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Paola Camiscia, Enrique D V Giordano, M Emilia Brassesco, Pablo Fuciños, Lorenzo Pastrana, M F Cerqueira, Guillermo A Picó, Nadia Woitovich Valetti
The cellulose from soybean hull, a waste without value from the argentine agriculture, was successfully obtained by using two different treatments: the traditional alkaline-bleaching pathway and from a simple pre-alkaline treatment at low temperatures. The comparison of both methods yielded similar results regarding its ability to open the lignin cellulosic structure of the hull and the total elimination of the lignin content. Fourier Transform Infrared spectroscopy (FT-IR), Thermogravimetric analysis (TGA), Scanning electron microscopy (SEM), 13 C nuclear magnetic resonance (13 C-RMN) and Raman spectroscopy were used to characterize the structures and the properties of cellulose...
October 15, 2018: Carbohydrate Polymers
Benjamin P Burford, Gail Lee, Daniel A Friedman, Esmé Brachmann, Rebia Khan, Dylan J MacArthur-Waltz, Aidan D McCarty, Deborah M Gordon
The collective behavior of ant colonies, and locomotion of individuals within a colony, both respond to changing conditions. The invasive Argentine ant (Linepithema humile) thrives in Mediterranean climates with hot, dry summers and colder, wet winters. However, its foraging behavior and locomotion has rarely been studied in the winter. We examined how the foraging behavior of three distinct L. humile colonies was related to environmental conditions and the locomotion of workers during winter in northern California...
2018: PloS One
Johana E Dominguez, Leandro M Redondo, Roque A Figueroa Espinosa, Daniela Cejas, Gabriel O Gutkind, Pablo A Chacana, José A Di Conza, Mariano E Fernández Miyakawa
The use of antimicrobial growth promoters (AGPs) in sub-therapeutic doses for long periods promotes the selection of resistant microorganisms and the subsequent risk of spreading this resistance to the human population and the environment. Global concern about antimicrobial resistance development and transference of resistance genes from animal to human has been rising. The goal of our research was to evaluate the susceptibility pattern to different classes of antimicrobials of colistin-resistant Escherichia coli from poultry production systems that use AGPs, and characterize the resistance determinants associated to transferable platforms...
2018: Frontiers in Microbiology
Fernando Sommerfleck, Emilce Schneeberger, Gustavo Citera
OBJECTIVE: The objective of this study was to compare the frequency of comorbidities among patients with ax-SpA in the general population and to evaluate the impact of these comorbidities on the functional status and quality of life. METHODS: Patients with ax-SpA fulfilling the modified New York 1984 criteria for Ankylosing Spondylitis (AS) and/or Assessment of SpondyloArthritis International Society (ASAS ) 2009 criteria for patients with ax-SpA belonging to the ESPAXIA cohort ("Estudio de eSPondiloartritis Axial Irep Argentina") were included...
June 22, 2018: European Journal of Rheumatology
Bruno Gastaldi, G Marino, Y Assef, F M Silva Sofrás, C A N Catalán, S B González
Six native plants of South America traditionally consumed in the Patagonian region (southern Argentina and Chile), namely: Adesmia boronioides Hook. f., Apium australe Thouars, Buddleja globosa Hope, Drimys andina (Reiche) R. Rodr. & Quezada, Dysphania multifida L. and Solidago chilensis Meyen were investigated to determine the nutraceutical properties of infusions of their aerial parts. The infusions were characterized in terms of their antioxidant activity, phenolic and flavonoid content, profile of phenolic compounds, general toxicity and cytotoxicity on two different human cell lines: T84 (derived from colon cancer) and HTR8/SVneo (not derived from cancer)...
July 30, 2018: Plant Foods for Human Nutrition
Florencia Linero, Claudia Sepúlveda, Ioanna Christopoulou, Paco Hulpiau, Luis Scolaro, Xavier Saelens
The syndrome viral haemorrhagic fever (VHF) designates a broad range of diseases that are caused by different viruses including members of the family Arenaviridae. Prophylaxis for Argentine Haemorrhagic Fever (AHF), caused by the arenavirus Junín (JUNV), has been achieved by the use of a live attenuated vaccine, named Candid#1. The standard treatment of AHF is transfusion of convalescent human plasma. Our aim was to develop an alternative and safer treatment for AHF based on the use of virus-neutralizing single domain antibodies (VHHs)...
July 30, 2018: Scientific Reports
Rosmari Lopez, Adriana Del Luján Mangani, Ernesto Maximiliano Arbeloa, Marta Mabel Luiz, María Isela Gutiérrez
The quantum yields for singlet oxygen production by diluted solutions of an Argentine crude oil and its SARA (saturates, aromatics, resins and asphaltenes) fractions were obtained by direct detection of the characteristic phosphorescence following monochromatic excitation at 355 nm. The most efficient sensitizers of singlet oxygen in organic media are crude oil, maltenes and aromatics fractions (values of singlet oxygen quantum yield are around 0.7), and resins (values around 0.1) are the poorest. Also, the quenching of singlet oxygen by the crude oil and its fractions was investigated, the asphaltenes and the petroleum are relatively efficient This article is protected by copyright...
July 30, 2018: Photochemistry and Photobiology
Elsa Baumeister, Jazmin Duque, Teresa Varela, Rakhee Palekar, Paula Couto, Vilma Savy, Carlos Giovacchini, Amber K Haynes, Brian Rha, Carmen S Arriola, Susan I Gerber, Eduardo Azziz-Baumgartner
INTRODUCTION: Within-country differences in the timing of RSV and influenza epidemics have not been assessed in Argentina, the eighth largest country in the world by area. We compared seasonality for RSV and influenza both nationally and in each of the five regions to inform Argentina's prevention and treatment guidelines. METHOD: The Argentine National Laboratories and Health Institutes Administration collected respiratory specimens from clinical practices, outbreak investigations, and respiratory virus surveillance in 2007-2016; these were tested using immunofluorescence or RT-PCR techniques...
July 26, 2018: Influenza and Other Respiratory Viruses
Antoine Felden, Carolina I Paris, David G Chapple, John Haywood, Andrew V Suarez, Neil D Tsutsui, Philip J Lester, Monica A M Gruber
1.Once established in new areas, introduced species may exhibit changes in their biology due to phenotypic plasticity, novel selection pressures and genetic drift. Moreover, the introduction process itself has been hypothesised to act as a selective filter for traits that promote invasiveness. 2.We tested the hypothesis that behaviours thought to promote invasiveness - such as increased foraging activity and aggression - are selected for during invasion by comparing traits among native and introduced populations of the widespread Argentine ant (Linepithema humile)...
July 26, 2018: Journal of Animal Ecology
Thomas L Bultman, Mark R McNeill, Kelly Krueger, Gina De Nicolo, Alison J Popay, David E Hume, Wade J Mace, Lester R Fletcher, Yew Meng Koh, Terrence J Sullivan
Epichloë fungi (Ascomycota) live within aboveground tissues of grasses and can have important implications for natural and managed ecosystems through production of alkaloids. Nonetheless, vertebrate herbivores may possess traits, like oral secretions, that mitigate effects of alkaloids. We tested if sheep saliva mitigates effects of Epichloë alkaloids on a beetle pest of perennial ryegrass (Lolium perenne L.) in a New Zealand pasture setting. Plants with one of several fungal isolates were clipped with scissors, grazed by sheep, or clipped with sheep saliva applied to cut ends of stems...
July 26, 2018: Journal of Chemical Ecology
María L Parolin, Camila Tamburrini, Luciano E Real, Néstor G Basso
We analyzed 23 Y-STR haplotypes of 139 unrelated males from Central Argentine Patagonia. A total of 133 different haplotypes (127 singletons) were observed. Haplotype diversity was similar to that previously observed in other Argentine populations and matching probability showed a strong dependence on the sample size. AMOVA carried out with full haplotypes showed significant differences between different regions of the country. The multi-dimensional scaling plot showed Chubut sample in an intermediate position among Europe and other Patagonian populations...
July 21, 2018: International Journal of Legal Medicine
Adriana Pérez, James Thrasher, Noelia Cabrera, Susan Forsyth, Lorena Peña, James D Sargent, Raúl Mejía
BACKGROUND: Our objective was to assess whether exposure to tobacco in video games is associated with smoking among adolescent gamers from Argentina. METHODS: Cross-sectional data were analysed from students in public and private middle schools in Argentina. Tobacco content in video games was estimated using previously validated methods and adolescents' tobacco exposure was assessed by multiplying tobacco content in the top three video games they play by the hours played per day...
July 20, 2018: Tobacco Control
E L Estallo, F Sangermano, M Grech, F Ludueña-Almeida, M Frías-Cespedes, M Ainete, W Almirón, T Livdahl
Aedes aegypti (Diptera: Culicidae) is an urban mosquito involved in the transmission of numerous viruses, including dengue, chikungunya and Zika. In Argentina, Ae. aegypti is the main vector of dengue virus and has been involved in several outbreaks in regions ranging from northern to central Argentina since 2009. In order to evaluate areas of potential vector-borne disease transmission in the city of Córdoba, Argentina, the present study aimed to identify the environmental, socioeconomic and demographic factors driving the distribution of Ae...
July 20, 2018: Medical and Veterinary Entomology
Stuart J Head, Milan Milojevic, Joost Daemen, Jung-Min Ahn, Eric Boersma, Evald H Christiansen, Michael J Domanski, Michael E Farkouh, Marcus Flather, Valentin Fuster, Mark A Hlatky, Niels R Holm, Whady A Hueb, Masoor Kamalesh, Young-Hak Kim, Timo Mäkikallio, Friedrich W Mohr, Grigorios Papageorgiou, Seung-Jung Park, Alfredo E Rodriguez, Joseph F Sabik, Rodney H Stables, Gregg W Stone, Patrick W Serruys, A Pieter Kappetein
BACKGROUND: Coronary artery bypass grafting (CABG) and percutaneous coronary intervention (PCI) are used for coronary revascularization in patients with multivessel and left main coronary artery disease. Stroke is among the most feared complications of revascularization. Due to its infrequency, studies with large numbers of patients are required to detect differences in stroke rates between CABG and PCI. OBJECTIVES: This study sought to compare rates of stroke after CABG and PCI and the impact of procedural stroke on long-term mortality...
July 24, 2018: Journal of the American College of Cardiology
Karina V Loiacono
INTRODUCTION: Few studies have established a relationship between adverse social conditions by geographic area (GA) and fetal mortality (FM). Objective. To assess health inequalities in relation to FM by GA. POPULATION AND METHODS: Descriptive, ecological study. The principal components of 525 GAs were analyzed. A socioeconomic status indicator and indices of inequality were developed and estimated, and the FM ratio was calculated. RESULTS: The Kunst and Mackenbach relative index of inequality ranged from 1...
August 1, 2018: Archivos Argentinos de Pediatría
Alejandro Blumenfeld, José Carrizo Olalla, Sabrina I D Angelo, Natalia S González, Yael Sadras, Sandra Graizer, Alejandro Macario, Graciela Salamanco
INTRODUCTION: Language development delay is a frequent challenge for pediatricians and other health care providers. The main objective of this study was to establish its prevalence among children attending a health care center. POPULATION AND METHODS: The expressive vocabulary of 24-month-old children attending a health care center was assessed using the Spanish language MacArthur-Bates Communicative Development Inventories, short form (Argentine version). The association between language delay and demographic, socioeconomic, behavioral/emotional, and parental stress characteristics was analyzed...
August 1, 2018: Archivos Argentinos de Pediatría
Lucas L Alonso, Pablo M Demetrio, M Agustina Etchegoyen, Damián J Marino
The presence in the atmosphere of glyphosate (GLP) and atrazine (ATZ) was investigated-those pesticides dominating the market in Argentina-through rain, as the main climatic phenomenon associated with wet deposition, both through analyzing source-receptor relationships with soil along with the climatic influences that may condition that transport and through estimating the annual deposition on the surface of the Argentine pampas. Rainwater samples (n = 112) were collected throughout each rainfall in urban areas of the pampas having different degrees of land use and with extensive crop production plus subsurface-soil samples (n = 58) from the relevant periurban sites...
July 14, 2018: Science of the Total Environment
J I Degiuseppe, J A Stupka
Argentina incorporated rotavirus massive vaccination in 2015. No specific strategy has been designed to accurately measure the impact of this recent introduction on the diarrhoeal disease burden in our country. We assessed post-vaccine introduction data (all-cause acute diarrhoea and rotavirus laboratory-confirmed cases, and genotype distribution), compared with pre-vaccination period in children under 5 years of age in Argentina. Cross-sectional ecologic analysis was conducted with data from the Argentine Surveillance Health System...
July 13, 2018: Epidemiology and Infection
Jennifer Ibarra, Roberto L Mera Y Sierra, Gisela Neira, Daniel E J Ibaceta, Miguel D Saggese
We report a case of air sac nematode ( Serratospiculum tendo) infection in an adult male Austral Peregrine Falcon ( Falco peregrinus cassini) admitted to a rehabilitation center in Mendoza Province, Argentina, in September 2017. This case of air sac nematodes reported in an Argentine raptor is only the second report of S. tendo in South America. We recommend examination of all raptors, especially those falcon species that include insects in their diet and inhabit open lands and those in rehabilitation centers or kept for falconry, education, or captive breeding...
July 12, 2018: Journal of Wildlife Diseases
Daniela Maizel, Pilar Balverdi, Barry Rosen, Adriana M Sales, Marcela A Ferrero
Arsenic hyper-tolerant bacteria were isolated from arsenic-contaminated well water from the village of Los Pereyra in Tucumán province, Argentina. Microorganisms that biotransform arsenic are a major factor in arsenic mobilization in contaminated aquifers. Groundwater analyses showed a level of arsenic contamination (average concentration of 978 µg.L<sup>-1</sup>) that exceeds the safe drinking water limit of 10 µg.L<sup>-1</sup> recommended by the World Health Organization (WHO) and the Argentine Food Code (AFC)...
July 10, 2018: Canadian Journal of Microbiology
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