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  • 1
    Electronic Resource
    Electronic Resource
    On the production of food yeast from partially hydrolyzed cereal straw (1948)
    Springer
    Antonie van Leeuwenhoek 14 (1948), S. 97-125 
    Details
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. Cereal straw was partially hydrolyzed with dilute sulphuric or hydrochloric acid at elevated temperatures, yielding about 20% of matter assimilable byTorulopsis utilis (calculated on oven-dry straw), which consisted chiefly of xylose, with small amounts of glucose and acetic acid. 2. Experiments on a laboratory scale with non-fermentable substrates like ethanol and acetic acid showed that also in these cases an ample aeration is an essential condition for a good yield. 3. Acetic acid is harmful to the yeast, even in small concentrations, when the pH is lower than 5.0. 4. Small quantities of glucose or acetic acid stimulate the conversion of xylose byTorulopsis utilis. 5. With an adequate aeration and an initial pH of 5.5–6.0 (maintained at this level until the acetic acid has disappeared and then lowered to 4.0–4.5) satisfactory conversion rates and yields could be obtained on straw extracts as mentioned sub 1. 6. The results of the laboratory experiments mentioned sub 5 could be reproduced in a semi-technical installation with a capacity of 200 l straw extract. 7. Good results were obtained in this installation with aVogelbusch aeration device, while foaming could be adequately controlled by means of a rotating wire screen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02272683
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamic computer-generated displays of data from biplane roentgen angiography for study of the left ventricle (1974)
    Springer
    Annals of biomedical engineering 2 (1974), S. 90-105 
    Details
    ISSN: 1573-9686
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Computer-generated three-dimensional stereo images of the epicardial and endocardial surfaces of the left ventricle were displayed from data obtained with a biplane orthogonal roentgen video system. The silhouette of the opacified left ventricle was digitized from a video angiograph. The data were used to calculate the dynamic geometry of the ventricle and parameters such as curvature and stress. Continuous tone hidden surface displays of the ventricle were inscribed with isostress contours. The system is capable of obtaining biplane silhouettes of the ventricle at a rate of 60 pictures/sec. Dynamic displays of the beating ventricle can be obtained by recording sequential frames on a video disc recorder via a scan converter. The resulting sequence of frames can be played back in forward or reverse slow-motion or stop-action for detailed study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02368088
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  • 3
    Electronic Resource
    Electronic Resource
    Plane-strain finite-element analysis of reconstructed diastolic left ventricular cross section (1976)
    Springer
    Annals of biomedical engineering 4 (1976), S. 232-249 
    Details
    ISSN: 1573-9686
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The true shapes of cross sections of isolated left ventricles reconstructed from multiplanar roentgenographic recordings are analyzed using the finite-element method based on plane—strain theory. The proposed cylindrical model of the left ventricle permits variations of the stresses not only transversely throughout the ventricular walls but also circumferentially around the epicardial and endocardial surfaces to be evaluated. Numerical results are presented for cross sections at the midplane between the base and apex of the left ventricle during early and end diastole. For the anterior and posterior walls of the left ventricle, the maximum circumferential stresses are found to occur on the endocardial surface, whereas for the septal and free walls of the left ventricle, the maximum circumferential stresses occur on the epicardial surface with compressive circumferential stresses often developing on the endocardial surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000003
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Anatomic and kinematic analysis of the human forearm using high-speed computed tomography (1986)
    Springer
    Medical & biological engineering & computing 24 (1986), S. 164-168 
    Details
    ISSN: 1741-0444
    Keywords: Musculoskeletal kinematics ; Computerised tomography ; Forearm pronation supination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A new technique using computerised tomographic images was investi gated that allows a noninvasive description of the anatomy and kinematics of the human musculoskeletal system. These images were generated by the Dynamic Spatial Reconstructor, a high-speed CT scanner, with the ability to simultaneously scan multiple thin slices. Pronation/supination in a cadaveric forearn was used as the model for investigation. Three-dimensional shaded surface displays of the bony forearm were generated. These images are dimensionally accurate and allow the superposition of the results of mathematical modelling on the image for visual examination. The spatial location of bony markers was measured and calculated screw axis data superimposed on a computer generated surface display of the forearm skeleton. Applications of the technique include anatomic measurements not easily made with other systems, such as radial-ulnar interosseous distance as a function of forearm rotation and length and the amount of forearm rotation possible at various levels of forearm lengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02443930
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    Paper (German National Licenses)
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  • 5
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    Estrogen regulates the rate of bone turnover but bone balance in ovariectomized rats is modulated by prevailing mechanical strain (1997)
    National Academy of Sciences
    Details
    Publication Date: 1997-04-15
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 6
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    Roentgen video-absorptiometry (1974)
    Institute of Physics
    Details
    Publication Date: 1974-03-01
    Print ISSN: 0031-9155
    Electronic ISSN: 1361-6560
    Topics: Biology , Medicine , Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 7
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    Some effects of acceleration in man and chimpanzees (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Early physiologic experiments using dogs and humans in centrifuges are reviewed. Because of the close similarity between the shape and dimensions of the thoraces of chimpanzees and humans, the former were used to obtain roentgenograms and photokymographic recordings of multiple physiologic variables before and during exposure to +5.8 Gy to study the effects of changes in the gravitational-inertial force environment on the cardiovascular and pulmonary systems during long duration space flight. A computer-controlled sciscanning system was used to obtain a two dimensional map of the amount of radiation emanating from the dorsal and ventricle surfaces after insertion of radioactive microspheres in the right ventricle. By using four different batches of microspheres tagged with isotopes of different energies, the spatial distribution of pulmonary blood flow under four conditions was determined.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: NASA. Ames Res. Center The Use of Nonhuman Primates in Space; p 103-164
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Application of NASTRAN for stress analysis of left ventricle of the heart (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Knowing the stress and strain distributions in the left ventricular wall of the heart is a prerequisite for the determination of the muscle elasticity and contractility in the process of assessing the functional status of the heart. NASTRAN was applied for the calculation of these stresses and strains and to help in verifying the results obtained by the computer program FEAMPS which was specifically designed for the plane-strain finite-element analysis of the left ventricular cross sections. Adopted for the analysis are the true shape and dimensions of the cross sections reconstructed from multiplanar X-ray views of a left ventricle which was surgically isolated from a dog's heart but metabolically supported to sustain its beating. A preprocessor was prepared to accommodate both FEAMPS and NASTRAN, and it has also facilitated the application of both the triangular element and isoparameteric quadrilateral element versions of NASTRAN. The stresses in several crucial regions of the left ventricular wall calculated by these two independently developed computer programs are found to be in good agreement. Such confirmation of the results is essential in the development of a method which assesses the heart performance.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 201-219
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Biplane roentgen videometric system for dynamic, 60/sec, studies of the shape and size of circulatory structures, particularly the left ventricle. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An operator interactive video system for the measurement of roentgen angiographically outlined structures is described. Left ventricular volume and three-dimensional shapes are calculated from up to 200 pairs of diameters measured from ventriculograms at the rate of 60 pairs of biplane images per second. The accuracy and reproducibility of volumes calculated by the system were established by analysis of roentgenograms of inanimate objects of known volume and by comparison of left ventricular stroke volumes calculated by the system with the stroke volumes calculated by an indicator-dilution technique and an aortic root electromagnetic flowmeter. Computer-generated display of the large amounts of data obtained by the videometry system is described.
    Keywords: BIOTECHNOLOGY
    Type: American Journal of Cardiology; 32; Aug. 197
    Format: text
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  • 10
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    Liquid breathing - Prevention of pulmonary arterial-venous shunting during acceleration. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Dependent pulmonary atelectasis, arterial-venous shunting, and downward displacement of the heart caused by the gravitational-inertial force environment were prevented in dogs breathing oxygenated liquid fluorocarbon in a whole-body water-immersion respirator. Partial closure of the major airways during part of the expiratory phase of liquid respiration was a significant problem initially but was minimized in subsequent studies.
    Keywords: BIOSCIENCES
    Type: Journal of Applied Physiology; 32; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
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