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International Microbiology: the Official Journal of the Spanish Society for Microbiology

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https://www.readbyqxmd.com/read/28504818/characterization-of-escherichia-coli-clinical-isolates-causing-urinary-tract-infections-in-the-community-of-chilpancingo-mexico
#1
Jesús A Hernández-Vergara, Verónica I Martínez-Santos, Romina B Radilla-Vázquez, Jesús Silva-Sánchez, Amalia Vences-Velásquez, Natividad Castro-Alarcón
Escherichia coli is the main cause of urinary tract infections (UTI) in ambulatory patients, especially strains belonging to the B2 phylogenetic group and ST131 clonal group. Antibiotic treatment is usually administered empirically; however, it is not always effective due to bacterial multidrug resistance and the production of extended spectrum β-lactamases (ESBLs). The aim of this study was to characterize E. coli clinical isolates from patients with UTI in a community of the State of Guerrero, Mexico. From January to August 2014, 134 clinical isolates of E...
December 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/28504817/biofilm-formation-in-catheter-related-infections-by-panton-valentine-leukocidin-producing-staphylococcus-aureus
#2
Giorgio Silva-Santana, Kátia C Lenzi-Almeida, Vânia G S Lopes, Fábio Aguiar-Alves
The use of invasive techniques, such as intravascular catheter insertion, and the formation of biofilms in several devices by methicillin-resistant Staphylococcus aureus (MRSA) have contributed to the increased number of septic patients, morbidity and mortality. This study aimed to evaluate the virulence of strains through catheter colonization and identification of microbial biofilm, as well as pathological changes on the colonized skin. An experimental biofilm formation model utilized catheter fragments implanted subcutaneously in 25 Swiss mice...
December 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/28504816/virulence-factors-and-antimicrobial-resistance-in-environmental-strains-of-vibrio-alginolyticus
#3
Marcos F Hernández-Robles, Ana K Álvarez-Contreras, Patricia Juárez-García, Iván Natividad-Bonifacio, Everardo Curiel-Quesada, Carlos Vázquez-Salinas, Elsa I Quiñones-Ramírez
Vibrio alginolyticus has acquired increasing importance because this microorganism may be pathogenic to aquatic animals and humans. It has been reported that some V. alginolyticus strains carry virulence genes derived from pathogenic V. cholerae and V. parahaemolyticus strains. In this work V. alginolyticus was isolated from oyster samples acquired from a food-market in Mexico City. Thirty isolates were identified as V. alginolitycus. Strains showed β-haemolysis and proteolytic activity and produced a capsule...
December 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/28504815/the-arago-laboratory-of-banyuls-and-some-of-its-academicians
#4
Marie-Odile Soyer-Gobillard
Since its founding in 1881 by Henri de Lacaze-Duthiers (1821-1901), the Arago Laboratory of Banyuls has been one of the three marine stations of the University Pierre and Marie Curie-Paris 6. It is located in Banyuls (Banyuls-sur-Mer) in Northern Catalonia. The center hosts researchers and students from all over the world. Some became famous, including four Nobel Prize winners: André Lwoff (1965), Pierre-Gilles de Gennes (1991), Albert Fert (2007) and Jules Hoffmann (2011). This article focuses on five scientists closely related to the center...
December 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/28494087/investigation-of-twenty-selected-medicinal-plants-from-malaysia-for-anti-chikungunya-virus-activity
#5
Yik Sin Chan, Kong Soo Khoo, Nam Weng Weng Sit
Chikungunya virus is a reemerging arbovirus transmitted mainly by Aedes mosquitoes. As there are no specific treatments available, Chikungunya virus infection is a significant public health problem. This study investigated 120 extracts from selected medicinal plants for anti-Chikungunya virus activity. The plant materials were subjected to sequential solvent extraction to obtain six different extracts for each plant. The cytotoxicity and antiviral activity of each extract were examined using African monkey kidney epithelial (Vero) cells...
September 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/28494086/functional-ecology-of-soil-microbial-communities-along-a-glacier-forefield-in-tierra-del-fuego-chile
#6
Miguel A Fernández-Martínez, Stephen B Pointing, Sergio Pérez-Ortega, María Arróniz-Crespo, T G Allan Green, Ricardo Rozzi, Leopoldo G Sancho, Asunción de Los Ríos
A previously established chronosequence from Pia Glacier forefield in Tierra del Fuego (Chile) containing soils of different ages (from bare soils to forest ones) is analyzed. We used this chronosequence as framework to postulate that microbial successional development would be accompanied by changes in functionality. To test this, the GeoChip functional microarray was used to identify diversity of genes involved in microbial carbon and nitrogen metabolism, as well as other genes related to microbial stress response and biotic interactions...
September 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/28494085/atypical-enteropathogenic-escherichia-coli-aepec-in-children-under-five-years-old-with-diarrhea-in-quito-ecuador
#7
Francisco X Mora, Rolando X Avilés-Reyes, Laura Guerrero-Latorre, Esteban Fernández-Moreira
Enteropathogenic Escherichia coli (EPEC) remain one the most important pathogens infecting children and they are one of the main causes of persistent diarrhea worldwide. In this study, we have isolated EPEC from 94 stool samples of children under five years old with diarrheal illness in the area of Quito (Ecuador), and we have determined the occurrence of the two subtypes of EPEC, typical EPEC (tEPEC) and atypical (aEPEC), by PCR amplification of the genes eae (attaching and effacing) and bfp (bundle- forming pilus)...
September 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/28494084/the-use-of-high-throughput-dna-sequence-analysis-to-assess-the-endophytic-microbiome-of-date-palm-roots-grown-under-different-levels-of-salt-stress
#8
Mahmoud W Yaish, Ibtisam Al-Harrasi, Aliya S Alansari, Rashid Al-Yahyai, Bernard R Glick
Date palms are able to grow under diverse abiotic stress conditions including in saline soils, where microbial communities may be help in the plant's salinity tolerance. These communities able to produce specific growth promoting substances can enhance date palm growth in a saline environment. However, these communities are poorly defined. In the work reported here, the date palm endophytic bacterial and fungal communities were identified using the pyrosequencing method, and the microbial differential abundance in the root upon exposure to salinity stress was estimated...
September 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/28494083/phosphate-from-stardust-to-eukaryotic-cell-cycle-control
#9
Javier Jiménez, Samuel Bru, Mariana Pc Ribeiro, Josep Clotet
Phosphorus is a pivotal element in all biochemical systems: it serves to store metabolic energy as ATP, it forms the backbone of genetic material such as RNA and DNA, and it separates cells from the environment as phospholipids. In addition to this "big hits", phosphorus has recently been shown to play an important role in other important processes such as cell cycle regulation. In the present review, we briefly summarize the biological processes in which phosphorus is involved in the yeast Saccharomyces cerevisiae before discussing our latest findings on the role of this element in the regulation of DNA replication in this eukaryotic model organism...
September 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/27845499/distribution-of-virulence-genes-involved-in-biofilm-formation-in-multi-drug-resistant-acinetobacter-baumannii-clinical-isolates
#10
Rapee Thummeepak, Phattaraporn Kongthai, Udomluk Leungtongkam, Sutthirat Sitthisak
Acinetobacter baumannii is an opportunistic bacterial pathogen that is the major cause of hospital-acquired infections. It has been shown that A. baumannii with high biofilm formation increases the risk of acquiring infection. In this study, the prevalence of virulence genes involved in biofilm formation was determined in 225 A. baumannii clinical isolates from three hospitals in Thailand. Most of the isolates were multidrug-resistant A. baumannii strains (86.2%). Among all isolates, 76.9% (173/225) showed biofilm formation ability...
June 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/27845498/spatial-homogeneity-of-bacterial-and-archaeal-communities-in-the-deep-eastern-mediterranean-sea-surface-sediments
#11
Sabine Keuter, Baruch Rinkevich
The diversity of microorganisms inhabiting the deep sea surface sediments was investigated in 9 stations (700-1900 m depth) in the Levantine basin by 454 massive tag sequencing of the 16S rDNA V4 region using universal primers. In total, 108,811 reads (an average of 10,088 per sample) were assigned to 5014 bacterial and 966 archaeal operational taxonomic units (OTUs; at 97% cut off). The 55% of the reads were of archaea, indicating dominance of archaea over bacteria at eight of the stations. The diversity and estimated richness values were high (e...
June 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/27845497/lysozyme-as-a-cotreatment-during-antibiotics-use-against-vaginal-infections-an-in-vitro-study-on-gardnerella-vaginalis-biofilm-models
#12
Olivier Thellin, Willy Zorzi, Danièle Zorzi, Philippe Delvenne, Ernst Heinen, Benaïssa ElMoualij, Pascale Quatresooz
Bacterial vaginoses are frequent in women, most of them involving Gardnerella vaginalis. In more than 50% of the cases, usual antibiotic treatments are not capable of eliminating completely the infection, leading to recurrent vaginosis. In addition to the appearance of antibiotic resistance, recurrence can be due to the development of a biofilm by G. vaginalis. In vitro experiments on G. vaginalis biofilms showed that the biofilm protected bacteria from the antibiotic clindamycin. Also, recombinant human lysozyme (rhLys) was able to both degrade biofilms and prevent their formation...
June 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/27845496/characterization-of-the-microbiota-associated-to-pecten-maximus-gonads-using-454-pyrosequencing
#13
Aide Lasa, Alex Mira, Anny Camelo-Castillo, Pedro Belda-Ferre, Jesús L Romalde
A next-generation sequencing (NGS) approach was used to study the microbiota associated to Pecten maximus broodstock, applying pyrosequencing of PCR-amplified V1-V4 16S rRNA gene regions. We analysed the resident bacterial communities in female and male scallop gonads before and after spawning. DNA samples were amplified and quality-filtered reads were assigned to family and genus taxonomic levels using the Ribosomal Database Project classifier. A total of 18,520 sequences were detected, belonging to 13 phyla, including Proteobacteria (55%), Bacteroidetes (11,7%), Firmicutes (3%), Actinobacteria (2%) and Spirochaetes (1,2%), and 110 genera...
June 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/27845495/unicellular-but-not-asocial-life-in-community-of-a-bacterium
#14
Diego Romero
All living organisms have acquired the outstanding ability to overcome the limitations imposed by changeable environments through the gain of genetic traits over years of evolution and the tendency of individuals to associate in communities. The complementation of a singular weakness, the deployment of reinforcement for the good of the community, the better use of resources, or effective defense against external aggression are advantages gained by this communal behavior. Communication has been the cohesive element prompting the global responses that promote efficiency in two features of any community: specialization in differentiated labor and the spatio-temporal organization of the environment...
June 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/27845494/monitoring-of-airborne-biological-particles-in-outdoor-atmosphere-part-2-metagenomics-applied-to-urban-environments
#15
EDITORIAL
Andrés Núñez, Guillermo Amo de Paz, Alberto Rastrojo, Ana M García, Antonio Alcamí, A Montserrat Gutiérrez-Bustillo, Diego A Moreno
The air we breathe contains microscopic biological particles such as viruses, bacteria, fungi and pollen, some of them with relevant clinic importance. These organisms and/or their propagules have been traditionally studied by different disciplines and diverse methodologies like culture and microscopy. These techniques require time, expertise and also have some important biases. As a consequence, our knowledge on the total diversity and the relationships between the different biological entities present in the air is far from being complete...
June 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/27762430/antimicrobial-activity-of-lactobacillus-strains-of-chicken-origin-against-bacterial-pathogenss
#16
Marta Dec, Andrzej Puchalski, Anna Nowaczek, Andrzej Wernicki
This study was conducted to identify and evaluate the antimicrobial activity of some Lactobacillus isolates of chicken origin. Among 90 isolates 14 Lactobacillus species were distinguished using MALDI-TOF mass spectrometry and 16S-ARDRA. The dominant species was L. salivarius (34.4%), followed by L. johnsonii (23.3%), L. crispatus (13.3%) and L. reuteri (11.1%). All lactobacilli were screened for antimicrobial activity against wild-type strains of Salmonella enterica, Escherichia coli, and Clostridium perfringens...
March 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/27762429/a-functional-ferric-uptake-regulator-fur-protein-in-the-fish-pathogen-piscirickettsia-salmonis
#17
Oscar Almarza, Katherine Valderrama, Manuel Ayala, Cristopher Segovia, Javier Santander
Piscirickettsia salmonis, a Gram-negative fastidious facultative intracellular pathogen, is the causative agent of the salmonid rickettsial septicemia (SRS). The P. salmonis iron acquisition mechanisms and its molecular regulation are unknown. Iron is an essential element for bacterial pathogenesis. Typically, genes that encode for the iron acquisition machinery are regulated by the ferric uptake regulator (Fur) protein. P. salmonis fur sequence database reveals a diversity of fur genes without functional verification...
March 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/27762427/prevalence-of-campylobacter-spp-in-diarrhoea-samples-from-patients-in-new-south-wales-australia
#18
Aruna Devi, Adam S Gunjilac, Jenny M Wilkinson, Thiru Vanniasinkam, Timothy J Mahony
Campylobacteriosis is a leading cause of bacterial foodborne disease in many industrialized countries including Australia. New South Wales (NSW) is the most populous state in Australia yet the lack of any Campylobacter species surveillance programs has led to a knowledge gap in the importance of these pathogens as causes of diarrhoea. The data collected in this study demonstrated a need for such programs. In this study, 400 human clinical fecal samples were collected from two NSW locations, Western Sydney and Wagga Wagga, and tested for the presence of Campylobacter spp...
March 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/27762425/haloalkalitolerant-actinobacteria-with-capacity-for-anthracene-degradation-isolated-from-soils-close-to-areas-with-oil-activity-in-the-state-of-veracruz-mexico
#19
Reyna Del C Lara-Severino, Miguel A Camacho-López, Edgar Casanova-González, Leobardo M Gómez-Oliván, Ángel H Sandoval-Trujillo, Keila Isaac-Olivé, Ninfa Ramírez-Durán
The use of native strains of microorganisms from soils is an excellent option for bioremediation. To our knowledge, until now there has been no other group working on the isolation of Actinobacteria from contaminated soils in Mexico. In this study, samples of soils close to areas with oil activity in the State of Veracruz, Mexico, were inoculated for the isolation of Actinobacteria. The strains isolated were characterized morphologically, and the concentrations of NaCl and pH were determined for optimal growth...
March 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/27762424/monitoring-of-airborne-biological-particles-in-outdoor-atmosphere-part-1-importance-variability-and-ratios
#20
Andrés Núñez, Guillermo Amo de Paz, Alberto Rastrojo, Ana M García, Antonio Alcamí, A Montserrat Gutiérrez-Bustillo, Diego A Moreno
The first part of this review ("Monitoring of airborne biological particles in outdoor atmosphere. Part 1: Importance, variability and ratios") describes the current knowledge on the major biological particles present in the air regarding their global distribution, concentrations, ratios and influence of meteorological factors in an attempt to provide a framework for monitoring their biodiversity and variability in such a singular environment as the atmosphere. Viruses, bacteria, fungi, pollen and fragments thereof are the most abundant microscopic biological particles in the air outdoors...
March 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
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