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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 211 (1966), S. 754-755 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The tecto-tegmental region of mammals receives an extensive innervation from the neo-cortex3-5 and a question that remains is whether this structure must be present for habituation to occur in the tecto-tegmental cells. This question is answered in the experiments described here. Five rabbits ...
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 223 (1969), S. 534-535 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Six batches of Chunky chicks were hatched and kept in a dark incubator until the start of the experiment. Because the readiness with which birds can be imprinted is dependent on maturational age4'6, half the chicks were drawn from the early part of the hatch and half from the late part. The early ...
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 210 (1968), S. 70-79 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A description of preparation for samples of niobium nitride without and with admixtures of titanium, zirconium and tantalum by diffusion of nitrogen under pressure into niobium wires without and with admixtures of titanium, zirconium and tantalum respectively, is given. For samples of pure niobium nitride with different compositions the influence of the nitrogen content on the transition temperature to superconductivity has been investigated with the result of a transition temperature not exceeding 16.5 °K even for the stoichiometric composition NbN. This is in contrary to other authors. For diffusion wires of the systems (Nb-Ti)N x , (Nb-Zr)N x and (Nb-Ta)N x the critical temperature, lattice parameter and nitrogen content as a function of the admixture of titanium, zirconium and tantalum respectively, are given. For the first time the magnetisation curve of niobium nitride has been measured showing the behaviour of type II superconductors. Concerning the kinetics of formation of niobium nitride by diffusion the nitrogen content is increasing for constant nitrogen pressure with raising temperature of diffusion, but is decreasing in the high temperature region.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 194 (1966), S. 219-223 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The equilibrium betweenF- andM-center concentration in KCl after X-irradiation at temperatures between 77 °K and 298 °K has been studied. At low temperatures (〈200 °K) onlyF-centers which are formed statistically as nearest neighbours give aM-center. At higher temperaturesF-centers within a certain sphere of interaction with a radiusr formM-centers. The temperature dependance of this radiusr has been evaluated. The equilibrium constantK depends on the temperature in the form K=K0exp(-Q/kT). The activation energy was determined to be Q=(0.5±0.1) eV.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 1 (1969), S. 29-43 
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Critical field curves and quenching curves for a variety of type II superconductors of B1 (NaCl type) and A15 (β-W type) compounds have been measured. The critical field curves have been evaluated for the pertinent parameters of type II super-conductivity. Comparison of the shape of the critical field curves and their initial slope with recent theories by Helfand and Werthamer results in a good agreement.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 4 (1966), S. 205-208 
    ISSN: 1741-0444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 4 (1966), S. 315-315 
    ISSN: 1741-0444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Annals of biomedical engineering 12 (1984), S. 151-162 
    ISSN: 1573-9686
    Keywords: Matching ; Cardiac pump function ; Power ; Apparent source resistance ; Peripheral resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract We have studied the interrelation of left ventricle and arterial system in the anesthetized open-thorax cat. The ventricle was characterized by its pump function graph, relating mean ventricular pressure ( $$\bar P_{lv}$$ ) and mean aortic flow ( $$\bar F$$ ). The pump function graph was determined by means of an artificial periphery and on a beat-to-beat basis. The periphery was characterized by relating mean aortic pressure ( $$\bar P_{ao}$$ ) and mean flow. Mean aortic and mean left ventricular pressure could be related over a wide range of values by a proportionality factor $$\bar P_{ao} = a \cdot \bar P_{lv}$$ . In a series of five separate experiments a value of a=1.72±0.14 (mean±SD) was found. This simplified relation allows direct comparison of apparent source resistance (i.e., slope of pump function graph), (Rs), and peripheral resistance (Rp). It was also found experimentally that total external power ( $$\bar \dot w$$ ) could be calculated from mean aortic pressure and mean flow as well as from mean left ventricular pressure and mean flow (thus from the pump function graph) by $$\bar \dot w = c \cdot \bar P_{ao} \cdot \bar F = c \cdot a \cdot \bar P_{lv} \cdot \bar F$$ . The value of c=1.16±0.12 (mean±SD, n=4). Maximum external power was predicted for $$R_p /R_s = \bar P_{ao} /\bar P_{lv} = a$$ . In six different cats Rp/Rs ratio in the working point (i.e., mean left ventricular pressure and mean flow when the normal periphery loaded the heart) was found to be Rp/Rs=2.63±0.92. This value could not be shown to differ from that in the point where maximal external power was found, i.e., Rp/Rs=1.81±0.08 (n=6).
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 3 (1965), S. 239-248 
    ISSN: 1741-0444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire L’emploi d’une micro-électrode extra-cellulaire dans l’enregistrement de la décharge des pulsions nerveuses permet de détecter plusieurs groupes de potentiels d’activité nerveuse à partir d’un point unique d’enregistrement. On décrit ici un appareil pouvant enregistrer jusqu’à 3 groupes simultanément et fixer les valeurs obtenues par perforation d’une bande de papier, à la cadence d’au moins 9 msec. Le procédé permet également de coder les périodes vides de toute impulsion ou stimulation. Ceci a pour effet de réduire considérablement le temps nécessaire au transfert de l’information de la bande perforée à la bande d’entrée.
    Abstract: Zusammenfassung Registriert man die Entladung von Nervenimpulsen mit einer extra zellulären Mikroelektrode, so kann man von einem Ableitepunkt gleichzeitig mehrere Sätze von Aktionspotentialen erhalten. Ein Apparat wird beschrieben, der bis zu drei solcher Sätze registrieren kann und alle 9 Millisekunden (oder weniger) die entsprechenden Werte auf Lochstreifen druckt. Der Apparat kodiert dabei die Länge der von Impulsen oder Stimuli freien Intervalle. Auf diese Weise wird die Einlesezeit vom Lochstreifen in die Rechenmaschine erheblich verkürzt.
    Notes: Abstract If the discharge of nerve impulses is recorded by an extra-cellular micro-electrode, more than one set of action potentials may be detected simultaneously from one recording point. A machine is described which can count up to three such sets and, every 9 msec or less, punch the value of these counts onto paper tape. The machine employs a procedure to code the lengths of periods during which there are no impulses or stimuli. As a result, the amount of time spent reading the paper tape into the computer is greatly reduced.
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  • 10
    Publication Date: 1983-11-01
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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