全文获取类型
收费全文 | 801篇 |
免费 | 43篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 40篇 |
妇产科学 | 11篇 |
基础医学 | 76篇 |
口腔科学 | 33篇 |
临床医学 | 83篇 |
内科学 | 191篇 |
皮肤病学 | 4篇 |
神经病学 | 51篇 |
特种医学 | 107篇 |
外科学 | 103篇 |
综合类 | 35篇 |
一般理论 | 1篇 |
预防医学 | 27篇 |
眼科学 | 9篇 |
药学 | 65篇 |
中国医学 | 1篇 |
肿瘤学 | 20篇 |
出版年
2022年 | 4篇 |
2021年 | 12篇 |
2020年 | 5篇 |
2019年 | 9篇 |
2018年 | 5篇 |
2017年 | 6篇 |
2016年 | 9篇 |
2015年 | 11篇 |
2014年 | 18篇 |
2013年 | 31篇 |
2012年 | 23篇 |
2011年 | 30篇 |
2010年 | 29篇 |
2009年 | 24篇 |
2008年 | 30篇 |
2007年 | 34篇 |
2006年 | 24篇 |
2005年 | 20篇 |
2004年 | 16篇 |
2003年 | 25篇 |
2002年 | 21篇 |
2001年 | 18篇 |
2000年 | 23篇 |
1999年 | 24篇 |
1998年 | 26篇 |
1997年 | 29篇 |
1996年 | 29篇 |
1995年 | 24篇 |
1994年 | 21篇 |
1993年 | 18篇 |
1992年 | 14篇 |
1991年 | 9篇 |
1990年 | 18篇 |
1989年 | 31篇 |
1988年 | 34篇 |
1987年 | 27篇 |
1986年 | 14篇 |
1985年 | 10篇 |
1984年 | 7篇 |
1983年 | 11篇 |
1982年 | 5篇 |
1981年 | 8篇 |
1980年 | 12篇 |
1979年 | 6篇 |
1978年 | 5篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1943年 | 3篇 |
1931年 | 4篇 |
1929年 | 3篇 |
排序方式: 共有861条查询结果,搜索用时 15 毫秒
101.
GF Nash KJ Turner T Hickish J Smith M Chand BJ Moran 《Annals of the Royal College of Surgeons of England》2012,94(7):456-462
Adenocarcinoma of the prostate and rectum are common male pelvic cancers and may present synchronously or metachronously and, due to their anatomic proximity. The treatment of rectal or prostate cancer (in particular surgery and/or radiotherapy) may alter the presentation, incidence and management should a metachronous tumour develop. This review focuses on the interaction between prostatic and rectal cancer diagnosis and management. We have restricted the scope of this large topic to general considerations, management of rectal cancer after prostate cancer treatment and vice versa, management of synchronous disease and cancer follow-up issues. 相似文献
102.
Both Neisseria meningitidis and Streptococcus pneumoniae are naturally transformable species and are known to be freely recombining in the wild. Large multilocus sequence typing (MLST) datasets have been generated for these species. Here we outline an approach which exploits these data sets in order to quantify the extent of recombination, thus enabling meaningful comparisons between the two species. Two parameters are estimated; the rate at which recombination changes alleles, compared to point mutation, and the rate at which recombination changes individual nucleotide sites, compared to point mutation. Estimates for the former parameter are 4:1 in the meningococcus (i.e. alleles are changed four-fold more frequently by recombination than by mutation), and 10:1 in the pneumococcus. However, estimates for the latter parameter are at least 80:1 in the meningococcus (i.e. an individual nucleotide site is at least 80-fold more likely to change by recombination than by mutation) and 50:1 in the pneumococcus. These data imply that recombination events, compared to mutational events, may be more common in the pneumococcus than in the meningococcus. However, because it is a more diverse species, each recombinational exchange in the meningococcus results in more nucleotide changes on average. 相似文献
103.
Two cases of hemiplegia are reported; one patient had auricutoventricular rhythm, and the other, complete heart block. The latter patient came to autopsy, and widespread encephalomalacia in the area supplied by the middle cerebral artery was found. No thrombi were found in the arteries. The obstruction may have been in the artery in its course through the carotid canal or the cavernous sinus. 相似文献
104.
Harold Feil 《American heart journal》1942,23(5):736-737
105.
106.
107.
M. Strupp C. Muth N. Böttcher O. Bayer J. Teufel K. Feil T. Bremova O. Kremmyda C.S. Fischer 《HNO》2013,61(9):762-771
In most patients with vertigo, the first and clinically most important question posed to neurologists is whether it is a central or a peripheral syndrome. In more than 90?% of cases, this differentiation is made possible by systematically recording the patient history (asking about the type of vertigo, the duration, triggers and accompanying symptoms) and conducting a physical examination. Particularly in the case of acute vertigo disorders, a five-step procedure has proven useful: 1. A cover test to look for vertical divergence (skew deviation) as a central sign and component of the ocular tilt reaction (OTR); 2. Examination with and without Frenzel goggles to differentiate between peripheral vestibular spontaneous nystagmus and central fixation nystagmus; 3. Examination of smooth pursuit; 4. Examination of the gaze-holding function (particularly gaze-evoked nystagmus beating in the opposite direction to spontaneous nystagmus); 5. The head impulse test to look for a deficit in the vestibulo-ocular reflex (VOR). Considerable advances have been made in the pharmacotherapy of vertigo disorders during the last 10 years, including cortisone for the treatment of acute vestibular neuritis, betahistine as a high-dose long-term treatment for Menière’s disease, carbamazepine to treat vestibular paroxysmia and aminopyridine for down- and upbeat nystagmus and episodic ataxia type 2. 相似文献
108.
109.
G D Paulson V J Feil J J McDonald 《Xenobiotica; the fate of foreign compounds in biological systems》1990,20(4):395-400
1. Six hours after rats were orally dosed with 1,3-di-(4-[N-(4,6-dimethyl-2-pyrimidinyl)sulphamoyl][U-14C]phenyl) triazene (14C-DDPSPT), approx. 81% of the 14C remained in the gastrointestinal tract (gut) and less than 3% was excreted in the urine. 2. Six hours after dosing, more than half of the 14C in the gut was present as DDPSPT. 14C-Labelled metabolites in the gut included 4-amino-N-(4,6-dimethyl-2-pyrimidinyl)-benzenesulphonamide (Sulmet), N4-glucosyl-N-(4,6-dimethyl-2-pyrimidinyl)benzenesulphonamide (N4-gluc-Sulmet), 4-acetamido-N-(4,6-dimethyl-2-pyrimidinyl)benzenesulphonamide (N4-acetyl-Sulmet), and [N-4,6-dimethyl-2-pyrimidinyl) benzenesulphonamide] (desamino-Sulmet). 3. 14C-Labelled compounds in the blood, liver and skeletal muscle included DDPSPT, Sulmet, N4-gluc-Sulmet, N4-acetyl-Sulmet and desamino-Sulmet. 4. There was little or no reaction of DDPSPT with cysteine, bovine serum albumin, AMP, GMP, or calf thymus deoxyribonucleic acid in vitro (pH 3, 5, 7 or 8). 相似文献
110.
Twenty patients, aged 4 months to 58 years, were evaluated for liver transplantation by duplex sonography, and 15 transplantations were completed; 42 postoperative examinations were performed. Sonographic findings were correlated with seven preoperative and five postoperative angiographic evaluations. Preoperative duplex US findings included tumors, portal vein occlusion, varices, biliary obstruction, and variant vascular anatomy. Postoperative findings included hepatic artery occlusion, portal vein occlusions (one with cavernous transformation), portal vein stenosis, biliary obstruction, intrahepatic and extrahepatic fluid collections, and air in the portal vein due to ischemic bowel. Use of angiography allowed confirmation of the vascular abnormalities and demonstrated evidence of rejection in patients with normal Doppler waveforms. Duplex sonography is a valuable portable technique for evaluating these patients and can be used in triage of patients requiring angiography. 相似文献