全文获取类型
收费全文 | 20342篇 |
免费 | 1564篇 |
国内免费 | 40篇 |
专业分类
耳鼻咽喉 | 162篇 |
儿科学 | 909篇 |
妇产科学 | 698篇 |
基础医学 | 2530篇 |
口腔科学 | 324篇 |
临床医学 | 2298篇 |
内科学 | 3758篇 |
皮肤病学 | 376篇 |
神经病学 | 2220篇 |
特种医学 | 583篇 |
外国民族医学 | 7篇 |
外科学 | 2135篇 |
综合类 | 213篇 |
一般理论 | 12篇 |
预防医学 | 2590篇 |
眼科学 | 282篇 |
药学 | 1161篇 |
1篇 | |
中国医学 | 37篇 |
肿瘤学 | 1650篇 |
出版年
2023年 | 201篇 |
2022年 | 353篇 |
2021年 | 702篇 |
2020年 | 448篇 |
2019年 | 679篇 |
2018年 | 816篇 |
2017年 | 580篇 |
2016年 | 554篇 |
2015年 | 607篇 |
2014年 | 825篇 |
2013年 | 1098篇 |
2012年 | 1589篇 |
2011年 | 1726篇 |
2010年 | 882篇 |
2009年 | 761篇 |
2008年 | 1167篇 |
2007年 | 1193篇 |
2006年 | 1110篇 |
2005年 | 1030篇 |
2004年 | 933篇 |
2003年 | 803篇 |
2002年 | 731篇 |
2001年 | 212篇 |
2000年 | 194篇 |
1999年 | 196篇 |
1998年 | 119篇 |
1997年 | 119篇 |
1996年 | 83篇 |
1995年 | 60篇 |
1994年 | 67篇 |
1993年 | 57篇 |
1992年 | 136篇 |
1991年 | 113篇 |
1990年 | 127篇 |
1989年 | 113篇 |
1988年 | 117篇 |
1987年 | 116篇 |
1986年 | 105篇 |
1985年 | 106篇 |
1984年 | 88篇 |
1983年 | 79篇 |
1982年 | 51篇 |
1980年 | 51篇 |
1979年 | 69篇 |
1978年 | 62篇 |
1976年 | 50篇 |
1975年 | 53篇 |
1974年 | 58篇 |
1973年 | 74篇 |
1972年 | 84篇 |
排序方式: 共有10000条查询结果,搜索用时 12 毫秒
231.
232.
Fejzo MS Ingles SA Wilson M Wang W MacGibbon K Romero R Goodwin TM 《European journal of obstetrics, gynecology, and reproductive biology》2008,141(1):13-17
Objective
The goal of this study was to determine the prevalence of severe nausea and vomiting of pregnancy/hyperemesis gravidarum among relatives of affected individuals.Study design
Family history data were obtained on 1224 self-reported cases of hyperemesis gravidarum. Cases completed an online survey administered by the Hyperemesis Education and Research Foundation between 2003 and 2006.Results
Approximately 28% of cases reported their mother had severe nausea and vomiting or hyperemesis gravidarum while pregnant with them. Of the 721 sisters with a pregnancy history, 137 (19%) had hyperemesis gravidarum. Among the most severe cases, those requiring total parenteral nutrition or nasogastric feeding tube, the proportion of affected sisters was even higher, 49/198 (25%). Nine percent of cases reported having at least two affected relatives including sister(s), mother, grandmother, daughters, aunt(s), and cousin(s).Conclusion
There is a high prevalence of severe nausea and vomiting of pregnancy/hyperemesis gravidarum among relatives of hyperemesis gravidarum cases in this study population. Because the incidence of hyperemesis gravidarum is most commonly reported to be 0.5%, this study provides strong but preliminary evidence for a genetic component to extreme nausea and vomiting of pregnancy. 相似文献233.
234.
The authors compare perspectives of intimate partner violence (IPV) survivors and emergency department (ED) nurses on types of social support IPV victims need at different stages of readiness to disclose and leave a relationship. Qualitative interviews (16 IPV survivors, 10 ED nurses) center on women's responses to vignettes that illustrate different stages of readiness. Survivors mention fear as a barrier for action, whereas nurses are more likely to say that the woman is in denial. Survivors emphasize emotional support and respect, whereas nurses emphasize informational and instrumental support. IPV victims desire appropriate, respectful responses by nurses, suitable to their stage of readiness. Nurses need more insight into women's decisions to disclose and leave a relationship and skills to provide emotional support. 相似文献
235.
OBJECTIVE: Brain metastasis from uterine cancer is a rare event. Consequently, the optimal management strategy is not defined. We reviewed our institution's experience with brain metastasis from endometrial cancer along with the extant medical literature to develop management recommendations. METHODS: Twenty patients with CNS metastasis were identified. Information regarding symptoms, treatment, and survival was collected. The Kaplan-Meier method was used to compare survival data. RESULTS: The incidence of CNS metastasis was 0.97%. Median patient age at initial diagnosis of endometrial cancer was 62.0 years and 64.0 years at diagnosis of brain metastasis. Most patients initially presented with advanced FIGO stage: 9 stage IVB, 4 stage IIIC, 4 stage IIIA, 2 stage IB, and 1 stage IA. The median interval from diagnosis of endometrial cancer to diagnosis of brain metastasis was 11.5 months (range 0.6-73.6). Median survival after diagnosis of brain metastasis was 2.0 months (range 0.1-39.2). Improved survival was seen in patients treated with multimodal therapy compared to patients who only received whole brain radiotherapy (WBRT) (p=0.0001) or compared to patients who received no treatment (p=0.009). No difference in survival was seen between patients treated with WBRT versus no therapy. The survival advantage associated with multimodal therapy was also supported by case reports and case series in the literature. CONCLUSIONS: Based upon the data presented along with the medical literature, multimodal therapy appears to improve the survival of patients with CNS metastasis from uterine cancer. 相似文献
236.
Chan JK Sugiyama V Pham H Gu M Rutgers J Osann K Cheung MK Berman ML Disaia PJ 《Gynecologic oncology》2007,104(3):636-641
OBJECTIVES: To determine the importance of margin status and other prognostic factors associated with the recurrence and survival of patients with squamous cell vulvar carcinoma. METHODS: Data were analyzed using Kaplan-Meier methods and Cox proportional hazards regression. All slides were re-reviewed by two gynecologic pathologists. RESULTS: Ninety patients (median age: 69) were treated for vulvar carcinoma from 1984 to 2002, including 28 FIGO stage I, 20 stage II, 26 stage III and 16 with stage IV disease. Sixty-three (70%) patients underwent complete radical vulvectomies and 27 (30%) had modified radical vulvectomies. Nineteen (20%) patients received adjuvant radiotherapy. Five-year disease-specific survival rates were 100%, 100%, 86% and 29% for stages I-IV, respectively. None of the 30 patients with a pathologic margin distance >8 mm had local recurrence. Of the 53 women with tumor-free pathologic margin of <8 mm, 12 (23%) had a local recurrence. Moreover, women with >2 positive groin nodes had significantly higher recurrence risk compared to those with <2 metastatic groin nodes (p<0.001). On multivariate analysis, positive groin nodes and margin distance were important prognostic factors for recurrence. Moreover, stage, tumor size, margin distance, and depth of invasion were significant independent predictors for disease-specific survival. The median follow-up was 58 months (range: 2-188). CONCLUSIONS: Pathologic margin distance is an important predictor of local vulvar recurrence. Our data suggest that a > or =8-mm pathologic margin clearance leads to a high rate of loco-regional control. 相似文献
237.
Freerksen N Betancourt A Maul H Wentz M Orise P Günter HH Sohn C Vedernikov Y Saade G Garfield R 《European journal of obstetrics, gynecology, and reproductive biology》2007,130(1):51-59
OBJECTIVE: To study if spontaneous contractions augmented by proteinase-activated receptor-2 (PAR-2)-activating peptide serine-leucine-isoleucine-glycine-arginine-leucine (SLIGRL) involve coactivation of membrane chemoceptors and are associated with expression of PAR-2 mRNA in non-pregnant and pregnant rat myometrium. MATERIALS AND METHODS: Non-pregnant, mid-pregnant, and late pregnant rat uterine horn and small intestine segments were snap-frozen in liquid nitrogen to determine PAR-2 mRNA levels by real time polymerase chain reaction (PCR). Uterine rings were used for isometric tension recording. Effect of SLIGRL (0.1 mM) on spontaneous contractions before and after exposure to ibuprofen (cyclooxygenase inhibitor, 1.0 microM), SQ-29548 (thromboxane A(2) receptor inhibitor, 1.0 microM), ketotifen (histamine 1 receptor inhibitor, 10 microM), WEB-2170BS (platelet-activating factor (PAF) receptor inhibitor, 10 microM), atropine (muscarinic receptor inhibitor, 0.1 microM), or ketanserin (serotonin receptor inhibitor, 10 microM) were compared. Paired t-test and one-way ANOVA followed by Dunnett's or Newman-Keuls post hoc tests were used for statistical analysis when appropriate. SIGNIFICANCE: P<0.05. RESULTS: The agents did not significantly affect time-associated decay in spontaneous contractile activity in any group of the tissues. Activation of spontaneous contractions induced by SLIGRL in non-pregnant rat myometrium did not involve coactivation of membrane chemoceptors, while in mid-pregnant rat myometrium coactivation of prostanoid, histamine, and serotonin receptors and in late pregnant rat myometrium coactivation of thromboxane receptors was noted. Expression of PAR-2 mRNA was similar in non-pregnant, mid-pregnant, and late pregnant rat myometrium. CONCLUSIONS: Expression of PAR-2 in rat myometrium is not dependent on gestational age. Stimulation of PAR-2 is associated with production/release of cyclooxygenase pathway product(s) activating thromboxane/prostaglandin H2 receptors, partial involvement of histamine H1 receptors and serotonin receptors in midpregnancy and thromboxane A2/prostaglandin H2 receptors in late pregnancy. 相似文献
238.
Leath CA Huh WK Hyde J Cohn DE Resnick KE Taylor NP Powell MA Mutch DG Bradley WH Geller MA Argenta PA Gold MA 《Gynecologic oncology》2007,105(3):630-634
OBJECTIVE: To compare the clinical behavior and outcomes of low- and high-grade endometrial stromal sarcomas (LGESS and HGESS), respectively. METHODS: Patients with endometrial stromal sarcoma from five different institutions were identified and reviewed for clinicopathologic variables, surgical management and outcomes. Statistical calculations including Chi-square, t-test and survival using the Kaplan-Meier method with the log rank test were performed. RESULTS: One hundred and five patients were identified with 72 having LGESS, 31 with HGESS and 2 having unclassified tumors. The mean age was 50 years for patients with LGESS and 64 years for those with HGESS (p<0.0001). In patients with LGESS, 68% (49 patients) had disease confined to the uterine corpus or cervix compared to 39% (12 patients) in HGESS (p=0.002). The median overall survival was 53 months for HGESS and had not yet been reached in LGESS with 87.8% alive at 80 months (p<0.0001). In HGESS patients with extrauterine disease, the presence of residual disease greater than 2 cm had a significant effect on median survival. Median survival was 52 months for those who underwent optimal cytoreduction versus 2 months for those with suboptimal residual disease (p=0.007). The impact of cytoreduction was not seen in LGESS patients with extrauterine disease with 82.1% alive at 78 months. CONCLUSIONS: Low-grade and high-grade endometrial stromal sarcomas represent two distinct clinical entities and should be treated as such. Survival in patients with high-grade tumors appears to be related to amount of residual disease at the completion of initial surgery and would suggest the need for aggressive cytoreduction. The role of surgical staging and optimal adjuvant therapy remains unclear. 相似文献
239.
Habte HH Kotwal GJ Lotz ZE Tyler MG Abrahams M Rodriques J Kahn D Mall AS 《Neonatology》2007,92(2):96-104
Human breast milk is known to contain numerous biologically active components which protect breast fed infants against microbes, viruses, and toxins. The purpose of this study was to purify and characterize the breast milk mucin and determine its anti-poxvirus activity. In this study human milk mucin, free of contaminant protein and of sufficient quantity for further analysis, was isolated and purified by Sepharose CL-4B gel filtration and cesiumchloride density-gradient centrifugation. Based on the criteria of size and appearance of the bands and their electrophoretic mobility on sodium dodecyl sulfate polyacrylamide-gel electrophoresis, Western blotting together with the amino acid analysis, it is very likely that the human breast milk mucin is MUC1. It was shown that this breast milk mucin inhibits poxvirus activity by 100% using an inhibition assay with a viral concentration of 2.4 million plaque-forming units/ml. As the milk mucin seems to aggregate poxviruses prior to their entry into host cells, it is possible that this mucin may also inhibit other enveloped viruses such as HIV from entry into host cells. 相似文献
240.