全文获取类型
收费全文 | 4421篇 |
免费 | 241篇 |
国内免费 | 36篇 |
专业分类
耳鼻咽喉 | 144篇 |
儿科学 | 85篇 |
妇产科学 | 72篇 |
基础医学 | 553篇 |
口腔科学 | 135篇 |
临床医学 | 193篇 |
内科学 | 1243篇 |
皮肤病学 | 43篇 |
神经病学 | 402篇 |
特种医学 | 122篇 |
外科学 | 882篇 |
综合类 | 11篇 |
预防医学 | 79篇 |
眼科学 | 42篇 |
药学 | 255篇 |
中国医学 | 22篇 |
肿瘤学 | 415篇 |
出版年
2023年 | 45篇 |
2022年 | 72篇 |
2021年 | 115篇 |
2020年 | 75篇 |
2019年 | 111篇 |
2018年 | 124篇 |
2017年 | 85篇 |
2016年 | 120篇 |
2015年 | 95篇 |
2014年 | 166篇 |
2013年 | 167篇 |
2012年 | 290篇 |
2011年 | 275篇 |
2010年 | 143篇 |
2009年 | 123篇 |
2008年 | 233篇 |
2007年 | 251篇 |
2006年 | 258篇 |
2005年 | 262篇 |
2004年 | 248篇 |
2003年 | 230篇 |
2002年 | 205篇 |
2001年 | 67篇 |
2000年 | 91篇 |
1999年 | 125篇 |
1998年 | 60篇 |
1997年 | 52篇 |
1996年 | 35篇 |
1995年 | 27篇 |
1994年 | 42篇 |
1993年 | 29篇 |
1992年 | 60篇 |
1991年 | 40篇 |
1990年 | 35篇 |
1989年 | 40篇 |
1988年 | 43篇 |
1987年 | 32篇 |
1986年 | 26篇 |
1985年 | 31篇 |
1984年 | 24篇 |
1983年 | 13篇 |
1982年 | 9篇 |
1981年 | 12篇 |
1980年 | 7篇 |
1979年 | 22篇 |
1978年 | 8篇 |
1977年 | 7篇 |
1976年 | 9篇 |
1974年 | 8篇 |
1969年 | 10篇 |
排序方式: 共有4698条查询结果,搜索用时 15 毫秒
21.
22.
Finger bougie method compared with pyloroplasty in the gastric replacement of the esophagus 总被引:2,自引:0,他引:2
Yamashita Y Hirai T Mukaida H Yoshimoto A Kuwahara M Inoue H Toge T 《Surgery today》1999,29(2):107-110
To elucidate the necessity of pyloroplasty for the gastric tube through the posterior mediastinum in esophageal surgery, gastric
emptying and duodenogastric reflux (DGR) were evaluated in 16 cases undergoing an anterior pylorectomy (group P) and in 16
cases treated by the finger bougie method (group F). First, the obstruction and reflux symptoms were examined based on a patient
questionnaire using a brief scoring system. The median value of the symptom score showed the patients in P to have more symptoms
than those in F; however, the difference was not significant (8.0 vs 6.0). Secondly, the swallowed Tc O4
− (85 MBq) was counted using a gamma camera at three sites on the sternal bone in the upright position based on a gastric transit
scintigram. Both the descending time of the RI peak and the clearance rates were similar between the two groups. Thirdly,
intragastric 24-h pH monitoring was carried out. Antimony pH sensors were anchored 5 and 15 cm below the esophagogastrostomy.
We could not find any difference between the two groups in both the % time pH>4 and %time pH>7. These findings thus revealed
no big difference between groups P and F. The finger bougie method to drain the vagotomized posterior mediastinal stomach
was found to achieve results similar to conventional pyloroplasty, while it was also simpler and safer. 相似文献
23.
Tetsuo Hadama Yoshiaki Mori Osamu Shigemitsu Tatsunori Kimura Shinji Miyamoto Hidenori Sako Tooru Soeda Toshihide Yoshimatsu Yuzo Uchida 《Surgery today》1996,26(1):60-63
We report herein the rare case of a 79-year-old man who suffered permanent paraplegia after undergoing an otherwise successful total arch replacement for a ruptured aortic arch aneurysm. During cardiopulmonary bypass, perfusion to the distal aorta was maintained from the femoral artery, and postoperative aortography showed intact tributaries from the aorta including the intercostal arteries. Postoperative paraplegia is an extremely rare complication of operations on the aortic arch; however, we speculate that the paraplegia in this patient could be attributed either to a steal phenomenon involving the radicular artery, or to the anatomical particularity of the spinal cord artery described by Cole and Gutelius as the segmental system. 相似文献
24.
25.
A. Tamura K. Agematsu R. Urasawa K. Naganuma A. Komiyama 《European journal of pediatrics》1998,157(6):475-478
Systemic lupus erythematosus (SLE) was observed in a 7-year-old boy with IgG2 and IgG4 subclass deficiencies who had been treated with immunoglobulin (100–200 mg/kg/4 weeks) since 2 years of age. The mother and
the half-brother displayed the same deficiency. Serum IgG mainly consisted of IgG1 (98.9%) during the acute phase of SLE due to transient IgG3 deficiency. While he had no common manifestations of SLE such as arthritis or nephropathy, he developed cardiac tamponade
due to massive pericardial effusion.
Conclusion The clinical features of SLE in the present case such as the development of cardiac tamponade and the absence of renal involvement
may result from the markedly imbalanced IgG subclass distribution among auto-antibodies.
Received: 20 May 1997 and in revised form: 7 October 1997 / Accepted: 21 October 1997 相似文献
26.
To understand malalignments of the visual axes in one-and-a-half syndrome, we measured eye positions in 4 patients with this syndrome under two conditions: with Frenzel goggles to prevent eye fixation and without Frenzel goggles. When fixation was prevented with the Frenzel goggles, all patients showed mild outward deviation in both eyes. Removal of the Frenzel goggles elicited adduction of the eye ipsilateral to the side of the lesion for fixation, with greater outward deviation of the contralateral eye (acute stage), or adduction of both eyes to midposition for biocular fixation (convalescent stage). In 3 patients whose outward eye deviation with Frenzel goggles was greater on the ipsilateral side, a transition from one-and-a-half syndrome to ipsilateral internuclear ophthalmoplegia was noted, whereas a transition to ipsilateral gaze palsy was seen in the one patient whose deviation was greater on the contralateral side. These findings suggest that in one-and-a-half syndrome patients, the eyes tend to be in divergent positions when fixation is prevented; ipsilateral eye deviation may result from medial longitudinal fasciculus involvement, and contralateral eye deviation may result from paramedian pontine reticular formation involvement. Viewing a target may lead to a secondary deviation or adaptation of eye positions for fixation. 相似文献
27.
To evaluate the steno-occlusive changes in the external carotid system in moyamoya disease, cerebral angiograms of 39 moyamoya patients were retrospectively reviewed. There were 26 females and 13 males, age ranged from 4 to 62 years with a mean of 26 years. Initial symptoms were ischaemia in 27 patients, haemorrhage in 9, and none in 3. Stenosis, occlusion, and dilatation in the external carotid system were analysed angiographically. No stenosis or occlusion of the superficial temporal artery, middle meningeal artery, or occipital artery was observed in either preoperative or postoperative follow-up angiograms in any patients. Steno-occlusive changes do not occur in the external carotid system, but are confined in the internal carotid system in moyamoya disease. 相似文献
28.
29.
Involvement of catalase in the endometrium of patients with endometriosis and adenomyosis 总被引:3,自引:0,他引:3
OBJECTIVE: To determine the distribution of catalase in eutopic and ectopic endometria in patients with endometriosis or adenomyosis. DESIGN: Retrospective randomized study. SETTING: Department of obstetrics and gynecology in a university hospital. PATIENT(S): Thirty-three patients with endometriosis, 36 with adenomyosis, and 47 fertile controls (total, 116 women). MAIN OUTCOME MEASURE(S): Semiquantitative immunostaining of endometrial cells obtained by biopsy sampling, followed by calculation of an evaluation nomogram score. RESULT(S): The score of catalase in the glandular epithelium of controls group fluctuated during the menstrual cycle; it was lowest in the early proliferative phase and peaked in the late secretory phase. In patients with endometriosis, catalase scores did not fluctuate during the cycle, and scores were high compared with controls throughout the menstrual cycle. Catalase scores did not vary in patients with adenomyosis, and scores in this group were consistently higher than those in patients with endometriosis throughout the cycle. CONCLUSION(S): Abnormal expression of catalase in the eutopic and ectopic endometrium strongly suggests pathologic involvement of free radicals in endometriosis and adenomyosis. 相似文献
30.
Daisuke Tamanoi Koichi Saruwatari Kosuke Imamura Ryo Sato Takuya Jodai Shohei Hamada Yusuke Tomita Sho Saeki Shikiko Ueno Yuji Yonemura Hidenori Ichiyasu Takuro Sakagami 《Internal medicine (Tokyo, Japan)》2022,61(11):1731
The effect of radiotherapy during immunotherapy on immune-related adverse events (irAEs) is not fully understood. We herein report a 74-year-old woman diagnosed with lung adenocarcinoma with programmed death ligand 1 expression ≥50% and treated with pembrolizumab. She developed fatal immune thrombocytopenia associated with pembrolizumab immediately following radiotherapy. A flow cytometry analysis of peripheral blood detected an increased expression of programmed death-1 (PD-1) and Ki-67 in CD4+ and CD8+ T cells after radiotherapy, compared with pre-irradiation measurements. This case suggests that radiotherapy may evoke irAEs during treatment with anti-PD-1 antibodies, which physicians should consider when using radiotherapy in patients treated with these drugs. 相似文献