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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Insect Physiology 18 (1972), S. 317-337 
    ISSN: 0022-1910
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    International Journal of Insect Morphology and Embryology 17 (1988), S. 135-143 
    ISSN: 0020-7322
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Insect Physiology 16 (1970), S. 2051-2062 
    ISSN: 0022-1910
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Insect Physiology 19 (1973), S. 1449-1453 
    ISSN: 0022-1910
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Insect Physiology 37 (1991), S. 805-816 
    ISSN: 0022-1910
    Keywords: Pyrrhocoris apterus ; Vitellogenin ; allatectomy ; juvenile hormone analogue ; ovariectomy ; polyacrylamide gel electrophoresis, immunoblotting ; vitellin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 37 (1981), S. 1029-1030 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary While it is clear that juvenile hormone analogues disturb metamorphosis, there is some controversy about their effect on the activity of the corpus allatum in the course of metamorphosis. The present experiments showed that juvenile hormone analogues applied to eggs did not prevent inactivation of the corpus allatum at the onset of the last larval instar ofPyrrhocoris apterus.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 38 (1982), S. 977-979 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Precocene II (P II) was applied to the adult females of 2 Pyrrhocorid bugs —Pyrrhocoris apterus (insensitive to P II) andDysdercus cingulatus (sensitive to P II)-subjected to allatectomy and intraspecific or interspecific reimplantations of corpus allatum (CA). The failure of P II to inhibit ovarian development inP. apterus appears to be caused by both a low sensitivity to P II of the CA itself and unknown ‘anti-precocene mechanisms’ outside the CA.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of insect behavior 13 (2000), S. 741-750 
    ISSN: 1572-8889
    Keywords: wing movement behavior ; Pyrrhocoris apterus ; wing morphs ; flightless bugs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aim of the present paper was to study, with the use of video-recordering and computerized methods, the flight and wing movement behavior in two wing morphs of the flightless bug Pyrrhocoris apterus during the first 14 days of their adult life. We demonstrated the capability of macropterous males and females of this heteropteran to flap their fore- and hindwings for the first time. Flight was not observed in any of the tested males and females. We revealed that wing flapping does not occur earlier than on the fourth and fifth day after adult emergence in males and females, respectively. Time-series analysis of the obtained data showed that the maximum activity of wing flaps is limited to the light phase of the 12-h light/12-h dark photocycle, with the peak occurring in the morning, i.e., about 3 h after turning the light on. No substantial differences in the peaks of wing flapping activities in males versus females were found. The present paper is the first experimental demonstration of wing flap activity in a representative species with a “nonfunctional” alary polymorphism.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Reaction kinetics and catalysis letters 14 (1980), S. 119-128 
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Было найдено, что углеводы, присутствующие в количествах м.д. в параформальдегидных растворов. Параформальдегид, сублимированный в суспензию Ca(OH)2, не превращается в сахара формозной реакцией, а лишь в метанол и формат с помощью реакцией, а лишь в метанол и формат с помощью реакции Канницаро. Небольшие следы гликольальдегида — 3 м.д. — были достаточны для инициирования обычного автокатализа. Для формозной реакции предлагается схема, в которой формальдегид реагирует лишь с сахарами с помощью альдольной конденсации, а не сам с собой.
    Notes: Abstract It has been found that carbohydrates naturally present in ppm quantities in paraformaldehyde are the cause of the autocatalysis in the formose reaction of paraformaldehyde solutions. Paraformaldehyde sublimed into Ca(OH)2 suspension was not transformed to sugars by formose reaction, only to methanol and formate by Cannizzaro reaction. A minute trace of glycolaldehyde — 3 ppm — was sufficient to initiate conventional autocatalysis. A formose reaction scheme in which formaldehyde reacts only with sugars by aldol condensation but not with itself is proposed.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of comparative physiology 166 (1996), S. 382-387 
    ISSN: 1432-136X
    Keywords: Haemolymph proteins ; Reproduction arrest ; Diapause ; Wing dimorphism ; Firebug,Pyrrhocoris
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Three different cultures of dimorphic bug,Pyrrhocoris apterus, were analyzed concerning diapause and its relation to wing morph pattern. The proportion of macropterous bugs was considerably higher (36%) in the Mediterranean culture from Israel than that (1.3%) in the temperate culture from the Czech Republic. The macropterous morph- and brachypterous morphrelated types of reproduction arrest, differing by the length of pre-oviposition period, were distinguished in cultures analyzed. The reproduction arrest with an average pre-oviposition period of 38.2 days in Mediterranean macropters and 18.5 days in macropters from selected macropterous strain, was found to be typical for macropterous morph. Two different photoperiodic conditions induced macropterous morph-related reproduction arrest, the long-day (18 h light-6 h dark) photoperiod in macropterous strain macropters and the short-day (12 h light-12 h dark) photoperiod in Mediterranean macropters. The brachypterous morph-related reproduction arrest, characterized by pre-oviposition period longer than 90 days, occurred predominantly in diapausing brachypterous bugs. While the hibernal diapause of brachypterous bugs was characterized by a very high level of the 78- and 82-kDa proteins in haemolymph, their content in haemolymph of macropters during macropterous morph-related reproduction arrest was almost as low as in the reproductive adults. The variation of reproduction arrest in relation to wing dimorphism represents an important feature in the life strategy ofP. apterus.
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