全文获取类型
收费全文 | 82879篇 |
免费 | 4800篇 |
国内免费 | 186篇 |
专业分类
耳鼻咽喉 | 1068篇 |
儿科学 | 3204篇 |
妇产科学 | 1860篇 |
基础医学 | 11332篇 |
口腔科学 | 2330篇 |
临床医学 | 7640篇 |
内科学 | 18211篇 |
皮肤病学 | 1973篇 |
神经病学 | 7260篇 |
特种医学 | 2530篇 |
外国民族医学 | 33篇 |
外科学 | 11683篇 |
综合类 | 272篇 |
一般理论 | 23篇 |
预防医学 | 5727篇 |
眼科学 | 1907篇 |
药学 | 5435篇 |
中国医学 | 249篇 |
肿瘤学 | 5128篇 |
出版年
2023年 | 526篇 |
2022年 | 437篇 |
2021年 | 1377篇 |
2020年 | 897篇 |
2019年 | 1488篇 |
2018年 | 2400篇 |
2017年 | 1694篇 |
2016年 | 1790篇 |
2015年 | 1965篇 |
2014年 | 2309篇 |
2013年 | 3579篇 |
2012年 | 5623篇 |
2011年 | 5987篇 |
2010年 | 3145篇 |
2009年 | 2427篇 |
2008年 | 5252篇 |
2007年 | 5529篇 |
2006年 | 5302篇 |
2005年 | 5428篇 |
2004年 | 5195篇 |
2003年 | 4792篇 |
2002年 | 4619篇 |
2001年 | 2002篇 |
2000年 | 2147篇 |
1999年 | 1610篇 |
1998年 | 623篇 |
1997年 | 497篇 |
1996年 | 429篇 |
1995年 | 386篇 |
1994年 | 333篇 |
1993年 | 297篇 |
1992年 | 704篇 |
1991年 | 617篇 |
1990年 | 608篇 |
1989年 | 564篇 |
1988年 | 505篇 |
1987年 | 483篇 |
1986年 | 458篇 |
1985年 | 401篇 |
1984年 | 323篇 |
1983年 | 270篇 |
1982年 | 183篇 |
1979年 | 237篇 |
1978年 | 159篇 |
1977年 | 157篇 |
1974年 | 170篇 |
1973年 | 160篇 |
1972年 | 147篇 |
1971年 | 154篇 |
1969年 | 158篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
81.
82.
Rakel Kling Marc Corbière Rebecca Milord Janet G Morrison Kevin Craib Annalee Yassi Claire Sidebottom Catherine Kidd Victoria Long Sharon Saunders 《AAOHN journal》2006,54(11):481-487
This study examined the use and effectiveness of the Alert assessment form. The form is part of the Alert system, used by one large acute care hospital to identify patients with a propensity for violence. All reported incidents of patient violence from August 1, 2003, through December 31, 2004, were included in patient charts. One hundred seventeen violent patient charts were reviewed and compared with 161 non-violent patient charts, randomly chosen from the same time period. Overall use of the Alert assessment form for violent and non-violent patients was 75.7% and 35.4%, respectively. The assessment form was found to have moderate sensitivity (71%) and high specificity (94%). It is reasonably effective in identifying potentially violent or aggressive patients when it is used according to protocol. Efforts to improve the tool are warranted, as is evaluation of its benefit in settings with low prevalence of violence. Also, greater effort must be taken to prevent violence once an aggressive patient has been identified. 相似文献
83.
84.
85.
86.
Physician based surveillance system for occupational respiratory diseases: the experience of PROPULSE, Québec, Canada. 总被引:1,自引:0,他引:1
下载免费PDF全文
![点击此处可从《Occupational and environmental medicine》网站下载免费的PDF全文](/ch/ext_images/free.gif)
OBJECTIVE: To evaluate the feasibility of implementing a physician based surveillance system of occupational respiratory diseases (PROPULSE) in Québec with regard to physician participation rate, characteristics of reported cases, and comparison with official statistics from the Workers' Compensation Board (WCB). METHODS: All chest physicians and allergists in Québec were asked to report suspected new cases of occupational respiratory diseases, on a monthly basis, between October 1992 and September 1993. For each case, personal information was collected and the physician's opinion on whether the condition was related to work was categorised as highly likely, likely, and unlikely. RESULTS: Of the 161 physicians initially approached, 68% participated. Physicians rated 48% of suspected cases as highly likely, 29% as likely, and 20% as unlikely. The most often reported diagnosis was asthma (63%), followed by diseases related to asbestos (16%). Silicosis was less frequent (5%) but it was reported for six workers under 40 of whom five were involved in sandblasting activities. The high proportion of cases of asthma probably reflects the increasing importance of this disease but may also reflect the different patterns of reporting among physicians with different expertise. The distribution of cases by diagnostic category is quite different between the PROPULSE system and that of the WCB (annual mean number of compensated cases during a four year period). Asthma and allergic alveolitis are more frequent in PROPULSE, reactive airways dysfunction syndrome are about the same in both systems, and other diseases are more frequent among compensated cases. The most frequent sensitising agents reported for asthma were the same in both systems (isocyanates, flour, and wood dust). 15% of the PROPULSE cases were not covered by the WCB, and therefore would not be found in the board's official statistics. CONCLUSIONS: A physician based reporting procedure can be implemented as part of a surveillance system to supplement data from other sources and thus provide a better understanding of the occurrence of occupational respiratory diseases. 相似文献
87.
The geographic distribution of multiple sclerosis within the 95 Départements and the 21 Régions of France was defined from a 1986 nationwide prevalence series derived from questionnaires. This indicated a significant clustering of high frequency regions in the northeastern part of the country with most significantly low areas in the south and west. Distributions were similar to those for MS death rates by Département and Région for 1968–1977, indicating geographic stability over time; but there was also evidence of diffusion over time. The 1986 prevalence distribution was also compared with all published prevalence rates for communities of France. From all these resources we conclude that all of France falls within the "high frequency zone" for MS, that the nationwide prevalence rate is at least 50 per 100000 population, and that there is evidence of geographic clustering of the disease with temporal spread of the cluster. 相似文献
88.
G. Lallement Didier Clarençon Catherine Masqueliez Dominique Baubichon Monique Galonnier Marie-France Burckhart Michel Peoc’h Jean Claude Mestries 《Archives of toxicology》1997,72(2):84-92
Organophosphorus nerve agents are still in use today in warfare and as terrorism compounds. Classical emergency treatment
of organophosphate poisoning includes the combined administration of a cholinesterase reactivator (an oxime), a muscarinic
cholinergic receptor antagonist (atropine) and a benzodiazepine anticonvulsant (diazepam). However, recent experiments with
primates have demonstrated that such treatment, even when administered immediately after organophosphate exposure, does not
rapidly restore normal electroencephalographic (EEG) activity and fails to totally prevent neuronal brain damage. The objective
of this study was to evaluate, in a realistic setting, the therapeutic benefit of administration of GK-11 (gacyclidine), an
antiglutamatergic compound, as a complement to the available emergency therapy against organophosphate poisoning. GK-11 was
injected at a dose of 0.1 mg/kg (i.v) after a 45-min latency period to heavily intoxicated (8 LD50) primates. Just after intoxication, man-equivalent doses of one autoinjector containing atropine/pralidoxime/diazepam were
administered. The effects of GK-11 were examined on survival, EEG activity, signs of toxicity, recovery after challenge and
central nervous system histology. The present data demonstrate that treatment with GK-11 prevents the mortality observed after
early administration of classical emergency medication alone. EEG recordings and clinical observations also revealed that
GK-11 prevented soman-induced seizures and motor convulsions. EEG analysis within the classical frequency bands (beta, theta,
alpha, delta) demonstrated that central activity was totally restored to normal after GK-11 treatment, but remained profoundly
altered in animals receiving atropine/pralidoxime/diazepam alone. GK-11 also markedly accelerated clinical recovery of soman-challenged
primates. Lastly, this drug totally prevented the neuropathology observed 3 weeks after soman exposure in animals treated
with classical emergency treatment alone. GK-11 represents a promising adjuvant therapy to the currently available emergency
polymedication to ensure optimal management of organophosphate poisoning in man. This drug is presently being evaluated in
a human clinical trial for a different neuroprotective indication.
Received: 16 June 1997 / Accepted: 23 September 1997 相似文献
89.
Gallstone shock wave therapy at the University Hospital of Zurich is a joint venture between the Medical Clinic, Medical Policlinic and Surgical Clinic. Patients with symptomatic cholecystolithiasis willing to submit themselves to a long period of treatment, were accepted for ESWL, should no contraindications be present. From October 1988 through May 1989 we treated 48 patients. In approximately two thirds of our patients we were successful with one ESWL alone, in one third 2 sessions and in two patients even 3 sessions were needed. In 42 patients course after therapy was as planned. Six had to be cholecystectomized later on. Best results were achieved in patients with single gallstones. In 2 of 5 cases there was disagreement between the number of gallstones found sonographically and the intraoperative findings. Histologic examination of gallbladders after ESWL showed no pathologic changes. 相似文献
90.