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https://www.readbyqxmd.com/read/28194224/carbon-uptake-by-mature-amazon-forests-has-mitigated-amazon-nations-carbon-emissions
#1
Oliver L Phillips, Roel J W Brienen
BACKGROUND: Several independent lines of evidence suggest that Amazon forests have provided a significant carbon sink service, and also that the Amazon carbon sink in intact, mature forests may now be threatened as a result of different processes. There has however been no work done to quantify non-land-use-change forest carbon fluxes on a national basis within Amazonia, or to place these national fluxes and their possible changes in the context of the major anthropogenic carbon fluxes in the region...
December 2017: Carbon Balance and Management
https://www.readbyqxmd.com/read/28194144/trophic-interactions-of-infant-bifidobacteria-and-eubacterium-hallii-during-l-fucose-and-fucosyllactose-degradation
#2
Clarissa Schwab, Hans-Joachim Ruscheweyh, Vera Bunesova, Van Thanh Pham, Niko Beerenwinkel, Christophe Lacroix
Fucosyllactoses (2'- or 3'-FL) account for up to 20% of human milk oligosaccharides (HMOs). Infant bifidobacteria, such as Bifidobacterium longum subsp. infantis, utilize the lactose moiety to form lactate and acetate, and metabolize L-fucose to 1,2-propanediol (1,2-PD). Eubacterium hallii is a common member of the adult gut microbiota that can produce butyrate from lactate and acetate, and convert 1,2-PD to propionate. Recently, a Swiss cohort study identified E. hallii as one of the first butyrate producers in the infant gut...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28192446/range-extension-for-the-common-dolphin-delphinus-sp-to-the-colombian-caribbean-with-taxonomic-implications-from-genetic-barcoding-and-phylogenetic-analyses
#3
Nohelia Farías-Curtidor, Dalia C Barragán-Barrera, Paula Alejandra Chávez-Carreño, Cristina Jiménez-Pinedo, Daniel M Palacios, Dalila Caicedo, Fernando Trujillo, Susana Caballero
The nearest known population of common dolphins (Delphinus sp.) to the Colombian Caribbean occurs in a fairly restricted range in eastern Venezuela. These dolphins have not been previously reported in the Colombian Caribbean, likely because of a lack of study of the local cetacean fauna. We collected cetacean observations in waters of the Guajira Department, northern Colombia (~11°N, 73°W) during two separate efforts: (a) a seismic vessel survey (December 2009-March 2010), and (b) three coastal surveys from small boats (May-July 2012, May 2013, and May 2014)...
2017: PloS One
https://www.readbyqxmd.com/read/28191923/one-pot-combinatorial-biosynthesis-of-glycosylated-anthracyclines-by-co-cultivation-of-streptomyces-strains-producing-aglycones-and-nucleotide-deoxysugars
#4
Eunji Kim, Myoung Chong Song, Myoun Su Kim, Ji Yoon Beom, Jin A Jung, Hang Soo Cho, Yeo Joon Yoon
Anthracyclines such as doxorubicin are effective anticancer drugs composed of a tetracyclic polyketide aglycone and one or more deoxysugar moieties, which play a critical role in their biological activity. A facile one-pot combinatorial biosynthetic system was developed for the generation of a range of glycosylated derivatives of anthracyclines. Co-cultivation of Streptomyces venezuelae mutants producing two anthracycline aglycones with eight different nucleotide deoxysugar-producing S. venezuelae mutants that co-express a substrate-flexible glycosyltransferase led to the generation of sixteen aklavinone or ε-rhodomycinone glycosides containing diverse deoxysugar moieties, seven of which are new...
February 13, 2017: ACS Combinatorial Science
https://www.readbyqxmd.com/read/28187655/-i-digitonthophagus-i-i-gazella-i-auctorum-an-unfortunate-case-of-mistaken-identity-for-a-widely-introduced-species-coleoptera-scarabaeidae-scarabaeinae-onthophagini
#5
François Génier, Adrian L V Davis
At risk of committing entomological heresy, we question the identity of a dung-burying beetle species that originates from Africa and has been introduced first into Hawaii and subsequently to Australasia, North America, and South America (Fincher 1986; Edwards 2007; Noriega et al. 2010) for pasture improvement and biological control of dung-breeding flies (Waterhouse 1974; Bornemissza 1979).  Under the name Onthophagus gazella (Fabricius 1787), it was the first species selected for introduction into Australia by the CSIRO Dung Beetle Project (Bornemissza 1976; Edwards 2007)...
January 19, 2017: Zootaxa
https://www.readbyqxmd.com/read/28187640/a-revision-of-the-cis-andean-species-of-the-genus-i-brycon-i-m%C3%A3-ller-amp-troschel-characiformes-characidae
#6
Flávio C T Lima
A revision of the cis-andean species of Brycon, with the exception of the Brycon pesu species-complex, is presented. Twenty-one Brycon species (including B. pesu) are recognized from cis-andean river systems: Brycon stolzmanni Steindachner, from the upper Río Marañon basin, Peru; Brycon coxeyi Fowler, from the Río Marañon basin, Ecuador and Peru; Brycon polylepis Moscó Morales, from the Lago de Maracaibo, Río Orinoco, upper rio Amazonas, and rio Tocantins basins, Venezuela, Colombia, Peru, and Brazil; Brycon coquenani Steindachner, from the upper Río Caroni, Río Orinoco basin, Venezuela; Brycon insignis Steindachner, from the rio Paraíba do Sul and small adjacent coastal river basins of eastern Brazil; Brycon vermelha Lima & Castro, endemic from the rio Mucuri basin, eastern Brazil; Brycon howesi new species, endemic from the rio Jequitinhonha basin, Brazil; Brycon dulcis new species, endemic from the rio Doce basin, eastern Brazil; Brycon ferox Steindachner, from several small coastal river systems, including the rio Mucuri basin in eastern Brazil; Brycon vonoi new species, from the rio Pardo basin and apparently also from a adjacent river system, the rio Una, in eastern Brazil; Brycon opalinus (Cuvier), from the headwaters of the rio Paraíba do Sul and rio Doce basins, eastern Brazil; Brycon nattereri Günther, from the headwaters of the upper rio Paraná, rio São Francisco, and upper rio Tocantins basins, Brazil; Brycon orthotaenia Günther, endemic from the rio São Francisco basin, Brazil; Brycon orbignyanus (Valenciennes), from the rio Paraná and rio Uruguai basins, Brazil, Paraguay, Argentina, and Uruguay; Brycon hilarii (Valenciennes), from the rio Paraguai, middle rio Paraná, and upper rio Amazonas basins, Brazil, Paraguay, Argentina, Peru, and Ecuador; Brycon whitei Myers & Weitzman, from the Río Orinoco basin in Colombia and Venezuela; Brycon amazonicus (Agassiz), from the Rio Amazonas and Río Orinoco basins, Brazil, Peru, Colombia, Bolivia, Venezuela, and Guyana; Brycon gouldingi Lima, endemic from the rio Tocantins basin, Brazil; Brycon melanopterus (Cope), from the western and central rio Amazonas basin, Brazil, Peru, Ecuador, and Colombia; and Brycon falcatus Müller & Troschel, widespread in the the rio Amazonas and Río Orinoco basins, and several guyanese river systems, in Brazil, Venezuela, Colombia, Peru, Bolivia, Guyana, Suriname, and French Guiana...
January 22, 2017: Zootaxa
https://www.readbyqxmd.com/read/28187559/the-superficial-ant-a-revision-of-the-neotropical-ant-mimicking-spider-genus-i-myrmecium-i-latreille-1824-araneae-corinnidae-castianeirinae
#7
David F Candiani, Alexandre B Bonaldo
The ant-mimiking spider genus Myrmecium Latreille, 1824 is revised, including 38 species, all herein diagnosed, described and illustrated. The following synonymies are proposed: Myrmecium aurantiacum Mello-Leitão, 1941 syn. nov. with M. camponotoides Mello-Leitão, 1932; M. gounellei Simon, 1896 syn. nov. and M. obscurum Keyserling, 1891 syn. nov. with M. latreillei Lucas, 1857; M. itatiaiae Mello-Leitão, 1932 syn. nov. and M. vertebratum Walckenaer, 1837 syn. nov. with M. rufum Latreille, 1824. Myrmecium bonaerense Holmberg, 1881 is considered as species inquirenda...
February 7, 2017: Zootaxa
https://www.readbyqxmd.com/read/28183247/streptomyces-as-overexpression-system-for-heterologous-production-of-an-antimicrobial-peptide
#8
Marisol Roldán-Tapia, Jozef Anné, Ana Gisela Reyes, Ulises Carrasco, Cesar Millán-Pacheco, Javier Barrios-González, Armando Mejía
Defense mechanisms of plants against phytopathogens include cationic antimicrobial peptides (CAPs). The broad-spectrum activity of these peptides has been evaluated previously against different phytopathogens. Their lack of toxicity for plants and animals is a promising feature for pest control. Although, some attempts have been made previously in order to increase their heterologous expressions, the employed strategies have so far proven to be ineffective. Low production yield and elevated costs are the obstacles to overcome...
February 8, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28168124/geography-shapes-the-phylogeny-of-frailejones-espeletiinae-cuatrec-asteraceae-a-remarkable-example-of-recent-rapid-radiation-in-sky-islands
#9
Mauricio Diazgranados, Janet C Barber
BACKGROUND: The páramo ecosystem, located above the timberline in the tropical Andes, has been the setting for some of the most dramatic plant radiations, and it is one of the world's fastest evolving and most diverse high-altitude ecosystems. Today 144+ species of frailejones (subtribe Espeletiinae Cuatrec., Asteraceae) dominate the páramo. Frailejones have intrigued naturalists and botanists, not just for their appealing beauty and impressive morphological diversity, but also for their remarkable adaptations to the extremely harsh environmental conditions of the páramo...
2017: PeerJ
https://www.readbyqxmd.com/read/28167595/oropouche-virus-clinical-epidemiological-and-molecular-aspects-of-a-neglected-orthobunyavirus
#10
REVIEW
Jorge Fernando Travassos da Rosa, William Marciel de Souza, Francisco de Paula Pinheiro, Mário Luiz Figueiredo, Jedson Ferreira Cardoso, Gustavo Olszanski Acrani, Márcio Roberto Teixeira Nunes
Oropouche virus (OROV) is an important cause of arboviral illness in Latin American countries, more specifically in the Amazon region of Brazil, Venezuela and Peru, as well as in other countries such as Panama. In the past decades, the clinical, epidemiological, pathological, and molecular aspects of OROV have been published and provide the basis for a better understanding of this important human pathogen. Here, we describe the milestones in a comprehensive review of OROV epidemiology, pathogenesis, and molecular biology, including a description of the first isolation of the virus, the outbreaks during the past six decades, clinical aspects of OROV infection, diagnostic methods, genome and genetic traits, evolution, and viral dispersal...
February 6, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28166292/fall-armyworm-migration-across-the-lesser-antilles-and-the-potential-for-genetic-exchanges-between-north-and-south-american-populations
#11
Rodney N Nagoshi, Shelby Fleischer, Robert L Meagher, Mirian Hay-Roe, Ayub Khan, M Gabriela Murúa, Pierre Silvie, Clorinda Vergara, John Westbrook
The fall armyworm, Spodoptera frugiperda (J. E. Smith)(Lepidoptera: Noctuidae), is an important agricultural pest of the Western Hemisphere noted for its broad host range, long distance flight capabilities, and a propensity to develop resistance to pesticides that includes a subset of those used in genetically modified corn varieties. These characteristics exacerbate the threat fall armyworm poses to agriculture, with the potential that a resistance trait arising in one geographical location could rapidly disseminate throughout the hemisphere...
2017: PloS One
https://www.readbyqxmd.com/read/28148228/health-economic-evaluation-of-human-papillomavirus-vaccines-in-women-from-venezuela-by-a-lifetime-markov-cohort-model
#12
Ariel Esteban Bardach, Osvaldo Ulises Garay, María Calderón, Andrés Pichón-Riviére, Federico Augustovski, Sebastián García Martí, Paula Cortiñas, Marino Gonzalez, Laura T Naranjo, Jorge Alberto Gomez, Joaquín Enzo Caporale
BACKGROUND: Cervical cancer (CC) and genital warts (GW) are a significant public health issue in Venezuela. Our objective was to assess the cost-effectiveness of the two available vaccines, bivalent and quadrivalent, against Human Papillomavirus (HPV) in Venezuelan girls in order to inform decision-makers. METHODS: A previously published Markov cohort model, informed by the best available evidence, was adapted to the Venezuelan context to evaluate the effects of vaccination on health and healthcare costs from the perspective of the healthcare payer in an 11-year-old girls cohort of 264,489...
February 2, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28139884/streptomyces-venezuelae-tx-tl-a-next-generation-cell-free-synthetic-biology-tool
#13
Simon J Moore, Hung-En Lai, Hannah Needham, Karen M Polizzi, Paul S Freemont
Streptomyces venezuelae is a promising chassis in synthetic biology for fine chemical and secondary metabolite pathway engineering. The potential of S. venezuelae could be further realized by expanding its capability with the introduction of its own in vitro transcription-translation (TX-TL) system. TX-TL is a fast and expanding technology for bottom-up design of complex gene expression tools, biosensors and protein manufacturing. Herein, we introduce a S. venezuelae TX-TL platform by reporting a streamlined protocol for cell-extract preparation, demonstrating high-yield synthesis of a codon-optimized sfGFP reporter and the prototyping of a synthetic tetracycline-inducible promoter in S...
January 31, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28139222/comparison-of-trends-in-mortality-from-coronary-heart-and-cerebrovascular-diseases-in-north-and-south-america-1980-to-2013
#14
Eleonora Pagan, Liliane Chatenoud, Teresa Rodriguez, Cristina Bosetti, Fabio Levi, Matteo Malvezzi, Carlo La Vecchia, Eva Negri, Paola Bertuccio
Until the past century, mortality trends from coronary heart disease (CHD) and cerebrovascular disease (CVD) were less favorable in Latin than in North America. We calculated age-standardized mortality rates using data from the World Health Organization database over the period 1980 to 2013. To identify significant changes in trends, we performed joinpoint analysis. Since the early 2000's, CHD mortality rates decreased by about 35% in the USA and Canada in both genders; similar decreases were observed in some Latin American countries (i...
December 18, 2016: American Journal of Cardiology
https://www.readbyqxmd.com/read/28114342/spatial-analysis-of-dengue-seroprevalence-and-modeling-of-transmission-risk-factors-in-a-dengue-hyperendemic-city-of-venezuela
#15
Maria F Vincenti-Gonzalez, María-Eugenia Grillet, Zoraida I Velasco-Salas, Erley F Lizarazo, Manuel A Amarista, Gloria M Sierra, Guillermo Comach, Adriana Tami
BACKGROUND: Dengue virus (DENV) transmission is spatially heterogeneous. Hence, to stratify dengue prevalence in space may be an efficacious strategy to target surveillance and control efforts in a cost-effective manner particularly in Venezuela where dengue is hyperendemic and public health resources are scarce. Here, we determine hot spots of dengue seroprevalence and the risk factors associated with these clusters using local spatial statistics and a regression modeling approach. METHODOLOGY/PRINCIPAL FINDINGS: From August 2010 to January 2011, a community-based cross-sectional study of 2012 individuals in 840 households was performed in high incidence neighborhoods of a dengue hyperendemic city in Venezuela...
January 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28112335/-clonal-relationship-and-detection-of-blakpc-gene-in-strains-of-klebsiella-pneumoniae-resistant-to-carbapenems-at-a-hospital-in-venezuela
#16
Dianny Martínez, Yasmina Araque, Hectorina Roduifo, Luisa Caña, José García, Diorelis Gonzáiez, Lucy Rodríguez, Marcos De Donato
In order to study the clonal relationship and blaKPC gene detection in clinical isolates of Klebsiella pneumoniae resistant to carbapenems, we analyzed 22 clinical isolates of K. pneumoniae with resistance to imipenem and/ or meropenem, isolated in the laboratory of bacteriology at the University Hospital "Antonio Patricio de Alcalá" (HUAPA) from the Cumana city, Sucre state, Venezuela, for a period of five consecutive years. Susceptibility to different antimicrobials was determined, and the presence of carbapenemases was detected by modified Hodge method, phenyl boronic acid synergy and combination discs...
October 2016: Revista Chilena de Infectología: órgano Oficial de la Sociedad Chilena de Infectología
https://www.readbyqxmd.com/read/28107501/childhood-vaccine-acceptance-and-refusal-among-warao-amerindian-caregivers-in-venezuela-a-qualitative-approach
#17
Jochem Burghouts, Berenice Del Nogal, Angimar Uriepero, Peter W M Hermans, Jacobus H de Waard, Lilly M Verhagen
OBJECTIVES: Acceptance of childhood vaccination varies between societies, affecting worldwide vaccination coverage. Low coverage rates are common in indigenous populations where parents often choose not to vaccinate their children. We aimed to gain insight into reasons for vaccine acceptance or rejection among Warao Amerindians in Venezuela. METHODS: Based on records of vaccine acceptance or refusal, in-depth interviews with 20 vaccine-accepting and 11 vaccine-declining caregivers were performed...
2017: PloS One
https://www.readbyqxmd.com/read/28105677/lesser-devil-rays-mobula-cf-hypostoma-from-venezuela-are-almost-twice-their-previously-reported-maximum-size-and-may-be-a-new-sub-species
#18
N R Ehemann, L V González-González, A W Trites
Three rays opportunistically obtained near Margarita Island, Venezuela, were identified as lesser devil rays Mobula cf. hypostoma, but their disc widths were between 207 and 230 cm, which is almost double the reported maximum disc width of 120 cm for this species. These morphometric data suggest that lesser devil rays are either larger than previously recognized or that these specimens belong to an unknown sub-species of Mobula in the Caribbean Sea. Better data are needed to describe the distribution, phenotypic variation and population structure of this poorly known species...
January 20, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28096455/multicenter-prospective-study-on-device-associated-infection-rates-and-bacterial-resistance-in-intensive-care-units-of-venezuela-international-nosocomial-infection-control-consortium-inicc-findings
#19
Gabriel D Empaire, Maria E Guzman Siritt, Victor D Rosenthal, Fernando Pérez, Yvis Ruiz, Claudia Díaz, Gabriela Di Silvestre, Evelyn Salinas, Nelva Orozco
BACKGROUND: Device-associated healthcare-acquired infections (DA-HAI) pose a threat to patient safety in the intensive care unit (ICU). METHODS: A DA-HAI surveillance study was conducted by the International Nosocomial Infection Control Consortium (INICC) in two adult medical/surgical ICUs at two hospitals in Caracas, Venezuela, in different periods from March 2008 to April 2015, using the US Centers for Disease Control and Prevention's National Healthcare Safety Network (CDC/NHSN) definitions and criteria, and INICC methods...
January 2017: International Health
https://www.readbyqxmd.com/read/28095443/morphologic-and-molecular-characterization-of-a-strain-of-zika-virus-imported-into-guangdong-china
#20
Shufen Li, Yongxia Shi, Kui Zheng, Jun Dai, Xiaobo Li, Shuai Yuan, Ling Chen, Jicheng Huang
The recent outbreaks of Zika virus (ZIKV) disease have caused worldwide concerns. Guangdong province is one of the commercial centers in China and communicates frequently with the epidemic areas. To date, 65.2% of the ZIKV infection cases in China were imported via port of entry in Guangdong. The continuous surveillance of imported cases is crucial for the prevention and control of potential ZIKV infection outbreak in China. In this study, a strain of ZIKV was isolated from the serum of a 6-year-old child returning from Venezuela...
2017: PloS One
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