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Search Results: 1 - 10 of 1833 matches for " Ramsey JM "
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Control of Chagas disease vectors
Ramsey,JM; Schofield,CJ;
Salud Pública de México , 2003, DOI: 10.1590/S0036-36342003000200010
Abstract: most latin american countries are making dramatic progress in controlling chagas disease, through a series of national and international initiatives focusing on elimination of domestic populations of triatominae, improved screening of blood donors, and clinical support and treatment of persons infected with trypanosoma cruzi. some countries, particularly uruguay, chile and brazil, are sufficiently advanced in their programmes to initiate detailed planning of the subsequent phases of chagas disease control, while others such as peru, ecuador, and mexico, are currently applying only the initial phases of the control campaigns. in this review, we seek to provide a brief history of the campaigns as a basis for discussion of future interventions. our aim is to relate operational needs to the underlying biological aspects that have made chagas disease so serious in latin america but have also revealed the epidemiological vulnerability of this disease.
Control of Chagas disease vectors
Ramsey JM,Schofield CJ
Salud Pública de México , 2003,
Abstract: Most Latin American countries are making dramatic progress in controlling Chagas disease, through a series of national and international initiatives focusing on elimination of domestic populations of Triatominae, improved screening of blood donors, and clinical support and treatment of persons infected with Trypanosoma cruzi. Some countries, particularly Uruguay, Chile and Brazil, are sufficiently advanced in their programmes to initiate detailed planning of the subsequent phases of Chagas disease control, while others such as Peru, Ecuador, and Mexico, are currently applying only the initial phases of the control campaigns. In this review, we seek to provide a brief history of the campaigns as a basis for discussion of future interventions. Our aim is to relate operational needs to the underlying biological aspects that have made Chagas disease so serious in Latin America but have also revealed the epidemiological vulnerability of this disease.
Nuclear rDNA-based molecular clock of the evolution of triatominae (Hemiptera: Reduviidae), vectors of Chagas disease
Bargues MD,Marcilla A,Ramsey JM,Dujardin JP
Memórias do Instituto Oswaldo Cruz , 2000,
Abstract: The evolutionary history and times of divergence of triatomine bug lineages are estimated from molecular clocks inferred from nucleotide sequences of the small subunit SSU (18S) and the second internal transcribed spacer (ITS-2) of the nuclear ribosomal DNA of these reduviids. The 18S rDNA molecular clock rate in Triatominae, and Prosorrhynchan Hemiptera in general, appears to be of 1.8% per 100 million years (my). The ITS-2 molecular clock rate in Triatominae is estimated to be around 0.4-1% per 1 my, indicating that ITS-2 evolves 23-55 times faster than 18S rDNA. Inferred chronological data about the evolution of Triatominae fit well with current hypotheses on their evolutionary histories, but suggest reconsideration of the current taxonomy of North American species complexes.
Nuclear rDNA-based molecular clock of the evolution of triatominae (Hemiptera: Reduviidae), vectors of Chagas disease
Bargues, MD;Marcilla, A;Ramsey, JM;Dujardin, JP;Schofield, CJ;Mas-Coma, S;
Memórias do Instituto Oswaldo Cruz , 2000, DOI: 10.1590/S0074-02762000000400020
Abstract: the evolutionary history and times of divergence of triatomine bug lineages are estimated from molecular clocks inferred from nucleotide sequences of the small subunit ssu (18s) and the second internal transcribed spacer (its-2) of the nuclear ribosomal dna of these reduviids. the 18s rdna molecular clock rate in triatominae, and prosorrhynchan hemiptera in general, appears to be of 1.8% per 100 million years (my). the its-2 molecular clock rate in triatominae is estimated to be around 0.4-1% per 1 my, indicating that its-2 evolves 23-55 times faster than 18s rdna. inferred chronological data about the evolution of triatominae fit well with current hypotheses on their evolutionary histories, but suggest reconsideration of the current taxonomy of north american species complexes.
Morphometric analysis of Triatoma dimidiata populations (Reduviidae:Triatominae) from Mexico and Northern Guatemala
Lehmann, P;Ordo?ez, R;Ojeda-Baranda, R;Lira, J Mendez de;Hidalgo-Sosa, L;Monroy, C;Ramsey, JM;
Memórias do Instituto Oswaldo Cruz , 2005, DOI: 10.1590/S0074-02762005000500006
Abstract: triatoma dimidiata is one of the major vectors of chagas disease in latin america. its range includes mexico, all countries of central america, colombia, and ecuador. in light of recent genetic analysis suggesting that the possible origin of this species is the yucatan peninsula, we have analyzed populations from the state of yucatan, san luis potosi, and veracruz in mexico, and a population from the southern region of the yucatan peninsula located in northern guatemala, the region of el peten. classical morphometry including principal component, discriminant, sexual dimorphism, and wing asymmetry was analyzed. san luis potosi and veracruz populations were indistinguishable while clearly separate from yucatan and peten populations. despite important genetic differences, yucatan and peten populations were highly similar. yucatan specimens were the smallest in size, while females were larger than males in all populations. only head characters were necessary to distinguish population level differences, although wing fluctuating asymmetry was present in all populations. these results are discussed in light of recent findings suggesting genetic polymorphism in most populations of triatoma dimidiata south of chiapas to ecuador.
To Sten
David Ramsey
Voices: A World Forum for Music Therapy , 2013,
Abstract:
$B_{\mathrm{Sen}}$ via distributions on weight space
Nick Ramsey
Mathematics , 2009,
Abstract: We introduce a certain ring of rigid-analytic distributions on $p$-adic weight space (modulo torsion) and show that it is canonically isomorphic to Colmez's ring $B_{\mathrm{Sen}}$.
Geometric and $p$-adic modular forms of half-integral weight
Nick Ramsey
Mathematics , 2009,
Abstract: We introduce a geometric formalism for studying modular forms of half-integral weight and explore some of its basic properties. Geometric Hecke operators are constructed and some basic spaces of $p$-adic forms are introduced. The $p$-adic theory is greatly expanded in subsequent papers, making that part of this paper largely obsolete.
The overconvergent Shimura lifting
Nick Ramsey
Mathematics , 2009,
Abstract: We construct a rigid-analytic map from the the author's half-integral weight cuspidal eigencurve to its integral weight counterpart that interpolates the classical Shimura lifting.
The half-integral weight eigencurve
Nick Ramsey
Mathematics , 2009,
Abstract: In this paper we define Banach spaces of overconvergent half-integral weight $p$-adic modular forms and Banach modules of families of overconvergent half-integral weight $p$-adic modular forms over admissible open subsets of weight space. Both spaces are equipped with a continuous Hecke action for which $U_{p^2}$ is moreover compact. The modules of families of forms are used to construct an eigencurve parameterizing all finite-slope systems of eigenvalues of Hecke operators acting on these spaces. We also prove an analog of Coleman's theorem stating that overconvergent eigenforms of suitably low slope are classical.
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