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  • 1
    Electronic Resource
    Electronic Resource
    Laser Flash Photolysis and Matrix Isolation Studies of Ru[R2PCH2CH2PR2]2H2 (R = C2H5, C6H5, C2F5): Control of Oxidative Addition Rates by Phosphine Substituents (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 10047-10054 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00145a016
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  • 2
    Electronic Resource
    Electronic Resource
    STUDIES ON ADRENOCORTICOTROPIN. XIII. THE ISOLATION OF TWO HIGHLY ACTIVE BOVINE TYPES (1956)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 78 (1956), S. 4181-4182 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01597a100
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  • 3
    Electronic Resource
    Electronic Resource
    Distribution of electroreceptors, bioelectric field patterns, and skin resistance in the catfish,Ictalurus nebulosus LeS (1974)
    Springer
    Journal of comparative physiology 92 (1974), S. 11-22 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Three aspects of electroreception in catfish were investigated and discussed. 1) The distribution of the electroreceptive small pit organs over the skin was mapped (Fig. 2). Small pit organs occur all over the body with the exception of the barbels. The total number of small pit organs per fish has to be estimated at several thousands. 2) Some examples of the potential pattern of the bioelectric field ofIctalurus are given (Fig. 4, 5). It was found that the opening or closing of the mouth, and contractions of the anal sphincter result in variations in this bioelectricfield, that might be of significance in behaviour. 3) The skin resistance of catfish proved to be constant in electric fields from d.c. to 10 Hz, and to behave frequency dependent from 10 Hz upwards. The resistive behaviour of the fish's body varies with the direction of the body axes. In dorso-ventral direction the insulating properties of the body are greatest, which suggest a greater electro-sensitivity in this direction than in others (Fig. 6, 7). The relatively small deformation of external homogeneous a.c. fields, caused by the insulating character of the swim bladder, suggests that a subdermal conductive layer screens the inner structures and might function as a potential reference.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696523
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  • 4
    Electronic Resource
    Electronic Resource
    Electro-orientation in the passive electric catfish,Ictalurus nebulosus LeS (1974)
    Springer
    Journal of comparative physiology 92 (1974), S. 273-280 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary By means of conditioning experiments it was demonstrated in the laboratory that catfish show compass-orientation using more or less homogeneous, horizontally directed electric fields. Similar fields occur in their habitat. Evidence was found for the supposition that this kind of electro-orientation occurs spontaneously under natural circumstances. The lowest current density (horizontal d.c. field) in which the catfish showed orientation behaviour proved to be 8 × 10−12A/mm2 in water with a specific resistivity of 25 Ohm·m.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696615
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  • 5
    Electronic Resource
    Electronic Resource
    Flux measurement in single cells by fluorescence microphotolysis (1984)
    Springer
    European biophysics journal 11 (1984), S. 43-50 
    Details
    ISSN: 1432-1017
    Keywords: Flux measurement ; photobleaching ; fluorescence microphotolysis ; erythrocyte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Fluorescence microphotolysis — widely employed for diffusion studies — can be used to measure transfer (flux) of fluorescent solutes through membranes in single cells and organelles. This article analyses the methodological basis of flux measurements, provides experimental tests, and discusses potential applications. The principle of the method is to equilibrate cells, organelles or vesicles with a fluorescent solute, to deplete the interior of individual cells etc. of fluorescene by the pulse of a high-intensity microbeam, and to monitor influx of solute by microfluorometry. Simple equations are given and a computer curve fitting program is described by which rate constants of influx and membrane permeability coefficients can be derived from fluorescence measurements. The permeability of individual “leaky” human erythrocyte ghosts to fluorescein-isothiocyanate-labelled bovine serum albumin has been measured under various conditions. Multiple exposure to the high-intensity microbeam had no effect on permeability within experimental error. Flux measurements have been also performed on individual vesicles of 1–2 μm radius which had been derived from ghosts. The potential application of the method to sub-lightmicroscopic vesicles and to organelles within living cells is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00253857
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  • 6
    Electronic Resource
    Electronic Resource
    Single-cell flux measurement by continuous fluorescence microphotolysis (1985)
    Springer
    European biophysics journal 13 (1985), S. 37-44 
    Details
    ISSN: 1432-1017
    Keywords: Fluorescence microphotolysis ; photobleaching ; flux measurement ; erythrocyte membrane ; anion transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Continuous fluorescence microphotolysis (CFM) was adapted to flux measurements in single cells. The principle of the method is simple: Cells are equilibrated with a fluorescent solute, an individual cell is continuously irradiated by a laser beam focussed down to approximately the diameter of the cell, and fluorescence originating from the irradiated cell is monitored. In this procedure irradiation irreversibly photolyzes chromophores in the cell while fresh chromophores enter the cell by membrane transport (flux). The resulting fluorescence decay can be analyzed for the rate constants of both membrane transport and photolysis. As an experimental test of the new method the band-3 mediated transport of the fluorescent anion N-(7-nitrobenzofuranzan-4-yl)-taurine (NBD-taurine) across the erythrocyte membrane was measured. For various experimental conditions good agreement between values obtained by CFM and by fluorescence microphotolysis (FM) was observed. By measurements on single ghosts it was furthermore found that photolysis of NBD-taurine is first-order with respect to the power of irradiation. On this basis a stepped-intensity procedure was worked out that facilitates data evaluation in flux measurements. Also, by analysing the relations between CFM and FM flux measurements a method was devised by which FM data can be corrected for (inevitable) photolysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266308
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  • 7
    Electronic Resource
    Electronic Resource
    COMPOSITION AND PHYSIOLOGY OF Monstera deliciosa FRUIT AND JUICE (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 42 (1977), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Fruit of the tropical vine Monstera deliciosa undergo a pronounced climacteric during ripening with the concomitant large increase in ethylene production. The ripe fruit contains 19.1% soluble solids and 0.41% oxalic acid; the juice is considered safe for human consumption with respect to the levels of saponin, hydrocyanic acid and oxalic acid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1977.tb12687.x
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  • 8
    Electronic Resource
    Electronic Resource
    Equilibria in Water–Alcohol Mixtures (1963)
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 692-693 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Caldin and Long1 have reported investigations on ethanol–water mixtures containing sodium hydroxide in which TNT was used as an indicator. The purple colour obtained is supposedly due to the TNT anion produced by the equilibria: BH + OH- ^ B- + H20 (J3H- = TNT) BH + OEt- ^ B- ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/199692a0
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  • 9
    Electronic Resource
    Electronic Resource
    Vitamin B 4 and Adenine (1933)
    [s.l.] : Nature Publishing Group
    Nature 131 (1933), S. 617-618 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN a recent preliminary communication, R. Tschesche1 has directed attention to the similarity between adenine hydrochloride and the crystals isolated by Barnes, O'Brien and Reader2. These crystals were specifically stated by them to have vitamin B4 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/131617b0
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  • 10
    Electronic Resource
    Electronic Resource
    Adsorption of Weak Electrolytes on Charcoal (1932)
    [s.l.] : Nature Publishing Group
    Nature 129 (1932), S. 939-939 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WE wish to direct attention to two recent statements about our experiments, which may be misleading if left without comment. In a paper describing results of wide biological significance, Ockrent 1 has suggested, as an interpretation of our results, that in accordance with his theory of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/129939a0
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