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  • 1
    Electronic Resource
    Electronic Resource
    Photodissociation of Kr+n clusters (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 3215-3223 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photodissociation of Kr+n (3≤n≤11) cluster ions is observed for the first time in the 565 to 630 nm wavelength range. Kr+3 has a photodissociation cross section of (8.1±0.8)×10−17 cm2 at 612 nm, while Kr+4 and Kr+5 are found to have larger photodissociation cross sections than Kr+3 with a slightly red-shifted spectrum. Only Kr+ is detected as a photofragment of Kr+3, while in the Kr+n (4≤n≤7) experiments, both Kr+2 and Kr+ photofragments are seen. As size n increases from 7 to 11, Kr+ disappears and Kr+3 appears. Laser power studies show that all are single photon photodissociation processes. For higher order Kr+n clusters (4≤n≤7) the intensity ratio between the two photodissociation products Kr+2 and Kr+ is dependent on the wavelength of the laser light used in the photodissociation, but independent of the polarization direction of the laser. Translational energy analysis of the photofragments is used to investigate the photodissociation mechanisms. In contrast to the photodissociation of Kr+3, where two types of Kr+ photofragments with different values of translational energy release are observed, only one type of Kr+2 photofragment, with zero kinetic energy release is found in the Kr+4 photodissociation. These findings are discussed in terms of the dynamics of photodissociation and possible structures of these cluster ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458854
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  • 2
    Electronic Resource
    Electronic Resource
    DERMATITIS HERPETIFORMIS OCCURRING IN MONOZYGOUS TWINS JANET MARKS, STANTON (1971)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 84 (1971), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1971.tb02525.x
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  • 3
    Electronic Resource
    Electronic Resource
    Improved N-Ethylcarbazole Determination of Carbohydrates with Emphasis on Sea Water Samples (1958)
    s.l. : American Chemical Society
    Analytical chemistry 30 (1958), S. 1935-1941 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60144a016
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  • 4
    Electronic Resource
    Electronic Resource
    The delayed ionization and atomic ion emission of binary metal metallocarbohedrenes TixMyC12 (M=Zr, Nb; 0≤y≤4; x+y=8) (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 3423-3432 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Investigations of the photophysical character of binary metal containing metallocarbohedrene clusters (Met-Cars), reveal the phenomena of delayed ionization. Additionally, the onset of a channel corresponding to delayed atomic ion emission is observed at high laser fluence, becoming progressively more significant as the fluence is raised. The fluence dependence of both the delayed electron and delayed atomic ion emission channels at 355 and 532 nm are reported, and the Met-Car delayed ion yield estimated. At moderate fluences, the yield of the delayed electron emission channel leading to the Met-Car ion is found to be on the order of 70% of the total Met-Car signal. All of the experimental findings point to thermionic emission being the operative mechanism for the delayed ionization, while the delayed atomic ion emission is evidently a new mechanism [B. D. May, S. F. Cartier, and A. W. Castleman, Jr., Chem. Phys. Lett. 242, 265 (1995)] which may be due to the collective electronic excitation of these cluster materials. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471535
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  • 5
    Electronic Resource
    Electronic Resource
    TixZryC12 and TixHfyC12 (x+y=8): Binary metal metallocarbohedrenes (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 5384-5386 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the production of binary metal metallocarbohedrenes. Direct laser vaporization of mixtures of zirconium or hafnium powders with titanium carbide yield the species TixZryC12 and TixHfyC12 (x+y=8). These results are discussed in the context of recent theoretical models addressing the stabilities and structures of the metallocarbohedrenes, their formation mechanism and possible implications for the synthesis of "doped'' metallocarbohedrenes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467154
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  • 6
    Electronic Resource
    Electronic Resource
    Photodissociation of binary metal metallocarbohedrenes (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 2231-2238 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The 532 nm photodissociation of the three singly substituted, binary metal containing Metallocarbohedrenes, Ti7MC12+ (M=Y, Zr, or Nb), is investigated. The photofragments are identified through energy analysis of the fragment ions in a reflectron time-of-flight mass spectrometer, a new technique in photodissociation studies that results in a more accurate identification of the photofragment mass than what would normally be achievable through mass analysis using time-of-flight determinations. The findings reveal that the dominant mechanism proceeds through the loss of neutral Ti atoms for all clusters studied. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474118
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  • 7
    Electronic Resource
    Electronic Resource
    Binary Metal Metallocarbohedrenes of Titanium and Group IIIA, VA, and VIA Metals (1994)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 116 (1994), S. 5295-5297 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00091a038
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  • 8
    Electronic Resource
    Electronic Resource
    Pheromone-induced production of antimicrobial peptides in Lactobacillus (1997)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 26 (1997), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Production of the bacteriocin sakacin P by Lactobacillus sake LTH673 is dependent on a secreted 19-residue peptide pheromone (IP-673). The gene encoding IP-673 (sppIP) was identified and sequenced. SppIP was shown to be co-transcribed with genes encoding a histidine kinase (sppK ) and a response regulator (sppR) typical for signal transduction in bacteria. Further sequencing and transcription studies have shown that IP-673 induces transcription of its own gene and of what are often considered to be all genes necessary for bacteriocin production and immunity. Studies with a reporter gene showed that the promoter in front of the sakacin P structural gene (sppA) is strictly regulated. The promoter in front of sppIP turned out to be less strictly regulated, and low basal promoter activity could be detected in uninduced cells. Bacteriocin production in Bac− isolates of L. plantarum C11 could be induced by the non-cognate IP-673 only after the introduction of sppK, indicating that sppK encodes the pheromone receptor. These results show that bacteriocin production in lactobacilli is regulated using a short, strain-specific peptide pheromone. Growth conditions were shown to have considerable effects on the functionality of this regulatory mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.1997.5821951.x
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  • 9
    Electronic Resource
    Electronic Resource
    Genetic analysis of fish genomes and populations: allozyme variation within and among Atlantic salmon from Downeast rivers of Maine (2005)
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 67 (2005), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Analysis of genetic variation within and among samples of naturally produced Atlantic salmon (n = 372) from 7 Maine (U.S.A.) and one Canadian river were conducted based on 54 allozyme loci. Eight of the 54 loci proved polymorphic, and estimated heterozygosities (HS) based on all loci ranged from 0·012 to 0·026 (mean = 0·021, s.e. = 0·002). Only one of 56 tests revealed genotypic proportions that deviated significantly from Hardy–Weinberg expectations. Genetic distances (D) between samples ranged from 0·002 to 0·022. No obvious association existed between genetic and geographic distances. Cluster analysis of genetic distances revealed the Dennys River sample as the most differentiated when all samples were included in the analysis, though bootstrap support of the cluster analysis was generally weak. G-tests revealed significant differences in allele frequencies among samples at five of the polymorphic loci, and the G-value summed over all loci also indicated significant differences among samples. FST values indicated that 3·4% of the total genetic diversity was due to variability among samples, while 96·6% was due to variability within samples. These results indicate that the Atlantic salmon analyzed in this study had levels of genetic variability and differentiation among samples comparable to native populations from other areas collected across a similar geographic range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-1112.2005.00842.x
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  • 10
    Electronic Resource
    Electronic Resource
    Population genetic analysis of white sturgeon (Acipenser transmontanus) in the Fraser River (2002)
    Oxford, UK : Blackwell Science Ltd
    Journal of applied ichthyology 18 (2002), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0426.2002.00418.x
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