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Search Results: 1 - 10 of 1589 matches for " Hamilton JGC "
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Isolation and Identification of 9-methylgermacrene-B as the Putative Sex Pheromone of Lutzomyia cruzi (Mangabeira, 1938) (Diptera: Psychodidae)
Brazil, Reginaldo P;Hamilton, JGC;
Memórias do Instituto Oswaldo Cruz , 2002, DOI: 10.1590/S0074-02762002000300030
Abstract: lutzomyia (lutzomyia) cruzi has been named as a probable vector of leishmania chagasi in corumbá, mato grosso do sul, brazil. taxonomically l. cruzi is closely related to the l. longipalpis species complex. females of l. cruzi and l. longipalpis are morphologically indistinguishable and associated males must be examined carefully to confirm identifications. chemical analysis hexane extracts of male l. cruzi has revealed the presence of a 9-methylgermacrene-b (c16), a homosesquiterpene (mw 218) previously shown to be the sex pheromone of one of the members of the l. longipalpis species complex.
Isolation and Identification of 9-methylgermacrene-B as the Putative Sex Pheromone of Lutzomyia cruzi (Mangabeira, 1938) (Diptera: Psychodidae)
Brazil Reginaldo P,Hamilton JGC
Memórias do Instituto Oswaldo Cruz , 2002,
Abstract: Lutzomyia (Lutzomyia) cruzi has been named as a probable vector of Leishmania chagasi in Corumbá, Mato Grosso do Sul, Brazil. Taxonomically L. cruzi is closely related to the L. longipalpis species complex. Females of L. cruzi and L. longipalpis are morphologically indistinguishable and associated males must be examined carefully to confirm identifications. Chemical analysis hexane extracts of male L. cruzi has revealed the presence of a 9-methylgermacrene-B (C16), a homosesquiterpene (mw 218) previously shown to be the sex pheromone of one of the members of the L. longipalpis species complex.
Courtship behaviour of Phlebotomus papatasi the sand fly vector of cutaneous leishmaniasis
Chelbi Ifhem,Bray DP,Hamilton JGC
Parasites & Vectors , 2012, DOI: 10.1186/1756-3305-5-179
Abstract: Background The sand fly Phlebotomus papatasi is an Old World vector of Leishmania major, the etiologic agent of zoonotic cutaneous leishmaniasis. This study describes the courtship behaviour of P. papatasi and compares it with that of Lutzomyia longipalpis, the New World vector of visceral leishmaniasis. Understanding the details of courtship behaviour in P. papatasi may help us to understand the role of sex pheromones in this important vector. Results P. papatasi courtship was found to start with the female touching the male, leading him to begin abdomen bending and wing flapping. Following a period of leg rubbing and facing, the male flaps his wings while approaching the female. The female then briefly flaps her wings in response, to indicate that she is willing to mate, thereby signaling the male to begin copulation. Male P. papatasi did not engage in parading behaviour, which is performed by male L. longipalpis to mark out individual territories during lekking (the establishment and maintenance of mating aggregations), or wing-flap during copulation, believed to function in the production of audio signals important to mate recognition. In P. papatasi the only predictor of mating success for males was previous copulation attempts and for females stationary wing-flapping. By contrast, male L. longipalpis mating success is predicted by male approach-flapping and semi-circling behaviour and for females stationary wing-flapping. Conclusions The results show that there are important differences between the mating behaviours of P. papatasi and L. longipalpis. Abdomen bending, which does not occur in L. longipalpis, may act in the release of sex pheromone from an as yet unidentified site in the male abdomen. In male L. longipalpis wing-flapping is believed to be associated with distribution of male pheromone. These different behaviours are likely to signify significant differences in how pheromone is used, an observation that is consistent with field and laboratory observations.
Identification of sex pheromones of Lutzomyia longipalpis (Lutz & Neiva, 1912) populations from the state of S?o Paulo, Brazil
Casanova, Cláudio;Hamilton, JGC;Trigo, JR;Costa, Antonio IP;
Memórias do Instituto Oswaldo Cruz , 2006, DOI: 10.1590/S0074-02762006000100023
Abstract: in brazil, four populations of lutzomyia longipalpis each producing different sex pheromones are recognised. it has been suggested that these chemotype populations represent true sibling species. in this study we present the results of an analysis, by coupled gas cromotography - mass spectrometry, of the pheromones of males l. longipalpis from two different municipalities of the state of s?o paulo. our study showed that l. longipalpis from these two municipalities produced different sex pheromones from each other. this coupled with the remarkable difference between the epidemiological situation in ara?atuba and espírito santo do pinhal, suggests that the (s)-9-methylgermacrene-b and cembrene-1 populations may have different vectorial capacities.
Genetic aspects of meat quality and stress resistance in experiments with various breeds and breed crosses
P Walstra, D Minkema, W Sybesma, JGC Pas
Genetics Selection Evolution , 1972, DOI: 10.1186/1297-9686-4-1-133a
Abstract:
O revivescimento da aprendizagem?
Hamilton, David;
Educa??o & Sociedade , 2002, DOI: 10.1590/S0101-73302002000200011
Abstract: this article is a provocation. it focuses on the learning society, its substance and rhetoric. protagonists of the learning society advance the idea that schooling is dying, and that education should undergo re-engineering. a new infrastructure is proposed around the concept of on-line learning. this vision of the learning society suffers, however, from at least three defects. first, it assumes that what can be imagined can be delivered; secondly, that making something work is as simple as designing an infrastructure; and finally, that the learning society can escape from the power relations that also marked its predecessors.
Prospects of Forward Energy Flow and Low-x Physics at the LHC
Hamilton, Andrew
High Energy Physics - Phenomenology , 2007,
Abstract: The LHC will soon provide proton-proton collisions at the unprecedented center of mass energy, $\sqrt{s}=$14 TeV. This not only allows us to probe new regions of high-$p_T$ physics, but also low-$x$ and forward physics. A selection of potential measurements are described to outline the prospects for low-$x$ and forward physics in the ATLAS, CMS, TOTEM, and LHCf experiments.
El Padre Bernabé Cobo y las lenguas indígenas de América
Hamilton Roland
Lexis , 1978,
Abstract:
Relinquishing the Practices of a Lifetime: Observations on ageing, caring and literacies
Mary Hamilton
Literacy and Numeracy Studies , 2009,
Abstract: This paper draws on ethnographic and case study data from a variety of sources to explore the changing social practices of literacy across the lifespan. It explores the new literacy demands that people encounter with age when dealing with life events in a range of social domains. These include increased leisure; travel; changing family and peer relationships as a result of death and loss; issues of health and disability and accessing new technologies. It reveals how literacy is implicated in peoples' changing sense of time, place and history; how the older person’s identity as a literate actor may be interrupted by both institutional and informal processes of caring and their disengagement from spheres of activity that were previously central markers of their identity. Ageing thus involves both expansion and retreat from familiar literacy practices.
Telehealth at scale: the case for abandoning the paradigm of the “frequent flyer”
Brian Hamilton
International Journal of Integrated Care , 2012,
Abstract:
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