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  • 2020-2024
  • 1975-1979  (10)
  • 1920-1924  (3)
  • Cell & Developmental Biology  (8)
  • Hybrids, linear combination of ∼  (3)
  • mating stimulant pheromone
Datenquelle
Materialart
Erscheinungszeitraum
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Linear combination of hybrid orbitals: Acyclic alkanes (1977)
    Springer
    Theoretical chemistry accounts 43 (1977), S. 287-297 
    Details
    ISSN: 1432-2234
    Schlagwort(e): Hybrids, linear combination of ∼ ; Saturated organic compounds, MO treatment of ∼ ; Spectra, far ultraviolet
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A LCHO SCF-CI semiempirical scheme is formulated for compounds of carbon and hydrogen, and far-UV transition energies computed for a number of acyclic alkanes. The type of spectral bands (CH → CH*, etc.) and symmetries of subbands are assigned, and their dependence on conformation and branching discussed. It is argued that, for pentanes and higher alkanes, spectral quantities can be estimated from data on the lower alkanes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00548685
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  • 2
    Digitale Medien
    Digitale Medien
    Comments on the electronic properties of cyclopropane, cyclobutane, and cyclohexane (1977)
    Springer
    Theoretical chemistry accounts 45 (1977), S. 45-52 
    Details
    ISSN: 1432-2234
    Schlagwort(e): Hybrids, linear combination of ∼ ; Saturated organic compounds, MO treatment of ∼ ; Spectra, far ultraviolet ∼ ; Cyclobutane, auxochromic effect of ∼
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Spectral quantities of cyclopropane, cyclobutane, cyclohexane, and of several derivatives, have been calculated by a semiempirical all-valence electron SCF-CI MO method. In cyclopropane, HOMO is practically localized in the carbon-frame, and LVMO is purely so. In cyclobutane, these two MO's are based on C-H bonds, while cyclohexane holds an intermediate position. Despite the overall similarity-experimental and computed-of the spectra of these molecules, assignments are non-parallel. Like cyclopropane, cyclobutane can extend conjugation, but to a diminished degree; cyclohexane behaves in this respect like an acyclic alkane. An interpretation of this gradation, in terms of the nature of high-lying MO's, is proposed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00551457
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  • 3
    Digitale Medien
    Digitale Medien
    Molecular-orbital realizations of the bent-bond model: Spiranic derivatives of cyclobutanone (1978)
    Springer
    Theoretical chemistry accounts 47 (1978), S. 27-38 
    Details
    ISSN: 1432-2234
    Schlagwort(e): Hybrids, linear combination of ∼ ; Saturated organic compounds, MO treatment of ∼ ; Small rings ; Carbonyl stretching frequency
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract In the frame of our studies on small-ring compounds, we deal here with structures in which a three-membered ring and a carbonylated four-membered ring are fixed in close proximity. The theoretical approach is through an allvalence electron semiempirical method. The experimental background, based on results of other workers, comprises mainly UV and IR spectral data. The main topics to be discussed are: charge-donation and charge-transfer from the 3-ring, hypsochromic and bathochromic shifts of electronic transitions related to the carbonyl, direct substituent effects on the carbonyl stretching frequency, and the across-ring interaction in cyclobutanone.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00554694
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  • 4
    Digitale Medien
    Digitale Medien
    Mating stimulant pheromone and cuticular lipid constituents ofFannia femoralis (Stein) (Diptera: Muscidae) (1978)
    Springer
    Journal of chemical ecology 4 (1978), S. 83-93 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Fannia femoralis (Stein) ; pheromone ; mating stimulant pheromone ; (Z)-11-hentriacontene ; cuticular lipid ; fly
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The cuticular lipids of male and femaleFannia femoralis were similar for recently emerged insects but soon began to develop chromatographic patterns characteristic of each sex. Mature females contained more C31 and C33 monoolefin in the cuticular lipid than males. Also, the double bonds in the monoolefins of the female lipid were situated predominantly at the eleventh and thirteenth carbons, while most of those from the males were centrally located in the molecule or at the ninth carbon. The female C31 monoolefin stimulated copulation by the males, but more mating activity occurred when the saturated hydrocarbons present in the female cuticular lipids were added. The synthetic monoolefin most active as a mating stimulant pheromone was (Z)-11-hentriacontene, but the addition of female alkanes or of syntheticn-alkanes to (Z)-11-hentriacontene increased the activity of the synthetic pheromone.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00988263
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  • 5
    Digitale Medien
    Digitale Medien
    Mating stimulant pheromone and cuticular lipid constituents ofFannia pusio (Wiedemann) (Diptera: Muscidae) (1978)
    Springer
    Journal of chemical ecology 4 (1978), S. 73-81 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Fannia pusio (Wiedemann) ; pheromone ; mating stimulant pheromone ; (Z)-11-hentriacontene ; cuticular lipid ; fly
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Chromatograms of the cuticular lipids washed from newly emerged male and femaleFannia pusio were nearly identical. By the time the flies were 1 day old, the chromatographic profiles for the sexes were different. Mature females contained more C31- and C33-hydrocarbons than the males. The double bonds of the female monoolefins were mostly at the eleventh and thirteenth carbons, but those of the males were predominantly at the ninth carbon. Most active in stimulating copulation by males were the unbranched monoolefins with 31 and 33 carbons from the females. When they were synthesized and tested, the most active compound was (Z)-11-hentriacontene.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00988262
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  • 6
    Digitale Medien
    Digitale Medien
    Corpus luteum growth and plasma progesterone levels in unilaterally ovariectomized pregnant rats (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 195 (1979), S. 311-316 
    Details
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Unilateral ovariectomy (ULO) was carried out on rats at Day 8 of gestation: term is Day 23. The effect on peripheral plasma progesterone levels at Day 16 and on growth and cellular changes in the remaining corpora lutea (CL) at Day 17 was determined by comparison with results from control and sham-operated rats. ULO increased the volume of remaining CL by 18% at Day 17. At Day 16 this effect was only apparent in rats with three or fewer CL remaining. CL hypertrophy was due to an increase in the volume of individual luteal cells and not to cell hyperplasia. Luteal cell nuclear volume also increased as did the number of endothelial cells per corpus luteum. The proportion of the corpus luteum occupied by vascular space did not alter.ULO had little effect on mean plasma progesterone levels at Day 16 (92 ± 7 ng/mltreated; 86 ± 11 ng/ml controls). In rats with three or fewer CL remaining, however, progeserone levels were low (51 ± 7 ng/ml).It was concluded that ULO can enhance the growth of corpora lutea and perhaps increase their rate of progesterone production.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ar.1091950206
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  • 7
    Digitale Medien
    Digitale Medien
    Cytological events associated with in vitro aged and fertilized rabbit eggs (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 195 (1979), S. 357-374 
    Details
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The morphogenetic events associated with rabbit eggs aged in vitro for 12 to 50 hours prior to mixing with sperm have been examined by light and electron microscopy. After 12 hours in culture, morphological alterations of the meiotic spindle and the cortex of unfertilized eggs were evident. By 24 to 50 hours in culture, unfertilized eggs contained subnuclei, structures which formed when individual and/or groups of meiotic chromosomes dispersed and became invested by a double-laminated structure reminiscent of a nuclear envelope.Although most eggs obtained 11.5 to 12 hours after induced ovulation and in vitro fertilized displayed morphogenetic patterns similar to those described for in vivo fertilized ova, some (10%) contained three pronuclei. Many eggs obtained 13 to 15 hours after induced ovulation and subsequently mixed with sperm in vitro appeared to undergo processes of fertilization typical of in vivo fertilized eggs, however, approximately 30% contained subnuclei in association with the male pronucleus. Few eggs (15%) aged 12 hours prior to in vitro fertilization displayed patterns of pronuclear development and association typical of fertilized unaged ova. Subnuclei developed in many of the fertilized ova. Supernumerary sperm nuclei, which did not develop into male pronuclei, were observed in some zygotes. Cleavage of eggs aged 12 hours prior to fertilization was abnormal or retarded. After 24 hours in culture approximately 16% of the eggs fertilized. Seventy percent of the fertilized eggs failed to Support the development of a male or female pronucleus.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ar.1091950209
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  • 8
    Digitale Medien
    Digitale Medien
    The cellular pattern of corpus luteal growth during pregnancy in the rat (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 193 (1979), S. 823-830 
    Details
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The cellular pattern of corpus luteal (CL) growth was studied in rats at Days 6, 10, 12, 14, 16, 17 and 22 of pregnancy: term is Day 23. Measurements were taken of the percentage of the CL occupied by luteal cells, connective tissue and vascular space, luteal cell and nuclear volumes, and the number of luteal and endothelial cells in each of three CL in both ovaries of five rats at each stage of pregnancy. Total CL volume increased from 1.08-3.23 μl over Days 10-17. This was mainly due to an increase in luteal cell volume from 3.72 pl to 9.30 pl. Neither the number of luteal cells per CL (range 212,000-287,000) nor the percentage of the CL occupied by luteal cells (range 85-90%) had much influence on growth. Nuclear volume increased roughly in proportion to cytoplasmic volume but near term it decreased despite little change in cytoplasmic volume. The number of endothelial cells per CL increased steadily from 398,000 at Day 6 to 1,545,000 at Day 22. There was a strong negative correlation (r = -0.78) between the number of luteal cells per CL and mean luteal cell volume that was evident at all stages of pregnancy. There was a positive, but weaker correlation (r = 0.35) between number of luteal cells and CL volume. Thus, CL volume seems to be partly determined by the number of luteal cells at Day 6 but this effect is moderated by local control of luteal cell volume.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ar.1091930406
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  • 9
    Digitale Medien
    Digitale Medien
    Proceedings of the American association of anatomists fortieth session (1924)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 27 (1924), S. 375-404 
    Details
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ar.1090270516
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  • 10
    Digitale Medien
    Digitale Medien
    The case and problem method in anatomic neurology (1920)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 18 (1920), S. 351-354 
    Details
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ar.1090180404
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