Results 171 to 180 of about 10,806 (203)
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Cardioaccelerator Release in Periplaneta americana (L)
Science, 1968Focal electrical stimulation of the brain of Periplaneta americana evokes the release of a factor with high cardioaccelerator activity. Results of extirpation of components of the retrocerebral complex from an isolated head preparation imply that the corpus cardiacum is the critical component of this system.
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Phospholipid patterns of Periplaneta americana during embryogenesis
Comparative Biochemistry and Physiology, 1966Abstract The changing patterns of the phospholipids from oothecae of P. americana (L.) have been studied both qualitatively and quantitatively at successive stages of embryonic development. The phospholipids were separated by column chromatography and the component fractions identified and quantitated by thin layer chromatography. 1. 1.
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Behavioral development of the cockroach (Periplaneta americana)
Journal of Insect Physiology, 1977The 12 to 16 cockroach pharate first instar larvae (Periplaneta americana) which inhabit a single ootheca simultaneously eclose and hatch after 30 days of incubation at 29°C. Descriptions of behavior development were obtained by observing larvae which were removed from the ootheca after 16 to 18 days and incubated individually in organ culture dishes ...
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Effects of amphetamine on the cockroach Periplaneta americana
Comparative Biochemistry and Physiology Part C: Comparative Pharmacology, 1975Abstract 1. 1. Amphetamine toxicity has been studied in the cockroach Periplaneta americana . The LD 50 values were found to amount to 0.42 mg/cockroach (525 mg/kg). 2. 2. Doses of amphetamine lower than the LD 50 values brought about in the cockroach an increase in locomotor activity and a state of hyperexcitability. Doses higher than the
M, Maroli, S, Bettini
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Polyphosphate polymers during early embryogenesis of Periplaneta americana
Journal of Insect Physiology, 2008Inorganic polyphosphates (PolyP) are linear polymers of phosphate (Pi) residues linked by high-energy phosphoanhydride bonds. Despite a wide distribution, their role during insect embryogenesis has not been examined so far. In this study, we show the mobilization of PolyP polymers during the embryogenesis of the cockroach Periplaneta americana.
F M, Gomes +6 more
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Efficacy of entomopathogenic hypocrealean fungi against Periplaneta americana
Parasitology International, 2013The American cockroach Periplaneta americana, one of the worlds' most important urban insect pests was tested with entomopathogenic fungi. Most promising Metarhizium anisopliae, Metarhizium robertsii and Beauveria bassiana killed nymphs (≥ 81.7% mortality, 25 days after treatment), and these fungi developed on all dead insects.
Rayssa Fátima, Hubner-Campos +3 more
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[Chemical Constituents from Periplaneta americana].
Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials, 2016To study the chemical constituents in Periplaneta americana.The chemical constituents were separated and purified by chromatographic methods after solvent extraction and identified by spectroscopic analyses.Ten compounds were isolated from Periplaneta americana and identified as following: 8-hydroxy-3,4-dihydroquinolin-2 (1H)-one (1), cyclo-( L-Phe-L ...
Yang, Li +3 more
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Periplaneta americana perception of phytochemical naphthoquinones as allelochemicals
Journal of Chemical Ecology, 1988Electrochemistry of malePeriplaneta americana perception of naphthoquinones as allelochemicals is presented. Importance of the oxidation-reduction potential and hydrogen-bonding capabilities of the naphtho-quinone messenger to its exchange of energy with the information-encoding, redox protein of the chemosensory neuron is considered. Evidence that the
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The shadow response of the cockroach periplaneta americana
Journal of Neurobiology, 1981AbstractWe show that the “escape response” (running) of the cockroach Periplaneta americana is interrupted when the insect runs through a shadow. Shadows were cast by holding an opaque plastic sheet so that the cockroach ran beneath it. In control experiments, a similarly positioned clear plastic sheet was ineffective.
D J, Meyer, J F, Margiotta, B, Walcott
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Sterol metabolism during embryogenesis of Periplaneta americana (L.)
Journal of Insect Physiology, 1966Abstract The qualitative and quantitative metabolism of sterol and sterol esters was studied in the developing embryos of Periplaneta americana . Adult females contained 2·7 mg of sterol which consisted almost exclusively of cholesterol. The sterol content of the developing embryos remained constant though the proportion of esterified sterol ...
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