NASA Scientific and Technical Aerospace Reports

20040046869 Institute of Space Medico-Engineering, Beijing, China
Effect of Microwave Irradiation on ATPase Activity and Voltage Dependent Ion Channel of Rat Hippocampus Cell
Membrane
Zhao, Ya-Li; Ma, Hong-Bo; Song, Jin-Ping; Yang, Yu-Hua; Pu, Jing-Sui; Zheng, Jian-Quan; Space Medicine and Medical
Engineering, Volume 16, No. 1; February 2003, pp. 36-40; In Chinese; See also 20040046857; Copyright; Avail: Other
Sources
The objective of this research is to study the effect of microwave irradiation on hippocampus cell. Changes of ATPase
activity and voltage dependent ion channel of hippocampus cell membrane were observed in mice exposed to 2 450 MHz
microwave irradiation of 10 milliwatts per square centimeters from a physical therapy machine. Histochemical method and
patch clamp method were used to determine the activity of Na(+), K(+) -ATPase, Ca(2+), Mg(2+) -ATPase and voltage
dependent Na(+), K(+), Ca(2+) channels respectively. 1) Na(+), K(+) -ATPase activity of microwave irradiated mice showed
no significant change as compared with the control, but the activity of Ca(2+), Mg(2+) -ATPase decreased significantly (P less
than 0.05); 2) In microwave irradiated mice, Na(+), K(+), Ca(2+) current inducement rate in hippocampus neuron decreased
significantly, the membrane voltage of Na(+) current peak shifted to depolarization, and the attenuation rate of Na(+) current
and current A inducement rate decreased significantly as compared with control mice. Irradiation of 2 450 MHz microwave
at a doze of 10 milliwatts per square centimeter was not fatal to mice hippocampus cell. But Ca(2+), Mg(2+) -ATPase activity
of hippocampal cell membrane and voltage dependent Na(+), K(+), Ca(2+) ion channel of hippocampal nervous were affected
which would affect study and memory.
Derived from text
Hippocampus; Irradiation; Microwaves; Rats; Cell Membranes (Biology); Electric Potential; Ion Channels (Biology)
20040046870 Institute of Space Medico-Engineering, Beijing, China
Analysis of Heat Transfer in Skin Tissues Subjected to Hot Water
Jiang, Shi-chen; Li, He-jie; Ma, Ning; Zhang, Xue-xue; Space Medicine and Medical Engineering, Volume 16, No. 1;
February 2003, pp. 44-47; In Chinese; See also 20040046857; Copyright; Avail: Other Sources
The objective of this research is to analyze heat transfer process in skin tissues subjected to hot water and thus to predict
the extent of scald. Based on Pennes’ Bio-heat Equation, a model for characterizing the damage process in tissues was
presented and used for its analysis. Temperature distribution in the tissues during the process and the time of beginning of scald
were numerically obtained. It was found that the effects of different initial temperature distribution, convection coefficients
between the hot water and the tissue surfaces, and the temperature of the hot water are significant. The transient heat transfer
behavior in multi-layer tissues subjected to hot water can be predicted by the present model. It is useful in the clinical
diagnosis and therapy for the scald caused by hot water.
Derived from text
Heat Transfer; Mathematical Models; Tissues (Biology); Skin (Anatomy); Aerospace Medicine; Water Temperature; Hot
Surfaces
20040046871 Tsinghua Univ., Bejing, China
Development of Data Acquisition Card in Exercise-ECG Detection System
Sun, Yang; Shen, Yong-lin; Xie, Hong-tao; Space Medicine and Medical Engineering, Volume 16, No. 1; February 2003,
pp. 64-67; In Chinese; See also 20040046857; Copyright; Avail: Other Sources
The objective of this research is to develop a data acquisition card in exercise-ECG detection system that can gather
multi-channel exercise-ECG signals simultaneously and precisely. 1) In hardware, the card was based on 196 KC single-chip
microprocessor which can gather signals, process data and control circuit; 2) In software, single-chip microprocessor
completed the following three main tasks: the A/D conversion, signal processing and communication with computer. The main
computed receives the data and performs real time data processing. The data acquisition card in exercise-ECG detection
system cooperates with the main CPU. In order to release the main CPU, the card realizes the data pre-processing and makes
reasonable uses of the hardware resource. The data acquisition card could meet the needs of clinical detection of
exercise-ECG.
Author
Data Acquisition; Detection; Electrocardiography; Physical Exercise; Punched Cards; Aerospace Medicine; Chips
(Electronics)
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