资源类型

期刊论文 332

会议视频 6

年份

2024 3

2023 18

2022 18

2021 25

2020 17

2019 15

2018 19

2017 18

2016 10

2015 10

2014 14

2013 17

2012 14

2011 16

2010 19

2009 21

2008 32

2007 23

2006 4

2005 2

展开 ︾

关键词

城市河流 2

微反应器 2

数值模拟 2

碳中和 2

ADV 1

CCUS 1

CFD 1

CO2利用 1

Cas12a 1

Chebyshev多项式 1

Colebrook隐式方程 1

HBV相关疾病 1

HY-2 卫星 1

Matlab 1

PIV 1

Preissmann格式 1

S 特性 1

SIMPLEC算法 1

k-ε模型 1

展开 ︾

检索范围:

排序: 展示方式:

Implications of astrocytes in neurovascular coupling

You ZHOU MD, Chang-Kai SUN MD,

《医学前沿(英文)》 2010年 第4卷 第1期   页码 43-45 doi: 10.1007/s11684-010-0019-4

摘要: Normal brain function requires continuous supply of oxygen and glucose in a strict manner. The close spatial and temporal relationship between neural activity and cerebral blood flow (CBF) is termed as neurovascular coupling, which is dependent or not dependent on astrocytes. The increase in flow evoked by brain activity is mediated by the concerted action of multiple mediators that originate from different cells and act at different levels of the cerebral vasculature. More studies are needed for further understanding the precise mechanisms underlying neurovascular coupling, especially the implications of astrocytes.

关键词: cerebral blood flow     neurovascular coupling     astrocyte    

超声血流的无创伤检测和医学信号的特征提取

王威琪,汪源源,余建国,吴晓峰,刘斌,张羽,陈斯中,仪艳华,邵谦明

《中国工程科学》 2001年 第3卷 第2期   页码 52-64

摘要:

人体信号是随机性和背景噪声都很强的复杂信号。文章首先研究了利用超声Doppler技术定量检测血流速度的方法,然后将一些现代信息处理中的新理论、新方法引入医学超声的信息处理,为医学超声信息的特征提取提供了新的手段。这些理论包括:分形、数学形态学、数量化、小波变换、极点轨迹和血管传输线模型等。文章最后阐述了利用上述新方法作为技术核心而研制的三套应用系统;肺动脉血液动力学参数的无损估测系统、彩色编码的声谱系统和超声血流定量检测系统。

关键词: 超声血流     医学信号     无创伤检测     特征提取    

Non-invasive continuous blood pressure monitoring: a review of current applications

null

《医学前沿(英文)》 2013年 第7卷 第1期   页码 91-101 doi: 10.1007/s11684-013-0239-5

摘要:

Blood pressure monitoring has come a long way from the initial observations made by Reverend Hales in the 18th century. There are none that deny the importance of monitoring perioperative blood pressure; however, the limited ability of the current prevalent technology (oscillometric blood pressure monitoring) to offer continuous blood pressure measurements leaves room for improvement. Invasive monitoring is able to detect beat-to-beat blood pressure measurement, but the risks inherent to the procedure make it unsuitable for routine use except when this risk is outweighed by the benefits. This review focuses on the discoveries which have led up to the current blood pressure monitoring technologies, and especially the creation of those offering non-invasive but continuous blood pressure monitoring capabilities, including their methods of measurement and limitations.

关键词: non-invasive blood pressure monitoring     continuous blood pressure monitoring     invasive blood pressure monitoring     Riva-Rocci technique     oscillometric     Pe?áz technique     arterial tonometry     pulse transit time    

Relationship of endothelial nitric oxide synthase gene polymorphism with blood pressure, lipid profileand blood glucose level

TANG Zhongzhi, LI Junyao, YANG Jianhong

《医学前沿(英文)》 2008年 第2卷 第2期   页码 178-181 doi: 10.1007/s11684-008-0033-y

摘要: To study the relationship of the polymorphism of endothelial nitric oxide synthase (eNOS) gene and blood pressure, lipid profiles and blood glucose level. By using PCR-RFLP, the eNOS Glu298Asp gene polymorphism was detected in 184 patients with essential hypertension and 196 matched healthy individuals with normal blood pressure. Taking into account eNOS Glu298Asp polymorphisms, the relationship of blood pressure with triglycerides (TG), total cholesterol (TC), high density lipoprotein (HDL), low density lipoprotein (LDL) and blood glucose level was analyzed. The distribution of eNOS Glu298Asp polymorphism had no significant difference between different blood pressure groups and gender groups, but there was a significant difference between different age groups, diastolic blood pressure groups or BMI groups ( < 0.05). Asp/Asp genotype significantly increased the risk of hypertension in individuals with serum TC above 5.4 mmol/L ( = 0.03, = 2.65). eNOS Glu298Asp polymorphism and serum lipid could synergistically modulate the blood pressure. eNOS Asp/Asp genotype could significantly increase the risk of hypertension in individuals with serum TC over 5.4 mmol/L. eNOS Glu298Asp in combination with serum TC could be used to predict the risk of hypertension.

Overexpression of netrin-1 improves neurological outcomes in mice following transient middle cerebral

null

《医学前沿(英文)》 2011年 第5卷 第1期   页码 86-93 doi: 10.1007/s11684-011-0118-x

摘要:

Netrin-1 (NT-1) is one of the axon-guiding molecules that are critical for neuronal development. Because of its structural homology to the endothelial mitogens, NT-1 may have similar effects on vascular network formation. NT-1 was shown to be able to stimulate the proliferation and migration of human cerebral endothelial cells in vitro and also promote focal neovascularization in adult brain in vivo. In the present study, we reported the delivery of NT-1 using an adeno-associated virus (AAV) vector (AAV-NT-1) into mouse brain followed by transient middle cerebral artery occlusion (tMCAO). We found that AAV vectors did not elicit a detectable inflammatory response, cell loss or neuronal damage after brain transduction. The level of NT-1 was increased in the AAV-NT-1-transduced tMCAO mice compared with the control mice. Furthermore, the neurobehavioral outcomes were significantly improved in AAV-NT-1-transduced mice compared with the control animals (P<0.05) 7 days after tMCAO. Our data suggests that NT-1 plays a neuronal function recovery role in ischemic brain and that NT-1 gene transfer might present a valuable approach to treat brain ischemic disorders.

关键词: adeno-associated virus     angiogenesis     gene transfer     ischemia     middle cerebral artery occlusion     netrin-1    

Stroke prevention: an update

null

《医学前沿(英文)》 2012年 第6卷 第1期   页码 22-34 doi: 10.1007/s11684-012-0178-6

摘要:

Stroke is a personal, familial, and social disaster. It is the third cause of death worldwide, the first cause of acquired disability, the second cause of dementia, and its cost is astronomic. The burden of stroke is likely to increase given the aging of the population and the growing incidence of many vascular risk factors. Prevention of stroke includes—as for all other diseases—a “mass approach” aiming at decreasing the risk at the society level and an individual approach, aiming at reducing the risk in a given subject. The mass approach is primarily based on the identification and treatment of vascular risk factors and, if possible, in the implementation of protective factors. These measures are the basis of primary prevention but most of them have now been shown to be also effective in secondary prevention. The individual approach combines a vascular risk factor modification and various treatments addressing the specific subtypes of stroke, such as antiplatelet drugs for the prevention of cerebral infarction in large and small artery diseases of the brain, carotid endarterectomy or stenting for tight carotid artery stenosis, and oral anticoagulants for the prevention of cardiac emboli. There is a growing awareness of the huge evidence-to-practice gap that exists in stroke prevention largely due to socio-economic factors. Recent approaches include low cost intervention packages to reduce blood pressure and cheap “polypills” combining in a single tablet aspirin and several drugs to lower blood pressure and cholesterol. Polypill intake should however not lead to abandon the healthy life-style measures which remain the mainstay of stroke prevention.

关键词: stroke     prevention     vascular risk factors     cerebral infarction     cerebral hemorrhage     anti-thrombotic drugs     carotid endarterectomy    

survival and neuronal differentiation of hypoxia-conditioned neuronal progenitor cells in rats with cerebral

Yao Yao, Rui Zhou, Rui Bai, Jing Wang, Mengjiao Tu, Jingjing Shi, Xiao He, Jinyun Zhou, Liu Feng, Yuanxue Gao, Fahuan Song, Feng Lan, Xingguo Liu, Mei Tian, Hong Zhang

《医学前沿(英文)》 2021年 第15卷 第3期   页码 472-485 doi: 10.1007/s11684-021-0832-y

摘要: Hypoxia conditioning could increase the survival of transplanted neuronal progenitor cells (NPCs) in rats with cerebral ischemia but could also hinder neuronal differentiation partly by suppressing mitochondrial metabolism. In this work, the mitochondrial metabolism of hypoxia-conditioned NPCs (hcNPCs) was upregulated via the additional administration of resveratrol, an herbal compound, to resolve the limitation of hypoxia conditioning on neuronal differentiation. Resveratrol was first applied during the neuronal differentiation of hcNPCs and concurrently promoted the differentiation, synaptogenesis, and functional development of neurons derived from hcNPCs and restored the mitochondrial metabolism. Furthermore, this herbal compound was used as an adjuvant during hcNPC transplantation in a photothrombotic stroke rat model. Resveratrol promoted neuronal differentiation and increased the long-term survival of transplanted hcNPCs. 18-fluorine fluorodeoxyglucose positron emission tomography and rotarod test showed that resveratrol and hcNPC transplantation synergistically improved the neurological and metabolic recovery of stroke rats. In conclusion, resveratrol promoted the neuronal differentiation and therapeutic efficiency of hcNPCs in stroke rats via restoring mitochondrial metabolism. This work suggested a novel approach to promote the clinical translation of NPC transplantation therapy.

关键词: neuronal progenitor cells     resveratrol     cerebral ischemia     neuronal differentiation     mitochondrial metabolism     positron emission tomography    

White blood cell count and the incidence of hyperuricemia: insights from a community-based study

Jian Liu, Pingyan Shen, Xiaobo Ma, Xialian Yu, Liyan Ni, Xu Hao, Weiming Wang, Nan Chen

《医学前沿(英文)》 2019年 第13卷 第6期   页码 741-746 doi: 10.1007/s11684-017-0579-7

摘要: Hyperuricemia (HUA) is a risk factor for chronic kidney disease (CKD). The relationship between HUA and white blood cell (WBC) count remains unknown. A sampling survey for CKD was conducted in Sanlin community in 2012 and 2014. CKD was defined as proteinuria in at least the microalbuminuric stage or an estimated GFR of 60 mL/(min·1.73 m ). HUA was defined as serum uric acid>420 µmol/L in men and>360 µmol/L in women. This study included 1024 participants. The prevalence of HUA was 17.77%. Patients with HUA were more likely to have higher levels of WBC count, which was positively associated with HUA prevalence. This association was also observed in participants without CKD, diabetes mellitus, hyperlipidemia, or obesity. Multivariate logistic regression analysis showed that WBC count was independently associated with the risk for HUA in male and female participants. Compared with participants without HUA, inflammatory factors such as high-sensitivity C-reactive protein, tumor necrosis factor-α and interleukin 6 increased in participants with HUA. Hence, WBC count is positively associated with HUA, and this association is independent of conventional risk factors for CKD.

关键词: white blood cell count     hyperuricemia     chronic kidney disease     inflammation    

gelatin-heparin nanofibrous scaffolds formed by a bi-layer electrospinning technique as potential artificial blood

Heyun WANG, Yakai FENG, Marc BEHL, Andreas LENDLEIN, Haiyang ZHAO, Ruofang XIAO, Jian LU, Li ZHANG, Jintang GUO

《化学科学与工程前沿(英文)》 2011年 第5卷 第3期   页码 392-400 doi: 10.1007/s11705-011-1202-0

摘要: In this paper, a scaffold, which mimics the morphology and mechanical properties of a native blood vessel is reported. The scaffold was prepared by sequential bi-layer electrospinning on a rotating mandrel-type collector. The tubular scaffolds (inner diameter 4 mm, length 3 cm) are composed of a polyurethane (PU) fibrous outer-layer and a gelatin-heparin fibrous inner-layer. They were fabricated by electrospinning technology, which enables control of the composition, structure, and mechanical properties of the scaffolds. The microstructure, fiber morphology and mechanical properties of the scaffolds were examined by means of scanning electron microscopy (SEM) and tensile tests. The PU/gelatin-heparin tubular scaffolds have a porous structure. The scaffolds achieved a breaking strength (3.7±0.13 MPa) and an elongation at break (110±8%) that are appropriate for artificial blood vessels. When the scaffolds were immersed in water for 1 h, the breaking strength decreased slightly to 2.2±0.3 MPa, but the elongation at break increased to 145±21%. In platelet adhesion tests the gelatin-heparin fibrous scaffolds showed a significant suppression of platelet adhesion. Heparin was released from the scaffolds at a fairly uniform rate during the period of 2 day to 9 day. The scaffolds are expected to mimic the complex matrix structure of native arteries, and to have good biocompatibility as an artificial blood vessel owing to the heparin release.

关键词: electrospinning     artificial blood vessels     scaffold     polyurethane     gelatin     nanofiber     hemocompatibility    

Study of blood exposure-related mental health illness among clinical nurses

null

《医学前沿(英文)》 2017年 第11卷 第1期   页码 147-151 doi: 10.1007/s11684-016-0481-8

摘要:

Nurses are subjected to high amount of stress in the medical setting, and work-related stress often leads to mental problems. This study aims to investigate the mental health status of nurses exposed to blood through needlestick injuries. A total of 302 nurses working in the hospital of Guangdong, China, participated in this study. Out of the 302 nurses, 140 did not experience any needlestick injuries during the previous week, whereas 162 nurses experienced needlestick injuries. The General Health Questionnaire (GHQ)-28 Standardized Questionnaire, which uses physical, anxiety, social function, and depression subscales, was used in this study. No significant difference between nurses exposed to blood and nurses not exposed to blood was found in terms of gender, age, length of employment, and civil status (P>0.05). Results from the GHQ-28 Standardized Questionnaire showed that 75.9% (123/162) of nurses exposed to blood were suspected to suffer from mental disorders, whereas 40% (56/140) of nurses not exposed to blood were suspected to suffer from mental disorders. The mean mental health scores of nurses exposed to blood and those not exposed were 8.73±7.32 and 5.69±5.70, respectively. From these results, we can conclude that blood exposure from needlestick injuries leads to higher prevalence of depression, anxiety, and stress symptoms in nurses. This finding highlights the importance of providing efficient, adequate, and appropriate support services after nurses are exposed to blood from needlestick injuries.

关键词: blood exposure     needlestick injuries     mental health     nurses    

Endostatin specifically targets both tumor blood vessels and lymphatic vessels

Wei Zhuo, Yang Chen, Xiaomin Song, Yongzhang Luo

《医学前沿(英文)》 2011年 第5卷 第4期   页码 336-340 doi: 10.1007/s11684-011-0163-5

摘要: Endostatin, a 20 kDa C-terminal fragment of collagen XVIII, was first identified as a potent angiogenic inhibitor. The anti-angiogenic function of endostatin has been well documented during the past decade. Recently, several studies demonstrated that endostatin also inhibits tumor lymphangiogenesis and lymphatic metastasis. However, the exact mechanism that endostatin executes its anti-angiogenic and anti-lymphangiogenic functions remains elusive. In the current mini-review, we briefly summarize recent novel findings, including the functions of endostatin targeting not only angiogenesis but also lymphangiogenesis, and the underlying mechanism by which endostatin internalization regulates its biological functions.

关键词: endostatin     angiogenesis     lymphangiogenesis     nystatin     internalization     tumor    

Intracellular trehalose improves the survival of human red blood cells by freeze-drying

HE Hui, LIU Baolin, HUA Zezhao, LI Chuan, WU Zhengzheng

《能源前沿(英文)》 2007年 第1卷 第1期   页码 120-124 doi: 10.1007/s11708-007-0014-x

摘要: Freeze-drying of human red blood cells has a potential important application for blood transfusion. The aim of this study was to investigate the effects of intracellular trehalose on the survival of red blood cells after freeze-drying and rehydration. Fresh red blood cells were incubated in trehalose solutions of various concentrations at 37vH for 7 h following freeze-drying. Polyvinylpyrrolidone, Trehalose, sodium citrate, and human serum albumin were used as extracellular protective agents for the freeze-drying of red blood cells. The results indicated that the intracellular trehalose concentration was increased with increasing concentration of extracellular trehalose solution, and the maximum concentration of intracellular trehalose reached 35 mmol/L. The viability of freeze-dried red blood cells increased with the increment of intracellular trehalose concentration.

我国人群血脂水平现状及其对策

陈灏珠,金雪娟

《中国工程科学》 2002年 第4卷 第11期   页码 1-6

摘要:

回顾分析50年来我国健康人群血脂水平的变化,结果显示血总胆固醇(TC)、甘油三酯(TG)和低密度脂蛋白胆固醇(LDL-C)随年龄而增高,50岁以前男女间无差别,50岁以后女性高于男性,城市居民高于农村居民;高密度脂蛋白胆固醇(HDL-C)随年龄的变化不明显,男性低于女性;血TC、TG和LDL-C随年代而增高,20世纪90年代末达最高峰,而HDL-C则下降;血TC高于正常者(>200~220 mg/dL)男性占17.8 %~54.9 %,女性占14.9 %~53.4 %,也随年代而增多;血脂水平的变化与饮食结构转变为低碳水化合物、高脂肪、高胆固醇有关。对策:恢复健康的饮食习惯,摄取平衡饮食;建立良好生活习惯,减少其他心血管病危险因素,特别建议进行体育锻炼;已有血脂异常,经饮食调节和体育锻炼3个月以上仍未见好转者,宜接受调脂药物治疗。

关键词: 血脂     流行病学     预防    

Effects of RNA interference targeting angiotensin 1a receptor on blood pressure and cardiac hypertrophy

ZHANG Jingqun, SUN Honglei, MA Yexin, WANG Daowen

《医学前沿(英文)》 2008年 第2卷 第1期   页码 19-24 doi: 10.1007/s11684-008-0005-2

摘要: The aim of this study is to investigate the effects of RNA interference (RNAi) targeting angiotensin 1a receptor (AT1a) on blood pressure and cardiac hypertrophy of rats with renovascular hypertension. Two RNAi plasmids, pAT1a-shRNA1 and pAT1a-shRNA2 each carrying a U6 promoter and an AT1a-specific shRNA-coding template sequence corresponding to the sites 928–946, 978–996 of the mRNA transcript, and a control plasmid pCon carrying a nonspecific shRNA-coding sequence were constructed. Thirty Sprague – Dawley rats with renovascular hypertension (2-kidney 1-clip) were randomly divided into 5 equal groups: Control group (without any intervention), pAT1a-shRNA1, pAT1a-shRNA2, pCon groups (with injection of the corresponding plasmid 4 mg/kg respectively into the tail vein), and valsartan group (30 mg/kg·d by gavage). Three weeks after drug administration, pAT1a-shRNA1, pAT1a-shRNA2 and valsartan respectively resulted in decrease of the tail blood pressure by (15.1 ± 5.4), (16.4 ± 8.4) and (30.6 ± 18.2) mmHg. However, the tail blood pressure increased further by about 25 mmHg in both of pCon and control groups. The carotid artery pressures of pAT1a-shRNA1, pAT1a-shRNA2 and valsartan groups were all significantly lower than those of the control and pCon groups. The ratio of left ventricle weight to body weight (LV/BW) of the rats in pAT1a-shRNA1, pAT1a-shRNA2, and valsartan groups decreased significantly than in the control group ( < 0.01), similar to those of the normal SD rats( > 0.05). Histopathological examination showed that the myocardiocytes were significantly hypertrophic and the basal membrane of the aorta was significantly thickened in the control group and such changes were alleviated in the pAT1a-shRNA1, pAT1a-shRNA2 and valsartan groups. Compared with the control group, pAT1a-shRNA1 and pAT1a-shRNA2 groups had lowered expression of AT1 receptor (in the myocardium and the thoracic aorta (all < 0.01); however, there were no significant differences in expression levels of AT1 receptor in valsartan and the control groups ( > 0.05). We conclude that RNAi targeting AT1a receptor inhibits the development of renovascular hypertension and the accompanying cardiac hypertrophy. RNAi technology may become a new strategy of gene therapy for hypertension.

关键词: therapy     Sprague     administration     cardiac hypertrophy     valsartan    

Using hybrid models to predict blood pressure reactivity to unsupported back based on anthropometric

Gurmanik KAUR,Ajat Shatru ARORA,Vijender Kumar JAIN

《信息与电子工程前沿(英文)》 2015年 第16卷 第6期   页码 474-485 doi: 10.1631/FITEE.1400295

摘要: Accurate blood pressure (BP) measurement is essential in epidemiological studies, screening programmes, and research studies as well as in clinical practice for the early detection and prevention of high BP-related risks such as coronary heart disease, stroke, and kidney failure. Posture of the participant plays a vital role in accurate measurement of BP. Guidelines on measurement of BP contain recommendations on the position of the back of the participants by advising that they should sit with supported back to avoid spuriously high readings. In this work, principal component analysis (PCA) is fused with forward stepwise regression (SWR), artificial neural network (ANN), adaptive neuro-fuzzy inference system (ANFIS), and the least squares support vector machine (LS-SVM) model for the prediction of BP reactivity to an unsupported back in normotensive and hypertensive participants. PCA is used to remove multi-collinearity among anthropometric predictor variables and to select a subset of components, termed ‘principal components’ (PCs), from the original dataset. The selected PCs are fed into the proposed models for modeling and testing. The evaluation of the performance of the constructed models, using appropriate statistical indices, shows clearly that a PCA-based LS-SVM (PCA-LS-SVM) model is a promising approach for the prediction of BP reactivity in comparison to others. This assessment demonstrates the importance and advantages posed by hybrid models for the prediction of variables in biomedical research studies.

关键词: Blood pressure (BP)     Principal component analysis (PCA)     Forward stepwise regression     Artificial neural network (ANN)     Adaptive neuro-fuzzy inference system (ANFIS)     Least squares support vector machine (LS-SVM)    

标题 作者 时间 类型 操作

Implications of astrocytes in neurovascular coupling

You ZHOU MD, Chang-Kai SUN MD,

期刊论文

超声血流的无创伤检测和医学信号的特征提取

王威琪,汪源源,余建国,吴晓峰,刘斌,张羽,陈斯中,仪艳华,邵谦明

期刊论文

Non-invasive continuous blood pressure monitoring: a review of current applications

null

期刊论文

Relationship of endothelial nitric oxide synthase gene polymorphism with blood pressure, lipid profileand blood glucose level

TANG Zhongzhi, LI Junyao, YANG Jianhong

期刊论文

Overexpression of netrin-1 improves neurological outcomes in mice following transient middle cerebral

null

期刊论文

Stroke prevention: an update

null

期刊论文

survival and neuronal differentiation of hypoxia-conditioned neuronal progenitor cells in rats with cerebral

Yao Yao, Rui Zhou, Rui Bai, Jing Wang, Mengjiao Tu, Jingjing Shi, Xiao He, Jinyun Zhou, Liu Feng, Yuanxue Gao, Fahuan Song, Feng Lan, Xingguo Liu, Mei Tian, Hong Zhang

期刊论文

White blood cell count and the incidence of hyperuricemia: insights from a community-based study

Jian Liu, Pingyan Shen, Xiaobo Ma, Xialian Yu, Liyan Ni, Xu Hao, Weiming Wang, Nan Chen

期刊论文

gelatin-heparin nanofibrous scaffolds formed by a bi-layer electrospinning technique as potential artificial blood

Heyun WANG, Yakai FENG, Marc BEHL, Andreas LENDLEIN, Haiyang ZHAO, Ruofang XIAO, Jian LU, Li ZHANG, Jintang GUO

期刊论文

Study of blood exposure-related mental health illness among clinical nurses

null

期刊论文

Endostatin specifically targets both tumor blood vessels and lymphatic vessels

Wei Zhuo, Yang Chen, Xiaomin Song, Yongzhang Luo

期刊论文

Intracellular trehalose improves the survival of human red blood cells by freeze-drying

HE Hui, LIU Baolin, HUA Zezhao, LI Chuan, WU Zhengzheng

期刊论文

我国人群血脂水平现状及其对策

陈灏珠,金雪娟

期刊论文

Effects of RNA interference targeting angiotensin 1a receptor on blood pressure and cardiac hypertrophy

ZHANG Jingqun, SUN Honglei, MA Yexin, WANG Daowen

期刊论文

Using hybrid models to predict blood pressure reactivity to unsupported back based on anthropometric

Gurmanik KAUR,Ajat Shatru ARORA,Vijender Kumar JAIN

期刊论文