航天医学与医学工程最新文献_第2页

[Effects of hypoxic acclimatization on myocardial sarcoplasmic reticulum ATPase and 45Ca2+ uptake in rats]. [缺氧适应对大鼠心肌肌浆网atp酶和45Ca2+摄取的影响]。

航天医学与医学工程 Pub Date : 2005-08-01

Chao-liang Long, Yan-fang Zhang, Zhao-yun Yin, Hai Wang

{"title":"[Effects of hypoxic acclimatization on myocardial sarcoplasmic reticulum ATPase and 45Ca2+ uptake in rats].","authors":"Chao-liang Long, Yan-fang Zhang, Zhao-yun Yin, Hai Wang","doi":"","DOIUrl":"","url":null,"abstract":"Objective: To study the effect of acute hypoxia and hypoxic acclimatization on myocardial function of rats.Method: Eighteen male Wistar rats were randomly divided into three groups: normoxic control, acute hypoxia and intermittent hypoxic acclimatization group (n=6). After being exposed to hypoxia (8000 m) for 4 h before and after intermittent hypoxic acclimatization (3000 m and 5000 m, 14 d respectively, 4 h/d), the rats were decapitated and then myocardial sarcoplasmic reticulum (SR) were derived from cardiac muscles. Activities of Na+, K(+)-ATPase, Ca2+, Mg2(+)-ATPase in SR, phosphorylation of phospholamban (PLB) and the ability of 45Ca2+ uptake in SR were observed in all these three groups.Result: 1) Hypoxia had no effects on the activity of Na+, K(+)-ATPase in rats myocardial SR of rats. 2) Compared with normoxic control rats, the activity of Ca2+, Mg2(+)-ATPase in myocardial SR of rats after acute hypoxia was reduced significantly (P<0.01). After intermittent hypoxic acclimatization, its activity increased significantly as compared with that of acute hypoxic rats (P<0.01). 3) The phosphorylation of PLB in acute hypoxic rats was reduced significantly compared with normoxic control rats. After intermittent hypoxic acclimatization, its phosphorylation was increased significantly compared with that of acute hypoxic rats. It suggests that hypoxic acclimatization could alleviate the inhibition of calcium pump. 4) The ability of 45Ca2+ uptake of SR in acute hypoxic rats was decreased significantly. After hypoxic acclimatization, its ability was strengthened significantly.Conclusion: These results suggest that the increased function of myocardial SR calcium pump, the strengthened phosphorylation of PLB to alleviate the inhibition of calcium pump and the increased function of Ca2+ transport in SR are the mechanisms of hypoxic acclimatization protecting cardiac functions from injury induced by severe hypoxia.","PeriodicalId":63677,"journal":{"name":"航天医学与医学工程","volume":"18 4","pages":"267-70"},"PeriodicalIF":0.0,"publicationDate":"2005-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25635413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

[Effects of Ligustrazine and Radix Astragali on activities of myosin adenosine triphosphatase of soleus muscle and muscle atrophy in tail-suspended rats]. [川芎嗪和黄芪对悬尾大鼠比目鱼肌肌球蛋白腺苷三磷酸酶活性及肌肉萎缩的影响]。

航天医学与医学工程 Pub Date : 2005-08-01

Yun-fang Gao, Xiao-li Fan, Zhi-xian He, Su-di Wu, Xin-ai Song

{"title":"[Effects of Ligustrazine and Radix Astragali on activities of myosin adenosine triphosphatase of soleus muscle and muscle atrophy in tail-suspended rats].","authors":"Yun-fang Gao, Xiao-li Fan, Zhi-xian He, Su-di Wu, Xin-ai Song","doi":"","DOIUrl":"","url":null,"abstract":"Objective: To study the effects of Ligustrazine (Lig) and Radix Astragali (Rad) on activities of myosin adenosine triphosphatase (mATPase) of soleus muscle and atrophy in tail-suspended rat.Method: Weightlessness was simulated by tail suspension in female rats. The activities of mATPase of intrafusal and extrafusal fibres in soleus muscle were detected by method of Ca2(+)-ATPase.Result: 1) Compared with tail-suspended (TS) group, the percentage of type II fibres of SOL in both Ligustrazine (Lig) group and Rad group decreased distinctly. Furthermore, the percentage of type I and type II fibres of SOL in Rad group showed no difference with control (CON) group. 2) The type I CSA of Lig group was markedly larger than that in TS group, and there was no difference as compared with that of CON group. CSA of type I, II and average CSA of Rad group were remarkably larger than those in TS group, and there were no difference as compared with those of CON group. 3) mATPase activities of intrafusal fibres in both Lig group and Rad group were approximate to that of CON group.Conclusion: Lig and Rad are both able to effectively prevent muscle atrophy caused by tail suspension, restrain the slow-twitch muscle transform to fast-twitch muscle and control the increase of mATPase activities caused by weightlessness.","PeriodicalId":63677,"journal":{"name":"航天医学与医学工程","volume":"18 4","pages":"262-6"},"PeriodicalIF":0.0,"publicationDate":"2005-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25635411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Automatic segmentation of echocardiography based on a morphological reconstruction algorithm. 基于形态学重构算法的超声心动图自动分割。

航天医学与医学工程 Pub Date : 2005-08-01

Xian-hua Shen, De-yu Li, Jiang-li Lin, Tian-fu Wang, Xiao-hui Wen, Chang-qiong Zheng, Li Rao, Hong Tang

{"title":"Automatic segmentation of echocardiography based on a morphological reconstruction algorithm.","authors":"Xian-hua Shen, De-yu Li, Jiang-li Lin, Tian-fu Wang, Xiao-hui Wen, Chang-qiong Zheng, Li Rao, Hong Tang","doi":"","DOIUrl":"","url":null,"abstract":"Objective: To improve the precision of the traditional segmentation of echocardiogram, by suppressing the influence from inherent speckle noises in medical ultrasonic images.Method: An automatic segmentation method based on reconstructed morphology was proposed in this paper. First, the opening and closing operations by reconstruction were imposed to the ultrasonic image. Second, the top-hat operation was used to extract the bright and/or dark features and to find out the boundaries corresponding to these features, whereby implemented the automatic segmentation.Result: The segmented echocardiogram had less artificial boundaries resulted from speckle noise, and could accurately be extracted the artery and ventricle.Conclusion: The presented method can detect both dark and bright objects accurately, and the boundary has a fine continuity. In addition, the algorithm is also applicable to the extraction of sole bright/dark features, accordingly to reduce the complexity and time needed and to improve the accuracy.","PeriodicalId":63677,"journal":{"name":"航天医学与医学工程","volume":"18 4","pages":"246-50"},"PeriodicalIF":0.0,"publicationDate":"2005-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25634932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

[Experimental study of pilots' scan and performance, workloads]. [飞行员扫描与表现的实验研究，工作量]。

航天医学与医学工程 Pub Date : 2005-08-01

Wei Liu, Xiu-gan Yuan, Zhong-qi Liu, Wei-yong Kang, Rui Ma

引用次数: 0

[C2H4 reducing facility for controlled ecological life support system]. [可控生态生命维持系统C2H4还原装置]。

航天医学与医学工程 Pub Date : 2005-06-01

Wei-dang Ai, Shuang-sheng Guo, Xiang-yang Liu, Wen-hua Leng

{"title":"[C2H4 reducing facility for controlled ecological life support system].","authors":"Wei-dang Ai, Shuang-sheng Guo, Xiang-yang Liu, Wen-hua Leng","doi":"","DOIUrl":"","url":null,"abstract":"Objective: To develop an experimental facility for reducing C2H4 produced by plants' growing in the controlled ecological life support system (CELSS).Method: Based on technical parameters and performance requirements, project planning, design drawing, fabrication, and debug were conducted. Then, an experimental test for reducing C2H4 was done by measuring the content of C2H4 in gases between the inlet and the outlet of the facility. Its C2H4 decomposing capacity was evaluated.Result: The facility worked well, and the parameters, such as energy consumption, and volume, met the design requirements. The experimental test results demonstrated that the content of C2H4 was reduced from 0.034 mg/kg to below 0.010 mg/kg, under the condition that the relative humidity and velocity of flow of the inlet-gas was 20% and 1.0-3.0 L/min respectively, and power of the lamp was 48 W. Considering the composition and the content of the gas in the outlet of the facility, there was no harmful product to the plants, except CO2 and H2O.Conclusion: The facility has reasonable technical indices, and smooth and dependable performances. It can be used as a facility for decomposing C2H4 in plants growing system in CELSS.","PeriodicalId":63677,"journal":{"name":"航天医学与医学工程","volume":"18 3","pages":"186-90"},"PeriodicalIF":0.0,"publicationDate":"2005-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25298820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

[Effects of switching between neutral and emotional stimuli: an ERP study on "switch cost"]. [中性刺激和情绪刺激之间转换的影响:一个关于“转换成本”的ERP研究]。

航天医学与医学工程 Pub Date : 2005-06-01

Hui Shi, Lun Zhao, Yue-jia Luo, Miao Peng, Kui-he Jin

引用次数: 0

[Study on weightlessness dynamics simulated by neutral buoyancy in air-driven shell]. 气动壳体中性浮力模拟失重动力学研究

航天医学与医学工程 Pub Date : 2005-06-01

Qing-yi Feng, Jun-feng Li, Tian-shu Wang

引用次数: 0

[Effects of digital information display time on human and machines monitoring performance]. [数字信息显示时间对人和机器监测性能的影响]。

航天医学与医学工程 Pub Date : 2005-06-01

Zhan-sheng Qu, Qian-xiang Zhou, Chun-hui Wang, Ling Cheng

{"title":"[Effects of digital information display time on human and machines monitoring performance].","authors":"Zhan-sheng Qu, Qian-xiang Zhou, Chun-hui Wang, Ling Cheng","doi":"","DOIUrl":"","url":null,"abstract":"Objective: To provide an index for function allocation of information monitoring between human and machine by studying the effect of digital information display time on human or machine monitoring performance.Method: Two computers were used. One computer, ten numbers with two decided digits were displayed randomly for three times. The display time varied from 200 ms to 5000 ms with different intervals. The other's monitor was simulated by a camera recorder and image identifying arithmetics was designed. Subjects watched the CRT and press the computer keys related with the figure on the CRT. In every experiment, the correct rate of human press or machine identification was recorded.Result: The subjects' correct rate varied sharply when display time was 1500 ms. When display time was shorter then 1500 ms, subjects' correct rate decreased accordingly and may approach 0. From 1500 ms to 4500 ms, the subjects' correct rate was close to 100.0%. But when the display time was 5000 ms, the subjects' correct rate decreased slightly to 97.67%. From 50 ms to 5000 ms, the machine's correct rate varied little at different display times.Conclusion: The digital display time has very great effect on human monitoring performance. But it has little effect on machine performance.","PeriodicalId":63677,"journal":{"name":"航天医学与医学工程","volume":"18 3","pages":"191-5"},"PeriodicalIF":0.0,"publicationDate":"2005-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25298821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

[Observation of the cognition and the velocities of blood in the brain in cerebral arteriosclerosis and infarct patients]. 脑动脉硬化及梗死患者认知功能及脑血流速度的观察

航天医学与医学工程 Pub Date : 2005-06-01

Zong-jun Guo, Mo-wei Shen, Li-ying Jin

{"title":"[Observation of the cognition and the velocities of blood in the brain in cerebral arteriosclerosis and infarct patients].","authors":"Zong-jun Guo, Mo-wei Shen, Li-ying Jin","doi":"","DOIUrl":"","url":null,"abstract":"Objective: To observe the change of the cognition and the supply of blood in brain in healthy people and patients with arteriosclerosis (AS) and cerebral infarct.Method: 1) control group: healthy people, 30 cases. 2) AS group: 22 cases with cerebral arteriosclerosis. Cerebrovascular infarct patients were divided into two groups. 3) 2W group: 21 cases, the patients' course of disease was shorter than two weeks. 4) 6M group: 20 cases, the patients' course of disease was from six months to four years. All cases were checked with cognitive P300 and transcranial doppler ultrasound (TCD) and mini-mental status examination (MMSE).Result: The result revealed that the P300 incubation period in 2W group, 6M group and the AS group was remarkable extend than the control group (P<0.01), meanwhile the period of the 6M group was longer than the AS group (P<0.05); the amplitude of the wave of the 2W group and 6M group were shorter than the control group (P<0.05; 0.05). The velocities of bilateral MCA and right ACA were remarkable improved in AS group (P<0.05; 0.01), and the velocities of left MCA both in 2W and 6M group, the right ACA and BA in 6M group were remarkably decreased than the control group (P<0.05; 0.01). The grades of MMSE in all patients were lower than the control group and the grades in 6M group was lower than the AS group.Conclusion: There are some changes in the P300 and abnormality of brain blood supply in the cerebral infarct patients and AS patients. The longer the course, the more serious of the cognition with the patients.","PeriodicalId":63677,"journal":{"name":"航天医学与医学工程","volume":"18 3","pages":"170-2"},"PeriodicalIF":0.0,"publicationDate":"2005-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25300071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

[Analysis and processing of two-lead ECG signals based on orthogonal synthesizing]. 基于正交合成的双导联心电信号分析与处理

航天医学与医学工程 Pub Date : 2005-06-01

Ling Huang, Hong Yan

引用次数: 0