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Introducción: Las picaduras de serpientes constituyen un grave problema de Salud Pública. Objetivo: Describir los casos de mordeduras de serpientes notificados al Programa Nacional de Control de Zoonosis y Centro Antirrábico Nacional, Paraguay durante el año 2015. Método: Estudio observacional, descriptivo, retrospectivo y de corte transversal. Los criterios de inclusión fueron toda persona que haya sido mordida por alguna serpiente y que haya sido notificado al Programa Nacional de Control de Zoonosis y Centro Antirrábico Nacional durante el año 2015. Tipo de muestreo no probabilístico. Resultados: Fueron notificados 169 casos de mordeduras de serpientes. De acuerdo con las características sociodemográficas, la mayoría de los afectados fueron varones, con una edad promedio de 26,39 ±1.36. Los lugares más frecuentes donde ocurrieron los accidentes ofídicos fueron las chacras, y en el Departamento de San Pedro. En la mayoría de las mordeduras no se pudo identificar a la serpiente agresora, y cuando fueron identificadas, fueron las del genero Bothrops, las más frecuentes. En cuanto a la localización de las picaduras, fueron más frecuentes en los miembros inferiores, siendo necesario la hospitalización para el tratamiento. No se reportaron fallecidos. Conclusión: En el año 2015 fueron notificados 169 casos, los departamentos con mayor prevalência fueron San Pedro, Itapúa y Caazapá. El perfil del afectado es un varón con promedio de edad de 26 años, trabajador rural. Las serpientes del género Bothrops causaron el 32,5% de las mordeduras. Palabras clave: Mordeduras de serpiente; Envenenamiento; Epidemiología.

Introduction: Snake bites are a serious public health problem. Objective: To describe the cases of snake bites reported to the National Zoonosis Control Program and National Anti-Rabies Center, Paraguay during 2015. Method: Observational, descriptive, retrospective and cross-sectional study. The inclusion criteria were any person who has been bitten by a snake and it has been notified to the National Zoonosis Control Program and National Anti-Rabies Center during 2015. Type of non-probabilistic sampling. Results: 169 cases of snake bites were reported. According to the sociodemographic characteristics, the majority of those affected were males, with an average age of 26.39 ± 1.36. The most frequent places where theophidic accidents occurred were the farms, and in the Department of San Pedro. In most of the bites the aggressor snake could not be identified, and when they were identified, they were those of the genus Bothrops, the most frequent. As for the location of the bites, they were more frequent in the lower limbs, requiring hospitalization for treatment. No deaths were reported. Conclusion: In the year 2015, 169 cases were notified, the departments with the highest prevalence were San Pedro, Itapua and Caazapá. The profile of the affected is a male with an average age of 26 years, a rural worker. The snakes of the genus Bothrops caused 32.5% of the bites. Keywords: Snake bites; Poisoning; Epidemiology.

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In a previous study we showed that Cistus albidus (L.) experiences an age-dependent decay in flower vigour correlated with a decline in trans-zeatin (tZ) levels. In the present study we aimed to establish a causal relationship between these two phenomena. Exogenous tZ applied to plants grown under semi-controlled conditions did not rescue flower vigour; however, it accelerated flower development, but only in younger individuals. Older plants showed lower tocopherol levels in flower buds, which were restored by exogenous tZ, suggesting that a loss of antioxidant defences may underlie the age-dependent decay in flower vigour. We conclude that declining tZ levels may not be directly responsible for the age-associated loss of floral vigour; that tZ modulates the speed of flower development as plants age; and that flower buds alter their sensitivity to tZ as plants age.

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La Fiebre Amarilla (FA) es una de las más importantes zoonosis que afecta a poblaciones humanas. La FA silvestre es imposible de ser erradicada, manteniéndose activa en zonas tropicales en África y Sudamérica. Todas las especies de primates son susceptibles y se consideran reservorios en el medio silvestre. La mortalidad es baja, se desconoce su valor con precisión, sin embargo existen epizootias con alta mortalidad, en humanos varía entre 20-50%. El objetivo de este trabajo fue buscar evidencias de FA en primates capturados en áreas de brote de FA de los departamentos de San Pedro y Central del Paraguay mediante la técnica de Neutralización por reducción de placas para FA cepa vacunal 17 D. Los resultados en los 35 primates estudiados fueron negativos, quizás por lo tardío del momento en la toma de muestras y bajo número de primates capturados.

Yellow Fever (YF) is one of the most important zoonotic diseases affecting human population. It is impossible to eradicate wild YF remaining active in tropical zones of Africa and South America. All species of primates are susceptible and are considered reservoirs in wild regions. Mortality is low and its precise value is unknown though there are epizootics with high mortality rates and in humans varies between 20-50%. The objective of this study was to search for evidence of YF in primates caught in YF outbreaks areas of the departments of San Pedro and Central in Paraguay through the neutralization technique by plates reduction for YF vaccine strain 17 D. The results in the 35 primates studied were negative, perhaps because of the lateness of the time sampling and the low number of captured primates.

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We theoretically identify some photonic-crystal-fiber structures, made up of soft glass, that generate ultrawide (over an octave) and very smooth supercontinuum spectra when illuminated with femtosecond pulsed light. The design of the fiber geometry in order to reach a nearly ultraflattened normal dispersion behavior is crucial to accomplish the above goal. Our numerical simulations reveal that these supercontinuum sources show high stability and no significant changes are detected even for fairly large variations of the incident pulse.

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The Leishmania species present a genetic homology that ranges from 69 to 90%. Because of this homology, heterologous antigens have been used in the immunodiagnosis and vaccine development against Leishmania infections. In the current work, we describe the identification of species-specific and cross-reactive antigens among several New World Leishmania species, using symptomatic and asymptomatic naturally Leishmania chagasi-infected dog sera. Soluble antigens from five strains of New World Leishmania were separated by electrophoresis in SDS-PAGE and immunoblotted. Different proteins were uniquely recognized in the L. chagasi panel by either symptomatic or asymptomatic dog sera suggesting their use as markers for the progression of disease and diagnosis of the initial (sub-clinical) phase of the infection. Cross-reactive antigens were identified using heterologous antigenic panels (L. amazonensis strains PH8 and BH6, L. guyanensis and L. braziliensis). L. guyanensis panel showed the highest cross-reactivity against L. chagasi specific antibodies, suggesting that proteins from this extract might be suitable for the diagnosis of visceral canine leishmaniasis. Interestingly, the 51 and 97 kDa proteins of Leishmania were widely recognized (77.8% to 100%) among all antigenic panels tested, supporting their potential use for immunodiagnosis. Finally, we identified several leishmanial antigens that might be useful for routine diagnosis and seroepidemiological studies of the visceral canine leishmaniasis.

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Rickettsia slovaca, the causative agent of TIBOLA, is transmitted by Dermacentor ticks. Dermacentor marginatus is the most widely species distributed in northeastern Spain, and the wild boar constitutes the main host. D. marginatus ticks were collected from hunter-killed wild boar and were tested by PCR/RFLP. Rickettsial DNA-positive ticks were sequenced using the ompA PCR primers. The prevalence of R. slovaca in D. marginatus ticks was 17.7%. Other spotted fever group rickettsiae were detected in ticks, but these were not definitely identified.

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We present two algorithms to perform computations over Markov chains. The first one determines whether the sequence of powers of the transition matrix of a Markov chain converges or not to a limit matrix. If it does converge, the second algorithm enables us to estimate this limit. The combination of these algorithms allows the computation of a limit using DNA computing. In this sense, we have encoded the states and the transition probabilities using strands of DNA for generating paths of the Markov chain.

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Dyspnea, angor and syncope are the most characteristic symptoms in stenosis aortic valve disease. Sudden death, as part of natural history of symptomatic stenosis aortic valve, is well know. On the other hand, sudden death in asymptomatic stenosis aortic valve is rarer. Different guidelines recommend a conservative management of these patients. We present here the case of a 58 year old woman, previously healthy, who arrived at Hospital because of sudden dyspnea at rest. The patient was diagnosed of pulmonary edema and died two hours later. Necropsy showed a stenosis aortica valve with a valve area of less than 0.8 cm2. We make a short review in medical literature about the incidence of sudden death in asymptomatic stenosis aortic valve, the risk groups and their management.

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Disnea, angor y síncope son las manifestaciones características de la estenosis valvular aórtica sintomática. La presencia de muerte súbita es una complicación potencial en este grupo de pacientes, pero es infrecuente en los sujetos con estenosis valvular aórtica asintomática. Esta baja incidencia hace que se recomiende un tratamiento conservador en los sujetos que no presentan síntomas. Presentamos el caso de una mujer de 58 años, sin antecedentes patológicos de interés, que acudió al Hospital por disnea súbita en reposo. Diagnosticada de edema agudo de pulmón, la paciente falleció dos horas después del comienzo de los síntomas. La necropsia mostró la existencia de una estenosis valvular aórtica con un área valvular de menos de 0.8 cm2. Realizamos una breve revisión de la bibliografía acerca de la incidencia de muerte súbita en sujetos con estenosis valvular asintomática, analizando los grupos de mayor riesgo y su tratamiento (AU)

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INTRODUCTION: In the clinical daily practice, exist multiple situations in which could produce phenomenons of serious hypoxia to encephalic level, normally with important repercussions for the patient. OBJECTIVES: Study if after the existence of a situation of serious encephalic hypoxia, any typical pattern in the exploration transcranial Doppler (TCD) exists, and the possible diagnostic and/or prognostic implications could bear. PATIENTS AND METHODS: We presented 10 patients admitted in our Unit of Intensive Care, for clinical situations in which a situation of encephalic hypoxia took place and to which was practiced a TCD like exploration of encephalic flow. We related the discoveries of the DTC, with the clinical situation, the images of the cerebral computed tomography in three of the patients, and the data of the electroencephalogram in the other seven. Like statistical tool, is used the test of square ji, demanding a confidence interval of the 95%. RESULTS: In all the patients, we found a patron TCD, of high speed mean with low Pulsatility Index. Nine patients died, surviving with serious sequels the last patient. CONCLUSIONS: In our series, we could conclude, that the existence of a patron TCD with high speed mean and with low Pulsatility Index, after an episode of brain hypoxia, its associated to a wrong presage, existing a high risk of death of the patient.

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Small looped mispairs are efficiently corrected by mismatch repair. The situation with larger loops is less clear. Repair activity on large loops has been reported as anywhere from very low to quite efficient. There is also uncertainty about how many loop repair activities exist and whether any are conserved. To help address these issues, we studied large loop repair in Saccharomyces cerevisiae using in vivo and in vitro assays. Transformation of heteroduplexes containing 1, 16 or 38 nt loops led to >90% repair for all three substrates. Repair of the 38 base loop occurred independently of mutations in key genes for mismatch repair (MR) and nucleotide excision repair (NER), unlike other reported loop repair functions in yeast. Correction of the 16 base loop was mostly independent of MR, indicating that large loop repair predominates for this size heterology. Similarities between mammalian and yeast large loop repair were suggested by the inhibitory effects of loop secondary structure and by the role of defined nicks on the relative proportions of loop removal and loop retention products. These observations indicate a robust large loop repair pathway in yeast, distinct from MR and NER, and conserved in mammals.

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Trinucleotide repeat (TNR) instability in humans is governed by unique cis-elements. One element is a threshold, or minimal repeat length, conferring frequent mutations. Since thresholds have not been directly demonstrated in model systems, their molecular nature remains uncertain. Another element is sequence specificity. Unstable TNR sequences are almost always CNG, whose hairpin-forming ability is thought to promote instability by inhibiting DNA repair. To understand these cis-elements further, TNR expansions and contractions were monitored by yeast genetic assays. A threshold of approximately 15--17 repeats was observed for CTG expansions and contractions, indicating that thresholds function in organisms besides humans. Mutants lacking the flap endonuclease Rad27p showed little change in the expansion threshold, suggesting that this element is not altered by the presence or absence of flap processing. CNG or GNC sequences yielded frequent mutations, whereas A-T rich sequences were substantially more stable. This sequence analysis further supports a hairpin-mediated mechanism of TNR instability. Expansions and contractions occurred at comparable rates for CTG tract lengths between 15 and 25 repeats, indicating that expansions can comprise a significant fraction of mutations in yeast. These results indicate that several unique cis-elements of human TNR instability are functional in yeast.

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We present a systematic study of group-velocity-dispersion properties in photonic crystal fibers (PCF's). This analysis includes a thorough description of the dependence of the fiber geometrical dispersion on the structural parameters of a PCF. The interplay between material dispersion and geometrical dispersion allows us to established a well-defined procedure to design specific predetermined dispersion profiles. We focus on flattened, or even ultraflattened, dispersion behaviors both in the telecommunication window (around 1.55 microm) and in the Ti-Za laser wavelength range (around 0.8 microm}. We show the different possibilities of obtaining normal, anomalous, and zero dispersion curves in the above frequency domains and discuss the limits for the existence of the above dispersion profiles.

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We present a procedure for achieving photonic crystal fibers with nearly zero ultraflattened group-velocity dispersion. Systematic knowledge of the special guiding properties of these fibers permits the achievement of qualitatively novel dispersion curves. Unlike the behavior of conventional fibers, this new type of dispersion behavior permits remarkably improved suppression of third-order dispersion, particularly in the low-dispersion domain.