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   1825篇
  免费   77篇
  国内免费   10篇
耳鼻咽喉   35篇
儿科学   64篇
妇产科学   157篇
基础医学   232篇
口腔科学   10篇
临床医学   192篇
内科学   389篇
皮肤病学   26篇
神经病学   181篇
特种医学   55篇
外科学   332篇
综合类   7篇
预防医学   40篇
眼科学   38篇
药学   49篇
肿瘤学   105篇
  2023年   7篇
  2022年   5篇
  2021年   14篇
  2020年   13篇
  2019年   13篇
  2018年   22篇
  2017年   17篇
  2016年   16篇
  2015年   29篇
  2014年   32篇
  2013年   61篇
  2012年   128篇
  2011年   104篇
  2010年   70篇
  2009年   77篇
  2008年   123篇
  2007年   139篇
  2006年   145篇
  2005年   156篇
  2004年   162篇
  2003年   118篇
  2002年   99篇
  2001年   16篇
  2000年   14篇
  1999年   21篇
  1998年   37篇
  1997年   19篇
  1996年   23篇
  1995年   27篇
  1994年   20篇
  1993年   19篇
  1992年   20篇
  1991年   16篇
  1990年   11篇
  1989年   8篇
  1988年   15篇
  1987年   11篇
  1986年   12篇
  1985年   13篇
  1984年   2篇
  1983年   7篇
  1982年   13篇
  1981年   6篇
  1980年   6篇
  1979年   7篇
  1978年   4篇
  1976年   2篇
  1975年   2篇
  1974年   8篇
  1972年   1篇
排序方式: 共有1912条查询结果,搜索用时 46 毫秒
81.
Since 1980s there is a noticeable change in the homeless population in Western countries. Some researchers titled the change as the "new" homeless that are distinctly different than the "skid row" population described in the past. Among the "new" homeless there are increasing numbers of elderly subjects. The elderly homeless are a fragile and vulnerable group that suffers from high rates of physical and mental problems as well as increased mortality. The aim of the present study was to characterize the "new" elderly homeless. Over a 10-year period each homeless 65 years of age and older was assessed by a psychiatrist. The project was undertaken in Tel-Aviv, Israel, and was feasible due to close co-operation between the Municipal Welfare Department and mental health consultants. The Structured Clinical Interview for DSM-IV (SCID) was the main diagnostic tool. Ninety-eight subjects of 2567 homeless persons located and contacted were elderly (3.8%). Mean age for the elderly sub-group was 71.7+/-5.3 years and the great majority were male 94/98 (95.9%). In 44/98 (44.9%), a formal DSM-IV axis I psychiatric disorder was diagnosed, most common being dementia (15/44) and schizophrenia (15/44). A significant minority of 13/44 (29.5%) were diagnosed and treated prior to becoming homeless. Physical co-morbidity was found in nearly 2/3 subjects. Following intensive case-management by social workers, 35/44 (79.5%) subjects were successfully placed in permanent housing. The main conclusion is that the "new" elderly homeless are typically males suffering from frequent psychiatric morbidity and physical co-morbidity. Intensive case-management succeeded in achieving return to permanent housing in the majority of subjects.  相似文献   
82.
Background: Childhood obesity has been recognized as the new epidemic in developed countries. Caloric restriction with physical activity is the main therapeutic treatment available for these children. We compared two different dietary protocols to assess treatment efficacy. Methods: Obese children from the Pediatric Endocrinology clinic were prospectively recruited for the study. Children and their parents were allowed to choose one of two dietary protocols: (1) carbohydrate restricted diet (<30 g/day), with unlimited calories, protein, and fat (High protein, Low CHO Diet), and (2) calorie restricted diet (Low Cal Diet). Anthropometric data were measured at baseline and at the 2 month follow up appointment. Results: Thirty-seven children completed the study of whom 27 chose High Protein, Low CHO Diet and 10 chose Low Cal diet. No differences in gender ratio, age, or BMI were observed at baseline. At 2 months, children in the High Protein, Low CHO Diet lost an average of 5.21 +/- 3.44 kg (p < 0.001) and decreased their BMI by 2.42 +/- 1.3 points (p < 0.001), compared to the children in the Low Cal Diet who gained an average of 2.36 +/- 2.54 kg and 1.00 point on the BMI value (p < 0.001). Conclusions: A high protein, low carbohydrate, unlimited calorie diet was superior to a restricted calorie protocol for weight loss in obese school age children; moreover, compliance was better.  相似文献   
83.
There is a paucity of data regarding sexuality among nursing home residents. The aim of the present study was to evaluate sexual attitudes in a group of independent residents in a large urban nursing home. Ten items covering different aspects of sexual attitude were scored by two board certified psychiatrists following a semistructured interview. The study was undertaken at a large 1,200-bed nursing home providing services to both healthy independent elderly as well as geriatric patients. Subjects were 31 volunteers: 15 men and 16 women (mean age: 82.4 and 74.1 years, respectively), who consented to participate. Participants were cognitively intact and living independently at the nursing home. Exclusion criteria were: a) current major psychiatric morbidity, b) drug or alcohol abuse, c) Geriatric Depression Scale (short version) score 5, and d) Clinical Dementia Rating >0. A hierarchy of basic functions was constructed wherein each function was graded on a 5-point Likert-like scale reflecting its endorsed importance. The majority (23/31) felt that sexuality should be openly discussed with the elderly by health professionals. Twenty-one of 31 expressed willingness to receive medical consultation and treatment for sexual dysfunction as needed and 20/31 expressed a similar attitude if their partner so needed. The hierarchy of needs was rated by the participants (men and women, respectively) as follows: Mood (4.4; 4.3), Memory (4.2; 4.2), Sleep (3.8; 3.9), Sex (3.5; 2.8), and Appetite (2.8; 2.6). Sex is graded as moderately important among nursing home residents, more so in males. The majority of residents expressed positive attitudes towards open discussion of sexual matters and willingness to accept therapeutic interventions when needed.  相似文献   
84.
The clock drawing test (CDT) is a complex task assessing integrative functions, abstract thinking and visuospatial organization. In the present study we evaluated the CDT as a possible screening instrument for early cognitive impairment in multiple sclerosis (MS) patients. In total, 107 MS patients completed the CDT as well as a battery assessing five cognitive domains. There were 73 female and 34 male participants (mean age 45.4+/-11.6 years, range 19-69). The majority (76/107) were diagnosed with a relapsing-remitting disease course. Mean expanded disability status scale (EDSS) score was 4.3+/-2.4 (range 0-8). The CDT was scored on a 1-6 point scale with "1" being a perfect score and "6" reflecting severe disorganization. Mean CDT score was 2.6+/-1.4. In 53% of patients the CDT was normal while in 11.2% dementia was apparent. The CDT score did not correlate with the total EDSS. Significant correlations were obtained with the mental functional system score of the EDSS (r = 0.78; p = 0.0001), visual learning and recall, sustained attention and concentration. Our findings demonstrate the sensitivity of the CDT to several cognitive domains. The absence of correlation with total EDSS score coupled with significant correlation with the mental functional system suggests that the CDT may be useful for screening MS patients.  相似文献   
85.
OBJECTIVE: To examine trends in suicide rates in Israel over a 13-year period. METHOD: All cases of autopsy-confirmed suicide in Israel from 1985 to 1997 were retrospectively reviewed. RESULTS: An overall annual increase in suicide rates, with rates in men 3 times higher than those in women, was observed. Suicide rates were highest in the second and third decades of life. Unlike Western countries where gunshot wounds are the most common method of suicide for men and poisoning is most common for women, asphyxiation by hanging was the most common method used by men in Israel, followed by firearm wounds and jumping from heights. In women, however, jumping from heights was the most common method, followed by hanging and poisoning. CONCLUSION: Increasing rates of suicide may be associated with waves of immigration to Israel, increased substance abuse and depression and the political and social climate. Further study to examine the precipitating factors is warranted.  相似文献   
86.
Suicide is a major public health problem with advancing age being one of the factors associated with increased risk. It has been suggested that most DSM axis-I disorders contribute to increased suicidal risk while dementia is one of the few exceptions. We conducted a 10-year retrospective analysis of all elderly patients suffering from dementia admitted to a large urban mental health center. Between 1991 and 2000 there were 1,551 admissions to our center who were 65 years or older. Of these, 341 were diagnosed (DSM-IV criteria) as suffering from dementia and 215/341 as suffering from Alzheimer's disease (AD). Sixteen AD patients (7.4% of all AD patients) were admitted immediately following a suicide attempt. The control group consisted of the next admission of an elderly AD patient matched for age and gender. The index group (suicidal patients) differed from controls in Clinical Dementia Rating scores (p = 0.017) and higher frequency of previous suicide attempts (p = 0.022). Lifetime psychopathology was not associated with higher rates of suicide attempts (p = 0.068). Physicians should be aware that suicide attempts are not rare in elderly AD patients. Higher level of daily functioning and previous suicide attempts are associated with increased suicidal risk.  相似文献   
87.
Malignant neoplasms known to develop after external beam radiation include angiosarcoma. Although angiosarcoma developing in a lymphedematous arm after radical mastectomy is a well-known phenomenon, cutaneous angiosarcoma after radiotherapy for breast carcinoma has been rarely documented. Herein we present a case with cutaneous angiosarcoma that developed in a 69-year-old woman's breast 5 years after she underwent conservative treatment to the breast: lumpectomy, axillary lymph node dissection, and radiation therapy to the breast. The possible relation of the angiosarcoma to the initial radiotherapy, early diagnosis, and treatment is discussed.  相似文献   
88.
OBJECTIVE: Weight gain has been reported in younger patients treated with most atypical neuroleptics. The goal of this study was to examine whether elderly schizophrenic patients gain weight while being treated with risperidone. METHOD: Data are from an international multicenter, open-label study of 180 elderly (69 men, 111 women), chronically ill, psychotic patients (meeting DSM-III-R criteria for schizophrenia or schizophreniform disorder; median age = 72 years [range, 54-89 years]), 97 of whom completed the 12-month study. At endpoint, the mean dose of risperidone was 3.7 mg/day. Patients were weighed at baseline and at endpoint. RESULTS: There was no significant weight gain in patients who completed the trial (N = 96) or in those who did not complete the entire trial (N = 31). CONCLUSION: The results suggest that risperidone treatment is not associated with weight gain among elderly persons with chronic psychosis.  相似文献   
89.
A case is described of an experimental physicist who developed parkinsonism, apparently as delayed toxic effect of long exposure to vapors of methanol in the laboratory. Clinical and magnetic resonance imaging (MRI) supported the diagnosis, after exclusion of hereditary diseases and primary degenerative diseases. Screening for heavy metals in urine and plasma ceruloplasmin was negative. This case illustrates the neurotoxic delayed effect of long-term exposure to methanol with no episodes of acute intoxication. The setting of a research laboratory with prolonged exposure to mixed single crystals and inhalation of methanol vapors may exist in other academic and hi-tech environments, and pose the risk of similar delayed toxic influences.  相似文献   
90.
OBJECTIVE: Most of the data supporting the use of atypical antipsychotics (AA) is based on studies in young adult patients. The present study is an open-label naturalistic follow-up study of olanzapine treatment vs. haloperidol for elderly chronic schizophrenia patients. MEHTOD: 20 patients (mean age 72.7+/-5.9 years, mean disease duration 33.1+/-12.0 years) who met the DSM-IV criteria for schizophrenia were randomly assigned to olanzapine (n=10) or haloperidol (n=10) treatment during acute exacerbation. Primary outcome measure was rating on the Clinical Global Impression (CGI) scale and the Positive and Negative Symptom Scale (PANSS). RESULTS: Between-group differences were computed using analysis of covariance. PANSS Total score decreased from 84 at baseline to 65 after treatment with olanzapine while decreased only from 79 to 74 with haloperidol treatment (F= 6.66, P=.02). PANSS Negative subscale decreased from 19 at baseline to 15 with olanzapine treatment while increased (deteriorated) from 18 to 20 with haloperidol treatment (F=23.37, P=.0003). CGI decreased from baseline with both olanzapine and haloperidol treatments (1.1 vs. 0.4) but the decrease in the olanzapine group was significantly greater (F=4.63, P=.05). Mean weight increased in both groups but without statistical difference between groups. CONCLUSIONS: In elderly chronic schizophrenia patients, olanzapine treatment is superior to haloperidol in reducing negative symptoms as well as less induction of extrapyramidal symptoms (EPS).  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