全文获取类型
收费全文 | 9715篇 |
免费 | 819篇 |
国内免费 | 86篇 |
专业分类
耳鼻咽喉 | 25篇 |
儿科学 | 458篇 |
妇产科学 | 187篇 |
基础医学 | 1469篇 |
口腔科学 | 356篇 |
临床医学 | 1091篇 |
内科学 | 1780篇 |
皮肤病学 | 172篇 |
神经病学 | 1062篇 |
特种医学 | 452篇 |
外科学 | 1032篇 |
综合类 | 224篇 |
一般理论 | 10篇 |
预防医学 | 799篇 |
眼科学 | 124篇 |
药学 | 744篇 |
中国医学 | 30篇 |
肿瘤学 | 605篇 |
出版年
2021年 | 137篇 |
2020年 | 98篇 |
2019年 | 143篇 |
2018年 | 151篇 |
2017年 | 122篇 |
2016年 | 134篇 |
2015年 | 143篇 |
2014年 | 195篇 |
2013年 | 308篇 |
2012年 | 441篇 |
2011年 | 405篇 |
2010年 | 291篇 |
2009年 | 239篇 |
2008年 | 424篇 |
2007年 | 426篇 |
2006年 | 393篇 |
2005年 | 383篇 |
2004年 | 345篇 |
2003年 | 355篇 |
2002年 | 330篇 |
2001年 | 296篇 |
2000年 | 290篇 |
1999年 | 247篇 |
1998年 | 161篇 |
1997年 | 155篇 |
1996年 | 138篇 |
1995年 | 145篇 |
1994年 | 108篇 |
1993年 | 115篇 |
1992年 | 188篇 |
1991年 | 228篇 |
1990年 | 170篇 |
1989年 | 234篇 |
1988年 | 232篇 |
1987年 | 285篇 |
1986年 | 208篇 |
1985年 | 254篇 |
1984年 | 151篇 |
1983年 | 117篇 |
1982年 | 94篇 |
1981年 | 95篇 |
1980年 | 85篇 |
1979年 | 106篇 |
1978年 | 112篇 |
1977年 | 98篇 |
1976年 | 68篇 |
1975年 | 79篇 |
1974年 | 77篇 |
1973年 | 72篇 |
1972年 | 72篇 |
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
1.
Suchi Raghunathan Corey L. Reynolds Robert J. Schwartz M. David Stewart Bradley K. McConnell 《Fundamental & clinical pharmacology》2019,33(1):25-30
Inbred mouse strains are the most widely used mammalian model organism in biomedical research owing to ease of genetic manipulation and short lifespan; however, each inbred strain possesses a unique repertoire of deleterious homozygous alleles that can make a specific strain more susceptible to a particular disease. In the current study, we report dystrophic cardiac calcinosis (DCC) in C.B‐17 SCID male mice at 10 weeks of age with no significant change in cardiac function. Acquisition of DCC was characterized by myocardial injury, fibrosis, calcification, and necrosis of the tissue. At 10 weeks of age, 38% of the C.B‐17 SCID mice from two different commercial colonies exhibited significant calcinosis on the ventricular epicardium, predominantly on the right ventricle. The frequency of calcinosis was more than 50% for mice obtained from Taconic's Cambridge City colony and 25% for mice obtained from Taconic's German Town colony. Interestingly, the DCC phenotype did not affect cardiac function at 10 weeks of age. No differences in echocardiography or electrocardiography were observed between the calcinotic and non‐calcinotic mice from either colony. Our findings suggest that C.B‐17 SCID mice exhibit DCC as early as 10 weeks of age with no significant impact on cardiac function. This strain of mice should be cautiously considered for the study of cardiac physiology. 相似文献
2.
3.
4.
Sodium MRI of the human kidney at 3 Tesla. 总被引:6,自引:0,他引:6
Nimrod Maril Yael Rosen Glenn H Reynolds Alex Ivanishev Long Ngo Robert E Lenkinski 《Magnetic resonance in medicine》2006,56(6):1229-1234
The sodium concentration gradient in the kidney (from the cortex to the medulla) serves to regulate fluid homeostasis and is tightly coupled to renal function. It was previously shown that renal function and pathophysiology can be characterized in rat kidneys by measuring the sodium gradient with (23)Na MRI. This study demonstrates for the first time the ability of (23)Na MRI to map the distribution of sodium in the human kidney and to quantify the corticomedullary sodium gradient. The study was performed on a 3T Signa LX scanner (GE) using an in-house-built quadrature surface coil. (23)Na images of volunteers were acquired using a 3D coronal gradient-echo sequence at a spatial resolution of 0.3 x 0.3 x 1.5 cm(3) in a 25-min scan time. The signal intensity (relative to the noise) increased linearly from the cortex to each of the medullae with a mean slope of 1.6 +/- 0.2 in relative arbitrary units per mm (Rel.u./mm, N = 6) and then decreased, as expected, toward the renal pelvis. Water deprivation (12 hr) induced a significant increase of 25% (P < 0.05) in this gradient. Based on these results, we suggest that sodium MRI can serve as a valuable noninvasive method for functional imaging of the human kidney. 相似文献
5.
In newly diagnosed adult patients with epilepsy followed prospectively on monotherapy, carbamazepine and phenytoin were associated with a fall in plasma uric acid, but sodium valproate and phenobarbitone were associated with a rise in plasma uric acid. The mechanisms and significance of these findings are discussed. 相似文献
6.
Intrathecal morphine in an average dose of 0.01 mg/kg was given to 33 patients between ages 11 and 16 years who had spinal arthrodesis for idiopathic scoliosis. The morphine was administered intrathecally as a 10 cc bolus at the conclusion of the arthrodesis, but before closure. The goal was to study safety in terms of respiratory depression and pain relief. Respirations occurred spontaneously in 30 of the 33 patients within 15 minutes of cessation of anesthesia. Respiratory depression occurred in five patients, four of whom had arterial blood pCO2 levels greater than 60 mm Hg. Thirty-one patients had relief of pain for 8 to greater than 40 hours, averaging 18 hours. Two patients had no noticeable pain relief. There appeared to be no relation between dose and pain relief in this limited dose range. We were unable to duplicate the long duration of pain relief reported elsewhere. We also were unable to decrease the side effects of respiratory depression and nausea to a level reported by others. It may be that the 10 cc bolus injected intrathecally circulates to the brain and ventricles faster than desired, or that factors relating to type of anesthesia or dose need to be considered. Low-dose intrathecal morphine does provide noticeable pain relief in younger patients undergoing spinal fusion. The side effects of nausea and respiratory depression can be managed safely with medication. 相似文献
7.
8.
RPE Reynolds 《Journal canadien de gastroenterologie》2007,21(11):697-698
9.
Aisling Mary McMahon Fardod O'Kelly Kheng Tian Lim Narayanasamy Ravi John Vincent Reynolds 《Patient safety in surgery》2009,3(1):19
Esophageal perforation is associated with a significant risk of morbidity and mortality. We report herein a case of lye-induced
esophageal perforation managed successfully by employing endoscopic T-tube placement with a successful outcome. 相似文献
10.
Association of Hypoalbuminemia on the First Postoperative Day and Complications Following Esophagectomy 总被引:1,自引:0,他引:1
Aoife M. Ryan Aine Hearty Ruth S. Prichard Aileen Cunningham Suzanne P. Rowley John V. Reynolds 《Journal of gastrointestinal surgery》2007,11(10):1355-1360
Objective Changes in serum albumin may reflect systemic immunoinflammation and hypermetabolism in response to insults such as trauma
and sepsis. Esophagectomy is associated with a major metabolic stress, and the aim of this study was to determine if the absolute
albumin level on the first postoperative day was of value in predicting in-hospital complications.
Methods A retrospective study of 200 patients undergoing esophagectomy for malignant disease at St. James Hospital between 1999 and
2005 was performed. Patients who had pre and postoperative (days 1, 3, and 7) serum albumin levels measured were included
in the study. Patients were subdivided into three postoperative albumin categories <20 g/l, 20–25 g/l, >25 g/l. Logistic regression
analysis was performed to calculate the odds of morbidity and mortality according to the day 1 albumin level.
Results Patients with an albumin of less than 20 g/l on the first postoperative day were twice as likely to develop postoperative
complications than those with an albumin of greater than 20 g/l (54 vs 28% respectively, p < 0.011). Correspondingly, these patients also had a significantly higher rate of Adult Respiratory Distress Syndrome (22
vs 5%, p < 0.001), respiratory failure (27 vs 8%, p < 0.01) and in-hospital mortality (27 vs 6% (p < 0.001). On multivariate logistic regression analysis, day 1 albumin level was independently related to postoperative complications
(odds ratios, 0.89: 95%; confidence intervals, 0.83–0.96; p < 0.005). In addition, albumin <20 g/l on the first postoperative day was associated with the need for further surgery and
a return to ICU.
Conclusion Serum albumin concentration on the first postoperative day is a better predictor of surgical outcome than many other preoperative
risk factors. It is a low cost test that may be used as a prognostic tool to detect the risk of adverse surgical outcomes. 相似文献