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Sapiano MRP, Brown CW, Schollaert Uz S, Vargas M. Establishing a global climatology of marine phytoplankton phenological characteristics. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2012jc007958] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ruiz J, Silva W, Tinco C, Pons M, del Valle L, Gomez C, Bazan J, Vargas M, Champin D, Mendoza JDV. Etiological and molecular diagnostic of Carrion's disease in patients from Cajamarca - Perú. Int J Infect Dis 2012. [DOI: 10.1016/j.ijid.2012.05.889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Vargas M, Servillo G, Striano P. Serum lactate dehydrogenase as early marker of posterior reversible encephalopathy syndrome: keep your eyes open. Anaesth Intensive Care 2012; 40:570-571. [PMID: 22577937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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Bonilla J, Atarés L, Vargas M, Chiralt A. Edible films and coatings to prevent the detrimental effect of oxygen on food quality: Possibilities and limitations. J FOOD ENG 2012. [DOI: 10.1016/j.jfoodeng.2011.05.034] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Vargas M, Loyola C, Zapata N, Rivera V, Secor G, Bolton M, France A. First Report of Root Rot of Chicory Caused by Phytophthora cryptogea in Chile. PLANT DISEASE 2012; 96:591. [PMID: 30727403 DOI: 10.1094/pdis-03-11-0245] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Chicory (Cichorium intybus L. var sativum Bisch.), a relatively new high-value crop in Chile, was introduced for commercial production of inulin. Inulins are polysaccharides extracted from chicory tap roots that are used in processed foods because of their beneficial gastrointestinal properties. Approximately 3,000 ha of chicory are grown for local processing in the BioBio Region near Chillan in south central Chile. Recently, a severe rot of 1 to 3% of mature roots in the field and after harvest has been observed in most fields, which caused yield and quality losses. Typical symptoms include a brown discoloration and a soft, watery decay of the root. Tissue pieces from symptomatic roots were placed on water agar and clarified V8 juice agar medium amended with antibiotics (1) for isolation of the causal pathogen. A Phytopthora sp. had been consistently isolated from root lesions, and axenic cultures were obtained using single-hypha transfers. The species was provisionally identified as Phytopthora cryptogea (Pethybridge and Lafferty, 1919) on the basis of morphological and cultural characteristics (1). Mycelia grew between 5 and 30°C with optimal growth at 20 to 25°C and no growth at 35°C. All isolates produced hyphal swellings and nonpapillate, persistent, internally proliferating, and ovoid to obpyriform sporangia with mean dimensions of 45 × 31 μm in sterile soil extract. The isolates were of A1 mating type because they produced oospores only when paired with reference isolates of P. cinnamomi A2 on clarified V8 juice agar amended with thiamine, tryptophan, and β-sitosterol (1) after 20 days at 20°C in the dark. On the basis of morphological and sequence data from cytochrome c oxidase subunit 1 and 2, internal transcribed spacer 2, and β-tubulin (GenBank Accession Nos. JQ037796 to JQ037798, respectively), the pathogen was identified as P. cryptogea. Pathogenicity tests were conducted using three isolates of P. cryptogea by placing a 7-mm-diameter disk from a 1-week-old V8 agar culture on 10 wounded and nonwounded healthy chicory roots (2). Control roots were mock inoculated with agar plugs. The inoculated roots were incubated at 20°C in a moist chamber. Root rot symptoms, identical to those observed both in field and storage, developed after 4 to 6 days only on wounded sites inoculated with the pathogen, and P. cryptogea was reisolated from these inoculated plants. Mock-inoculated roots remained healthy. This experiment was completed twice and similar results were obtained. To our knowledge, this is the first report of Phytophthora root rot of chicory caused by P. cryptogea in Chile. References: (1) D. C. Erwin and O. K. Ribeiro. Phytophthora Diseases Worldwide. The American Phytopathological Society, St. Paul, MN, 1996. (2) M. E. Stanghellini and W. C. Kronland. Plant Dis. 66:262, 1982.
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Hernández-Cuevas NA, Hernandez-Rivas R, Sosa-Peinado A, Rojo-Domínguez A, Vargas M. Identification and evaluation of inhibitors of the EhGEF1 protein from Entamoeba histolytica. J Mol Recognit 2012; 24:935-44. [PMID: 22038800 DOI: 10.1002/jmr.1137] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The Dbl family of guanine nucleotide exchange factors (GEFs) is made up of a vast array of members that participate in the activation of the Rho family of small GTPases. Dbl-family proteins promote the exchange of guanosine diphosphate/guanosine triphosphate (GDP/GTP) in their target molecules, resulting in the activation of a variety of signaling pathways involved in diverse cellular events, such as actin-cytoskeleton remodeling, cellular invasion, cell movement, and other functions. It has been reported that members of the Dbl family have important roles in several cellular events in Entamoeba histolytica. These include activation of the actin cytoskeleton, cytokinesis, capping, uroid formation, cellular proliferation, erythrophagocytosis, cell migration, and chemotaxis. Here, we report the identification and testing of inhibitors of the E. histolytica guanine nucleotide exchange factor 1 (EhGEF1) protein (the research compounds 2BYRF, 2BY05, 2BYT6, 2BYLX, and 2BYPD), which decreased the in vitro ability of the protein to exchange GDP/GTP at its target GTPases, EhRacG and EhRho1, by 14.9-85.2%. Interestingly, the drug 1,1'-(1,2-phenylene)-bis-(1H-pyrrole-2,5-dione), which completely inhibits the GEF activity of the Trio protein in human cells, decreases the GEF activity of the EhGEF1 protein on the EhRacG and EhRho1 GTPases by 55.7% and 3.2%, respectively. The identification and evaluation of such inhibitors opens up the possibility of obtaining a new pharmacological tool to study the function of amoeba GEF proteins, their roles in various Rho GTPase-mediated signaling pathways, and the repercussions of modulating their activities with respect to several mechanisms related to E. histolytica pathogenesis.
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Alvarez XA, Cacabelos R, Sampedro C, Couceiro V, Aleixandre M, Vargas M, Linares C, Granizo E, García-Fantini M, Baurecht W, Doppler E, Moessler H. Combination treatment in Alzheimer's disease: results of a randomized, controlled trial with cerebrolysin and donepezil. Curr Alzheimer Res 2011; 8:583-91. [PMID: 21679156 DOI: 10.2174/156720511796391863] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2010] [Accepted: 04/14/2011] [Indexed: 11/22/2022]
Abstract
Treatment with neurotrophic agents might enhance and/or prolong the effects of cholinesterase inhibitors (ChEIs) in Alzheimer's disease (AD). We compared the safety and efficacy of the neurotrophic compound Cerebrolysin (10 ml; n=64), donepezil (10 mg; n=66) and a combination of both treatments (n=67) in mild-to-moderate (mini-mental state examination-MMSE score 12-25) probable AD patients enrolled in a randomized, double-blind trial. Primary endpoints were global outcome (Clinician's Interview-Based Impression of Change plus caregiver input; CIBIC+) and cognition (change from baseline in AD Assessment Scale-cognitive subscale+; ADAS-cog+) at week 28. Changes in functioning (AD Cooperative Study-Activities of Daily Living scale, ADCS-ADL) and behaviour (Neuropsychiatric Inventory, NPI) were secondary endpoints. Treatment effects in cognitive, functional and behavioral domains showed no significant group differences; whereas improvements in global outcome favored Cerebrolysin and the combination therapy. Cognitive performance improved in all treatment groups (mean±SD for Cerebrolysin: -1.7±7.5; donepezil: -1.2±6.1; combination: -2.3±6.0) with best scores in the combined therapy group at all study visits. Cerebrolysin was as effective as donepezil, and the combination of neurotrophic (Cerebrolysin) and cholinergic (donepezil) treatment was safe in mild-to-moderate AD. The convenience of exploring long-term synergistic effects of this combined therapy is suggested.
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Dorrer C, Wei SKH, Leung P, Vargas M, Wegman K, Boulé J, Zhao Z, Marshall KL, Chen SH. High-damage-threshold static laser beam shaping using optically patterned liquid-crystal devices. OPTICS LETTERS 2011; 36:4035-4037. [PMID: 22002377 DOI: 10.1364/ol.36.004035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Beam shaping of coherent laser beams is demonstrated using liquid crystal (LC) cells with optically patterned pixels. The twist angle of a nematic LC is locally set to either 0 or 90° by an alignment layer prepared via exposure to polarized UV light. The two distinct pixel types induce either no polarization rotation or a 90° polarization rotation, respectively, on a linearly polarized optical field. An LC device placed between polarizers functions as a binary transmission beam shaper with a highly improved damage threshold compared to metal beam shapers. Using a coumarin-based photoalignment layer, various devices have been fabricated and tested, with a measured single-shot nanosecond damage threshold higher than 30 J/cm2.
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Vargas M, Guisasola A, Artigues A, Casas C, Baeza J. Comparison of a nitrite-based anaerobic–anoxic EBPR system with propionate or acetate as electron donors. Process Biochem 2011. [DOI: 10.1016/j.procbio.2010.11.018] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Toral S, Gregor D, Vargas M, Barrero F, Cortes F. Distributed urban traffic applications based on CORBA event services. INTERNATIONAL JOURNAL OF SPACE-BASED AND SITUATED COMPUTING 2011. [DOI: 10.1504/ijssc.2011.039110] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Segura A, Castillo M, Núñez V, Yarlequé A, Gonçalves L, Villalta M, Bonilla C, Herrera M, Vargas M, Fernández M, Yano M, Araújo H, Boller M, León P, Tintaya B, Sano-Martins I, Gómez A, Fernández G, Geoghegan P, Higashi H, León G, Gutiérrez J. Preclinical assessment of the neutralizing capacity of antivenoms produced in six Latin American countries against medically-relevant Bothrops snake venoms. Toxicon 2010; 56:980-9. [DOI: 10.1016/j.toxicon.2010.07.001] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2010] [Revised: 07/01/2010] [Accepted: 07/01/2010] [Indexed: 10/19/2022]
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Campos-Parra A, Hernández-Cuevas N, Hernandez-Rivas R, Vargas M. EhNCABP166: A nucleocytoplasmic actin-binding protein from Entamoeba histolytica. Mol Biochem Parasitol 2010; 172:19-30. [DOI: 10.1016/j.molbiopara.2010.03.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2009] [Revised: 03/09/2010] [Accepted: 03/15/2010] [Indexed: 01/06/2023]
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Childers SE, Vargas M, Noll KM. Improved Methods for Cultivation of the Extremely Thermophilic Bacterium Thermotoga neapolitana. Appl Environ Microbiol 2010; 58:3949-53. [PMID: 16348824 PMCID: PMC183209 DOI: 10.1128/aem.58.12.3949-3953.1992] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Growth medium components and cultivation conditions for the extremely thermophilic bacterium Thermotoga neapolitana were optimized. A defined marine salts medium was formulated. Trace amounts of iron stimulated growth of T. neapolitana, while zinc inhibited growth at concentrations exceeding 11.1 muM. Other trace metals had no effect on its growth. Of the vitamins tested, only biotin was required for optimal growth. A defined mineral medium containing 5 g of carbohydrates per liter as the carbon source and 0.5 g of cysteine per liter as the sulfur source and reductant supported growth. Growth was stimulated by inclusion of vitamin-free Casamino Acids. Elemental sulfur, cystine, and dimethyl disulfide in the growth medium enhanced growth. Elemental sulfur and cystine relieved growth inhibition by hydrogen. T. neapolitana formed colonies in 2 days on plates of complex medium solidified with gellan gum and in 4 days on defined medium. The efficiency of plating was determined when growing cultures were sampled both aerobically and anaerobically and plated under aerobic and anaerobic conditions. Mean plating efficiencies were improved by sampling the growing cultures under strictly anaerobic conditions. Little or no improvement was obtained by inoculating plates inside an anaerobic chamber. Plating efficiencies of approximately 80% were obtained. Polycarbonate jars with aluminum lids withstood repeated incubation at 77 degrees C without significant deterioration of the anaerobic seal and provided the most consistent results.
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Gordillo G, Santos FS, Torres J, Velazquez E, Ramon G, Garcia R, Vargas M. Epidemiological, clinical and zoonotic evidences for the existence of Lyme disease in Central of Mexico. Int J Infect Dis 2010. [DOI: 10.1016/j.ijid.2010.02.462] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Lloret-Sanchez L, Castillo A, Mazari-Hiriart M, Vargas M, López-Vidal Y. Characterization of nontuberculous mycobacteria isolated of potable water distribution system and wastewater of Mexico City Metropolitan Area. Int J Infect Dis 2010. [DOI: 10.1016/j.ijid.2010.02.1772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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66
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Pendse N, Wissmeyer M, Altrichter S, Vargas M, Delavelle J, Viallon M, Federspiel A, Seeck M, Schaller K, Lövblad K. Interictal arterial spin-labeling MRI perfusion in intractable epilepsy. J Neuroradiol 2010; 37:60-3. [DOI: 10.1016/j.neurad.2009.05.006] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2009] [Accepted: 05/22/2009] [Indexed: 11/15/2022]
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Pedroni E, Garcia M, Espinola V, Guerrero A, Gonzalez C, Olea A, Calvo M, Martorell B, Winkler M, Carrasco M, Vergara J, Ulloa J, Carrazana A, Mujica O, Villarroel J, Labrana M, Vargas M, Gonzalez P, Caceres L, Zamorano C, Momberg R, Munoz G, Rocco J, Bosque V, Gallardo A, Elgueta J, Vega J. Outbreak of 2009 pandemic influenza A(H1N1), Los Lagos, Chile, April-June 2009. ACTA ACUST UNITED AC 2010; 15. [PMID: 20067745 DOI: 10.2807/ese.15.01.19456-en] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
On 17 May 2009, the first two cases of 2009 pandemic influenza A(H1N1) were confirmed in the Metropolitan region (Santiago, Chile). On 6 June 2009, Chile reported 500 confirmed cases, seven severe and two fatal. Because six of the severe cases and the two deaths occurred in the region of Los Lagos in southern Chile, a retrospective study was conducted using data on emergency room visits as well as laboratory viral surveillance, during the period from 1 April to 31 May, in order to establish the date of the beginning of the outbreak. From 1 to 27 June, data were collected in real time, to establish the real magnitude of the outbreak, describe its transmission, clinical severity and secondary attack rates. Confirmed cases, their household contacts and healthcare workers were interviewed. This analysis showed that the outbreak in Los Lagos started on 28 April. By 27 June, a total of 14.559 clinical cases were identified, affecting mostly 5-19 year-olds. The effective reproduction number during the initial phase (20 days) was 1.8 (1.6-2.0). Of the 190 confirmed cases with severe acute respiratory infection, 71 (37.4%) presented a risk condition or underlying illness.
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Mardones F, Zemelman V, Sazunic I, Morales C, Palma K, Vargas M. [CD1a+ Langerhans cells in the peritumoral epidermis of basal cell carcinoma]. ACTAS DERMO-SIFILIOGRAFICAS 2010; 100:700-5. [PMID: 19775548 DOI: 10.1016/s0001-7310(09)72283-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Basal cell carcinoma (BCC) is a common malignant tumor and its incidence has risen in recent decades. Research has shown the relationship between ultraviolet (UV) radiation, the skin immune system, and BCC. The role of Langerhans cells (LC) in the immune response to tumors has prompted research into LC density and morphology in response to UV radiation and BCC. However, the data are inconsistent due to differences in research methodology. OBJECTIVE. To study the density and morphology of LCs in the peritumoral epidermis of BCC using immunohistochemistry and image processing software and compare the results with those from the epidermis overlying the tumor. MATERIAL AND METHODS Twelve samples from patients with BCC were prepared with a CD1a stain. Areas of epidermis overlying and adjacent to the tumor were defined using light microscopy and the Image J image processing software. The LCs in each area were counted and the cell densities were calculated and compared. Morphological features of LCs were also evaluated in each epidermal areas. RESULTS The results showed a lower density of LCs in the epidermis overlying the tumor than in the peritumoral epidermis (p < 0.05). There were also differences in the size, shape, and dendritic pattern of the LCs between the epidermal areas. CONCLUSIONS The lower density and fewer morphological changes of LCs in the epidermis overlying BCC may give rise to alterations in the immune response to BCC. Digital image analysis is a reliable method for the morphometric evaluation of LCs.
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Koch E, Romero T, Romero CX, Akel C, Manríquez L, Paredes M, Román C, Taylor A, Vargas M, Kirschbaum A. Impact of education, income and chronic disease risk factors on mortality of adults: does 'a pauper-rich paradox' exist in Latin American societies? Public Health 2009; 124:39-48. [PMID: 20036407 DOI: 10.1016/j.puhe.2009.11.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2009] [Revised: 10/27/2009] [Accepted: 11/18/2009] [Indexed: 11/15/2022]
Abstract
OBJECTIVES To test the hypothesis that an inverse association exists between socio-economic position and all-cause mortality in a developing country in Latin America. STUDY DESIGN Prospective cohort study carried out in Chile using data from a simple random sample of 920 apparently healthy subjects (weighted population 11,600 aged 30-89 years) followed for 8 years. METHODS Education level (0-8 years, 9-12 years and > or = 13 years) and income quartiles were established at the outset of the study, along with behavioural and biological risk factors for chronic diseases: smoking, alcohol use, obesity, diabetes, hypertension, lipids and family history of death by cardiovascular disease. Relative risks of all-cause mortality were estimated using age-adjusted Cox regression models. RESULTS During the follow-up period, 46 deaths were observed. Adjusting for age, gender, and behavioural and biological risk factors, the mortality risk for increasing categories of education after controlling for income was 1.0, 0.76 and 0.33 (P for trend<0.01). In contrast, the relative risk for increasing levels of income after controlling for education was 1.0, 0.98, 1.33 and 1.17 (P for trend=0.07). CONCLUSION While education level had a protective effect on mortality risk of Chilean adults, income had a slightly unfavourable effect on survival. This finding is described as suggestive of a 'pauper-rich paradox', since the higher income quantiles in this study correspond with the lower income levels in most developed countries. Nevertheless, due to the small number of deaths, additional research is required to assess the validity of these findings.
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Gordillo-Pérez G, Vargas M, Solórzano-Santos F, Rivera A, Polaco OJ, Alvarado L, Muñóz O, Torres J. Demonstration of Borrelia burgdorferi sensu stricto infection in ticks from the northeast of Mexico. Clin Microbiol Infect 2009; 15:496-8. [PMID: 19489926 DOI: 10.1111/j.1469-0691.2009.02776.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Borrelia burgdorferisensu lato infection has been confirmed in clinical cases in the northeast of Mexico; however, the bacterium has not been identified as infecting the tick vector Ixodes, Amblyomma and Dermacentor ticks were collected from mammals and plants in northeastern Mexico and examined for Borrelia. Eighteen of 214 ticks were PCR-positive for the fla and 16S rRNA genes and 15 for the ospA gene. Southern blotting with a fla probe and sequencing of ospA genes confirmed infection with B. burgdorferi sensu stricto. These findings, together with reports of indigenous cases, fulfil the criteria that allow northeastern Mexico to be considered as a zone endemic for Lyme disease.
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Vargas M, Casas C, Baeza J. Maintenance of phosphorus removal in an EBPR system under permanent aerobic conditions using propionate. Biochem Eng J 2009. [DOI: 10.1016/j.bej.2008.10.013] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Carvalho A, Soares I, Belo Pereira M, Vargas M, Moreira N, Pinto P. Vince – a case study. ADVANCES IN SCIENCE AND RESEARCH 2009. [DOI: 10.5194/asr-2-145-2008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Abstract. Vince was an unusual hurricane that developed over the North Atlantic Ocean in an unexpected area, on October 2005. In this work, the authors analyze its background and genesis over the ocean, making use of satellite imagery and numerical models. The impacts on sea state are investigated both numerically and observationally. Landfall over the Iberian Peninsula is monitored with surface observations and a radar system at Algarve (Portugal).
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Hernández-Cuevas NA, Campos-Parra AD, Almaraz-Barrera MDJ, Aguilar-Rojas A, González-de la Rosa CH, Sosa-Peinado A, Hernández-Rivas R, Rojo-Domínguez A, Vargas M. Entamoeba histolyticaEhGEF1 structure and mutational analysis: New specific residues critical for function. Mol Biochem Parasitol 2008; 164:118-25. [PMID: 19135094 DOI: 10.1016/j.molbiopara.2008.12.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2008] [Revised: 12/02/2008] [Accepted: 12/10/2008] [Indexed: 01/12/2023]
Abstract
This paper reports the EhGEF1-EhRacG and EhGEF1-EhRho1 molecular complexes from Entamoeba histolytica. The not conserved amino acids Gln201,Tyr299, Gln302, Lys312, Asn313, Phe314 and Ile324 were localized, by means of an in silico computational analysis, at the interface of the exposed face from the DH domain of EhGEF1, which are important to establish the contact with its target GTPases EhRacG and EhRho1. Functional studies of nucleotide exchange of Phe314Ala mutant showed a decrement of 80% on EhRacG GTPase; in contrast the Ile324Ala mutant exhibited a reduction of 77%, specifically on EhRho1; meanwhile the Gln302Ala mutant showed a reduction of approximately 50% on the exchange activity for both GTPases. Moreover, the functional studies of the protein EhGEF1 mutants in the conserved residues Thr194Ala, Asn366Ala and Glu367Ala indicated that contrary to what has been reported for other systems, the mutation of these residues did not alter considerably its catalytic activity.
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Suarez R, Jimenez M, Romo R, Mendez V, Vargas M, Fernandez-Sanchez M. Down's syndrome risk prevalence related to tobacco smoking in ART patients. Fertil Steril 2008. [DOI: 10.1016/j.fertnstert.2008.07.805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Castillo Pineda JCDLC, Figueredo Grijalva R, Dugloszewski C, Díaz Reynoso JASR, Spolidoro Noroña JV, Matos A, Carrasco F, Chirife G, Vergara A, Moya Rodríguez J, Loyola G, Alvarez A, Barozzi C, Vargas M, García de Lorenzo A. [The Cancun Declaration: the Cancun International Declaration on the Right at the hospital]. NUTR HOSP 2008; 23:413-417. [PMID: 19160890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023] Open
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