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  • 1
    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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  • 2
    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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  • 3
    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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  • 4
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    Thomas Luckmann: Lebenswelt und Gesellschaft (Book Review) (1982)
    Berlin : Periodicals Archive Online (PAO)
    Deutsche Zeitschrift für Philosophie. 30:11 (1982) 1416 
    Details
    ISSN: 0012-1045
    Topics: Philosophy
    Notes: REZENSIONEN
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4085-1982-030-11-000015
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  • 5
    Electronic Resource
    Electronic Resource
    Die Cnidogenese der Octocorallia (Anthozoa, Cnidaria): II. Reifung, Wanderung und Zerfall von Cnidoblast und Nesselkapsel (1982)
    Springer
    Helgoland marine research 35 (1982), S. 97-118 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Migration of cnidoblasts has never been observed in Anthozoa. In contrast to hydrozoans, anthozoans are repeatedly reported to develop nematocysts locally without migration in the entoderm as well as in the ectoderm. The majority of the nematocysts studied in different Octocorallia species (Alcyonaria:Alcyonarium digitatum, Parerythropodium coralloides; Gorgonaria:Pseudopterogorgia aerosa; Pennatularia:Veretillum cynomorium) originate from the ectoderm of the scapus, where, however, no mature nematocysts occur. Cnidoblasts containing immature nematocysts accumulate in the distal scapus, from where they migrate singly like amoebae into the pinnulae of the tentacles. The nematocysts mature during migration, during which the capsular matrix becomes completely electron-translucent. Only in the oral disc, where few nematocysts occur, do they mature locally without migration. In the Octocorallia, nematocyst development and maturation takes places only in the ectoderm. Development of nematocysts has never been observed in the entoderm, nor in the pharynx; this demonstrates its entodermal origin. The entoderm contains only degenerated or phagocytized nematocysts. Contrary to hydrozoans, the mature anthozoan cnidocyte is rounded and has no processes to the mesogloea. Instead of a cnidocil it has a ciliary cone consisting of a normal flagellum, stereocilia and macrovilli. The cnidocyte is characterised by abundant electron-translucent cytoplasm and nematocyst-anchoring structures made up of cross-striated, collagen-like fibrillae and a fibrous basal ring. The position of the cross-striated fibrillae is distally similar to that of the supportive rods in hydrozoan cnidoblasts. The present study clearly demonstrates that structure and, possibly, function of an octocorallian cnidocyte is much simpler than that of a hydrozoan cnidocyte. On the other hand, cnidoblast migration, occurring in Hydrozoa as well in Octocorallia, turned out to be a much older phylogenetic character than was formerly believed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02289837
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  • 6
    Electronic Resource
    Electronic Resource
    Eine Röntgenkleinwinkelanalyse von Polyacrylnitril-Fasern (1982)
    Springer
    Colloid & polymer science 260 (1982), S. 205-211 
    Details
    ISSN: 1435-1536
    Keywords: Röntgenkleinwinkel ; Polyacrylnitril ; Fasern ; Hohlraumsystem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Abstract Measurements of the equatorial X-ray small-angle scattering are reported for 9 polyacrylnitrile fibers. They are evaluated according to Porod's theory. Data on void fraction and inner surface are obtained. With several samples, a Gumier-evaluation of the inner portion is possible, agreement is satisfactory. An attempt is made to interpret the results obtained with the help of a cyhndric model.
    Notes: Zusammenfassung Von 9 Polyacrylnitril-Fasern wird die diffuse äquatoriale Röntgenkleinwinkelstreuung gemessen und nach der Porod'schen Theorie ausgewertet, wobei Daten über den Hohlraumteil und die innere Oberfläche erhalten werden. Bei einigen Proben ist auch eine Guinier-Auswertung des Innenteils möglich; die Übereinstimmung ist gut. Es wird versucht, die Meßresultate anhand eines Zylindermodells zu interpretieren.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01465441
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  • 7
    Electronic Resource
    Electronic Resource
    Standardized loading test with protein for the differentiation of phenylketonuria from hyperphenylalaninaemia (1982)
    Springer
    Journal of inherited metabolic disease 5 (1982), S. 29-35 
    Details
    ISSN: 1573-2665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Eighty-nine protein-loading tests were performed in 80 patients with an increased blood phenylalanine concentration. The amount of protein corresponding to 0.18g phenylalanine/kg body weight per day was calculated and given for 3 days, during which time eight phenylalanine and eight tyrosine blood concentrations were determined. Nine numerical evaluations were checked for discrimination between phenylketonuria and hyperphenylalaninaemia. The two most powerful discriminants were the phenylalanine blood concentration after 72 hours (sample taken in the morning of the 4th day after the beginning of the load) with a limit value of 15 mg/dl (0.91 mmol/l), and the mean value of the 5th to 8th phenylalanine values, also with a limit value of 15 mg/dl. In only eight of the 80 patients would the final diagnosis not have been established by the loading test.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01799751
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  • 8
    Electronic Resource
    Electronic Resource
    Untersuchungen über die eiablagetiefe der Dörrobstmotte Plodia interpunctella Hbn. in Roggen und Mais (1982)
    Springer
    Journal of pest science 55 (1982), S. 1-4 
    Details
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Zusammenfassung Bei geschüttetem Roggen gelangen die Eier von Dörrobstmotten (Plodia interpunctella Hbn.) bis in eine Tiefe von 4,5 cm bis 5 cm unter die Oberfläche, bei Mais bis in eine Tiefe von 8 cm. Bei Roggen befinden sich die meisten Eier in der obersten Getreideschicht bis zu 2 cm, bei Mais in einer Schicht bis zu 3 cm. Auf Mais konnte sich eine größere Anzahl Mottenlarven entwickeln als auf Roggen.
    Notes: Abstract The maximum depth of egg deposition was 4.5–5 cm in bulked rye and 8 cm bulked maize. The majority of eggs were deposited 0–2 cm beneath the surface in rye and 0–3 cm beneath the surface in maize. Significantly more larvae developed in maize than in rye.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01904126
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  • 9
    Electronic Resource
    Electronic Resource
    Properties and diversity of C18 bonded phases (1982)
    Springer
    Chromatographia 16 (1982), S. 11-17 
    Details
    ISSN: 1612-1112
    Keywords: Octadecyl bonded phase ; Silica properties and selectivity ; Comparison of selectivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The effect of the properties of the silica gel matrix, and of the octadecylsilane used, on the chromatographic selectivity of C18 bonded phases is described. Preparation of bonded phases with monochlorodimethyloctadecylsilane is easier because absolute water exclusion is not required in this case. The surface coverage (μmol/m2) is smaller than with dichloromethyl- or trichlorooctadecylsilanes, but in these cases a secondary silanization with HMDS is essential to remove newly formed silanol groups. Bonded phases on Si 60 give the largest amount of hydrocarbon per unit column volume, large k′ values and good selectivity, however, surface coverage and efficiency of these packed columns is less than with Si 100 silica. The chemical properties of the silica surface also influence bonded phase selectivity. Bonded phases should not be compared with only a single eluent, because properties of bonded phases differ with test solutes and test conditions, i.e. eluent composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02258862
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  • 10
    Electronic Resource
    Electronic Resource
    Stabile Isotope in Biochemie und angewandten biologischen Wissenschaften (1982)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 311 (1982), S. 335-335 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00481697
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