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  • Springer  (4)
  • 1985-1989  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Analysis of growth patterns during gravitropic curvature in roots ofZea mays by use of a computer-based video digitizer (1986)
    Springer
    Journal of plant growth regulation 5 (1986), S. 73-83 
    Details
    ISSN: 1435-8107
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A computer-based video digitizer system is described which allows automated tracking of markers placed on a plant surface. The system uses customized software to calculate relative growth rates at selected positions along the plant surface and to determine rates of gravitropic curvature based on the changing pattern of distribution of the surface markers. The system was used to study the time course of gravitropic curvature and changes in relative growth rate along the upper and lower surface of horizontally-oriented roots of maize (Zea mays L.). The growing region of the root was found to extend from about 1 mm behind the tip to approximately 6 mm behind the tip. In vertically-oriented roots the relative growth rate was maximal at about 2.5 mm behind the tip and declined smoothly on either side of the maximum. Curvature was initiated approximately 30 min after horizontal orientation with maximal (50°) curvature being attained in 3 h. Analysis of surface extension patterns during the response indicated that curvature results from a reduction in growth rate along both the upper and lower surfaces with stronger reduction along the lower surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02025958
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nonselective ionic channels inAplysia neurones (1986)
    Springer
    The journal of membrane biology 93 (1986), S. 75-83 
    Details
    ISSN: 1432-1424
    Keywords: single channel ; chloride ; selectivity ; conductance state ; Aplysia neurones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Single-channel recordings from outside-out patches ofAplysia neurones in K-free solutions revealed the presence in most membrane patches of ionic channels showing surprising selectivity properties, as deduced from reversal potential measurements. After complete substitution of external NaCl by mannitol (in the presence of internal CsCl), these channels are more permeable to Cl than to Cs, but are also slightly permeable to Cs:P Cl/P Cs=4. Furthermore, in the presence of external NaCl, their ability to discriminate cations from anions seems lower than in external mannitol. Substitutions of external Cl by various anions showed that the channels are more permeable to NO3 than to Cl, and that they are appreciably permeable to isethionate, SO4 and methanesulfonate. Their elementary conductance is about 100 pS in 600mm symmetrical Cl. However, different conductance states (usually 2 or 3) can often be detected in the same membrane patch. By using voltage ramps, we established theI–V curves corresponding to each of these states and found small but significant differences between the reversal potentials of each state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01871020
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Plasma fluorescein and fluorescein glucuronide in patients with selected eye diseases (1989)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 227 (1989), S. 114-117 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Systemically administered fluorescein (F) is rapidly transformed to the fluorescent metabolite fluorescein glucuronide (FG). Little is known about how diseases can influence the synthesis or disposition of FG. We studied F and FG in the plasma ultrafiltrate of 75 people who were normal or had diabetes, retinitis pigmentosa, or idiopathic rhegmatogenous retinal detachment. F and FG were determined by high-performance liquid chromatography. The concentration of FG was comparable to F 1 h after an intravenous injection of F, both in normal subjects and in patients with retinitis pigmentosa, which suggests that FG may not be an important contributor to the vitreous fluorescence at that time. At later times FG substantially exceeded F. The concentration of FG was significantly higher in diabetics than in the other groups 14 h after an oral dose of F. Accordingly, the possible effect of disease on plasma dye concentrations should be considered in studies measuring F by fluorescence hours after systemic F administration, since this could influence the intraocular fluorescence irrespective of any alteration in ocular function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02169781
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Emotional stress and diabetic control: A postulated model for the effect of emotional distress upon intermediary metabolism in the diabetic (1985)
    Springer
    Applied psychophysiology and biofeedback 10 (1985), S. 241-254 
    Details
    ISSN: 1573-3270
    Keywords: stress ; diabetes ; diabetic control ; stress and diabetes ; intermediary metabolism ; stress and intermediary metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The findings of a number of clinical investigators across a wide variety of situations and using a wide variety of observational procedures agree on the disruptive effects of emotional distress upon diabetic control. An integrative model of coordinated neural and hormonal reactions to emotional stress and their additive and potentiating effects on intermediary metabolism in proposed. The end result of these effects, as part of a general fight/flight or defense-alarm reaction, is a strong energy mobilization response (namely, a sharp rise in blood glucose and free fatty acid levels resulting in increased levels of serum cholesterol, triglycerides, and ketone bodies), which the diabetic cannot readily counterregulate. It is further proposed that increased diabetic control, together with lower insulin requirements, may result from the inclusion of stress management procedures as an adjunct to traditional medical treatment. The findings of a large number of investigators supporting these propositions are presented and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00999345
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    Paper (German National Licenses)
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