journal
MENU ▼
Read by QxMD icon Read
search

Research in Microbiology

journal
https://www.readbyqxmd.com/read/28427910/stochasticity-of-gene-expression-as-a-motor-of-epigenetics-in-bacteria-from-individual-to-collective-behavior
#1
REVIEW
Stéphanie Bury-Moné, Bianca Sclavi
Measuring gene expression at the single cell and single molecule level has recently made possible the quantitative measurement of stochasticity of gene expression. This enables identification of the probable sources and roles of noise. Stochastic gene expression can result in bacterial population heterogeneity, offering specific advantages for fitness and survival in various environments. This trait is therefore selected during the evolution of the species, and is consequently regulated by specific genetic network architecture...
April 18, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28412534/isolation-and-identification-of-culturable-bacteria-capable-of-heterotrophic-growth-from-rapid-sand-filters-of-drinking-water-treatment-plants
#2
Johanna Vandermaesen, Bart Lievens, Dirk Springael
The microbial community in sand filters (SFs) of drinking water treatment plants (DWTPs) likely contributes to SF functionalities, such as organic carbon removal through heterotrophic metabolism. However, the dynamics and functionality of the SF microbiome and microbial communities in oligotrophic environments, in general, are poorly understood. Therefore, the availability of bacterial cultures from these oligotrophic environments is of great interest, yet it is underrepresented in culture collections. Focusing on heterotrophic carbon metabolism, bacteria were isolated from SFs using conventional media and media that contained SF extracts to mimic the SF environment...
April 12, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28373145/characterization-of-biocontrol-bacterial-strains-isolated-from-a-suppressiveness-induced-soil-after-amendment-with-composted-almond-shells
#3
Carmen Vida, Francisco M Cazorla, Antonio de Vicente
The improvement in soil quality of avocado crops through organic amendments with composted almond shells has a positive effect on crop yield and plant health, and enhances soil suppressiveness against the phytopathogenic fungus Rosellinia necatrix. In previous studies, induced soil suppressiveness against this pathogen was related to stimulation of Gammaproteobacteria, especially some members of Pseudomonas spp. with biocontrol-related activities. In this work, we isolated bacteria from this suppressiveness-induced amended soil using a selective medium for Pseudomonas-like microorganisms...
April 1, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28366838/trichomonas-vaginalis-infection-in-symbiosis-with-trichomonasvirus-and-mycoplasma
#4
Raina Fichorova, Jorge Fraga, Paola Rappelli, Pier Luigi Fiori
Trichomonas vaginalis is a protozoan with an extracellular obligatory parasitic lifestyle exclusively adapted to the human urogenital tract and responsible for nearly a quarter billion sexually transmitted infections worldwide each year. This review focuses on symbiotic Trichomonasvirus and mycoplasma carried by the protozoan, their molecular features and their role in altering the human vaginal microbiome and the immunopathogenicity of the parasite. Improved diagnostics and larger clinical interventional studies are needed to confirm the causative role of protozoan symbionts in the variable clinical presentation of trichomoniasis and its morbid sequelae, including adverse reproductive outcome, susceptibility to viral infections and cancer...
March 31, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28366839/anti-salmonella-activity-and-probiotic-trends-of-kluyveromyces-marxianus-s-2-05-and-kluyveromyces-lactis-s-3-05-isolated-from-a-french-cheese-tomme-d-orchies
#5
Alexandre Ceugniez, Françoise Coucheney, Philippe Jacques, Georges Daube, Véronique Delcenserie, Djamel Drider
Kluyveromyces marxianus S-2-05 and Kluyveromyces lactis S-3-05 were recently isolated from a traditional French cheese, Tomme d'Orchies, and characterized here for their advantages using a different application perspective. First, we established their anti-Salmonella activity and downregulation of the virulence sopD gene of Salmonella enterica subsp. enterica serovar Typhimurium, mainly in the presence of K. marxianus S-2-05. In addition to their antagonism, these non-Saccharomyces yeasts were able to survive under conditions mimicking the gastrointestinal environment and to form biofilms on an abiotic device such as polystyrene...
March 30, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28366837/slpe-is-a-calcium-dependent-cytotoxic-metalloprotease-associated-with-clinical-isolates-of-serratia-marcescens
#6
Nicholas A Stella, Jake D Callaghan, Liang Zhang, Kimberly M Brothers, Regis P Kowalski, Jean J Huang, Patrick H Thibodeau, Robert M Q Shanks
Serralysin-like proteases are found in a wide variety of bacteria. These metalloproteases are frequently implicated in virulence and are members of the widely conserved RTX-toxin family. We identified a serralysin-like protease in the genome of a clinical isolate of Serratia marcescens that is highly similar to the canonical serralysin protein, PrtS. This gene was named serralysin-like protease E, SlpE, and was found in the majority (67%) of tested clinical isolates, but was absent from most tested non-clinical isolates including the insect pathogen and reference S...
March 30, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28365379/phosphotransferase-systems-in-enterococcus-faecalis-og1rf-enhance-anti-stress-capacity-in%C3%A2-vitro-and-in%C3%A2-vivo
#7
Zhen Peng, Matthias A Ehrmann, Anna Waldhuber, Christine Niemeyer, Thomas Miethke, Julia-Stefanie Frick, Tao Xiong, Rudi F Vogel
Phosphotransferase systems are common and essential in bacteria, which are in charge of sugar transportation and phosphorylation. However, phosphotransferase systems were found in recent years to be associated with environmental stress factors. This study investigated the role of the mannose/fructose/sorbose phosphotransferase systems in Enterococcus faecalis OG1RF in adaption to harsh environments by construction of pts mutants. More than one mannose/fructose/sorbose phosphotransferase system was found in E...
March 29, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28344104/antimicrobial-medium-and-long-chain-free-fatty-acids-prevent-prfa-dependent-activation-of-virulence-genes-in-listeria-monocytogenes
#8
Eva Maria Sternkopf Lillebæk, Stine Lambert Nielsen, Rikke Scheel Thomasen, Nils J Færgeman, Birgitte H Kallipolitis
The foodborne pathogen Listeria monocytogenes is the causative agent of the invasive disease listeriosis. Infection by L. monocytogenes involves bacterial crossing of the intestinal barrier and intracellular replication in a variety of host cells. The PrfA protein is the master regulator of virulence factors required for bacterial entry, intracellular replication and cell-to-cell spread. PrfA-dependent activation of virulence genes occurs primarily in the blood and during intracellular infection. In contrast, PrfA does not play a significant role in regulation of virulence gene expression in the intestinal environment...
March 23, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28342836/membrane-fatty-acid-composition-as-a-determinant-of-listeria-monocytogenes-sensitivity-to-trans-cinnamaldehyde
#9
Gil Rogiers, Biniam T Kebede, Ann Van Loey, Chris W Michiels
Trans-cinnamaldehyde, the major compound of cinnamon essential oil, is a potentially interesting natural antimicrobial food preservative. Although a number of studies have addressed its mode of action, the factors that determine bacterial sensitivity or tolerance to trans-cinnamaldehyde are poorly understood. We report the detailed characterization of a Listeria monocytogenes Scott A trans-cinnamaldehyde hypersensitive mutant defective in IlvE, which catalyzes the reversible transamination of branched-chain amino acids to the corresponding short-chain α-ketoacids...
March 23, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28341009/gardnerella-vaginalis-diversity-and-ecology-in-relation-to-vaginal-symptoms
#10
John J Schellenberg, Mo H Patterson, Janet E Hill
Gardnerella vaginalis was first described in 1953, and subsequently identified as the causative agent of a cluster of vaginal symptoms currently known as vaginosis. Research has so far failed to confirm whether and by which mechanism G. vaginalis initiates vaginosis, with, consequently, poor diagnostics and treatment outcomes. Recent molecular analyses of protein-coding genes demonstrate that the taxon G. vaginalis consists of at least four distinct species. This development may represent a critical turning point in clarifying ecological interactions and virulence factors contributing to symptoms and/or sequelae of vaginosis...
March 22, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28279714/untangling-the-transcription-regulatory-network-of-the-bacitracin-synthase-operon-in-bacillus-licheniformis-dw2
#11
Dong Wang, Qin Wang, Yimin Qiu, Christopher T Nomura, Junhui Li, Shouwen Chen
The bacitracin synthetase gene cluster in Bacillus licheniformis DW2 is composed of the bacABC operon encoding a non-ribosomal peptide synthetase and bacT encoding a thioesterase. Although the bacitracin gene cluster has been well studied, little is known about how this gene cluster is regulated. This study provides insight into how the transcription factors Spo0A and AbrB regulate bacitracin biosynthesis. Deletion of spo0A resulted in drastically reduced expression of bacA and bacT, and subsequently bacitracin production...
March 7, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28263907/role-of-the-interplay-between-quorum-sensing-regulator-vqsr-and-the-pseudomonas-quinolone-signal-in-mediating-carbapenem-tolerance-in-pseudomonas-aeruginosa
#12
Darija Viducic, Keiji Murakami, Takashi Amoh, Tsuneko Ono, Yoichiro Miyake
Pseudomonas aeruginosa coordinates its response to environmental conditions through activation of a quorum sensing (QS) system. In this study, we investigated the regulatory interaction between the QS transcriptional regulator VqsR and the Pseudomonas quinolone signal (PQS) through integration of sigma factor RpoS, and we addressed whether one of the pathways controlling carbapenem tolerance can be attributed to VqsR. We demonstrate that vqsR expression at the transcriptional level is regulated by pqsA, pqsR, and pqsE...
March 2, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28263906/characterization-of-genetic-determinants-involved-in-antibiotic-resistance-in-aeromonas-spp-and-fecal-coliforms-isolated-from-different-aquatic-environments
#13
Alessandro Carnelli, Federica Mauri, Antonella Demarta
Aeromonas spp. and fecal coliforms, two abundant and cultivable bacterial populations that can be found in water ecosystems, might substantially contribute to the spread of antibiotic resistance. We investigated the presence and spread of transposons (elements that can move from one location to another in the genome), integrons (structures able to capture and incorporate gene cassettes) and resistance plasmids in strains isolated from polluted and unpolluted water. We recovered 231 Aeromonas and 250 fecal coliforms from water samplings with different degrees of pollution (hospital sewage, activated sludge of a wastewater treatment plant, river water before and after treatment and water from an alpine lake)...
March 2, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28263905/carotenoid-production-and-phenotypic-variation-in-azospirillum-brasilense
#14
Gal Reem Brenholtz, Dafna Tamir-Ariel, Yaacov Okon, Saul Burdman
We assessed the occurrence of phenotypic variation in Azospirillum brasilense strains Sp7, Cd, Sp245, Az39 and phv2 during growth in rich media, screening for variants altered in colony pigmentation or extracellular polysaccharide (EPS) production. Previous studies showed that EPS-overproducing variants of Sp7 appear frequently following starvation or growth in minimal medium. In contrast, no such variants were detected during growth in rich media in the tested strains except for few variants of phv2. Regarding alteration in colony pigmentation (from pink to white in strain Cd and from white to pink in the others), strain Sp7 showed a relatively high frequency of variation (0...
March 2, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28263904/utilization-of-interferometric-light-microscopy-for-the-rapid-analysis-of-virus-abundance-in-a-river
#15
Céline Roose-Amsaleg, Yasmina Fedala, Catherine Vénien-Bryan, Josette Garnier, Albert-Claude Boccara, Martine Boccara
There is a constant need for direct counting of biotic nanoparticles such as viruses to unravel river functioning. We used, for the first time in freshwater, a new method based on interferometry differentiating viruses from other particles such as membrane vesicles. In the French Marne River, viruses represented between 42 and 72% of the particles. A spring monitoring in 2014 revealed their increase (2.1 × 10(7) to 2.1 × 10(8) mL(-1)) linked to an increase in algal biomass and diversity of bacterial plankton...
March 2, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28263903/candida-and-its-dual-lifestyle-as-a-commensal-and-a-pathogen
#16
Mathieu Cauchie, Stefanie Desmet, Katrien Lagrou
Candida spp. are part of the normal vaginal microflora in 20-30% of healthy women. However, if the balance between these yeasts and the host is disturbed, Candida spp. can cause vulvovaginal candidiasis (VVC), with Candida albicans being the major causative agent. Different studies have been performed in order to better understand Candida's dual lifestyle in the vagina. The potential of C. albicans to switch from the yeast cell morphology to its hyphal form is considered a key element in VVC pathogenesis. Candida spp...
March 2, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28263902/mollicutes-in-vaginal-microbiology-mycoplasma-hominis-ureaplasma-urealyticum-ureaplasma-parvum-and-mycoplasma-genitalium
#17
David Taylor-Robinson
Mycoplasma hominis was isolated in 1937 from the human genital tract, followed 17 years later by Ureaplasma urealyticum and 27 years after that by Mycoplasma genitalium. The first two proved relatively easy to culture but the latter required a polymerase chain reaction assay for further studies. In sexually mature women, M. hominis may be found in the vagina/cervix of about 20-50%, ureaplasmas in 40-80% and M. genitalium in 0-5%. Some heterogeneity has been found among strains of all these species, sufficient to divide ureaplasmas into two species, namely U...
March 2, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28257809/the-global-health-impact-of-vaginal-dysbiosis
#18
Janneke H H M van de Wijgert, Vicky Jespers
The most common dysbiosis of the vaginal microbiome (defined here as a vaginal microbiome not dominated by lactobacilli) is bacterial vaginosis, an anaerobic polybacterial dysbiosis. Other dysbiotic states of importance to global health are vaginal microbiota with a high abundance of streptococci, staphylococci or Enterobacteriaceae, vaginal candidiasis and trichomoniasis. Knowledge about the different types of dysbiosis and their relationship to urogenital and reproductive disease burden has increased in recent years by applying non-culture-based techniques, but is far from complete...
March 1, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28242352/the-role-of-escherichia-coli-in-reproductive-health-state-of-the-art
#19
Piet Cools
Escherichia coli is a well-known commensal of the normal; intestinal microbiome that can also colonize the vaginal microbiome, usually without symptoms. However, E. coli can also be a highly virulent, and frequently deadly, pathogen. In this review, I will discuss the role E. coli has in reproductive health and disease.
February 24, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28235561/physiological-and-comparative-genomic-analysis-of-acidithiobacillus-ferrivorans-pq33-provides-psychrotolerant-fitness-evidence-for-oxidation-at-low-temperature
#20
Robert Ccorahua-Santo, Anika Eca, Michel Abanto, Gregory Guerra, Pablo Ramírez
Friendly environmental hydrometallurgy at low temperatures is principally promoted by Acidithiobacillus ferrivorans. Until recently, the synergy between cold tolerance and the molecular mechanism of ferrous iron (Fe(2+)) oxidation was unknown. In the present paper, we conducted a physiological and comparative genomics analysis of the new strain A. ferrivorans PQ33 to elucidate the oxidation mechanism at low temperatures, with emphasis placed on trehalose and the Rus operon. PQ33 exhibited a doubling time of 66...
February 21, 2017: Research in Microbiology
journal
journal
30119
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"