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https://www.readbyqxmd.com/read/28724252/effect-of-operating-conditions-on-speciation-and-bioavailability-of-trace-metals-in-submerged-anaerobic-membrane-bioreactors
#1
Pham Minh Thanh, Balachandran Ketheesan, Yan Zhou, David C Stuckey
This study investigated the effect of changes in pH (7, 6.5 and 6), hydraulic retention time (HRT) (6h, 4h, and 2h), solids retention time (SRT) (100d and 25d) on the speciation of trace metals (TMs) in submerged anaerobic membrane bioreactors (SAMBRs). The results showed that the metal retention capacity of SAMBRs reduced when the pH, HRT and SRT were reduced i.e. up to 21.9%, 39.1%, and 17.1%, respectively, but it was also found that the speciation of these TMs generally shifted towards highly bioavailable fractions i...
July 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28723895/visible-light-driven-methane-formation-from-co2-with-a-molecular-iron-catalyst
#2
Heng Rao, Luciana C Schmidt, Julien Bonin, Marc Robert
Converting CO2 into fuel or chemical feedstock compounds could in principle reduce fossil fuel consumption and climate-changing CO2 emissions. One strategy aims for electrochemical conversions powered by electricity from renewable sources, but photochemical approaches driven by sunlight are also conceivable. A considerable challenge in both approaches is the development of efficient and selective catalysts, ideally based on cheap and Earth-abundant elements rather than expensive precious metals. Of the molecular photo- and electrocatalysts reported, only a few catalysts are stable and selective for CO2 reduction; moreover, these catalysts produce primarily CO or HCOOH, and catalysts capable of generating even low to moderate yields of highly reduced hydrocarbons remain rare...
July 17, 2017: Nature
https://www.readbyqxmd.com/read/28723783/novel-surgical-management-of-cyclodialysis-cleft-via-anterior-chamber-perfusion-case-report
#3
Jinfei Tang, Ergang Du, Jie Wang
RATIONALE: Cyclodialysis cleft is a relatively rare but severe condition with persistent ocular hypotony, which can cause morphologic changes and visual loss. Here we report a case of a traumatic cyclodialysis cleft that was successfully managed with direct cyclopexy via anterior chamber perfusion. During the operation, if there is aqueous humor flowing out of the deep scleral incision, the cleft is not closed, and surgery should continue until there is no aqueous outflow. PATIENT CONCERNS: A 66-year-old man was treated for severe blunt ocular trauma of the left eye and a resultant cyclodialysis cleft, lens subluxation, choroidal detachment and a cataract...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28723767/return-of-the-cadaver-key-role-of-anatomic-dissection-for-plastic-surgery-resident-training
#4
Swenn Maxence Krähenbühl, Paul Čvančara, Thomas Stieglitz, Raphaël Bonvin, Murielle Michetti, Marjorie Flahaut, Sébastien Durand, Lina Deghayli, Lee Ann Applegate, Wassim Raffoul
Successful Plastic Surgery Residency training is subjected to evolving society pressure of lower hourly work weeks imposed by external committees, labor laws, and increased public awareness of patient care quality. Although innovative measures for simulation training of surgery are appearing, there is also the realization that basic anatomy training should be re-enforced and cadaver dissection is of utmost importance for surgical techniques.In the development of new technology for implantable neurostimulatory electrodes for the management of phantom limb pain in amputee patients, a design of a cadaveric model has been developed with detailed steps for innovative transfascicular insertion of electrodes...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28723765/perioperative-management-of-intracardiac-leiomyomatosis-an-observational-cohort-study
#5
Jiaying Xu, Min Wei, Qi Miao, Bin Zhu, Chunhua Yu, Yuguang Huang
Intracardiac leiomyomatosis (ICLM) is a rare condition in which the benign tumor extends into the right heart chambers through inferior vena cava. The best surgical approach still remains unclear.We present a retrospective cohort of 36 patients diagnosed with ICLM in Peking Union Medical College Hospital between 2002 and 2016.The mean patient age was 44.5 (range 25-55) years. The clinical manifestations were various, including shortness of breath, chest tightness, edema of the lower extremities, palpitations, syncope, etc...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28723168/enhanced-room-temperature-oxygen-sensing-properties-of-laocl-sno2-hollow-spheres-by-uv-light-illumination
#6
Ya Xiong, Wenbo Lu, Degong Ding, Lei Zhu, Xiaofang Li, Cuicui Ling, Qingzhong Xue
In this paper, a facile and elegant Green Chemistry method for the synthesis of SnO2 based hollow spheres has been investigated. The influences of doping, crystallite morphology, and operating condition on the O2 sensing performances of SnO2 based hollow-sphere sensors were comprehensively studied. It was indicated that, compared with undoped SnO2, 10 at. % LaOCl-doped SnO2 possessed better O2 sensing characteristics owing to an increase of specific surface area and oxygen vacancy defect caused by LaOCl dopant...
May 26, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723085/catalytic-allylic-oxidation-of-cyclic-enamides-and-3-4-dihydro-2h-pyrans-by-tbhp
#7
Yang Yu, Ranad Humeidi, James R Alleyn, Michael P Doyle
Allylic oxidation of heteroatom substituted cyclic alkenes by tert-butyl hydroperoxide (70% TBHP in water) using catalytic dirhodium caprolactamate [Rh2(cap)4] forms enone products with a variety of 2-substituted cyclic enamides and 3,4-dihyro-2H-pyrans. These reactions occur under mild reaction conditions, are operationally convenient to execute, and are effective for product formation with as low as 0.25 mol% catalyst loading. With heteroatom stabilization of the intermediate allylic free radical two sites for oxidative product formation are possible, and the selectivity of the oxidative process varies with the heteroatom when R = H...
July 19, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28722489/treatment-of-die-punch-fractures-with-3d-printing-technology
#8
Chunhui Chen, Leyi Cai, Chuanxu Zhang, Jianshun Wang, Xiaoshan Guo, Yifei Zhou
PURPOSE: We evaluated the feasibility, accuracy and effectiveness of applying three-dimensional (3D) printing technology for preoperative planning for die-punch fractures. METHODS: A total of 107 patients who underwent die-punch fracture surgery were enrolled in the study. They were randomly divided into two groups: 52 cases in the 3D model group and 55 cases in the routine group. A 3D digital model of each die-punch fracture was reconstructed in the 3D group. The 3D digital model was imported to a 3D printer to build the full solid model...
July 19, 2017: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/28722466/assessing-the-generalizability-of-the-national-lung-screening-trial-comparison-of-stage-1-patients
#9
Nichole T Tanner, Lin Dai, Brett C Bade, Mulugeta Gebregziabher, Gerard A Silvestri
RATIONALE: The findings of the National Lung Screening Trial (NLST) is the basis for screening high risk individuals based on age and smoking history. While screening is covered for eligible Medicare beneficiaries, the generalizability of the NLST in the elderly population has been questioned. OBJECTIVE: Compare outcomes of patients diagnosed with stage 1 non-small cell lung cancer(NSCLC) in the NLST to a nationally representative cohort of elderly patients Methods: Analysis of SEER-Medicare and NLST datasets for stage 1 patients ages 65-74 Measurements and Main Results: Lung cancer-specific mortality, all-cause mortality, and 30-60-90 day treatment mortality were measured...
July 19, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28722119/sexual-selection-on-spontaneous-mutations-strengthens-the-between-sex-genetic-correlation-for-fitness
#10
Scott L Allen, Katrina McGuigan, Tim Connallon, Mark W Blows, Stephen F Chenoweth
A proposed benefit to sexual selection is that it promotes purging of deleterious mutations from populations. For this benefit to be realised, sexual selection, which is usually stronger on males, must purge mutations deleterious to both sexes. Here, we experimentally test the hypothesis that sexual selection on males purges deleterious mutations that affect both male and female fitness. We measured male and female fitness in two panels of spontaneous mutation-accumulation lines of the fly, Drosophila serrata, each established from a common ancestor...
July 19, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28722083/-a-perception-of-the-development-trend-of-radiological-t-staging-in-gastric-cancer-through-uicc-ajcc-8-th-edition
#11
Lei Tang
More and more emphases were put on pre-therapy staging following the promotion of multidisciplinary team(MDT) collaboration and individualized medicine in gastric cancer. However, the accuracy of traditional radiology staging system which applies mechanically pathological staging is not satisfactory during clinical practice, therefore, the objectivity of treatment decisions is affected. Under such conditions, the newly introduced staging system from Union for International Cancer Control/American Joint Committee on Cancer(UICC/AJCC)(8(th) edition) divided out an independent cTNM system for the first time, and summarized the application range, operation specification and staging criteria...
July 25, 2017: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/28722080/-a-surgery-oriented-classification-in-conversion-therapy-of-gastric-cancer
#12
Ziyu Li, Kan Xue, Jiafu Ji
Clinical practice showed that some advanced gastric cancer (AGC) patients achieved long-term survival after surgery, whereas some benefited from non-surgical treatment. In recent years, with the emergence of new drugs, diversity of treatment and development of multi-disciplinary team, the concept of conversion therapy comes into attention. Owing to diverse phenotypes with scattered cases, publications are mainly case reports or small sample studies from single centers, which makes it hard to acquire high-level evidence...
July 25, 2017: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/28721624/on-the-successful-use-of-a-simplified-model-to-simulate-the-succession-of-toxic-cyanobacteria-in-a-hypereutrophic-reservoir-with-a-highly-fluctuating-water-level
#13
Ali Fadel, Bruno J Lemaire, Brigitte Vinçon-Leite, Ali Atoui, Kamal Slim, Bruno Tassin
Many freshwater bodies worldwide that suffer from harmful algal blooms would benefit for their management from a simple ecological model that requires few field data, e.g. for early warning systems. Beyond a certain degree, adding processes to ecological models can reduce model predictive capabilities. In this work, we assess whether a simple ecological model without nutrients is able to describe the succession of cyanobacterial blooms of different species in a hypereutrophic reservoir and help understand the factors that determine these blooms...
July 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28721620/methane-biofiltration-in-the-presence-of-ethanol-vapor-under-steady-and-transient-state-conditions-an-experimental-study
#14
Milad Ferdowsi, Antonio Avalos Ramirez, Joseph Peter Jones, Michèle Heitz
Methane (CH4) removal in the presence of ethanol vapors was performed by a stone-based bed and a hybrid packing biofilter in parallel. In the absence of ethanol, a methane removal efficiency of 55 ± 1% was obtained for both biofilters under similar CH4 inlet load (IL) of 13 ± 0.5 gCH4 m(-3) h(-1) and an empty bed residence time (EBRT) of 6 min. The results proved the key role of the bottom section in both biofilters for simultaneous removal of CH4 and ethanol. Ethanol vapor was completely eliminated in the bottom sections for an ethanol IL variation between 1 and 11 gethanol m(-3) h(-1)...
July 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28721286/open-stone-surgery-a-still-in-use-approach-for-complex-stone-burden
#15
Özer Ural Çakici, Kemal Ener, Murat Keske, Serkan Altinova, Abdullah Erdem Canda, Mustafa Aldemir, Arslan Ardicoglu
INTRODUCTION: Urinary stone disease is a major urological condition. Endourologic techniques have influenced the clinical approach and outcomes. Open surgery holds a historic importance in the management of most conditions. However, complex kidney stone burden may be amenable to successful results with open stone surgery. In this article, we report our eighteen cases of complex urinary stone disease who underwent open stone removal. MATERIAL AND METHODS: A total of 1701 patients have undergone surgical treatment for urinary stone disease in our clinic between July 2012 and July 2016, comprising eighteen patients who underwent open stone surgery...
June 30, 2017: Central European Journal of Urology
https://www.readbyqxmd.com/read/28720795/symmetry-of-learning-rate-in-synaptic-plasticity-modulates-formation-of-flexible-and-stable-memories
#16
Youngjin Park, Woochul Choi, Se-Bum Paik
Spike-timing-dependent plasticity (STDP) is considered critical to learning and memory functions in the human brain. Across various types of synapse, STDP is observed as different profiles of Hebbian and anti-Hebbian learning rules. However, the specific roles of diverse STDP profiles in memory formation still remain elusive. Here, we show that the symmetry of the learning rate profile in STDP is crucial to determining the character of stored memory. Using computer simulations, we found that an asymmetric learning rate generates flexible memory that is volatile and easily overwritten by newly appended information...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28720405/persistent-cognitive-and-morphological-alterations-induced-by-repeated-exposure-of-adolescent-rats-to-the-abused-inhalant-toluene
#17
K M Braunscheidel, J T Gass, P J Mulholland, S B Floresco, J J Woodward
While thepsychoactive inhalant toluene causes behavioral effects similarto those produced by other drugs of abuse, the persistent behavioral and anatomical abnormalities induced by toluene exposure are not well known. To mimic human "binge-like" inhalant intoxication, adolescent, male Sprague-Dawley rats were exposed to toluene vapor (57000 ppm) twice daily for five consecutive days. These rats remained in their home cages until adulthood (P60), when they were trained in operant boxes to respond to a palatable food reward and then challenged with several different cognitive tasks...
July 15, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28720224/development-of-a-1-0-mm-id-temperature-assisted-focusing-precolumn-for-use-with-2-1-mm-id-columns
#18
Stephen R Groskreutz, Anthony R Horner, Stephen G Weber
On-column solute focusing is a simple and powerful method to decrease the influence of precolumn band spreading and increase the allowable volume injected increasing sensitivity. It relies on creating conditions so that the retention factor, k', is transiently increased during the injection process. Both solvent composition and temperature control can be used to effect solute focusing. In the case of temperature, the release of the transiently delayed solute band requires increasing the temperature rapidly and with a minimum of radial thermal gradients...
July 8, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28720220/application-of-ultrahigh-performance-liquid-chromatography-quadrupole-time-of-flight-mass-spectrometry-for-the-characterization-of-organic-aerosol-searching-for-naphthenic-acids
#19
Mahmoud M Yassine, Ewa Dabek-Zlotorzynska
Naphthenic acids (NAs) are naturally occurring constituents of hydrocarbon deposits (petroleum, oil sands bitumen, and crude oils), and present in any facilities that extract, process or use crude oil or bitumen for manufacturing. In the Athabasca oil sands region (AOSR) of Alberta, Canada, this diverse group of saturated acyclic, monocyclic, and polycyclic carboxylic acids is present in bitumen and in tailing ponds. Little is known about the occurrence of residual oil sands derived organic material, including NAs, in atmospheric particulate matter (PM)...
June 28, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28720184/human-performance-time-model-of-spacecraft-control-panel-operation-in-simulated-microgravity
#20
Shi Cao, Yijing Zhang, Yunhuan Guo, Shanguang Chen
BACKGROUND: Human performance modeling plays an important role in the design and management of human spaceflight missions. Previous studies reported that manual control task time increased in microgravity conditions. The current study aimed to find a modeling method that can quantify and predict the task time of spacecraft control panel operation in the simulated microgravity condition. METHODS: We proposed the application of a predetermined elemental task method together with an information processing time model to quantify both physical motion time and cognitive time...
August 1, 2017: Aerospace Medicine and Human Performance
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