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
  • new species  (10)
  • Chemistry  (3)
  • 2-methyl ketones
Collection
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Untersuchung der teilschritte der ethylen-hochdruck-polymerisation, 1. Druckabhängigkeit der einzelnen geschwindigkeitskonstanten (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 207-216 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In order to calculate the average molecular weight, the molecular weight distribution or the branching of low density polyethylene, the individual values of the rate constants of the different reactions involved in the free radical polymerization are required. The method of rotating sector was applied to determine the rate constants of chain propagation and chain termination in a wide range of temperatures and pressures. This first part of the work reports the influence of the pressure. It was found that the rate constant kp of the chain propagation increases with rising pressure whereas the rate constant kt of chain termination decreases. The effect of the pressure on kp can be explained in terms of the activation volume. The decrease of kt with pressure is caused by a diffusion controlled termination reaction.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840120
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Untersuchung der teilschritte der ethylen-hochdruckpolymerisation, 2Teil 1: cf.1.. Druck- und temperaturabhängigkeit der einzelnen geschwindigkeitskonstanten (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 849-859 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In the first part of this series the individual rate constants of the radical polymerization of ethylene are reported in dependency of pressure at 405 K. By further measurements under 500 - 1750 bar and 400 - 470 K, using again the method of the rotating sector, the dependency of the rate constants on both pressure and temperature was determined. With increasing temperature the rate constant of chain growth kp as well as that of chain termination kt increases. With increasing pressure, kp increases, whereas kt decreases because of the diffusion controlled termination reaction. For the chain growth an activation energy of Ep = 37 kJ/mol and an activiation volume of Δvp≠ = -25,5 ml/mol was found. The activiation parameters of the chain termination are Et = 9,9 kJ/mol and Δvt≠ = 7 ml/mol. Based on these results and literature data the rate constants of different chain transfer reactions involved in the high pressure polymerization of ethylene and their dependency on temperature and pressure were evaluated.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840419
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Regiospecific Synthesis of 3,4-Disubstituted Furans and ThiophenesDedicated to Professor Xi-Kui Jiang, Shanghai Institute of Organic Chemistry, on the occasion of his 70th birthday. (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 459-466 
    Details
    ISSN: 0947-3440
    Keywords: Furans ; Thiophens ; Palladium catalysis ; Coupling reactions ; Heterocycles ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The regiospecific synthesis of 3,4-disubstituted furans and thiophenes is reviewed. Our initial approach used 3,4-bis(tri-n-butylstannyl)furan as a building block, which led to many structurally diverse 3,4-disubstituted furans. Another avenue was explored by using 3,4-bis(trimethylsilyl)furan and 3,4-bis(trimethylsilyl)thiophene as precursors. A variety of unsymmetrically 3,4-disubstituted furans and thiophenes were prepared in this way. The advantages of our strategy lie in its stepwise manner as well as its prospect of yielding 3,4-disubstituted furans and thiophenes with rather different substitution pattern.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199719970304
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Identification of chemicals attractive to the olive bark beetle, Phloeotribus scarabaeoides, in laboratory bioassays (1998)
    Springer
    BioControl 43 (1998), S. 345-355 
    Details
    ISSN: 1573-8248
    Keywords: 2-methyl ketones ; aldehydes ; analysis ; attractants ; Coleoptera ; monoterpenes ; Scolytidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The semiochemical system of the olive bark beetle Phloeotribus scarabaeoides was investigated. During the course of their life-cycle, whole insects, excised hindguts, frass, wood and leaves were collected, from both the field and from a laboratory rearing system. Samples were analysed by capillary GC/MS, after solvent extraction, collection of air volatiles on a sorbent or solid sample injection. Olfactometer bioassays were used to test the different samples and individual compounds for attraction to both sexes. Decanal, undecanal, 2-decanone, 2-nonanone and 2-undecanone, as well as α- and β-pinene, were identified as attractive compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009931601673
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    facet.materialart.
    Unknown
    First records of water mites from La R\xc3\xa9union Island with the description of one new species (Acari, Hydrachnidia) (2023)
    Les Amis d\'Acarologia
    In:  Acarologia vol. 63 no. 4, pp. 1102-1108
    Details
    Publication Date: 2024-02-01
    Description: New records of water mites (Acari: Hydrachnidia) from La R\xc3\xa9union Island are presented. \nOne species new to science, i.e. Diplodontus insulanus Pe\xc5\xa1i\xc4\x87 & Smit sp. nov. (Hydryphantidae) is described\xcd\xbe a second species, Neumania nodosa (Daday, 1898) (Unionicolidae) is \nreported for the first time from La R\xc3\xa9union.
    Keywords: water mites ; new species ; taxonomy ; DNA-barcoding ; running waters
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 6
    facet.materialart.
    Unknown
    Species of Schizotricha Allman, 1883 (Cnidaria, Hydrozoa) from recent antarctic expeditions with R.V. \'Polarstern\', with the description of a new species (1996)
    In:  Zoologische Mededelingen vol. 70 no. 28, pp. 411-435
    Details
    Publication Date: 2024-01-12
    Description: Five species of the genus Schizotricha Allman, 1883, one of which is new to science, have been studied.\nThe material originates from the Weddell Sea region and from off Elephant Island and it was collected during several antarctic expeditions with the R.V. Tolarstern\'. Each species is described and figured and its systematic position among allied species discussed. The type material of Schizotricha glacialis (Hickson & Gravely, 1907) and S. turqueti Billard, 1906 has been re-examined and is also described and figured.
    Keywords: Cnidaria ; Hydrozoa ; hydroids ; Schizotricha ; Antarctic ; re-description of species ; new records ; new species
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 7
    facet.materialart.
    Unknown
    On two Antarctic species of Oswaldella Stechow, 1919: O. shetlandica Stepan\'yants, 1979 and O. elongata spec. nov. (Cnidaria Hydrozoa) (Notes on Antarctic hydroids, II) (1995)
    In:  Zoologische Mededelingen vol. 69 no. 26, pp. 341-351
    Details
    Publication Date: 2024-01-12
    Description: Two species of the antarctic hydroid genus Oswaldella Stechow, 1919, are considered. The first, described by Stepan\'yants (1979) as a subspecies, O. billardi shetlandica, has been raised to specific level and will henceforth be indicated as Oswaldella shetlandica Stepan\'yants, 1979. A second species is described as Oswaldella elongata spec. nov. Both species are differentiated against the remaining known species of Oswaldella; new records are added and the geographical distribution is discussed.\nResumen: Se considera la posici\xc3\xb3n sistem\xc3\xa1tica de dos especies del g\xc3\xa9nero Oswaldella Stechow, 1919.\nUna de ellas, descrita por Stepan\'yants (1979) como una subespecie de Oswaldella billardi Briggs, 1938, es elevada al nivel espec\xc3\xadfico y pasa a denominarse Oswaldella shetlandica Stepan\'yants, 1979. La segunda especie se describe como Oswaldella elongata spec. nov. Se remarcan las diferencias de estas dos especies con las restantes especies del g\xc3\xa9nero y se presentan los datos existentes sobre la autoecolog\xc3\xada de ambas especies.
    Keywords: Cnidaria; Hydrozoa; hydroids; Antarctic; new records ; new species
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 8
    facet.materialart.
    Unknown
    On Clathrozoellidae (Cnidaria, Hydrozoa, Anthoathecatae), a new family of rare deep-water leptolids, with the description of three new species (2003)
    In:  Zoologische Verhandelingen vol. 345, pp. 281-296
    Details
    Publication Date: 2024-01-12
    Description: Three new species of Anthoathecatae (Cnidaria, Hydrozoa) of the rare genus Clathrozoella Stechow, 1921, Clathrozoella abyssalis spec. nov., C. bathyalis spec. nov. and C. medeae spec. nov., are described from New Zealand and Antarctic waters. Along with the previously known C. drygalskii (Vanh\xc3\xb6ffen, 1910) the genus Clathrozoella now numbers four species. Details of the skeleton, hydranths, nematocysts and gonophores are described and discussed, as is also the position of the newly established family Clathrozoellidae.
    Keywords: Hydrozoa ; Anthoathecatae ; Clathrozoellidae ; Clathrozoella ; Antarctic ; benthos ; new species
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 9
    facet.materialart.
    Unknown
    Redescription of Schizotricha anderssoni Jaderholm, 1904 (Cnidaria: Hydrozoa) with the description of a new species. Notes on antarctic hydroids, 4 (1996)
    In:  Zoologische Mededelingen vol. 70 no. 14, pp. 217-226
    Details
    Publication Date: 2024-01-12
    Description: The type series of Schizotricha anderssoni J\xc3\xa4derhoim, 1904, collected by the Swedish Antarctic Expedition 1901-1903 and deposited in the collections of the Swedisch National Museum, Stockholm, is redescribed. The type series is composed of two species, the species figured by J\xc3\xa4derhoim (1905) is designated the lectotype of Schizotricha anderssoni. The second species, differing from the other species of the genus, is described as Schizotricha jaederholmi spec. nov.
    Keywords: Cnidaria ; Hydrozoa ; hydroids ; Schizotricha ; new species ; Antarctic
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 10
    facet.materialart.
    Unknown
    The benthic hydroid fauna of the Chafarinas Islands (Albor\xc3\xa1n Sea, western Mediterranean) (2002)
    In:  Zoologische Verhandelingen vol. 337, pp. 1-180
    Details
    Publication Date: 2024-01-12
    Description: The benthic hydroid fauna of the Chafarinas Islands (Western Mediterranean), collected during a survey in the summer of 1991, has been studied. A total of 86 species, 20 athecate hydroids and 66 thecate hydroids, has been recorded. For every species, the synonymy, a survey of the material studied and data concerning ecology and distribution are included. The majority of the species has been figured and the most important have been (re)described.
    Keywords: Hydrozoa ; hydroids ; benthos ; biodiversity ; ecology ; biogeography ; new species
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...