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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
    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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  • 3
    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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  • 4
    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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  • 5
    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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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Development of plant cuticles: occurrence and role of non-ester bonds in cutin of Clivia miniata Reg. leaves (1982)
    Springer
    Planta 156 (1982), S. 380-384 
    Details
    ISSN: 1432-2048
    Keywords: Clivia ; Cuticle (fine structure and development) ; Cutin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of BF3-methanol treatment on the mass and fine structure of isolated Clivia leaf cuticles at different stages of development has been investigated. BF3-methanol cleaves ester linkages in cutin; however, the cuticles are not completely depolymerized. With increasing age, the residue left after BF3-methanol treatment increases in mass. In very young cuticles, 10% of the total cutin resisted BF3-methanol and the fraction of nonester cutin increased up to 62% in mature leaves. Transmission electron microscopy shows that fine structure of the cuticle proper is severely distorted but not destroyed. The internal cuticular layer, which exhibits a heavy contrast when fixed with KMnO4, is completely depolymerized, while the external cuticular layer is hardly affected. The results are discussed in relation to cuticle development and to the function of cuticles as transpiration resistances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397478
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  • 7
    Electronic Resource
    Electronic Resource
    Fine structure of plant cuticles in relation to water permeability: The fine structure of the cuticle of Clivia miniata reg. leaves (1981)
    Springer
    Planta 152 (1981), S. 259-267 
    Details
    ISSN: 1432-2048
    Keywords: Clivia ; Cuticle development and fine structure ; Water permeability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The fine structure of the upper cuticular membrane (CM) of Clivia miniata leaves was investigated using electron microscopy. The CM is made up of a thin (130 nm) lamellated cuticle proper (CP) and a thick (up to 7 μm over periclinal walls) cuticular layer (CL) of marbled appearance. Evidence is presented to show that the electron lucent lamellae of the CP do not simply represent layers of soluble cuticular lipids (SCL). Instead, the lamellation is probably due to layers of cutin differing in polarity. It is argued that the SCL in the Cp are the main barrier to water. Thickening of the CM during leaf development takes place by interposition of cutin between the CM and the cellin wall. The cutin of young, expanding leaves has a high affinity for KMnO4 and is therefore relatively polar. As leaves mature, the external CL underneath the CP becomes non-polar, as only little contrast can be obtained with permanganate as the post fixative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385154
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  • 8
    Electronic Resource
    Electronic Resource
    The pathogenesis of trypanosomiasis of the CNS (1983)
    Springer
    Virchows Archiv 399 (1983), S. 333-343 
    Details
    ISSN: 1432-2307
    Keywords: African trypanosomiasis ; Involvement of CNS ; Pathogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Parasitological examinations of the cerebrospinal fluid of 20 vervet monkeys (Cercopithecus aethiops), that had been infected with Trypanosoma rhodesiense, revealed that the CSF was regularly infested with trypanosomes in the early phase of the disease, at the earliest on the 13th day, in most of the animals in the 3rd or 4th week, after infection. Follow-up examinations of the CSF during the further course of the disease also regularly proved positive for trypanosomes. Histological studies in the animals that died at a mean of 65 days after infection (range 35 to 107 days) revealed encephalitis in the animal with the longest course of the disease. In all the other animals, meningitis alone was found. This was accompanied by a modified early encephalitic reaction, characterized by lympho-plasma-cellular infiltrates exclusively in the adventitial sheaths of those blood vessels passing into the brain from the leptomeninges affected by inflammatory infiltration. The early encephalitic reaction is interpreted as the morphological manifestation of an infestation of the perivascular spaces (Virchow-Robin spaces) with parasites. It indicates that CSF parasitosis in the early phase represents the point of departure for the encephalitis that develops in the late phase of the disease, and that the encephalitis presumably develops as a result of the migration of the trypanosomes out of the subarachnoid space into the perivascular spaces, and from there into the brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00612951
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  • 9
    Electronic Resource
    Electronic Resource
    Ultrastruktur der diabetischen autonomen Neuropathie des Gastrointestinaltraktes (1984)
    Springer
    Journal of molecular medicine 62 (1984), S. 399-405 
    Details
    ISSN: 1432-1440
    Keywords: Electronmicroscopy ; Diabetes mellitus ; Autonomic polyneuropathy ; Gut
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Gastrointestinal motility disorders induced by diabetes mellitus are most commonly manifested in the colon, and are considered to be an expression of diabetic autonomic polyneuropathy. In this study, for the first time, the intrinsic nervous system of the bowel has been subjected to an ultrastructural and morphometric examination in rectal biopsy material obtained from diabetics with and without diabetic enteropathy. In patients with diabetic enteropathy, the nerves of the submucous plexus (Meissner's plexus) revealed significant swelling of the axons, as an expression of neural degeneration. Furthermore, in about a half of these patients, thickening of the basal membrane of Schwann's cells was also detected. Additional, although unspecific, changes found in the diabetics were a quantitative increase in the lysosomes, lipofuscin and glycogen in the Schwann cells. The ultrastructural findings represent evidence for the presence of an intrinsic autonomic polyneuropathy in diabetics with diabetic enteropathy. At the same time, they indicate that the diagnosis of diabetic enteropathy is no longer merely an “exclusion” diagnosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01742296
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    2,3,4-Tri-O-acetyl-α-D-xylopyranosylfluorid bei 115 K und 295 K (1982)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 2732-2735 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740882009790
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    Paper (German National Licenses)
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