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  • Springer  (70)
  • Institute of Physics  (13)
  • American Chemical Society (ACS)
  • 1995-1999  (71)
  • 1970-1974  (12)
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Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Misinterpretation yields supervelocities during transmission of wave packets through a barrier (1999)
    Springer
    The European physical journal 12 (1999), S. 135-146 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 73.40.Gk Tunneling - 03.65.Bz Foundations, theory of measurement, miscellaneous theories (including Aharonov Bohm effect, Bell inequalities, Berry's phase) - 05.60.Gg Quantum transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: This paper is concerned with the transmission time of an incident Gaussian wave packet through a symmetric rectangular barrier. Following Hartman (J. Appl. Phys. 33, 3427 (1962)), the transmission time is usually taken as the difference between the time at which the peak of the transmitted packet leaves the barrier of thickness and the time at which the peak of the incident Gaussian wave packet arrives at the barrier. This yields a corresponding transmission velocity which appears under certain conditions as a supervelocity, i.e. becomes larger than the corresponding propagation velocity in free space which is the group velocity for electrons or the velocity of light for photons, respectively. By analysing the propagation of a broadband wave packet (which leads in free space to an extremely concentrated wave packet at a certain time) we obtain the pulse response function of the barrier and show that the insertion of the barrier is physically unable to produce a supervelocity. Therefore, the peak of an incident Gaussian wave packet and the peak of the transmitted wave packet are in no causal relationship. The shape of the transmitted wave packet is produced from the incident wave by convolution with the pulse response of the barrier. This yields a distortion of the shape of the wave packet which includes also the observed negative time shift of the peak. We demonstrate further that the phenomenon of Hartman's supervelocities is not restricted to barriers with their exponentially decaying fields but occurs for instance also in transmission lines with an inserted LCR circuit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050988
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  • 2
    Electronic Resource
    Electronic Resource
    The Extent of Benthic Impacts of CCA-Treated Wood Structures in Atlantic Coast Estuaries (1998)
    Springer
    Archives of environmental contamination and toxicology 34 (1998), S. 313-322 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract. To ascertain the extent of impacts from CCA-treated wood bulkheads, we sampled sediments along 10-m transects from these bulkheads and from reference sites (either bulkheads made of other materials or unbulkheaded areas nearby) and analyzed the fine fraction for metals. We ascertained metal content in resident biota, and analyzed species richness, Shannon-Wiener diversity index, and biomass of the benthic community. We found accumulation of metals in the fine-grained portion of nearby sediments and reduction in the biotic community nearby (generally at 0 and 1 m); such gradients were generally not seen in reference transects. At two of the sites there was evidence for secondary reduction of the community out further to 3 or 10 m, where the metals in the fines were lower but the percent fines was greatly increased. At all the other sites, impacts were generally limited to 0 and 1 m. The lack of reduction at further distances at the other sites is attributed to factors such as the age of the bulkheads, high energy of the environment, or nature of the sediments at those sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002449900324
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  • 3
    Electronic Resource
    Electronic Resource
    Schooling behavior of Menidia medidia in the presence of the insecticide Sevin (Carbaryl) (1974)
    Springer
    Marine biology 28 (1974), S. 261-263 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A single application of 100 parts per billion Sevin in seawater caused disruption of schooling behavior of Menidia menidia in an artificial setting. Although the change, primarily a spreading out of the school over a larger area, was observed after 24 h exposure, placing the fish in clean water did not bring about a return of normal schooling patterns until 72 h. This is attributed to the accumulation of 1-naphthol, a toxic product of hydrolysis of Sevin. The adaptive significance of changes in schooling behavior is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388493
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  • 4
    Electronic Resource
    Electronic Resource
    Genomic organization, chromosomal localization, and transcriptional variants of the murine pactolus gene (1999)
    Springer
    Mammalian genome 10 (1999), S. 1075-1081 
    Details
    ISSN: 1432-1777
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The Pactolus gene encodes a cell surface protein similar to that of the β integrin subunit family. The murine Pactolus gene is comprised of 16 exons that encompass 24 kb of the genome. The genomic organization of the Pactolus gene is very similar to that described for the human β2 integrin gene (and deduced for murine β2 integrin), including a separate exon containing only 5′ untranslated sequences. The Pactolus gene was mapped to a terminal region of murine Chromosome (Chr) 16, distinct from the previously mapped site of the β2 integrin gene on murine Chr 10. The Pactolus gene encodes three distinct transcripts via alternative splicing. The Pactolus A transcript encodes the full-length protein including transmembrane and cytoplasmic domains, while the Pactolus B transcript truncates translation before reaching these membrane-anchoring sequences. A newly discovered form, Pactolus C, is found in neonatal samples (along with Pactolus A) and would also encode a prematurely terminated protein. This form is derived from an alternative splicing event that skips part of exon 11, deletes exon 12, and uses an alternative acceptor site upstream of exon 13. The formation of the Pactolus B and C forms is thus governed by a complex alternative splicing mechanism that is affected by the developmental status of the animal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003359901164
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  • 5
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    The Extent of Benthic Impacts of CCA-Treated Wood Structures in Atlantic Coast Estuaries (1998)
    Springer
    Details
    Publication Date: 1998-05-01
    Print ISSN: 0090-4341
    Electronic ISSN: 1432-0703
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Published by Springer
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  • 6
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    Misinterpretation yields supervelocities during transmission of wave packets through a barrier (1999)
    Springer
    Details
    Publication Date: 1999-10-01
    Print ISSN: 1434-6028
    Electronic ISSN: 1434-6036
    Topics: Physics
    Published by Springer
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  • 7
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    Schooling behavior of Menidia medidia in the presence of the insecticide Sevin (Carbaryl) (1974)
    Springer
    Details
    Publication Date: 1974-01-01
    Print ISSN: 0025-3162
    Electronic ISSN: 1432-1793
    Topics: Biology
    Published by Springer
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  • 8
    Electronic Resource
    Electronic Resource
    The crystal structure of 2-amino-5,5′-bis(β-cyanoethyl)-1,2-pyrrolenineN-oxide monohydrate (1995)
    Springer
    Journal of chemical crystallography 25 (1995), S. 569-571 
    Details
    ISSN: 1572-8854
    Keywords: PyrrolenineN-oxide ; hydrogen bonding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract 2-Amino-5,5′-di(β-cyanoethyl)-1,2-pyrrolenineN-oxide monohydrate, C10H14N4O·H2O, crystallizes from MeCN in space group P212121 witha=7.0007(5),b=8.2998(6),c=20.8418(13) Å,V=1211.0(2) Å3,Z=4. The structure was refined toR=0.034 andR w=0.044 for 2325 observed reflections. The pyrrolenine ring adopts a nearly planar conformation, with maximum deviation from planarity 0.089(2) Å. The N−O distance is 1.345(2) Å. The water molecule bridges two pyrrolenine molecules via hydrogen bonds to theirN-oxide oxygen atoms, and also accepts a hydrogen bond from the NH2 group of another pyrrolenine molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01667025
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of Isomeric Isoxazolopyridinones (1998)
    Springer
    Monatshefte für Chemie 129 (1998), S. 1285-1292 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. 3-Acetyl-4-methylaminopyridin-2-one; Hydrogen bridge bond; 4-Hydroximinopyridin-2-one; 3-(1-Hydroxyethyliden)-piperidin-2 ; 4-dione; Isoxazolo[4 ; 3-c]pyridinone; Isoxazolo[4 ; 5-c]pyridinone..
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Bei der Umsetzung von 4-Methylamino-5,6-dihydropyridinon mit Acetylchlorid entstand ausschließlich das 3-Acetylderivat. Bei der alkalischen Hydrolyse der Methylaminogruppe entstand ein Gemisch zweier Hydroxyderivate. Diese reagieren mit Hydroxylamin zum Isoxazolo[4,5-c]pyridinon, während das 4-Methylaminoanaloge in Abhängigkeit vom pH-Wert zum Isoxazolo[4,3-c]pyridinon oder zum Isoxazolo[4,5-c]pyridinon cyclisiert. Die Konfiguration der letzteren Verbindungen wurde durch NMR-Messungen gesichert..
    Notes: Summary.  Reaction of 4-methylamino-5,6-dihydropyridinone with acetyl chloride yielded exclusively the 3-acetyl derivative. When the methylamino group of the latter was removed by alkaline hydrolysis, a mixture of two hydroxy derivatives was formed. Those cyclized upon treatment with hydroxylamine exclusively to the isoxazolo[4,5-c]pyridinone, whereas the 4-methylamino analogue yielded, depending on pH, mainly the isoxazolo[4,3-c]pyridinone or the isoxazolo[4,5-c]pyridinone. The configurations of the latter compounds were established by NMR experiments..
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010140
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and Haemolytic Activity of Randianin Isomers (1999)
    Springer
    Monatshefte für Chemie 130 (1999), S. 887-897 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Glycosidation; Glycosides; Terpenes.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Randianin, ein hämolytisches Saponin aus Randia dumetorum, sowie einige dazu isomere Glycoside wurden ausgehend von Oleanolsäure synthetisiert. Der Einfluß der Verknüpfung in der Dissaccharidseitenkette auf die hämolytische Wirkung dieser Glycoside wurde untersucht.
    Notes: Summary.  Randianin, a haemolytic active saponin from Randia dumetorum, and some of its isomers with different carbohydrate side chains have been synthesized from oleanolic acid. The influence of the linkage within the disaccharide residue on the haemolytic activity of these glycosides has been investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010270
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