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Search Results: 1 - 10 of 566910 matches for " María E.;Gorla "
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Life cycle and reproductive patterns of Triatoma rubrovaria (Blanchard, 1843) (Hemiptera: Reduviidae) under constant and fluctuating conditions of temperature and humidity
Damborsky, Miryam P.;Bar, María E.;Gorla, David;
Revista da Sociedade Brasileira de Medicina Tropical , 2005, DOI: 10.1590/S0037-86822005000500014
Abstract: the aim of this study was to evaluate the temperature and relative humidity influence in the life cycle, mortality and fecundity patterns of triatoma rubrovaria. four cohorts with 60 recently laid eggs each were conformed. the cohorts were divided into two groups. in the controlled conditions group insects were maintained in a dark climatic chamber under constant temperature and humidity, whereas triatomines of the ambiental temperature group were maintained at room temperature. average incubation time was 15.6 days in the controlled conditions group and 19.1 days in the ambiental temperature. in group controlled conditions the time from egg to adult development lasted 10 months while group ambiental temperature took four months longer. egg eclosion rate was 99.1% and 98.3% in controlled conditions and ambiental temperature, respectively. total nymphal mortality in controlled conditions was 52.6% whereas in ambiental temperature was 51.8%. mean number of eggs/female was 817.6 controlled conditions and 837.1 ambiental temperature. fluctuating temperature and humidity promoted changes in the life cycle duration and in the reproductive performance of this species, although not in the species mortality.
Life cycle and reproductive patterns of Triatoma rubrovaria (Blanchard, 1843) (Hemiptera: Reduviidae) under constant and fluctuating conditions of temperature and humidity
Damborsky Miryam P.,Bar María E.,Gorla David
Revista da Sociedade Brasileira de Medicina Tropical , 2005,
Abstract: The aim of this study was to evaluate the temperature and relative humidity influence in the life cycle, mortality and fecundity patterns of Triatoma rubrovaria. Four cohorts with 60 recently laid eggs each were conformed. The cohorts were divided into two groups. In the controlled conditions group insects were maintained in a dark climatic chamber under constant temperature and humidity, whereas triatomines of the ambiental temperature group were maintained at room temperature. Average incubation time was 15.6 days in the controlled conditions group and 19.1 days in the ambiental temperature. In group controlled conditions the time from egg to adult development lasted 10 months while group ambiental temperature took four months longer. Egg eclosion rate was 99.1% and 98.3% in controlled conditions and ambiental temperature, respectively. Total nymphal mortality in controlled conditions was 52.6% whereas in ambiental temperature was 51.8%. Mean number of eggs/female was 817.6 controlled conditions and 837.1 ambiental temperature. Fluctuating temperature and humidity promoted changes in the life cycle duration and in the reproductive performance of this species, although not in the species mortality.
El descubrimiento de la ruta terrestre entre Buenos Aires y el Río Negro
Gorla, Carlos María
Anuario de Estudios Americanos , 1995,
Abstract: Not available. A raíz de los grandes malones de I780, Vértiz activó los trabajos destinados a la defensa del territorio, al mismo tiempo que procuró establecer relaciones pacificas con las parcialidades indígenas que merodeaban la frontera bonaerense. La expedición de Zizur tuvo como objeto negociar la paz con el cacique Lorenzo y, a su vez. "inspeccionar la campa a''. Como resultado de esta empresa tuvo lugar un prolijo reconocimiento de la ruta terrestre entre la capital del Virreinato y el Río Negro, la que pudo ser reconstruida mediante el estudio crítico del diario de la expedición, realizado con la información que aporta la documentación édita e inédita, con el auxilio de la cartografía histórica y las mensura de los terrenos por los que tramitara la misma, practicadas a partir del siglo pasado. Como síntesis final, se ha volcado el camino seguido por Zizur en la cartografía actual.
Daily pattern of flight activity of Aedes albifasciatus in Central Argentina
Ludue?a Almeida, Francisco F.;Gorla, David E.;
Memórias do Instituto Oswaldo Cruz , 1995, DOI: 10.1590/S0074-02761995000500020
Abstract: aedes albifasciatus is an important common mosquito in central argentina. its a confirmed vector of the western equine encephalitis and is responsible for loss of milk production in dairy cattle during peak populations. this paper reports the flight activity pattern of ae. albifasciatus for different seasons, in the southern coast of the mar chiquita lake (central argentina). data were collected by sampling two sites between 1992 and 1993 with cdc traps and human-bait captures. adult mosquito population density, estimated by cdc trapping and human-bait, were highly correlated. however, when compared to other species, the proportion of ae. albifasciatus was higher in human-bait collections. adult female populations were active only when temperature were higher than 6§c. two daily biting peaks were observed (dusk and dawn) during the spring, summer and autumn, and only one peak during winter (around 15:00 pm). adult abundance was significantly correlated (r2= 0.71; p<0.01) with temperature and illumination.
The biology of Aedes (Ochlerotatus) albifasciatus Macquart, 1838 (Diptera: Culicidae) in Central Argentina
Ludue?a Almeida, Francisco F.;Gorla, David E.;
Memórias do Instituto Oswaldo Cruz , 1995, DOI: 10.1590/S0074-02761995000400006
Abstract: aedes albifasciatus is a flood water mosquito ocurring in the southern countries of south america. it is a competent vector of the western equine encephalitis (wee) and causes important losses on milk and beef production in central argentina. field work was carried out from december 1990 to march 1993, on a monthly basis during the dry season and biweekly during the rainy season. larvae were collected using the 'dipping' technique and females with cdc traps baited with co2. field collected larvae were used to build laboratory cohorts, from which basic population parameters were estimated. eggs survived up to six months on dry soil, although there was a linear decrease of viability with time. at 23oc, larval development time was around nine days, and all adults emerged within one week. the estimation of larval development in the laboratory seems to be very near the development on the field, as larvae have been collected on average eight days after a rainfall. egg to adult survival was 83%, with the highest mortality on fourth larval instar (6%). in the laboratory studies, sex proportion among the adults was 1:1, females lived longer than males (median 13 and five days, respectively), and adult survival pattern showed a constant number of individuals dying per unit time. field collected females layed an average of 84 eggs per batch, and completing up to five gonotrophic cycles, suggesting an estimated survival of up to 35-50 days.
The general hyperplane section of a curve
E. Gorla
Mathematics , 2003,
Abstract: In this paper, we discuss some necessary and sufficient condition for a curve to be arithmetically Cohen-Macaulay, in terms of its general hyperplane section. We obtain a characterization of the degree matrices that can occur for points in the plane that are the general hyperplane section of a non arithmetically Cohen-Macaulay curve of P^3. We prove that almost all the degree matrices with positive subdiagonal that occur for the general plane section of a non arithmetically Cohen-Macaulay curve of P^3, arise also as degree matrices of the general plane section of some smooth, integral, non arithmetically Cohen-Macaulay curve, and we characterize the exceptions. We give a necessary condition on the graded Betti numbers of the general hyperplane section of an arithmetically Buchsbaum, (non arithmetically Cohen-Macaulay) curve in P^n. For curves in P^3, we show that any set of Betti numbers that satisfies that condition, can be realised as the Betti numbers of the general plane section of an arithmetically Buchsbaum, non arithmetically Cohen-Macaulay curve. We also show that the matrices that arise as degree matrix of the general plane section of an arithmetically Buchsbaum, integral, (smooth) non arithmetically Cohen-Macaulay space curve are exactly those that arise as degree matrix of the general plane section of an arithmetically Buchsbaum, non arithmetically Cohen-Macaulay space curve and have positive subdiagonal. We also prove some bounds on the dimension of the deficiency module of an arithmetically Buchsbaum space curve, in terms of the degree matrix of the general plane section of the curve.
Potential sources of Triatoma infestans reinfesting peridomiciles identified by morphological characterization in Los Llanos, La Rioja, Argentina
Hernández, María Laura;Dujardin, Jean Pierre;Gorla, David Eladio;Catalá, Silvia Susana;
Memórias do Instituto Oswaldo Cruz , 2013, DOI: 10.1590/S0074-02762013000100015
Abstract: the presence of triatoma infestans in habitats treated with insecticides constitutes a frequent problem in endemic areas. basing our study on the hypothesis that descendants of a residual population should be more similar to the pre-treatment population than to any other, we compared the indications of two quantitative morphological approaches. this study seeks to find the origin of 247 t. infestans from three populations found in two chicken coops and a goat corral after treatment with insecticides. the results obtained by quantitative morphology suggest that the t. infestans found between three-34 months after the application of insecticides formed mixed populations with insects derived from residual foci and neighbouring habitats. our analyses also showed the presence of a phenotype which does not resemble neither the pre-treatment phenotype nor the one from neighbouring populations, suggesting the presence of a particular post-treatment phenotype. the heads size showed some variations in males from different populations and remained unchanged in females, which reinforces the hypothesis of an intraspecific competition for food with priority for females. this article presents, for the first time, the combined analysis of geometric morphometry of heads and antennal phenotypes to identify the composition of reinfesting populations.
Uso del Fingerprinting de ADN para asignar paternidad en un reba?o con casos de malformación congénita de la pared abdominal
GORLA,N.; BENAVIDES,F.; SALAVERRI,M.; LUDUE?A,R.; GRANDOLI,N.; CORLEY,E.; LARRIPA,I.;
Archivos de medicina veterinaria , 1998, DOI: 10.4067/S0301-732X1998000200016
Abstract: the efficiency of dna fingerprinting to solve a paternity dispute wasevaluated in four hereford bulls of a cebú/hereford cattle herdwith two calves affected by a congenital abdominal wall malformation. thetest was carried out using multi-locus probe (cac)5. 8 dna samples ?twofrom the affected calves, two from their corresponding mothers and 4 frombulls (supposed sires)? were processed. these samples were digested withrestriction enzyme hae iii, blotted onto nylon membranes and hybridisedwith (cac)5. the bands obtained were visually analysed and data was processedby the computer program "pater" (with the "pater" computer program). theprobability of paternity (w) was w = 0.80 in one case and w = 0.93 in theother. despite the known inbreeding of the bovine breed tested, it waspossible to ascertain the paternity with multilocus dna fingerprinting(cac)5
Variables ambientales registradas por sensores remotos como indicadores de la distribución geográfica de Triatoma infestans (Heteroptera: Reduviidae)
Gorla,David E;
Ecolog?-a austral , 2002,
Abstract: the paper presents an analysis of the geographic distribution of triatoma infestans based on biophysical variables recorded by meteorological satellites. the analysis includes data derived from a temporal fourier analysis of monthly images over a set of 14 derived statistical descriptors of the average, minimum, maximum, variability, amplitude and phase of the air temperature, land surface temperature, medium infrared radiation and a vegetation index remotely sensed by the avhrr. temporal series covered the period 1982-2000, and the area from panamá to tierra del fuego. the analysis of individual variables showed that the annual phase of the normalised difference vegetation index identifies correctly 80% presence and absence sites of triatoma infestans. the analysis confirms the importance of temperature (especially air temperature) for triatoma infestans distribution, as 7 (out of 14) statistical descriptors associated with air temperature identified correctly >70% of presence and absence sites. a stepwise linear discriminant analysis showed that a function with six statistical descriptors (four of them associated with air temperature, one associated with medium infrared radiation, and one with the vegetation index) identified correctly 90% of presence and absence sites of triatoma infestans. the analysis shows the important association between the environmental variables studied at the continental scale and the distribution of a strictly domestic and haematophagous species. the approach could be useful for large scale studies of the distribution of other species with more direct and causal relation with vegetation and climate than triatoma infestans.
Utilización de variables citogenéticas y antropométricas para un eficiente manejo de primates neotropicales en cautiverio
Ferre,D; Steinberg,E. R; Albarracín,L; Pedrosa,A; Hynes,V; Duarte,A; Mudry,M. D; Gorla,N;
InVet , 2009,
Abstract: the neotropical primates which are part of the collection of the mendoza zoological garden (zma) were object of a collaborative study that included the performance of anthropometrical measurements and classic cytogenetic analysis (alpha). thirteen specimens of the genus alouatta (10 females and 3 males), 2 cebus sp. (1 male and 1 female) and 3 females of saimiri sp. were studied. the karyological study allowed to confirm that the cebus of zma corresponded to cebus paraguayanus (2n=54, xx/xy) and the saimiri to saimiri boliviensis boliviensis species (2n = 44, xx). in the howler monkeys the species assignment was confirmed to a. caraya and a chromosomal morphology in the mitotic metaphases, compatible with the previously described and confirmed by meiosis, multiple sex determination system x1x1x2x2/x1x2y1y2, was observed. this opportunity allowed the zma to implementthe identification through the injection of numerated microchips that will facilitate its following and management.
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