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Search Results: 1 - 10 of 8162 matches for " Ignacio; ávila-Arcos "
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Prevalence of folate and vitamin B12 deficiency in Mexican children aged 1 to 6 years in a population-based survey
Cuevas-Nasu,Lucía; Mundo-Rosas,Verónica; Shamah-Levy,Teresa; Méndez-Gómez Humaran,Ignacio; ávila-Arcos,Marco Antonio; Rebollar-Campos,Ma. del Rosario; Villalpando,Salvador;
Salud Pública de México , 2012, DOI: 10.1590/S0036-36342012000200007
Abstract: objective: to describe the magnitude and distribution of folate and vitamin b12 deficiency in mexican children. materials and methods: folate and vitamin b12 serum concentrations were measured in a probabilistic sample of 2 099 children. adjusted prevalence, mean concentrations and relevant associations were calculated based on series of logistic and linear regression models. results: the overall prevalence of folate and vitamin b12 deficiency were 3.2% and 7.7%, respectively. the highest prevalence of folate was found in the 2-year-old (7.9%), and of vitamin b12 in the 1 year-old (9.1%) groups. being a beneficiary of the fortified milk program liconsa was protectively associated with serum folate (p=0.001) and daily intake of milk with vitamin b12 (p=0.002) concentrations. conclusions: we describe the magnitude of folate and vitamin b12 deficiencies in mexican children. the deficiency of both vitamins in children under 2 years old is a moderate public health problem in mexico.
Historically low mitochondrial DNA diversity in koalas (Phascolarctos cinereus)
Tsangaras Kyriakos,ávila-Arcos María C,Ishida Yasuko,Helgen Kristofer M
BMC Genetics , 2012, DOI: 10.1186/1471-2156-13-92
Abstract: Background The koala (Phascolarctos cinereus) is an arboreal marsupial that was historically widespread across eastern Australia until the end of the 19th century when it suffered a steep population decline. Hunting for the fur trade, habitat conversion, and disease contributed to a precipitous reduction in koala population size during the late 1800s and early 1900s. To examine the effects of these reductions in population size on koala genetic diversity, we sequenced part of the hypervariable region of mitochondrial DNA (mtDNA) in koala museum specimens collected in the 19th and 20th centuries, hypothesizing that the historical samples would exhibit greater genetic diversity. Results The mtDNA haplotypes present in historical museum samples were identical to haplotypes found in modern koala populations, and no novel haplotypes were detected. Rarefaction analyses suggested that the mtDNA genetic diversity present in the museum samples was similar to that of modern koalas. Conclusions Low mtDNA diversity may have been present in koala populations prior to recent population declines. When considering management strategies, low genetic diversity of the mtDNA hypervariable region may not indicate recent inbreeding or founder events but may reflect an older historical pattern for koalas.
Optimization of DNA Recovery and Amplification from Non-Carbonized Archaeobotanical Remains
Nathan Wales, Kenneth Andersen, Enrico Cappellini, María C. ávila-Arcos, M. Thomas P. Gilbert
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0086827
Abstract: Ancient DNA (aDNA) recovered from archaeobotanical remains can provide key insights into many prominent archaeological research questions, including processes of domestication, past subsistence strategies, and human interactions with the environment. However, it is often difficult to isolate aDNA from ancient plant materials, and furthermore, such DNA extracts frequently contain inhibitory substances that preclude successful PCR amplification. In the age of high-throughput sequencing, this problem is even more significant because each additional endogenous aDNA molecule improves analytical resolution. Therefore, in this paper, we compare a variety of DNA extraction techniques on primarily desiccated archaeobotanical remains and identify which method consistently yields the greatest amount of purified DNA. In addition, we test five DNA polymerases to determine how well they replicate DNA extracted from non-charred ancient plant remains. Based upon the criteria of resistance to enzymatic inhibition, behavior in quantitative real-time PCR, replication fidelity, and compatibility with aDNA damage, we conclude these polymerases have nuanced properties, requiring researchers to make educated decisions as to which one to use for a given task. The experimental findings should prove useful to the aDNA and archaeological communities by guiding future research methodologies and ensuring precious archaeobotanical remains are studied in optimal ways, and may thereby yield important new perspectives on the interactions between humans and past plant communities.
North African Populations Carry the Signature of Admixture with Neandertals
Federico Sánchez-Quinto, Laura R. Botigué, Sergi Civit, Conxita Arenas, María C. ávila-Arcos, Carlos D. Bustamante, David Comas, Carles Lalueza-Fox
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0047765
Abstract: One of the main findings derived from the analysis of the Neandertal genome was the evidence for admixture between Neandertals and non-African modern humans. An alternative scenario is that the ancestral population of non-Africans was closer to Neandertals than to Africans because of ancient population substructure. Thus, the study of North African populations is crucial for testing both hypotheses. We analyzed a total of 780,000 SNPs in 125 individuals representing seven different North African locations and searched for their ancestral/derived state in comparison to different human populations and Neandertals. We found that North African populations have a significant excess of derived alleles shared with Neandertals, when compared to sub-Saharan Africans. This excess is similar to that found in non-African humans, a fact that can be interpreted as a sign of Neandertal admixture. Furthermore, the Neandertal's genetic signal is higher in populations with a local, pre-Neolithic North African ancestry. Therefore, the detected ancient admixture is not due to recent Near Eastern or European migrations. Sub-Saharan populations are the only ones not affected by the admixture event with Neandertals.
Iron, zinc, copper and magnesium nutritional status in Mexican children aged 1 to 11 years
Morales-Ruán,Ma. del Carmen; Villalpando,Salvador; García-Guerra,Armando; Shamah-Levy,Teresa; Robledo-Pérez,Ricardo; ávila-Arcos,Marco Antonio; Rivera,Juan A.;
Salud Pública de México , 2012, DOI: 10.1590/S0036-36342012000200008
Abstract: objective: to describe the micronutrient nutritional status of a national sample of 1-11 year old mexican children surveyed in 2006 in national health and nutrition survey (ensanut 2006) and their association with dietary and sociodemographic factors. materials and methods: serum samples were used (n=5 060) to measure the concentrations of ferritin, transferrin receptor, zinc, copper and magnesium. results: prevalence of deficiencies in 1-4 and 5-11y old children were for iron (using low ferritin) 26.0 and 13.0%; zinc, 28.1 and 25.8%, respectively; and copper, ≈30% in both age groups. magnesium low serum concentrations (mlsc), were found in 12.0% and 28.4% of the children, respectively. being beneficiary of liconsa (or=0.32; c.i.95%, 0.17-0.61) or belonging to higher socioeconomic status (or=0.63; c.i.95%, 0.41-0.97) were protective against iron deficiency. increasing age (or=0.59; c.i.95%, 1.19-1.32) and living in the central region (or=0.59; c.i.95%, 0.36-0.97) were protective against mlsc. conclusions: deficiencies of iron and zinc are serious public health problems in mexican children.
Discusiones Filosóficas , 2006,
Abstract: this paper is a rejoinder to professor pablo arango's criticisms. it is argued, mainly, that even arango's observations to the contrary, essentialism cannot face an interesting version of conceptual relativity, that the argument that goes from rigid designation to essentialism is not conclusive, and that essentialist metaphysics violates the principle of substitutivity of correferring terms.
Por qué todo el mundo quiere ver mi celulitis?
Panace@ : Revista de Medicina, Lenguaje y Traducción , 2004,
Prioridades de intervención para la fase aguda de las emergencias complejas formuladas por nueve agencias de ayuda humanitaria
Carrillo Jaimes,Carmen Sofía; Arcos González,Pedro Ignacio;
Revista Espa?ola de Salud Pública , 2004, DOI: 10.1590/S1135-57272004000600003
Abstract: background: complex emergencies are an international public health problem currently becoming increasingly more frequent and of growing proportions which lead to major death and disease rates, especially during the acute stage thereof. this study is aimed at identifying and analyzing the top-priority areas of intervention in the acute stage of a complex emergency drafted in the operating manuals of the main aid agencies, as well as the degree of development and structuring of the activities proposed in each area on which priority has been placed. methods: the intervention manuals drafted by nine major aid agencies were used as study material. a quantitative analysis was then made of the 16 intervention priorities set out, as well as of the degree to which each priority was defined based on the development of 73 variables of aspects of the proposals set out in the manuals. results: the acnur manual includes 90% of the 73 variables for further expansion upon the priorities, the un humanitarian affaire coordination office manual including 35% of the 73 variables. acnur better expands upon the non-healthcare variables, followed by msf and usaid. doctors without borders shows a 97.3% degree of expansion of the healthcare variables) followed by acnur (94.7%), usaid (92.1%). conclusions: acnur has been found to have the most integral proposal, the un humanitarian affairs coordination office having the most discreet. there is a general trend toward further expanding upon and unifying the health indicators, whilst other aspects are not further expanded upon.
Un caso de polidactilia en Liolaemus petrophilus (Iguania: Squamata: Liolaemini)
Minoli, Ignacio,Feltrin, Natalia,ávila, Luciano Javier
Cuadernos de Herpetología , 2009,
Abstract: Se encontró un individuo con un dígito adicional. Es un ejemplar juvenil macho, con un LHC de 55,61 mm. La extremidad anterior izquierda presenta 6 dígitos (Fig. 1). Las otras extremidades son completamente normales. El análisis radiográfico sobre este ejemplar evidencia que la polidactilia aparece por una ramificación del metacarpiano I (Fig. 2). A partir de esta ramificación las falanges son completamente independientes, de manera que el dedo I está formado por dos dígitos desiguales en longitud y grosor (Fig. 2). El ejemplar fue depositado en la colección herpetológica del Museo de la Plata, La Plata, Buenos Aires, Argentina (MLP.S 2604).
Desastres y salud pública: Un abordaje desde el marco teórico de la epidemiología
Arcos González,Pedro Ignacio; Castro Delgado,Rafael; Busto Prado,Francisco del;
Revista Espa?ola de Salud Pública , 2002, DOI: 10.1590/S1135-57272002000200006
Abstract: throughout the1990-2000 period, disasters (catastrophes) caused an average of 75,000 deaths yearly, injuring an average of 256 million people a year and causing economic losses totaling more than 650 billion euros. the magnitude of this problem, its impact on public health and on the degree of development of the populations involved are of such major importance as to warrant special interest from the public health standpoint, especially as a result of what are known as complex emergencies. the objective of this study is that of reviewing the definitions, the main concepts and the basic characteristics of disaster epidemiology. an analysis is also made of the risk factors involved in disasters, the impacts on public health of the main types of disasters and the main preventive strategies in terms of the different stages of the disaster cycle.
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