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   722篇
  免费   47篇
耳鼻咽喉   7篇
儿科学   19篇
妇产科学   146篇
基础医学   91篇
口腔科学   17篇
临床医学   55篇
内科学   84篇
皮肤病学   8篇
神经病学   86篇
特种医学   39篇
外科学   101篇
综合类   4篇
预防医学   44篇
眼科学   15篇
药学   15篇
肿瘤学   38篇
  2023年   2篇
  2022年   6篇
  2021年   12篇
  2020年   7篇
  2019年   13篇
  2018年   22篇
  2017年   10篇
  2016年   13篇
  2015年   15篇
  2014年   15篇
  2013年   33篇
  2012年   31篇
  2011年   43篇
  2010年   25篇
  2009年   18篇
  2008年   41篇
  2007年   33篇
  2006年   38篇
  2005年   30篇
  2004年   34篇
  2003年   28篇
  2002年   24篇
  2001年   14篇
  2000年   21篇
  1999年   11篇
  1998年   6篇
  1997年   9篇
  1996年   12篇
  1995年   8篇
  1994年   6篇
  1993年   7篇
  1992年   30篇
  1991年   21篇
  1990年   28篇
  1989年   21篇
  1988年   11篇
  1987年   6篇
  1986年   10篇
  1985年   5篇
  1984年   6篇
  1983年   7篇
  1982年   4篇
  1980年   2篇
  1979年   8篇
  1977年   4篇
  1976年   3篇
  1973年   2篇
  1972年   2篇
  1971年   2篇
  1969年   3篇
排序方式: 共有769条查询结果,搜索用时 15 毫秒
1.
This research was conducted at a summer camp for siblings of children with cancer. The camp is designed to address emotional problems, provide peer interaction and validation, and bolster siblings' self-esteem. Standardized measures assessing posttraumatic stress, anxiety, quality of life, and self-esteem were administered to 77 siblings (ages 6-17) prior to attending camp and again 3 months after camp. From pre- to post-camp, the siblings reported statistically significant decreases in symptoms of posttraumatic stress and anxiety, and statistically significant improvements in quality of life and self-esteem. These preliminary findings are encouraging and suggest the value of camp as a psychological intervention and provide a model for other pediatric cancer facilities designing intervention programs for siblings.  相似文献   
2.
Measurements of integral membrane protein lateral mobility and rotational mobility have been separately used to investigate dynamic protein--protein and protein-lipid interactions that underlie plasma membrane structure and function. In model bilayer membranes, the mobilities of reconstituted proteins depend on the size of the diffusing molecule and the viscosity of the lipid bilayer. There are no direct tests, however, of the relationship between mechanisms that control protein lateral mobility and rotational mobility in intact biological membranes. We have measured the lateral and rotational mobility of band 3 in spectrin-deficient red blood cells from patients with hereditary spherocytosis and hereditary pyropoikilocytosis. Our data suggest that band 3 lateral mobility is regulated by the spectrin content of the red cell membrane. In contrast, band 3 rotational mobility is unaffected by changes in spectrin content. Band 3 lateral mobility and rotational mobility must therefore be controlled by different molecular mechanisms.  相似文献   
3.
A survey of hospital emergency rooms in Los Angeles County was conducted in March 1987. Analysis of the distribution of uninsured emergency care patients revealed that private hospitals play a significant frontline role in terms of entry into the hospital system for patients who are unable to pay--almost one-half of such patients were treated in the emergency rooms of private hospitals. Hospitals serving markets in which a higher proportion of residents had incomes below the poverty level provided a greater share of uncompensated emergency room services.  相似文献   
4.
We have previously demonstrated that in pentylenetetrazole (PTZ)-kindled rats, cysteamine causes prolonged depression of the kindled state. We now report that administration of cysteamine before or during the kindling process prevents attainment of the kindled state. This effect lasts long after cysteamine administration has ceased, suggesting that depletion or somatostatin may not be the only mechanism underlying cysteamine's effect on kindling. The results also support the likelihood that PTZ kindling primarily effects neocortical rather than limbic structures.  相似文献   
5.
Multiple myeloma was diagnosed in 3 patients following episodes of pneumococcaemia associated with neutropenia and decreased serum concentration of normal immunoglobulins. Severe pneumococcal infection is commonly encountered during the course of multiple myeloma, but has not been stressed as a presenting feature of the disease.  相似文献   
6.
DNA synthesis and release was studied in unstimulated splenocytes of strains of mice known to develop spontaneous systemic lupus erythematosus (SLE)-like disease and in non-SLE age- and sex-matched strains as well. Newly synthesized DNA was measured as total acid-insoluble radioactive material present in cell pellet plus supernatant of unstimulated 0–72 h cell cultures [3H]thymidine-pulsed, whereas DNA release was measured as amount of acid-precipitable radioactivity found in supernatant of those cultures. In all strains known to develop spontaneous murine SLE the amount of newly synthesized DNA was 1.3–2.1-fold increased when compared to normal strains studied concomitantly. Furthermore, a significant increase in DNA release into medium, unrelated to cell viability, was observed in those strains as well. These observations clearly demonstrate different metabolic rates of synthesis and release of DNA in murine SLE. This difference suggests the existance of an underlying mechanism responsible for extracellular DNA abundancy, which may be important for the formation of circulating DNA-anti-DNA immune complexes.  相似文献   
7.
PROBLEM: To examine the relationship between the concentration of uterine fluid human decidua-associated protein (hDP) 200, identified as a monoclonal rheumatoid factor, and different phases of the menstrual cycle. METHODS: Sequential measurements of hDP 200 concentration in uterine fluid were performed in 11 normal ovulatory women, aged 22–36 years. The samples were collected in early proliferative phase, late proliferative phase, periovulatory period, early secretory phase, and late secretory phase. RESULTS: Consistent fluctuations of hDP 200 levels in uterine fluid were found throughout the menstrual cycle. High levels were found during early proliferative phase and periovulatory period related to significantly lower levels during late proliferative and early luteal phases. CONCLUSION: There is menstrual phase dependent variation in the uterine fluid levels of hDP 200.  相似文献   
8.
Background: The treatment of Pseudomonas keratitis has many limitations, and further investigation to identify more effective approaches is required. We therefore studied the possible contribution of the debridement effect of 193-nm excimer laser on Pseudomonas keratitis in rabbit eyes. Methods: Pseudomonas keratitis was induced in 30 rabbit eyes by inflicting controlled central corneal scratches and applying a drop of Pseudomonas aeruginosa suspension. After 24 h, one cornea of each animal was photo-ablated (excimer laser: fluency 90 mJ/cm2, 10 Hz, 213 pulses), yielding 50 m of tissue ablation, while the follow cornea served as control. Five groups of six animals each were formed and received: a subconjunctival injection of gentamicin 20, mg (group 1), topical 14 mg/ml gentamicin hourly (group 2) or every 2.5 h (group 3), or NaCl 0.9% hourly (group 4) for 8 h. In group 5, animals were sacrificed without additional treatment. After 9 h corneas were excised, homogenized, serially diluted, and plated on agar blood plates. The numbers of colony-forming units (CFU) per cornea were statistically evaluated (Mann-Whitney test). Results: In control eyes, a greater decrease of CFU was observed in group 2 than in group 3 (P = 0.03). In laser-ablated eyes, there was no difference in CFU between groups 2 and 3. Comparison of the excimer-treated and control eyes revealed a greater number of bacteria (CFU) in controls only in group 3 (P=0.02). Conclusion: Our study suggests that controlled debridement of cornea with excimer laser may improve the effect of topical antibiotics.Presented at ECORA First Annual Meeting, 5 October 1993, Bonn, Germany  相似文献   
9.
Background. Family-based approaches using the parents as agents of change to treat childhood obesity are superior to programs targeting only children in achieving weight reduction and have a lower dropout rate.Objective. The aim of this study was to compare the impact of two behavioral approaches (parents only vs children only) for the treatment of childhood obesity on parental weight, eating, and activity habits as well as cardiovascular risk factors.Design. A randomized 1-year clinical intervention study was performed.Methods. Sixty obese children (≥20% over ideal weight for age, height, and sex), ages 6–11 years, were randomly allocated to the experimental (parents as sole agents of change) or conventional groups (children as sole agents of change). Fourteen (1-h-long) support/educational sessions were conducted by a clinical dietitian for the parents in the experimental group and 30 sessions for children in the conventional group. Anthropometric and biochemical measurements were determined at the start and end of the program.Results. The experimental approach, when compared to the conventional intervention, was found to be superior in the reduction of fathers overweight (P < 0.05). The former approach resulted also in improved profile of risk factors for cardiovascular disease in both parents. These changes could be ascribed to a greater improvement in eating and activity behaviors observed in parents belonging to the experimental intervention group who participated in a family-based intervention to treat their children's obesity.Conclusions. Treatment of childhood obesity targeting the parents as the sole agent of change, which is more effective for the treatment of childhood obesity when compared to a children-oriented program, may in addition award parents with the benefit of changing their own eating and activity patterns, thus making this program ideal for treatment of obesity in children and their overweight parents.  相似文献   
10.
The home environment is undoubtedly the most important setting in relation to shaping children's eating and physical activity behaviors. Family-based behavioral treatment is the most well-established intervention for the treatment of childhood obesity. Historically, family based interventions target the obese child and at least one or both parents. Presented here is a review of the literature on parents as exclusive agents of change, with the addition of some recent results indicating the effectiveness of this approach when implemented in public health programs. Targeting parents as the exclusive mediator has resulted in a better reduction in children's percentage overweight, and improvement in the obesogenic environment and behaviors, in comparison to a setting in which parents attended sessions with the obese child, or only children attended sessions. The findings from these studies were subsequently implemented in a national community-based survey. Both children's and parents' weight status were significantly improved, although only parents attended the group sessions. A significant reduction in the obesogenic load at home was also found. Permissive parenting style was associated with less reduction in obesogenic load at home (p < 0.01) and with less weight loss (p < 0.05). Omitting the obese child from direct intervention and targeting parents only is a cost-effective approach with integrated messages for the management of weight-related problems.  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