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  • 1
    Electronic Resource
    Electronic Resource
    Red maple (Acer rubrum) inhibits feeding by beaver (Castor canadensis) (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 2021-2034 
    Details
    ISSN: 1573-1561
    Keywords: Acer rubrum ; Adirondacks ; aspen ; beaver ; Castor canadensis ; feeding inhibition ; Populus tremuloides ; red maple
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract At many beaver (Castor canadensis) sites at Allegany State Park in New York State, red maple (Acer rubrum) is the only or one of the few tree species left standing at the ponds' edges. The relative palatability of red maple (RM) was studied in three ways. (1) At seven beaver sites, the available and utilized trees were recorded and an electivity index (E) computed. Of 15 tree species, RM ranked second or fourth lowest. (2) In experiment I, RM, sugar maple (A. saccharum, SM), and quaking aspen (Populus tremuloides) logs were presented cafeteria style at 10 colonies. RM was the least preferred. (3) Bark of RM was extracted with solvents. Aspen logs were painted (experiment II) or soaked (experiment III) with this RM extract and presented to beaver cafeteria-style, along with aspen and RM controls. This treatment rendered aspen logs less palatable, indicating that a chemical factor had been transferred.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02066240
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  • 2
    Electronic Resource
    Electronic Resource
    Olfactory Imprinting in a Precocial Mammal (1971)
    [s.l.] : Nature Publishing Group
    Nature 229 (1971), S. 55-56 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Early olfactory stimulation influences social behaviour in altricial mammals. Marr and Gardner6 sprayed pups of laboratory rats with cologne and found that they later preferred cologne-smelling rats, while pups treated with methyl-salicylate became socially anosmic as adults. Mainardi et al.7 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/229055a0
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  • 3
    Electronic Resource
    Electronic Resource
    Response to a mammalian pheromone and its geometric isomer (1976)
    Springer
    Journal of chemical ecology 2 (1976), S. 389-398 
    Details
    ISSN: 1573-1561
    Keywords: Black-tailed deer ; geometric isomers ; (E) and (Z)-4-hydroxy-6-dodecenoic acid lactone ; mammals ; Odocoileus hemionus columbianus ; olfactory discrimination ; pheromones ; stereoisomers ; tarsal scent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Black-tailed deer (Odocoileus hemionus columbianus) discriminate between the geometric isomers of a lactone used as a pheromone by the species. They react strongly to (Z)-4-hydroxy-6-dodeceonic acid lactone, which occurs in their tarsal scent, but the response to theE isomer did not differ from the response to the solvent. The isomers were applied to one member of a group of freely interacting deer, and the sniffing, licking, and following responses were recorded. The synthesis of the geometric isomers of the lactone is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988284
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  • 4
    Electronic Resource
    Electronic Resource
    The “deer lactone” (1978)
    Springer
    Journal of chemical ecology 4 (1978), S. 247-256 
    Details
    ISSN: 1573-1561
    Keywords: Black-tailed deer ; “deer lactone” ; discrimination ; enantiomers ; (Z)-4-hydroxy-6-dodecenoic acid lactone ; Odocoileus hemionus columbianus ; lactone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Urine of the black-tailed deer is the source of the “deer lactone,” which is deposited on the tarsal gland tufts by “rub-urination.” The enantiomer composition of the lactone from the urine of the female is 89(R)-(−)/11(S)-(+). Responses by deer were strongest toward the synthetic racemic lactone in the social test and toward the natural lactone in the choice test. In both tests, the (−)- lactone released slightly stronger responses than its enantiomer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988059
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  • 5
    Electronic Resource
    Electronic Resource
    Subspecies specificity of response to a mammalian social odor (1975)
    Springer
    Journal of chemical ecology 1 (1975), S. 125-131 
    Details
    ISSN: 1573-1561
    Keywords: deer ; mammals ; odor preference ; odor specificity ; olfactory discrimination ; pheromone ; sexual isolation ; social odor ; tarsal scent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Two subspecies of deer, black-tailed deer (Odocoileus hemionus columbianus) and Rocky Mountain mule deer (O. h. hemionus) were exposed to the tarsal scents of both subspecies in a social setting. The scent was sprayed on one individual in a group. The responses, consisting of sniffing, licking, and following, were stronger to each subspecies' own tarsal scent. This discrimination may be important for sexual isolation in areas where the ranges of the two species overlap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987725
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  • 6
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance field-cycling proton relaxation study of polymer dispersed liquid crystals (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 4823-4832 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The frequency and temperature dependence of the longitudinal proton relaxation time T1 has been studied in liquid crystal droplets embedded in a solid polymer matrix in the nematic and isotropic phase over a broad Larmor frequency range (500 Hz≤νL≤84 MHz) employing the fast-field-cycling technique. The comparison of the droplet data, bulk 5CB data, and the pure polymer data show that T1 is dominated by the cross relaxation at the liquid crystal–polymer interface in the entire frequency range. In the low frequency range (νL≤1 MHz), an additional relaxation process determines T1 in both phases, namely reorientations mediated by translational replacements in the nematic phase and the exchange relaxation in the isotropic phase. The analysis of the cross relaxation rate k reveals that the simplified model of Vilfan is only applicable in the nematic phase and leads to an anchoring time τAS of the molecules at the surface which is ≈1.3×10−4 s. This model, however, cannot be applied in the isotropic phase, but must be extended by the spin diffusion time τP, which in this case determines the cross relaxation rate. The anchoring time τAS, which in the isotropic phase corresponds to the correlation time of the additional process, is much shorter than in the nematic phase, namely τAS≈10−6 s. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472319
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  • 7
    Electronic Resource
    Electronic Resource
    Non-invasive evaluation of inflammation in atopic dermatitis (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the European Academy of Dermatology and Venereology 3 (1994), S. 0 
    Details
    ISSN: 1468-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In atopic dermatitis the inflammatory reaction is quantified either clinically or histologically. While clinical evaluation has the major disadvantage of inter- and intraoperator variance, histological investigation requires invasive procedures. Therefore, standard techniques which provide both an objective and non-invasive form of examination are desirable.We investigated 20 patients with atopic dermatitis by means of high resolution 20-MHz b-*scan ultrasound. Investigations were performed on inflammatory skin lesions at regular intervals using a standardized combination of external treatment with α-methyl-prednisolon-aceponat ointment and UV-A/UV-B phototherapy until the lesions had healed. Skin colour (erythema) was assessed with the Minolta Chromameter CR 200 colorimeter according to the L*a*b* colour system.Sonograms of affected skin show a zone of low echogenicity below the so-called entry-echo. We refer to this as the echolucent area. Healing of a lesion is seen as a decrease in thickness and an increase in density of the skin in the sonographic image; the echolucent area disappears totally when the lesion has clinically healed. In five patients we excised small areas of skin to compare the sonographic and histological pictures of exactly the same site. This showed that the thickness of the subepidermal echolucent area corresponds to the inflammatory reaction representing both edema and cellular infiltration.Comparing the findings in sonography with the change in skin colour measurements we found that the a*-value of the L*a*b* colour system representing redness correlated well with the sonographic density of the echolucent area. In conclusion, 20-MHz-b-scan sonography and colorimetry are suitable methods for non-invasive, objective evaluation of the inflammatory process in atopic dermatitis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-3083.1994.tb00374.x
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  • 8
    Electronic Resource
    Electronic Resource
    Catalytic mechanism of isoleucyl-tRNA synthetase of Escherichia coli K10. Effect of pH and chemical modification (1980)
    s.l. : American Chemical Society
    Biochemistry 19 (1980), S. 5403-5411 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00564a039
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  • 9
    Electronic Resource
    Electronic Resource
    Frequency stabilized distributed feedback laser diode system at 1.323 μm using the modulated Zeeman effect (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 3828-3831 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present the design of a highly stable, compact system that achieves the frequency stabilization of a distributed feedback laser diode to an excited-state argon transition at 1.323 μm. The argon atomic reference is generated in a miniature hollow cathode lamp. A small a/c magnetic field is used to Zeeman split the transition and both right- and left-circularly polarized light are used to generate the error discriminant signal and cancel laser relative intensity noise. The output does not contain any frequency modulated components and has been measured to have long-term frequency stability of better than 8×10−11 (20 kHz) with the Allan Variance technique. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149996
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  • 10
    Electronic Resource
    Electronic Resource
    Gas-chromatographic determination of C1 to C7 monocarboxylic acids and lactic acid by pyrolysis of the tetrabutyl ammonium salts (1969)
    s.l. : American Chemical Society
    Analytical chemistry 41 (1969), S. 1686-1687 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60281a038
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