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1Author    K. H. Trautmann, A. Schuler, Dr Maag, Ag Dielsdorf, SchweizM. Suchý, H.-K WipfRequires cookie*
 Title    Eine  
 Abstract    Methode zur qualitativen und quantitativen Bestimmung von drei Juvenilhormonen von Insekten Nachweis von 10.1 l-Epoxy-3.7.1 l-trimethyl-2-frans-6-//-ons-dodecadiensäuremethyl-ester in Melolontha melolontha A Method for the Qualitative and Quantitative Determination of Three Natural Insect Juvenile Hormones Evidence of Methyl 10,ll-epoxy-3,7,ll-trimethyl-2-/rans-6-*ran.s-dodecadienoate in Melolontha melolontha A method is presented permitting the qualitative and quantitative determination of all three presently known hormones (J H 1 —3). The determination is based on the method of radioactive isotope dilution, whereby a very small known amount of tritium-labelled JH-1 is added to the ether extract of the particular species. The addition of radioactive JH-1 permits the isolation of all three hormones, because of their similar behaviour during the chosen work up. The quantitative determination was carried out by gas chromatography and the identification was confirmed with the help of retention-times and GC-MS combination. The method was checked by using an extract of Hyalophora cecropia. For the first time methyl 10,ll-epoxy-3,7,ll-trimethyl-2-frans-6-/rans-dodecadienoate (JH-3) could also be identified as the juvenile hormone of Melo­ lontha melolontha. In Vanessa io larvae, Tenebrio molitor larvae and adults and in Musca domestica larvae none of the three known hormones could be detected. The preparation of JH-1 labelled with tritium in the methyl group of the ester was accomplished with very high specific activity (4.34 Ci/mmol) of the tritiated acid with diazomethane. 
  Reference    (Z. Naturforsch. 29c, 161—168 [1974]; eingegangen am 12. Dezember 1973) 
  Published    1974 
  Keywords    Quantitative Determination, Insects, Juvenile Hormones 
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 TEI-XML for    default:Reihe_C/29/ZNC-1974-29c-0161.pdf 
 Identifier    ZNC-1974-29c-0161 
 Volume    29 
2Author    L. W. Van Broekhoven, A. C. Van Der Kerk, -Van Hoof, C. A. SaleminkRequires cookie*
 Title    Gas Chromatographie Determination of Subnanogram Amounts of the Juvenile Hormone Methyl (2E, 6E)-10,ll-epoxy-3,7,ll-tri- methyl-2,6-dodecadienoate (JH III) in Insect Material by Electron Capture Detection  
 Abstract    Using an electron capture detector, a sensitive gas chromatographic method has been developed for the determination of the juvenile hormone methyl(2E, 6E)-lOjll-epoxy-SJjll-trimethyl-^ö-dodecadienoate (JH III) in insect material. The sensitivity in electron capture detection of the bisheptafluorobutyrate was determined. The work-up procedure was checked by adding known amounts of JH III to insect material. The method seems equally applicable to all three juvenile hormones. 
  Reference    (Z. Naturforsch. 30c, 726—729 [1975]; received May 28 1975) 
  Published    1975 
  Keywords    Quantitative Determination, Electron Capture Detection, Insects, Juvenile Hormone 
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 TEI-XML for    default:Reihe_C/30/ZNC-1975-30c-0726.pdf 
 Identifier    ZNC-1975-30c-0726 
 Volume    30 
3Author    G. S. Dogra, G. M. Ulrich, H. RemboldRequires cookie*
 Title    A Comparative Study of the Endocrine System of the Honey Bee Larvae under Normal and Experimental Conditions  
 Abstract    The endocrine system of the honey bee (Apis mellifera L.) has been studied morphologically through post-embryonic development with several histological techniques. Marked differences in the structure of the neurosecretory complex of queen and worker larvae have been observed during larval stages. In queen larvae, morphogenesis of the neurosecretory cells, their axons and the formation of the chiasma takes place during end of 2nd and beginning of 3rd, in the workers at beginning of 4th larval instar. Stainable neurosecretory material was found in queen larvae at the beginning, in worker larvae at the end of 4th instar. In early larval stages, the corpora allata are more active in the queen. During initial 3 — 5 days of larval development the gland volume is reduced in both castes. After 36 to 48 hours of endocrine retardation, the glands become active again. The same histological effects are found under experimental conditions, where worker larvae of 2nd instar were reared in the incubator on basic food, Royal Jelly and with topically applied juvenile hormone I. 
  Reference    (Z. Naturforsch. 32c, 637 [1977]; received February 9 1976/April 4 1977) 
  Published    1977 
  Keywords    Insect, Endocrinology, Honey Bee, Caste Determination, Juvenile Hormone 
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 TEI-XML for    default:Reihe_C/32/ZNC-1977-32c-0637.pdf 
 Identifier    ZNC-1977-32c-0637 
 Volume    32 
4Author    David Dvorak, Allan SnyderRequires cookie*
 Title    The Relationship between Visual Acuity and Illumination in the Fly, Lucilia sericata  
 Abstract    The variation in visual acuity with illumination has been studied by monitoring the extracellular response of direction sensitive motion detecting neurons to a drifting sine wave grating displayed upon an oscilloscope spreen. Acuity reaches a maximum value of 0.46 cycles/degree at luminances above 1.0 cd/m2 and decreases gradually over a 3.8 log unit attenuation in intensity to a minimum value of 0.05 cycles/degree. The results have been compared with theoretical acuity curves for the coupound eye with various dark adaptation mechanisms. The analysis indicates that a major strategy of dark adaptation in the fly is a process involving intensity-dependent neural summation of signals from photoreceptors having different visual axes. 
  Reference    Z. Naturforsch. 33c, 139 (1978); received November 9 1977 
  Published    1978 
  Keywords    Diptera, Insect, Vision, Visual Acuity, Electrophysiology 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0139.pdf 
 Identifier    ZNC-1978-33c-0139 
 Volume    33 
5Author    Wolfgang Steer, G.Erhard BraunitzerRequires cookie*
 Title    Chironomus thummi thummi (Insecta Diptera) The Sequence of a Dimeric Hemoglobin (Erythro­ cruorin), Com ponent IX, from Chironomus thummi thummi (Insecta Diptera)  
 Abstract    The primary structure o f the dimeric hemoglobin (erythro­ cruorin) CTT-IX from the insect larva Chironomus thummi thummi (Insecta Diptera) is given. The sequence was deter­ mined automatically. The primary structure is compared with human a-chains. 
  Reference    Z. Naturforsch. 34c, 882—884 (1979); eingegangen am 16. Mai 1979 
  Published    1979 
  Keywords    Dimeric Hem oglobin, Primary Structure, Insects 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0882_n.pdf 
 Identifier    ZNC-1979-34c-0882_n 
 Volume    34 
6Author    Hartm Ut KayserRequires cookie*
 Title    Carotenoid Biogenesis in the Stick Insect, Carausius morosus, during a Larval Instar  
 Abstract    [14C]/?-Carotene was fed to juvenile stick insects, Carausius morosus, o f the fifth instar. Radio­ activity was incorporated into 2-hydroxy-, 2-oxo-, and 3,4-didehydro-2-oxo-carotenoids o f the ß,ß-type. These transformations are due to the insect's own capacity; any contribution by microbial symbionts can be ruled out. A study on the labelling kinetics clearly shows that the biogenesis of hydroxy-and oxo-carotenoids is correlated to a decrease in the carotene precursor, but only up to mid instar. Thereafter, oxidation o f the carotene is very low but the transformations of its metabolites continue as before. Predominantly ß,^-carotene-2,2'-diol is dehydrogenated to 3,4,3',4'-tetradehydro-/?,/?-carotene-2,2'-dione via two hydroxyketones. This discontinuous utilization o f /7-carotene could be due to a stop at mid instar either in the oxidation or in the absorption in the gut o f this precursor. 
  Reference    Z. Naturforsch. 37c, 13 (1982); received September 11/October 281981 
  Published    1982 
  Keywords    Carotenoids, Metabolism, [14C]/?-Carotene, Insects, Carausius morosus 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0013.pdf 
 Identifier    ZNC-1982-37c-0013 
 Volume    37 
7Author    H. Artm, Ut KayserRequires cookie*
 Title    De novo Synthesis and Levels of Cytochrome c and a Biliprotein during Pupal-Adult Development of a Butterfly, Pieris brassicae  
 Abstract    Using a sensitive pH-difference spectroscopic method in combination with a three-column procedure of ion-exchange chromatography (overall yield 94%) the levels o f cytochrome c in the large white butterfly, Pieris brassicae, were determined from the last larval instar to the adult 
  Reference    Z. Naturforsch. 39c, 938—947 (1984); received May 21/July 25 1984 
  Published    1984 
  Keywords    Cytochrome c, Biliprotein, Biosynthesis, Development, Insects 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0938.pdf 
 Identifier    ZNC-1984-39c-0938 
 Volume    39 
8Author    K. KirschfeldRequires cookie*
 Title    The Effect of Volatile Anesthetics on Giant Neurons in the Lobula Plate in the Fly  
 Abstract    Movement sensitive giant neurons in the lobula plate of the fly (H,-neurons, V-neurons) are affected by low con­ centrations of volatile anesthetics (halothane, N20): the spike frequency generated by motion in the preferred di­ rection decreases, that in the opposite direction increases. This means that the response to the motion stimulus de­ fined as the spike frequency modulation decreases. Higher concentrations of the anesthetics lead to an increasing spike frequency which is unaffected by the motion stimulus, until eventually no spikes are generated any longer. The results are in agreement with the assumption that the anesthetics increase the membrane permeability of these neurons. 
  Reference    Z. Naturforsch. 41c, 1137—1138 (1986); received September 17 1986 
  Published    1986 
  Keywords    Insect, Central Nervous System, Halothane, Nitrous Oxide 
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 TEI-XML for    default:Reihe_C/41/ZNC-1986-41c-1137_n.pdf 
 Identifier    ZNC-1986-41c-1137_n 
 Volume    41 
9Author    K. KirschfeldRequires cookie*
 Title    Navigation and Compass Orientation by Insects According to the Polarization Pattern of the Sky  
 Abstract    A recent theory attempts to explain how bees take their compass orientation from the pattern of polarized light in the sky (S. Rossel and R. Wehner, Nature 323, 128-131 (1986)). According to this theory, orientation can be erroneous and lead to the wrong course of a recruited bee in search of the foraging site whenever only a small patch of the blue sky is visible to the bee. It is shown that orientation under natural conditions is not erroneous, if the compass reference is variable in time but equally defined for both, scout bees and recruits. 
  Reference    Z. Naturforsch. 43c, 467—469 (1988); received January 25 1988 
  Published    1988 
  Keywords    Navigation, Compass Orientation, e-Vector, Insect, Bee 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0467.pdf 
 Identifier    ZNC-1988-43c-0467 
 Volume    43 
10Author    Jürgen Jacob3, Gottfried Raab3, Udo HoppebRequires cookie*
 Title    Surface Lipids of the Silverfish (Lepisma saccharina L.)  
 Abstract    Surface lipids obtained from the silverfish by short-term solvent extraction contain ali­ phatic hydrocarbons, monoester waxes, cholesteryl esters, triglycerides, free cholesterol, and free fatty acids. Together, cholesteryl esters and free cholesterol account for >30% of the total lipids. As found for other arthropods living in aquatic or moist environments unsaturated homo-logues predominate among the acidic constituents. The cuticular lipid composition o f silverfish resembles that of other more primitive arthro­ pod forms such as stoneflies and dragonflies. 
  Reference    Z. Naturforsch. 52c, 109—113 (1997); received October 4/October 29 1996 
  Published    1997 
  Keywords    Insects, Zygentoma, Cuticular Lipids, Chemotaxonomy, 3-Methylalkanes 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0109.pdf 
 Identifier    ZNC-1997-52c-0109 
 Volume    52 
11Author    Ruth MarxRequires cookie*
 Title    Characterization of the Nuclear Lamina in an Insect by Differential Staining  
 Abstract    The nuclear envelope of the larval fat body in the blow­ fly Calliphora vicina reveals a conspicuous nuclear lamina. It appears homogeneous, Fibrous or granular depending upon the fixing and staining methods. The best relative contrast for the nuclear lamina and the nuclear pore com­ plex is obtained with a phosphotungstic acid staining pro­ cedure designed for proteins. 
  Reference    Z. Naturforsch. 37c, 345—347 (1982); received October 29 1981 
  Published    1982 
  Keywords    Nuclear Lamina, Insect, Fat Body, Phosphotungstic Acid, Protein Staining 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0345_n.pdf 
 Identifier    ZNC-1982-37c-0345_n 
 Volume    37 
12Author    Ch Giese, K. D. Spindler, H. EmmerichRequires cookie*
 Title    The Solubility of Insect Juvenile Hormone in Aqueous Solutions and Its Adsorption by Glassware and Plastics  
 Abstract    The C18 juvenile hormone of insects can be dissolved in aqueous solutions up to a concentration of 2.5 — 3.0 X 10-5 m; changes in pH, buffer composition and ionic strength hardly affect this solu­ bility. The hormone is salted out gradually by increasing ammonium sulphate concentrations. The juvenile hormone is bound to proteins such as bovine serum albumin or goat immunoglobulin G and can be kept in solution by these proteins up to 1-0—3 m. The hormone is strongly absorbed by many commonly used plastic materials but only to a lesser extent by glass and teflon. 
  Reference    (Z. Naturforsch. 32c, 158 [1977]; received November 11 1976) 
  Published    1977 
  Keywords    Juvenile Hormone Solubility, Juvenile Hormone Adsorption, Juvenile Hormone Binding to Proteins, Insects 
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 TEI-XML for    default:Reihe_C/32/ZNC-1977-32c-0158.pdf 
 Identifier    ZNC-1977-32c-0158 
 Volume    32 
13Author    Jürgen Jacob, Hans-Peter HanssenRequires cookie*
 Title    The Chemical Composition of Cuticular Lipids from Dragonflies (Odonata) A h rensburg/Holst, and  
  Reference    Z. Naturforsch. 34c, 498—502 (1979); received March 20 1979 
  Published    1979 
  Keywords    Cuticular Lipids, Branched Hydrocarbons, Waxes, Triglycerides, Free Fatty Acids, Insects, D ra­ gonflies, Chem otaxonom y 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0498.pdf 
 Identifier    ZNC-1979-34c-0498 
 Volume    34