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https://www.readbyqxmd.com/read/28930630/assessing-the-structure-and-stability-of-transmembrane-oligomeric-intermediates-of-an-%C3%AE-helical-toxin
#1
Rajat Desikan, Prabal K K Maiti, K Ganapathy Ayappa
Protein membrane interactions play an important role in our understanding of diverse phenomena ranging from membrane assisted protein aggregation to oligomerization and folding. Pore forming toxins (PFTs) form the primary vehicle for infection by several strains of bacteria. These proteins expressed in a water soluble form (monomers) bind to the target membrane (protomer) to form a transmembrane pore complex through a process of oligomerization. Based on the structure of the transmembrane domains, PFTs are broadly classified into β or α toxins...
September 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28930313/redistribution-of-valence-and-conduction-band-states-depending-on-the-method-of-modification-of-sio2-structure
#2
A S Konashuk, E O Filatova
The effect of introducing porosity and the insertion of methyl groups in SiO4 tetrahedra on the distribution of valence and conduction band states of SiO2 was studied using high-resolution near edge X-ray absorption fine structure spectroscopy (NEXAFS) and soft X-ray photoelectron spectroscopy (XPS). Alignment of NEXAFS spectra and valence band XPS spectra in a common energy scale was performed using binding energies of the initial levels obtained by XPS. It was established that the insertion of methyl groups into SiO4 tetrahedra leads to a significant shift of the top of the valence band EV to smaller binding energies due to the reduction of the electronegativity of the nearest surrounding neighbors of the Si atoms, while introducing porosity changes the position of EV only slightly...
September 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28930078/how-should-i-treat-recurrent-severe-paravalvular-leakage-after-successful-interventional-closure-of-a-symptomatic-paravalvular-leak-with-four-plug-devices-following-complicated-bioprosthetic-aortic-valve-replacement-the-importance-of-closely-monitoring-patients
#3
https://www.readbyqxmd.com/read/28930073/two-sides-to-every-story-the-trade-off-between-paravalvular-leakage-and-the-occurrence-of-conduction-disturbances-in-transcatheter-heart-valves
#4
Jan-Malte Sinning, Eberhard Grube
No abstract text is available yet for this article.
September 20, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28929354/analysis-of-influence-mechanism-of-energy-related-carbon-emissions-in-guangdong-evidence-from-regional-china-based-on-the-input-output-and-structural-decomposition-analysis
#5
Changjian Wang, Fei Wang, Xinlin Zhang, Haijun Deng
It is important to analyze the influence mechanism of energy-related carbon emissions from a regional perspective to effectively achieve reductions in energy consumption and carbon emissions in China. Based on the "energy-economy-carbon emissions" hybrid input-output analysis framework, this study conducted structural decomposition analysis (SDA) on carbon emissions influencing factors in Guangdong Province. Systems-based examination of direct and indirect drivers for regional emission is presented. (1) Direct effects analysis of influencing factors indicated that the main driving factors of increasing carbon emissions were economic and population growth...
September 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28929306/colorectal-anastomotic-leak-delay-in-reintervention-after-false-negative-computed-tomography-scan-is-a-reason-for-concern
#6
C C M Marres, A W H van de Ven, L G J Leijssen, P C M Verbeek, W A Bemelman, C J Buskens
BACKGROUND: Early detection of anastomotic leakage (AL) after colorectal surgery followed by timely reintervention is of crucial importance. The aim of this study was to investigate the accuracy of computed tomography (CT) imaging for AL and the effects of delay in reintervention after a false-negative CT. METHODS: All files from patients who had colorectal surgery with primary anastomoses between 2009 and 2014 were reviewed. The predictive value of CT scanning for AL was determined and correlated with short-term postoperative patient outcomes...
September 19, 2017: Techniques in Coloproctology
https://www.readbyqxmd.com/read/28929079/spontaneous-recurrent-csf-rhinorrhoea-a-rare-case-and-review-of-literature
#7
Nishit Shah, C E Deopujari, Sunita Chhapola Shukla
Cerebrospinal fluid (CSF) rhinorrhoea is the leakage of CSF through the communication between the subarachnoid space and the nasal cavity. Surgical repair is indicated in all cases of spontaneous leaks, recurrent leaks, leaks that do not stop after conservative management and cases with history of meningitis. We present a rare case of spontaneous (delayed onset post traumatic) CSF rhinorrhoea with multiple defect sites, which was treated with an endonasal endoscopic repair. The patient was asymptomatic for 9 years after surgery, and then presented with a spontaneous left frontal recess CSF leak, which was closed using endonasal approach...
September 2017: Indian Journal of Otolaryngology and Head and Neck Surgery
https://www.readbyqxmd.com/read/28928850/spiral-computed-tomography-evaluation-of-rabbit-vx2-hepatic-tumors-treated-with-20-khz-ultrasound-and-microbubbles
#8
Zhi-Yong Shen, Chun Liu, Ming-Feng Wu, Hai-Feng Shi, Yu-Feng Zhou, Wei Zhuang, Gan-Lin Xia
The aim of the present study was to explore the therapeutic effect of 20 kHz ultrasound (US) and microbubbles (MBs) on rabbit VX2 liver tumors by spiral computed tomography (CT) scanning. A total of 16 New Zealand rabbits with hepatic VX2 tumors were divided into four groups: Control, MB, low-frequency US and US + MB. The treatment effect was evaluated by spiral CT scanning prior to, during and following treatment (at 0 weeks and the end of 1 and 2 weeks). The tumor growth rate was recorded. The specimens of VX2 tumors were collected for histological examination and transmission electron microscopy (TEM)...
September 2017: Oncology Letters
https://www.readbyqxmd.com/read/28928400/inhibiting-p-fluorescens-biofilms-with-fluoropolymer-embedded-silver-nanoparticles-an-in-situ-spectroscopic-study
#9
M C Sportelli, E Tütüncü, R A Picca, M Valentini, A Valentini, C Kranz, B Mizaikoff, H Barth, N Cioffi
Surface colonization by microorganisms leads to the formation of biofilms, i.e. aggregates of bacteria embedded within a matrix of extracellular polymeric substance. This promotes adhesion to the surface and protects bacterial community, providing an antimicrobial-resistant environment. The inhibition of biofilm growth is a crucial issue for preventing bacterial infections. Inorganic nanoparticle/Teflon-like (CFx) composites deposited via ion beam sputtering demonstrated very efficient antimicrobial activity...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28928081/microrna-140-5p-attenuated-oxidative-stress-in-cisplatin-induced-acute-kidney-injury-by-activating-nrf2-are-pathway-through-a-keap1-independent-mechanism
#10
Weitang Liao, Zongjie Fu, Yanfang Zou, Dan Wen, Hongkun Ma, Fangfang Zhou, Yongxi Chen, Mingjun Zhang, Wen Zhang
Oxidative stress was predominantly involved in the pathogenesis of acute kidney injury (AKI). Recent studies had reported the protective role of specific microRNAs (miRNAs) against oxidative stress. Hence, we investigated the levels of miR140-5p and its functional role in the pathogenesis of Cisplatin induced AKI. A mice Cisplatin induced-AKI model was established. We found that miR-140-5p expression was markedly increased in mice kidney. Bioinformatics analysis revealed nuclear factor erythroid 2-related factor (Nrf2) was a potential target of miR-140-5p, We demonstrated that miR-140-5p did not affect Kelch-like ECH-associated protein 1 (Keap1) levels but directly targeted the 3'-UTR of Nrf2 mRNA and played a positive role in the regulation of Nrf2 expression which was comfirmed by luciferase activity assay and western blot...
September 16, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28927375/effects-of-lubrication-on-air-sealing-performance-of-a-pediatric-cuffed-tracheal-tube
#11
Hiroko Nishioka, Yutaka Usuda, Go Hirabayashi, Koichi Maruyama, Tomio Andoh
BACKGROUND: Lubrication of cuffed tracheal tubes (CTTs) reduces liquid leakage. However, it is not clear how cuff lubrication influences air leakage. We aimed to test the hypothesis that pretreatment with K-Y jelly, a water-soluble lubricant, would improve the air-sealing performance of pediatric CTTs in a model study. METHODS: We placed Parker Flex-Tip™ CTT with 4.0- and 5.0-mm internal diameter (ID) into a tracheal model with 9- and 12-mm ID. The tracheal model was connected to a test lung ventilated in pressure control mode...
September 19, 2017: BMC Anesthesiology
https://www.readbyqxmd.com/read/28927340/risk-factors-of-perioperative-morbimortality-after-laparoscopic-sleeve-gastrectomy-a-club-coelio-multicenter-study
#12
B Tulelli, P Loi, E van Vyve, H Johanet, G Fromont, A Dabrowski, A Piquart, T Delaunay, P Ledaguenel, B Navez, F Maisonnette, M Lepere, T Dugué, V Demoor, B Bokobza, Jp Staudt, P Hauters, P Malvaux, J Closset
OBJECTIVES: Postoperative complications after Laparoscopic sleeve gastrectomy (LSG) can dramatically compromise patient's outcome. The aim of this study is to analyze the per- and postoperative short-term outcomes after LSG and to assess predictive risk factors of complications. METHODS: The study group consisted of 790 patients (610 women and 180 men) who underwent LSG In 2014. All interventions were performed by 18 experienced surgeons members of the Club Coelio...
September 19, 2017: Acta Chirurgica Belgica
https://www.readbyqxmd.com/read/28927211/a-pivotal-randomized-clinical-trial-evaluating-the-safety-and-effectiveness-of-a-novel-hydrogel-dural-sealant-as-an-adjunct-to-dural-repair
#13
Michael J Strong, G Alexander West, Henry Woo, Daniel E Couture, John A Wilson, Lorenzo F Munoz, Charles L Rosen, Jeremy D Greenlee, Harry R van Loveren, Mark Iantosca, Clinton J Baird, Mark Smith, Matt McGirt, Jonathan Parish, Anthony L Asher
BACKGROUND: A watertight dural repair is critical to minimizing the risk of postoperative complications secondary to cerebrospinal fluid (CSF) leaks. OBJECTIVE: To evaluate the safety and efficacy of a novel hydrogel, Adherus Dural Sealant, when compared with control, DuraSeal Dural Sealant System, as an adjunct to standard methods of dural repair. METHODS: In this 17-center, prospective, randomized clinical trial designed as a noninferiority, single-blinded study, 124 patients received Adherus Dural Sealant (test sealant) and 126 received DuraSeal (control)...
April 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28926797/experimental-study-of-radiation-dose-rate-at-different-strategic-points-of-the-baec-triga-research-reactor
#14
M Ajijul Hoq, M A Malek Soner, M A Salam, M M Haque, Salma Khanom, S M Fahad
The 3MW TRIGA Mark-II Research Reactor of Bangladesh Atomic Energy Commission (BAEC) has been under operation for about thirty years since its commissioning at 1986. In accordance with the demand of fundamental nuclear research works, the reactor has to operate at different power levels by utilizing a number of experimental facilities. Regarding the enquiry for safety of reactor operating personnel and radiation workers, it is necessary to know the radiation level at different strategic points of the reactor where they are often worked...
September 9, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28925545/methane-delays-the-senescence-and-browning-in-daylily-buds-by-re-established-redox-homeostasis
#15
Huali Hu, Dan Liu, Pengxia Li
BACKGROUND: During the postharvest senescence of fruits and vegetables, redox imbalance occurs. Although the release of methane (CH4 ) has been observed for a long time and its antioxidant properties have recently been demonstrated in animals and plants, the corresponding physiological role of CH4 in regulating plant senescence has not yet been elucidated. RESULTS: Here, our results indicate that the postharvest deterioration of daylily buds during storage is greatly ameliorated by the exogenous application of CH4 , particularly in the inhibition of tissue browning...
September 19, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28924363/thrombospondin-1-gene-deficiency-worsens-the-neurological-outcomes-of-traumatic-brain-injury-in-mice
#16
Chongjie Cheng, Zhanyang Yu, Song Zhao, Zhengbu Liao, Changhong Xing, Yinghua Jiang, Yong-Guang Yang, Michael J Whalen, Eng H Lo, Xiaochuan Sun, Xiaoying Wang
Background: Thrombospondin-1 (TSP-1) is an extracellular matrix protein that plays multiple physiological and pathophysiological roles in the brain. Experimental reports suggest that TSP-1 may have an adverse role in neuronal function recovery under certain injury conditions. However, the roles of TSP-1 in traumatic brain injury (TBI) have not been elucidated. In this study we for the first time investigated the roles of TSP-1 in a controlled cortical impact (CCI) model of TBI in TSP-1 knockout (TSP-1 KO) and wild type (WT) mice...
2017: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/28924349/autophagy-promotes-degradation-of-polyethyleneimine-alginate-nanoparticles-in-endothelial-progenitor-cells
#17
Guo-Dong Wang, Yu-Zhen Tan, Hai-Jie Wang, Pei Zhou
Polyethyleneimine (PEI)-alginate (Alg) nanoparticle (NP) is a safe and effective vector for delivery of siRNA or DNA. Recent studies suggest that autophagy is related to cytotoxicity of PEI NPs. However, contribution of autophagy to degradation of PEI-Alg NPs remains unknown. CD34(+)VEGFR-3(+) endothelial progenitor cells isolated from rat bone marrow were treated with 25 kDa branched PEI modified by Alg. After treatment with the NPs, morphological changes and distribution of the NPs in the cells were examined with scanning and transmission electron microscopies...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28924137/primary-closure-following-laparoscopic-common-bile-duct-exploration-combined-with-intraoperative-choledochoscopy-and-d-j-tube-drainage-for-treating-choledocholithiasis
#18
Miao Yu, Huanzhou Xue, Quan Shen, Xiao Zhang, Ke Li, Meng Jia, Jiangkun Jia, Jian Xu
BACKGROUND This study aimed to assess the clinical short-term results of a primary closure following laparoscopic common bile duct exploration (LCBDE) combined with intraoperative choledochoscopy and D-J tube drainage for choledocholithiasis treatment. MATERIAL AND METHODS Twenty-five patients (14 women and 11 men) who underwent LCBDE with primary duct closure and D-J tube drainage for choledocholithiasis were retrospectively enrolled. The D-J tube (4.7F×14 cm) was removed using a duodenoscope if there was no bile leakage...
September 19, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28924095/a-comparative-study-of-reference-dosimetries-in-japan-and-canada
#19
Toru Kawachi, Tetsurou Katayose, Takumi Kodama, Ryouhei Miyasaka, Morihito Shimizu, Hidetoshi Saitoh
In Japan and North America, different dosimetry protocols have been implemented to determine the absorbed dose to water: JSMP Standard Dosimetry 12 and AAPM TG-51 addendum. In this study, Japanese and Canadian reference dosimetries for high energy photon beams were compared theoretically, and then they were verified experimentally. We estimated the theoretical differences of the ion recombination correction factors, the leakage correction factors, the radial dose distribution correction factors, the calibration factors, the beam quality correction factors and the absorbed dose to water...
2017: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28924069/-a-case-of-transoral-penetrating-head-injury-from-a-crossbow-fired-arrow
#20
Naoto Nakamura, Yuichi Fujita, Satoshi Nakamizo, Yoshio Sakagami, Ken Okazaki, Kouta Kida
Penetrating head injuries are extremely rare in Japan. The authors describe a case involving a penetrating head injury from an arrow fired from a crossbow. A 52-year-old man who had shot himself transorally in a suicide attempt was admitted to the authors' hospital. On admission, he was conscious and exhibited no neurological deficits. The end of the arrow was visible inside his oral cavity. Computed tomography revealed the arrow had penetrated the right cerebellum and occipital lobe, resulting in a very small hematoma...
September 2017: No Shinkei Geka. Neurological Surgery
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