Colony Founding
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. An adaptive view of caste differentiation in the neotropical wasp Polybia (Trichothorax) sericea Olivier (Hymenoptera: Vespidae)
The tribe Epiponini comprehends the swarm-founding Neotropical wasps, with several species endemic to Brazil, which are extremely important in studies of social evolution of wasps. The Epiponini diverge in several ways from the definitions of high eusociality, since caste syndromes range from species without morphological caste differentiation to those with
Neotropical Entomology. Publicado em: 2011-12
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2. Multiple queens in founding colonies of the neotropical ant Pachycondyla striata smith (Formicidae: Ponerinae)
In social insects, the typical mode of colony foundation occurs when a single queen is inseminated by a male and establishes a new colony, although we can find interspecific and intraspecific variations in queen number and queen-mating frequencies in a single colony. This study aimed to verify the queen number in Pachycondyla striata (Smith) colonies and to
Neotropical Entomology. Publicado em: 2011-06
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3. The acceptance rate of young wasps by alien colonies depends on colony developmental stages in the swarm-founding wasp, Polybia paulista von ihering (Hymenoptera: Vespidae)
In social insects, newly emerged individuals learn the colony-specific chemical label from their natal comb shortly after their emergence. These labels help to identify each individual's colony of origin and are used as a recognition template against which individuals can discriminate nestmates from non-nestmates. Our previous studies with Polybia paulista v
Neotropical Entomology. Publicado em: 2010-12
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4. SOCIOMETRIA E COMPORTAMENTO DE RAINHAS DE SAÚVA (Atta sexdens LINNAEUS, 1758) (HYMENOPTERA: FORMICIDAE) MANTIDAS EM LABORATÓRIO
Conhecer a biologia e o comportamento de rainhas fundadoras em processo de estabelecimento de novas colônias pode ser útil para se compreender as adaptações evolutivas pelas quais passaram muitos insetos sociais. O presente estudo teve o objetivo de investigar a influência da perda de massa corporal de rainhas de A. sexdens na mortalidade, assim como na
Publicado em: 2007
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5. Comportamento predatório, dispersão e reprodução em colonias de anelosimus jabaquara (Araneae: Theridiidae), na Serra do Japi, Jundiai, SP
The predatory behavior is one of the most important aspects in formation and maintenance of social structures in spiders. The collective prey consumption in spiders colonies could promote dominance systems which result in an asymmetrical access to food. At this situation could occur an asynchronous development and differences in females nutritional state, in
Publicado em: 1999
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6. The neurological founding fathers of the National Society for Epilepsy and of the Chalfont Centre for Epilepsy.
The National Society for Epilepsy is the largest epilepsy charity in the United Kingdom, and administers the Chalfont Centre for Epilepsy. The Society was founded in London in 1892 and its first task was to establish an agricultural colony where people with epilepsy could live and work; and this was the origin of the Chalfont Centre. Recently, details of the
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7. IL-17s adopt a cystine knot fold: structure and activity of a novel cytokine, IL-17F, and implications for receptor binding
The proinflammatory cytokine interleukin 17 (IL-17) is the founding member of a family of secreted proteins that elicit potent cellular responses. We report a novel human IL-17 homolog, IL-17F, and show that it is expressed by activated T cells, can stimulate production of other cytokines such as IL-6, IL-8 and granulocyte colony-stimulating factor, and ca
Oxford University Press.
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8. The evolution of fungus-growing termites and their mutualistic fungal symbionts
We have estimated phylogenies of fungus-growing termites and their associated mutualistic fungi of the genus Termitomyces using Bayesian analyses of DNA sequences. Our study shows that the symbiosis has a single African origin and that secondary domestication of other fungi or reversal of mutualistic fungi to a free-living state has not occurred. Host switch
National Academy of Sciences.
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9. Are variations in cuticular hydrocarbons of queens and workers a reliable signal of fertility in the ant Harpegnathos saltator?
One of the key features of insect societies is the division of labor in reproduction between one or a few fertile individuals and many sterile nestmates that function as helpers. The behavioral and physiological mechanisms regulating reproduction in ant societies are still not very well understood, especially in species in which all colony members are r
The National Academy of Sciences.
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10. MRG1, the product of a melanocyte-specific gene related gene, is a cytokine-inducible transcription factor with transformation activity
Identification of cytokine-inducible genes is imperative for determining the mechanisms of cytokine action. A cytokine-inducible gene, mrg1 [melanocyte-specific gene (msg1) related gene], was identified through mRNA differential display of interleukin (IL) 9-stimulated and unstimulated mouse helper T cells. In addition to IL-9, mrg1 can be induced by other c
The National Academy of Sciences.