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https://www.readbyqxmd.com/read/29775299/viologen-based-rotaxanes-from-dibenzo-30-crown-10
#1
Hanlie R Wessels, Carla Slebodnick, Harry W Gibson
Three [2]rotaxanes (4, 7 and 12) and one [3]rotaxane (8) were synthesized based on the dibenzo-30-crown-10/viologen binding motif. To the best of our knowledge, these are the first rotaxanes formed from dibenzo-30-crown-10 and viologens. The rotaxanes were all characterized by 1 H NMR, 13 C NMR, and HRMS. An X-ray crystal structure of one of the [2]rotaxanes (7) was obtained. This work demonstrates for the first time that dibenzo-30-crown-10 does form pseudorotaxane complexes with viologens in solution.
May 18, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29775157/blood-based-biomarkers-in-breast-cancer-from-proteins-to-circulating-tumor-cells-to-circulating-tumor-dna
#2
Michael J Duffy, Enda W McDermott, John Crown
Biomarkers are the key to personalized treatment in patients with breast cancer. While tissue biomarkers are most useful in determining prognosis and upfront predicting response to therapy, circulating protein biomarkers such as CA 15-3 and carcinoembryonic antigen are mainly used in monitoring response to endocrine or chemotherapy in patients with advanced disease. Although several centers measure biomarkers in asymptomatic patients following curative surgery for primary breast cancer, the clinical utility of this practice is unclear...
May 2018: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/29775053/uranyl-tri-bis-silyl-amide-alkali-metal-contact-and-separated-ion-pair-complexes
#3
Philip J Cobb, David J Moulding, Fabrizio Ortu, Simon Randall, Ashley J Wooles, Louise S Natrajan, Stephen T Liddle
We report the preparation of a range of alkali metal uranyl(VI) tri- bis(silyl)amide complexes [{M(THF) x }{(μ-O)U(O)(N″)3 }] (1M) (N″ = {N(SiMe3 )2 }- , M = Li, Na, x = 2; M = K, x = 3; M = K, Rb, Cs, x = 0) containing electrostatic alkali metal uranyl-oxo interactions. Reaction of 1M with 2,2,2-cryptand or 2 equiv of the appropriate crown ether resulted in the isolation of the separated ion pair species [U(O)2 (N″)3 ][M(2,2,2-cryptand)] (3M, M = Li-Cs) and [U(O)2 (N″)3 ][M(crown)2 ] (4M, M = Li, crown = 12-crown-4 ether; M = Na-Cs, crown = 15-crown-5 ether)...
May 18, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29773838/impact-of-timing-of-trastuzumab-initiation-on-long-term-outcome-of-patients-with-early-stage-her2-positive-breast-cancer-the-one-thousand-her2-patients-project
#4
Giuseppe Gullo, Naomi Walsh, David Fennelly, Reetesh Bose, Janice Walshe, Dimitrios Tryfonopoulos, Kate O'Mahony, Lisa Hammond, Nuno Silva, Deirdre McDonnell, Josephine Ballot, Cecily Quinn, Enda W McDermott, Denis Evoy, Ruth Prichard, James Geraghty, John Amstrong, John Crown
BACKGROUND: The optimal timing of (neo)adjuvant trastuzumab initiation with respect to chemotherapy and surgery remains undefined. METHODS: Retrospective analysis of a large institutional database of HER2-positive patients who received anti-HER2 therapy. We included all Stage I to III patients treated with trastuzumab with a minimum follow up of 3 years. The date of first breast biopsy was recorded as initial diagnosis. RESULTS: A total of 506 patients [adjuvant: 386 (76%)-neo-adjuvant: 120 (24%)] were included...
May 18, 2018: British Journal of Cancer
https://www.readbyqxmd.com/read/29772930/changes-in-oral-health-related-quality-of-life-ohrqol-related-to-long-term-utilization-of-dental-care-among-older-people
#5
Anne Nordrehaug Åstrøm, Gunnar Ekback, Sven Ordell, Ferda Gulcan
OBJECTIVE: To examine whether long-term utilization of dental care, treatment with fillings and crowns and persistent tooth loss between age 50 and 65 years associate with subsequent changes in OHRQoL from age 65 to 70 years. METHOD: In 1992, a census of 50-year-olds received invitation to participate in a questionnaire survey. Of 6346 respondents, 3585 completed follow-ups in 1997, 2002, 2007 and 2012. OHRQoL was measured using the Oral Impacts on Daily Performances (OIDP) inventory...
May 18, 2018: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/29772034/three-dimensional-analysis-of-internal-adaptations-of-crowns-cast-from-resin-patterns-fabricated-using-computer-aided-design-computer-assisted-manufacturing-technologies
#6
Yushu Liu, Hongqiang Ye, Yong Wang, Yijao Zhao, Yuchun Sun, Yongsheng Zhou
PURPOSE: To evaluate the internal adaptations of cast crowns made from resin patterns produced using three different computer-aided design/computer-assisted manufacturing technologies. MATERIALS AND METHODS: A full-crown abutment made of zirconia was digitized using an intraoral scanner, and the design of the crown was finished on the digital model. Resin patterns were fabricated using a fused deposition modeling (FDM) 3D printer (LT group), a digital light projection (DLP) 3D printer (EV group), or a five-axis milling machine (ZT group)...
May 17, 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29767841/lignin-composition-is-related-to-xylem-embolism-resistance-and-leaf-life-span-in-trees-in-a-tropical-semiarid-climate
#7
Taysla R A Lima, Ellen C D Carvalho, Fernando R Martins, Rafael S Oliveira, Rafael S Miranda, Caroline S Müller, Luciano Pereira, Paulo R L Bittencourt, Jullyana C M S M Sobczak, Enéas Gomes-Filho, Rafael C Costa, Francisca S Araújo
Wood properties influence the leaf life span (LL) of tree crowns. As lignin is an important component of wood and the water transport system, we investigated its relationship with embolism resistance and the LL of several tree species in a seasonally dry tropical ecosystem. We determined total lignin and the monomer contents of guaiacyl (G) and syringyl (S) and related them to wood traits and xylem vulnerability to embolism (Ψ50 ) for the most common species of the Brazilian semiarid, locally known as Caatinga...
May 16, 2018: New Phytologist
https://www.readbyqxmd.com/read/29767210/low-threshold-lasing-from-colloidal-cdse-cdsete-core-alloyed-crown-type-ii-heteronanoplatelets
#8
Yuan Gao, Mingjie Li, Savas Delikanli, Haiyang Zheng, Baiquan Liu, Cuong Dang, Tze Chien Sum, Hilmi Volkan Demir
Colloidal type-II heterostructures are believed to be a promising solution-processed gain medium given their spatially separated electrons and holes for the suppression of Auger recombination and their wider emission tuning range from the visible to near-infrared region. Amplified spontaneous emission (ASE) was achieved from colloidal type-II core/shell nanocrystals several years ago. However, due to the limited charge-transfer (CT) interfacial states and minimal overlap of electron and hole wave functions, the ASE threshold has still been very high...
May 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29766644/evaluation-of-the-influence-of-implant-placement-timing-on-the-esthetic-outcomes-of-single-tooth-implant-treatment-in-the-anterior-maxilla-a-retrospective-study
#9
Himanshu Arora, Saso Ivanovski
OBJECTIVES: The purpose of this retrospective study was to investigate the influence of implant placement timing on the esthetic outcomes for single implants in the anterior maxilla. MATERIALS AND METHODS: One hundred and ten patients (48 males; 62 females) who received a single-tooth implant after extraction either immediately (Type 1); after 4-8 weeks (Type 2); after 8-16 weeks (Type 3); or more than 16 weeks (Type 4) were evaluated in terms of esthetic outcomes after a mean post-placement interval of 26...
May 15, 2018: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29766617/gingival-tissue-reaction-to-direct-adhesive-restoration-a-preliminary-study
#10
Carlo Bertoldi, Davide Zaffe, Luigi Generali, Andrea Lucchi, Pierpaolo Cortellini, Emanuela Monari
INTRODUCTION: It is debated if composite resin marginal/submarginal direct restoration can be usefully performed without inflammatory consequences. This histological study is the first human analysis aimed to compare, in the same tooth, the gingival tissue close to composite resin restorations with gingival tissue close to hard tissue. METHODS: Eight healthy patients with almost a residual strategic tooth needing endodontic therapy, and post-and-core restoration, then indirect prosthetic restoration, were selected...
May 16, 2018: Oral Diseases
https://www.readbyqxmd.com/read/29766409/where-youth-matters-clinicopathologic-characteristics-and-emerging-trends-in-treatment-and-outcomes-in-young-irish-women-with-breast-cancer
#11
Megan Greally, Jennifer Kielty, Geoffrey A Watson, Geoffrey Das, Christina Malouf, Lynda McSorley, Niamh Coleman, Cecily Quinn, Enda W McDermott, Giuseppe Gullo, John Crown, Ruth S Prichard, Catherine M Kelly, Janice M Walshe
BACKGROUND: Young women with breast cancer (YWBC) represent 7-12% of breast cancer diagnoses and ostensibly have more biologically aggressive subtypes with higher relapse and mortality rates. We studied the clinical and pathological characteristics in YWBC and examined how outcomes and treatment have evolved. METHODS: YWBC were identified from pathology databases at two tertiary centers. Patients were divided into two cohorts: those diagnosed from 2000 to 2005 (C1) and from 2006 to 2015 (C2)...
May 15, 2018: Irish Journal of Medical Science
https://www.readbyqxmd.com/read/29765979/influence-of-material-selection-on-the-marginal-accuracy-of-cad-cam-fabricated-metal-and-all-ceramic-single-crown-copings
#12
Matthias Rödiger, Lea Schneider, Sven Rinke
This study evaluated the marginal accuracy of CAD/CAM-fabricated crown copings from four different materials within the same processing route. Twenty stone replicas of a metallic master die (prepared upper premolar) were scanned and divided into two groups. Group 1 ( n = 10) was used for a pilot test to determine the design parameters for best marginal accuracy. Group 2 ( n = 10) was used to fabricate 10 specimens from the following materials with one identical CAD/CAM system (GAMMA 202, Wissner GmbH, Goettingen, Germany): A = commercially pure (cp) titanium, B = cobalt-chromium alloy, C = yttria-stabilized zirconia (YSZ), and D = leucite-reinforced glass-ceramics...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29765918/comparative-tomographic-study-of-the-maxillary-central-incisor-collum-angle-between-class-i-class-ii-division-1-and-2-patients
#13
Murilo Fernando Neuppmann Feres, Bianca Santana Rozolen, Adel Alhadlaq, Thamer A Alkhadra, Tarek El-Bialy
INTRODUCTION: It has been reported that Class II, division 2 maxillary central incisors frequently demonstrate increased collum angles, which indicates an excessive palatal "bend" of the crown. However, evidence supporting such observation is mostly derived from radiographic studies. OBJECTIVE: The objective of this study was to evaluate and compare the collum angle of maxillary central incisors in Class I, Class II, division 1, and Class II, division 2 cases using cone-beam computed tomography...
2018: Journal of Orthodontic Science
https://www.readbyqxmd.com/read/29765689/a-new-archaic-baleen-whale-toipahautea-waitaki-early-late-oligocene-new-zealand-and-the-origins-of-crown-mysticeti
#14
Cheng-Hsiu Tsai, R Ewan Fordyce
A new genus and species of extinct baleen whale † Toipahautea waitaki (Late Oligocene, New Zealand) is based on a skull and associated bones, from the lower Kokoamu Greensand, about 27.5 Ma (local upper Whaingaroan Stage, early Chattian). The upper jaw includes a thin, elongate and apparently toothless maxilla, with evidence of arterial supply for baleen. Open sutures with the premaxilla suggest a flexible (kinetic) upper jaw. The blowhole is well forward. The mandible is bowed laterally and slightly dorsally; unlike the Eomysticetidae, there are no mandibular alveoli, and the coronoid process is tapered and curved laterally...
April 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29765681/-salishicetus-meadi-a-new-aetiocetid-from-the-late-oligocene-of-washington-state-and-implications-for-feeding-transitions-in-early-mysticete-evolution
#15
Carlos Mauricio Peredo, Nicholas D Pyenson
Living baleen whales, or Mysticeti, lack teeth and instead feed using keratinous baleen plates to sieve prey-laden water. This feeding strategy is profoundly different from that of their toothed ancestors, which processed prey using the differentiated dentition characteristic of mammals. The fossil record of mysticetes reveals stem members that include extinct taxa with dentition, illuminating the morphological states that preceded the loss of teeth and the subsequent origin of baleen. The relationships among stem mysticetes, including putative clades such as Mammalodontidae and Aetiocetidae, remain debatable...
April 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29765678/a-new-large-squalodelphinid-cetacea-odontoceti-from-peru-sheds-light-on-the-early-miocene-platanistoid-disparity-and-ecology
#16
Giovanni Bianucci, Giulia Bosio, Elisa Malinverno, Christian de Muizon, Igor M Villa, Mario Urbina, Olivier Lambert
The South Asian river dolphin ( Platanista gangetica ) is the only extant survivor of the large clade Platanistoidea, having a well-diversified fossil record from the Late Oligocene to the Middle Miocene. Based on a partial skeleton collected from the Chilcatay Formation (Chilcatay Fm; southern coast of Peru), we report here a new squalodelphinid genus and species, Macrosqualodelphis ukupachai . A volcanic ash layer, sampled near the fossil, yielded the 40 Ar/39 Ar age of 18.78 ± 0.08 Ma (Burdigalian, Early Miocene)...
April 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29763362/fracture-strength-and-precision-of-fit-of-implant-retained-monolithic-zirconia-crowns
#17
Pauliina Moilanen, Jenni Hjerppe, Lippo Lassila, Timo Närhi
OBJECTIVES: To examine fracture strength and precision of fit of screw-retained anterior monolithic zirconia crowns made directly on implants or by cementing on prefabricated titanium bases, and to compare these to industrially produced Procera crowns. . MATERIALS AND METHODS: Monolithic screw-retained implant crowns were produced by CAD/CAM method (Zirkonzahn, Italy) using either partially (PSZ, Prettau, Zirconzahn, Italy) or fully stabilized (FSZ, Prettau Anterior, Zirkonzahn) zirconia...
May 15, 2018: Journal of Oral Implantology
https://www.readbyqxmd.com/read/29763360/three-dimensional-finite-element-analisys-of-stress-distribution-in-zirconia-and-titanium-dental-implants
#18
Camilo Andres Villabona, Marco Antônio Amorin Vasco, Edwin Ruales, Karin Apaza Bedoya, Cesar Magalhães Benfatti, Osvaldo Luis Bezzon, Tatiana Miranda Deliberador
Zirconia has been presented as an alternative biomaterial to titanium, commercially presented as a single body implant and / or as an abutment, demonstrating clinically biocompatible favorable results in white and rose aesthetics, However, the amount of long-term in-vivo studies and mechanical tests evaluating the response of stress distribution compared with titanium implants are still limited. The aim of the study was to compare by the finite element method, the principal stresses peaks in the peri implantar bone around titanium and zirconia implants...
May 15, 2018: Journal of Oral Implantology
https://www.readbyqxmd.com/read/29763356/chairside-cad-cam-composite-onlays-for-the-restoration-of-primary-molars
#19
Elisabeth Dursun, Aude Monnier-Da Costa, Christian Moussally
After pulp therapy or with multi-surface caries in primary molars, pre-formed stainless steel crowns are usually placed to ensure tooth longevity. Esthetic alternatives, such as zirconia crowns, have been proposed, but they are invasive. Here we describe two cases of chairside computer-aided design and computer-aided manufacturing (CAD/CAM) technology used to treat extended and/or deep caries on primary molars. A powder-free chairside CAD/CAM system, a milling unit and machinable high-performance composite blocks were used...
May 15, 2018: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/29761707/evaluation-of-the-load-system-produced-by-a-single-intrusion-bend-in-a-maxillary-lateral-incisor-bracket-with-different-alloys
#20
Ricardo Lima Shintcovsk, Roberto Soares da Silva, Larry White, Lidia Parsekian Martins, Renato Parsekian Martins
OBJECTIVES: To evaluate if a 0.5-mm vertical bend applied on an incisor bracket produces movements in other planes and if different wires influence these effects. MATERIALS AND METHODS: An acrylic model of a treated patient with brackets passively bonded was attached to an Orthodontic Force Tester, and a load cell was attached to the left lateral incisor. Thirty 0.019 × 0.025-inch archwires were divided into three groups according to their alloy: SS (stainless steel), B-Ti (beta-titanium), and MF (beta-titanium wire coated with nickel-titanium)...
May 15, 2018: Angle Orthodontist
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