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  • 1
    Electronic Resource
    Electronic Resource
    Psychology in the German Democratic Republic (1980)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Psychology 31 (1980), S. 195-209 
    Details
    ISSN: 0066-4308
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Psychology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ps.31.020180.001211
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Atopic dermatitis and congenital deafness (1978)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 99 (1978), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In a family with perceptive, non-progressive hearing loss several of the members suffered from atopic dermatitis. The proband had a severe atopic dermatitis and an extremely high IgE value. Some of the family members suffered from atopic dermatitis, others from deafness, and some from both diseases. The co-existence of these two disorders has been previously described in two families. Atopic dermatitis and perceptive, non-progressive congenital deafness might be genetically associated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1978.tb02004.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Allergic contact dermatitis from croton (Codiaeum) (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 3 (1977), S. 0 
    Details
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0536.1977.tb03609.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Petechial reaction following patch testing with cobalt (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 6 (1980), S. 0 
    Details
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A total of 132 patch tested patients reacted with petechial reactions to cobalt chloride 1 % in petrolatum; 23 were retested with various concentrations of cobalt. In about 60% of those retested the petechial reaction could be reproduced. Histopathological examination showed slight perivascular tymphocytic infiltration, swollen endothelium and extravasation of erythrocytes but no signs of vasculitis.It is suggested that in predisposed patients the petechial reaction following patch testing could be the result of primary irritation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0536.1980.tb03913.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Contractile responses to direct stimulation of frog slow muscle fibres before and after denervation (1979)
    Springer
    Pflügers Archiv 382 (1979), S. 43-50 
    Details
    ISSN: 1432-2013
    Keywords: Slow fibres ; Contractile responses ; Effect of denervation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract 1. The contractile responses of single slow muscle fibres were investigated under isometric conditions. The fibres were isolated from normal and denervated iliofibularis muscles ofRana temporaria. Direct stimulation was achieved by external application of electrical pulses or depolarizing solutions (40 mM K and acetylcholine 10\t-6 g/ml). 2. Upon electrical stimulation normal slow fibres developed contractions whose amplitude increased steadily with the strength of the pulses. These contractions did not exceed 0.22 kg/cm2, and their rates of rise and fall were approximately 1/6 of those observed in twitch fibres. During pulses of several 100 ms duration the tension continued to rise slowly until the end of the pulses. Application of 40 mM K or acetylcholine resulted in contractures which reached maximum values of 1.71 and 1.87 kg/cm2, respectively, after less than 1 min; little relaxation occurred during the following minutes. 3. The responses of slow fibres denervated for 9−76 days differed in several respects from those of normal slow fibres. a) The contractions elicited by electrical stimulation became faster but their amplitude decreased; the relationship between tension and pulse strength remained, however, essentially unchanged. b) Small and short contractions could be observed during and at the end of stimulating current pulses. Their amplitude was independent of the amplitude and duration of the stimuli; they were blocked by tetrodotoxin and must be attributed to action potentials. c) The ability to develop and maintain tension was reduced. Maximum values of K- and acetylcholine contractures were generally only 50% of those observed in normal slow fibres. Maintenance of tension was markedly reduced in some fibres, less so in others. 4. It is concluded that incorporation of Na channels into its membrane does not transform the slow fibre into a type of fibre which resembles a twitch fibre.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00585902
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Distribution of acetylcholine-sensitivity in frog slow muscle fibres (1983)
    Springer
    Pflügers Archiv 397 (1983), S. 300-305 
    Details
    ISSN: 1432-2013
    Keywords: Slow muscle fibres ; ACh ; Sensitivity ; Distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract 1) The distribution of acetylcholine-sensitive membrane areas in slow muscle fibres of pyriformis muscles of Rana temporaria was examined by iontophoretic application of acetylcholine from high resistance pipettes. 2) ACh-sensitivity varied considerably along individual slow fibres and from fibre to fibre. In some fibres the sensitivity was restricted to segments of less than 100 μm, in others it was continuous over several millimeter. Segments of variable length, but up to several millimeter, were completely insensitive to acetylcholine. Highly sensitive spots (〉1,000 mV/nC) were found occasionally, their diameter being of the order of 10–20 μm only. The occurrence at rather regular intervals of ACh-sensitive areas was a rare observation; no evidence was found for a generalized ACh-sensitivity. 3) There were marked differences in the lengths of ACh-sensitive segments between surface fibres and fibres located in deeper layers of the muscles. 4) It is concluded that the ACh-sensitive membrane areas correspond to individual nerve muscle contacts of the small motor system whose spatial distribution is extremely variable. In superficial slow fibres the synaptic contacts seem to be located predominantly on the internal circumference of the fibres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00580265
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Fine structure of isolated and non-isolated potato tuber periderm (1982)
    Springer
    Planta 154 (1982), S. 76-80 
    Details
    ISSN: 1432-2048
    Keywords: Cell wall (potato) ; Periderm ; Solanum (periderm) ; Suberin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cell walls of the periderm of native potato tuber (Solanum tuberosum L. cv. Primura) consist of a primary wall, a suberized secondary wall and a tertiary wall. With a mixture of pectinase and cellulase intact periderm membranes can be isolated. Isolation does not affect fine structure. It is suggested that the lignin in the middle lamellae and primary walls prevents the enzymes from digesting pectinaceous materials and cellulose. In specimens fixed with OsO4, the suberized walls appear as alternating electrondense and electron-lucent lamellae. This lamellar architecture is not altered by extraction with chloroform. Therefore, the current view that the electronlucent lamellae consist of soluble lipids (waxes) can no longer be maintained. It is argued that the lamellation is a property of the suberin itself, and the suberized wall consists of alternating layers of suberins differing in polarity. A hypothesis of suberin assembly from sub-units is advanced and the subunits are shown for the first time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385500
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of nerve length and temperature on the induction of action potentials in denervated slow muscle fibres of the frog (1977)
    Springer
    Pflügers Archiv 372 (1977), S. 17-22 
    Details
    ISSN: 1432-2013
    Keywords: Slow muscle fibres ; Action potential ; Nerve stump ; Temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A. Pyriformis and extensor longus digiti IV muscles of Rana temporaria were denervated by cutting the sciatic or peroneal nerve at various distances from the muscles. Slow fibres were identified by their membrane time constants, and examined for their ability to produce action potentials in response to intracellularly applied current pulses. B. The slow muscle fibres acquired the ability to generate action potentials several days after denervation. The duration of this latent period depended on the length of the peripheral nerve stump, and on the temperature at which the frogs were kept after the operation. C. At 18°C the latent period increased by 0.36 days per mm of sciatic nerve stump. At 11.5° C the corresponding value was 0.7 days/mm. The effect of length of the peroneal nerve was smaller than that of the sciatic nerve. D. It is suggested that the peripheral nerve stump serves as a reservoir of ‘trophic’ material which is transported towards the slow fibres at a rate of 2.8 mm/day (at 18° C) and seems to block the formation of Na channels. TheQ 10 value of this transport system would be 2.7.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00582201
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  • 9
    Electronic Resource
    Electronic Resource
    Changes in envelope permeability during chloroplast development (1976)
    Springer
    Planta 129 (1976), S. 69-73 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The permeability of the plastid envelope during the development of Avena sativa plastids was investigated by light scattering and uptake of various labelled compounds (malate, succinate, glutamate, α-ketoglutarate, citrate, glycine, sucrose). The results presented show that a primary event during greening is a change in permeability, thereby allowing an increased transport of metabolites across the membranes of very early etio-chloroplast stages. The results are discussed in view of an adaption of the plastid envelope permeability to the changing requirements of externally synthesized precursors and intermediates during development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390916
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Water permeability of periderm membranes isolated enzymatically from potato tubers (Solanum tuberosum L.) (1983)
    Springer
    Planta 158 (1983), S. 294-301 
    Details
    ISSN: 1432-2048
    Keywords: Periderm membranes ; Solanum, periderm ; Suberin ; Tuber ; Water permeability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The fine structure and water permeability of potato tuber periderm have been studied. Periderm membranes (PM) were isolated enzymatically using pectinase and cellulase. They were composed of, about six layers of phellem cells arranged in radial rows. The walls of phellem cells consist of cellulosic primary and tertiary walls and suberized secondary walls which are lamellated. Middle lamellae and primary walls contain lignin. Since the PM did not disintegrate during enzymatic isolation it appears that lignin also extends into the secondary suberized walls. The water permeability of PM was low, ranging from 1–3·10-10 m s-1. This low water permeability developed only during storage of tubers in air. Periderm membranes from freshly harvested tubers had a relatively high permeability. The low permeability of PM from stored tubers is attributed to soluble lipids associated with suberin since: (1) extraction of soluble lipids from PM increased permeability by more than 100-fold, (2) a phase transition of soluble lipids was observed between 46 and 51° C, and (3) only the permeability of PM decreased during storage while the permeability of extracted PM remained unchanged. Evidence is presented that two pathways for water movement exist in parallel. Pathway 1 is represented by middle lamellae and primary walls extending in radial direction across the membranes. This pathway has a relatively high specific permeability. Pathway 2 is represented by a polylaminated structure made up of tangential walls of phellem cells which are orientated normal to the direction of water flow. This pathway has a low specific permeability because of the properties of secondary walls incrusted with soluble lipids. It is calculated that about 10% of the water flows across pathway 1 and 90% across pathway 2 which has a volume fraction of 0.995.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397330
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