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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 150 (1991), S. 859-859 
    ISSN: 1432-1076
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 150 (1991), S. 503-506 
    ISSN: 1432-1076
    Keywords: Dopamine infusion ; Newborn infants ; Plasma catecholamines ; Noradrenaline ; Adrenaline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Newborn infants (21 preterm and 13 term) received dopamine infusions at a low (2.5–3.4 μg/kg per min) and/or high (5–10 μg/kg per min) infusion rate and changes in plasma catecholamines were monitored. The mean baseline values for dopamine, noradrenaline and adrenaline were between 240 and 560, 125 and 144 and 62 and 82 pg/ml, respectively. During low-rate infusion of dopamine, there was a significant increase in plasma dopamine (20–100fold), noradrenaline (three- to five-fold) and adrenaline (threefold). Administration of dopamine at the high rate resulted in an even larger increase in the plasma catecholamines (dopamine, 100–300fold; noradrenaline, seven- to eightfold; adrenaline, four- to sixfold). In a double-log plot, there was a highly significant correlation between the plasma concentrations of dopamine and noradrenaline (r=0.77;P〈0.001). In conclusion, infusion of dopamine in term and preterm newborn infants is accompanied by an enhanced sympatho-adrenal tone which may contribute to the cardiovascular effects of dopamine in these patients.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European biophysics journal 20 (1991), S. 101-107 
    ISSN: 1432-1017
    Keywords: Euglena gracilis ; Gravitaxis ; Image analysis ; Microgravity ; NIZEMI (slow rotating centrifuge microscope) ; Velocity of movement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Motility and orientation has been studied in the unicellular photosynthetic flagellate, Euglena gracilis, using real time image analysis capable of tracking up to 200 cells simultaneously in the slow rotating centrifuge microscope (NIZEMI) which allows one to observe the cells' swimming behavior during centrifugation accelerations between 1 g and 5 g. At 1 g the cells show a weak negative gravitaxis, which increases significantly at higher accelerations up to about 3 g. Though most cells were capable of swimming even against an acceleration of 4.5 g, the degree of gravitaxis decreased and some of the cells were passively moved downward by the acceleration force; this is true for most cells at 5 g. The velocity of cells swimming against 1 g is about 10% lower than that of cells swimming in other directions. The velocity decreases even more drastically in cells swimming against higher acceleration forces than those at 1 g. The degree of gravitactic orientation drastically decreases after short exposure to artificial UV radiation which indicates that gravitaxis may be due to an active physiological perception rather than a physical effect such as an asymmetry of the center of gravity within the cell.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 16 (1993), S. 0 
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Secondary carotenoids are suspected to modulate photomovement in Haematococcus lacustris [Girod] Rostafinski (Volvocales). To investigate the influence of these extrachloroplastic ketocarotenoids on phototactic and photophobic responses in the flagellate stage of the green alga, flagellate suspensions differing in the content of secondary carotenoids were grown from green and red aplanospores. Photo-orientation of these flagellates induced by unilateral irradiation was investigated using a computer-aided system for microscopic image analysis. Results were hypothetically summarized as follows:(1) Diminution of precision of the positive phototaxis was found in red flagellates. This might be due to cellular shading of the blue-light-sensitive photoreceptor by secondary carotenoids.(2) Red flagellates exhibited an increase in the photophobic response. This finding is discussed in relation to an adaptive increase of the photoreceptor sensitivity, thought to be a result of the higher optical density of the corresponding cell suspension in the blue wavelength region.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 4 (1990), S. 0 
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Yeast cells produce a set of enzymes which are involved in the metabolism of phosphate, and include acid and alkaline phosphatases as well as permeases. Most of these enzymes are synthesized in response to the presence or absence of inorganic phosphate. In the past few years a considerable amount of genetic and molecular evidence has accumulated and a rather precise overall picture emerges which describes the mechanism of phosphate control at the level of gene activation. This mini-review summarizes these data. The main focus lies on the regulatory features associated with the control of transcription of PH05, a gene coding for most of the regulated acid phosphatase activity produced by yeast cells.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 281-282 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Schematic diagram of a tapered light guide. The beam is propagated from the right to the left. The measurements are given in Table 1 Table 1. MEASUREMENTS OP THE TAPERED GUIDES No. Type a* b c d e / g (mm) 1 Glass rod 75 32 21 3-0 0-9 _ 2 148 34 ...
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: For column chromatography of dissolved materials silica gel preparations with systematically changed space structure are used. Differences of space structure are characterised by a distinctive parameter of space structure, the specific pore volume.Separations are described which are no longer effected by differentiated chemical reactions of the dissolved materials with the silica gel surface, but only by a differentiated distribution of the larger and smaller particles of the dissolved materials between the mobile phase of the solvent and the quasi-stationary phase of this solvent within the wide pores of the silica gel granules.Separations were made of the following material systems:Thorium oxide sol/Cl ions (using water as solvent), styrene/polystyrene (using benzene or chloroform as solvent), paraffin/polystyrene (using chloroform as solvent). Polystyrene as a mixture of polymeric homologues of the mean molecular weight 38,000 or 250,000 is fractionated. In the successive fractions the mean molecular weight decreases.
    Notes: Für die Sälenchromatographie gelöster Stoffe werden Silicagelpräparate mit systematisch abgeänderter Hohlraumstruktur eingesetzt. Unterschiede der Hohlraumstruktur werden durch einen besonders hervortretenden Parameter der Hohlraumstruktur, das spezifische Porenvolumen, gekennzeichnet.Es werden Trennungen beschrieben, die nicht mehr auf differenzierten chemischen Reaktionen der gelösten Stoffe mit der Oberfläche des Silicagels, sondern nur noch auf einer differenzierten Verteilung der größeren und kleineren Teilchen der gelösten Stoffe zwischen der mobilen Phase des Lösungsmittels und der quasi-stationären Phase desselben Lösungsmittels in den weiten Poren der Silicagelkörner beruhen.Trennungen werden ausgeführt an den Stoffsystemen:Thoriumoxidsol/Cl-lonen (mit Wasser als Transportflüssigkeit), Styrol/Polystyrol (mit Benzol bzw. Chloroform als Transportflüssigkeit), Paraffin/Polystyrol (mit Choroform als Transportflüssigkeit). Polystyrol als Gemisch von Polymerhomologen mit dem mittleren Molekulargewich 38000 bzw. 250000 werden fraktioniert. In den aufeinanderfolgenden Fraktionen nimmt das mittlere Molekulargewicht ab.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 80 (1968), S. 359-360 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 7 (1968), S. 371-372 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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