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'Insect' in keywords Facet   Publication Year 1977  [X]
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1Author    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 
2Author    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