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https://www.readbyqxmd.com/read/28549296/formation-mechanism-of-%C3%AE-lactalabumin-oleic-acid-complex-characterized-by-2d-correlation-analysis
#1
Yeonju Park, Yeseul Kim, Yujeong Park, Sila Jin, Hoon Hwang, Young Mee Jung
Partially unfolded α-lactalbumin (ALA) forms a complex with oleic acid (OA) that exhibits cytotoxic activity. In this study, for the first time, the pH-induced formation mechanism for ALA/OA complexes with two different molar ratios was investigated at the molecular level. For a deeper understanding of the formation mechanism of the two different ALA/OA complexes with decreasing pH, principal component analysis (PCA) and two-dimensional (2D) correlation spectroscopy were used to examine the pH-dependent IR spectra of ALA/OA complexes...
May 17, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28548670/oxocomplexes-of-u-vi-with-8-hydroxyquinoline-5-sulfonate-in-solution-structural-studies-and-photophysical-behaviour
#2
M Luísa Ramos, Licínia L G Justino, Rui Barata, Telma Costa, Bernardo A Nogueira, Rui Fausto, Hugh D Burrows
Multinuclear ((1)H and (13)C) NMR, and Raman spectroscopy, combined with DFT calculations, provide detailed information on the complexation between U(vi) oxoions and 8-hydroxyquinoline-5-sulfonate (8-HQS) in aqueous solution. Over the concentration region studied, U(vi) oxoions (uranyl ions) form one dominant complex with 8-HQS in water in the pH range 3-6, a mononuclear 1 : 2 (metal : ligand) complex, with the metal centre (UO2(2+)) coordinated to two 8-HQS ligands, together with one or more water molecules...
May 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28547776/anatomical-relationship-of-maxillary-posterior-teeth-with-the-sinus-floor-and-buccal-cortex
#3
J K Jang, S W Kwak, J H Ha, H C Kim
This study aimed to evaluate the possibility of root fenestration or oroantral communication by evaluating the distance from root apex to the sinus floor and buccal cortex in maxillary posterior teeth by using cone-beam computed tomography (CBCT) images. The study included 2,182 roots of the maxillary posterior teeth from 219 patients after reviewing CBCT images of 462 patients according to the location of roots by two endodontists. The distances from each root apex to the maxillary sinus floor and buccal and palatal cortices were evaluated according to sex and age, and the mean values were compared by one-way analysis of variance and Mann-Whitney U test...
May 26, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28547749/nhc-nih-catalyzed-intermolecular-regio-and-diastereoselective-cross-hydroalkenylations-of-endocyclic-dienes-with-a-olefins
#4
Xiaoyan Lian, Weihao Chen, Liang Dang, Yuchen Li, Chun Yu Ho
Highly selective cross-hydroalkenylation of endocyclic-1,3-dienes at the least substituted site with a-olefins was achieved by set of neutral NHC-Ni(II)H(OTf), and by cationic Ni(II) catalysts with novel NHC structure. Under the heteroatom assistance, skipped dienes were obtained in good yield by using as low as equal molar amount of substrate pairs and 2-5 mol% catalyst. A rare 4,3- product selectivity (i.e., H at C4 and alkenyl group at C3 of diene) was observed, which is different from known dimerizations of a-olefins with both acyclic Co and Fe systems...
May 26, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28547659/quiescent-adult-stem-cells-in-murine-teeth-are-regulated-by-shh-signaling
#5
Yuko Ishikawa, Mitsushiro Nakatomi, Hiroko Ida-Yonemochi, Hayato Ohshima
The mechanisms regulating the maintenance of quiescent adult stem cells in teeth remain to be fully elucidated. Our aim is to clarify the relationship between BrdU label-retaining cells (LRCs) and sonic hedgehog (Shh) signaling in murine teeth. After prenatal BrdU labeling, mouse pups were analyzed during postnatal day 1 (P1) to week 5 (P5W). Paraffin sections were processed for immunohistochemistry for BrdU, Sox2, Gli1, Shh, Patched1 (Ptch1) and Ki67 and for in situ hybridization for Shh and Ptch1. Dense LRCs, Gli1-(+) cells and Ptch1-(+) cells were co-localized in the outer enamel epithelium of the apical bud and apical dental papilla of incisors...
May 26, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28547078/infiltrative-local-anesthesia-with-articaine-is-equally-as-effective-as-inferior-alveolar-nerve-block-with-lidocaine-for-the-removal-of-erupted-molars
#6
J Venkat Narayanan, Prashanthi Gurram, Radhika Krishnan, Veerabahu Muthusubramanian, V Sadesh Kannan
AIM: The aim of this study is to assess the efficacy of 4% articaine with 1:100,000 adrenaline given as buccal and lingual infiltration in adult patients undergoing erupted mandibular first and second molar teeth extraction versus inferior alveolar nerve block technique using 2% lignocaine with 1:80,000 adrenaline. MATERIALS AND METHODS: A total of 100 patients undergoing extraction of mandibular posterior teeth were divided into two equally matched groups for the study, out of which 50 patients were given 4% articaine with 1:100,000 adrenaline as buccal and lingual infiltration and 50 patients were given 2% lignocaine with 1:80,000 adrenaline using classic direct inferior alveolar nerve block with lingual and buccal nerve block...
May 25, 2017: Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28546960/microshear-bond-strength-of-nano-bond-adhesive-containing-nanosized-aluminum-trioxide-particles
#7
Yousef Mohammed Althomali, Mohamed Ismail Ebrahim
OBJECTIVES: The present study was conducted to evaluate the effect of nanosized aluminum trioxide (Al2O3) particles when added to the Nano-Bond adhesive system and its effect on the microshear bond strength of nanocomposite resin to dentin. MATERIALS AND METHODS: A newly developed adhesive (Nano-Bond) and one type of light-cured resin restorative material (nanocomposite resin) were used in this study. The occlusal surfaces of extracted human molar teeth were ground perpendicular to the long axis of each tooth to expose a flat dentin surface...
April 2017: Journal of Orthodontic Science
https://www.readbyqxmd.com/read/28546841/the-effect-of-cyclodextrin-complexation-on-the-solubility-and-photostability-of-nerolidol-as-pure-compound-and-as-main-constituent-of-cabreuva-essential-oil
#8
Joyce Azzi, Pierre-Edouard Danjou, David Landy, Steven Ruellan, Lizette Auezova, Hélène Greige-Gerges, Sophie Fourmentin
Nerolidol (Ner), a major component of many plant essential oils, is known for its various biological properties. However, the low solubility of Ner in water and its susceptibility to degradation limit its application. The aim of our study was to improve the solubility and photostability of Ner through its encapsulation in different cyclodextrins (CDs). The formation constants of cis-, trans-Ner and their commercial mixture with various CDs (α-CD, β-CD, γ-CD, HP-β-CD, RAMEB, CRYSMEB and SBE-β-CD) were determined by phase solubility studies and confirmed by the spectral displacement UV-visible method...
2017: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28546716/complete-molar-pregnancy-in-postmenopausal-woman
#9
Ahmed Samy El-Agwany, Helmy Abdelsattar Rady, Hassan Mansour Hegab
Gestational trophoblastic disease spectrum ranges from benign hydatidiform mole to trophoblastic malignancy (placental site trophoblastic tumor and choriocarcinoma). Benign gestational trophoblastic disease occurs in women of reproductive age and is extremely rare in postmenopausal women. We describe a case of complete vesicular mole in a 55-year-old postmenopausal woman complaining of postmenopausal bleeding. To our knowledge, our case represents one of the rare descriptions in the world literature of a benign complete hydatidiform mole in a postmenopausal woman...
June 2017: Indian Journal of Surgical Oncology
https://www.readbyqxmd.com/read/28546594/patient-safety-reducing-the-risk-of-wrong-tooth-extraction
#10
P Cullingham, A Saksena, M N Pemberton
Over recent years there has been an increased emphasis on improving patient safety in all branches of medicine, with reducing wrong tooth extraction being a priority in dentistry. The true incidence of wrong tooth extraction is unknown but it is considered an avoidable harm and is a significant source of dental litigation. Interventions to reduce wrong tooth extraction include educational programmes encompassing human factor training, patient assisted identification, the use of checklists, marking of surgical sites and implementation of patient safety guidelines...
May 26, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28545870/strain-transfer-behavior-of-different-planning-options-for-mandibular-single-molar-replacement
#11
Eduardo Bortolas de Carvalho, Paulo Eduardo Herbst, Adriana Cláudia Lapria Faria, Ricardo Faria Ribeiro, Priscila Paganini Costa, Rodrigo Tiossi
STATEMENT OF PROBLEM: The loss of the first molar and second premolar could lead to mesial movement of the second molar, thus limiting the restoration space for the 2 missing teeth. Placement of a larger first molar is a common choice, but the best implant number and position option remain controversial. PURPOSE: The purpose of this in vitro study was to test different planning options for replacing the mandibular first molar. MATERIAL AND METHODS: Two polyoxymethylene models simulated first molar edentulous spaces of 11 mm (conventional size first molar: control group) and 14 mm (enlarged first molar: all remaining groups other than control)...
May 23, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28545657/durability-of-a-low-shrinkage-tegdma-hema-free-resin-composite-system-in-class-ii-restorations-a-6-year-follow-up
#12
Jan W V van Dijken, Ulla Pallesen
OBJECTIVE: The objective of this randomized controlled prospective trial was to evaluate the durability of a low shrinkage and TEGDMA/HEMA-free resin composite system in posterior restorations in a 6-year follow up. METHODS: 139 Class II restorations were placed in 67 patients with a mean age of 53 years (range 29-82). Each participant received at random two, as similar as possible, Class II restorations. In the first cavity of each pair the TEGDMA/HEMA-free resin composite system was placed with its 3-step etch-and-rinse adhesive (cmf-els)...
May 22, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28545439/distribution-of-white-spot-lesions-among-orthodontic-patients-attending-teaching-institutes-in-khartoum
#13
Maha Kamal Eltayeb, Yahia Eltayeb Ibrahim, Ikhlas Ali El Karim, Nada Mirghani Sanhouri
BACKGROUND: Fixed orthodontic appliances render teeth cleaning arduous, thus when orthodontic treatment is associated with inadequate oral hygiene practice, development of white spot lesions (WSLs) imposes a significant risk on the dentition. Salivary reservoir of calcium, magnesium, phosphorous and fluoride counteracts demineralization and encourages remineralization providing protection against caries challenge. The investigation of the factors leading to WSLs' development is mandatory for appropriate prevention strategies planning...
May 25, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/28544987/a-high-efficiency-denitrification-bioreactor-for-the-treatment-of-acrylonitrile-wastewater-using-waterborne-polyurethane-immobilized-activated-sludge
#14
Honghong Dong, Wei Wang, Zhaozheng Song, Hao Dong, Jianfeng Wang, Shanshan Sun, Zhongzhi Zhang, Ming Ke, Zhenjia Zhang, Wei-Min Wu, Guangqing Zhang, Jie Ma
The performance of a laboratory-scale, high-efficiency denitrification bioreactor (15L) using activated sludge immobilized by waterborne polyurethane in treating acrylonitrile wastewater with high concentration of nitrate nitrogen (249mg/L) was investigated. The bioreactor was operated at 30°C for 220days. Batch denitrification experiments showed that the optimal operation parameters were C/NO3(-)-N molar ratio of 2.0 using sodium acetate as electron donor and carrier filling rate of 20% (V/V) in the bioreactor...
May 5, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28544848/decomposition-of-phenolic-impregnated-carbon-ablator-pica-as-a-function-of-temperature-and-heating-rate
#15
Brody Bessire, Timothy K Minton
Material response models for phenolic-based thermal protection systems (TPSs) for atmospheric entry are limited by the lack of knowledge of the nonequilibrium processes that may govern the decomposition pathways of phenolic resin at heating rates up to tens of degrees Celsius per second. We have investigated the pyrolysis of phenolic impregnated carbon ablator (PICA) by measuring the molar yields of the volatile decomposition products as a function of temperature at four nominal heating rates of 3.1, 6.1, 12...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28544606/effects-of-tooth-storage-media-on-periodontal-ligament-preservation
#16
Md Riasat Hasan, Hiroaki Takebe, Nazmus Shalehin, Nobuko Obara, Takashi Saito, Kazuharu Irie
BACKGROUND / AIMS: An easily available tooth storage medium is required to preserve a tooth after avulsion. Milk and Hank's balanced salt solution (HBSS) are recommended as tooth storage media, and egg white is also reported to be comparable with milk. The aim of the present study was to histologically and immunohistochemically evaluate the effect of different tooth storage media on the periodontal ligament (PDL) of extracted teeth. MATERIAL AND METHODS: This experiment used HBSS, milk and egg white as tooth storage media...
May 24, 2017: Dental Traumatology: Official Publication of International Association for Dental Traumatology
https://www.readbyqxmd.com/read/28544526/hetero-face-to-face-porphyrin-array-with-the-cooperative-effects-of-coordination-and-host-guest-complexation
#17
Yusuke Chiba, Maning Liu, Yasuhiro Tachibana, Tetsuaki Fujihara, Yasushi Tsuji, Jun Terao
We successfully synthesized a hetero face-to-face porphyrin array composed of ZnTPP and RuTPP(DABCO)₂ (TPP: 5,10,15,20-tetraphenylporphyrin, DABCO: 1,4-diazabi-cyclo[2.2.2]octane) in 2:1 molar ratio. A cyclic Zn porphyrin dimer (ZnCP) was also used as the host molecule for the Ru porphyrin. In the latter, the Ru-DABCO bonding in RuTPP(DABCO)₂ was stabilized by the host-guest complexation. Reaction progress kinetic analysis of the ligand substitution reaction of RuTPP(DABCO)₂ and that in ZnCP revealed the stabilization mechanism of the Ru-DABCO bonding...
May 22, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28544248/end-functionalized-palladium-scs-pincer-polymers-via-controlled-radical-polymerizations
#18
Diane S Lye, Aaron E Cohen, Madeleine Z Wong, Marcus Weck
A direct and facile route toward semitelechelic polymers, end-functionalized with palladated sulfur-carbon-sulfur pincer (Pd(II) -pincer) complexes is reported that avoids any post-polymerization step. Key to our methodology is the combination of reversible addition-fragmentation chain-transfer (RAFT) polymerization with functionalized chain-transfer agents. This strategy yields Pd end-group-functionalized materials with monomodal molar mass dispersities (Đ) of 1.18-1.44. The RAFT polymerization is investigated using a Pd(II) -pincer chain-transfer agent for three classes of monomers: styrene, tert-butyl acrylate, and N-isopropylacrylamide...
May 22, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28544043/identification-of-v-type-nerve-agents-in-vapor-samples-using-a-field-portable-capillary-gas-chromatography-membrane-interfaced-electron-ionization-quadrupole-mass-spectrometry-instrument-with-tri-bed-concentrator-and-fluoridating-conversion-tube
#19
Yasuhiko Ohrui, Tomoki Nagoya, Naoko Kurimata, Manabu Sodeyama, Yasuo Seto
A field-portable gas chromatography-mass spectrometry (GC-MS) system (Hapsite ER) was evaluated for the detection of nonvolatile V-type nerve agents (VX and Russian VX (RVX)) in the vapor phase. The Hapsite ER system consists of a Tri-Bed concentrator gas sampler, a nonpolar low thermal-mass capillary gas chromatography column and a hydrophobic membrane-interfaced electron ionization quadrupole mass spectrometer evacuated by a non-evaporative getter pump. The GC-MS system was attached to a VX-G fluoridating conversion tube containing silver nitrate and potassium fluoride...
May 25, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28544030/trapping-a-silicon-i-radical-with-carbenes-a-cationic-caac-silicon-i-radical-and-an-nhc-parent-silyliumylidene-cation
#20
Yan Li, Yuk-Chi Chan, Bi-Xiang Leong, Yongxin Li, Emma Richards, Indu Purushothaman, Susmita De, Pattiyil Parameswaran, Cheuk-Wai So
The trapping of a silicon(I) radical with N-heterocyclic carbenes is described. The reaction of the cyclic (alkyl)(amino) carbene [cAACMe ] (cAACMe =:C(CMe2 )2 (CH2 )NAr, Ar=2,6-iPr2 C6 H3 ) with H2 SiI2 in a 3:1 molar ratio in DME afforded a mixture of the separated ion pair [(cAACMe )2 Si:(.) ](+) I(-) (1), which features a cationic cAAC-silicon(I) radical, and [cAACMe -H](+) I(-) . In addition, the reaction of the NHC-iodosilicon(I) dimer [IAr (I)Si:]2 (IAr =:C{N(Ar)CH}2 ) with 4 equiv of IMe (:C{N(Me)CMe}2 ), which proceeded through the formation of a silicon(I) radical intermediate, afforded [(IMe )2 SiH](+) I(-) (2) comprising the first NHC-parent-silyliumylidene cation...
May 24, 2017: Angewandte Chemie
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