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https://www.readbyqxmd.com/read/28735499/an-evaluation-of-the-reliability-of-the-characterization-of-the-porous-structure-of-activated-carbons-based-on-incomplete-nitrogen-adsorption-isotherms
#1
Mirosław Kwiatkowski, Bassim H Hameed
The paper presents the results of research devoted to reliability evaluation of the analysis of results of the porous structure of activated carbons based on incomplete nitrogen adsorption isotherms using the BET, t-plot, and NLDFT methods, as well as the LBET method comprising the unique numerical fast multivariant procedure of adsorption system identification. The research involved the application of the nitrogen adsorption isotherms obtained for five samples of activated carbons produced from waste materials of organic origin by way of chemical activation with potassium hydroxide, sodium hydroxide, and potassium carbonate with the use of microwave heating...
August 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28734648/minimally-invasive-treatment-of-class-4-invasive-cervical-resorption-with-internal-approach-a%C3%A2-case-series
#2
Avi Shemesh, Joe Ben Itzhak, Michael Solomonov
Invasive cervical resorption (ICR) is a type of external resorption that can involve the coronal, middle, and apical parts of the root in its advanced stages. The diagnosis and treatment of ICR depend on the extent of the resorption into the dentin. The treatment of advanced ICR is challenging, and these teeth have poor prognoses. This article describes 4 cases of class 4 ICR diagnosed by using cone-beam computed tomography and treated with a minimally invasive internal approach with sodium hypochlorite irrigation and calcium hydroxide dressing...
July 19, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28733000/surface-modification-of-tio2-particles-with-the-sono-assisted-exfoliation-method
#3
Eakkasit Thasirisap, Naratip Vittayakorn, Panpailin Seeharaj
This study reported a novel approach to optimize the photocatalytic property of anatase TiO2 particles by delaminating their outer surface into highly reactive nanosheets via the sono-assisted exfoliation method. To modify the surface, TiO2 particles were dispersed in aqueous solution of 10M sodium hydroxide (NaOH) and tetrabutylammonium hydroxide (TBAOH), followed by irradiation with high intensity ultrasonic wave (20kHz, 150W/cm(2)) for 60min. The intercalation and exfoliation processes were accelerated with the driving force of the extreme acoustic cavitation leading to the delamination of TiO2 nanosheets with highly reactive exposed {001} facets from the mother TiO2 crystals...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28728361/influence-of-barley-grain-treated-with-alkaline-compounds-or-organic-extracts-on-ex-vivo-site-and-extent-of-digestion-of-starch
#4
Reza Naseroleslami, Mohsen Danesh Mesgaran, Abdolmansour Tahmasbi, Alireza Vakili, Seyed Hadi Ebrahimi
Objective: Two ex vivo experiments were conducted to verify the effect of barley grain (Nusrat cultivar) treated with alkaline compounds (AC) including alum, ammonium, and sodium hydroxide or cation-exchanged organic extracts (OE) prepared from alfalfa hay, sugar beet pulp and Ulva Fasciata, on extent and digestion site of starch. Methods: In the first study, the in vitro first order disappearance kinetic parameters of dry matter (DM), crude protein (CP) and starch were estimated using a non-linear model (D(t)= D(i)...
June 27, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28723203/multicolor-functional-carbon-dots-via-one-step-refluxing-synthesis
#5
Ting-Yi Wang, Chong-You Chen, Chang-Ming Wang, Ying Zi Tan, Wei-Ssu Liao
Carbon dots are admirable fluorescent nanomaterials due to their low cost, high photostability, excellent biocompatibility, and environmental friendliness. Most conventional carbon dot fabrication approaches produce single-colored fluorescent material in the preparation process; different methods are therefore required to synthesize distinct carbon dots for specific optical applications. In this study, carbon dots carrying different emission colors are prepared through a one-step refluxing process. The emission of these materials can be well-tuned by sodium hydroxide content in the precursor solution...
March 24, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723077/comparison-of-methods-to-release-mucin-type-o-glycans-for-glycomic-analysis
#6
Yukinobu Goso, Tsukiko Sugaya, Kazuhiko Ishihara, Makoto Kurihara
Mucin-type O-glycans (O-glycans) are one of the most common glycans attached to proteins. To develop an optimized glycomic analysis protocol, O-glycans were released from glycoproteins using hydrazine, ammonia, or sodium hydroxide treatment, followed by hydrophilic interaction liquid chromatography to evaluate O-glycan release. We found that porcine gastric mucin or bovine fetuin treated at 60°C for 6 h with hydrazine gas in the presence of malonic acid yielded O-glycans with only a small amount of degraded, so-called "peeled" products...
July 19, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28692923/permeability-recovery-of-fouled-forward-osmosis-membranes-by-chemical-cleaning-during-a-long-term-operation-of-anaerobic-osmotic-membrane-bioreactors-treating-low-strength-wastewater
#7
Xinhua Wang, Taozhan Hu, Zhiwei Wang, Xiufen Li, Yueping Ren
Anaerobic osmotic membrane bioreactor (AnOMBR) has gained increasing interests in wastewater treatment owing to its simultaneous recovery of biogas and water. However, the forward osmosis (FO) membrane fouling was severe during a long-term operation of AnOMBRs. Here, we aim to recover the permeability of fouled FO membranes by chemical cleaning. Specifically speaking, an optimal chemical cleaning procedure was searched for fouled thin film composite polyamide FO (TFC-FO) membranes in a novel microfiltration (MF) assisted AnOMBR (AnMF-OMBR)...
July 5, 2017: Water Research
https://www.readbyqxmd.com/read/28688320/stabilization-of-lead-in-an-alkali-activated-municipal-solid-waste-incineration-fly-ash-pyrophyllite-based-system
#8
Kenji Shiota, Takafumi Nakamura, Masaki Takaoka, Siti Fatimah Aminuddin, Kazuyuki Oshita, Takashi Fujimori
This work focuses on the stabilization and speciation of lead (Pb) in a composite solid produced from an alkali-activated municipal solid waste incineration fly ash (MSWIFA)-pyophyllite-based system. The solid product was synthesized after mixtures of raw materials (dehydrated pyrophyllite, MSWIFA, 14 mol/L aqueous sodium hydroxide, and sodium silicate solution) were cured at 105 °C for 24 h. The product could reduce the leaching of Pb and the Pb concentration in the leachate was 7.0 × 10(-3) using the Japanese leaching test and 9...
July 5, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28688047/assessment-of-antioxidant-and-antimicrobial-properties-of-lignin-from-corn-stover-residue-pretreated-with-low-moisture-anhydrous-ammonia-and-enzymatic-hydrolysis-process
#9
Mingming Guo, Tony Jin, Nhuan P Nghiem, Xuetong Fan, Phoebe X Qi, Chan Ho Jang, Lingxiao Shao, Changqing Wu
Lignin accounts for 15-35% of dry biomass materials. Therefore, developing value-added co-products from lignin residues is increasingly important to improve the economic viability of biofuel production from biomass resources. The main objective of this work was to study the lignin extracts from corn stover residue obtained from a new and improved process for bioethanol production. Extraction conditions that favored high lignin yield were optimized, and antioxidant and antimicrobial activities of the resulting lignin were investigated...
July 7, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28686412/field-assisted-splitting-of-pure-water-based-on-deep-sub-debye-length-nanogap-electrochemical-cells
#10
Yifei Wang, S R Narayanan, Wei Wu
Owing to the low conductivity of pure water, using an electrolyte is common for achieving efficient water electrolysis. In this paper, we have fundamentally broken through this common sense by using deep-sub-Debye-length nanogap electrochemical cells to achieve efficient electrolysis of pure water (without any added electrolyte) at room temperature. A field-assisted effect resulted from overlapped electrical double layers can greatly enhance water molecules ionization and mass transport, leading to electron-transfer limited reactions...
July 11, 2017: ACS Nano
https://www.readbyqxmd.com/read/28685188/evaluation-of-mycotube-a-modified-version-of-lowenstein-jensen-lj-medium-for-efficient-recovery-of-mycobacterium-tuberculosis-mtb
#11
R Nambiar, S Chatellier, N Bereksi, A van Belkum, N Singh, B Barua, A Shetty, C Rodrigues
Timely diagnosis of tuberculosis (TB), caused by Mycobacterium tuberculosis (MTB), is only achieved for ~58% cases. An improved, accurate, time- and cost-effective method for bacteriological confirmation of MTB is necessary. We evaluated Mycotube, a new variant of Lowenstein-Jensen (LJ) culture medium, by comparing it with Mycobacterium Growth Indicator Tube (MGIT) 960 (gold standard), local LJ, and bioMérieux LJ-T in terms of isolation rate and time-to-growth. Pulmonary and extra-pulmonary samples from treatment-naïve suspects (n = 207) were decontaminated by the N-acetyl-L-cysteine-sodium hydroxide method and used to inoculate the four media...
July 6, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28683179/capillary-electrophoresis-with-capacitively-coupled-contactless-conductivity-detection-method-development-and-validation-for-the-determination-of-azithromycin-clarithromycin-and-clindamycin
#12
Prasanta Paul, Tom Duchateau, Cari Griend, Erwin Adams, Ann Van Schepdael
A capillary electrophoresis with capacitively coupled contactless conductivity detection based method for the assay of azithromycin, clarithromycin and clindamycin was optimized and validated in this study. A buffer solution of 20 mM 2-(N-morpholino) ethane sulfonic acid, 40 mM l-histidine and 0.6 mM cetyltrimethylammonium bromide (pH 6.39) was used for the electrophoresis. An uncoated, bare-fused silica capillary (total length 60 cm, effective length 32 cm, 75 μm i.d.) was used at 25°C. The sample was injected hydrodynamically at 0...
July 6, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28678472/enriching-silver-nanocrystals-with-a-second-noble-metal
#13
Yiren Wu, Xiaojun Sun, Yin Yang, Jumei Li, Yun Zhang, Dong Qin
Noble-metal nanocrystals have received considerable interests owing to their fascinating properties and promising applications in areas including plasmonics, catalysis, sensing, imaging, and medicine. As demonstrated by ample examples, the performance of nanocrystals in these and related applications can be augmented by switching from monometallic to bimetallic systems. The inclusion of a second metal can enhance the properties and greatly expand the application landscape by bringing in new capabilities. Seeded growth offers a powerful route to bimetallic nanocrystals...
July 5, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28675589/determination-of-methyl-methanesulfonate-and-ethyl-methanesulfonate-in-methanesulfonic-acid-by-derivatization-followed-by-high-performance-liquid-chromatography-with-ultraviolet-detection
#14
Jie Zhou, Jie Xu, Xiangyuan Zheng, Wenyuan Liu, Feng Zheng
Methanesulfonic acid is routinely used in the manufacture of pharmaceuticals but can contain potentially genotoxic impurities such as methyl methanesulfonate and ethyl methanesulfonate. The aim of this study was to develop a simple high-performance liquid chromatography with ultraviolet detection method for determining methyl methanesulfonate and ethyl methanesulfonate in methanesulfonic acid. Samples (250 mg) in water/acetonitrile (200 μL) were first combined with 10.0 mol/L sodium hydroxide solution (270 μL)...
July 4, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28673494/partial-pulpotomy-in-mature-permanent-teeth-with-clinical-signs-indicative-of-irreversible-pulpitis-a-randomized-clinical-trial
#15
Nessrin A Taha, Mohammad A Khazali
INTRODUCTION: This study aimed to assess the outcome of partial pulpotomy using mineral trioxide aggregate (MTA) compared with calcium hydroxide (CH) in mature cariously exposed permanent molars. METHODS: Fifty permanent molar teeth with carious exposures in 50 patients >20 years old were included. Preoperative pulpal and periapical diagnosis was established based on a history of presenting pain, results of cold testing, and radiographic findings. After informed consent, the tooth was anesthetized, isolated via a dental dam, and disinfected with 5% sodium hypochlorite before caries excavation...
June 30, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28672264/synthesis-of-dodecylamine-functionalized-graphene-quantum-dots-and-their-application-as-stabilizers-in-an-emulsion-polymerization-of-styrene
#16
Wang Xuan, Li Ruiyi, Li Zaijun, Liu Junkang
Pickering emulsions have attracted considerable interest due to their potential applications in many fields, such as the food, pharmaceutical, petroleum and cosmetics industries. The study reports the synthesis of dodecylamine-functionalized graphene quantum dots (d-GQDs) and their implementation as stabilizers in an emulsion polymerization of styrene. First, d-GQDs are prepared by thermal pyrolysis of citric acid and dodecylamine in 0.1M ammonium hydroxide. The resulting d-GQDs consist of small graphene sheets with abundant amino, carboxyl, acylamino, hydroxyl and alkyl chains on the edge...
June 27, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28672227/pyrimethanil-degradation-by-photo-fenton-process-influence-of-iron-and-irradiance-level-on-treatment-cost
#17
A Cabrera Reina, S Miralles-Cuevas, J L Casas López, J A Sánchez Pérez
This study evaluates the combined effect of photo-catalyst concentration and irradiance level on photo-Fenton efficiency when this treatment is applied to industrial wastewater decontamination. Three levels of irradiance (18, 32 and 46W/m(2)) and three iron concentrations (8, 20 and 32mg/L) were selected and their influence over the process studied using a raceway pond reactor placed inside a solar box. For 8mg/L, it was found that there was a lack of catalyst to make use of all the available photons. For 20mg/L, the treatment always improved with irradiance indicating that the process was photo-limited...
June 30, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28660962/reinforcement-of-natural-rubber-latex-using-lignocellulosic-nanofibers-isolated-from-spinifex-grass
#18
Alireza Hosseinmardi, Pratheep K Annamalai, Lianzhou Wang, Darren Martin, Nasim Amiralian
Reinforcement of natural rubber (NR) using nanofillers often results in an enhancement of the tensile strength, but at the expense of elongation at break and toughness. In this study, with the objective of strengthening NR without compromising its compliance, we investigate the reinforcement efficiency of a series of cellulose nanofibers (CNF) with variations in residual hemicellulose, lignin and therefore surface chemistry. Different types of high aspect ratio CNF isolated from Triodia pungens (T. pungens), an Australian arid grass commonly known as spinifex, were added at 0...
July 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28656924/comparison-of-intracoronal-bleaching-methods-on-teeth-discolored-by-different-antibiotic-pastes
#19
E Iriboz, B A Öztürk, S Körklü, B Tarcin, Y G Berker, H S Öveçoğlu
AIM: To compare the bleaching efficacy of sodium perborate with different activation methods on crowns discolored by two different antibiotic pastes. MATERIALS AND METHODS: Eighty-five extracted human incisors were prepared to size #30 using ProTaper rotary instruments. After chemomechanical preparation and irrigation procedures, the specimens received triple antibiotic paste (TAP, n = 40), minocycline paste (MP, n = 40), or calcium hydroxide (n = 5, control group) and coronally sealed with temporary filling material...
June 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28653756/a-zinc-oxide-modified-hydroxyapatite-based-cement-facilitated-new-crystalline-stoichiometric-and-amorphous-apatite-precipitation-on-dentine
#20
M Toledano, M C Pérez-Álvarez, F S Aguilera, E Osorio, I Cabello, M Toledano-Osorio, R Osorio
AIM: To evaluate the remineralization ability of two endodontic sealer cements. METHODOLOGY: Mid-coronal dentine surfaces were subjected to: i) 37% phosphoric acid (PA) or ii) 0.5 M ethylenediaminetetraacetic acid (EDTA) conditioning prior to the application of two experimental hydroxyapatite-based cements, containing sodium hydroxide (calcypatite) or zinc oxide (oxipatite), respectively. Samples were stored in simulated body fluid for 24 h or 21 d. Remineralization of the dentine surfaces were studied by Raman spectroscopy (mapping with K-means cluster and hierarchical cluster analysis) was undertaken were done...
June 27, 2017: International Endodontic Journal
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