ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (14)
  • Springer  (14)
  • American Institute of Physics (AIP)
  • 1975-1979  (14)
  • Chemistry and Pharmacology  (11)
  • Process Engineering, Biotechnology, Nutrition Technology  (2)
  • Computer Science  (1)
Collection
  • Articles  (14)
Source
Keywords
Publisher
Years
Year
Journal
Topic
  • 1
    Electronic Resource
    Electronic Resource
    A numerical taxonomy of Merovingian coins (1978)
    Springer
    Computers and the humanities 12 (1978), S. 201-214 
    Details
    ISSN: 1572-8412
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Media Resources and Communication Sciences, Journalism
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02392933
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Inconsistency in the species concept for yeasts due to mutations during vegetative growth (1979)
    Springer
    Applied microbiology and biotechnology 8 (1979), S. 271-278 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The generic classification of yeasts is based mainly on morphological characteristics whereas the definition of a species depends predominantly on physiological properties such as the utilization of carbon and nitrogen sources. Classification procedures are routinely done on agar slants, and in negative tests single colonies are often noticed. These colonies are spontaneous mutations and can be idetified as such after transfer onto adequate media and appropriate genetic tests. It is sometimes possible after selection steps to obtain a completely different ‘species’. This means that in many cases the classification depends only on single gene differences, where the differences in DNA base homology is almost certainly less than 1%. Since it is rather difficult to justify a new species on the basis of a single biochemical gene mutation, it is necessary in practice to perform at regular intervals an extended series of physiological tests in order to avoid confusion in nomenclature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00508791
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    SN-Reaktionen in Schichtsilicaten (1979)
    Springer
    Naturwissenschaften 66 (1979), S. 110-111 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00373505
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Katalytische Dehydrierung im Mikrogrammbereich (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 257-264 
    Details
    ISSN: 1618-2650
    Keywords: Katalytische Dehydrierung ; Ultramikrobereich, Apparatur, TAS-Verfahren ; Thermofraktographie/TAS-Verfahren/Chromatographie, Dünnschicht ; Dehydrierung, Ultramikrobereich ; Analyse von Sesquiterpenderivaten, Terpenoiden, Steroiden ; Chromatographie, Dünnschicht ; katalyt ; Dehydrierung, TAS-Verfahren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die direkte Kopplung einer katalytischen Dehydrierung mit der Dünnschicht-Chromatographie wird beschrieben. Die Reaktion erfolgt nach dem Prinzip der Gasphasendehydrierung durch schubweises Einspritzen der Lösung der zu dehydrierenden Verbindung in die z. B. mit Palladium-Bariumsulfat-Katalysator versehene TAS-Patrone. Die Einwaagen liegen im Bereich von 20–100 μg und die Reaktionstemperaturen je nach Verbindung zwischen 200 und 400°C. Die Reaktionsprodukte werden durch die Lösungsmitteldämpfe zur Schicht transferiert. Anschließend wird chromatographiert und die Reaktionsprodukte identifiziert. Als Anwendungsbeispiele werden Sesquiterpenkohlenwasserstoffe und -alkohole, Sesquiterpenoide des Eudesmantyps, Abietinsäure und Steroide dehydriert.
    Notes: Abstract Direct coupling of a catalytic dehydrogenation to TLC is described. The reaction takes place according to the principle of gas phase dehydrogenation by injecting the solution of the compound to be dehydrogenized in batches into the TAS-cartridge, loaded with e.g. palladium-barium sulphate catalyst. Sample size are in the range of 20–100 μg and the reaction temperatures, depending on the compound, is between 200 and 400°C. The reaction products are carried by the solvent vapours to the thin-layer and subsequently chromatographed and identified. In given examples the dehydrogenation is applied to sesquiterpene hydrocarbons and alcohols, sesquiterpenoids of the eudesman type, abietic acid and steroids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424245
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Thermofraktographie zur Schnellanalyse von Kunststoffen. 3. Mitteilung (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 187-191 
    Details
    ISSN: 1618-2650
    Keywords: Identifizierung von Vinylpolymeren, Kunststoffen ; Thermofraktographie/Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Erhitzt man Vinylpolymere im Temperaturgradient von 50–450° C, so fragmentieren diese in bestimmten Temperaturbereichen zu definierten Produkten. Diese werden fraktioniert auf der DC-Schicht aufgefangen und anschließend chromatographiert. Aus den so erhaltenen Thermofraktogrammen ist die Identifizierung des Ausgangsmaterials möglich. Man erhält z. B. aus den Polyvinylestern die entsprechende Säure bzw. aus Copolymeren die verschiedenen Säuren. Die Thermolyse des Polyvinylcarbazols liefert Vinylcarbazol und aus Polyvinylpyrrolidon erhält man auf der DC-Schicht Vinylpyrrolidon und Pyrrolidon. Das Polymethacrylat fragmentiert zu dem entsprechenden Methacrylat, und aus Polyacrylat erhält man das Acrylat. Die Auswertung der Thermofraktogramme führt z.T. zu neuen Vorstellungen über die Zusammensetzung und den Spaltungsmechanismus derartiger Polymere.
    Notes: Abstract When heating vinyl polymers within the temperature gradient of 50–450° C, they are fragmented in certain temperature ranges to defined products. These products are fractionated on the TLC-layer and subsequently chromatographed. Based on the thermofractograms obtained identification of the starting material can be made. From polyvinyl esters, e.g., the corresponding acid is obtained and copolymers yield the different acids. Thermolysis of polyvinyl carbazole yields vinyl carbazole and vinyl pyrrolidone and pyrrolidone are obtained from polyvinyl pyrrolidone. Polymethacrylate is fragmented to the corresponding methacrylate, and acrylate if obtained from polyacrylate. Evaluation of the thermofractograms leads in part to new conceptions about structures and cleavage mechanisms of such polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00488063
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Liquid-Chromatographie von Alkoholen auf mikrokristalliner Cellulose (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 257-260 
    Details
    ISSN: 1618-2650
    Keywords: Trenn. von Glycerin, Äthylenglykol, Propandiolen und Butandiolen bzw. von Methanol, Äthanol, Isopropanol, n-Propanol, Butanolen und Pentanolen ; Chromatographie, Säulen ; mikrokristalline Cellulose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Wasserbeladene mikrokristalline Cellulose als stationäre Phase in der ‚'Liquid-Chromatography“ (LC) eignet sich bei Verwendung eines mit ca. 15% Wasser gesättigten Gemisches aus Essigsäureäthylester und n-Propanol zur Trennung von mehrwertigen Alkoholen wie z. B. Glycerin, Äthylenglykol, Propandiol, Butandiol. Mit Benzol als Fließmittel lassen sich auf der gleichen Säule auch die einwertigen C1-C5-Alkohole trennen. Zum Nachweis sind Differentialrefraktometer und Mikroadsorptionsdetektoren geeignet.
    Notes: Abstract In “liquid chromatography” (LC), a stationary phase of microcrystalline cellulose is suitable for the separation of polyhydric alcohols such as glycerine, ethylene glycol, propane diol and butane diol when using a solvent mixture of ethyl acetate and n-propanol, saturated with approx. 15% of water. When using benzene as solvent, the monohydric alcohols C1-C5 can also be separated on the same column. Differential refractometers and micro adsorption detectors are suitable for detection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429369
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Transportmechanismen und Ausbeuten beim TAS — Verfahren (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 277 (1975), S. 97-104 
    Details
    ISSN: 1618-2650
    Keywords: TAS-Verfahren ; Transportvorgänge, quantitative Auswertung. Chromatographie, Dünnschicht ; Trägergasdestillation, -sublimation, Wasserdampfdestillation, Thermoextraktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Der Transport der aus einer Probe aufgrund einer thermischen Dampfdruckerhöhung abtrennbaren Substanzen zur DC-Schicht kann beim TAS-Verfahren verschiedenartig und mit unterschiedlicher Effektivität erfolgen. Die geringsten Ausbeuten ergibt die „erzwungene Konvektion“; wesentlich bessere Resultate erhält man bei der sog. Treibmittelextraktion, und die besten Ausbeuten ergibt eine Trägergasextraktion im Heliumstrom. Als Modellsubstanzen dienten Nipagin®, Sudanrot, Dimethylgelb, Menadion® und Diphenyl. Eine annähernd quantitative Thermoextraktion aus Proben gelingt nur mit Mengen unter 20 μg. Die Auswertung erfolgte nach Ausschaben und Elution auf photometrischem Weg.
    Notes: Abstract In the TAS procedure, substances which can be separated from a sample by thermal increase of the vapour pressure can be transported to the TLC layer in different ways and with varying effectiveness. “Forced Convection” gives the lowest yields, results improve considerably with the so-called carrier gas extraction, and a carrier gas extraction in a stream of helium results in optimal yields. Nipagin®, Sudan red, Dimethyl yellow, Menadione® and Diphenyl were used as model substances. An almost quantitative thermoextraction from samples can only be achieved with amounts of less than 20 μg. Following scraping off and elution of the corresponding TLC-zones a photometric assay is carried out for quantitative determination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00602076
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    facet.materialart.
    Unknown
    Extraction with supercritical gases in coupling with thin-layer chromatography (1976)
    Springer
    Details
    Publication Date: 1976-04-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 9
    facet.materialart.
    Unknown
    Katalytische Dehydrierung im Mikrogrammbereich (1975)
    Springer
    Details
    Publication Date: 1975-01-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 10
    facet.materialart.
    Unknown
    Inconsistency in the species concept for yeasts due to mutations during vegetative growth (1979)
    Springer
    Details
    Publication Date: 1979-01-01
    Print ISSN: 0171-1741
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...