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Actinomyces

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https://www.readbyqxmd.com/read/28820412/-to-the-state-of-the-fetoplacental-complex-in-women-with-the-threat-of-abortion
#1
L Rzaguliyeva, Z Osmanli, S Akperbekova, N Meybalizade
The goal is a comprehensive study of the morphofunctional state of the mother-placenta-fetus system in placental insufficiency and infection. 250 pregnant and puerperas for the period 2008-2014 were examined. Detection of bacterial flora was carried out in 35 pregnant women aged 20.4±0.8 years with the threat of abortion from an early gestation period and a prolonged persistent infection of the genitals, bacterial vaginosis. Methods are applied: culture, ion chromatography, gas-liquid chromatography with mass spectrometry...
July 2017: Georgian Medical News
https://www.readbyqxmd.com/read/28797211/disulfide-bonds-a-key-modification-in-bacterial-extracytoplasmic-proteins
#2
S F Lee, L Davey
Disulfide bonds are a common posttranslational modification that contributes to the folding and stability of extracytoplasmic proteins. Almost all organisms, from eukaryotes to prokaryotes, have evolved enzymes to make and break these bonds. Accurate and efficient disulfide bond formation can be vital for protein function; therefore, the enzymes that catalyze disulfide bond formation are involved in multiple biological processes. Recent advances clearly show that oral bacteria also have the ability to from disulfide bonds, and this ability has an effect on a range of dental plaque-related phenotypes...
August 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28766815/rhamnolipids-and-lactonic-sophorolipids-natural-antimicrobial-surfactants-for-oral-hygiene
#3
M Elshikh, I Moya-Ramírez, H Moens, S Roelants, W Soetaert, R Marchant, I M Banat
AIMS: To assess the efficacy of rhamnolipid (mixture of mono- and di-rhamnolipid congeners, purified monorhamnolipid, dirhamnolipid and lactonic sophorolipid biosurfactants against pathogens important for oral hygiene. METHODS AND RESULTS: Acquired and produced biosurfactants were fully characterised to allow the antimicrobial activity to be assigned to the biosurfactant congeners. Antimicrobial activity was assessed using the resazurin aided microdilution method...
August 2, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28764230/pulmonary-actinomycosis-in-a-patient-with-aids-hcv
#4
Payam Tabarsi, Sootiya Yousefi, Sayena Jabbehdari, Majid Marjani, Parvaneh Baghaei
Pulmonary actinomycosis is a rare bacterial lung infection which is caused mainly by Actinomyces israelii. This non contagious infection can destroy parts of the lungs. There are variable presentations of pulmonary actinomycosis with similarity in manifestations to other infectious diseases of the lungs. Pulmonary actinomycosis is diagnosed by fine needle aspiration, bronchoscopy and finding of typical sulfur granules. We present a case of pulmonary actinomycosis in a middle aged (AIDS/HCV) man with massive hemoptysis and progressive dyspnoea...
June 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28752291/composition-and-abundance-of-microbiota-in-the-pharynx-in-patients-with-laryngeal-carcinoma-and-vocal-cord-polyps
#5
Hongli Gong, Boyan Wang, Yi Shi, Yong Shi, Xiyan Xiao, Pengyu Cao, Lei Tao, Yuezhu Wang, Liang Zhou
The pharynx is an important site of microbiota colonization, but the bacterial populations at this site have been relatively unexplored by culture-independent approaches. The aim of this study was to characterize the microbiota structure of the pharynx. Pyrosequencing of 16S rRNA gene libraries was used to characterize the pharyngeal microbiota using swab samples from 68 subjects with laryngeal cancer and 28 subjects with vocal cord polyps. Overall, the major phylum was Firmicutes, with Streptococcus as the predominant genus in the pharyngeal communities...
August 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28731663/-pulmonary-actinomycosis-and-tuberculosis-a-comorbidity-pediatric-case
#6
Elsa D Bisero, Graciela F Luque, Cristina N Rizzo, Alejandra E Zapata, María S Cuello
Actinomycosis is a chronic suppurative infection, produced by anaerobic Gram-positive bacteria or microaerobic Actinomyces species. It is rare in children and adolescents and it is more common in immunocompromised. Mycobacterium tuberculosis collaborates on the development of the disease. Pulmonary involvement appears as a picture of chronic condensation that does not improve with conventional antibiotic treatment. Classic complications affecting the thoracic wallwith drainage in «sulfur granule» and fistulization are described less frequently nowadays...
August 1, 2017: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/28729282/draft-genome-sequence-of-actinomycessucciniciruminis-strain-am4-t-isolated-from-cow-rumen-fluid
#7
Susakul Palakawong Na Ayudthaya, Bastian Hornung, Adithi Ravikumar Varadarajan, Wendy Plugge, Caroline M Plugge
Actinomyces succiniciruminis strain Am4(T), isolated from cow rumen fluid, can metabolize a range of substrates including complex carbohydrates to organic acids. Here, we report a 3.33-Mbp draft genome of Actinomyces succiniciruminis.
July 20, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28721040/effect-of-ultraviolet-treatment-on-bacterial-attachment-and-osteogenic-activity-to-alkali-treated-titanium-with-nanonetwork-structures
#8
Honghao Zhang, Satoshi Komasa, Chiho Mashimo, Tohru Sekino, Joji Okazaki
PURPOSE: Alkali-treated titanium with nanonetwork structures (TNS) possesses good osteogenic activity; however, the resistance of this material to bacterial contamination remains inadequate. As such, TNS implants are prone to postoperative infection. In this work, we attempted to alter the biological properties of TNS by treatment with short-duration high-intensity ultraviolet (UV) irradiation. METHODS: TNS discs were treated with UV light (wavelength =254 nm, strength =100 mW/cm(2)) for 15 minutes using a UV-irradiation machine...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28714842/molecular-and-biochemical-characteristics-of-the-inulosucrase-hugo-from-streptomyces-viridochromogenes-dsm40736-t%C3%A3-494
#9
Hans-Jörg Frasch, Sander S van Leeuwen, Lubbert Dijkhuizen
Polyfructans are synthesized from sucrose by plants (mostly inulin) and by both Gram-negative and Gram-positive bacteria (mostly levan). In the phylum Actinobacteria only levan synthesis by Actinomyces species has been reported. We have identified a putative fructansucrase gene (hugO) in Streptomyces viridochromogenes DSM40736 (Tü494). HugO was heterologously expressed and biochemically characterized. HPSEC-MALLS and 2D-1H-13C nuclear magnetic resonance (NMR) spectroscopy analysis showed that the fructan polymer produced in vitro has an Molecular Weight of 2...
July 17, 2017: Microbiology
https://www.readbyqxmd.com/read/28690491/a-complicated-thread-abdominal-actinomycosis-in-a-young-woman-with-crohn-disease
#10
Ari Nahum, Gregory Filice, Ashish Malhotra
Crohn disease is a chronic inflammatory condition that primarily affects the gastrointestinal tract. Typical manifestations include fever, weight loss, fatigue, and abdominal pain, and abdominal abscesses and fistulae are frequent complications. Abdominal actinomycosis is a subacute or indolent disease associated with Actinomyces spp. Symptoms can be very similar to those of Crohn disease, and fistulae are also common. Since ulcerations in the intestinal tract are thought to be caused by Actinomyces escaping from the gut lumen and establishing intra-abdominal infection, it seems likely that abdominal actinomycosis may occur in patients with inflammatory bowel disease...
May 2017: Case Reports in Gastroenterology
https://www.readbyqxmd.com/read/28688759/-respiratory-infections-caused-by-slow-growing-bacteria-nocardia-actinomyces-rhodococcus
#11
E Eschapasse, C Hussenet, A Bergeron, D Lebeaux
INTRODUCTION: Pneumonia caused by slow-growing bacteria is rare but sometimes severe. STATE OF THE ART: These infections share many similarities such as several differential diagnoses, difficulties to identify the pathogen, the importance of involving the microbiologist in the diagnostic investigation and the need for prolonged antibiotic treatment. However, major differences distinguish them: Nocardia and Rhodococcus infect mainly immunocompromised patients while actinomycosis also concerns immunocompetent patients; the severity of nocardioses is related to their hematogenous spread while locoregional extension by contiguity makes the gravity of actinomycosis...
July 5, 2017: Revue des Maladies Respiratoires
https://www.readbyqxmd.com/read/28684963/pelvic-actinomycosis
#12
REVIEW
Alejandra García-García, Ninfa Ramírez-Durán, Horacio Sandoval-Trujillo, María Del Socorro Romero-Figueroa
INTRODUCTION: Actinomycosis is a chronic bacterial infection caused by Actinomyces, Gram-positive anaerobic bacteria. Its symptomatology imitates some malignant pelvic tumours, tuberculosis, or nocardiosis, causing abscesses and fistulas. Actinomycoses are opportunistic infections and require normal mucous barriers to be altered. No epidemiological studies have been conducted to determine prevalence or incidence of such infections. OBJECTIVE: To analyse the clinical cases of pelvic actinomycosis reported worldwide, to update the information about the disease...
2017: Canadian Journal of Infectious Diseases & Medical Microbiology
https://www.readbyqxmd.com/read/28678838/the-oral-bacterial-microbiome-of-occlusal-surfaces-in-children-and-its-association-with-diet-and-caries
#13
Apoena Aguiar Ribeiro, Maria Andrea Azcarate-Peril, Maria Belen Cadenas, Natasha Butz, Bruce J Paster, Tsute Chen, Eric Bair, Roland R Arnold
Dental caries is the most prevalent disease in humans globally. Efforts to control it have been invigorated by an increasing knowledge of the oral microbiome composition. This study aimed to evaluate the bacterial diversity in occlusal biofilms and its relationship with clinical surface diagnosis and dietary habits. Anamneses were recorded from thirteen 12-year-old children. Biofilm samples collected from occlusal surfaces of 46 permanent second molars were analyzed by 16S rRNA amplicon sequencing combined with the BLASTN-based search algorithm for species identification...
2017: PloS One
https://www.readbyqxmd.com/read/28673590/parkinson-s-disease-the-hibernating-spore-hypothesis
#14
Ketil Berstad, Johanna E R Berstad
The authors support the hypothesis that a causative agent in Parkinson's disease (PD) might be either fungus or bacteria with fungus-like properties - Actinobacteria, and that their spores may serve as 'infectious agents'. Updated research and the epidemiology of PD suggest that the disease might be induced by environmental factor(s), possibly with genetic susceptibility, and that α-synuclein probably should be regarded as part of the body's own defense mechanism. To explain the dual-hit theory with stage 1 involvement of the olfactory structures and the 'gut-brain'-axis, the environmental factor is probably airborne and quite 'robust' entering the body via the nose/mouth, then to be swallowed reaching the enteric nervous system with retained pathogenicity...
July 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28670596/actinomycosis-causing-recurrent-perianal-fistulae
#15
Mariana Ferreira Cardoso, Carla Carneiro, Luís Carvalho Lourenço, Catarina Graça Rodrigues, Sara Folgado Alberto, Ana Alagoa João, Ricardo Rocha, Vasco Geraldes, Ana Costa, Jorge Reis, Vítor Nunes
Actinomycosis is a rare but easily curable infection that should be considered in the differential diagnosis of perianal fistulizing disease. We present the case of a 26-year-old woman with complex perianal fistulae, including trans-sphincteric and suprasphincteric fistulous tracts and a rectovaginal fistula, requiring multiple abscess drainages, seton placement, and antibiotic courses, with little improvement. After extensive investigation, Actinomyces spp. was identified in anal cytology. The patient underwent a 6-week course of intravenous penicillin followed by oral amoxicillin, with remarkable improvement...
2017: ACG Case Reports Journal
https://www.readbyqxmd.com/read/28669068/evaluation-of-laser-fluorescence-in-monitoring-non-cavitated-caries-lesion-progression-on-smooth-surfaces-in-vitro
#16
J A Rodrigues, C S Sarti, C M Assunção, R A Arthur, A Lussi, M B Diniz
The aim of this study was to evaluate the performance of a pen-type laser fluorescence (LF) device (LFpen: DIAGNOdent pen) to detect and monitor the progression of caries-like lesions on smooth surfaces. Fifty-two bovine enamel blocks were submitted to three different demineralisation cycles for caries-like lesion induction using Streptococcus mutans, Lactobacillus casei and Actinomyces naeslundii. At baseline and after each cycle, the enamel blocks were analysed under Knoop surface micro-hardness (SMH) and an LFpen...
July 2, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28662376/proteases-actinidin-papain-and-trypsin-reduce-oral-biofilm-on-the-tongue-in-elderly-subjects-and-in-vitro
#17
Naho Mugita, Takayuki Nambu, Kazuya Takahashi, Pao-Li Wang, Yutaka Komasa
OBJECTIVE: Dental plaque is a causative factor for oral disease and a potential reservoir for respiratory infection in the elderly. Therefore, there is a critical need for the development of effective methods to remove oral biofilm. The objective of this study was to investigate the effect of proteases on oral biofilm formation andremoval. DESIGN: The in vivo effect of actinidin, a cysteine protease, on the removal of tongue coating was assessed after orally taking a protease tablet...
June 13, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28647397/actinomyces-radicidentis-and-actinomyces-haliotis-coccoid-actinomyces-species-isolated-from-the-human-oral-cavity
#18
Rolf Claesson, Ulf Sjögren, Anders Esberg, Malin Brundin, Margareta Granlund
There are few reports on the bacterial species Actinomyces radicidentis in the literature. In this study, putative A. radicidentis isolates were collected from 16 root canal samples from 601 examined patients. The isolates were examined by biochemical tests, 16S rRNA gene sequencing, Arbitrarily-primed (AP-) PCR, antibiotic susceptibility testing, and MALDI-TOF analyses. In parallel, two A. radicidentis reference strains and two putative A. radicidentis isolates from United Kingdom were tested. Sixteen of the 18 isolates were confirmed as A...
June 21, 2017: Anaerobe
https://www.readbyqxmd.com/read/28643960/asymptomatic-subcutaneous-cervical-mass-due-to-actinomyces-odontolyticus-infection-in-a-pyriform-sinus-fistula
#19
Ryu Yanagisawa, Kisei Minami, Noriko Kubota, Tamaki Iwade, Yoshifumi Ogiso
No abstract text is available yet for this article.
June 23, 2017: Pediatrics International: Official Journal of the Japan Pediatric Society
https://www.readbyqxmd.com/read/28634238/electron-transport-chain-is-biochemically-linked-to-pilus-assembly-required-for-polymicrobial-interactions-and-biofilm-formation-in-the-gram-positive-actinobacterium-actinomyces-oris
#20
Belkys C Sanchez, Chungyu Chang, Chenggang Wu, Bryan Tran, Hung Ton-That
The Gram-positive actinobacteria Actinomyces spp. are key colonizers in the development of oral biofilms due to the inherent ability of Actinomyces to adhere to receptor polysaccharides on the surface of oral streptococci and host cells. This receptor-dependent bacterial interaction, or coaggregation, requires a unique sortase-catalyzed pilus consisting of the pilus shaft FimA and the coaggregation factor CafA forming the pilus tip. While the essential role of the sortase machine SrtC2 in pilus assembly, biofilm formation, and coaggregation has been established, little is known about trans-acting factors contributing to these processes...
June 20, 2017: MBio
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