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https://www.readbyqxmd.com/read/28922555/laser-micro-ablation-of-fibrocartilage-tissue-effects-of-tissue-processing-on-porosity-modification-and-mechanics
#1
A M Matuska, P S McFetridge
The temporomandibular joint disk (TMJd) is an extremely dense and avascular fibrocartilaginous extracellular matrix (ECM) resulting in a limited regenerative capacity. The use of decellularized TMJd as a biocompatible scaffold to guide tissue regeneration is restricted by innate subcellular porosity of the ECM that hinders cellular infiltration and regenerative events. Incorporation of an artificial microporosity through laser micro-ablation (LMA) can alleviate these cell and diffusion based limitations. In this study, LMA was performed either before or after decellularization to assess to effect of surfactant treatment on porosity modification as well as the resultant mechanical and physical scaffold properties...
September 18, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28920424/nanotubular-iridium-cobalt-mixed-oxide-crystalline-architectures-inherited-from-cobalt-oxide-for-highly-efficient-oxygen-evolution-reaction-catalysis
#2
Areum Yu, Chongmok Lee, Myung Hwa Kim, Youngmi Lee
We report the unique transformation of one-dimensional tubular mixed oxide nanocomposites of iridium (Ir) and cobalt (Co) denoted as IrxCo1-xOy, where x is the relative Ir atomic content to the overall metal content. The formation of a variety of IrxCo1-xOy (0 ≤ x ≤ 1) crystalline tubular nanocomposites was readily achieved by electrospinning and subsequent calcination process. Structural characterizations clearly confirmed that IrxCo1-xOy polycrystalline nanocomposites had a tubular morphology consisting of Ir/IrO2 and Co3O4; and Ir, Co and O were homogeneously distributed throughout the entire nanostructures...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28919687/presence-and-characterization-of-escherichia-coli-virulence-genes-isolated-from-diseased-pigs-in-the-central-region-of-argentina
#3
Fernando A Bessone, Gabriela Bessone, Sebastián Marini, María B Conde, Fabrisio E Alustiza, Gustavo Zielinski
BACKGROUND: The main pathogen of neonatal and post weaning diarrhea and edema disease (ED) is Escherichia coli and pathotypes involved are enterotoxigenic, enteropathogenic, and shiga toxigenic (ETEC, EPEC, and STEC, respectively). Those diseases cause economic loss in pig production. AIM: The aim of this work was to evaluate the presence of strains expressing virulence markers genes and the antibiotic susceptibility profiles of E. coli from clinical cases of post weaning diarrhea and ED in farms in the central area of Argentina...
August 2017: Veterinary World
https://www.readbyqxmd.com/read/28911793/passive-air-sampling-of-polybrominated-diphenyl-ethers-in-new-delhi-kolkata-mumbai-and-chennai-levels-homologous-profiling-and-source-apportionment
#4
Paromita Chakraborty, Gan Zhang, Hairong Cheng, Prithiviraj Balasubramanian, Jun Li, Kevin C Jones
Several studies in the recent past reported new sources for industrial persistent organic pollutants (POPs) from metropolitan cities of India. To fill the data gap for atmospheric polybrominated diphenyl ethers (PBDEs), polyurethane foam disk passive air sampling (PUF-PAS) was conducted along urban-suburban-rural transects in four quadrilateral cities viz., New Delhi, Kolkata, Mumbai and Chennai from northern, eastern, western and southern India respectively. Average concentration of Σ8PBDEs in pg/m(3) for New Delhi, Kolkata, Mumbai and Chennai were 198, 135, 264 and 144 respectively...
September 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28910166/prevalence-antimicrobial-resistance-and-relatedness-of-salmonella-isolated-from-chickens-and-pigs-on-farms-abattoirs-and-markets-in-sichuan-province-china
#5
Suzhen Ma, Changwei Lei, Linghan Kong, Wei Jiang, Bihui Liu, Shuai Men, Yanxian Yang, Guangyang Cheng, Yanpeng Chen, Hongning Wang
This study aims at investigating the distribution, antimicrobial resistance, and genetic relationship of Salmonella isolated from 18 farms, their downstream abattoirs, and markets of chickens and pigs in Sichuan province, China. A total of 193 Salmonella isolates were identified from 693 samples with an isolation rate of 26.27% (88/335) in chickens and 29.33% (105/358) in pigs. Salmonella was isolated more frequently in abattoirs and markets than from farms. Serotypes were determined according to the White-Kauffmann-Le Minor scheme and 16 different serotypes were identified, with Derby being the most common, followed by Typhimurium and Meleagridis...
September 14, 2017: Foodborne Pathogens and Disease
https://www.readbyqxmd.com/read/28900009/on-the-origin-of-shape-fluctuations-of-the-cell-nucleus
#6
Fang-Yi Chu, Shannon C Haley, Alexandra Zidovska
The nuclear envelope (NE) presents a physical boundary between the cytoplasm and the nucleoplasm, sandwiched in between two highly active systems inside the cell: cytoskeleton and chromatin. NE defines the shape and size of the cell nucleus, which increases during the cell cycle, accommodating for chromosome decondensation followed by genome duplication. In this work, we study nuclear shape fluctuations at short time scales of seconds in human cells. Using spinning disk confocal microscopy, we observe fast fluctuations of the NE, visualized by fluorescently labeled lamin A, and of the chromatin globule surface (CGS) underneath the NE, visualized by fluorescently labeled histone H2B...
September 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28893751/non-typhoidal-salmonella-in-calabria-italy-a-laboratory-and-patient-based-survey
#7
Valentina Mascaro, Claudia Pileggi, Maria Crinò, Yolande Therese Rose Proroga, Maria Rosaria Carullo, Caterina Graziani, Fabio Arigoni, Pasquale Turno, Maria Pavia
INTRODUCTION: Although there has been a decrease in the number of cases of salmonellosis in the European Union, it still represents the primary cause of foodborne outbreaks. In Calabria region, data are lacking for the incidence of human non-typhoid salmonellosis as active surveillance has never been carried out. OBJECTIVE: To report the results of a laboratory and patient-based morbidity survey in Calabria to describe the incidence and distribution of Salmonella serovars isolated from humans, with a focus on antimicrobial resistance patterns...
September 11, 2017: BMJ Open
https://www.readbyqxmd.com/read/28884110/malignant-triton-tumor-a-rare-cause-of-sciatic-pain-and-foot-drop
#8
Maribel R Gomes, Alexandre M P Sousa, Roberto J A Couto, Marco M B Oliveira, João L M Moura, Carlos A Vilela
Malignant peripheral nerve sheath tumors (MPNST) are very rare and are frequently localized in the buttocks, thigh, arm, or paraspinal region; one variant is the malignant Triton tumor, with rhabdomyosarcomatous differentiation. The authors present a challenging differential diagnosis of a sciatic pain and foot drop in a woman with history of lumbar disk herniation, which was found to be caused by a Triton tumor of the sciatic nerve. She underwent surgical excision, followed by radiation and chemotherapy. Malignant Triton tumor cases have rarely been described and reported in the literature...
June 2017: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/28883605/effect-of-a-hyperbaric-environment-diving-conditions-on-adhesive-restorations-an-in-vitro-study
#9
C Mocquot, A Cabrera, P Colon, J Bosco, B Grosgogeat, N Pradelle-Plasse
Objectives No recent study has addressed the effect of diving conditions (pressure increase) on adhesive restorations. We evaluated the impact of a simulated hyperbaric environment on microleakage of the dentine-composite resin interface. The ultimate aim was to propose recommendations for restorative dentistry for patients who are divers to limit barodontalgia (dental pain caused by pressure variations of the environment) and may lead to dangerous sequelae.Methods We bonded 20 dentine disks by using an adhesive system (Scothbond Universal) to ten intact composite cylinders and ten composite cylinders with porosity (Ceram X mono)...
September 8, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28870091/high-prevalence-of-oxa-type-carbapenemases-among-acinetobacter-baumannii-strains-in-a-teaching-hospital-of-tehran
#10
Mandana Zafari, Mohamad Mehdi Feizabadi, Sirous Jafari, Alireza Abdollahi, Azar Sabokbar
Nosocomial infection caused by carbapenem-resistant Acinetobacter baumannii (CRAB) has created a public health concern all around the world. In this study, 100 isolates of CRAB from hospitalized patients during 2015-2016 at Imam Khomeini Hospital were investigated to determine the rates of multidrug-resistant (MDR) and extensively drug-resistant (XDR) strains using Kirby-Bauer disk diffusion method. The minimum inhibitory concentrations (MICs) of six antibiotics were determined by broth microdilution method...
September 5, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28869798/antimicrobial-activity-of-plant-extracts-against-the-honeybee-pathogens-paenibacillus-larvae-and-ascosphaera-apis-and-their-topical-toxicity-to-apis-mellifera-adults
#11
Veeranan Chaimanee, Ubonwan Thongtue, Nantaporn Sornmai, Sineenard Songsri, Jeffery S Pettis
AIMS: To explore alternative non-chemical control measures against two honeybee pathogens, Paenibacillus larvae and Ascosphaera apis, thirty-seven plant species were screened for antimicrobial activity. METHODS AND RESULTS: The activity of selected plant extracts was screened using a in vitro disk diffusion assay and the minimal inhibitory concentration (MIC) was determined by the broth microdilution method. The results showed that thirty-six plant extracts had some antibacterial activity on P...
September 4, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28867760/in-vitro-study-of-serial-changes-to-carmustine-wafers-gliadel-with-mr-imaging-and-computed-tomography
#12
Satoshi Doishita, Taro Shimono, Tetsuya Yoneda, Eiji Yamada, Taro Tsukamoto, Daichi Takemori, Daisuke Kimura, Hiroyuki Tatekawa, Shinichi Sakamoto, Yukio Miki
PURPOSE: Implantation of carmustine wafers (Gliadel) in vivo is accompanied by characteristic serial changes on magnetic resonance imaging (MRI) and computed tomography (CT), such as transient hyperintensity of the wafers on T1-weighted images (T1WIs) and considerable gas accumulation in surgical resection cavities. The purpose of this study was to evaluate intrinsic imaging changes to carmustine wafers in vitro. METHODS: Three phantoms simulating a surgical resection cavity were constructed...
September 4, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28866692/frequency-and-molecular-epidemiology-of-panton-valentine-leukocidin-gene-in-staphylococcus-aureus-colonising-hiv-infected-patients
#13
Z Mohd-Zain, S F A Mohd-Nawi, A Adnan, S Kumar
BACKGROUND: HIV-infected patients pose a high risk of contracting skin and soft tissue infections caused by Staphylococcus aureus. Those who are colonized with methicillin-resistant S. aureus (MRSA) that carry Panton-Valentine leukocidin (PVL) are predisposed to severe infections that could lead to necrotic skin infections. However the association of S. aureus specifically methicillin sensitive S. aureus carrying PVL gene in HIV patients has not been widely reported. Here, we study the prevalence and the molecular epidemiology of PVL-producing S...
August 2017: Malaysian Journal of Pathology
https://www.readbyqxmd.com/read/28866136/major-globally-disseminated-clonal-complexes-of-antimicrobial-resistant-enterococci-associated-with-infections-in-cancer-patients-in-brazil
#14
Barbara A Santos, Jéssica S Oliveira, Nayara T Cardoso, André V Barbosa, Silvana V Superti, Lúcia M Teixeira, Felipe P G Neves
Cancer and hematological malignancies constitute major comorbidities in enterococcal infections, but little is known about the characteristics of enterococci affecting cancer patients. The aim of this study was to characterize 132 enterococcal clinical isolates obtained from cancer patients attending a Cancer Reference Center in Brazil between April 2013 and March 2014. Susceptibility to 17 antimicrobial agents was assessed by disk diffusion method. Resistance and virulence genes were investigated by PCR. Multilocus sequence typing (MLST) was performed for selected Enterococcus faecalis and Enterococcus faecium isolates...
September 1, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28865124/dry-biorefining-maximizes-the-potentials-of-simultaneous-saccharification-and-co-fermentation-for-cellulosic-ethanol-production
#15
Gang Liu, Qiang Zhang, Hongxing Li, Abdul Sattar Qureshi, Jian Zhang, Xiaoming Bao, Jie Bao
Despite the well-recognized merits of simultaneous saccharification and co-fermentation (SSCF) on relieving sugar product inhibition on cellulase activity, a practical concomitance difficulty of xylose with inhibitors in the pretreated lignocellulose feedstock prohibits the essential application of SSCF for cellulosic ethanol fermentation. To maximize the SSCF potentials for cellulosic ethanol production, a dry biorefining approach was proposed starting from dry acid pretreatment, disk milling and biodetoxification of lignocellulose feedstock...
September 2, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28861267/frequency-of-antiseptic-resistance-genes-in-clinical-staphycocci-and-enterococci-isolates-in-turkey
#16
Seyda Ignak, Yasar Nakipoglu, Bulent Gurler
BACKGROUND: Disinfectants and antiseptics are biocides widely used in hospitals to prevent spread of pathogens. It has been reported that antiseptic resistance genes, qac's, caused tolerance to a variety of biocidal agents, such as benzalkonium chloride (BAC) and chlorhexidine digluconate (CHDG) in Staphylococcus spp. isolates. We aimed to search the frequency of antiseptic resistance genes in clinical Staphylococcus spp. and Enterococcus spp. isolates to investigate the possible association with antiseptic tolerance and antibiotic resistance...
2017: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/28859499/prevalence-and-molecular-typing-of-methicillin-resistant-staphylococcus-aureus-carrying-panton-valentine-leukocidin-gene
#17
Maryam Rahimpour Hesari, Ali Salehzadeh, Reza Kazemi Darsanaki
Panton-Valentine leukocidin (pvl) toxin is an important virulence factor of Staphylococcus aureus. The main genes are coa and spa for distinguishing and typing of S. aureus isolates. The aim of this study was to investigate antibiotic resistance, presence of mecA and pvl genes, as well as epidemiological typing of these isolates according to polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method in clinical sample isolated from Rasht city, Iran. A total of 250 clinical samples have been isolated from different hospitals...
September 1, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28859497/first-report-of-coexistence-of-ampc-beta-lactamase-genes-in-klebsiella-pneumoniae-strains-isolated-from-burn-patients
#18
Roya Ghanavati, Davood Darban-Sarokhalil, Fateme Navab-Moghadam, Hossein Kazemian, Gholamreza Irajian, Shabnam Razavi
Klebsiella spp. are among the most frequently isolated bacteria from burn wounds. These organisms are among the most important opportunistic pathogens, causing hospital-acquired and healthcare-associated infections worldwide. Limited information is available about prevalence of AmpC-producing Klebsiella pneumoniae from burn patients. Therefore, the aim of this study was to determine the characterization of AmpC beta-lactamase among K. pneumoniae isolated from burn patients. Samples were collected from wound specimens of patients with burn injury from a burn hospital in Tehran during 18 months (March 2015 to August 2016)...
September 1, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28858302/proper-motion-age-dating-of-the-progeny-of-nova-scorpii-ad-1437
#19
M M Shara, K Iłkiewicz, J Mikołajewska, A Pagnotta, M F Bode, L A Crause, K Drozd, J Faherty, I Fuentes-Morales, J E Grindlay, A F J Moffat, M L Pretorius, L Schmidtobreick, F R Stephenson, C Tappert, D Zurek
'Cataclysmic variables' are binary star systems in which one star of the pair is a white dwarf, and which often generate bright and energetic stellar outbursts. Classical novae are one type of outburst: when the white dwarf accretes enough matter from its companion, the resulting hydrogen-rich atmospheric envelope can host a runaway thermonuclear reaction that generates a rapid brightening. Achieving peak luminosities of up to one million times that of the Sun, all classical novae are recurrent, on timescales of months to millennia...
August 30, 2017: Nature
https://www.readbyqxmd.com/read/28853852/graphene-coating-via-chemical-vapor-deposition-for-improving-friction-and-wear-of-gray-cast-iron-at-interfaces
#20
Khagendra Tripathi, Gobinda Gyawali, Soo Wohn Lee
This study reports the influence of CVD-graphene on the tribological performance of gray cast iron (GCI) from the internal combustion engine (ICE) cylinder liners by performing a ball-on-disk friction tests. The graphene-coated specimen exhibited a significant reduction (∼53%) of friction as compared to that of the uncoated specimen, whereas wear resistance increased by 2- and 5-fold regarding the wear of specimen and ball, respectively. Extremely low shear strength and highly lubricating nature of graphene contribute to the formation of a lubricative film between the sliding surfaces and decreases the interaction between surfaces in the dry environment...
September 11, 2017: ACS Applied Materials & Interfaces
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