Tits
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Temporal differences in breeding site use between tits and mice
ABSTRACT Describing the interactions among cavity breeders is key to understanding their breeding ecology. In this study the temporal difference in cavity use between the great tit, Parus major (Linnaeus, 1758) and the small Japanese field mice, Apodemus argenteus (Temminck, 1845) is investigated, as a first step for clarifying the interaction between bird a
Zoologia (Curitiba). Publicado em: 23/10/2017
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2. O teorema da alternativa de Tits / The Tits alternative
This masters project aims to give an elementary proof of the following theorem of Tits, known as the Alternative Tits Theorem: Let G be a finitely generated linear group over a field. Then either G is solvable by finite or G contains a noncyclic free subgroup. This theorem was proved by J. Tits in 1972 [4], was considered by the mathematician J.P. Serre, as
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/06/2012
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3. Analysis of passion fruit rinds (Passiflora edulis): isoorientin quantification by HPTLC and evaluation of antioxidant (radical scavenging) capacity
The content of isoorientin in passion fruit rinds (Passiflora edulis fo. flavicarpa O. Degener) was determined by HPTLC (high performance thin layer chromatography) with densitometric analysis. The results revealed a higher amount of isoorientin in healthy rinds of P. edulis (92.275 ± 0.610 mg L-1) than in rinds with typical symptoms of PWV (Passion fruit W
Química Nova. Publicado em: 2012
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4. Vaccínia bovina no estado de Minas Gerais, 2005-2007
This study aimed to find factors related to the clinical epidemiology of bovine vaccinia in Minas Gerais. A case-control study was structured and 25 cases and 47 controls properties were visited. Data were collected from January-2005 to December-2007. In each of the sampled properties a questionnaire was applied in order to obtain information on the characte
Publicado em: 2009
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5. Edificios de tits, aplicações a teoria dos codigos e sistemas geometricos
Neste trabalho apresentamos de forma detalhada diversos resultados da Teoria dos Códigos sob o ponto de vista dos sistemas projetivos, incluindo os pesos generalizados de Hamming e as generalizações dos limitantes de Singleton, Griesmer e Plotkin. (...continua)
Publicado em: 2003
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6. A larger hippocampus is associated with longer-lasting spatial memory
Volumetric studies in a range of animals (London taxi-drivers, polygynous male voles, nest-parasitic female cowbirds, and a number of food-storing birds) have shown that the size of the hippocampus, a brain region essential to learning and memory, is correlated with tasks involving an extra demand for spatial learning and memory. In this paper, we repor
The National Academy of Sciences.
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7. Kin discrimination in cooperatively breeding long-tailed tits.
Long-tailed tits Aegithalos caudatus are cooperative breeders in which helpers exhibit a kin preference in their cooperative behaviour. We investigated the mechanism through which this preference is achieved by first conducting an experiment for testing whether breeders could recognize the calls of their relatives while controlling for spatial effects. We fo
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8. Immune challenge affects basal metabolic activity in wintering great tits.
The costs of exploiting an organism's immune function are expected to form the basis of many life-history trade-offs. However, there has been debate about whether such costs can be paid in energetic and nutritional terms. We addressed this question in a study of wintering, free-living, male great tits by injecting them with a novel, non-pathogenic antigen (s
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9. Male great tits eavesdrop on simulated male-to-male vocal interactions.
Animal communication generally occurs in the environment of a network of several potential signallers and receivers. Within a network environment, it is possible to gain relative information about conspecifics by eavesdropping on signalling interactions. We presented male great tits with the opportunity to gain such information by simulating singing interact
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10. Fat reserves and perceived predation risk in the great tit, Parus major.
The fat reserves of small birds are built up daily as insurance against starvation. They are believed to reflect a trade-off between the risks of starvation and predation such that in situations of high predation risk birds are expected either to reduce their fat reserves in response to mass-dependent predation risk or to increase them in response to foragin
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11. Decline in the frequency and benefits of multiple brooding in great tits as a consequence of a changing environment
For multiple-brooded species, the number of reproductive events per year is a major determinant of an individual's fitness. Where multiple brooding is facultative, its occurrence is likely to change with environmental conditions, and, as a consequence, the current rates of environmental change could have substantial impacts on breeding patterns. Here we exam
The Royal Society.
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12. Stress hormone dynamics: an adaptation to migration?
The hormone corticosterone (CORT) is an important component of a bird’s response to environmental stress, but it can also have negative effects. Therefore, birds on migration are hypothesized to have repressed stress responses (migration-modulation hypothesis). In contrast to earlier studies on long-distance migrants, we evaluate this hypothesis in a popul
The Royal Society.