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Carminda Da Cruzlandim - One of the best experts on this subject based on the ideXlab platform.

  • hydrolases in the Hypopharyngeal Glands of workers of scaptotrigona postica and apis mellifera hymenoptera apinae
    Genetics and Molecular Research, 2005
    Co-Authors: Rosileia A C Costa, Carminda Da Cruzlandim
    Abstract:

    Hydrolytic enzymes from Hypopharyngeal gland extracts of newly emerged, nurse and foraging workers of two eusocial bees, Scaptotrigona postica, a native Brazilian stingless bee, and the Africanized honey bee (Apis mellifera) in Brazil, were compared. The Hypopharyngeal gland is rich in enzymes in both species. Fifteen different enzymes were found in the extracts, with only a few quantitative differences between the species. Some of the enzymes present in the extracts may have intracellular functions, while others seem to be digestive enzymes. Scaptotrigona postica, had lower beta-glucosidase and higher lipase esterase activities than A. mellifera. The differences may be due to different feeding habits and behavioral peculiarities of the two species.

  • comparative study of the ultrastructure and secretory d ynamic of Hypopharyngeal Glands in queens workers and males of scaptotrigona postica latreille hymenoptera apinae meliponini
    Biocell, 2000
    Co-Authors: Rosileia A C Costa, Carminda Da Cruzlandim
    Abstract:

    The secretory cycle of Hypopharyngeal Glands (HPGs) in Scaptotrigona postica resembles that of Apis mellifera: in newly emerged workers the HPGs are in prefunctional state, their maximum development happens in the nurse workers and in forager workers they show signs of reabsorption. In S. postica these Glands are also present in queens and males where they are more developed in newly emerged individuals. The ultrastructural features of the HPG secretory cycle in workers of S. postica and A. mellifera are alike: granular endoplasmic reticulum well developed, large secretion masses around the intracellular canaliculus in nurse workers and extensive degenerative structures in forager workers. Then it is suggested that the HPG secrete similar substances in both species. A second secretory cycle seems to occur in early foragers, may be with production of enzymes. The role of the HPGs in queens and males remains unknown but one possibility is enzyme production.

  • occurrence and morphometry of the Hypopharyngeal Glands in scaptotrigona postica lat hymenoptera apidae meliponinae
    Journal of Biosciences, 1999
    Co-Authors: Rosileia A C Costa, Carminda Da Cruzlandim
    Abstract:

    As compared toApis mellifera where only workers have Hypopharyngeal Glands, inScaptotrigona postica, these Glands occur in workers, queens and males. They are composed of two long axial ducts with many unicellular secretory alveoli interconnected by secretory canaliculi. The axial ducts are longer in males than in workers, but the alveolar areas of queens and males are generally smaller. In workers the alveoli have their greatest size in the nurses or middle-aged individuals while in queens and males they are larger in newly emerged individuals. The results indicate that the Glands in workers may produce food for the brood as inA. mellifera, since they are well developed in the nurse workers. However, the function of the Glands in queens and males remains to be clarified since these individuals have no part in brood care.

  • electrophoretical polypeptide pattern of Hypopharyngeal Glands extracts from workers and males of scaptotrigona postica latr hymenoptera apidae meliponinae
    Netherlands Journal of Zoology, 1999
    Co-Authors: Rosileia A C Costa, Carminda Da Cruzlandim
    Abstract:

    In S. postica the Hypopharyngeal Glands are present in workers, males and queens. The Glands of newly emerged workers are in a prefunctional phase, in nurse workers they reach their highest development and in forager workers they suffer reabsorption. The newly emerged males and queens, however, have well developed Glands that soon start involution. The electrophoretical pattern of worker and male Hypopharyngeal Glands is compared with the pattern of nurse workers of A. mellifera. The results show simularities, as well as differences among the S. postica males and workers, and among the phases of worker life. The electrophoretic band pattern suggests that the Hypopharyngeal Glands of nurse workers of S. postica produce substances similar to the ones produced by A. mellifera. The similarity of the extracts of nurse Glands of A. mellifera and S. postica, as well as the behavioural similarities of the workers, suggest the same function of this gland in both species.

Flavio Henrique Caetano - One of the best experts on this subject based on the ideXlab platform.

Fabio Barros Britto - One of the best experts on this subject based on the ideXlab platform.

Rosileia A C Costa - One of the best experts on this subject based on the ideXlab platform.

  • hydrolases in the Hypopharyngeal Glands of workers of scaptotrigona postica and apis mellifera hymenoptera apinae
    Genetics and Molecular Research, 2005
    Co-Authors: Rosileia A C Costa, Carminda Da Cruzlandim
    Abstract:

    Hydrolytic enzymes from Hypopharyngeal gland extracts of newly emerged, nurse and foraging workers of two eusocial bees, Scaptotrigona postica, a native Brazilian stingless bee, and the Africanized honey bee (Apis mellifera) in Brazil, were compared. The Hypopharyngeal gland is rich in enzymes in both species. Fifteen different enzymes were found in the extracts, with only a few quantitative differences between the species. Some of the enzymes present in the extracts may have intracellular functions, while others seem to be digestive enzymes. Scaptotrigona postica, had lower beta-glucosidase and higher lipase esterase activities than A. mellifera. The differences may be due to different feeding habits and behavioral peculiarities of the two species.

  • comparative study of the ultrastructure and secretory d ynamic of Hypopharyngeal Glands in queens workers and males of scaptotrigona postica latreille hymenoptera apinae meliponini
    Biocell, 2000
    Co-Authors: Rosileia A C Costa, Carminda Da Cruzlandim
    Abstract:

    The secretory cycle of Hypopharyngeal Glands (HPGs) in Scaptotrigona postica resembles that of Apis mellifera: in newly emerged workers the HPGs are in prefunctional state, their maximum development happens in the nurse workers and in forager workers they show signs of reabsorption. In S. postica these Glands are also present in queens and males where they are more developed in newly emerged individuals. The ultrastructural features of the HPG secretory cycle in workers of S. postica and A. mellifera are alike: granular endoplasmic reticulum well developed, large secretion masses around the intracellular canaliculus in nurse workers and extensive degenerative structures in forager workers. Then it is suggested that the HPG secrete similar substances in both species. A second secretory cycle seems to occur in early foragers, may be with production of enzymes. The role of the HPGs in queens and males remains unknown but one possibility is enzyme production.

  • occurrence and morphometry of the Hypopharyngeal Glands in scaptotrigona postica lat hymenoptera apidae meliponinae
    Journal of Biosciences, 1999
    Co-Authors: Rosileia A C Costa, Carminda Da Cruzlandim
    Abstract:

    As compared toApis mellifera where only workers have Hypopharyngeal Glands, inScaptotrigona postica, these Glands occur in workers, queens and males. They are composed of two long axial ducts with many unicellular secretory alveoli interconnected by secretory canaliculi. The axial ducts are longer in males than in workers, but the alveolar areas of queens and males are generally smaller. In workers the alveoli have their greatest size in the nurses or middle-aged individuals while in queens and males they are larger in newly emerged individuals. The results indicate that the Glands in workers may produce food for the brood as inA. mellifera, since they are well developed in the nurse workers. However, the function of the Glands in queens and males remains to be clarified since these individuals have no part in brood care.

  • electrophoretical polypeptide pattern of Hypopharyngeal Glands extracts from workers and males of scaptotrigona postica latr hymenoptera apidae meliponinae
    Netherlands Journal of Zoology, 1999
    Co-Authors: Rosileia A C Costa, Carminda Da Cruzlandim
    Abstract:

    In S. postica the Hypopharyngeal Glands are present in workers, males and queens. The Glands of newly emerged workers are in a prefunctional phase, in nurse workers they reach their highest development and in forager workers they suffer reabsorption. The newly emerged males and queens, however, have well developed Glands that soon start involution. The electrophoretical pattern of worker and male Hypopharyngeal Glands is compared with the pattern of nurse workers of A. mellifera. The results show simularities, as well as differences among the S. postica males and workers, and among the phases of worker life. The electrophoretic band pattern suggests that the Hypopharyngeal Glands of nurse workers of S. postica produce substances similar to the ones produced by A. mellifera. The similarity of the extracts of nurse Glands of A. mellifera and S. postica, as well as the behavioural similarities of the workers, suggest the same function of this gland in both species.

Robi F A Moritz - One of the best experts on this subject based on the ideXlab platform.

  • how honeybees defy gravity with royal jelly to raise queens
    Current Biology, 2018
    Co-Authors: Anja Uttsted, Carme I Muresa, Hauke Lilie, Gerd Hause, Christia Ihling, Stefanh Schulze, Markus Pietzsch, Robi F A Moritz
    Abstract:

    Summary The female sex in honeybees ( Apis spp. ) comprises a reproductive queen and a sterile worker caste. Nurse bees feed all larvae progressively with a caste-specific food jelly until the prepupal stage. Only those larvae that are exclusively fed a large amount of royal jelly (RJ) develop into queens [1]. RJ is a composite secretion of two specialized head Glands: the mandibular Glands, which produce mainly fatty acids [2], and the Hypopharyngeal Glands, which contribute proteins, primarily belonging to the major royal jelly protein (MRJP) family [3]. Past research on RJ has focused on its nutritional function and overlooked its central role with regard to the orientation of the larva in the royal brood cell. Whereas workers are reared in the regular horizontal cells of the comb, the queen cells are specifically built outside of the normal comb area to accommodate for the larger queen [4, 5]. These cells hang freely along the bottom of the comb and are vertically oriented, opening downward [6]. Queen larvae are attached by their RJ diet to the cell ceiling. Thus, the physical properties of RJ are central to successful retention of larvae in the cell. Here, we show that the main protein of RJ (MRJP1) polymerizes in complex with another protein, apisimin, into long fibrous structures that build the basis for the high viscosity of RJ to hold queen larvae on the RJ surface.