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Michael Schmid, Claus Steinlein
A detailed cytogenetic study on the leaf litter frog Eleutherodactylus johnstonei from 14 different Caribbean islands and the mainlands of Venezuela and Guyana revealed the existence of multimorphic XY♂/XX♀ sex chromosomes 14. Their male sex determination and development depends either on the presence of 2 telocentric chromosomes 14 (XtYt), or on 1 submetacentric chromosome 14 (Xsm) plus 1 telocentric chromosome 14 (Yt), or on the presence of 2 submetacentric chromosomes 14 (XsmYsm). The female sex determination and development requires either the presence of 2 telocentric chromosomes 14 (XtXt) or 2 submetacentric chromosomes 14 (XsmXsm)...
March 16, 2018: Cytogenetic and Genome Research
Juan P González-Rivas, Ramfis Nieto-Martínez, Imperia Brajkovich, Eunice Ugel, Alejandro Rísquez
BACKGROUND: The prevalence of dyslipidemia in multiple regions of Venezuela is unknown. The Venezuelan Metabolic Syndrome, Obesity and Lifestyle Study (VEMSOLS) was undertaken to evaluate cardiometabolic risk factors in Venezuela. OBJECTIVE: To determine the prevalence of dyslipidemia in five populations from three regions of Venezuela. METHODS: During the years 2006 to 2010, 1320 subjects aged 20 years or older were selected by multistage stratified random sampling from all households in five municipalities from 3 regions of Venezuela: Lara State (Western region), Merida State (Andean region), and Capital District (Capital region)...
January 2018: Arquivos Brasileiros de Cardiologia
Fernando A Poletta, Monica Rittler, Cesar Saleme, Hebe Campaña, Juan A Gili, Mariela S Pawluk, Lucas G Gimenez, Viviana R Cosentino, Eduardo E Castilla, Jorge S López-Camelo
BACKGROUND: Historically, neural tube defects (NTDs) have predominated in female infants but the reasons remain unclear. In South America, the pre- folic acid fortification (FAF) rates of NTDs were around 18/10,000 births for females and 12/10,000 births for males, with an estimated sex ratio (male/female) of 0.67. During the post- FAF period, unpublished routine reports have indicated changes in the sex ratio for these defects while some descriptive reports are controversial. To date and to our knowledge, however, no studies specifically focusing on these changes to test this hypothesis directly have been undertaken...
2018: PloS One
Jeong Sang Yi, Minsuk Kim, Eun-Jung Kim, Byung-Gee Kim
Branched chain amino acids (BCAA) are catabolized into various acyl-CoA compounds, which are key precursors used in polyketide productions. Because of that, BCAA catabolism needs fine tuning of flux balances for enhancing the production of polyketide antibiotics. To enhance BCAA catabolism for pikromycin production in Streptomyces venezuelae ATCC 15439, three key enzymes of BCAA catabolism, 3-ketoacyl acyl carrier protein synthase III, acyl-CoA dehydrogenase, and branched chain α-keto acid dehydrogenase (BCDH) were manipulated...
March 10, 2018: Journal of Industrial Microbiology & Biotechnology
David A Prieto-Torres, Andrés M Cuervo, Elisa Bonaccorso
We studied the phylogeography and plumage variation of the Russet-crowned Warbler (Myiothlypis coronata), from Venezuela to Bolivia, with focus on populations from Ecuador and northern Peru. We analyzed sequences of mitochondrial and nuclear genes, geographic distributions, as well as photographs of specimens deposited at museum collections. Phylogenetic analyses identified three major lineages formed by populations from: Venezuela and Colombia (M. c. regulus), Ecuador and northern Peru (M. elata, M. castaneiceps, M...
2018: PloS One
A Ortega-Morales, J A Garza-Hernández, V H González-Álvarez, L M Hernández-Triana, M A Rodríguez-Pérez
Culex (Microculex) daumastocampa Dyar & Knab was originally described by Dyar and Knab (Proc US Nat Mus 35:53-70, 1908) from larvae collected at axils of bromeliads in Port San Felipe, Panama. Culex daumastocampa is found in Colombia, Venezuela, Panama, Suriname, Costa Rica, Nicaragua, Guatemala, and Mexico, although its presence had not been reported suggesting its northernmost distribution. In Mexico, the subgenus Microculex had included Cx. rejector Dyar and Knab, and Cx. imitator Theobald. However, after that collection specimens were re-examined along with other specimens collected during 2016 in Chiapas (all specimens are available in the Culicidae Collection of the Universidad Autonoma Agraria Antonio Narro Unidad Laguna [UAAAN-UL], Mexico)...
March 8, 2018: Neotropical Entomology
Alejandra Carrillo Roa
The situation in Venezuela is marked by a profound socioeconomic crisis that raises questions concerning its effects on the health system. The study's aim was to analyze the trends and current situation of the Venezuelan health system, with special emphasis on financing. Based on the World Health Organization's Framework for Action to Strengthen Health Systems, five of the system's six basic components were studied, along with the results in terms of coverage and the population's health. Healthcare financing in Venezuela proved to be primarily private, with a high and growing share of out-of-pocket expenditures, one of the highest in the world...
March 5, 2018: Cadernos de Saúde Pública
Anna M Stewart-Ibarra, Sadie J Ryan, Aileen Kenneson, Christine A King, Mark Abbott, Arturo Barbachano-Guerrero, Efraín Beltrán-Ayala, Mercy J Borbor-Cordova, Washington B Cárdenas, Cinthya Cueva, Julia L Finkelstein, Christina D Lupone, Richard G Jarman, Irina Maljkovic Berry, Saurabh Mehta, Mark Polhemus, Mercy Silva, Timothy P Endy
Here, we report the findings from the first 2 years of an arbovirus surveillance study conducted in Machala, Ecuador, a dengue-endemic region (2014-2015). Patients with suspected dengue virus (DENV) infections (index cases, N = 324) were referred from five Ministry of Health clinical sites. A subset of DENV-positive index cases ( N = 44) were selected, and individuals from the index household and four neighboring homes within 200 m were recruited ( N = 400). Individuals who entered the study, other than the index cases, are referred to as associates...
March 5, 2018: American Journal of Tropical Medicine and Hygiene
Yongjin Liu, Steven Kyle, Paul D Straight
Competitive interactions between bacteria reveal physiological adaptations that benefit fitness. Bacillus subtilis is a Gram-positive species with several adaptive mechanisms for competition and environmental stress. Biofilm formation, sporulation, and motility are the outcomes of widespread changes in a population of B. subtilis . These changes emerge from complex, regulated pathways for adapting to external stresses, including competition from other species. To identify competition-specific functions, we cultured B...
January 2018: MSphere
José Ferreira Saraiva, Raimundo Nonato Picanço Souto, Vera Margarete Scarpassa
Recent studies have shown that Anopheles oswaldoi sensu lato comprises a cryptic species complex in South America. Anopheles konderi, which was previously raised to synonymy with An. oswaldoi, has also been suggested to form a species complex. An. oswaldoi has been incriminated as a malaria vector in some areas of the Brazilian Amazon, Colombia, Peru and Venezuela, but was not recognized as a vector in the remaining regions in its geographic distribution. The role of An. konderi as a malaria vector is unknown or has been misattributed to An...
2018: PloS One
María Araque, Indira Labrador
Objectives: Antimicrobial resistant extended-spectrum-β-lactamase-producing Enterobacteriaceae (ESBL-PE) have been shown to be present in healthy communities. This study examined healthy children from the rural Andean village of Llano del Hato, Mérida, Venezuela, who have had little or no antibiotic exposure to determine the prevalence of fecal carriage of ESBL-producing Escherichia coli (ESBL-EC). Methods: A total of 78 fecal samples were collected in healthy children aged from 1 to 5 years...
January 2018: Osong Public Health and Research Perspectives
Carlos De Las Cuevas, Mariano Motuca, Trino Baptista, Jose de Leon
Background: Cultural differences in attitudes toward psychiatric medications influence medication adherence but transcultural studies are missing. The objective of this study was to investigate how attitudes and beliefs toward psychotropic medications influence treatment adherence in psychiatric outpatients in Spain, Argentina, and Venezuela. Methods: A cross-sectional, cross-cultural psychopharmacology study was designed to assess psychiatric outpatients' attitudes toward their prescribed medication...
2018: Patient Preference and Adherence
Rafael Lucas Muniz Guedes, Carla Monadeli Filgueira Rodrigues, Nicolas Coatnoan, Alain Cosson, Fabiano Antonio Cadioli, Herakles Antonio Garcia, Alexandra Lehmkuhl Gerber, Rosangela Zacarias Machado, Paola Marcella Camargo Minoprio, Marta Maria Geraldes Teixeira, Ana Tereza Ribeiro de Vasconcelos
Trypanosoma vivax is a parasite widespread across Africa and South America. Immunological methods using recombinant antigens have been developed aiming at specific and sensitive detection of infections caused by T. vivax. Here, we sequenced for the first time the transcriptome of a virulent T. vivax strain (Lins), isolated from an outbreak of severe disease in South America (Brazil) and performed a computational integrated analysis of genome, transcriptome and in silico predictions to identify and characterize putative linear B-cell epitopes from African and South American T...
February 27, 2018: Genomics
Martin J Prince, Daisy Acosta, Mariella Guerra, Yueqin Huang, Ivonne Z Jimenez-Velazquez, Juan J Llibre Rodriguez, Aquiles Salas, Ana Luisa Sosa, Kia-Chong Chua, Michael E Dewey, Zhaorui Liu, Rosie Mayston, Adolfo Valhuerdi
BACKGROUND: Exposure to endogenous estrogen may protect against dementia, but evidence remains equivocal. Such effects may be assessed more precisely in settings where exogenous estrogen administration is rare. We aimed to determine whether reproductive period (menarche to menopause), and other indicators of endogenous estrogen exposure are inversely associated with dementia incidence. METHODS: Population-based cohort studies of women aged 65 years and over in urban sites in Cuba, Dominican Republic, Puerto Rico and Venezuela, and rural and urban sites in Peru, Mexico and China...
2018: PloS One
Joe Parkin Daniels
No abstract text is available yet for this article.
March 2018: Lancet Infectious Diseases
Ana C Alcalá, Kriss Pérez, Ruth Blanco, Rosabel González, Juan E Ludert, Ferdinando Liprandi, Esmeralda Vizzi
Background: The role of rotavirus as main etiologic agent of diarrhea has been well documented worldwide, including in Venezuela. However, information about the prevalence of gastrointestinal viruses such as calicivirus, adenovirus and astrovirus is limited and the contribution of other agents as Aichi virus and klassevirus is largely unknown. To explore the etiological spectrum of diarrhea associated with agents other than rotaviruses, 227 stool samples from children under 5 years old with acute gastroenteritis, collected in Valencia (Venezuela) from 2001 to 2005, and previously tested as rotavirus-negative, were analyzed for caliciviruses, adenoviruses, astroviruses, Aichi viruses, klasseviruses, picobirnaviruses and enteroviruses by specific RT-PCRs...
2018: Gut Pathogens
Yeonjin Ko, Geng-Min Lin, Mark W Ruszczycky, Hung-Wen Liu
DesII is a radical SAM lyase that catalyzes a deami- nation reaction during the biosynthesis of desosamine in Strep- tomyces venezuelae. Competing mechanistic hypotheses for this radical-mediated reaction are differentiated according to whether or not a 1,2-migration takes place and the timing of proton abstraction following generation of a substrate α- hydroxyalkyl radical intermediate. In the present study, the deuterated C4-epimer of the natural substrate, TDP-4-amino-4- deoxy-d-[3-2H]fucose, was prepared and shown to be a substrate for DesII undergoing deamination alone with a specific activity that is only marginally reduced (ca...
February 23, 2018: Biochemistry
Mauricio Sauerbrey, Lindsay J Rakers, Frank O Richards
The Onchocerciasis Elimination Program for the Americas (OEPA) is a regional initiative and international partnership that has made considerable progress toward its goal since it was launched in 1993. Its strategy is based on mass drug administration of ivermectin (Mectizan, donated by MSD, also known as Merck & Co., Inc., Kenilworth, NJ, USA), twice or four times per year, with at least 85% coverage of eligible populations. From 1989 to 2016, 11 741 276 ivermectin treatments have been given in the Americas, eliminating transmission in 11 of 13 foci...
March 1, 2018: International Health
M C Pineda, J Viloria, J A Martínez-Casasnovas, A Valera, D Lobo, L C Timm, L F Pires, D Gabriels
Soil water content is a key property in the study of water available for plants, infiltration, drainage, hydraulic conductivity, irrigation, plant water stress and solute movement. However, its measurement consumes time and, in the case of stony soils, the presence of stones difficult to determinate the water content. An alternative is the use of pedotransfer functions (PTFs), as models to predict these properties from readily available data. The present work shows a comparison of different widely used PTFs to estimate water content at-33 kPa (WR-33kPa ) in high stoniness soils...
February 22, 2018: Environmental Monitoring and Assessment
Maria TR Borges
In the United States, women are routinely forced to undergo cesarean sections, episiotomies, and the use of forceps, despite their desire to attempt natural vaginal delivery. Yet, the current American legal system does little to provide redress for women coerced to undergo certain medical procedures during childbirth. Courts and physicians alike are prepared to override a woman's choice of childbirth procedure if they believe this choice poses risks to the fetus, and both give little value to the woman's right to bodily autonomy...
January 2018: Duke Law Journal
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