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11 results on '"E. Talman"'

1. Sex Pheromones of the American Cockroach,Periplaneta americana

Author

P. E. J. Verwiel, F. J. Ritter, E. Talman, and C. J. Persoons

Subjects
chemistry.chemical_compound, biology, Stereochemistry, Chemistry, Sex pheromone, Reaction scheme, Periplanone B, Spectral analysis, General Chemistry, American cockroach, biology.organism_classification, Alimentary tracts, Periplaneta
Abstract

Two sex pheromones, periplanone A and periplanone B were isolated from the American cockroach Periplaneta americana. The technique is described for collecting periplanone B from the alimentary tracts of virgin females. Periplanone A was extracted from the excreta of the insects. Mass spectral analysis of the pheromones and related compounds were performed and the results are reported here. Evidence is presented suggesting that periplanone A is in fact a degradation product of periplanone B. A reaction scheme is considered for the pathway: periplanone B periplanone A (stable, but inactive) PA 22–VII.

Published
1978
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2. Sex pheromone of the american cockroach,Periplaneta americana

Author

C. J. Persoons, F. J. Ritter, P. E. J. Verwiel, and E. Talman

Subjects
Cockroach, medicine.medical_specialty, biology, Periplanone B, General Medicine, biology.organism_classification, Biochemistry, Alimentary tracts, chemistry.chemical_compound, Endocrinology, chemistry, biology.animal, Internal medicine, Sex pheromone, medicine, Epimer, American cockroach, Ecology, Evolution, Behavior and Systematics, Periplaneta
Abstract

The sex pheromone of the American cockroach,Periplaneta americana, consists of two compounds, which we have named periplanone-A and periplanone-B. The two compounds can be isolated from fecal material in a ratio of 1∶10, and periplanone-B can also be isolated from intestinal tracts. A total amount of 200 μg of periplanone-B has been isolated from both fecal material and alimentary tracts. By means of gas chromatography-mass spectrometry, hydrogenation, infrared analysis, and NMR analysis, we were able to identify periplanone-B as (1Z,5E)-1,10(14)-diepoxy-4(15),5-germacradien-9-one. The overall structure was confirmed by comparison with a synthetic, biologically active epimer of periplanone-B.

Published
1979
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4. ChemInform Abstract: SEX PHEROMONES OF THE AMERICAN COCKROACH, PERIPLANETA AMERICANA

Author

F. J. Ritter, C. J. Persoons, E. Talman, and P. E. J. Verwiel

Subjects
chemistry.chemical_compound, biology, Stereochemistry, Chemistry, Sex pheromone, Reaction scheme, Periplanone B, Spectral analysis, General Medicine, American cockroach, biology.organism_classification, Periplaneta, Alimentary tracts
Abstract

Two sex pheromones, periplanone A and periplanone B were isolated from the American cockroach Periplaneta americana. The technique is described for collecting periplanone B from the alimentary tracts of virgin females. Periplanone A was extracted from the excreta of the insects. Mass spectral analysis of the pheromones and related compounds were performed and the results are reported here. Evidence is presented suggesting that periplanone A is in fact a degradation product of periplanone B. A reaction scheme is considered for the pathway: periplanone B periplanone A (stable, but inactive) PA 22–VII.

Published
1979
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8. 5-methyl-3-butyl-octahydroindolizine, a novel type of pheromone attractive to Pharaoh's ants (Monomorium pharaonis (L.)

Author

P. E. J. Verwiel, I. E. M. Rotgans, F. Stein, F. J. Ritter, and E. Talman

Subjects
Pharmacology, Cellular and Molecular Neuroscience, chemistry.chemical_compound, chemistry, biology, Stereochemistry, Molecular Medicine, Pheromone, Cell Biology, Monomorium, biology.organism_classification, Molecular Biology, Monomorine I
Abstract

Aus Arbeiterinnen der AmeiseMonomorium pharaonis (L.) wurde 5-Methyl-3-butyl-octahydroindolizin isoliert. Dieses Pheromon ubt eine starke Lockstoffwirkung auf die Arbeiterinnen dieser Ameisenart aus. Die Struktur wurde durch Spektral-analyse und Synthese aufgeklart. Unseres Wissens ist dies das erste Pheromon aus Insekten mit dem Indolizingerust.

Published
1973
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9. Is zero-pressure fixation of bioprosthetic valves truly stress free?

Author

Vesely I, Lozon A, and Talman E

Subjects
Animals, Biomechanical Phenomena, In Vitro Techniques, Pressure, Stress, Mechanical, Swine, Tensile Strength, Aortic Valve physiology, Bioprosthesis, Heart Valve Prosthesis, Tissue Fixation methods
Abstract

Zero-pressure fixation has often been referred to as stress-free fixation, which implies that no leaflet stresses exist during the fixation process. The two aortic valve cusp layers, the fibrosa and the ventricularis, however, are believed to produce mutually opposing forces within the valve cusps. Residual stresses may therefore exist even during zero-pressure fixation. We first verified the presence of such internal stresses by separating the layers of pig aortic valve leaflets and measuring dimensional changes. In the 11 specimens examined, the fibrosa expanded radially by 30% +/- 13% (mean +/- standard deviation), whereas the ventricularis contracted by 12% +/- 4%. The ventricularis also contracted circumferentially by 13% +/- 3%. We measured the extensibility of 120 fresh and glutaraldehyde-fixed fibrosa and ventricularis components to investigate the mechanical effects of glutaraldehyde fixation under such internal stresses. We also tested the layers from leaflets that were fixed whole. We compared the extensibility of the fibrosa and the ventricularis, each fixed in the presence and absence of residual stresses, and found that, in the radial directions, the ventricularis from valve cusps that were fixed whole was less extensible than fresh ventricularis (35.4% versus 63.7% strain to high-modulus phase, p < 0.00001). The fibrosa from cusps that were fixed whole, however, was more extensible than fresh fibrosa (39.2% versus 29.5% strain, p < 0.0122 radially; 12.8% versus 8.2% strain, p < 0.0001 circumferentially). The ventricularis became less extensible because it was fixed under tension, and the fibrosa became more extensible because it was fixed under compression. This study therefore demonstrates the presence of residual tensile and compressive stresses in the ventricularis and fibrosa, even when the leaflets are relaxed. Zero-pressure fixation cannot therefore be considered truly stress free, in the engineering sense, because residual internal stresses affect collagen fiber crimp and change the extensibility of the fibrosa and the ventricularis.

Published
1993

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