全文获取类型
收费全文 | 35043篇 |
免费 | 1861篇 |
国内免费 | 99篇 |
专业分类
耳鼻咽喉 | 718篇 |
儿科学 | 1323篇 |
妇产科学 | 1049篇 |
基础医学 | 4025篇 |
口腔科学 | 1274篇 |
临床医学 | 2851篇 |
内科学 | 6491篇 |
皮肤病学 | 728篇 |
神经病学 | 3046篇 |
特种医学 | 1239篇 |
外国民族医学 | 1篇 |
外科学 | 5835篇 |
综合类 | 169篇 |
一般理论 | 10篇 |
预防医学 | 3160篇 |
眼科学 | 859篇 |
药学 | 2275篇 |
中国医学 | 118篇 |
肿瘤学 | 1832篇 |
出版年
2023年 | 361篇 |
2022年 | 356篇 |
2021年 | 730篇 |
2020年 | 530篇 |
2019年 | 660篇 |
2018年 | 1153篇 |
2017年 | 911篇 |
2016年 | 1143篇 |
2015年 | 1066篇 |
2014年 | 1376篇 |
2013年 | 1841篇 |
2012年 | 2237篇 |
2011年 | 2401篇 |
2010年 | 1410篇 |
2009年 | 1009篇 |
2008年 | 1563篇 |
2007年 | 1725篇 |
2006年 | 1513篇 |
2005年 | 1538篇 |
2004年 | 1420篇 |
2003年 | 1339篇 |
2002年 | 1206篇 |
2001年 | 754篇 |
2000年 | 751篇 |
1999年 | 628篇 |
1998年 | 223篇 |
1997年 | 186篇 |
1996年 | 146篇 |
1992年 | 359篇 |
1991年 | 333篇 |
1990年 | 355篇 |
1989年 | 336篇 |
1988年 | 315篇 |
1987年 | 302篇 |
1986年 | 319篇 |
1985年 | 318篇 |
1984年 | 247篇 |
1983年 | 212篇 |
1979年 | 248篇 |
1978年 | 166篇 |
1975年 | 157篇 |
1974年 | 198篇 |
1973年 | 200篇 |
1972年 | 212篇 |
1971年 | 176篇 |
1970年 | 152篇 |
1969年 | 194篇 |
1968年 | 170篇 |
1967年 | 160篇 |
1966年 | 144篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
L Papp A Kollár F Rényi-Vámos T Gy?ngy F Horkay L V Hermes E Moravcsik E Bodor Z Szabolcs Z Szabó 《Orvosi hetilap》1992,133(15):901-908
In Hungary valve replacement is still a major indication for heart surgery in adults. In the Cardiovascular Surgical Clinic of Semmelweis Medical University of Budapest from 1976 to 1990 2435 patients were operated for valve disease. Majority of the cases had single (aortic n = 856, mitral n = 912) or double (aortic + mitral n = 513) valve replacement. Over this 15 years period there have been many alterations in patients characteristics and surgical technique as well. In spite of the increasing mean age of patients the operative mortality has decreased (in the last 5 years period it was 2.7%, 5.5% and 7.9% in the three groups respectively). At the same time the number of patients requiring valve re-replacement or combined valve + coronary procedure has increased. The use of bioprosthetic valves has fallen below 10 percent from the 60--80 percent observed between 1976--1980. The analysis showes excellent surgical results in the field of valve replacement in Hungary. 相似文献
92.
F Gerencsér 《Orvosi hetilap》1992,133(36):2302-2304
93.
94.
Zafer Sinik Turgut Alkibay Oumür Ataoglu Hasan Biri Sinan Sözen Nuri de Niz Uustünol Karaoglan Ibrahim Bozkirli 《International journal of urology》1997,4(6):546-551
Background :
The aim of this study was to examine nuclear p53 overexpression in transitional cell carcinoma of the bladder, adenocarcinoma of the prostate, and renal cell carcinoma.
Methods :
Forty-four pathologic specimens from 39 bladder cancer patients, 41 prostatic adenocarcinoma, and 39 renal cell carcinoma specimens were analyzed immunohistochemically with D07 monoclonal antibody to detect the expression of the mutant p53 gene. Overexpression was said to occur when the number of positively-stained tumor nuclei were≥ 10% in each specimen. p53 overexpression was correlated with the clinical and histopathological features of these cancers.
Results :
Nuclear p53 overexpression occurred in 18.2% of transitional cell bladder cancer specimens, 12.2% of prostate cancer specimens, and 17.9% of renal cell cancer specimens. Statistical analyses showed that grade, vascular invasion, and necrosis in bladder cancer, a high Gleason score in prostate cancer, and the 1-year mortality rate in renal cancer were significantly related with p53 nuclear overexpression (P<0.05).
Conclusion :
Using the D07 monoclonal antibody, nuclear p53 overexpression is relatively uncommon in urologic malignancies, and moderately correlates with several histopathological and clinical features of urologic malignancies. 相似文献
The aim of this study was to examine nuclear p53 overexpression in transitional cell carcinoma of the bladder, adenocarcinoma of the prostate, and renal cell carcinoma.
Methods :
Forty-four pathologic specimens from 39 bladder cancer patients, 41 prostatic adenocarcinoma, and 39 renal cell carcinoma specimens were analyzed immunohistochemically with D07 monoclonal antibody to detect the expression of the mutant p53 gene. Overexpression was said to occur when the number of positively-stained tumor nuclei were≥ 10% in each specimen. p53 overexpression was correlated with the clinical and histopathological features of these cancers.
Results :
Nuclear p53 overexpression occurred in 18.2% of transitional cell bladder cancer specimens, 12.2% of prostate cancer specimens, and 17.9% of renal cell cancer specimens. Statistical analyses showed that grade, vascular invasion, and necrosis in bladder cancer, a high Gleason score in prostate cancer, and the 1-year mortality rate in renal cancer were significantly related with p53 nuclear overexpression (P<0.05).
Conclusion :
Using the D07 monoclonal antibody, nuclear p53 overexpression is relatively uncommon in urologic malignancies, and moderately correlates with several histopathological and clinical features of urologic malignancies. 相似文献
95.
The authors have examined the incidence of intrauterine growth retardation at a country level for the first time both in local and international aspect. Using the nomenclature of NDN-system they have found the frequency of WL-(proportional) retardation 7.95% and that of N-(disproportional) retardation 5.99%. They show incidence of retardation from county to county, as well. Examining the correlation between retardation and perinatal mortality they've stated that while the frequency of still-birth among the average developed and proportionally nutrified fetus is 0.34% and the frequency of perinatal mortality among them is 1.23%, that of the N-retardated newborns is 0.88% and 2.08%, respectively, and that of the WL-retarded is higher than the latter: 2.03% and 3.90% respectively. Regarding the incidence and mortality ratio among the two types of retardation the difference is significant. 相似文献
96.
Water-suppressed 1H magnetic resonance spectra were recorded from two brain regions of psychiatric patients and normal volunteers. The two regions studied were (a) the basal ganglia structures surrounding the anterior horn of the lateral ventricle and (b) the occipital cortex. N-Acetylaspartate (NAA), phosphocreatine-creatine (PCr-Cr), choline and inositol resonances were seen in both regions. Ratios of metabolite peak integrals to PCr-Cr peak integral were calculated for each spectrum. To control for partial volume effects, comparisons between patients and controls were made only from identical regions i.e. basal ganglia vs basal ganglia, and likewise for occipital cortex. Metabolite ratios from the occipital region of patients were similar to those from the occipital region of normal subjects. Bipolar patients being treated with lithium had elevated NAA/PCr-Cr in the basal ganglia region when compared to normals. These patients also demonstrated elevated choline/PCr-Cr and inositol/PCr-Cr ratios in the basal ganglia region. 相似文献
97.
Oguzkan Sürücü Ulrich Sure Sabine Gaetzner Sonja Stahl Ludwig Benes Helmut Bertalanffy Ute Felbor 《Child's nervous system》2006,22(11):1461-1464
Introduction and background A 3-year-old Bosnian girl with a large symptomatic brainstem and multiple supratentorial cavernous angiomas, who underwent neurosurgical treatment, is presented. As multiple cavernomas are more common in familial cases, genetic analyses and neuroradiological imaging were performed in the patient and her parents to see whether there was any evidence for inheritance. This information is important for genetic counseling and provision of medical care for at-risk relatives. Currently, no recommendation is available on how to manage these cases.Results Genetic analyses demonstrated a novel CCM1 frameshift mutation (c.1683_1684insA; p.V562SfsX6) in the child and the asymptomatic 27-year-old mother. Sensitive gradient-echo magnetic resonance imaging of the mother revealed multiple supratentorial lesions, whereas analogous imaging of the father showed no pathological findings.Conclusion This case exemplifies that seemingly sporadic cases with multiple lesions might well be hereditary and that presymptomatic genetic testing of family members may identify relatives for whom clinical and neuroradiological monitoring is indicated. 相似文献
98.
99.
P Hercz P Siklos L Ungár R G Farquharson K Mohári L Kocsár 《European journal of obstetrics, gynecology, and reproductive biology》1987,24(3):189-193
The authors examined the possible role of HPL in the onset of labour. The HPL level of the maternal vein, the umbilical cord vein and artery was compared in vaginal mature (n = 16) and premature (n = 52) deliveries. The HPL concentration was also examined in mature (n = 18) and premature (n = 18) deliveries performed by caesarean section prior to the onset of labour. The results showed that: the serum HPL level in the maternal vein, the umbilical cord vein and artery was lower during the 33rd-36th and the 40th weeks in cases of vaginal delivery compared to elective caesarean section; The artery/vein ratio decreases during labour (A/V X 100 value), indicating that HPL metabolism in the fetus decreases during regular labour pains; The onset of premature labour and delivery was associated with lower HPL levels compared to normal pregnancy. The authors assume that the lower HPL level found in cases of vaginal delivery may be due to reduced placental perfusion, but they do not exclude the possible association of lower HPL concentrations in cases of premature delivery. 相似文献
100.