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   1819篇
  免费   63篇
  国内免费   1篇
耳鼻咽喉   20篇
儿科学   60篇
妇产科学   80篇
基础医学   182篇
口腔科学   17篇
临床医学   189篇
内科学   425篇
皮肤病学   39篇
神经病学   76篇
特种医学   38篇
外科学   262篇
综合类   144篇
一般理论   3篇
预防医学   160篇
眼科学   20篇
药学   138篇
肿瘤学   30篇
  2013年   13篇
  2011年   7篇
  2010年   19篇
  2009年   22篇
  2008年   12篇
  2006年   9篇
  2002年   7篇
  1999年   10篇
  1998年   14篇
  1997年   28篇
  1996年   37篇
  1995年   27篇
  1994年   29篇
  1993年   27篇
  1992年   25篇
  1991年   18篇
  1990年   18篇
  1989年   32篇
  1988年   24篇
  1987年   20篇
  1986年   31篇
  1985年   23篇
  1984年   16篇
  1983年   20篇
  1982年   13篇
  1981年   21篇
  1980年   13篇
  1979年   15篇
  1978年   12篇
  1977年   8篇
  1976年   18篇
  1975年   10篇
  1974年   8篇
  1971年   7篇
  1968年   13篇
  1965年   11篇
  1963年   30篇
  1962年   6篇
  1961年   11篇
  1960年   9篇
  1959年   111篇
  1958年   181篇
  1957年   171篇
  1956年   173篇
  1955年   155篇
  1954年   132篇
  1949年   66篇
  1948年   105篇
  1947年   10篇
  1946年   8篇
排序方式: 共有1883条查询结果,搜索用时 0 毫秒
141.
1) A familial hemorrhagic diathesis has been found to be due to an antithrombin.

2) This antithrombin is not fibrinogen, antithrombin II, III, or IV, and isnot similar in its characteristics to the antithrombins described in secondaryhemorrhagic conditions.

3) The inheritance of this disorder is not sex-linked but is otherwise notclear. The factor may be a dominant, the expression of which is modified byunknown factors.

Submitted on July 6, 1962 Accepted on October 17, 1962  相似文献   
142.
143.
144.
145.
146.
This paper is not intended as a treatise on cerebro-spinal meningitis, but is a simple. report on an epidemic which brought to our hospital: in the course of three months, an intereshng series of forty three cases. During some I2 years in south Hunan, we had seen less than ten cases of cerebro-spinal meningitis, of the meningococcus type, prior fo the epidemic in the Spring of 1934. Previous cases were always sporadic, since, even when we received three cases in one day from a certain government school, there was never any further outbreak. Tuberculous and pneumococcic meningitis (and possible leprous meningitis) have been met with, but have no place in this report.  相似文献   
147.
148.
149.
The large intestine extracts water from chyme and compacts chyme into faecal conglomerates; it is unclear what role the special pockets known as colonic haustra have in these events. Here we monitored the movements of haustra in isolated preparations of guinea pig caecum using videocamera and ultrasound and related them to contractions of muscle flaps and movements of glass beads in haustral pockets. We found that in partially filled caecal loops localized contractions of taeniae shift volume back and forth between adjacent haustra; volume unfolds haustral walls in a characteristic sweep with sequential intrahaustral folds popping out; cyclic contractions and relaxations of the fold then produce the caterpillar-like movement known as haustral rolling; ultrasound showed that haustral rolling made the haustral flow channel narrower and longer as haustral folds increase their height from 7.5 ± 1.5 mm to 16 ± 4 mm and their distance from 4.1 ± 0.2 mm to 7.9 ± 0.3 mm; luminal contents were alternatively shaken off the haustral wall, whirled around the lumen or left to settle. We also suspended the row of haustra between two taeniae inside a frame and attached flaps of taeniae and haustral folds to strain gauges to record their mechanical activity; both taeniae and haustral folds produced an undulating baseline tension; during rolling, folds produced phasic contractions at 17 ± 2 cycles min?1 which propagated distally across haustral septa; rolling constantly shuffled around glass beads placed inside the haustra. When we stimulated the intramural nerves to the caecum through bipolar electrodes, all contractile activity was temporarily inhibited and haustral septa flattened; a rebound contraction then propagated aborally from the caecal pole and swept the glass beads ahead of it. Thus, tonic contractions of taeniae shift caecal contents back and forth across haustral septa; expansion of haustra triggers haustral rolling which shuffles contents; both these movements produce local flow within and between haustra which might enhance the separation of solid and liquid colonic contents.  相似文献   
150.
Crush syndrome     
Objective: To describe the clinical features of crush syndrome, the inter-relationship between rhabdomyolysis, compartment syndrome and crush syndrome, and to make recommendations on the pre-hospital and emergency department management of the condition. Clinical features: Three case reports are described of patients presenting with crush syndrome following drug induced coma, including one patient in cardiac arrest. Raised compartment pressures were confirmed by manometry, and extensive rhabdomyolysis by myoglobinuria and raised creatine kinase. Intervention and outcome: Vigorous medical management was undertaken including infusion of large volumes of intravenous fluid, and therapy with bicarbonate; mannitol, frusemide and dopamine. Surgical fasciotomy was not performed and a good outcome resulted in each case. Conclusion: Drug induced coma is now the commonest cause of the crush syndrome. Effective medical management may obviate the need for surgical fasciotomy in cases with raised compartment pressures.  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