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https://www.readbyqxmd.com/read/28449201/silencing-of-agrobacterium-tumefaciens-oncogenes-ipt-and-iaam-induces-resistance-to-crown-gall-disease-in-plum-but-not-in-apricot
#1
Nuria Alburquerque, Lydia Faize, Lorenzo Burgos
BACKGROUND: In this study two vectors with short-length chimeric transgenes were used to produce Prunus rootstocks resistant to crown gall disease through RNA interference-mediated gene silencing of the Agrobacterium tumefaciens oncogenes ipt and iaaM. RESULTS: Transgenic plum and apricot lines were produced with efficiencies of up to 7.7 and 1.1%, respectively. An in vitro evaluation method allowed identifying susceptible lines and reducing the number of lines to be evaluated in the greenhouse...
April 27, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28448915/ozone-exposure-affects-tree-defoliation-in-a-continental-climate
#2
Alessandra De Marco, Marcello Vitale, Ionel Popa, Alessandro Anav, Ovidiu Badea, Diana Silaghi, Stefan Leca, Augusto Screpanti, Elena Paoletti
Ground-level ozone (O3) affects trees through visible leaf injury, accelerating leaf senescence, declining foliar chlorophyll content, photosynthetic activity, growth, carbon sequestration, predisposing to pests attack and a variety of other physiological effects. Tree crown defoliation is one of the most important parameters that is representative of forest health and vitality. Effects of air pollution on forests have been investigated through manipulative experiments that are not representative of the real environmental conditions observed in the field...
April 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28448524/modelling-the-vertical-distribution-of-canopy-fuel-load-using-national-forest-inventory-and-low-density-airbone-laser-scanning-data
#3
Eduardo González-Ferreiro, Stéfano Arellano-Pérez, Fernando Castedo-Dorado, Andrea Hevia, José Antonio Vega, Daniel Vega-Nieva, Juan Gabriel Álvarez-González, Ana Daría Ruiz-González
The fuel complex variables canopy bulk density and canopy base height are often used to predict crown fire initiation and spread. Direct measurement of these variables is impractical, and they are usually estimated indirectly by modelling. Recent advances in predicting crown fire behaviour require accurate estimates of the complete vertical distribution of canopy fuels. The objectives of the present study were to model the vertical profile of available canopy fuel in pine stands by using data from the Spanish national forest inventory plus low-density airborne laser scanning (ALS) metrics...
2017: PloS One
https://www.readbyqxmd.com/read/28446043/crown-heights-in-the-permanent-teeth-of-47-xyy-males
#4
Raija Pentinpuro, Paula Pesonen, Lassi Alvesalo, Raija Lähdesmäki
OBJECTIVE: The results in human sex chromosome aneuploidies had shown that the extra Y chromosome increases permanent and deciduous tooth crown sizes in the mesiodistal and labiolingual directions. The hypothesis of the study was that the additional Y chromosome increases the permanent tooth crown growth in a vertical dimension. We also aimed to observe possible sex difference in the permanent tooth crown height. MATERIAL AND METHODS: Data on 15 47,XYY males or males with an extra Y chromosome, nine male relatives (five brothers and four fathers) and 45 male and 48 female population controls had been gathered previously for Professor Lassi Alvesalo's KVANTTI Research Project...
April 26, 2017: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/28445464/burgess-shale-fossils-illustrate-the-origin-of-the-mandibulate-body-plan
#5
Cédric Aria, Jean-Bernard Caron
Retracing the evolutionary history of arthropods has been one of the greatest challenges in biology. During the past decade, phylogenetic analyses of morphological and molecular data have coalesced towards the conclusion that Mandibulata, the most diverse and abundant group of animals, is a distinct clade from Chelicerata, in that its members possess post-oral head appendages specialized for food processing, notably the mandible. The origin of the mandibulate body plan, however, which encompasses myriapods, crustaceans and hexapods, has remained poorly documented...
April 26, 2017: Nature
https://www.readbyqxmd.com/read/28444200/the-mediterranean-the-cradle-of-anthoxanthum-poaceae-diploid-diversity
#6
Zuzana Chumová, Eliška Záveská, Terezie Mandáková, Karol Krak, Pavel Trávnícek
Background and Aims: Knowledge of diploid phylogeny and ecogeography provide a foundation for understanding plant evolutionary history, diversification patterns and taxonomy. The genus Anthoxanthum (vernal grasses, Poaceae) represents a taxonomically intricate polyploid complex with large phenotypic variation and poorly resolved evolutionary relationships. The aims of the study were to reveal: (1) evolutionary lineages of the diploid taxa and their genetic differentiation; (2) the past distribution of the rediscovered 'Mediterranean diploid'; and (3) possible migration routes of diploids in the Mediterranean...
April 21, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28440697/the-prevalence-of-calcification-around-odontoid-process-and-the-incidence-of-crowned-dens-syndrome-in-the-neurosurgical-ward-a-single-institution-s-analysis
#7
Masakazu Sano, Shinya Yamashita, Toyotaka Aiba
OBJECTIVE: The objective of this study is to assess the prevalence and natural history of odontoid calcification and to identify factors related to its progression to crowned dens syndrome (CDS). METHODS: We reviewed a consecutive series of patients who underwent head CT upon admission to the neurosurgical ward of Niigata Prefectural Shibata Hospital. We evaluated the relationship between the presence of odontoid calcification and the patient's age, sex, and primary disorder for admission...
April 25, 2017: Modern Rheumatology
https://www.readbyqxmd.com/read/28440007/spectrophotometric-analysis-of-fluorescent-zirconia-abutments-compared-to-conventional-zirconia-abutments-a-within-subject-controlled-clinical-trial
#8
Daniel S Thoma, Felix B Gamper, Vítor M Sapata, Giuseppe Voce, Christoph H F Hämmerle, Irena Sailer
BACKGROUND: Zirconia abutments are frequently used for implant-supported single crowns. Even though demonstrating esthetic benefits compared to metal abutments, zirconia abutments lead to an increased brightness of the peri-implant mucosa compared to natural teeth and are not ideal from an esthetic point of view. PURPOSE: To test whether or not a fluorescent hybrid zirconia abutment offers superior esthetics compared to a non-fluorescent one-piece zirconia abutment based on spectrophotometric analysis...
April 24, 2017: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/28438702/global-phylogeny-and-biogeography-of-the-fern-genus-ctenitis-dryopteridaceae-with-a-focus-on-the-indian-ocean-region
#9
Sabine Hennequin, Germinal Rouhan, Alexandre Salino, Yi-Fan Duan, Marie-Capucine Lepeigneux, Marguerite Guillou, Steve Ansell, Thaís Elias Almeida, Li-Bing Zhang, Harald Schneider
The diverse and pantropical genus Ctenitis, in the Dryopteridaceae, has been largely ignored in phylogenetic studies until now. In this study, we fill in this gap by reconstructing the first comprehensive phylogeny of the genus including 53 species currently recognized in the genus Ctenitis, among which seven species formerly were assigned to the genus Pseudotectaria and one to Heterogonium. Special emphasis was given to the sampling of species occurring in the African-Indian Ocean region. The presented results include reconstruction of a biogeographic scenario based on estimated divergence times and ancestral area reconstruction...
April 21, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28435357/effectiveness-of-audiovisual-distraction-with-computerized-delivery-of-anesthesia-during-the-placement-of-stainless-steel-crowns-in-children-with-down-syndrome
#10
Kausar Sadia Fakhruddin, Hisham El Batawi, M O Gorduysus
OBJECTIVE: Assessing effectiveness of audiovisual (AV) distraction with/without video eyewear and computerized delivery system-intrasulcular (CDS-IS) for local anesthesia during placement of stainless steel crowns for the management of pathological tooth grinding in children with Down syndrome. MATERIALS AND METHODS: This clinical study includes 22 children (13 boys and 9 girls), with mean age being 7.1 years. The study involved three sessions 1-week apart. During Session I, dental prophylaxis to the upper jaw was done while watching a movie projected on the ceiling without video eyewear whereas prophylaxis for the lower jaw and impressions of both jaws were taken while watching another movie using eyewear projection...
January 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28434685/influence-of-inhomogeneous-dental-posts-on-stress-distribution-in-tooth-root-and-interfaces-three-dimensional-finite-element-analysis
#11
Mojtaba Mahmoudi, Ali Reza Saidi, Parviz Amini, Maryam Alsadat Hashemipour
STATEMENT OF PROBLEM: In post-core crown restorations, the use of flexible posts concentrates stresses at the dentin and the use of stiff posts concentrates stresses at the interfaces. A class of inhomogeneous materials (called functionally graded materials) has been proposed for posts to resolve the weaknesses of both flexible and rigid posts. PURPOSE: The purpose of this in vitro study was to design an inhomogeneous post and investigate its influence on the stress distribution of post-core crown restorations...
April 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28434681/the-use-of-monolithic-lithium-disilicate-for-posterior-screw-retained-implant-crowns
#12
Nicola Mobilio, Santo Catapano
Lithium disilicate is typically used for fabricating prosthetic crowns to be cemented on teeth or implant abutments. However, its use for producing screw-retained implant crowns has been less commonly described. This report describes the use of monolithic lithium disilicate for a screw-retained implant crowns.
April 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28434679/effect-of-fabrication-stages-and-cementation-on-the-marginal-fit-of-cad-cam-monolithic-zirconia-crowns
#13
Ediz Kale, Burak Yilmaz, Emre Seker, Tuncer Burak Özcelik
STATEMENT OF PROBLEM: Monolithic zirconia crowns fabricated using computer-aided design and computer-aided manufacturing (CAD-CAM) technology have recently become an alternative dental prosthetic treatment. The marginal fit of monolithic zirconia crown may be affected by different stages of the fabrication procedures in the laboratory and cementation. Information regarding the accuracy of fit of monolithic zirconia crowns at different stages of fabrication and cementation is limited. PURPOSE: The purpose of this in vitro study was to evaluate the effect of different stages of fabrication and cementation on the vertical marginal discrepancy (VMD) of CAD-CAM fabricated monolithic zirconia crowns...
April 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28434556/cad-cam-techniques-help-in-the-rebuilding-of-ideal-marginal-gingiva-contours-of-anterior-maxillary-teeth-a-case-report
#14
Jiayue Yin, Dan Liu, Yuehua Huang, Lin Wu, Xiaolin Tang
BACKGROUND AND OVERVIEW: "Pink esthetics," which are considered to be as important as "white esthetics," have attracted increasing attention. To date, clinicians rarely have applied computer-aided design and computer-aided manufacturing (CAD/CAM) techniques in the rebuilding of the contour of the marginal gingiva in the esthetic zone. CASE DESCRIPTION: In this case report, the authors describe a female patient who had gingival inflammation and an asymmetrical contour of the marginal gingiva of the anterior maxillary teeth because previously placed ceramic crowns violated the biological width...
April 20, 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/28431806/gender-specific-evaluation-of-variation-of-maxillary-exposure-when-smiling
#15
Niels Christian Pausch, Dimitrios Katsoulis
INTRODUCTION: Excessive exposure of maxillary teeth when smiling can have a negative effect on the aesthetics and attractiveness of the face. The presented study was aimed to evaluate the effect of different amounts of gingival exposure on the perception of such human characteristics and qualities as age, attractiveness, gender specificity, and felt sympathy in the context of the whole face. MATERIALS AND METHODS: Forty-two participants (21 female and 21 male students of Dental Medicine) were recruited as evaluators for the study...
March 27, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28431628/clinical-and-quantitative-analysis-of-patients-with-crowned-dens-syndrome
#16
Teruyuki Takahashi, Masato Tamura, Toshiaki Takasu, Satoshi Kamei
BACKGROUND: Crowned dens syndrome (CDS) is a radioclinical entity defined by calcium deposition on the transverse ligament of atlas (TLA). In this study, the novel semi-quantitative diagnostic criteria for CDS to evaluate the degree of calcification on TLA by cervical CT are proposed. METHOD: From January 2010 to September 2014, 35 patients who were diagnosed with CDS by cervical CT were adopted as subjects in this study. Based on novel criteria, calcium deposition on TLA was classified into "Stage" and "Grade", to make a score, which was evaluated semi-quantitatively...
May 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28431496/the-phylogeny-of-fossil-whip-spiders
#17
Russell J Garwood, Jason A Dunlop, Brian J Knecht, Thomas A Hegna
BACKGROUND: Arachnids are a highly successful group of land-dwelling arthropods. They are major contributors to modern terrestrial ecosystems, and have a deep evolutionary history. Whip spiders (Arachnida, Amblypygi), are one of the smaller arachnid orders with ca. 190 living species. Here we restudy one of the oldest fossil representatives of the group, Graeophonus anglicus Pocock, 1911 from the Late Carboniferous (Duckmantian, ca. 315 Ma) British Middle Coal Measures of the West Midlands, UK...
April 21, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28429401/synthesis-of-l-threitol-based-crown-ethers-and-their-application-as-enantioselective-phase-transfer-catalyst-in-michael-additions
#18
Zsolt Rapi, Tamás Nemcsok, Ádám Pálvölgyi, György Keglevich, Alajos Grün, Péter Bakó
A few new l-threitol-based lariat ethers incorporating a monoaza-15-crown-5 unit were synthesized starting from diethyl l-tartrate. These macrocycles were used as phase transfer catalysts in asymmetric Michael addition reactions under mild conditions to afford the adducts in a few cases in good to excellent enantioselectivities. The addition of 2-nitropropane to trans-chalcone, and the reaction of diethyl acetamidomalonate with β-nitrostyrene resulted in the chiral Michael adducts in good enantioselectivities (90% and 95%, respectively)...
April 21, 2017: Chirality
https://www.readbyqxmd.com/read/28429174/a-unique-sensitive-and-highly-selective-fluorescent-naphthodiaza-crown-macrocyclic-ligand-chemosensor-for-hg-2-in-water
#19
Bahram Ghanbari, Morteza Zarepour-Jevinani
The noticeable enhancement in fluorescence emission of O2N2-donor naphthodiaza-crown macrocyclic ligand (L) in the presence of Hg(2+) was observed in which the fluorescence quantum yield of free ligand L as well as L/Hg(2+) complex were found to be as 0.29 and 0.49, respectively. The observed ultra-low limit of detection (LOD) for Hg(2+) by L was determined as low as 1.0 × 10(-11) M in water. A 1:1 stoichiometry was also established for L/Hg(2+) together with a binding constant K BH = 66,543 by employing fluorescence spectrophotometry...
April 20, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28428604/in-vitro-cavity-and-crown-preparations-and-direct-restorations-a-comparison-of-performance-at-the-start-and-end-of-the-fd-programme
#20
F J T Burke, V Ravaghi, L Mackenzie, N Priest, H C Falcon
Aim To assess the performance and thereby the progress of the FDs when they carried out a number of simulated clinical exercises at the start and at the end of their FD year.Methods A standardised simulated clinical restorative dentistry training exercise was carried out by a group of 61 recently qualified dental graduates undertaking a 12 months' duration foundation training programme in England, at both the start and end of the programme. Participants completed a Class II cavity preparation and amalgam restoration, a Class IV composite resin restoration and two preparations for a porcelain-metal full crown...
April 21, 2017: British Dental Journal
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