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Search Results: 1 - 10 of 379501 matches for " Carla L;Arcos-Terán "
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Absence of domestic triatomine colonies in an area of the coastal region of Ecuador where Chagas disease is endemic
Grijalva, Mario J;Palomeque, Francisco S;Villacís, Anita G;Black, Carla L;Arcos-Terán, Laura;
Memórias do Instituto Oswaldo Cruz , 2010, DOI: 10.1590/S0074-02762010000500013
Abstract: rhodnius ecuadoriensis is considered the second most important vector of chagas disease in ecuador. it is distributed across six of the 24 provinces and occupies intradomiciliary, peridomiciliary and sylvatic habitats. this study was conducted in six communities within the coastal province of guayas. triatomine searches were conducted in domestic and peridomestic habitats and bird nests using manual searches, live-bait traps and sensor boxes. synantrhopic mammals were captured in the domestic and peridomestic habitats. household searches (n = 429) and randomly placed sensor boxes (n = 360) produced no live triatomine adults or nymphs. in contrast, eight nymphs were found in two out of six searched campylorhynchus fasciatus (troglodytidae) nests. finally, trypanosoma cruzi dna was amplified from the blood of 10% of the 115 examined mammals. environmental changes in land use (intensive rice farming), mosquito control interventions and lack of intradomestic adaptation are suggested among the possible reasons for the lack of domestic triatomine colonies.
Life cycle, feeding and defecation patterns of Rhodnius ecuadoriensis (Lent & León 1958) (Hemiptera: Reduviidae: Triatominae) under laboratory conditions
Villacís, Anita G;Arcos-Terán, Laura;Grijalva, Mario J;
Memórias do Instituto Oswaldo Cruz , 2008, DOI: 10.1590/S0074-02762008000700011
Abstract: rhodnius ecuadoriensis is the second most important vector of chagas disease (cd) in ecuador. the objective of this study was to describe (and compare) the life cycle, the feeding and defecation patterns under laboratory conditions of two populations of this specie [from the provinces of manabí (coastal region) and loja (andean region)]. egg-to-adult (n = 57) development took an average of 189.9 ± 20 (manabí) and 181.3 ± 6.4 days (loja). mortality rates were high among lojan nymphs. pre-feeding time (from contact with host to feeding initiation) ranged from 4 min 42 s [nymph i (ni)] to 8 min 30 s (male); feeding time ranged from 14 min 45 s (ni)-28 min 25 s (male) (manabí) and from 15 min 25 s (ni)-28 min 57 s (nymph v) (loja). the amount of blood ingested increased significantly with instar and was larger for manabí specimens (p < 0.001). defecation while feeding was observed in manabí specimens from stage nymph iii and in lojan bugs from stage nymph iv. there was a gradual, age-related increase in the frequency of this behaviour in both populations. our results suggest that r. ecuadoriensis has the bionomic traits of an efficient vector of trypanosoma cruzi. together with previous data on the capacity of this species to infest rural households, these results indicate that control of synanthropic r. ecuadoriensis populations in the coastal and andean regions may have a significant impact for cd control in ecuador and northern peru.
Fe de erratas
Ana Celina Terán Rosero,Carla Cristina Botero álvarez,Angélica María López Velásquez,Francisco Eladio Restrepo Escobar
Cuadernos de Administración (Universidad del Valle) , 2012,
Cartas al editor
Ana Celina Terán Rosero,Carla Cristina Botero álvarez,Angélica María López Velásquez,Francisco Eladio Restrepo Escobar
Cuadernos de Administración (Universidad del Valle) , 2012,
Spin dependent structure function $ g_{2}(x)$ in quark-parton model. Possible interpretation and numerical estimates
N. L. Ter-Isaakyan
Physics , 1994,
Abstract: It is shown that in the special infinite momentum frame where photon has pure transverse components at $P\rightarrow\infty$ the spin-dependent deep inelastic structure function $ g_{2}(x)$ has a reasonable interpretation in terms of quark-parton wave functions, whereas in the conventional frame where photon has pure z-component the parton model fails for $ g_{2}(x)$.The spin dependent structure functions $ g_{1}(x)$ and $ g_{2}(x)$ have been calculated in the relativistic quark model constructed in such frame. The results indicate significant twist-3 contribution.
On Deuteron Spin Dependent Structure Function $ g_{2}(x)$ in Relativistic Model of Deuteron
N. L. Ter-Isaakyan
Physics , 1995, DOI: 10.1016/0370-2693(96)00627-2
Abstract: The spin dependent deuteron structure functions are investigated in the relativistic model of deuteron. It is shown that the deuteron structure function $g_{2}(X)$ can be considered properly only in the infinite momentum frame where the virtual photon has pure transverse components ($q_{0}=-q_{3}\rightarrow 0$ at $ P\rightarrow \infty $), whereas in the conventional Breit frame the impulse approximation for $g_{2}(X)$ may be violated due to $q\bar{q}$ pair creation by the virtual photon. It is shown that due to relativistic effects the deuteron structure function $g_{2}(X)$ has a nontrivial contribution determined by first derivative of the nucleon structure function $g_{1}(x)$. Such contribution is small but it increases when $X \rightarrow 1$. It may achieve about 10 \% at $ X \sim 0.75$ and could be essentially larger for the transverse structure function $g_{\perp}(X).$
A Multiparameter Colloidal Titrations for the Determination of Cationic Polyelectrolytes  [PDF]
Eduardo A. López Maldonado, Adrián O. Terán, Mercedes T. O. Guzmán
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.311172
Abstract: In water treatment processes and conditioning drinking water, PEs are widely used; however, their environmental impact is still doubtful, since residual concentrations increase organic matter content and represents a potential health hazard. This paper demonstrates a multiparametric study of two colloidal titration methods: spectrophotometric and zeta potential end point detection. The first one was optimized to guarantee the accuracy of cationic commercial PE quantification. It includes the indicator dose optimization using analytical criteria for competing equilibria, a calibration curve for two ranges of CPE concentration (1 - 5 ppm and 5 - 100 ppm) and the interference study of flocculant and Sn in the CPE quantification. The second method provides a physicochemical validation of the electric surface phenomena occurring during the colloidal titration and the end point detection. As an additional contribution the zeta potential titration was discussed and proposed as an alternative method for quantifying CPE when the sample is metal free.
Evaluation of the Physicochemical Behavior of Waste Water Treatment Polyelectrolytes with Metal Ions  [PDF]
Eduardo A. López Maldonado, Mercedes T. Oropeza Guzmán, Georgina Pina-Luis, Adrián Ochoa-Terán
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.43032
Abstract: In this paper is describing the physicochemical behavior of polyelectrolytes (PEs) used in waste water treatment with mono-, di- and trivalent metal ions as K+, Mg2+, Zn2+, Fe3+, Sn2+, Cd2+, Pb2+, Cu2+, Ni2+, Al3+ and Cr3+. A coagulant polyelectrolyte Poly(vinyl sulfate) potassium salt (PVSK), and a commercial available Flocculant Trident 2756, were used as models for the study. The colloidal titration UV-Vis spectroscopy technique was successfully implemented in order to evaluate the complexation of PEs with Toluidine Blue O (OTB) and the ability of different metal ions to displace the OTB from the PE-OTB complex and form the PE-metal ion complex. From the experiments was concluded that PVSK has a high affinity for Al3+ and Mg2+ while the
Complicaciones Macrovasculares en Diabetes Tipo 2 Asociación con Factores de Riesgo
F Contreras,N Barreto,S Jiménez,L Terán
Archivos Venezolanos de Farmacología y Terapéutica , 2000,
Abstract: Con el objeto de determinar la incidencia de complicaciones macrovasculares en sujetos diabéticos tipo 2 en la ciudad de los Teques, se seleccionaron 40 pacientes que acuden a la consulta de diabetes del HVSR entre Febrero y Noviembre de 1998, con diagnóstico de diabetes tipo 2 y 30 pacientes con características semejantes, sanas. Se dise o un estudio de tipo descriptivo transversal. A tal fin se realizó historia clínica detallada que incluía la presencia de factores de riesgo cardiovascular (HTA, dislipemias, hábito tabáquico, consumo de alcohol, tratamiento dietético y/o farmacológico). Seguidamente se determinaron parámetros antropométricos, perfil lipídico, glicemia basal y hemoglobina glicosilada. Entre los principales resultados cabe se alar diferencias significativas entre el grupo experimental y el grupo control en cuanto a IMC; relación C/C, glicemia en ayunas y hemoglobina glicosilada. En el grupo experimental, además, destacan: edad 48±8.05 a os (x±DE) siendo su distribución por sexo del 45% varones y 55% mujeres. El tiempo de evolución de la diabetes desde su diagnóstico fue de 10,4 ± 8,3 a os. Se evidenció un consumo de alcohol de 15% en total y 10% de hábito tabáquico. El valor promedio, de glicemia basal 160,40±40,6 mg/dL con HbA1c de 7,4±1,2%. La hipertensión arterial estuvo presente en 60% de los pacientes. 70% presentaban dislipemia según los criterios de la Asociación Venezolana de Aterosclerosis (SVA). El IMC resultó elevado en 78% de los casos con un rango de 31,4±4,2. Se detectó hiperfibrinogenemia de 380±50 mg/dL; el 35,4% de los pacientes presentaba complicaciones macrovasculares al momento de su evaluación siendo la más frecuente la enfermedad vascular periférica en 25% de los casos. Todos estos resultados enfatizan la necesidad de realizar un enfoque integral del paciente diabético que permita no solo un control adecuado de la glicemia sino también un correcto tratamiento de los principales factores de riesgo asociados a complicaciones macrovasculares. In order to determine the incidence of gross vascular complications in adults with Diabetes Mellitus Type 2, was designed a descriptive transversal study. We selected 40 patients with diagnosis of Diabetes Mellitus type 2, attending the Outpatient Diabetic Clinic at the Victorino Santaella Ruiz Hospital in Los Teques, Venezuela and 30 healthy subjects with similar characteristics as group control, from February to November 1998. The patient’s age ranged from 30 to 75 years, all with more than five years since their first diagnosis of Diabetes Type 2 and complying with the inclusio
Experiences and Conclusions of the Hungarian Emergency Sepsis Register  [PDF]
ter Kanizsai, Tamás Berényi, Miklós Pálv?lgyi, János Gál, Zoltán Pet?
Open Journal of Epidemiology (OJEpi) , 2017, DOI: 10.4236/ojepi.2017.71005
Abstract: Objective: Early recognition is a key step in decreasing morbidity and mortality in sepsis. Like in other European countries an ever growing number of septic patients enter hospitals via emergency departments. Our goal was to assess the number and severity of patients with sepsis, severe sepsis and septic shock attending the Hungarian emergency departments. Methods: Two-hundred and ninety-nine patients were entered into the Hungarian Emergency Sepsis Register, focusing on age, disease severity, monitoring and oxygenation. Application and time of administration of antibiotics, use of biomarkers, i.e. lactate and procalcitonin, disposition of patients were assessed using a web-based electronic questionnaire. Results: Data arriving from twenty emergency departments revealed that with severity of the disease oxygen administration and level of monitoring increased, along with antibiotic administration and use of biomarkers. Time spent in the ED did not differ between septic, severely septic and septic shock patients; however higher level of care was provided for the sickest patients. Conclusion: Our register data indicate that sepsis presents a substantial challenge to Hungarian emergency departments. The set standards for timely, adequate treatment are not yet met. The results are however also influenced by characteristics of the Hungarian health care system, most notably the lack of hospice systems. Further studies are needed to separate the subset of patients who would require and of life care.
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