全文获取类型
收费全文 | 4344篇 |
免费 | 272篇 |
国内免费 | 76篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 212篇 |
妇产科学 | 66篇 |
基础医学 | 279篇 |
口腔科学 | 74篇 |
临床医学 | 689篇 |
内科学 | 1277篇 |
皮肤病学 | 15篇 |
神经病学 | 111篇 |
特种医学 | 98篇 |
外科学 | 282篇 |
综合类 | 591篇 |
预防医学 | 318篇 |
眼科学 | 63篇 |
药学 | 426篇 |
10篇 | |
中国医学 | 117篇 |
肿瘤学 | 59篇 |
出版年
2024年 | 10篇 |
2023年 | 93篇 |
2022年 | 162篇 |
2021年 | 238篇 |
2020年 | 194篇 |
2019年 | 167篇 |
2018年 | 176篇 |
2017年 | 171篇 |
2016年 | 190篇 |
2015年 | 171篇 |
2014年 | 364篇 |
2013年 | 410篇 |
2012年 | 284篇 |
2011年 | 280篇 |
2010年 | 200篇 |
2009年 | 169篇 |
2008年 | 154篇 |
2007年 | 140篇 |
2006年 | 97篇 |
2005年 | 103篇 |
2004年 | 97篇 |
2003年 | 68篇 |
2002年 | 54篇 |
2001年 | 42篇 |
2000年 | 34篇 |
1999年 | 45篇 |
1998年 | 53篇 |
1997年 | 36篇 |
1996年 | 29篇 |
1995年 | 32篇 |
1994年 | 30篇 |
1993年 | 22篇 |
1992年 | 21篇 |
1991年 | 37篇 |
1990年 | 31篇 |
1989年 | 30篇 |
1988年 | 24篇 |
1987年 | 26篇 |
1986年 | 26篇 |
1985年 | 34篇 |
1984年 | 22篇 |
1983年 | 13篇 |
1982年 | 19篇 |
1981年 | 18篇 |
1980年 | 15篇 |
1979年 | 19篇 |
1978年 | 8篇 |
1977年 | 13篇 |
1976年 | 11篇 |
1971年 | 3篇 |
排序方式: 共有4692条查询结果,搜索用时 0 毫秒
1.
糖化血红蛋白(Hb)A1c是血糖监测的苇要指标,反映检测前2~3个月的平均血糖水平.慢性肾功能衰竭(CRF)患者存在贫血、酸中毒、氧化应激、胰岛素抵抗、血液透析及促红细胞生成素(EPO)的应用等因素,对HbA1c的测定会造成影响.糖化血清蛋白(GSP)反映检测前2~3周的平均血糖水平,仅受血浆蛋白的影响,几乎不受血红蛋白和EPO治疗等以上因素的影响,且对短时间内的血糖变化更为敏感.将GSP作为糖尿病肾功能衰竭患者血糖监测指标可能比HbA1c更理想. 相似文献
2.
Adjuvant radiotherapy in carcinomas of the uterine cervix: the prognostic value of hemoglobin levels
K. Münstedt P. Johnson M.K. Bohlmann M. Zygmunt R. von Georgi† & H. Vahrson 《International journal of gynecological cancer》2005,15(2):285-291
Anemia has been associated with a poorer treatment response and reduced survival in women undergoing primary radiotherapy (RT) or radiochemotherapy for advanced cervical carcinoma. This study aimed to determine the influence of anemia on outcome in patients with cervical carcinoma undergoing adjuvant RT. Medical records were reviewed for 183 cervical cancer patients who had received adjuvant RT because of risk factors after radical surgery (n= 109) or inadequate primary surgery (simple hysterectomy; n= 74). Kaplan-Meier and Cox regression analyses were used to study hemoglobin levels before and during adjuvant RT in relation to recurrence-free and overall survival. Hemoglobin values > or =11 g/dL were considered normal, while those <11 g/dL indicated anemia. Hemoglobin levels before RT influenced significantly overall survival and recurrence-free survival across the whole group (overall survival--log rank(all patients)= 7.5; df = 1; P= 0.006). However, subgroup analysis showed that the observed difference was mainly due to the group of women who had undergone inadequate primary surgery (overall survival--log rank(inadequate surgery)= 10.8; df = 1; P= 0.001). Multifactorial regression analyses comparing hemoglobin before RT with grading and tumor stage confirmed the prognostic value of hemoglobin values. Maintaining normal hemoglobin values before and during adjuvant RT seems to be important, especially in patients who have had inappropriate simple hysterectomy, which may resemble a therapeutic situation. 相似文献
3.
Two hundred and thirty pregnancies were studied in 196 diabetic women. Seven women with babies found to have major malformations had a higher median first trimester haemoglobin A1 (12.9%) than the median HbA1 (10.8%) in those with normal babies (p = 0.06). No relationship was found between the occurrence of minor malformations and first trimester maternal haemoglobin A1. Two of the seven congenital malformations were diagnosed antenatally at a time when therapeutic abortion could be offered. Expert antenatal ultrasound scanning should be offered to all pregnant diabetic women as poor glycaemic control at the time of conception and organogenesis, as evidenced by raised first trimester HbA1, predisposes to congenital malformation. 相似文献
4.
本文用Balb/c小鼠观察了巯亚硝基蛋白在体内产生一氧化氮的量效关系,结果发现,SNO-Hb在体内可剂量信赖地产生NO。 相似文献
5.
比较了几种拆分剂分离猪血红细胞中血红蛋白的效果,其中羧甲基淀粉(CMS)得到最佳效果。脱色球蛋白的功能性实验证实其有良好的起泡和乳化性能,氨基酸分析显示其赖氨酸和组氨酸的含量较高,适合作为婴儿的营养强化剂。 相似文献
6.
Diabetic control after total pancreatectomy 总被引:3,自引:0,他引:3
BACKGROUND: Diabetes after total pancreatectomy is commonly described as 'brittle' with most series reporting outcomes after resection for pancreatitis alone. The aim of this study was to determine glycaemic control in patients resected for benign and malignant disease. METHODS: A retrospective analysis of all patients undergoing total pancreatectomy (1989-2003) from a single institution was done. Data of diabetic control were obtained from case notes, general practitioners and telephonic consultation. Comparison was made against a matched type 1 diabetic population. RESULTS: Forty-seven patients with a median age of 59 years (range 17-85 years) and median follow-up of 50 months (range 5-136 months) were identified. Thirty-five underwent primary resection with 11 receiving completion procedures. Thirty were for malignancy (19 deceased) and 17 for benign/indeterminate histology (2 deceased). Thirty-three patients were available for detailed follow-up. There was no significant difference between median HbA(1c) of the study group and the control (8.2% versus 8.1%). The majority of patients reported diabetic control and daily performance as excellent or good. Resection for pancreatitis gave poorer subjective control (p < 0.05) than those resected for malignancy. Two patients required in-patient treatment for diabetic complications, with no deaths related to diabetes observed. CONCLUSION: Diabetes after total pancreatectomy is not necessarily associated with poor glycaemic control and in the majority results in equivalent biochemical control compared to a normal type 1 diabetic population. 相似文献
7.
Abstract: The effects of pyridoxalated hemoglobin polyoxyethylene conjugate (PHP) and stroma-free hemoglobin (SFH) on vascular responsiveness to various vasoactive substances were examined in isolated perfused rat kidneys. The kidneys isolated from rats were perfused with 6% PHP, 6% SFH, and 6% hydroxyethylstarch (HES) solution at a constant flow rate. Vascular responsiveness to acetylcholine (ACh), nitroglycerin (NG), norepinephrine (NE), and angiotensin-II (ANG-II) was examined by measuring the perfusion pressure (PP). Effects of inhibition of endothelium-derived relaxing factor (EDRF) by NG -monomethyl L-arginine (L-NMMA) on NE-induced and ANG-II-induced renal vascular responses were examined. ACh and NG induced a dose-dependent decrease in perfusion pressure (PP) in all groups. NE and ANG-II induced an increase in PP in all groups, but NE-induced and ANG-II-induced responses in the PHP-perfused and SFH-perfused groups were significantly larger than those in the HES-perfused group. L-NMMA did not alter vascular responsiveness to NE and ANG-II. These results indicate that PHP and SFH do not inhibit EDRF induced by ACh, but hemoglobin moiety per se does augment the vascular responsiveness to NE and ANG-II in the isolated perfused rat kidney. 相似文献
8.
I. V. Smirnov A. A. Khachatur'yan 《Bulletin of experimental biology and medicine》1991,112(5):1601-1603
All-Union Hematology Research Center, Moscow. (Presented by Academician of the Academy of Medical Sciences of the USSR A. I. Vorob'ev.) Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 112, No. 11, pp. 500–501, November, 1991. 相似文献
9.
10.
We present our experience with twenty children with insulin dependent diabetes mellitus admitted during the past 2 1/2 years.
Sixteen patients were admited with acute onset of ketoacidosis while four were having gradual onset. Active and symptomatic
treatment was started in all diabetic ketoacidotic patients. One patient died during the acute stage. Eleven patients were
followed for 3–6 months or more. Glycosylated hemoglobin was considered as a criteria for control. Three had good control,
two fair and six poor control; six developed diabetic ketoacidosis and three developed hypoglycemia 相似文献