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  • Digitale Medien  (74)
  • Chemistry  (43)
  • Cell & Developmental Biology  (26)
  • frontalin  (5)
  • 1
    Digitale Medien
    Digitale Medien
    Field responses of the western pine beetle1 and one of its predators to host- and beetle-produced compounds (1980)
    Springer
    Journal of chemical ecology 6 (1980), S. 625-641 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Pinus ponderosa ; Dendroctonus brevicomis ; Temnochila chlorodia ; pheromone ; kairomone ; exo-bievicomm ; frontalin ; trans-ver-benol ; verbenone ; terpenes ; Coleoptera ; Scolytidae ; Trogositidae
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The responses of the western pine beetle (Dendroctonus brev-icomis LeConte) andTemnochila chlorodia (Mannerheim) to candidate attractants—exo- andendo-brevicomm, frontalin,trans-verbenol, ver-benone, and ponderosa pine turpentine and its major monoterpene components—were quantified by counts of beetles on traps baited with the various attractants, singly and in combinations released simultaneously. Combinations ofexo-brevicomin and frontalin plus a monoterpene or turpentine were the most attractive toD. brevicomis. The responses to these attractant combinations were reduced when verbenone plustrans-verbenol were present. All single compounds and binary mixtures, exceptexo-brevicomin plus frontalin, were much less attractive.exo-Brevicomin was most attractive toT. chlorodia, and this response appeared to decrease when verbenone plustrans-verbenol were present.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00987674
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  • 2
    Digitale Medien
    Digitale Medien
    Interruption of response ofDendroctonus brevicomis to its attractive pheromone by components of the pheromone (1981)
    Springer
    Journal of chemical ecology 7 (1981), S. 183-196 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Pinus ponderosa ; Dendroctonus brevicomis ; western pine beetle ; attractant ; interruption ; behavior ; pheromone ; Coleoptera ; Scolytidae ; exo-brevicomin ; frontalin ; myrcene ; verbenone
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The catch of the western pine beetle,Dendroctonus brevicomis, at an attractive source of racemicexo-brevicomin, racemic frontalin, and myrcene was reduced by surrounding the source with a grid of 48 stations releasing all three compounds together, orexo-brevicomin alone or myrcene alone. Each compound was released at the rate of 2 mg/24 hr/station. The catch at an attractive bolt cut from a tree being colonized byD. brevicomis was not reduced byexo-brevicomin, but was reduced by the combination ofexo-brevicomin, frontalin, and myrcene in one of two tests. When a transect of traps was placed across a 0.81-hectare plot at six of the 48 stations releasing all three compounds, more beetles were caught at outer than at inner traps. More beetles were caught at unbaited traps on trees in a plot when the three compounds were released than when onlyexo-brevicomin or no compounds were released. A few trees were attacked byD. brevicomis in some of the plots. The antiattractant verbenone released from 48 stations at the rate of 4 mg/24 hr/station did not reduce the catch at an attractive tree bolt.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00988646
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  • 3
    Digitale Medien
    Digitale Medien
    Behavior of the western pine beetle during host colonization (1985)
    Springer
    Journal of chemical ecology 11 (1985), S. 1249-1261 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Pinus ponderosa ; Dendroctonus brevicomis ; pheromone ; attractant ; interruptant ; exo-brevicomin ; frontalin ; Coleoptera ; Scolytidae
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract After living ponderosa pines were baited with either female-infested bolts or synthetic pheromones,Dendroctonus brevicomis were caught on sticky screens throughout trapping periods of 15–46 days; however, large numbers of beetles were trapped during only a small portion (5–10 days) of these trapping periods. The most attractive portions of trees attacked contained 3–6 beetles dm2, in galleries ca. 2 cm long. Catch increased following addition of males to female-infested bolts, supporting the hypothesis that male-produced frontalin is an attractive pheromone of the western pine beetle. Catch at bolts removed from trees under attack was strongly dependent upon levels of boring activity. We found no evidence of interruption of the response to attractants during host colonization.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01024113
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  • 4
    Digitale Medien
    Digitale Medien
    Field response ofDendroctonus brevicomis toexo-brevicomin, frontalin, and myrcene released at two proportions and three levels (1985)
    Springer
    Journal of chemical ecology 11 (1985), S. 757-766 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Dendroctonus brevicomis ; Coleptera ; Scolytidae ; bark beetle ; western pine beetle ; attractant rate ; pheromone ; exo-brevicomin ; frontalin ; myrcene
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Racemicezo-brevicomin, racemic frontalin, and myrcene were released at two proportions (5∶1∶400 and 1∶1∶1), each at three levels (1 ×, 10 ×, and 100 ×) in a ponderosa pine forest in central California. The 5∶1∶400 mix was based on an estimate of the relative amounts released from a ponderosa pine under attack by the western pine beetle,Dendroctonus brevicomis. MoreD. brevicomis were trapped at a source of the three compounds released at 5∶1∶400 than were trapped at a source released at 1∶1∶1, at all three levels, but this difference was statistically significant only at the 1 × and 10 × levels. Sex ratio of trapped beetles and distribution of catch at the source of attractant and 5 m away apparently did not differ between relative release rates.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00988303
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  • 5
    Digitale Medien
    Digitale Medien
    Effect of verbenone on response ofDendroctonus brevicomis toexo-Brevicomin, frontalin, and myrcene (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 113-122 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Dendroctonus brevicomis ; Coleoptera ; Scolytidae ; bark beetle ; western pine beetle ; pheromone ; attractant ; inhibitor ; exo-brevicomin ; frontalin ; myrcene ; verbenone
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract exo-Brevicomin (E), frontalin (F), and myrcene (M) were released at two rates 10-fold apart with verbenone at four rates 10-fold apart, and without verbenone in plots with one trap on a vertical cylinder at the pheromone source and one trap on each of four cylinders 5 m away. Catch of the western pine beetleDendroctonus brevicomis decreased with increasing levels of verbenone at both release rates of EFM, but not all differences in catch were statistically significant. Significantly more beetles were caught at the high rate of EFM than at the low rate, combining all rates of verbenone. The percent of total beetles caught at the center trap tended to decrease with increasing rates of verbenone, but the only statistically significant differences were at the low rate of EFM.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01022535
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  • 6
    Digitale Medien
    Digitale Medien
    The building of protein structures form α-carbon coordinates (1990)
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 7 (1990), S. 366-377 
    Details
    ISSN: 0887-3585
    Schlagwort(e): computer modeling ; protein ; structure ; α-carbons ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A procedure for the construction of complete protein structures from only αcarbon coordinates is described. This involves building the backbone by sequential addition of Pro, Gly, or Ala residues. This main chain structure is then refined using molecular dynamics. Side chains are constructed by sequential addition of atoms with intermediate molecular dynamics refinement. For α lytic protease (a structure that is mostly β sheet) a backbone root mean square deviation (RMSD) of 0.19 Å and an overall RMSD of 1.24 Å from the crystallographic coordinates are attained. For troponin C (67% β-helix), where the coordinates are available only for the α-carbons, a backbone RMSD of 0.41 Å and an overall RMSD of 1.68 Å are attained (fits kindly provided by Dr. Michael James and Natalie Strynadka). For flavodoxin a backbone RMSD of 0.49 Å and an overall RMSD of 1.64 Å were attained.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prot.340070408
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  • 7
    Digitale Medien
    Digitale Medien
    A simple two-dimensional representation for the common secondary structural elements of polypeptides and proteins (1997)
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 27 (1997), S. 227-233 
    Details
    ISSN: 0887-3585
    Schlagwort(e): peptide conformation ; ramachandran plot ; PDB search ; peptide dynamics ; BPTI ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A simple method is presented for projecting the conformation of extended secondary structure elements of peptides and proteins that extend over four Cαatoms onto a simple two-dimensional surface. A new set of two degrees of freedom is defined, a pseudo-dihedral involving four sequential Cαatoms, as well as the triple scalar product for the vectors describing the orientation of the three intervening peptide groups. The method provides a reduction in dimensionality, from the usual combination of multiple φ,ψ pairs to a single pair, yielding valuable information concerning the structure and dynamics of these important elements. The new two-dimensional surface is explored by reference to 63 selected protein crystal structures together with a comparison of model built peptides representing the common secondary structural elements. Dynamical aspects on this new surface are examined using a molecular dynamics trajectory of Basic Pancreatic Trypsin Inhibitor. © 1997 Wiley-Liss, Inc.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    Spatial patterns of gene expression in preimplantation mouse embryos (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 1 (1989), S. 254-263 
    Details
    ISSN: 1040-452X
    Schlagwort(e): mRNA localization ; In situ hybridization ; Blastocysts ; Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: The distribution of total polyadenylated RNA and mRNAs from the β-actin, fibronectin, and cytokeratin Endo A genes was examined in preimplantation mouse embryos using in situ hybridization of riboprobes to RNA in sections of embryos. Polyadenylated RNA was found in the cytoplasm of all cells of blastocyst-stage embryos, whereas the specific mRNAs displayed three distinct patterns of expression: uniform throughout the embryo (β-actin), enriched in the inner cell mass (fibronectin), and enriched in the trophectoderm (Endo A). In eight-cell embryos, the polyadenylated RNA was more concentrated in nuclei than in the cytoplasm (as noted previously), although this was not the case in blastocysts, nor was it true for the specific mRNAs that were examined. These experiments demonstrate that there is localized gene expression in the early mouse embryo, which correlates with the formation of the trophectoderm and the inner cell mass.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrd.1080010406
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  • 9
    Digitale Medien
    Digitale Medien
    Polymerization of methacryloyl chloride in selected solvents (1963)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 3 (1963), S. 67-70 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Methacryloyl chloride was polymerized in a number of solvents, and the polyacid chloride was converted into the methyl ester. The yield and viscometric molecular weight are given for each sample, whereas the osmometric molecular weight is given for selected samples. The choice of solvent controls the degree of polymerization between the limits of 500 and 8,800. Polymer yields were about 20% and the degree of polymerization was 1500 when dioxane was used as a solvent, whereas the yield increased to 45% and the DP was very high when such solvents as cyclohexane and n-hexane were used. Polymerization in solvent mixtures gave intermediate molecular weight values. Infrared analysis showed the presence of anhydride.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760030114
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  • 10
    Digitale Medien
    Digitale Medien
    Prediction of diallyl phthalate molding performance from laboratory tests II. Comparison of mechanical spectrometer and brabender torque rheometer (1974)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 14 (1974), S. 273-275 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Two series of glass-reinforced diallyl phthalate molding compounds from two different manufacturers were evaluated using a Rheometrics, Inc. Mechanical Spectrometer and a Brabender Torque Rheometer. Comparison of reactivity and minimum viscosity as measured by these two instruments is presented. The Mechanical Spectrometer appears capable of differentiating smaller changes in melt viscosity than does the Brabender Torque Rheometer.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760140405
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