全文获取类型
收费全文 | 19728篇 |
免费 | 1267篇 |
国内免费 | 613篇 |
专业分类
耳鼻咽喉 | 585篇 |
儿科学 | 570篇 |
妇产科学 | 76篇 |
基础医学 | 934篇 |
口腔科学 | 83篇 |
临床医学 | 2593篇 |
内科学 | 5428篇 |
皮肤病学 | 27篇 |
神经病学 | 1817篇 |
特种医学 | 1668篇 |
外科学 | 3383篇 |
综合类 | 2719篇 |
现状与发展 | 2篇 |
预防医学 | 302篇 |
眼科学 | 195篇 |
药学 | 688篇 |
6篇 | |
中国医学 | 340篇 |
肿瘤学 | 192篇 |
出版年
2024年 | 57篇 |
2023年 | 328篇 |
2022年 | 606篇 |
2021年 | 848篇 |
2020年 | 821篇 |
2019年 | 769篇 |
2018年 | 807篇 |
2017年 | 579篇 |
2016年 | 643篇 |
2015年 | 719篇 |
2014年 | 1346篇 |
2013年 | 1319篇 |
2012年 | 1001篇 |
2011年 | 1148篇 |
2010年 | 959篇 |
2009年 | 916篇 |
2008年 | 906篇 |
2007年 | 934篇 |
2006年 | 866篇 |
2005年 | 763篇 |
2004年 | 612篇 |
2003年 | 545篇 |
2002年 | 438篇 |
2001年 | 362篇 |
2000年 | 349篇 |
1999年 | 304篇 |
1998年 | 295篇 |
1997年 | 243篇 |
1996年 | 206篇 |
1995年 | 218篇 |
1994年 | 186篇 |
1993年 | 171篇 |
1992年 | 170篇 |
1991年 | 135篇 |
1990年 | 107篇 |
1989年 | 114篇 |
1988年 | 95篇 |
1987年 | 76篇 |
1986年 | 79篇 |
1985年 | 101篇 |
1984年 | 85篇 |
1983年 | 43篇 |
1982年 | 82篇 |
1981年 | 66篇 |
1980年 | 62篇 |
1979年 | 37篇 |
1978年 | 32篇 |
1977年 | 15篇 |
1976年 | 15篇 |
1975年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 24 毫秒
41.
The records of an ongoing Health Surveillance Registry that utilizes multiple sources of ascertainment were used to study the incidence rate of infantile hypertrophic pyloric stenosis (IHPS) in liveborn children in British Columbia during the period 1966–1977 inclusive. The incidence was 4.6 males/1,000 livebirths and 1.2 females/1,000 livebirths, giving a male to female ratio of 3.1 to 1. No significant overall incidence variations with time could be shown during the study period. There was suggestive evidence of independent sex-incidence variation in different geographical regions, which clearly warrants further investigation. 相似文献
42.
Vio K Rodríguez S Navarrete EH Pérez-Fígares JM Jiménez AJ Rodríguez EM 《Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale》2000,135(1):41-52
Stenosis of the cerebral aqueduct seems to be a key event for the development of congenital hydrocephalus. The causes of such a stenosis are not well known. Overholser et al. in 1954 (Anat Rec 120:917-933) proposed the hypothesis that a dysfunction of the subcommissural organ (SCO) leads to aqueductal stenosis and congenital hydrocephalus. The SCO is a brain gland, located at the entrance of the cerebral aqueduct, that secretes glycoproteins into the cerebrospinal fluid that, upon release, assemble into a fibrous structure known as Reissner's fiber (RF). By the permanent addition of new molecules to its rostral end, RF grows and extends along the aqueduct, fourth ventricle, and central canal of the spinal cord. The immunological blockage of the SCO-RF complex has been used to test Overholser's hypothesis. The following was the sequence of events occurring in pregnant rats that had been immunized with RF glycoproteins: the mother produced anti-RF antibodies and transferred them to the fetus through the placenta and to the pup through the milk, and the antibodies reached the brain of the fetus and pup and blocked the SCO-RF complex. This resulted in a permanent absence of RF that was followed by stenosis of the cerebral aqueduct, and then by the appearance of hydrocephalus. The latter was patent until the end of the 6-month observation period. The chronic hydrocephalic state appeared, in turn, to induce new alterations of the SCO. It is concluded that a selective immunological knock out of the SCO-RF complex leads to hydrocephalus. 相似文献
43.
Ei Kawahara Yoshio Oda Shogo Katsuda Isao Nakanishi Kunihiko Aoyama Katsuro Tomita 《Virchows Archiv : an international journal of pathology》1991,419(5):373-380
Summary Thickened ligamenta flava obtained from 14 patients with spinal canal stenosis were examined with special reference to type VI collagen. The characteristic histological finding in the thickened area was rupture of normal elastic fibre meshwork with resultant fibrosis which usually appeared hyaline. Using an immunohistological method, collagen types VI, I and III were found to be present in the hyaline matrix. Ultrastructural study revealed many microfilamentous structures of type VI collagen admixed in loosely packed, banded collagen fibres. With differential salt precipitation of pepsin-extracted collagen the existence of type VI collagen was confirmed by SDS-polyacrylamide gel electrophoresis analysis and Western blotting analysis using anti-type VI collagen antibody. Quantification of type VI collagen in pepsin-extracted crude collagen samples by an inhibition enzyme-linked immunosorbent assay showed an increasing amount of type VI collagen in the thickened ligamenta flava compared to the normal ligaments. Thus, increase of type VI collagen is the main contribution to the thickening of the ligamentum flavum. This may represent an adaptational and reparative process associated with disruption of elastic fibres. 相似文献
44.
Robert H. Ardinger Kenneth K. Goertz Leone F. Mattioli 《American journal of medical genetics. Part A》1994,51(3):200-202
We report on a patient with Williams syndrome who suffered a cerebrovascular accident. Clinical evaluation demonstrated the presence of carotid and cerebral arterial stenoses. We believe these lesions led to acute cerebrovascular ischemia and a non-hemorrhagic cerebral infarction. It is possible the stenoses were exacerbated by a vasculitis. The stenoses were identified by both invasive and noninvasive imaging studies. These studies may have a role in the evaluation of persons with Williams syndrome. © 1994 Wiley-Liss, Inc. 相似文献
45.
There are two sets of peripheral arterial chemoreceptors in the cat, the carotid bodies innervated by the carotid sinus nerve and the aortic bodies with afferents in the aortic depressor nerves. Reflex stimulation of ventilation in response to hypoxia is abolished acutely after interrupting the sensory pathway from the carotid body chemoreceptors in the cat even though the reflex pathway from the aortic body chemoreceptors is intact. However, in chronically maintained preparations, there is a restoration of the hypoxic response which is mediated by the aortic chemoreflex pathway. It was proposed that restoration was due to a ‘central reorganization’ of chemoreflex pathways which followed interruption of the sensory pathway from the carotid bodies and that the reorganization enhanced the efficacy of the aortic ventilation chemoreflex. This proposal was tested in the present experiments by measuring reflex ventilatory and cardiovascular responses to electrical stimulation of the sensory nerves containing aortic and carotid chemoreceptor afferents following bilateral interruption of carotid sinus nerves and carotid body resection. Responses measured acutely (1–6 h) after interruption were compared with those measured 60–80 and 110–140 days later. At 60–80 days, a chemoreflex response (increase in tidal volume of ventilation) to stimulation of the interrupted carotid sinus sensory pathway was markedly attenuated while the response to stimulation of the uninterrupted pathway in aortic depressor nerves was enhanced. At 110–140 days, the tidal volume response to carotid sinus nerve stimulation was greatly enhanced while the aortic depressor nerve response declined from the elevated level. There were significant but less pronounced changes in the response of other ventilatory and cardiovascular variables to aortic depressor nerve and carotid sinus nerve stimulation.The results support the idea that there is a ‘central reorganization’ of chemoreflex pathways which is reflected functionally by changes in the efficacy of reflexes evoked from aortic depressor nerve and carotid sinus nerve. The changes are analagous to those occurring in somatic reflexes during regeneration of sensory nerves. It is suggested that the changes in efficacy of carotid sinus nerve reflexes are due to a degenerative loss of synapses of the central projections of interrupted carotid sinus nerve sensory axons (degenerative atrophy) and subsequent regenerative like changes (regenerative proliferation) in the central projections. The changes in the efficacy of aortic depressor nerve reflexes may be attributed to formation of new synapses by converging central projections of this uninterrupted pathway (reactive synaptogenesis) and subsequent regression of the newly formed synapses. 相似文献
46.
47.
G. Pozzessere E. Valle A. Santoro R. Delfini P. A. Rizzo G. P. Cantore C. Morocutti 《Acta neurochirurgica》1987,89(1-2):28-33
Summary The authors have reported on the prognostic value of continuous monitoring of somatosensory evoked potentials (SEP) in a survey of 25 patients who underwent carotid surgery. SEP recordings were correlated with the EEG, stump pressure (SP) values and clinical outcome. A non-cephalic reference was used for SEP recordings to allow the analysis of both subcortical and cortical components. During surgery the conduction time between SEP peaks relating to the subcortical components remained stable or showed minimum variations in all patients. During carotid clamping, SEP variations were observed in 9 out of 25 cases (36%). The application of an intraluminal shunt was accompanied by the return to normal values in 7 out of 9 patients. In the remaining two cases SEP abnormalities continued post-operatively and were accompanied by new neurological deficits. EEG changes during carotid clamping were associated with SEP modifications in 6 out of 7 cases, although they were not always correlated. Results confirm that SEP recordings provide useful data concerning the function of the CNS in anaesthetized patients and that, being sensitive to CBF changes, SEP monitoring acts as an indicator of cerebral ischaemia.Presented in part at the Third International Evoked Potentials Symposium, Berlin-West, September 28th–October 1st, 1986. 相似文献
48.
G. P. Cantore R. Delfini A. Mariottini A. Santoro P. Cascone 《Acta neurochirurgica》1987,86(1-2):56-60
Summary Anterior displacement of the mandible (ADM) was performed in 34 patients undergoing surgery for malformations or atheromatous lesions of the distal segment of the extracranial internal carotid artery (ICA). This procedure greatly facilitates surgical access to the upper cervical region and has several advantages over mandibulotomy-mandibulectomy, namely: A shorter operating time, sparing of the inferior alveolar nerve and of the mandibular branch of cranial nerve VII, with no need for post-operative immobilization of the mandible. ADM permits the correction of ICA lesions extending as far as the first cervical vertebra. For lesions extending into the carotid canal ADM needs to be supplemented by various other procedures via the base of the skull. 相似文献
49.
Summary This is a review of 1,000 consecutive cases of severe head injury admitted to our Neurosurgical Department between January 1973 and August 1976, before the advent of CT scanning. All patients were comatose following head injury (GCS8) and were treated homogeneously by the same neurosurgical team by a protocol that included immediate resuscitation on arrival, diagnosis of intracranial lesions by angiography, early surgery when needed, mechanical ventilation, steroids, and mannitol. Extracranial lesions, even if preponderant, were treated by various specialists in the Neurosurgical Department, which for all practical purposes operated as an Emergency Department. Admission criteria were very broad with no preadmission selection. The overall mortality for this series was 45%. A little less than half the patients made good recoveries or remained moderately disabled (47%); 6% were severely disabled, and 2% survived in a persistent vegetative state. More than two-thirds of the patients were brought to our Neurosurgical Department after a short stay at a general hospital; 72% were admitted within 6 hours of injury; 71% were traffic accident victims; and 34% had significant associated extracranial injuries. Carotid angiography was performed in 78% of the patients and indicated the presence of an intracranial haematoma requiring surgery in 36% of the whole series. Mortality was significantly higher in operated than in unoperated patients (56% versus 39%); those treated surgically, however, were older, in worse clinical condition, and showed a higher incidence of acute subdural haematomas associated with brain contusion. Carotid angiography proved very effective in revealing the presence of an expansive lesion but failed to reflect the severity of brain damage, since the group with negative angiograms showed a high mortality (52%). Patients with a lucid interval had a higher percentage of surgical lesions than those with immediate coma (58% versus 26%); but fully 42% of them did not require surgery, and 25% had negative angiograms. From the prognostic point of view the clinical data elicited after initial resuscitation were highly predictive of the outcome: some individual neurological signs, such as mydriasis, posturing and eye movements, were not inferior to the GCS score in that respect. Age also proved a strong predictor, since elderly patients are more likely to have severe subdural and parenchymal lesions and their clinical severity is accordingly greater.Our series amounts to a data bank of cases both contemporary to and in good agreement with that collected by Jennett and his associates in their 1977 multinational study; and it affords a useful reference in the assessment of epidemiological variations and alternative management in relation to outcome. 相似文献