首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   257篇
  免费   17篇
儿科学   3篇
妇产科学   3篇
基础医学   8篇
口腔科学   1篇
临床医学   20篇
内科学   43篇
皮肤病学   2篇
神经病学   34篇
特种医学   2篇
外科学   47篇
综合类   4篇
一般理论   1篇
预防医学   27篇
药学   28篇
肿瘤学   51篇
  2023年   2篇
  2022年   1篇
  2021年   4篇
  2020年   8篇
  2019年   4篇
  2018年   8篇
  2017年   2篇
  2016年   2篇
  2015年   2篇
  2014年   10篇
  2013年   16篇
  2012年   18篇
  2011年   21篇
  2010年   7篇
  2009年   7篇
  2008年   11篇
  2007年   21篇
  2006年   14篇
  2005年   14篇
  2004年   7篇
  2003年   6篇
  2002年   9篇
  2001年   4篇
  2000年   14篇
  1999年   6篇
  1998年   2篇
  1997年   2篇
  1996年   1篇
  1995年   3篇
  1994年   1篇
  1993年   1篇
  1992年   9篇
  1991年   2篇
  1990年   3篇
  1989年   7篇
  1988年   1篇
  1987年   8篇
  1986年   3篇
  1985年   2篇
  1984年   3篇
  1983年   2篇
  1981年   1篇
  1980年   1篇
  1978年   1篇
  1976年   1篇
  1972年   1篇
  1965年   1篇
排序方式: 共有274条查询结果,搜索用时 15 毫秒
21.
22.
23.
The inv(8)(p11q13) chromosomal abnormality, described in acute myeloid leukaemias (AML), fuses the histone acetyl-transferase (HAT) MYST3 (MOZ) gene with another HAT gene, NCOA2 (TIF2). We generated a transgenic zebrafish in which the MYST3/NCOA2 fusion gene was expressed under control of the spi1 promoter. An AML developed in 2 of 180 MYST3/NCOA2-EGFP-expressing embryos, 14 and 26 months after injection of the fusion gene in a one-cell embryo, respectively. This leukaemia was characterised by an extensive invasion of kidneys by myeloid blast cells. This model, which is the first zebrafish model of AML, demonstrates the oncogenic potency of MYST3/NCOA2 fusion gene.  相似文献   
24.
The neuroendocrine effects of the 5-HT receptor agonist, sumatriptan (6 mg subcutaneously), were studied in 11 healthy male subjects using a placebo-controlled, cross-over design. Compared to placebo, sumatriptan significantly lowered levels of plasma prolactin but increased those of plasma growth hormone. There was no effect on plasma cortisol concentrations. The neuroendocrine effects of sumatriptan differ from those of previously described 5-HT-receptor agonists, and may be a consequence of selective activation of 5-HT1D or 5-HT1B receptors. However, the present data cannot exclude the possibility that the neuroendocrine changes reflect non-specific stress responses or changes in pituitary blood flow.  相似文献   
25.
Our group have described a group of patients with primary aldosteronism which is characterized by significantly decreased intralymphocyte ionized magnesium concentration. Some models of experimental hyperaldosteronism are characterized by cardiovascular fibrosis but despite this fact the link between a negative magnesium balance and fibrosis is lacking. Consequently, to shed some light on the relationships between magnesium and tissue fibrosis we tested the in vitro effects of incubating human fibroblasts in low magnesium medium on mRNA collagen I and III gene expression by northern blot analysis. Both collagen I and III mRNA gene expression were increased by magnesium deprivation. The increase in collagen expression was similar for both collagen I and III. These data are in favour of a potential link between magnesium homeostasis and collagen synthesis. A physiopathologic mechanism linking magnesium homeostasis to the state of collagen turnover may have important clinical correlates such as cardiac remodelling in congestive heart failure.  相似文献   
26.
27.
28.
The increased metabolic and respiratory demand during naloxone recovery from opioid-based anesthesia could be related to the return of thermoregulation in hypothermic patients and thus be avoided by preventing intraoperative hypothermia. In this study, we measured O2 uptake (VO2) during naloxone-induced recovery in two groups of patients to determine the effect of intraoperative heat loss on postoperative VO2 changes. In seven patients, intraoperative hypothermia was prevented (normothermic group), whereas hypothermia was allowed to develop in seven other patients (hypothermic group). Core and skin temperatures were measured throughout the study to calculate changes in body heat content. Before naloxone antagonism of fentanyl-supplemented anesthesia, core temperature (mean +/- SEM) was 36.8 +/- 0.1 degrees C in the normothermic group and 34.2 +/- 0.2 degrees C in the hypothermic group (P less than 0.001). After titrated administration of naloxone during recovery, VO2 and minute ventilation (VE) increased in the hypothermic group, by 114 +/- 37% and 97 +/- 52% respectively (P less than 0.05), with a three-fold increase in four patients. In the normothermic group, VO2 increased significantly less (25 +/- 5%), without any significant change in VE. The change in VO2 and VE was significantly greater in patients who were hypothermic. VO2 was integrated throughout the recovery period to calculate recovery energy expenditure. Recovery energy expenditure and intraoperative heat loss were highly correlated (r = 0.88; P less than 0.01). This study demonstrates that the metabolic and respiratory stresses associated with naloxone-induced recovery from opioid-based anesthesia depend on the intraoperative heat loss and can therefore be reduced by preventing intraoperative hypothermia.  相似文献   
29.
30.
Background: The infusion of several liters of crystalloid solution at room temperature may significantly contribute to intraoperative hypothermia because warming fluid to core temperature requires body heat. The aim of this study was to evaluate the effect of delivering warmed intravenous (IV) fluid to the patient on preventing intraoperative hypothermia.
Methods: Intraoperative core and mean skin temperatures were measured during prolonged abdominal surgery in 18 patients randomly divided into two groups according to intraoperative IV fluid management. In 9 patients (control group) all IV fluids infused were at room temperature. In the other 9 patients (group receiving warmed fluids) all IV fluids were warmed using an active IV fluid tube-warming system. In all 18 patients a warming blanket covered the skin surface available for cutaneous warming. Intraoperative changes in total body heat content (kJ) were calculated from core and mean skin temperatures.
Results: At the end of surgery, core temperature was 36.7±0.2°C in the group receiving warmed fluids and 35.8±0.2°C in the control group ( P <0.05). The estimated reduction in heat loss provided by warming IV fluid was 217 kJ, a value very close to the theoretical value expected from thermodynamic calculation. During recovery, one patient shivered in the group receiving warmed fluids and seven in the control group ( P <0.05).
Conclusion: In conclusion, infusion of warmed fluids, combined with skin-surface warming, helps to prevent hypothermia and reduces the incidence of postoperative shivering.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号