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   887篇
  免费   45篇
耳鼻咽喉   20篇
儿科学   43篇
妇产科学   6篇
基础医学   127篇
口腔科学   16篇
临床医学   53篇
内科学   156篇
皮肤病学   5篇
神经病学   62篇
特种医学   31篇
外科学   102篇
综合类   18篇
预防医学   72篇
眼科学   10篇
药学   114篇
中国医学   5篇
肿瘤学   92篇
  2023年   7篇
  2022年   14篇
  2021年   27篇
  2020年   14篇
  2019年   19篇
  2018年   18篇
  2017年   18篇
  2016年   21篇
  2015年   30篇
  2014年   27篇
  2013年   42篇
  2012年   79篇
  2011年   60篇
  2010年   31篇
  2009年   21篇
  2008年   40篇
  2007年   33篇
  2006年   40篇
  2005年   28篇
  2004年   21篇
  2003年   23篇
  2002年   18篇
  2001年   16篇
  2000年   18篇
  1999年   8篇
  1998年   5篇
  1997年   7篇
  1996年   7篇
  1994年   5篇
  1993年   7篇
  1992年   16篇
  1991年   10篇
  1990年   19篇
  1989年   24篇
  1988年   23篇
  1987年   19篇
  1986年   14篇
  1985年   10篇
  1984年   6篇
  1981年   7篇
  1980年   5篇
  1979年   7篇
  1978年   5篇
  1977年   5篇
  1976年   5篇
  1974年   6篇
  1973年   6篇
  1972年   5篇
  1971年   4篇
  1969年   4篇
排序方式: 共有932条查询结果,搜索用时 15 毫秒
1.
Frequency of sickle cell in Scheduled Caste and Scheduled Tribe populations was found to be 1.5 and 14.9% respectively, whereas G-6-PD deficiency was 5.9 and 4.2% respectively. Blood group B was dominant in both the communities. A significantly lower frequency of P. falciparum malaria was observed among sicklers.  相似文献   
2.
3.
The effect of Prunus amygdalus, which is rich in unsaturated fat, fibre diet and low cholesterol was studied in 36 normolipidemic male albino rabbits for 60 days. Three different doses i.e. whole seeds defatted and oil showed a decrease in serum total cholesterol, triglyceride, LDL cholesterol, VLDL cholesterol and an increase in phospholipid, faecal sterol and HDL cholesterol. The maximum effects where shown by whole seeds followed by oil and defatted.  相似文献   
4.
This study was undertaken to examine the efficacy of lidocaine aerosol pretreatment in attenuating hemodynamic (HD) responses secondary to laryngoscopy and tracheal intubation in patients undergoing surgery for intracranial space occupying lesions (ICSOL). A semiclosed breathing system was improvised to generate aerosol of consistent density. Five percent lidocaine was nebulized in two different dosages (0.2 and 0.1 ml/kg in groups A and B, respectively); group C (control) received aerosol of normal saline. The average aerosol-treatment time was 24, 12, and 16 min in groups A, B, and C, respectively. Changes in heart rate (HR), systolic arterial pressure (SAP), diastolic arterial pressure (DAP), and rate pressure product (RPP) were analyzed by analysis of variance (ANOVA). In group A, tracheal intubation did not cause significant HD changes. In group B, a significant increase was observed in each HD parameter which, when compared with control, was less severe. Lidocaine toxicity, regurgitation, nausea, vomiting, or aspiration did not occur in any patient. Patients accepted the procedure well. This study found efficacy of the technique to be related to duration of aerosol treatment.  相似文献   
5.
The Authors report a case of rupture of the diaphragm in blunt trauma of the abdomen, to examine the more significant features of this condition whose incidence proves to be increasing, after a review of the literature data, parallel to the increase of accidents on the road and at work. They examine the most important pathogenic problems and these related to the mechanism leading to diaphragmatic lesion and they highlight the deeper pathophysiological changes suffered from the patient with such a condition. They draw attention to what they consider to be the most important aspect, and therefore the diagnosis. In fact, in accordance with the various series of cases reported in the literature, it is crucial in the diagnostic problem is when the possible cause of the rupture is suspected and necessary diagnostic cascade (Rx, echotomography, TC) is activated so to highlight the lesion. Therefore a quick diagnostic fitting is necessary for the survival of the acute patient with hernia of the thorax cavity, as well as quick surgical correction of the lesion that, as in the case described, serves to achieve the best possible anatomic-functional results.  相似文献   
6.
Nonunion of fractures of the olecranon fossa of the humerus presents a difficult surgical problem. The distal fragment is usually small and osteoporotic and stable fixation is not easy to achieve. We describe a modification of the technique of locked nailing by which the distal aspect of the nail is placed in the subchondral region of the trochlea. Good results were obtained in seven out of eight patients with this technique.  相似文献   
7.
The concentration of chlorinated pesticides and heavy metals (lead and cadmium) was measured using gas liquid chromatography and the graphite tube atomizer of atomic absorption spectrophotometer, respectively, in semen samples collected from men in the normal human population. Significant concentrations of lead and cadmium were detected. Significant amounts of hexachlorocyclohexane (HCH) and its isomers alpha, beta, gamma and delta, the dichlorodiphenyl trichloroethane (DDT) metabolite 1,1,1-trichloro-2,2-bis (p chlorophenyl ethane) (pp'-DDE) and low values of 1,1,2-dichloro-2, 2-bis(p chlorophenyl ethane) (pp'-DDD) aldrin or endosulfan were detected. The presence of these xenobiotics in human semen might be related to the extensive use of pesticides, emission of exhaust from motor vehicles, consumption of tobacco and industrial operations.  相似文献   
8.
One of the most potent rodenticides is 2-fluoroacetamide)2-FA).Toxicity of this chemical is well documented.However,its inhalation toxicity data is not available in the literature.Hence,acute inhalation toxicity study was carried out by exposing male and female rats to aerosols of 2-FA at different concentrations for 4h in a dynamically operated whole body inhalation exposure chamber.During and after the inhalation exposure the rats were less active,and showed mild tremors and convulsions.At higher concentrations the rats died after2-3 days.The estimated 4-h LC50 for male and female rats was 136.6 and 144.5mg.m^-3 respectively.Exposure to 0.7 LC50 for 4h duration showed an increase in the liver weight of male and female rats 7 days after exposure.Various haematological and biochemical variables determined were within the normal limits.Howerver,histological findings showed injured lung as indicated by desquamtion and necrosis of the epithelium of the respiratory tract.Marked hypertorphy of hepatocytes displaying strong acidophilic granulated cytoplasm was observed.Focal dilatation of renal proximal tubules in kidney with cytoplasmic vacuolation,and irregularly placed pyknotic nuclei were seen.The present study shows that 2-FA is a highly toxic chemical through the inhalation route based on the LC50 value.Consequently necessary precautions should be taken during its handling.  相似文献   
9.
The role of endoscopic treatment of cholestasis is well codified as an alternative or adjuvant therapy to surgery, particularly in those cases where non malignant cause has been identified. Non-neoplastic cholestasis therefore benefits very substantially from endoscopic treatment in a context where the traditional surgical approach presents limitations in terms of morbidity and mortality. It should be borne in mind, however, that the two approaches are strictly complementary for the correct management of these patients.  相似文献   
10.
Based on personal observation of a case of recurrent chordoma in the sacrococcygeal region four years after the first excision with subtotal resection of the coccyx using a posterior approach, the authors describe the unique characteristics of this rare neoplasm and underline the simplicity of this method of treatment. The surgical technique used to treat the recurrent form also used a posterior approach, with complete resection of the neoplasm including the scar of the previous operation and the last remaining segment of the coccyx. No intra- or postoperative complications were reported. The authors examine the clinical and histological aspects of this neoplasm, concluding that the correct form of treatment must aim both to protect the adjacent anatomic structures and to achieve radical exeresis, as well as achieving a simpler surgical approach unhampered by complications. The authors believe that this approach is simpler than the abdominal-dorsal approach, although this is necessary in the event of intra-abdominal infiltrations.  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