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  • 1
    Call number: PIK N 076-04-0304
    Type of Medium: Monograph available for loan
    Pages: p. cm
    ISBN: 0851998356
    Note: Aerts, J. (Jeroen)
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 1366-1375 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 24 (1991), S. 709-711 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Aramid fibres show elongated microvoids parallel to the direction of the fibre axis, resulting in an equatorial streak in the small-angle X-ray scattering (SAXS) pattern. The scattered intensity in the equatorial direction has been measured for three samples of the same fibre: an untreated yarn specimen, yarn in which Ag2S was precipitated and a single filament of the latter. In the case of the untreated yarn, the interpretation of the SAXS pattern is hindered by the presence of residual water in the voids, resulting in a three-phase system. The SAXS pattern of the yarn with precipitated Ag2S follows the theoretical pattern (adapted for the two-dimensional case) for a system with random pores, but the interface between aramid and Ag2S shows fractal properties. The single filament with Ag2S shows a SAXS pattern analogous to that of the fibre with Ag2S, indicating that multiple scattering and interfilament scattering is negligible. It was also found that the Ag2S precipitates in the fibre with preferred orientation.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 36 (1996), S. 645-652 
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A method is presented for the fast prediction of polymer crystal structures. From a stable helical conformation of the polymer chain well packed three dimensional periodic starting structures are generated using an adapted version of M. Blanco's Molecular Silverware algorithm. These structures are then energy-minimised using classical molecular mechanics methods. The method only requires a rough estimate of the crystalline density. No information about crystal class, space group or cell parameters is necessary. Using this method, possible crystal structures of poly(ethylene ketone), Nylon-6,6 and poly(ethylene terephthalate) are calculated. Both the α- and β-structures of poly(ethylene ketone) are correctly predicted. For Nylon-6,6 the lowest-energy structure obtained corresponds to the experimental α-structure. For poly(ethylene terephthalate) a large number of structures are generated using the algorithm. Besides the experimental structure four structures are found with a lower energy than the experimental structure.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Thin Solid Films 46 (1977), S. 223-228 
    ISSN: 0040-6090
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Antonie van Leeuwenhoek 51 (1985), S. 155-165 
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The lipid content and fatty acid composition of a strain ofBacillus caldolyticus and of two facultative thermophiles (B. flavothermus and strain NZ-2) were analysed after growth at different temperatures. In all three strains the amount of membrane, as a fraction of total cellular dry mass, was found to increase with temperature, however, in varying degrees. Changes of lipid content and protein/lipid ratio inB. caldolyticus between 60°C and 100°C and in strain NZ-2 between 45°C and 70°C were minor; inB. f avothermus the alterations in the 50°C–70°C range were more pronounced. The same was found for changes observed in the phospholipid/total lipid and phospholipid/membrane ratios, and also in the amounts of individual phospholipids. The alterations of the fatty acid composition were most significant inB. caldolyticus, especially between 80°C and 95°C. In contrast, the main changes inB. flavothermus and NZ-2 were found to occur between 30°C and 50°C, and between 45°C and 60°C, respectively. Based on these data, strain NZ-2 could be characterized as the least andB. flavothermus as the most versatile of the three organisms.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    European journal of plant pathology 80 (1974), S. 215-227 
    ISSN: 1573-8469
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Samenvatting Het aantal virussen waarvan bekend is dat zij bij aardbeien kunnen voorkomen is vrij groot. Daar de beschrijving van de specifieke aardbeivirussen uitsluitend gebeurt op basis van de zgn. biologische eigenschappen is de identificatie en de vergelijking van deze virussen vaak een probleem. Een samenvattend overzicht van de verschillende virussen, die bij aardbeien tot nu toe gevonden werden, alsook van hun synoniemen en verwantschappen, bleek gewenst. Van een stijgend aantal ziekten, waarvan men tot voor kort meende dat zij door virussen werden veroorzaakt, wordt thans aangenomen dat zij het gevolg zijn van mycoplasma's. Daar mycoplasma's zich epidemiologisch ook als virussen gedragen werden zij in dit overzicht eveneens opgenomen. Teneinde tot een zo betrouwbaar mogelijke internationale inventarisatie te komen werd het manuscript van deze publikatie aan verschillende buitenlandse onderzoekers, die op het gebied van de aardbeivirussen werkzaam zijn, gezonden. Van hun opmerkingen en suggesties werd dankbaar gebruik gemaakt bij de samenstelling van dit overzicht. Het overzicht werd in tabelvorm opgesteld en omvat de volgende rubrieken: (1) virussen van het ‘geelrand-krinkel’ complex, (2) andere aardbeivirussen, (3) virussen met een brede waardplantenreeks (waaronder aardbeien), (4) virussen van andere waardplanten geïsoleerd uit aardbeien (vermoedelijk toevallige infecties), (5) virussen van andere waardplanten welke kunstmatig op aardbeien konden overgebracht worden, en (6) ziekten die vroeger toegeschreven werden aan virussen, doch die vermoedelijk veroorzaakt worden door mycoplasma's. In totaal worden in de tabellen 54 verschillende virussen vermeld, terwijl 8 ziekten worden opgenomen waarvan bewezen is of waarvan verondersteld wordt dat zij mycoplasma's als oorzaak hebben.
    Notes: Abstract The present survey based on the literature lists the viruses and mycoplasmas infecting strawberries and endeavours to sort out their relationships and synonyms. Remarks and suggestions of several specialists from various countries were taken into consideration. The data have been assembled in tables. In total, 54 different viruses have been reported to infect strawberry and eight diseases have been attributed to mycoplasmas.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Окисление о-ксилола на ванадиевом катализаторе представляет собой реакционную систему с основными реакциями, протекающими как последовательно, так и параллельно: Энергии активации и предэкспоненциальные множители были определены экспериментально в интегральном реакторе. Предлагается одноразмерная гетерогенная модель с внешней диффузией. Были определены температурная зависимость выхода и селективности к продуктам окисления.
    Notes: Abstract The oxidation of o-xylene over a vanadium oxide catalyst is a consecutive-competitive reaction system. The activation energies and pre-exponential factors have been determined in an integral reactor. A one-dimensional heterogeneous model with external diffusion has been considered. The temperature dependence of the yield and selectivity of oxidation has been determined.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 1319-1330 
    ISSN: 0887-6266
    Keywords: alternating ethylene carbon monoxide copolymer crystal structure melting ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The perfectly alternating ethylene carbon monoxide copolymer (polyketone; POK) has been studied by means of 1H nuclear magnetic resonance and thermal analysis, and the crystal structure, determined by wide angle x-ray scattering methods, is presented. The crystal structure of this polymer in well-oriented fibers (POK-α) is as follows: Space group Pbnm, α = 6.91 (2) Aå, b = 5.12 (2) Aå, c = 7.60 (3) Aå (fiber axis), pc = 1383 kg/m3. This differs from the structure reported earlier by Chatani et al. (POK-β). The very dense packing in the POK-α structure is a result of the arrangement of the dipoles in the crystal lattice, giving rise to strong lateral forces between the polymer chains. Owing to the all-trans conformation of the polymer chain in the crystal lattice, high moduli can be achieved for well-oriented fibers. A first approximation results in a value of 360 GPa for the theoretical modulus. From the melting data for a series of low molecular weight polyketone homologs, a first, estimate is derived for the crystalline heat of fusion (215-330 J/g) for infinite chain length. As a result of the strong lateral forces, this polymer shows a (very) high crystalline heat of fusion, whereas creep and compressive strength of oriented fibers are expected to be superior to those of high-modulus polyethylene fibers. © 1993 John Wiley & Sons, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 315-326 
    ISSN: 0887-6266
    Keywords: alternating ethylene-carbon monoxide copolymer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Differential scanning calorimetry and high temperature x-ray diffraction were used to study the perfectly alternating copolymer of ethene and carbon monoxide (polyketone; POKC2). It was found that oriented POK-C2 fibers show a crystalline phase transition at a temperature between 110-125°C with a 10% change in crystalline density. At this temperature, the crystal structure reported recently (POK-α) is transformed to a crystal structure that was reported in the past for room temperature imperfectly alternating polyketone. The latter structure will be designated as POK-β. The influence of chain defects on the crystal structure was studied by synthesizing terpolymers (POK-C2/C3), in which small amounts of propylene-CO units are incorporated into the polymer backbone. The resulting terpolymers differ from the copolymer by the presence of methyl groups randomly distributed along the polyketone backbone chain. Evidence is presented that indicates that the methyl groups are built into the crystal lattice as defects. With more than 5 mole-% propene the terpolymer fibers crystallize exclusively in the β-modification. Below this level the α/β ratio (at room temperature) increases with decreasing amounts of propene. Both as-synthesized and as-spun POK-C2 were found to consist of both POK-α and POK-β; the α/β ratio depends on the method of preparation. Because the drawn POK-C2 fibers studied here consist exclusively of POK-α, the process of spinning and drawing leads to the transformation of unoriented β-rich material into oriented POK-α. © 1995 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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