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  • Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry  (4)
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  • 1
    Digitale Medien
    Digitale Medien
    The oviduct musculature of the cockroach Leucophaea maderae and its response to various neurotransmitters and hormones (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 1 (1983), S. 167-178 
    Details
    ISSN: 0739-4462
    Schlagwort(e): oviduct ; muscle ; neurotransmitters ; hormones ; cockroach ; Leucophaea maderae ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: The musculature of the oviduct consists of an outer, irregular layer of longitudinal muscle and an inner layer of circular muscle. The four basic modes of activity - compression, segmentation, peristalsis, and reverse peristalsis - were evident in the isolated oviduct. These spontaneous events often occurred in an organized sequence. In fact eggs could be transported down the lateral oviducts by this myogenic activity once the sphincter between the common oviduct and vagina was severed. Myographic recordings were made of only the contractions of the longitudinal muscles.L-glutamate caused a distinct phasic contraction at 2.2 × 10-5 M. The response became larger and more complex as the concentration of the amino acid was increased. Acetylcholine (1.6 × 10-5 M) caused either a phasic or tonic response, or a combination thereof. By contrast, 5HT and tyramine simply increased the frequency of small phasic contractions, although in some preparations both monoamines caused an inhibition. The ecdysones, a juvenile hormone analogue (1 × 10-6 M), and prostaglandin E2 had no effect on oviduct activity.Initially high KCI solutions (162 mM) without Ca++ induced a strong contraction but subsequent additions failed to do so. However, when a high KCI solution (158 mM) with 2 mM Ca++ was added to the preparation the response was partially restored. Also the potent calcium antagonist Mn++ (2mM) can suppress spontaneous activity.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/arch.940010207
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Ovarian muscularis of the stable fly Stomoxys calcitrans: Its structural, motile, and pharmacological properties (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 12 (1989), S. 15-30 
    Details
    ISSN: 0739-4462
    Schlagwort(e): ovarian motility ; impedance myographs ; actions of octopamine ; proctolin ; glutamate ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: The muscles of the ovary of the stable fly (Stomoxys calcitrans) appear to consist of two groups: (1) a network of stellate muscle cells that cover the surface of the ovary and (2) fibers that surround the ovarioles. Innervation of the ovaries was largely restricted to the region of the pedicels. The structural arrangements of the ovarian muscles provided the basis for two distinct patterns of movement. The contraction of the sheath that surrounds the ovary produced the appearance of a pulsing sphere, while the activation of muscle fibers that encompass the ovarioles may cause a vertical translation of eggs within the tubes. The various patterns of motility derived from the combined and separate actions of these two groups of muscles are described. Oscillations in the size of the ovary were the most prominent and frequent kind of spontaneous activity observed. A complete cycle of oscillation ranged from 200 ms to 4 s. Day-old stable flies consistently had the highest rate (30%) of ovarian sheath compression of the three age groups examined, while 2-day-old flies had the lowest (less than 10%). Seven-day flies had inconsistent rates that ranged from o to 25%. Two kinds of ovarian compression were recognized on impedance myographs on the basis of small and large amplitudes. Changes in tonus were also detected. Octopamine produced large increases in the amplitude of spherical compressions at 10-7 M. The neuropeptide proctolin (10-9 M) caused changes in both the frequency and amplitude of ovarian contractions. Glutamic acid consistently caused a marked reduction in the amplitude of ovarian compressions.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/arch.940120103
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Action of Taurine, 3-aminopropanesulfonic acid, and GABA on the hindgut and heart of the cockroach, Leucophaea maderae (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 16 (1991), S. 81-93 
    Details
    ISSN: 0739-4462
    Schlagwort(e): insect ; myotropic activity ; cysteine-sulfinic acid ; picrotoxin ; bicuculline ; 3-APS ; arrhythmia ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: Taurine, glycine, glutamate, and γ-aminobutyric acid (GABA) were all present in concentrations of greater than 1% of the total free amino acid content in the brain, thoracic, and abdominal ganglia of Leucophaea maderae. Hemolymph, subesophageal ganglia, and hindgut had substantial amounts of glutamate and glycine, but less than 0.3% taurine or GABA. Taurine, 3-aminopropanesulfonic acid (3-APS), cysteine-sulfinic acid (CSA), and GABA each had myotropic activity on the isolated cockroach hindgut, with 3-APS having the most consistent effect (ED50 = 0.63 mM), while taurine and CSA activities were similar to that of GABA on the hindgut. Both taurine and 3-APS had anti-arrhythmic effects on semi-isolated heart preparations of L. maderae, while GABA was inhibitory and induced arrhythmia. Bicuculline was antagonistic to the effects of GABA, taurine, and 3-APS on the hindgut, and induced arrhythmia in heart preparations; this arrhythmia was reversible by taurine, but not by GABA or 3-APS.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/arch.940160202
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    The oviduct musculature of the stable fly Stomoxys calcitrans: Properties of its spontaneous motility and neural regulation (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 19 (1992), S. 119-132 
    Details
    ISSN: 0739-4462
    Schlagwort(e): Diptera ; myogenic ; neurogenic ; visceral muscle ; peripheral nerve cells ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: The muscles of the stable fly oviduct were striated and in the common oviduct both circular and longitudinal fiber layers were present. Although two muscle layers were evident in the lateral oviducts, both consisted of an irregular lattice of longitudinal fibers with extensive branching. This branching between fibers seemed to provide a pathway for the spread of excitation because semi-isolated preparations of the oviduct severed from their connections to the central nervous system continued to contract in a spontaneous and rhythmic manner. Compression or shortening of the longitudinal muscles of the oviduct was the predominant mode of activity. Both phasic contractions (1-2 s in duration) and tonic events (15-30 s in duration) were observed. Innervation of the oviduct arises from the four major branches of the median abdominal nerve trunk that enter the ovipositor. Five to seven peripheral nerve cells were found along these four branches. Electrical stimulation of the severed median abdominal nerve trunk caused the oviduct to respond to a single pulse. However, these individual responses approached a fusion at 6 pulses per second (pps). Two of five preparations showed an inhibition of spontaneous phasic concentrations and a noticeable drop in baseline tonus during and after a 10-20 s interval of stimulation at a frequency of 0.5-2 pps. Endogeneous electrical activity was recorded from branch nerves in the ovipositor after connections to the central nervous system were cut. Potentials of two distinct durations were evident in this recorded activity. The significance of this and other findings are discussed.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/arch.940190205
    Standort Signatur Erwartet Verfügbarkeit
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