全文获取类型
收费全文 | 11378篇 |
免费 | 729篇 |
国内免费 | 66篇 |
专业分类
耳鼻咽喉 | 63篇 |
儿科学 | 246篇 |
妇产科学 | 291篇 |
基础医学 | 1600篇 |
口腔科学 | 398篇 |
临床医学 | 1058篇 |
内科学 | 2276篇 |
皮肤病学 | 198篇 |
神经病学 | 1445篇 |
特种医学 | 334篇 |
外科学 | 1295篇 |
综合类 | 28篇 |
现状与发展 | 1篇 |
一般理论 | 8篇 |
预防医学 | 1032篇 |
眼科学 | 123篇 |
药学 | 730篇 |
3篇 | |
中国医学 | 49篇 |
肿瘤学 | 995篇 |
出版年
2024年 | 58篇 |
2023年 | 139篇 |
2022年 | 254篇 |
2021年 | 440篇 |
2020年 | 277篇 |
2019年 | 397篇 |
2018年 | 432篇 |
2017年 | 348篇 |
2016年 | 401篇 |
2015年 | 378篇 |
2014年 | 466篇 |
2013年 | 611篇 |
2012年 | 889篇 |
2011年 | 864篇 |
2010年 | 461篇 |
2009年 | 431篇 |
2008年 | 688篇 |
2007年 | 664篇 |
2006年 | 649篇 |
2005年 | 586篇 |
2004年 | 557篇 |
2003年 | 491篇 |
2002年 | 408篇 |
2001年 | 150篇 |
2000年 | 112篇 |
1999年 | 129篇 |
1998年 | 65篇 |
1997年 | 73篇 |
1996年 | 43篇 |
1995年 | 35篇 |
1994年 | 35篇 |
1993年 | 28篇 |
1992年 | 63篇 |
1991年 | 72篇 |
1990年 | 43篇 |
1989年 | 62篇 |
1988年 | 51篇 |
1987年 | 42篇 |
1986年 | 42篇 |
1985年 | 40篇 |
1984年 | 31篇 |
1983年 | 18篇 |
1982年 | 19篇 |
1981年 | 17篇 |
1979年 | 17篇 |
1978年 | 10篇 |
1977年 | 13篇 |
1976年 | 9篇 |
1974年 | 12篇 |
1971年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
Fiorentini G Rossi S Bonechi F Vaira M De Simone M Dentico P Bernardeschi P Cantore M Guadagni S 《Journal of chemotherapy (Florence, Italy)》2004,16(3):293-297
Neuroendocrine tumors, particularly those of gastrointestinal tract origin, have a predisposition for metastasizing to the liver, causing parenchymal substitution and paraneoplastic syndrome. Lipiodol embolization combined with anticancer drugs is a recent tool in regional therapy. It has been proven that chemoembolization reduces tumor bulk and hormone levels, and that it palliates the symptoms of many patients with liver-dominant neuroendocrine metastases. Beginning in December 1988, ten patients with unresectable and chemotherapy-refractory liver metastatic neuroendocrine tumors were treated with chemoembolization based on a mixture of lipiodol, mitomycin, cisplatin, epirubicin, followed by gelfoam powder and contrast media. Toxicity encountered included: upper right quadrant pain requiring narcotics, elevation of lactate dehydrogenase, alkaline phosphatase, and transaminases. One patient had liver abscess and persistent fever for 2 weeks. We obtained two complete remissions lasting 12 and 34 months and 5 partial remissions. The median survival was 22 months. Four patients had urinary elevation of 5-hydroxyindolacetic acid (5-HIAA). They showed more than a 75% decrease in urinary secretion after treatment. In a patient with transplanted liver we noticed a partial response lasting 7 months. We conclude that chemoembolization will improve the clinical condition of a significant percentage of patients with liver metastases, that future therapy of carcinoid tumors will be based on specific tumor biology and that treatment will be customized for each individual patient combining the use of cytoreductive procedures including radiofrequency ablation, laser treatment and chemoembolization. 相似文献
62.
Menada MV Remorgida V Abbamonte LH Fulcheri E Ragni N Ferrero S 《Fertility and sterility》2008,89(3):699-700
This prospective study evaluated the efficacy of transvaginal ultrasonography combined with water-contrast in the rectum (RWC-TVS) in the diagnosis of rectal infiltration in 35 women with rectovaginal endometriosis; ultrasonographic findings were compared with surgery and histology. The sensitivity of RWC-TVS in identifying rectal infiltration reaching at least the muscular layer was 100%, the specificity was 85.7%, the positive predictive value was 91.3%, and the negative predictive value was 100%. In 4 of 5 (80.0%) nodules reaching the submucosa, the depth of infiltration was underestimated by RWC-TVS. The RWC-TVS reliably determined the largest diameter of the endometriotic nodules and was well tolerated by the patients. 相似文献
63.
64.
Cioffi G Dal Piaz F Vassallo A Venturella F De Caprariis P De Simone F De Tommasi N 《Journal of natural products》2008,71(6):1000-1004
Eight new oleanane saponins (1- 8) together with four know saponins (9-12) were isolated from the aerial parts of Meryta denhamii. Their structures were elucidated by 1D and 2D NMR experiments including 1D TOCSY, DQF-COSY, ROESY, HSQC, and HMBC spectroscopy, as well as ESIMS analysis. The antiproliferative activity of all compounds was evaluated using three murine and human cancer cell lines: J774.A1, HEK-293, and WEHI-164. 相似文献
65.
Grance SR Teixeira MA Leite RS Guimarães EB de Siqueira JM de Oliveira Filiu WF de Souza Vasconcelos SB do Carmo Vieira M 《Journal of ethnopharmacology》2008,117(1):28-33
AIM OF THE STUDY: This investigation evaluated the effect of a hydroethanolic extract of Baccharis trimera on pregnant Wistar rats, once the plant is well-known consumed in pregnancy and little is known on its potentially toxic effects on pregnant women. MATERIAL AND METHODS: Thirty-five female rats were distributed into three groups. Those in treatments 1 and 2 were given 8.4 mg/kg of the extract orally from gestational day (GD) 1 to 19 and from GD 6 to 15, respectively, whereas those in the control group received distilled water orally from GD 1 to 19. Body weights were recorded on GD 1, 6, 15, and 20. On GD 20 animals were anesthetized, blood samples were collected and maternal livers, kidneys, and spleens were weighed and processed for histological studies. RESULTS: No clinical signs of maternal toxicity and no changes in hematological parameters were observed. Urea levels and kidney weights differed significantly between animals receiving treatment 1 and controls. Histopathological alterations were found in kidneys and livers in both treatment groups. CONCLUSIONS: The hydroethanolic extract of Baccharis trimera administered to pregnant rats at 8.4 mg/kg was toxic to maternal kidney and liver cells, although such alterations are reversible once administration is discontinued. 相似文献
66.
Deep dyspareunia: causes, treatments, and results 总被引:1,自引:0,他引:1
PURPOSE OF REVIEW: We critically review the causes and treatments of deep dyspareunia. RECENT FINDINGS: Endometriosis, pelvic congestion syndrome, and interstitial cystitis have been associated with deep dyspareunia. Although medical therapies may improve deep dyspareunia in women with endometriosis, laparoscopic excision of deep endometriotic lesions has been demonstrated to improve not only deep dyspareunia but also the quality of sex life. Deep dyspareunia related to the presence of pelvic congestion syndrome should be treated by pelvic vein embolization. Intravesical therapy may be effective in treating deep dyspareunia in women with interstitial cystitis. It remains unclear whether uterine myomas and adenomyosis are causes of deep dyspareunia. SUMMARY: Treatment of deep dyspareunia should be mainly directed to causative factors; however, clinicians should keep in mind that secondary sexual dysfunction can arise from organic pelvic pathology. 相似文献
67.
68.
Pretta S Remorgida V Abbamonte LH Anserini P Ragni N Del Sette M Gandolfo C Ferrero S 《European journal of obstetrics, gynecology, and reproductive biology》2007,132(2):226-231
OBJECTIVE: This study aims to determine whether women with endometriosis have greater subclinical atherosclerosis than the general population. STUDY DESIGN: This case-control study included 66 women with endometriosis and 66 controls matched for age and body mass index. All subjects were >or=35 years old. Exclusion criteria were obesity, diabetes, hypertension, hyperlipidemia, renal or metabolic diseases. Before laparoscopy, all patients underwent a measurement of intima-media thickness (IMT) and distensibility coefficient (DC) on the common carotid artery. In addition, blood samples were taken to determine the levels of lipids, fibrinogen, C-reactive protein, homocysteine, fasting glycemia, antithrombin III, plasminogen, protein C, protein S, and activated protein C resistance. RESULTS: All the biochemical parameters evaluated had similar levels in the two study groups. IMT was similar in women with endometriosis and in controls both on left (p=0.330) and right (p=0.648) carotid artery. Similarly, no significant difference was observed in the DC between women with endometriosis and controls both on left (p=0.539) and right (p=0.178) carotid artery. No significant difference was observed in IMT and DC between women with mild and severe endometriosis. CONCLUSION: Women with endometriosis do not have more subclinical atherosclerosis than the general population. 相似文献
69.
Lorenzo Franchi Alessandro Vichi Patrizia Marti Flavio Lampus Simone Guercio Annamaria Recupero Veronica Giuntini Cecilia Goracci 《Materials》2022,15(11)
In order to improve fit and comfort, a maxillary protraction facemask customized to the patient’s anatomy was produced by means of 3D face scanning, digital design and additive manufacturing. An 8-year-old patient in need of early treatment for the Class III malocclusion received a rapid palatal expander and a Petit-type facemask, whose components were digitally designed on a 3D scan of the patient’s face. For face scanning, the iPad Pro 2018 tablet (Apple, Cupertino, CA, USA) with the Bellus3D DentalPro application (Bellus3D, Campbell, CA, USA) was used. Facemask components were modelled with 3D Blender software. The rests were 3D printed in BioMed Clear biocompatible resin (Formlabs, Somerville, MA, USA), and the bar in stainless steel. For greater comfort, the internal surface of the rests was lined with a polymer gel pad (Silipos, Niagara Falls, NY, USA). The manufacturing procedure of the customized facemask is patented. The patient wore the facemask at night for a period of 9 months. The patient’s experience was evaluated with a questionnaire at 1 week, 3, 6, and 10 months of treatment. The customized facemask was well accepted by the patient and obtained the expected treatment outcome. Furthermore, 3D face scanning, 3D modelling and 3D printing allow for the manufacturing of customized facemasks with improved fit and comfort, favoring patient compliance and treatment success. 相似文献
70.
Simone Perna Clara Gasparri Cinzia Ferraris Gaetan Claude Barrile Alessandro Cavioni Francesca Mansueto Zaira Patelli Gabriella Peroni Alice Tartara Marco Zese Mariangela Rondanelli 《Nutrients》2022,14(12)
Background: SARC-F is a simple sarcopenia screening tool. This study aimed to examine the validity of the Italian version of SARC-F. Methods: A total of 97 elderly individuals (37/60 males/females, 65 years and older) who met the study’s selection criteria were included. SARC-F was translated into the Italian language in a culturally responsive manner. The total score was calculated by adding the scores on the five items. The participants were divided into two groups according to the total score (SARC-F < 4 vs. SARC-F ≥ 4), and their associations with various factors (handgrip test, chair stand test, and Skeletal Muscle Index assessed by DXA) have been examined by gender. In addition, the tool’s validity was analyzed by comparing it with different international working group diagnostic criteria for sarcopenia. Results: The total prevalence of sarcopenia according to the SARC-F was 14.2% and, specifically, 12.8% among men and 14.3% in women. The sensitivity of the SARC-F was (male (M): 11–50% and female (F): 22–36%) medium-low compared with the European, international, and Asian criteria of sarcopenia; however, SARC-F showed a high specificity (M: 77.3–100% and F: 79.5–100%) and a moderate Cronbach’s alpha coefficient of (0.669 (CI95%: 0.358–0.830). The participants in the SARC-F ≥ 4 group had poorer handgrip for EWGSOP2 (p < 0.001) and chair stand (p < 0.001) than the participants in the SARC-F < 4 group. Conclusions: The Italian language version of SARC-F showed high specificity, moderate reliability, and good associations with other predictive tests. The Italian version of SARC-F appears to be a useful screening tool for the diagnosis of sarcopenia in Italian elderly populations. 相似文献