全文获取类型
收费全文 | 11202篇 |
免费 | 773篇 |
国内免费 | 79篇 |
专业分类
耳鼻咽喉 | 98篇 |
儿科学 | 166篇 |
妇产科学 | 144篇 |
基础医学 | 1770篇 |
口腔科学 | 210篇 |
临床医学 | 1029篇 |
内科学 | 2430篇 |
皮肤病学 | 188篇 |
神经病学 | 1098篇 |
特种医学 | 446篇 |
外科学 | 1698篇 |
综合类 | 131篇 |
现状与发展 | 1篇 |
一般理论 | 5篇 |
预防医学 | 641篇 |
眼科学 | 317篇 |
药学 | 858篇 |
中国医学 | 25篇 |
肿瘤学 | 799篇 |
出版年
2023年 | 81篇 |
2022年 | 274篇 |
2021年 | 459篇 |
2020年 | 226篇 |
2019年 | 249篇 |
2018年 | 352篇 |
2017年 | 228篇 |
2016年 | 277篇 |
2015年 | 353篇 |
2014年 | 435篇 |
2013年 | 546篇 |
2012年 | 816篇 |
2011年 | 908篇 |
2010年 | 474篇 |
2009年 | 451篇 |
2008年 | 710篇 |
2007年 | 697篇 |
2006年 | 649篇 |
2005年 | 653篇 |
2004年 | 564篇 |
2003年 | 532篇 |
2002年 | 489篇 |
2001年 | 83篇 |
2000年 | 61篇 |
1999年 | 80篇 |
1998年 | 98篇 |
1997年 | 89篇 |
1996年 | 62篇 |
1995年 | 61篇 |
1994年 | 66篇 |
1993年 | 55篇 |
1992年 | 45篇 |
1991年 | 50篇 |
1990年 | 47篇 |
1989年 | 43篇 |
1988年 | 44篇 |
1987年 | 30篇 |
1986年 | 35篇 |
1985年 | 28篇 |
1984年 | 36篇 |
1983年 | 38篇 |
1982年 | 48篇 |
1981年 | 45篇 |
1980年 | 50篇 |
1979年 | 37篇 |
1978年 | 33篇 |
1977年 | 33篇 |
1976年 | 32篇 |
1975年 | 27篇 |
1974年 | 27篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
12.
Dr. Lutz Lindemann-Sperfeld Klaus-Dieter Rudolf Michael Steen Ivan Marintschev Wieland Otto 《Trauma und Berufskrankheit》2003,5(2):198-207
Complex injuries of the foot are often overlooked, especially in the multiple injured patient, and they then lead to major loss of function. When the mechanism of injury suggests involvement of the foot, a clinical examination of the lower extremities should be included in the primary diagnostic procedures implemented in the multiply injured patient, followed by radiological examination once the patient's condition is stable. The condition of the soft tissues is of decisive importance in the prognosis of complex foot injuries, regardless of whether the damage to the foot is one component of a polytrauma or an isolated injury, which can also be life threatening. The diagnostic examinations selected should be adapted to the severity of the injuries in the particular multiply injured patient. Successful therapy involves stable internal fixation of injuries to bones and joints, though the external fixation options should be considered in the first instance, and carefully selected methods of temporary and definitive soft tissue reconstruction. The aim of treatment is the best possible reconstruction of the foot as a functional weight-bearing unit with intact soft tissue cover and a natural form. Good results can be achieved when there is close interdisciplinary cooperation between trauma (orthopedic) and plastic surgeons. Patient with severe injuries of this kind should be transferred to a trauma center as the first step toward this end. 相似文献
13.
14.
Brian F Perry Ivan S Login Stilianos E Kountakis 《Otolaryngology--head and neck surgery》2004,130(4):449-452
OBJECTIVE: Our goal was to determine the etiology of headache in patients who were referred for sinus evaluation but were found to have no evidence of rhinosinusitis on computed tomography (CT) of the sinuses and on endoscopic examination. METHODS: Data were collected prospectively from 100 patients with headache but with normal sinus CT and endoscopic examination. Headache and 20-Item Sino-Nasal Outcomes Test (SNOT-20) scores of patients with the chief complaint of headache and who requested further neurologic evaluation (group I) were compared with the scores of patients who did not list headache as a significant symptom (group II) and with the scores of patients without headache (group III). RESULTS: The most common neurologic diagnosis for group I patients (n = 36) was migraine headaches (58%). These patients also had higher mean SNOT-20 scores (24 +/- 3.3) compared to group II patients with mild headache (14.6 +/- 2.3) or group III patients without headache (12.4 +/- 2.1). CONCLUSION: Migraine was the most common type of headache in patients with normal sinus CT treated for presumed rhinosinusitis as the cause of the headache. Patients with headache as their chief complaint that required further neurologic evaluation had overall higher SNOT-20 scores than nonheadache patients, indicating greater disability of their overall quality of life index. 相似文献
15.
We investigaed changes in the anterior tibial muscle during lengthening of the lower leg in rabbits. In 37 rabbits, an osteotomy of the right middle tibia was performed and was fixed by a unilateral external fixator. The rabbits were randomized into 6 groups. In groups 1, 2, and 3 the tibiae were distracted 0.5 mm/day. In groups 1 and 2, the rabbits were killed after 14 and 28 days of distraction, respectively, and in group 3 after 28 days of distraction, followed by 14 days of rest. Groups 1a, 2a, and 3a served as controls. They were treated similarly as groups 1, 2, and 3, but no distracton was performed. Proliferating cell nuclei were labeled with 5-bromo-2-deoxyuridine and were identified by immunohistochemical staining. The weight of the muscle was measured. During bone lengthening the muscle showed signs of growth, as indicated by increasing weight and number of proliferating cell nuclei. This was observed only during lengthening and it ceased when the lengthening was stopped. 相似文献
16.
Suppressing inhibition mediated by GABAA receptors induces rhythmic bursts of synchronous firing in the CA3 region of the hippocampus. Extracellular and intracellular records were made from guinea pig hippocampal slices to examine the emergence of this synchrony. We found that application of GABAA receptor antagonists initiated a sequence of changes in the activity of the CA3 neuronal population. First, the frequency of firing detected in multiunit records increased. Then, firing began to oscillate with increases followed by decreases in firing that occurred at intervals of 0.5–2 s. The coherence of the rhythmic activity at a single site increased with time, and discharges at distant sites in the CA3 region became correlated. Fluctuations in firing were associated with extracellular field potentials. Finally, epileptiform events associated with large field potentials began to recur at intervals of 5–10 s. The onset of fully synchronous events was sudden and correlated with a large increase in the amplitude of the field potential. Thus the CA3 population can express states of partial population synchrony preceding the onset of epileptiform discharges. A similar activity was induced and maintained by applying low doses of GABAA receptor antagonists. Intracellular records suggest that inhibitory signalling mediated by GABAB receptors contributes to the emergence of this activity. States of partial synchrony in the CA3 region exposed to GABAA receptor antagonists therefore depend on alternating periods of firing, presumably dependent on excitatory synaptic mechanisms, and silence, mediated in part by the activation of GABAB receptors. 相似文献
17.
Ivan Izquierdo 《Trends in pharmacological sciences》1989,10(12):473-476
18.
Augusto Giussani Adeseye M Arogunjo Marie Claire Cantone Federico Tavola Ivan Veronese 《Applied radiation and isotopes》2006,64(6):639-644
The intestinal absorption of molybdenum in healthy human volunteers has been measured by simultaneous oral and intravenous administration of the stable isotopes 95Mo and 96Mo, and the results were analysed using the convolution integral technique. The results showed that molybdenum ingested in liquid form was rapidly and totally absorbed into the circulation under ordinary intake regimes. The rates and extent of absorption were lower for composite meals, and also for increasing levels of administration. This information can be helpful in the application of the new ICRP model of the human alimentary tract. 相似文献
19.
20.