Programa basado en teoría de Polya para mejorar la matemática básica, Universidad Privada del Norte

El presente trabajo tiene como objetivo demostrar en qué medida el programa Basado en la Teoría de Polya mejora el rendimiento académico en el curso de Matemática Básica en los estudiantes de la Universidad Privada del Norte, Trujillo 2017-2. Se desarrolló una investigación de tipo aplicada y diseño cuasi experimental, la población estuvo constituida por 10 aulas de 40 estudiantes, de las 10 aulas se escogió a 2 aulas; grupo de control (3110) y grupo experimental (4143), se realizó un examen pre test a los dos grupos, el cual midió el nivel de conocimiento de los estudiantes en ese momento, para luego aplicar un post test teniendo en cuenta que en el grupo experimental se aplicó el Programa Basado en la Teoría de Polya, mientras que en el grupo control se aplicó el método de enseñanza tradicional. Se observó que en el grupo experimental el número de estudiantes aprobados es del 70% (distribuidos en los niveles regular, bueno y muy bueno) mientras que el grupo control el número de estudiantes aprobados es del 55% (distribuido en los niveles regular, bueno y muy bueno). Estos resultados demuestran que el Programa Basado en la Teoría de Polya mejora significativamente el rendimiento académico en el curso de Matemática Básica de los estudiantes de la Universidad Privada del Norte, Trujillo 2017-2, con relación a la metodología tradicional.Tesi

COVID-19 exposes weaknesses in public health in the Peruvian Amazon and highlights opportunities for a One Health approach

The Amazon is home to important wildlife and a biodiversity hotspot of global importance. The ancestral knowledge kept by Indigenous communities about its fauna and flora contributes further to its irreplaceable value. The Peruvian Amazon was heavily struck by the COVID-19 epidemic with a cumulative incidence of 725, a mortality rate of 34 per 100,000 inhabitants, and a case fatality rate of 4.6% by the end of July 2020. In this work, we review scientific literature and media to trace the events that happened at the beginning of the COVID-19 epidemic in the Peruvian Amazon. Results are synthesized in three observations: (1) the evolution of the COVID-19 epidemic within the Peruvian Amazon and the response of the Peruvian health care system, (2) Confusing information about Ivermectin use for COVID-19 treatment and prevalent self-medication (3) The response of the traditional Indigenous health care system to the COVID-19 epidemic. These three observations are interdependent. There is an unexploited potential for integrative approaches linking traditional medical practices (TMP) and biomedical approaches and they may benefit from the interactions that occur between them. Synergies can also be explored between the human and animal health care sector, especially in terms of the use and stewardship of medicines. We conclude that there is a benefit of the One Health approach in the region, which can go through the common ambition to improve the integrated health of people, animals and ecosystems, facilitate the enhancement of equity and inclusion while improving access to health services and conserving biodiversity. One Health Impact Statement The Amazon region is home to wildlife flora and fauna and indigenous Amazon communities. The case presented in this work shows that an existing grassroots initiative has been reducing case fatality rates tenfold during the COVID-19 epidemic, while acting in respect towards nature and the environment, and using its resources. This is in stark contrast to the uncontrolled, ineffective self-medication with ivermectin in that same period, which may endanger the biodiversity hotspot through metabolic residues. While the current example seems to illustrate community resilience due to government negligence, it also shows the vastly unexplored potential of integrating biomedical and traditional indigenous knowledge in a solidaric and co-creative framework such as One Health

Genetic diversity and population structure of genes encoding vaccine candidate antigens of Plasmodium vivax

<p>Abstract</p> <p>Background</p> <p>A major concern in malaria vaccine development is genetic polymorphisms typically observed among <it>Plasmodium </it>isolates in different geographical areas across the world. Highly polymorphic regions have been observed in <it>Plasmodium falciparum </it>and <it>Plasmodium vivax </it>antigenic surface proteins such as Circumsporozoite protein (CSP), Duffy-binding protein (DBP), Merozoite surface protein-1 (MSP-1), Apical membrane antigen-1 (AMA-1) and Thrombospondin related anonymous protein (TRAP).</p> <p>Methods</p> <p>Genetic variability was assessed in important polymorphic regions of various vaccine candidate antigens in <it>P. vivax </it>among 106 isolates from the Amazon Region of Loreto, Peru. In addition, genetic diversity determined in Peruvian isolates was compared to population studies from various geographical locations worldwide.</p> <p>Results</p> <p>The structured diversity found in <it>P. vivax </it>populations did not show a geographic pattern and haplotypes from all gene candidates were distributed worldwide. In addition, evidence of balancing selection was found in polymorphic regions of the <it>trap, dbp </it>and <it>ama-1 </it>genes.</p> <p>Conclusions</p> <p>It is important to have a good representation of the haplotypes circulating worldwide when implementing a vaccine, regardless of the geographic region of deployment since selective pressure plays an important role in structuring antigen diversity.</p

Frecuencia elevada de casos de dengue grave durante la epidemia por el linaje II del DENV-2 americano/asiático en el Perú

Introduction. The entry of American/Asian DENV-2 lineage II in the Loreto region of the Peruvian Amazon coincided with a sudden increase in dengue cases requiring hospitalization. However, official statistics reported few severe cases. It is postulated that there was an underreporting of severe cases in the official reports of the Ministry of Health. Objectives. To determine the frequency of patients with signs of severity among patients hospitalized for probable dengue fever during the 2011 outbreak at the Iquitos Hospital, Peru. Methods. A longitudinal study was carried out applying a daily checklist on the presence of signs of severity during hospital stay to a group of patients hospitalized in the dengue unit of the Iquitos hospital. Results. Of 178 patients evaluated, 66 (37%, CI: 29.9- 44.6%) presented some sign of severity, mostly due to shock (75,7%). This result contrasts with the number of patients with severe dengue reported by the Ministry of Health during 2011 in the Loreto region. Conclusion. Approximately one third of the patients who were hospitalized with a diagnosis of dengue during the outbreak of American/Asian DENV-2 lineage II developed signs of severity during their hospitalization.Introducción. El ingreso del linaje II del DENV-2 americano/asiático en la región Loreto de la Amazonia Peruana, coincidió con un incremento súbito de los casos de dengue con necesidad de hospitalización. Sin embargo, las estadísticas oficiales reportaron pocos casos graves. Se postula, que existió una subnotificación de los casos graves en los reportes oficiales del Ministerio de Salud. Objetivos. Conocer la frecuencia de pacientes con signos de gravedad entre los pacientes hospitalizados por dengue probable durante el brote del 2011 en el Hospital Iquitos, Perú. Métodos. Se realizó un estudio longitudinal, aplicando una lista de chequeo diaria, sobre la presencia de signos de gravedad durante la estancia hospitalaria, a un grupo de pacientes hospitalizados en la unidad de dengue del Hospital Iquitos. Resultados. De 178 pacientes evaluados 66 (37%, IC: 29,9 – 44,6%) presentaron algún signo de gravedad, la mayor parte por shock (75,7%). Este resultado contrasta con el número de pacientes con dengue grave reportado por el Ministerio de Salud durante el año 2011 en la región Loreto. Conclusión- Aproximadamente un tercio de los pacientes que fueron hospitalizados con el diagnostico de dengue, durante el brote por el linaje II del DENV-2 americano/asiático, desarrollaron signos de gravedad durante su hospitalización

Failure of Supervised Chloroquine and Primaquine Regimen for the Treatment of Plasmodium vivax in the Peruvian Amazon

The widespread use of primaquine (PQ) and chloroquine (CQ), together, may be responsible for the relatively few, isolated cases of chloroquine-resistant P. vivax (CQRPV) that have been reported from South America. We report here a case of P. vivax from the Amazon Basin of Peru that recurred against normally therapeutic blood levels of CQ. Four out of 540 patients treated with combination CQ and PQ had a symptomatic recurrence of P. vivax parasitemia within 35 days of treatment initiation, possibly indicating CQ failure. Whole blood total CQ level for one of these four subjects was 95 ng/ml on the day of recurrence. Based on published criteria that delineate CQRPV as a P. vivax parasitemia, either recrudescence or relapse, that appears against CQ blood levels >100 ng/mL, we document the occurrence of a P. vivax strain in Peru that had unusually high tolerance to the synergistic combination therapy of CQ + PQ that normally works quite well

Selective Whole-Genome Amplification Is a Robust Method That Enables Scalable Whole-Genome Sequencing of Plasmodium vivax from Unprocessed Clinical Samples.

Whole-genome sequencing (WGS) of microbial pathogens from clinical samples is a highly sensitive tool used to gain a deeper understanding of the biology, epidemiology, and drug resistance mechanisms of many infections. However, WGS of organisms which exhibit low densities in their hosts is challenging due to high levels of host genomic DNA (gDNA), which leads to very low coverage of the microbial genome. WGS of Plasmodium vivax, the most widely distributed form of malaria, is especially difficult because of low parasite densities and the lack of an ex vivo culture system. Current techniques used to enrich P. vivax DNA from clinical samples require significant resources or are not consistently effective. Here, we demonstrate that selective whole-genome amplification (SWGA) can enrich P. vivax gDNA from unprocessed human blood samples and dried blood spots for high-quality WGS, allowing genetic characterization of isolates that would otherwise have been prohibitively expensive or impossible to sequence. We achieved an average genome coverage of 24×, with up to 95% of the P. vivax core genome covered by ≥5 reads. The single-nucleotide polymorphism (SNP) characteristics and drug resistance mutations seen were consistent with those of other P. vivax sequences from a similar region in Peru, demonstrating that SWGA produces high-quality sequences for downstream analysis. SWGA is a robust tool that will enable efficient, cost-effective WGS of P. vivax isolates from clinical samples that can be applied to other neglected microbial pathogens. IMPORTANCE: Malaria is a disease caused by Plasmodium parasites that caused 214 million symptomatic cases and 438,000 deaths in 2015. Plasmodium vivax is the most widely distributed species, causing the majority of malaria infections outside sub-Saharan Africa. Whole-genome sequencing (WGS) of Plasmodium parasites from clinical samples has revealed important insights into the epidemiology and mechanisms of drug resistance of malaria. However, WGS of P. vivax is challenging due to low parasite levels in humans and the lack of a routine system to culture the parasites. Selective whole-genome amplification (SWGA) preferentially amplifies the genomes of pathogens from mixtures of target and host gDNA. Here, we demonstrate that SWGA is a simple, robust method that can be used to enrich P. vivax genomic DNA (gDNA) from unprocessed human blood samples and dried blood spots for cost-effective, high-quality WGS

A hitchhiker's guide to myeloid cell subsets: practical implementation of a novel mononuclear phagocyte classification system

The classification of mononuclear phagocytes as either dendritic cells or macrophages has been mainly based on morphology, the expression of surface markers, and assumed functional specialization. We have recently proposed a novel classification system of mononuclear phagocytes based on their ontogeny. Here, we discuss the practical application of such a classification system through a number of prototypical examples we have encountered while hitchhiking from one subset to another, across species and between steady-state and inflammatory settings. Finally, we discuss the advantages and drawbacks of such a classification system and propose a number of improvements to move from theoretical concepts to concrete guidelines

Malaria and other vector-borne infection surveillance in the U.S. Department of Defense Armed Forces Health Surveillance Center-Global Emerging Infections Surveillance program: review of 2009 accomplishments

Vector-borne infections (VBI) are defined as infectious diseases transmitted by the bite or mechanical transfer of arthropod vectors. They constitute a significant proportion of the global infectious disease burden. United States (U.S.) Department of Defense (DoD) personnel are especially vulnerable to VBIs due to occupational contact with arthropod vectors, immunological naiveté to previously unencountered pathogens, and limited diagnostic and treatment options available in the austere and unstable environments sometimes associated with military operations. In addition to the risk uniquely encountered by military populations, other factors have driven the worldwide emergence of VBIs. Unprecedented levels of global travel, tourism and trade, and blurred lines of demarcation between zoonotic VBI reservoirs and human populations increase vector exposure. Urban growth in previously undeveloped regions and perturbations in global weather patterns also contribute to the rise of VBIs. The Armed Forces Health Surveillance Center-Global Emerging Infections Surveillance and Response System (AFHSC-GEIS) and its partners at DoD overseas laboratories form a network to better characterize the nature, emergence and growth of VBIs globally. In 2009 the network tested 19,730 specimens from 25 sites for Plasmodium species and malaria drug resistance phenotypes and nearly another 10,000 samples to determine the etiologies of non-Plasmodium species VBIs from regions spanning from Oceania to Africa, South America, and northeast, south and Southeast Asia. This review describes recent VBI-related epidemiological studies conducted by AFHSC-GEIS partner laboratories within the OCONUS DoD laboratory network emphasizing their impact on human populations

The ANTARES Optical Beacon System

ANTARES is a neutrino telescope being deployed in the Mediterranean Sea. It consists of a three dimensional array of photomultiplier tubes that can detect the Cherenkov light induced by charged particles produced in the interactions of neutrinos with the surrounding medium. High angular resolution can be achieved, in particular when a muon is produced, provided that the Cherenkov photons are detected with sufficient timing precision. Considerations of the intrinsic time uncertainties stemming from the transit time spread in the photomultiplier tubes and the mechanism of transmission of light in sea water lead to the conclusion that a relative time accuracy of the order of 0.5 ns is desirable. Accordingly, different time calibration systems have been developed for the ANTARES telescope. In this article, a system based on Optical Beacons, a set of external and well-controlled pulsed light sources located throughout the detector, is described. This calibration system takes into account the optical properties of sea water, which is used as the detection volume of the ANTARES telescope. The design, tests, construction and first results of the two types of beacons, LED and laser-based, are presented.Comment: 21 pages, 18 figures, submitted to Nucl. Instr. and Meth. Phys. Res.

Head Start Immunity: Characterising the early protection of C strain vaccine against subsequent classical swine fever virus infection

Classical Swine Fever Virus (CSFV) is an ongoing threat to the pig industry due to its high transmission and mortality rates associated with infection. Live attenuated vaccines such as the CSFV C strain vaccine are capable of protecting against infection within 5 days of vaccination, but the molecular mechanisms through which this early protection is mediated have yet to be established. In this study, we compared the response of pigs vaccinated with the C strain to non-vaccinated pigs both challenged with a pathogenic strain of CSFV. Analysis of transcriptomic data from the tonsils of these animals during the early stages after vaccination and challenge reveals a set of regulated genes that appear throughout the analysis. Many of these are linked to the ISG15 antiviral pathway suggesting it plays a key role in the rapid and early protection conferred by C strain vaccination