• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 247
  • 200
  • 36
  • 16
  • 12
  • 12
  • 6
  • 6
  • 6
  • 6
  • 6
  • 6
  • 6
  • 3
  • 3
  • Tagged with
  • 653
  • 186
  • 153
  • 129
  • 82
  • 71
  • 57
  • 47
  • 40
  • 39
  • 39
  • 37
  • 37
  • 34
  • 31
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
111

Studies on the antihaemostatic repertoire of the bloodsucking fly, Stomoxys calcitrans

Jenkin, Philip January 2001 (has links)
No description available.
112

Glândula hipofaríngeas na vespa social Polistes versicolor (Olivier): da morfologia às relações com o comportamento

Britto, Fábio Barros [UNESP] 29 June 2006 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:30:56Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-06-29Bitstream added on 2014-06-13T19:19:43Z : No. of bitstreams: 1 britto_fb_dr_rcla.pdf: 9470706 bytes, checksum: a24839a07881484e26f17ad6fe4f590b (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / As glândulas hipofaríngeas são estruturas presentes apenas na ordem Hymenoptera e apresentam-se como células epidérmicas modificadas em alguns grupos, enquanto em outros, apresentam morfologia mais elaborada, caracterizando-se como órgãos com anatomia bem definida. Muito bem estudadas em abelhas, as glândulas hipofaríngeas são glândulas exócrinas que fazem parte do sistema salivar e são responsáveis, em Apis, pela produção de substâncias que constituem a geléia real. Este produto é oferecido a todas as larvas como alimento, de maneira desigual, sendo este um fator responsável pela diferenciação das castas nas abelhas. Os objetivos do presente estudo foram analisar as glândulas hipofaríngeas de vespas, que carecem de estudos, procurando reconhecer seu papel na regulação social da colônia, bem como identificar a presença de aspectos glandulares que indicassem a ocorrência de morte celular. Utilizando Polistes versicolor, uma das espécies do gênero considerado como chave para o entendimento da evolução do comportamento social em insetos, foram realizadas análises histoquímicas, enzimológicas e ultra-estruturais das glândulas hipofaríngeas. Juntamente com estas análises foi realizado o estudo comportamental dos indivíduos analisados. Estes estudos auxiliaram no entendimento do ciclo de desenvolvimento das glândulas hipofaríngeas, bem como determinaram a constituição química da secreção glandular, representando uma contribuição inédita à identificação da morfologia e função dessas estruturas e de seu possível papel no contexto social das colônias de P. versicolor. Os resultados encontrados levam a crer que as glândulas destas vespas não estão envolvidas na produção de alimento para as larvas, como ocorre em abelhas. As características morfológicas... / The hypopharyngeal glands are structures present only in the order Hymenoptera. They are constituted by modified epidermal cells in some groups, while in others, they present a more elaborated morphology and are characterized as distinct organs with a defined anatomy. These exocrine glands are part of the salivary system and have been well studied in bees. In Apis, they are the main responsible for the production of components of royal jelly. Brood is not fed equally with royal jelly resulting in cast differentiation in this genus. The aims of the present work were to analyze the hypopharyngeal glands of the wasp Polistes versicolor in order to recognize their role in the social regulation of the colony, as well as to identify the presence of glandular features that could indicate cell death. Polistes is considered a key genus for the understanding of the evolution of social behavior in insects. In the present work we used histochemical, enzymological and ultrastructural analyses. Behavioral studies were also carried out to determine the relationship between glandular development and individual activities. These studies provided important information about the development of the hypopharyngeal glands in P. versicolor and determined the histochemical characteristics of the glandular secretion. It represents an important contribution to the identification of the morphology and the roles played by these structures in the social context of P. versicolor colonies. The results suggest that these glands are not involved in food production for the brood, unlike the observed in bees. The morphological General Abstract characteristics of the secretory cells and their secretion, as well as the behavioral characteristics of these wasps suggest that the hypopharyngeal glands of P. versicolor might be involved in the production of digestive enzymes.
113

The effects of endocrine disrupting chemicals on the sexual development of fish /

Papoulias, Diana. January 2001 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2001. / Typescript. Vita. Includes bibliographical references. Also available on the Internet.
114

The effects of endocrine disrupting chemicals on the sexual development of fish

Papoulias, Diana. January 2001 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2001. / Typescript. Vita. Includes bibliographical references. Also available on the Internet.
115

THE EFFECT OF HYPOTHALAMIC LESIONS ON THYROID FUNCTION IN COCKERELS

Gehrmann, William Henry, 1937- January 1967 (has links)
No description available.
116

Characterization of BCL11 functions in the mouse mammary gland identifies two types of mammary stem cells

Wang, Juexuan January 2012 (has links)
No description available.
117

Cell death modalities in mammary gland involution

Kreuzaler, Peter Anton January 2011 (has links)
No description available.
118

The relationship of bovine parathyroids to mammary secretion and milk constituents

Pischke, LaMonte Duane, 1930- January 1964 (has links)
No description available.
119

A comparison between the salivary physiology of the crusader bug, Mictis profana Fabricius (Coreidae) and the green lucern mirid, Creontiades dilutus (Stal) / by Gary Stewart Taylor.

Taylor, Gary Stewart January 1995 (has links)
Copies of author's previously published articles inserted. / Addendum (2 leaves) in pocket. / Bibliography :leaves 152-170. / xvi, 170 leaves : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Crop Protection, 1996
120

Effects of ovarian steroids on bovine mammary epithelial cells : in vitro and in viro evidence of indirect stimulation of proliferation /

Woodward, Terry L., January 1991 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (leavea 118-121). Also available via the Internet.

Page generated in 0.0399 seconds