全文获取类型
收费全文 | 771篇 |
免费 | 70篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 9篇 |
儿科学 | 7篇 |
妇产科学 | 50篇 |
基础医学 | 84篇 |
口腔科学 | 7篇 |
临床医学 | 70篇 |
内科学 | 299篇 |
皮肤病学 | 18篇 |
神经病学 | 47篇 |
特种医学 | 20篇 |
外科学 | 74篇 |
综合类 | 7篇 |
预防医学 | 33篇 |
眼科学 | 9篇 |
药学 | 33篇 |
中国医学 | 2篇 |
肿瘤学 | 82篇 |
出版年
2023年 | 12篇 |
2022年 | 18篇 |
2021年 | 32篇 |
2020年 | 14篇 |
2019年 | 21篇 |
2018年 | 21篇 |
2017年 | 28篇 |
2016年 | 35篇 |
2015年 | 32篇 |
2014年 | 45篇 |
2013年 | 59篇 |
2012年 | 62篇 |
2011年 | 55篇 |
2010年 | 47篇 |
2009年 | 34篇 |
2008年 | 54篇 |
2007年 | 69篇 |
2006年 | 49篇 |
2005年 | 38篇 |
2004年 | 28篇 |
2003年 | 28篇 |
2002年 | 25篇 |
2001年 | 6篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1998年 | 5篇 |
1997年 | 5篇 |
1996年 | 1篇 |
1995年 | 4篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1975年 | 1篇 |
1973年 | 2篇 |
1931年 | 1篇 |
1930年 | 1篇 |
排序方式: 共有851条查询结果,搜索用时 15 毫秒
41.
Yunseon Choi Jun Won Kim Hyejung Cha Kwang Hyub Han Jinsil Seong 《Journal of radiation research》2014,55(1):113-120
This study investigated the prognostic significance of portal vein tumor thrombosis (PVTT) response in hepatocellular carcinoma (HCC) patients treated with localized concurrent chemoradiotherapy (CCRT). We retrospectively analyzed 100 patients treated with CCRT for UICC Stage T2–4N0M0 HCC with PVTT between 2002 and 2011. The radiotherapy (RT) volume included both primary tumor and PVTT, and the median radiation dose was 45 Gy. Treatment response was evaluated for up to 6 months after RT. With respect to PVTT response to treatment, complete response (CR) and partial response (PR) were achieved in 14% and 48% of patients, respectively, yielding an objective response (OR) rate of 62%. PVTT size (≤3cm diameter) was associated with a higher rate of a CR (P = 0.001). The median overall survival (OS) was 11.6 months. Independent prognostic factors for OS were OR of the tumor to RT and a CR of the PVTT. Achieving an OR in both the tumor and the PVTT demonstrated a significant correlation with improved survival (P = 0.002). Progression of intrahepatic metastasis was affected not by CCRT but by the clinical features of the PVTT, particularly the initial PVTT site. PVTT response following CCRT seems prognostically significant. CR of the PVTT was associated with improved survival. Achieving an OR in both the tumor and PVTT was also associated with improved survival. 相似文献
42.
43.
Kae Kawachi Takeshi Sasaki Ayumi Murakami Takashi Ishikawa Ayako Kito Ikuko Ota Daisuke Shimizu Akinori Nozawa Yoji Nagashima Rikuo Machinami Ichiro Aoki 《Pathology, research and practice》2010
This study aimed at evaluating the usefulness of topoisomerase II alpha (TOP2A) for predicting the effect of anthracycline-based neoadjuvant chemotherapy in breast cancer. The TOP2A status was examined using fluorescent in situ hybridization (FISH) in 14 pre-chemotherapeutic breast cancer tissues, and was also assessed by immunohistochemistry (IHC) in 14 pairs of pre- and post-chemotherapeutic breast cancer specimens. TOP2A gene aberration by IHC tended to show a correlation with pathological responses but this was not statistically significant (p=0.060). On the other hand, the low TOP2A/CEP17 ratio correlated with good pathological responses (p=0.012). TOP2A overexpression was not significantly associated with response (p=0.580). Our results thus suggest that the TOP2A/CEP17 ratio may be a useful predictor of the effects of anthracycline-based neoadjuvant chemotherapy in breast cancer. 相似文献
44.
45.
目的 观察白内障超声乳化术后眼前房蛋白浓度的变化。 方法 采用FM 5 0 0型前房蛋白闪辉仪 (LaserFlareMeter ,LFM )对 32例 (42只眼 )白内障超声乳化术前及术后 1、3d ,1、2周的前房蛋白浓度进行测量。 结果 手术后第 1d前房蛋白浓度达最高为 6 2 .3光电符号数·毫秒 -1(pc·ms-1) >术后第 3d 2 7pc·ms-1(P <0 .0 5 )。术后 1周为 8.6 0pc·ms-1、2周为 8.6 3pc·ms-1,基本接近正常 ,2者间差异无显著性 (P >0 .0 5 )。 结论 超声乳化所引起的眼前部血 房水屏障的功能性改变在术后 1周左右基本恢复。 相似文献
46.
Michelle Lampl Juan Pedro Kusanovic Offer Erez Jimmy Espinoza Francesca Gotsch Luis Goncalves Sonia Hassan Ricardo Gomez Jyh Kae Nien Edward A. Frongillo Roberto Romero 《American journal of human biology》2009,21(2):141-150
The past two decades in the United States have seen a 24% rise in spontaneous late preterm delivery (34–36 weeks) of unknown etiology. This study tested the hypothesis that fetal growth was identical prior to spontaneous preterm (n = 221, median gestational age at birth 35.6 weeks) and term (n = 3706) birth among pregnancies followed longitudinally in Santiago, Chile. The hypothesis was not supported: Preterm‐delivered fetuses were significantly larger than their term‐delivered peers by mid‐second trimester in estimated fetal weight, head, limb, and abdominal dimensions, and they followed different growth trajectories. Piecewise regression assessed time‐specific differences in growth rates at 4‐week intervals from 16 weeks. Estimated fetal weight and abdominal circumference growth rates slowed at 20 weeks among the preterm‐delivered, only to match and/or exceed their term‐delivered peers at 24–28 weeks. After an abrupt growth rate decline at 28 weeks, fetuses delivered preterm did so at greater population‐specific sex and age‐adjusted birth weight percentiles than their peers from uncomplicated pregnancies (P < 0.01). Growth rates predicted birth timing: one standard score of estimated fetal weight increased the odds ratio for late preterm birth from 2.8 prior to 23 weeks, to 3.6 (95% confidence interval, 1.82–7.11, P < 0.05) between 23 and 27 weeks. After 27 weeks, increasing size was protective (OR: 0.56, 95% confidence interval, 0.38–0.82, P = 0.003). These data document, for the first time, a distinctive fetal growth pattern across gestation preceding spontaneous late preterm birth, identify the importance of mid‐gestation for alterations in fetal growth, and add perspective on human fetal biological variability. Am. J. Hum. Biol., 2009. © 2008 Wiley‐Liss, Inc. 相似文献
47.
Toxicogenomics of drug-induced hemolytic anemia by analyzing gene expression profiles in the spleen.
48.
Wang AY Sea MM Ip R Law MC Chow KM Lui SF Li PK Woo J 《The American journal of clinical nutrition》2002,76(3):569-576
BACKGROUND: Dialysis patients are at risk of vitamin and mineral deficiencies, not only because of losses during chronic hemodialysis or peritoneal dialysis but also because of low intakes. OBJECTIVE: The objective was to determine the importance of urea clearance (calculated as K(t)/V) and residual renal function (RRF) in predicting micronutrient intakes in a large cohort of patients receiving continuous ambulatory peritoneal dialysis (CAPD). DESIGN: We conducted a survey of dietary intakes in 242 CAPD patients and divided them into 3 groups according to their weekly urea clearance and RRF: WD group (n = 84), a urea clearance >/= 1.7 and a glomerular filtration rate (GFR) >/= 1 mL x min(-1) x 1.73 m(-2); DD group (n = 71), a urea clearance >/= 1.7 and a GFR < 1 mL x min(-1) x 1.73 m(-2); and ID group (n = 87), a urea clearance < 1.7. RESULTS: Most of the patients had intakes of water-soluble vitamins and minerals that were lower than the recommended dietary allowance; most intakes were significantly higher in the WD group than in the DD and ID groups, except those of niacin and calcium. After age, sex, body weight, and the presence of diabetes were controlled for, total weekly urea clearance and the GFR (but not peritoneal dialysis urea clearance) were significantly associated with intakes of vitamins A and C, the B vitamins, and minerals (calcium, phosphate, iron, and zinc). Low intakes of vitamins and minerals with low RRF and urea clearance were the result of reduced overall food intakes, except for thiamine, vitamin B-6, and folic acid, which were deficient in the diet. CONCLUSIONS: Supplementation with most water-soluble vitamins and minerals, including iron and zinc, should be considered in CAPD patients, especially those with low RRF and low urea clearance. The optimal dose needs to be determined. 相似文献
49.
Gomez R Romero R Nien JK Chaiworapongsa T Medina L Kim YM Yoon BH Carstens M Espinoza J Iams JD Gonzalez R 《American journal of obstetrics and gynecology》2005,192(3):678-689
OBJECTIVE: The purpose of this study was to determine whether there was a relationship between sonographic cervical length and the presence of culture-proven microbial invasion of the amniotic cavity in women with preterm labor and intact membranes. STUDY DESIGN: Ultrasonography and amniocentesis were performed in 401 patients admitted with preterm labor (22-35 weeks) and cervical dilatation of < or = 3 cm, as assessed by digital examination. Cervical length was determined by transvaginal ultrasound at admission. Outcome variables were the presence of microbial invasion of the amniotic cavity (defined as a positive amniotic fluid culture) and the occurrence of preterm delivery before 35 weeks. Contingency tables, chi2 test, receiver-operator characteristic (ROC) curves, and logistic regression were used for statistical analysis. RESULTS: The prevalence of microbial invasion of the amniotic cavity was 7% (28/401). Spontaneous preterm delivery (< or = 35 weeks) occurred in 21.4% (82/384) of patients. ROC curve analysis showed a significant relationship between the frequency of microbial invasion of the amniotic cavity and the length of the uterine cervix (area under the curve: 0.77; P < .005). Patients with a cervical length < 15 mm had a higher rate of a positive amniotic fluid culture than patients with a cervical length > or = 15 mm (26.3% [15/57] vs. 3.8% [13/344], respectively; P < .05). Moreover, patients with a short cervix (defined as < 15 mm) were more likely to deliver spontaneously before 35 weeks, 32 weeks, within 7 days, and within 48 hours of admission ( P < .05 for all comparisons). Forty percent of patients (161/401) had a cervical length > or = 30 mm. These patients had a very low risk of microbial invasion of the amniotic cavity (1.9% [3/161]), spontaneous delivery < or = 35 weeks (4.5% [7/154]), < or = 32 weeks (2.6% [2/76]), within 7 days (1.9% [3/154]), and within 48 hours (0% [0/154]) of admission. CONCLUSION: Endovaginal ultrasonographic examination of the uterine cervix in women with preterm labor identifies patients at increased risk for intrauterine infection. 相似文献
50.
A novel mutation of keratin 9 gene (R162P) in a Japanese family with epidermolytic palmoplantar keratoderma 总被引:3,自引:0,他引:3
Epidermolytic palmoplantar keratoderma (EPPK) is an autosomal dominant inherited skin disorder characterized by hyperkeratosis of the skin over the palms and soles. Mutations in keratin 9 gene (KRT9) have been demonstrated in EPPK. In this study, we screened a Japanese family with EPPK for KRT9 mutation by polymerase chain reaction amplification of genomic sequences, followed by heteroduplex analysis and direct nucleotide sequencing. The mutation consisted of a G-to-C transversion at codon 162 in exon 1, which was located in the hot spot of the mutations that have been reported previously (R162Q and R162W). However, the amino acid substitution was proline for arginine (R162P) in the 1A rod domain, the highly conserved helix initiation motif of keratin 9. Our result illustrates the repertoire of KRT9 mutation underlying the occurrence of EPPK in a Japanese family and is an important contribution to the investigation of the genotype/phenotype correlation. 相似文献