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Bio-medical Electronics, IEEE Transactions on

Issue 2 • Date April 1963

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Displaying Results 1 - 15 of 15
  • [Table of contents]

    Page(s): c1
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  • IEEE Professional Technical Group on Bio-Medical Electronics

    Page(s): c2
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  • Editorials

    Page(s): 39
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  • A Spectrofluorometer for Recording of Intracellular Oxidation-Reduction States

    Page(s): 40 - 47
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    A simple and versatile microspectrofluorometer is described together with suitable electronic circuits for single-differential-or double-aperture operation. The apparatus is suitable for measuring oxidation-reduction states of mitochondrial and cytoplasmic pyridine nucleotide in various organs with apertures ranging from 15 microns up to a few millimeters. Suitable optical and electronic components are briefly described together with some of their limitations. The application of the method to the state of oxygenation of brain and liver together with the recording of hormonal responses in the heart is indicated. An outline of the limitations of the present apparatus and desirable future developments is included. View full abstract»

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  • Computers and Data Processing for Nervous System Research

    Page(s): 48 - 56
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    Some important requirements are outlined for future research on the nervous system if more complex details are to be determined and effectively applied to engineering systems. In particular, these include the development of more precisely controlled and accurate complex stimulus-response experiments, the rapid analysis of characteristically noisy records for the detection of fine detail responses and the intensive correlation of such experiments with adequate theoretical modeling. An "on-line" remote computer station used in conjunction with a central data processing system is described which facilitates the above objectives. This biological control and data processing system is designed to control and accurately record complex multistimuli multiresponse experiments, rapidly digitize pertinent information, send this to the central computer and also receive back analyzed results in graphical form. The application of the system to specific research, at the California Institute of Technology, on sight perception systems is illustrated. Particularly pertinent has been its use to accurately determine and analyze the complex flight torque phototropisms of the housefly, Musca domestica. Less sophisticated experiments made before the application of this data processing system were most discouraging. This was due to the extreme variations between single records, the large apparent noise or uncorrelated responses together with the evidence of complex multifrequency responses and variable sensitivity to different components of the stimuli. The application of the computer system resolved the data analysis problems and many of the required stimulus accuracy problems. View full abstract»

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  • A Low-Cost Portable Electromagnetic Blood-Flow Meter System Utilizing Commercially Available Devices

    Page(s): 57 - 60
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    By taking advantage of readily available industrial devices, used in conjunction with a simple auxiliary circuit, an efficient inexpensive blood-flow measuring system can be obtained. As a further advantage, the preamplifier and demodulator-recorder may be detached and used for other purposes. Flow recordings obtained with this system appear to equal or better recordings obtained with commercial integrated electromagnetic blood-flow measuring systems in regard to both frequency response and noise level. The system also exhibits high reliability and ease of operation as well as portability. View full abstract»

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  • Electronic Simulation of Daily Rhythm in Nocturnal Animals

    Page(s): 68 - 73
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    The term biological clock is used to designate the phenomenon, displayed by organisms, of pacing activity in a cyclic manner related to environment. Many nocturnal animals, for example, are capable of entraining the onset of their activity with the light-to-dark transition in a periodic light-dark regime in which the period or ratio of light to darkness varies widely. This paper presents the development of an electronic model for simulation of the adaptation of the endogenous circadian rhythm of nocturnal animals due to light stimuli. View full abstract»

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  • A Transducer for the Continuous External Measurement of Arterial Blood Pressure

    Page(s): 73 - 81
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    The objective of the research was to develop a transducer to measure arterial blood pressure. It was required that the transducer provide a continuous measure of blood pressure, that it not encumber the subject and that it not require cannulation. Two basic techniques were investigated both analytically and experimentally. First, an indirect measurement of blood pressure based on arterial deflection was attempted. Difficulties of calibration; and sensitivity to physiological changes of skin and tissue around the artery led to the decision to attempt a more direct measurement of arterial blood pressure. In this second approach, arterial deflection is restrained by the transducer and the resultant restraining force is measured. A mathematical model of the transducer artery system was developed and was used as a guide for the design of the experimental prototype transducers. Tests performed on these experimental transducers gave results consistent with the predictions of the model. These transducers have been used to measure blood pressure at large superficial arteries, with results comparable to sphygmomanometer determinations. View full abstract»

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  • A Method of Monitoring Ventricular Contraction by Intranasal Thermometry

    Page(s): 82 - 83
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  • Biologically-Energized Cardiac Pacemaker

    Page(s): 83
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  • Announcements

    Page(s): 84
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  • IEEE Transactions on Bio-Medical Electronics Statement of Editorial Policy

    Page(s): 84-a
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  • Information for authors

    Page(s): 84a
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  • Institutional listings

    Page(s): 84b
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Aims & Scope

This Transactions ceased publication in 1963. The current retitled publication is Biomedical Engineering, IEEE Transactions on

Full Aims & Scope