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  • Chemistry  (150)
  • Nederland  (2)
  • Gas chromatography
  • Magnetism
  • 2005-2009  (2)
  • 1965-1969  (150)
  • 1
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    Het is druk aan de top (2008)
    EIS-Nederland, Leiden
    Details
    Publication Date: 2024-01-12
    Keywords: Oestridae ; faunistiek ; Nederland ; Horzels
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/bookPart
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  • 2
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    Overzicht van het zweefvliegengenus Psilota in Nederland (Diptera: Syrphidae) (2005)
    In:  Nederlandse Faunistische Mededelingen vol. 22, pp. 113-120
    Details
    Publication Date: 2024-01-12
    Description: Review of the genus Psilota in the Netherlands (Diptera: Syrphidae)\nA review of the genus Psilota in the Netherlands is presented. It is demonstrated that the genus\nis represented by a complex of two species, Psilota anthracina Meigen, 1822 and P. atra (Fall\xc3\xa9n,\n1817), as already indicated by Kassebeer. Both species can be separated using the key provided\nbelow. The interpretation of the species is exactly opposite to that in recent literature.\nUnfortunately, the holotype of P. atra Fall\xc3\xa9n was lost during transport. Therefore, we designate\na neotype, again a male from Sweden (fig. 6). Our interpretation of the species is based on this\nneotype and the description and pictures of P. anthracina by Meigen.\nThe habitats of both species in the Netherlands differ. Psilota atra is found near pine forest\nwhereas P. anthracina is found near deciduous forest. This seems to agree with the situation in\nthe surrounding countries, as far as we could establish. A key to both species is provided and the\nmale genitalia are illustrated.\nKey to the Dutch species\n1 Hind femur strongly thickened, about twice as broad as the mid femur. Female: posterior\n(convex) part of mesanepisternite with white hairs, abdomen predominantly lighthaired,\nthe 2nd tergite with conspicuous long white hairs in the frontal corners, 3rd tergite\npredominantly\nlight-haired; 3rd antennal segment about 2 times longer than high.\nMale: genitalia: epandrium distinctly elongated (fig. 4). . . . . . . . . . . . . Psilota atra\n- Hind femur only slightly thickened, at most 1.5 times as broad as the mid femur. Female:\nposterior (convex) part of mesanepisternite black-haired, abdomen more black haired,\nthe 2nd tergite without conspicuous long white hairs in the frontal corners, 3rd tergite\npredominantly\nblack-haired; 3rd antennal segment about 1.5 times longer than high.\nMale: genitalia: epandrium not elongated (fig. 5). . . . . . . . . . . . Psilota anthracina
    Keywords: Verspreiding ; Nederland ; Herkenning ; Determinatiesleutel ; Taxonomie ; Biotopen
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 3
    Electronic Resource
    Electronic Resource
    Calorimetric investigation of the influence of polymer concentration on the transition enthalpy in the helix-coil transition of the double-stranded helical complex poly(A + U) (1969)
    New York : Wiley-Blackwell
    Biopolymers 7 (1969), S. 611-613 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1969.360070416
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental thermodynamics of the helix-random coil transition. II. Calorimetric measurement of transition enthalpies of poly A in acid aqueous solution (1969)
    New York : Wiley-Blackwell
    Biopolymers 7 (1969), S. 423-431 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The enthalpy change accompanying the double helix-coil transition of polyriboadenylic acid (poly A) in aqueous solution has been measured optically and calorimetrically in the pH range 5.7-4.5. The course of this cooperative transition was followed optically by measuring changes in ultraviolet absorption as a function of temperature at different pH values, and calorimetrically by determining the heat capacity of the solution through the transition region. From the latter measurements, the enthalpy of transition was calculated. It is shown, that ΔH is dependent on pH as it is expected from the influence of protonation of the double helix of poly A.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1969.360070313
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  • 5
    Electronic Resource
    Electronic Resource
    Notiz über die Bildung von Benzyloxycarbonyl-α-aminoglutarimid aus Benzyloxycarbonyl-L-glutamin (1969)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 2158-2159 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19691020645
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  • 6
    Electronic Resource
    Electronic Resource
    Microbial transformation of hydrocarbons. II. Growth constants and cell composition of microbial cells derived from n-alkanesF. Wagner, W. Zahn, and U. Bühring, “1-Hexadeceno, an intermediate in the microbial oxidation of n-hexadecane in rivo and in vitro,” Angew. Chem., Intn. Edit., 6, 359(1967). (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 11 (1969), S. 393-408 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Cultivation of Norcardia sp., Mycobacterium phlei, and Candida lipolytica in inorganic salt solution containing n-alkanes C10-C20 as solo carbon and energy source was investigated. Generation times of 0.5-7.0 hr were typical during the exponential growth phase. The final cell concentrations (dry weight) were usually 9-26 g/l with n-alkane mixtures ranging from n-decane through n-eicosane. A linear dependence was found between the production of cell mass and the consumption of n-alkanes. The rest concentration of n-alkanes in the cell mass is in all experiments smaller than 0.5% (w/w). Cell yields were Ysub 60-142% and for Ye 50-97% based on n-alkane utilization. In one case, with the Nocardia NBZ 23, the substrate specifity on hydrocarbons and on a n-alkane mixture C10-C20 was studied. The cell mass recovered from the fermentations contained 47.8-57.7% carbon, 5.6-9.95% nitrogen, 7.2-9.4% hydrogen, 35-62% crude protein, and 6-36% lipid. Cellular protein and lipid synthesized by an organism is influenced by the type of nitrogen source. The amino acid, glucosamine, muramic acid, 2,6-diaminopimelinic acid, and fatty acid distribution in organisms grown on n-alkanes compared with a corresponding fermentation on glucose as sole carbon source were also estimated.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260110311
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  • 7
    Electronic Resource
    Electronic Resource
    Beobachtungen an korrodierten Teilen einer stationären 10-MW-Gasturbine (1965)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 16 (1965), S. 952-958 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Observations on corroded parts of a stationary 10 MW gas turbineThe present contribution to the problem of high-temperature corrosion deals with the observations made on parts of the combustion chamber of a gas turbine driven by heavy oil. The corrosion phenomena encountered are mainly due to the hot combustion gases. Temporarily reducing conditions and the effects of sulphur lead, mainly to a reduction of the Cr content of the base material through the formation of sulphides and carbides and thus to a higher corrosion rate under oxidising condition.By way of experiment, the behaviour of six different heat-resistant materials of high strength at high temperatures was tested under normal working condition. The nickel-based alloy NiCr20Ti was found to show a lower corrosion rate than the materials with fe contents.
    Notes: Der vorliegende Beitrag zum Problem der Hochtemperaturkorrosion beschreibt die an Brennkammerteilen einer mit Schweröl betriebenen Gasturbine gemachten Beobachtungen. Es handelt sich vor wiegend um einen Angriff durch die heißen Brenngase. Zeitweise reduzierende Bedingungen und die Einwirkung von Schwefel führen vor allem zu einer Cr-Verarmung der Grundmasse durch Sulfid- und Carbidbildung und damit zu einem beschleunigten Angriff unter oxydierenden Bedingungen.Versuchsweise wurde das Verhalten von 6 verschiedenen hitzebeständigen und warmfesten Werkstoffen unter Betriebsbedingungen geprüft. Dabei zeigte die Ni-Basis Legierung NiCr20Ti einen schwächeren Angriff als die Fe- haltigen Materialien.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19650161105
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  • 8
    Electronic Resource
    Electronic Resource
    Dichte Calciumfluoridkeramik, ein neues, gegen Flußsäure beständiges, feuerfestes TiegelmaterialVortrag anläßlich der Achema 1964 des “Europäischen Symposium”: “Neue Werkstoffe für extrem hohe Beanspruchung”. (1965)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 16 (1965), S. 357-363 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Dense calcium fluoride ceramics, a new refractory material for crucibles, resistance to hydrofluoric acidProduction, properties and applications of dross-cast calcium fluoride ceramics are described. These have two prominent characteristics: they are one of the rare substances not attacked by molten uranium;they represent the only ceramics material resistant to hydrofluoric acid.Because of this resistance, the material is ideal for crucibles used for the melting of enriched uranium or plutonium. The segregation capacity increases greatly as soon as densely-sintered crucibles are used. These completely non-porous vessels can, in the sizes suitable for industrial application, only be produced by the dross-casting method.Completely dense dross-cast calcium fluoride ceramics are being used where the absence of substances resistant to fluoride, hydrofluoric acid and fluorides at higher temperatures has so far precluded the application of these chemicals. They are already used with great success in fluorine atmosphere and at temperatures of about 1000°C.
    Notes: Herstellung, Eigenschaften und Verwendungsmöglichkeiten schlickergegossener Calciumfluoridkeramik werden beschrieben. Diese besitzt zwei hervorstechende Merkmale:Ihre Widerstandsfähigkeit macht sie zum idealen Gefäßmaterial für das schmelzen von angereichertem Uran und von Plutonium. Das Abscheidevermögen wächst außergewöhnlich stark an, sobald man dichtgesinterte Tiegel verwendet. Diese völlig porenfreien Gefäße können in für die industrielle Verwendung geeigneter Größe nur nach dem Schlickergußverfahren hergestellt werden. 1Sie ist einer der seltenen Stoffe, die nicht von geschmolzenem Uran ange-griffen werden.2Sie ist das einzige gegen Flußsäure beständige keramische MaterialVollständig dichte, schlickergegossene Calciumfluoridkeramik findet dort An-wendungsmöglichkeiten, wo bisher das Fehlen von gegen Fluor, Flußsäure und Fluoride bei höheren Temperaturen beständigen Stoffen die Verwendung dieser Chemikalien ausgeschlossen hat. In Fluoratmosphäre und bei Temperaturen von etwa 1000°C wurde sie bereits mit sehr gutem Erfolg eingesetzt.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19650160502
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  • 9
    Electronic Resource
    Electronic Resource
    Thermogravimetrische Methode zur Untersuchung der Gleichgewichte Festkörper/Gas und Schmelze/Gas in korrosionschemisch wichtigen Sulfatsystemen (1968)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 19 (1968), S. 837-844 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Thermogravimetric method for investigating the solid/gas and melt/gas equilibria in sulphate systems of corrosion-chemical importanceThe authors describe a micro-thermogravimetric method which permits the determination of the phase zones of sulphate systems as a function of temperature and of the SO3-partial pressure. At the Me2SO4—SO3 (Me = Na, K) system, the existence limits of the bi-variant melt and the mono-variant equilibria Me2SO4(solid)-melt and Me2SO4(solid)-Me2S2O7(solid) are determined. Water vapour is dissolved in the melt phases investigated because the existence limits of the latter are modified by the vapour.
    Notes: Es wird eine mikro-thermogravimetrische Methode beschrieben, welche gestattet, die Phasenfelder von Sulfatsystemen als Funktion der Temperatur und des SO3-Partialdrucks zu ermitteln. Am System Me2SO4—SO3 (Me = Na, K) werden die Existenzgrenzen der bivarianten Schmelze und die monovarianten Gleichgewichte Me 2SO4 (fest)-Schmelze und Me2SO4 (fest)-Me2S2O7 (fest) bestimmt. Wasserdampf löst sich in den untersuchten Schmelzphasen, denn ihre Existenzgrenzen werden durch ihn verändert.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19680191002
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  • 10
    Electronic Resource
    Electronic Resource
    Zonenschmelzen. Von H. Schildknecht. Monographie Nr. 75 zu „Angewandte Chemie“ und „Chemie-Ingenieur-Technik“. Verlag Chemie, GmbH., Weinheim/Bergstr. 1964. 1. Aufl., XII, 226 S., 220 Abb., 29 Tab., Gzln. DM 26. - . (1965)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 77 (1965), S. 61-61 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19650770120
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