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https://www.readbyqxmd.com/read/29160822/how-secondary-and-tertiary-amide-moieties-are-molecular-stations-for-dibenzo-24-crown-8-in-2-rotaxane-molecular-shuttles
#1
Benjamin Riss-Yaw, Justine Morin, Caroline Clavel, Frédéric Coutrot
Interlocked molecular machines like [2]rotaxanes are intriguing aesthetic molecules. The control of the localization of the macrocycle, which surrounds a molecular axle, along the thread leads to translational isomers of very different properties. Although many moieties have been used as sites of interactions for crown ethers, the very straightforwardly obtained amide motif has more rarely been envisaged as molecular station. In this article, we report the use of secondary and tertiary amide moieties as efficient secondary molecular station in pH-sensitive molecular shuttles...
November 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29160399/marginal-and-internal-adaptation-of-zirconia-crowns-a-comparative-study-of-assessment-methods
#2
Rafael Schlögel Cunali, Rafaella Caramori Saab, Gisele Maria Correr, Leonardo Fernandes da Cunha, Bárbara Pick Ornaghi, André V Ritter, Carla Castiglia Gonzaga
Marginal and internal adaptation is critical for the success of indirect restorations. New imaging systems make it possible to evaluate these parameters with precision and non-destructively. This study evaluated the marginal and internal adaptation of zirconia copings fabricated with two different systems using both silicone replica and microcomputed tomography (micro-CT) assessment methods. A metal master model, representing a preparation for an all-ceramic full crown, was digitally scanned and polycrystalline zirconia copings were fabricated with either Ceramill Zi (Amann-Girrbach) or inCoris Zi (Dentslpy-Sirona), n=10...
July 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29156306/effect-of-microcystins-on-root-growth-oxidative-response-and-exudation-of-rice-oryza-sativa
#3
Qing Cao, Richard R Rediske, Lei Yao, Liqiang Xie
A 30 days indoor hydroponic experiment was carried out to evaluate the effect of microcystins (MCs) on rice root morphology and exudation, as well as bioaccumulation of MCs in rice. MCs were bioaccumulated in rice with the greatest concentrations being observed in the leaves (113.68μgg(-1) Fresh weight (FW)) when exposed to 500μgL(-1) MCs. Root activity at 500μgL(-1) decreased 37%, compared to the control. MCs also induced disruption of the antioxidant system and lipid peroxidation in rice roots. Root growth was significantly inhibited by MCs...
November 17, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29155527/provisional-restorations-%C3%A2-a-permanent-problem
#4
William F Keys, Naomi Keirby, David N J Ricketts
Provisional restorations play an important role when providing indirect restorations. There are a number of materials and techniques available for their construction. Careful planning and construction can protect the prepared tooth surface, improve the periodontal condition and help plan for the definitive restoration. A good provisional restoration can save time, money and effort. Clinical relevance: Provisional restoration construction is an integral part of the indirect restorative process for inlays, onlays, crowns and bridges...
December 2016: Dental Update
https://www.readbyqxmd.com/read/29153749/esthetic-abutment-design-for-angulated-screw-channels-a-technical-report
#5
Satoshi Sakamoto, Munehiko Ro, Aladdin Al Ardah, Charles Goodacre
Angulated screw channel system abutments (ASCs) have recently been introduced to address the problem with visible screw access that may compromise esthetics. ASCs allow the screw access to be modified up to 25 degrees relative to the implant axis. However, a widened channel, which may cause thinning of the facial ceramic, is needed at the implant screw head to allow for proper engagement of the screwdriver. This technical report introduces a custom titanium insert design, the Satoshi Sakamoto (SS) abutment...
November 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29153745/analysis-of-the-golden-proportion-and-width-height-ratios-of-maxillary-anterior-teeth-in-arab-and-kurdish-populations
#6
Neda Al-Kaisy, Balkees Taha Garib
STATEMENT OF PROBLEM: Dentists providing anterior restorations are guided by the principles of anatomic tooth dimension. Dental biometrics should consider ethnicity to produce a more comprehensive evaluation. PURPOSE: The purpose of this clinical study was to analyze the anatomic crowns of maxillary central incisors (CI), lateral incisors (LI), and canines (C) with respect to the golden proportion (GP) and width/height (W/H) ratio in Kurdish and Arab populations...
November 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29153734/the-incidence-of-second-mesiobuccal-canals-located-in-maxillary-molars-with-the-aid-of-cone-beam-computed-tomography
#7
Ben Studebaker, Lars Hollender, Lloyd Mancl, James D Johnson, Avina Paranjpe
INTRODUCTION: Many endodontic treatment failures in maxillary molars result from missed second mesiobuccal (MB2) canals. An MB2 canal orifice is present in as many as 95% of maxillary molars, but these canals are not always located during endodontic procedures. Additional tools, such as cone-beam computed tomographic (CBCT) imaging, may be needed to locate these canals in maxillary molars. Hence, the aims of this study were to investigate the frequency of use of CBCT imaging during the treatment of maxillary molars and to evaluate the influence of its use on the detection of MB2 canals...
November 15, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/29152779/morphogenesis-of-lingual-papillae-of-one-humped-camel-camelus-dromedarius-during-prenatal-life-a-light-and-scanning-electron-microscopic-study
#8
A S Abou-Elhamd, M Abd-Elkareem, A El-Zuhry Zayed
This study was made on 24 camel fetuses of crown-rump vertebral length (CVRL) ranging from 10.5 cm to 105 cm CVRL (94-352 days old). These camel fetuses were classified into three groups representing the three trimesters of prenatal life. During the first trimester (94-142 days), lingual papillae (circumvallate and lentiform papillae) were demonstrated on the lingual root, but lingual body and the apex were almost free of papillae except for some scattered epithelial projections especially near the lateral borders of the body...
November 19, 2017: Anatomia, Histologia, Embryologia
https://www.readbyqxmd.com/read/29151595/high-fat-diet-consumption-differentially-affects-adipose-tissue-inflammation-and-adipocyte-size-in-obesity-prone-and-obesity-resistant-rats
#9
J M Poret, F Souza-Smith, S J Marcell, D A Gaudet, T H Tzeng, H D Braymer, L M Harrison-Bernard, S D Primeaux
BACKGROUND/OBJECTIVES: Expanding visceral adiposity is associated with increased inflammation and increased risk for developing obesity-related comorbidities. The goal of this study was to examine high fat diet (HFD)-induced differences in adipocyte size and cytokine/chemokine expression in visceral and subcutaneous adipose depots in obesity-prone (OP) and obesity-resistant (OR) rats. METHODS: OP and OR rats were fed either a low fat diet (LFD, 10% kilocalories from fat) or HFD (60% kilocalories from fat) for 7 weeks...
November 20, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/29150135/effect-of-different-resin-luting-cements-on-the-marginal-fit-of-lithium-disilicate-pressed-crowns
#10
Radek Mounajjed, Thomas J Salinas, Tomas Ingr, Basel Azar
STATEMENT OF PROBLEM: The vertical marginal discrepancy of restorations can increase upon cementation, and poor marginal fit can lead to cement dissolution, marginal discoloration, microleakage, and secondary caries. The amount of increase is related to the type of luting cement used, but how lithium disilicate pressed crowns are affected by different resin cements is unclear. PURPOSE: The purpose of this in vitro study was to compare the effect of using different resin luting cements on the vertical marginal discrepancy of lithium disilicate pressed crowns...
November 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29149268/mitral-valve-replacement-with-the-novel-tribio-and-an-established-stented-bioprosthesis-in-a-sheep-model
#11
Sina Stock, Hans-Hinrich Sievers, Doreen Richardt, Michael Scharfschwerdt
OBJECTIVES: Heart valve replacement with a bioprosthesis is one of the most frequently performed procedures in cardiac surgery and represents a highly effective therapy to relieve diseased heart valves. Nevertheless, as postoperatively elevated transvalvular gradients and prosthesis-patient mismatch are reported as shortcomings of the procedure or of the currently used devices, there is a need for novel bioprostheses with improved haemodynamics. This study presents preclinical haemodynamic results after mitral valve replacement with the novel TRIBIO bioprosthesis (TRIBIO) compared with an established bioprosthesis in a sheep model...
November 15, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29149235/isolated-complexes-of-the-amino-acid-arginine-with-polyether-and-polyamine-macrocycles-the-role-of-proton-transfer
#12
Juan Ramón Avilés-Moreno, Giel Berden, Jos Oomens, Bruno Martínez-Haya
The distinct basicity of the guanidinium side-group of arginine (Arg) sustains specific interactions involved in essential biochemical processes. The sensing of arginine is therefore key in modern biotechnology and bioanalysis. In this context, the development of molecular receptors based on crown ether building blocks has demonstrated great potential. We investigate the complexes formed by arginine with two benchmark macrocycles, 12-crown-4 (1,4,7,10-tetraoxacyclododecane) and its N-substituted analog cyclen (1,4,7,10-tetraazacyclododecane)...
November 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29148912/influence-of-different-restoration-techniques-on-fracture-resistance-of-root-filled-teeth-in-vitro-investigation
#13
M E Hshad, E E Dalkılıç, G C Ozturk, I Dogruer, F Koray
OBJECTIVE: The purpose of this study was to determine the fracture strength of endodontically treated mandibular premolar teeth restored with composites and different reinforcement techniques. METHODS AND MATERIALS: Forty-eight freshly extracted human mandibular premolar teeth were randomly divided into four groups: group IN, group CR, group FRC, and group PRF. Group IN consisted of teeth with intact crowns and served as the control group. In the other three groups, endodontic treatment was performed and standard mesio-occluso-distal (MOD) cavities were prepared...
November 17, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/29148207/esthetic-evaluation-of-implant-supported-single-crowns-the-implant-restoration-esthetic-index-and-patient-perception
#14
Xiachen Li, Bilin Wu, Xiaohui Cheng, Yiming Li, Xin Xie, Feilong Deng
PURPOSE: To test the validity and reliability of a newly developed Implant Restoration Esthetic Index (IREI) and to compare esthetic outcomes reported by patients and professionals. MATERIALS AND METHODS: Ten graduate students and 10 prosthodontists assessed esthetic outcomes of 27 single-tooth implants with the IREI. Six peri-implant soft tissue parameters were measured using visual analog scales: mesial papilla presence, distal papilla presence, gingival trigone, soft tissue curvature, alveolar process deficiency, and soft tissue color and texture, as well as the six crown parameters: crown contour, crown position, crown labial convexity, crown characterization, crown color and translucency, and abutment visibility...
November 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29147845/-reconstruction-of-the-examination-of-the-laryngeal-carcinoma-of-emperor-frederick-iii-by-rudolf-virchow
#15
REVIEW
K Hussein, B Panning
Rudolf Virchow is one of the founders of modern pathology, and many of his ideas on inflammatory and neoplastic diseases are still valid today. Even for Virchow, determination of malignancy was not always easy. As an example, the laryngeal disease of Crown Prince Frederick William, the later Emperor Frederick III, is presented.The clinical findings at the beginning of the disease were suggestive of a carcinoma, though an inflammatory lesion was also discussed. Several attempts were made to remove the lesion bioptically, but local recurrences occurred and the first tissue samples were not examined histopathologically...
November 16, 2017: Der Pathologe
https://www.readbyqxmd.com/read/29147501/one-pot-synthesis-of-hetero-6-rotaxane-bearing-three-different-kinds-of-macrocycle-through-a-self-sorting-process
#16
Si-Jia Rao, Qi Zhang, Ju Mei, Xu-Hao Ye, Chuan Gao, Qiao-Chun Wang, Da-Hui Qu, He Tian
In this article, a six-component self-sorting process that involves three types of crown ether macrocycle and three types of cation guest molecule was carefully and thoroughly investigated. The six components include three kinds of crown ether, namely bis(p-phenylene-34-crown-10) (BPP34C10), dibenzo-24-crown-8 (DB24C8) and benzo-21-crown-7 (B21C7), and their corresponding cation guest molecules, namely a 4,4'-bipyridine dication (BPY(2+)) and dibenzylammonium (DBA) and benzylalkylammonium (BAA) ions, respectively...
October 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29146852/draft-genome-sequence-of-agrobacterium-tumefaciens-biovar-1-strain-186-isolated-from-walnut
#17
Amisha T Poret-Peterson, Srijak Bhatnagar, Ali E McClean, Daniel A Kluepfel
Agrobacterium tumefaciens biovar 1 strain 186 was isolated from a walnut tree expressing crown gall symptoms. The draft genome sequence of this strain harbored genes for crown gall formation and will be useful for understanding its virulence on Paradox, the predominant hybrid rootstock used for the cultivation of English walnut in California.
November 16, 2017: Genome Announcements
https://www.readbyqxmd.com/read/29146076/short-term-effects-of-prescribed-burning-on-litterfall-biomass-in-mixed-stands-of-pinus-nigra-and-pinus-pinaster-and-pure-stands-of-pinus-nigra-in-the-cuenca-mountains-central-eastern-spain
#18
J Espinosa, J Madrigal, A C De La Cruz, M Guijarro, E Jimenez, C Hernando
Fire severity, defined as the magnitude of fire effects in an ecosystem, is a key factor to consider in planning management strategies for protecting forests against fire. Although prescribed burning has been used as a fuel reduction tool in forest ecosystems, it is quite limited in the Mediterranean region. Furthermore, little is known about how tree crowns are affected by prescribed underburning aimed at reducing fire severity in conifer stands. As part of an ongoing study to assess the effects of prescribed burning on the tree canopy, litterfall is currently being monitored in a network of experimental plots located in mixed (Pinus nigra and Pinus pinaster) and pure (P...
November 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29145561/clinical-significance-of-cd73-in-triple-negative-breast-cancer-multiplex-analysis-of-a-phase-iii-clinical-trial
#19
L Buisseret, S Pommey, B Allard, S Garaud, M Bergeron, I Cousineau, L Ameye, Y Bareche, M Paesmans, J P A Crown, A Di Leo, S Loi, M Piccart-Gebhart, K Willard-Gallo, C Sotiriou, J Stagg
Background: CD73 is an ecto-enzyme that promotes tumor immune escape through the production of immunosuppressive extracellular adenosine in the tumor microenvironment. Several CD73 inhibitors and adenosine receptor antagonists are being evaluated in phase I clinical trials. Patients and methods: Full-face sections from formalin-fixed paraffin-embedded primary breast tumors from 122 samples of triple-negative breast cancer from the BIG 02-98 adjuvant phase III clinical trial were included in our analysis...
November 14, 2017: Annals of Oncology: Official Journal of the European Society for Medical Oncology
https://www.readbyqxmd.com/read/29145529/volumetric-bone-measurement-around-dental-implants-using-3d-image-superimposition-a-methodological-and-clinical-pilot-study
#20
Eduardo Aydos Villarinho, André Correia, Alvaro Vigo, Nuno Viriato Ramos, Mário Augusto Pires Vaz, Rosemary Sadami Arai Shinkai
PURPOSE: This study describes the development of a methodology for using three-dimensional (3D) image superimposition to measure volumetric changes in bone level around dental implants in comparison with linear measures. MATERIALS AND METHODS: The sample was comprised of 46 dental implants of 6-mm length and 4.1-mm diameter placed in the posterior maxilla and posterior mandible in 20 patients. All implants received screw-retained single crowns. Radiographic images were taken using cone beam computed tomography (CBCT) and digital periapical radiography after implantation and after 12 and 24 months of functional loading (after crown installation)...
November 16, 2017: International Journal of Prosthodontics
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