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https://www.readbyqxmd.com/read/29057570/lanthanoid-pseudo-grignard-reagents-a-major-untapped-resource
#1
Safaa Ali, Glen Deacon, Peter Courtney Junk, Shima Hamidi, Michal Wiecko, Jun Wang
Pseudo-Grignard reagents PhLnI (Ln = Yb, Eu) readily prepared by the oxidative addition of iodobenzene to ytterbium or europium metal at -78oC in tetrahydrofuran (THF) or 1,2-dimethoxyethane (DME), react with a range of bulky N,N'-bis(aryl)formamidines to form an extensive series of LnII or more rarely LnIII complexes, namely [Eu(DippForm)I(thf)4].thf (1), [{EuI2(dme)2}2] (2), [Eu(XylForm)I(dme)2].0.5dme (3a), [Eu(XylForm)I(dme)(µ-dme)]n (3b), [{Eu(XylForm)I(m-OH)(thf)2}2] (4), [Yb(DippForm)I(thf)3].thf (5a), [Yb(DippForm)I2(thf)3]...
October 23, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29048546/housing-psychosocial-and-adherence-counseling-among-hiv-persons-in-ghana
#2
Eric Y Tenkorang, Adobea Y Owusu, Amos K Laar, Eric H Yeboah
As part of providing comprehensive HIV/AIDS services, the Ghana National AIDS Control Programme (NACP) and Ministry of Health recommend that Persons Living with HIV/AIDS (PLWHAs) receive psychosocial support and follow-up visits that ensure medical and drug adherence assistance. The successful implementation of these support services requires patients to have stable and quality housing, yet studies that examine associations between housing, psychosocial support, and adherence counseling among PLWHAs in Ghana and sub-Saharan Africa are limited...
October 18, 2017: Health Promotion International
https://www.readbyqxmd.com/read/28974859/choice-of-a-suitable-dosimeter-for-photon-percentage-depth-dose-measurements-in-flattening-filter-free-beams
#3
Silvia Vargas Castrillón, Francisco Cutanda Henríquez
The International Atomic Energy Agency Technical Reports Series-398 code of practice for dosimetry recommends measuring photon percentage depth dose (PDD) curves with parallel-plate chambers. This code of practice was published before flattening filter-free (FFF) beams were widely used in clinical linear accelerators. The choice of detector for PDD measurements needs to be reassessed for FFF beams given the physical differences between FFF beams and flattened ones. The present study compares PDD curves for FFF beams of nominal energies 6 MV, 6 FFF, 10 MV, and 10 FFF from a Varian TrueBeam linear accelerator (Varian Medical Systems, Palo Alto, USA) acquired with Scanditronix photon diodes, two scanning type chambers (both PTW 31010 Semiflex), two small volume chambers (Wellhofer CC04 and PTW 31016 PinPoint 3D), PTW 34001 Roos, Scanditronix Roos, and NACP 02 parallel-plate chambers...
July 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28836774/new-titanium-borylimido-compounds-synthesis-structure-and-bonding
#4
Benjamin A Clough, Simona Mellino, Andrey V Protchenko, Martin Slusarczyk, Laura C Stevenson, Matthew P Blake, Bowen Xie, Eric Clot, Philip Mountford
We report a combined experimental and computational study of the synthesis and electronic structure of titanium borylimido compounds. Three new synthetic routes to this hitherto almost unknown class of Group 4 imide are presented. The double-deprotonation reaction of the borylamine H2NB(NAr'CH)2 (Ar' = 2,6-C6H3(i)Pr2) with Ti(NMe2)2Cl2 gave Ti{NB(NAr'CH)2}Cl2(NHMe2)2, which was easily converted to Ti{NB(NAr'CH)2}Cl2(py)3. This compound is an entry point to other borylimides, for example, reacting with Li2N2(pyr)N(Me) to form Ti(N2(pyr)N(Me)){NB(NAr'CH)2}(py)2 and with 2 equiv of NaCp to give Cp2Ti{NB(NAr'CH)2}(py) (23)...
August 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28772450/combining-bioactive-multifunctional-dental-composite-with-pamam-for-root-dentin-remineralization
#5
Shimeng Xiao, Kunneng Liang, Michael D Weir, Lei Cheng, Huaibing Liu, Xuedong Zhou, Yi Ding, Hockin H K Xu
Objectives. The objectives of this study were to: (1) develop a bioactive multifunctional composite (BMC) via nanoparticles of amorphous calcium phosphate (NACP), 2-methacryloyloxyethyl phosphorylcholine (MPC), dimethylaminohexadecyl methacrylate (DMAHDM) and nanoparticles of silver (NAg); and (2) investigate the effects of combined BMC + poly (amido amine) (PAMAM) on remineralization of demineralized root dentin in a cyclic artificial saliva/lactic acid environment for the first time. Methods. Root dentin specimens were prepared and demineralized with 37% phosphoric acid for 15 s...
January 22, 2017: Materials
https://www.readbyqxmd.com/read/28734567/effect-of-calcium-phosphate-nanocomposite-on-in-vitro-remineralization-of-human-dentin-lesions
#6
Michael D Weir, Jianping Ruan, Ning Zhang, Laurence C Chow, Ke Zhang, Xiaofeng Chang, Yuxing Bai, Hockin H K Xu
OBJECTIVE: Secondary caries is a primary reason for dental restoration failures. The objective of this study was to investigate the remineralization of human dentin lesions in vitro via restorations using nanocomposites containing nanoparticles of amorphous calcium phosphate (NACP) or NACP and tetracalcium phosphate (TTCP) for the first time. METHODS: NACP was synthesized by a spray-drying technique and incorporated into a resin consisting of ethoxylated bisphenol A dimethacrylate (EBPADMA) and pyromellitic glycerol dimethacrylate (PMGDM)...
July 19, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28670045/transition-metal-free-formation-of-c-e-bonds-e-c-n-o-s-and-formation-of-c-m-bonds-m-mn-mo-from-n-heterocyclic-carbene-mediated-fluoroalkene-c-f-bond-activation
#7
Matthew C Leclerc, Bulat M Gabidullin, Jason G Da Gama, Stephanie L Daifuku, Theresa E Iannuzzi, Michael L Neidig, R Tom Baker
Herein, a recently reported polyfluoroalkenyl imidazolium salt is shown to react with nitrogen-, oxygen- and sulfur-based nucleophiles at the C β position in a stereoselective and regioselective fashion, without the use of a transition metal. In contrast, reactivity with 1-methylimidazole demonstrates net substitution at C α . This product reacts quantitatively with water, affording clean transformation of a difluoromethylene group to give an α,β-unsaturated trifluoromethyl ketone. Further reactivity studies demonstrate that the difluoromethyl fragment of an N-heterocyclic fluoroalkene is capable of direct C-C bond formation with NaCp through loss of sodium fluoride and double C-F bond activation (Cp = cyclopentadienide)...
February 27, 2017: Organometallics
https://www.readbyqxmd.com/read/28642057/novel-multifunctional-dental-cement-to-prevent-enamel-demineralization-near-orthodontic-brackets
#8
Yansong Ma, Ning Zhang, Michael D Weir, Yuxing Bai, Hockin H K Xu
OBJECTIVES: White spot lesions due to biofilm acid-induced enamel demineralization are prevalent in orthodontic treatments. The aim of this study was to develop a novel bioactive multifunctional cement with protein-repellent, antibacterial and remineralizing capabilities, and investigate the effects on enamel hardness and lesion depth in vitro for the first time. MATERIALS AND METHODS: 2-Methacryloyloxyethyl phosphorylcholine (MPC), dimethylaminohexadecyl methacrylate (DMAHDM), and nanoparticles of amorphous calcium phosphate (NACP) were incorporated into a resin-modified glass ionomer (RMGI)...
June 20, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28597866/delivery-of-antiretroviral-treatment-services-in-india-estimated-costs-incurred-under-the-national-aids-control-programme
#9
Reshu Agarwal, Bharat Bhushan Rewari, Suresh Shastri, Sharath Burugina Nagaraja, Abhilakh Singh Rathore
Competing domestic health priorities and shrinking financial support from external agencies necessitates that India's National AIDS Control Programme (NACP) brings in cost efficiencies to sustain the programme. In addition, current plans to expand the criteria for eligibility for antiretroviral therapy (ART) in India will have significant financial implications in the near future. ART centres in India provide comprehensive services to people living with HIV (PLHIV): those fulfilling national eligibility criteria and receiving ART and those on pre-ART care, i...
April 2017: WHO South-East Asia Journal of Public Health
https://www.readbyqxmd.com/read/28597865/adoption-of-the-2015-world-health-organization-guidelines-on-antiretroviral-therapy-programmatic-implications-for-india
#10
Bharat Bhushan Rewari, Reshu Agarwal, Suresh Shastri, Sharath Burugina Nagaraja, Abhilakh Singh Rathore
The therapeutic and preventive benefits of early initiation of antiretroviral therapy (ART) for HIV are now well established. Reflecting new research evidence, in 2015 the World Health Organization (WHO) recommended initiation of ART for all people living with HIV (PLHIV), irrespective of their clinical staging and CD4 cell count. The National AIDS Control Programme (NACP) in India is currently following the 2010 WHO ART guidelines for adults and the 2013 guidelines for pregnant women and children. This desk study assessed the number of people living with HIV who will additionally be eligible for ART on adoption of the 2015 WHO recommendations on ART...
April 2017: WHO South-East Asia Journal of Public Health
https://www.readbyqxmd.com/read/28526130/poly-amido-amine-and-calcium-phosphate-nanocomposite-remineralization-of-dentin-in-acidic-solution-without-calcium-phosphate-ions
#11
Kunneng Liang, Han Zhou, Michael D Weir, Chongyun Bao, Mark A Reynolds, Xuedong Zhou, Jiyao Li, Hockin H K Xu
OBJECTIVE: Patients with dry mouth often have an acidic oral environment lacking saliva that provides calcium (Ca) and phosphate (P) ions. However, there has been no study on dentin remineralization by placing samples in an acidic solution without Ca and P ions. Previous studies used saliva-like solutions with neutral pH and Ca and P ions. Therefore, the objective of this study was to investigate a novel method of combining poly(amido amine) (PAMAM) with a composite of nanoparticles of amorphous calcium phosphate (NACP) on dentin remineralization in an acidic solution without Ca and P ions for the first time...
May 16, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28479873/comparison-of-surface-dose-delivered-by-7%C3%A2-mv-unflattened-and-6%C3%A2-mv-flattened-photon-beams
#12
Ashokkumar Sigamani, Arunai Nambiraj
AIM: The purpose of this study is to determine the central-axis dose in the buildup region and the surface dose delivered by a 6 MV flattened photon beam (6 MV-FB) and a higher energy unflattened (7 MV-FFF) therapeutic photon beam for different-sized square fields with open fields and modifying filters. MATERIALS AND METHODS: The beams are produced by a Siemens Artiste linear accelerator with a NACP-02 ionization chamber and the dose is measured by using GafChromic film and two different, commonly used, dosimeters: a p-type photon semiconductor dosimeter (PFD) and a cylindrical ionization chamber (CC13)...
May 2017: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/28356216/novel-dental-adhesive-with-triple-benefits-of-calcium-phosphate-recharge-protein-repellent-and-antibacterial-functions
#13
Xianju Xie, Lin Wang, Dan Xing, Ke Zhang, Michael D Weir, Huaibing Liu, Yuxing Bai, Hockin H K Xu
OBJECTIVE: A new adhesive containing nanoparticles of amorphous calcium phosphate (NACP) with calcium (Ca) and phosphate (P) ion rechargeability was recently developed; however, it was not antibacterial. The objectives of this study were to: (1) develop a novel adhesive with triple benefits of Ca and P ion recharge, protein-repellent and antibacterial functions via dimethylaminohexadecyl methacrylate (DMAHDM) and 2-methacryloyloxyethyl phosphorylcholine (MPC); and (2) investigate dentin bond strength, protein adsorption, Ca and P ion concentration, microcosm biofilm response and pH properties...
May 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28278579/ph-activated-nano-amorphous-calcium-phosphate-based-cement-to-reduce-dental-enamel-demineralization
#14
Mary A S Melo, Michael D Weir, Vanara F Passos, Michael Powers, Hockin H K Xu
Enamel demineralization is destructive, esthetically compromised, and costly complications for orthodontic patients. Nano-sized amorphous calcium phosphate (NACP) has been explored to address this challenge. The 20% NACP-loaded ortho-cement notably exhibited favorable behavior on reducing demineralization of enamel around brackets in a caries model designed to simulate the carious attack. The 20% NACP-loaded ortho-cement markedly promotes higher calcium and phosphate release at a low pH, and the mineral loss was almost two fold lower and carious lesion depth decreased the by 1/3...
December 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28275445/india-s-hiv-programme-successes-and-challenges
#15
EDITORIAL
Sukarma Tanwar, B B Rewari, Cv Dharma Rao, Nicole Seguy
Over the last two decades, India's National AIDS Control Programme (NACP) has evolved and expanded to provide HIV prevention, testing and treatment services countrywide. Scaling up has been uniform across all strategic components and has not only halted, but also reversed, the spread of the epidemic and ensured a major reduction in the number of AIDS-related annual deaths. As the epidemic has been driven by key populations, there was a special focus on these groups from the outset, with various innovative strategies for prevention and testing services...
November 28, 2016: Journal of Virus Eradication
https://www.readbyqxmd.com/read/28223198/novel-bioactive-root-canal-sealer-to-inhibit-endodontic-multispecies-biofilms-with-remineralizing-calcium-phosphate-ions
#16
Lin Wang, Xianju Xie, Chunyan Li, Huaibing Liu, Ke Zhang, Yanmin Zhou, Xiaofeng Chang, Hockin H K Xu
OBJECTIVE: The objectives of this study were to: (1) develop a bioactive endodontic sealer via dimethylaminohexadecyl methacrylate (DMAHDM), 2-methacryloyloxyethyl phosphorylcholine (MPC) and nanoparticles of amorphous calcium phosphate (NACP) for the first time; and (2) evaluate inhibition of early-stage and mature multispecies endodontic biofilm, bond strength to root canal dentine, and calcium (Ca) and phosphate (P) ion release. METHODS: A series of bioactive endodontic sealers were formulated with DMAHDM, MPC, and NACP...
May 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28112309/double-deboronation-and-homometalation-of-1-1-bis-ortho-carborane
#17
Gobika Thiripuranathar, Antony P Y Chan, Dipendu Mandal, Wing Y Man, Mario Argentari, Georgina M Rosair, Alan J Welch
Double deboronation of 1,1'-bis(ortho-carborane) results in a mixture of racemic and meso diastereoisomers which are sources of the [7-(7'-7',8'-nido-C2B9H10)-7,8-nido-C2B9H10](4-) tetraanion. Consistent with this, metalation of the mixture with {Ru(p-cymene)} affords the diastereoisomers α-[1-(8'-2'-(p-cymene)-2',1',8'-closo-RuC2B9H10)-3-(p-cymene)-3,1,2-closo-RuC2B9H10] (3α) and β-[1-(8'-2'-(p-cymene)-2',1',8'-closo-RuC2B9H10)-3-(p-cymene)-3,1,2-closo-RuC2B9H10] (3β) in which the primed cage has undergone a spontaneous 3',1',2' to 2',1',8'-RuC2B9 isomerisation...
January 23, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28024641/poly-amido-amine-and-nano-calcium-phosphate-bonding-agent-to-remineralize-tooth-dentin-in-cyclic-artificial-saliva-lactic-acid
#18
Kunneng Liang, Michael D Weir, Mark A Reynolds, Xuedong Zhou, Jiyao Li, Hockin H K Xu
The objectives of this study were to develop a novel method to remineralize dentin lesions, and investigate the remineralization effects of poly (amido amine) (PAMAM) dendrimer plus a bonding agent with nanoparticles of amorphous calcium phosphate (NACP) in a cyclic artificial saliva/lactic acid environment for the first time. Dentin lesions were produced via phosphoric acid. Four groups were tested: (1) dentin control, (2) dentin with PAMAM, (3) dentin with NACP bonding agent, and (4) dentin with PAMAM plus NACP bonding agent...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27827498/control-of-clustering-behavior-in-anionic-cerium-iii-corrole-complexes-from-oligomers-to-monomers
#19
Keith C Armstrong, Stephan Hohloch, Trevor D Lohrey, Ryan A Zarkesh, John Arnold, Mitchell R Anstey
The first synthesis of anion capped cerium corrole complexes is reported. Unusual clustering of the lanthanide corrole units has been found and the degree of aggregation can be controlled by the choice of the capping ligand. A polymeric structure 1a, with the general formula [Cor-Ce(THF)-Cp-Na]n (Cor = 5,15-bis(2,4,6-trimethylphenyl)-10-(4 methoxyphenyl)-corrole, THF = tetrahydrofuran), is formed using sodium cyclopentadienide (NaCp) and a dimeric structure 2a, with the general formula [Cor-Ce-Tp]2, is formed when potassium tris(pyrazolyl)borate (KTp) is used...
November 22, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27811847/novel-rechargeable-calcium-phosphate-nanoparticle-containing-orthodontic-cement
#20
Xian-Ju Xie, Dan Xing, Lin Wang, Han Zhou, Michael D Weir, Yu-Xing Bai, Hockin Hk Xu
White spot lesions (WSLs), due to enamel demineralization, occur frequently in orthodontic treatment. We recently developed a novel rechargeable dental composite containing nanoparticles of amorphous calcium phosphate (NACP) with long-term calcium (Ca) and phosphate (P) ion release and caries-inhibiting capability. The objectives of this study were to develop the first NACP-rechargeable orthodontic cement and investigate the effects of recharge duration and frequency on the efficacy of ion re-release. The rechargeable cement consisted of pyromellitic glycerol dimethacrylate (PMGDM) and ethoxylated bisphenol A dimethacrylate (EBPADMA)...
March 2017: International Journal of Oral Science
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