective caregiving burden, quality of life (QOL), and depressive symptoms remains unknown.

Objectives/Methods

We used multivariate hierarchical linear modeling to simultaneously evaluate associations between five distinct patterns of conjoint symptom distress and functional impairment (symptom-functional states) and subjective caregiving burden, QOL, and depressive symptoms in a convenience sample of 215 family caregiver–patient dyads. Data were collected every 2 to 4 weeks over patients' last 6 months.

Results

Caregivers of patients in the worst symptom-functional states (States 3–5) reported worse subjective caregiving burden and depressive symptoms than those in the best two states, but the three outcomes did not differ between caregivers of patients in State 3 and States 4–5. Caregivers of patients in State 5 endured worse subjective caregiving burden and QOL than those in State 4. Caregivers of patients in State 4 suffered worse subjective caregiving burden and depressive symptoms but comparable QOL to those in State 2.

Conclusion

Patients' five distinct, conjoint symptom-functional states were significantly and differentially associated with their caregivers' worse subjective caregiving burden, QOL, and depressive symptoms while caring for patients over their last 6 months.  相似文献   
2.
A case report is presented in which a patient's initial complaint is of blurred vision after exercise (Uhthoffs symptom). Visual acuity and colour vision were found to be reduced after exercise. Additional neurological signs included homonymous scotomata and delayed visual evoked and somatosensory responses. Magnetic resonance imaging demonstrated multiple abnormal lesions in the brain. The significance of this symptom and its relationship to multiple sclerosis are discussed.  相似文献   
3.
Abstract: We observed a case of withdrawal after abrupt discontinuation of mianserin. A 41-year-old woman was treated according to a diagnosis of depression, which was her 6th episode. Mianserin 30 mg/day, etizolam 1 mg/day and flunitrazepam 1 mg/day were administered. When the patient discontinued taking the drugs by herself because of subsiding of these symptoms, severe panic anxiety appeared. This panic anxiety was not relieved by taking etizolam and flunitrazepam again, but subsided rapidly by the re-administration of mianserin 30 mg/day, and because of that the depressive symptom also disappeared.
From these experiences panic anxiety seemed to be a withdrawal symptom, and involvement of the noradrenergic system in panic anxiety as well as serotonergic system was suggested.  相似文献   
4.
Radiation-induced bone tumors in beagle dogs exposed to 90Sr have been evaluated in terms of their incidence, time of appearance, occurrence as multiple tumors, anatomic distribution, and the influence of sex on their development. Among dogs fed 90Sr during skeletal development, the incidence of bone tumors was dose dependent. Tumors thus appeared in 10 of 19 dogs receiving average skeletal doses of 130 Gy, 15 of 60 receiving 97 Gy, 5 of 61 receiving 61 Gy, 2 of 65 receiving 26 Gy, and 1 of 40 receiving 1.3 Gy. No tumors appeared among 66 dogs who received 8 Gy, 78 who received 0.3 Gy, and 80 non-irradiated controls, all of which have been observed for life. Among dogs given a single intravenous injection of 90Sr in early adulthood, tumor production was somewhat higher than among 90Sr-fed dogs at the same radiation dose: bone tumors were present in 6 of 25 dogs who received 62 Gy and 1 of 20 dogs who received 7.5 Gy. Bone tumors appeared sooner and were more often multiple in animals receiving the higher doses. Long bones were the sites of most of the tumors appearing after the highest dose level. Bones of the head, particularly the mandible, were the predominant site of tumors in the next highest dose level group.  相似文献   
5.
心理干预前后药物流产妇女SCL-90测评结果对比分析   总被引:2,自引:0,他引:2  
目的:探讨心理干预对药物流产妇女心理状态及药物流产效果的影响。方法:将451例药物流产妇女随机分为研究组和对照组,首诊和服用米索前列醇前采用症状自评量表分析系统SCL-90评定心理状态的变化,并对药物流产过程进行效果评价。结果:研究组经心理干预后绝大多数因子分降低(P<0.05),但仍高于全国常模(P<0.05);对照组服用米索前列醇前焦虑、抑郁因子分明显高于首诊(P<0.05),其余因子分无明显变化(P>0.05);研究组的消化道症状、疼痛程度、药物流产时间均低于对照组(P<0.05)。结论:心理干预能明显改善药物流产对妇女心理状态的不良影响,减轻消化道症状、降低疼痛程度,减少流产时间。  相似文献   
6.
Type and prevalence of Axis I and Axis II disorders (DSM-III) were assessed in a sample of 298 consecutive psychiatric outpatients. The instruments used were SCID and SIDP. About half of the Axis I diagnoses consisted of different subgroups of depression. Most patients had more than one diagnosis, anxiety being the second most common disorder. Eighty one percent of the subjects met the criteria for a personality disorder diagnosis; half of them obtained more than one Axis II diagnosis. Personality disorder was more common among men than among women. Avoidant and dependent personality disorders constituted the most frequent diagnoses.  相似文献   
7.
The ventricle-brain ratio (VBR) of 42 chronic schizophrenic patients was compared with that of 42 age-matched medical controls. For the schizophrenics, the relationship of various clinical parameters to the VBR was assessed, and the outcome of 12 weeks of double-blind treatment with either risperidone or haloperidol. The results confirm that schizophrenic patients have slightly enlarged lateral ventricles compared with medical controls. Only for schizophrenics, an effect of age, but not of duration of illness, was noticed. This study does not support the validity of a clinical subdivision of chronic schizophrenic patients on the basis of the VBR. Neither negative, positive nor general psychopathological symptoms, as measured by the Positive and Negative Syndrome Scale for Schizophrenia (PANSS), were related to the VBR, nor were abnormal involuntary movements or extrapyramidal symptoms. No association between season of birth or a family history of major mental disorder and VBR could be demonstrated. Treatment response was predicted by the total PANSS score and the PANSS general psychopathology subscale score at baseline. There was a trend for patients with higher VBR to have a more or haloperidol). or haloperidol).  相似文献   
8.
Two hundred and seventy healthy university students were surveyed in December 1995 using Bond's Defense Style Questionnaire (DSQ) to measure the subjects' defense mechanisms. At the same time, a survey using Byrne's R-S Scale (Repression–Sensitization Scale) of the MMPI (Minnesota multiphasic personality inventory) and five psychiatric symptom indexes (anxiety, sense of inadequacy, sensitivity, depression and impulsive anger) selected from the CMI (Cornell Medical Index-Health Questionnaire) was conducted. Three factors were extracted from the DSQ through factor analysis: immature defenses, neurotic defenses, and mature defenses. The results of analysis of variance revealed the following: (i) for anxiety and anxiety related symptoms, both immature defenses and neurotic defenses indicated principal effect; (ii) for impulsive anger and depression, immature defenses presented principal effect; and (iii) for sensitivity and impulsive anger, interaction between a mature defense style and neurotic defense style was noted. The relationship between defense styles and psychiatric symptoms in healthy people is studied in this paper.  相似文献   
9.
作者根据现代免疫学观点,自1989年起采用自制中药“90增血剂”治疗ITP46例。期间,应用间接免疫荧光技术检测了患者外周血T淋巴细胞亚群,结果表明病例组全T细胞(CD_3)、T辅助/诱导细胞(CD_4)降低,T抑制/细胞毒细胞(CD_8)增高,CD_4/CD_8比值明显降低。治疗后,患者T亚群恢复常态,血小板数上升,骨髓产板型巨核细胞数增加,临床总有效率达91.2%,明显优于激素组(71.4%)。提示中药具有显著的疗效和良好的免疫调节作用。同时,动态观察ITP患者T细胞亚群的变化,对帮助临床判断治疗反应和预后有很大意义。  相似文献   
10.
The Psychosomatic Symptom Checklist (PSC), a questionnaire assessing psychosomatic symptoms, was administered to two separate samples of college students. For Sample 1 (N=698),the questionnaire was readministered to three separate subsets at intervals of either 1 week (N=143),4 weeks (N=74),or 8 weeks (N=48).Each subset of subjects recompleted the PSC on only one of the three retest intervals. Based on the initial administration an analysis of the normative data revealed a mean total score of 23.7, suggesting a relatively low degree of psychosomatic symptoms in this group. Although total scores decreased slightly over time, test-retest correlations remained high (r>0.80, P<0.0001).Individual item correlations varied and also decreased across time; however, the majority of correlations was greater than r=0.50 throughout. Sample 2 (N=249)completed the PSC, Beck Depression Inventory (BDI), State-Trait Anxiety Inventory (STAI-X), and Rathus Assertiveness Scale (RAS), and intercorrelations were computed between these measures. This analysis revealed little overlap between the psychosomatic complaints assessed by the PSC and other commonly used measures of psychological distress. Finally, a factor analysis revealed one major factor on which all but 2 of the 17 questionnaire items loaded significantly. These results suggest that the PSC is sensitive to psychosomatic distress and remains reliable over time.This reaserch was supported in part by Grants NS-15235 and NS-16891 from NINCDS.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号