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https://www.readbyqxmd.com/read/27925324/the-delicate-balance-of-preorganisation-and-adaptability-in-multiply-bonded-host-guest-complexes
#1
Larissa K S von Krbek, Andreas J Achazi, Stefan Schoder, Marius Gaedke, Tobias Biberger, Beate Paulus, Christoph A Schalley
Rigidity and preorganisation are believed to be required for high affinity in multiply bonded supramolecular complexes as they help reducing the entropic penalty of the binding event. This comes at the price that such rigid complexes are sensitive to small geometric mismatches. In marked contrast, nature uses more flexible building blocks. Thus, one might consider putting the rigidity-high affinity notion to the test. Multivalent crown/ammonium complexes are ideal for this purpose as the monovalent interaction is well understood...
December 7, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27919637/critical-hand-ischemia-treatment-via-orbital-atherectomy-a-single-center-observational-retrospective-analysis
#2
Abdul Bahro, Zsuzsanna Igyarto, Brad Martinsen
BACKGROUND/PURPOSE: Critical hand ischemia (CHI) can be devastating and may result in amputation. Distal vessel calcification has been shown to be a major factor in causing CHI. Atherectomy in the upper extremities is not typically considered due to the small anatomy; however, the Diamondback 360° Peripheral Orbital Atherectomy System (OAS) (Cardiovascular Systems, Inc.) can access treatment areas with a reference vessel diameter of 1.5mm. METHODS/MATERIALS: A retrospective, observational, single center (Merit Health Center, Jackson, MS) analysis of 11 CHI patients with calcific disease of the radial artery treated with orbital atherectomy (OAS) was completed...
October 29, 2016: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/27918736/predictive-factors-of-difficulty-in-lower-third-molar-extraction-a-prospective-cohort-study
#3
J Alvira-González, R Figueiredo, E Valmaseda-Castellón, C Quesada-Gómez, C Gay-Escoda
BACKGROUND: Several publications have measured the difficulty of third molar removal, trying to establish the main risk factors, however several important preoperative and intraoperative variables are overlooked. MATERIAL AND METHODS: A prospective cohort study comprising a total of 130 consecutive lower third molar extractions was performed. The outcome variables used to measure the difficulty of the extraction were operation time and a 100mm visual analogue scale filled by the surgeon at the end of the surgical procedure...
December 6, 2016: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/27918074/the-origin-of-animals-can-molecular-clocks-and-the-fossil-record-be-reconciled
#4
John A Cunningham, Alexander G Liu, Stefan Bengtson, Philip C J Donoghue
The evolutionary emergence of animals is one of the most significant episodes in the history of life, but its timing remains poorly constrained. Molecular clocks estimate that animals originated and began diversifying over 100 million years before the first definitive metazoan fossil evidence in the Cambrian. However, closer inspection reveals that clock estimates and the fossil record are less divergent than is often claimed. Modern clock analyses do not predict the presence of the crown-representatives of most animal phyla in the Neoproterozoic...
December 5, 2016: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
https://www.readbyqxmd.com/read/27917418/an-unprecedented-1-4-diphospha-2-3-disila-butadiene-p-double-bond-length-as-m-dash-si-si-double-bond-length-as-m-dash-p-derivative-and-a-1-3-diphospha-2-silaallyl-anion-each-stabilized-by-the-amidinate-ligand
#5
Subrata Kundu, Chandrajeet Mohapatra, Prinson P Samuel, Johannes Kretsch, M G Walawalkar, Regine Herbst-Irmer, Dietmar Stalke, Sriman De, Debasis Koley, Herbert W Roesky
The first acyclic 4π-electron -P[double bond, length as m-dash]Si-Si[double bond, length as m-dash]P- motif with two four coordinate silicon substituents supported by the amidinate ligand and two coordinate phosphorus has been synthesized from the reaction of heteroleptic chlorosilylene LSiCl (1), TripPCl2 (Trip = 2,4,6-(i)Pr3C6H2) and KC8 in a 1 : 1 : 3 ratio. The same reaction in a 1 : 2 : 6 ratio in the presence of one equivalent of 18-crown-6 ether affords the 1,3-diphospha-2-silaallyl anion...
December 5, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27914668/three-dimensional-finite-element-analysis-of-implant-assisted-removable-partial-dentures
#6
Ju-Won Eom, Young-Jun Lim, Myung-Joo Kim, Ho-Beom Kwon
STATEMENT OF PROBLEM: Whether the implant abutment in implant-assisted removable partial dentures (IARPDs) functions as a natural removable partial denture (RPD) tooth abutment is unknown. PURPOSE: The purpose of this 3-dimensional finite element study was to analyze the biomechanical behavior of implant crown, bone, RPD, and IARPD. MATERIAL AND METHODS: Finite element models of the partial maxilla, teeth, and prostheses were generated on the basis of a patient's computed tomographic data...
November 30, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27904455/profiling-of-disease-related-metabolites-in-grapevine-internode-tissues-infected-with-agrobacterium-vitis
#7
Sung-Min Jung, Youn-Young Hur, John E Preece, Oliver Fiehn, Young-Ho Kim
Green shoot cuttings of 10 different grapevine species were inoculated with Agrobacterium vitis to find disease-related metabolites in the grapevine. Crown galls formed 60 days after inoculation varied in gall severity (GS) evaluated by gall incidence (GI) and gall diameter (GD), which were classified into three response types as RR (low GI and small GD), SR (high GI and small GD), and SS (high GI and large GD), corresponding to resistant, moderately resistant, and susceptible responses, respectively. In this, 4, 4, and 2 Vitis species were classified into RR, SR, and SS, respectively...
December 2016: Plant Pathology Journal
https://www.readbyqxmd.com/read/27904023/early-embryonic-development-of-long-tendons-in-the-human-foot
#8
Masahito Yamamoto, Yasuhiro Shiraishi, Kei Kitamura, Zhe Wu Jin, Gen Murakami, Jose Francisco Rodríguez-Vázquez, Shin-Ichi Abe
To examine a common plantar tendinous plate for long flexors of the toe and fingers in human embryos, we observed sections of 10 embryos at 5-6 weeks (crown-rump length or CRL 15-21 mm). The heel or tuber of the calcaneus was underdeveloped in 3 embryos with CRL 15 mm and the talus appeared not to be piled up on the calcaneus but these two bones were arranged along the lateromedial axis. As reported in the hand, we demonstrated, in the deep side of tarsal bones, a common tendinous plate formed by a joining of the flexor halluces longus and flexor digitorum longus tendons...
2016: Okajimas Folia Anatomica Japonica
https://www.readbyqxmd.com/read/27904021/scanning-electron-microscopic-study-on-the-tongues-of-seven-avian-species
#9
Shoichi Emura
The dorsal lingual surface of the grey crowned crane (Balearica regulorum), American flamingo (Phoenicopterus rubber), great egret (Ardea alba), mallard (Anas platyrhynchos), Himalayan monal (Lophophorus impejanus), black-necked stilt (himantopus mexicanus) and green macaw (Ara militaris) were examined by scanning electron microscopy. In the grey crowned crane, the surface of the lingual apex was relatively rough. Many openings of the lingual glands in both lateral regions of the lingual body were observed...
2016: Okajimas Folia Anatomica Japonica
https://www.readbyqxmd.com/read/27904020/is-the-ultimobranchial-body-a-reality-or-myth-a-study-using-serial-sections-of-human-embryos
#10
Yohei Honkura, Masahito Yamamoto, Toshihito Yoshimoto, Jose Francisco Rodriguez-Vazquez, Gen Murakami, Yukio Katori, Shin-Ichi Abe
Reported morphologies of the ultimobranchial body had varied between researchers: a cluster of mitotic cells, a duct-like structure and a rosette-like cell mass. To clarify the true morphology, we studied tilted horizontal sections of 20 human embryos (crown-rump length 5-18 mm; 4-6 weeks). The sections displayed a ladder-like arrangement of the second to fourth endodermal pouches and, in 5 early embryos we found the fifth pouch attached to the fifth ectodermal groove near the fourth pharyngeal arch artery...
2016: Okajimas Folia Anatomica Japonica
https://www.readbyqxmd.com/read/27903624/the-shark-heart-crowned
#11
William Joyce
No abstract text is available yet for this article.
December 1, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27902956/usefulness-of-cervical-computed-tomography-and-magnetic-resonance-imaging-for-rapid-diagnosis-of-crowned-dens-syndrome-a-case-report-and-review-of-the-literature
#12
Akihiro Inoue, Kanehisa Kohno, Satoko Ninomiya, Hitomi Tomita, Shinji Iwata, Shiro Ohue, Kenji Kamogawa, Kensho Okamoto, Shinya Fukumoto, Haruhisa Ichikawa, Shinji Onoue, Saya Ozaki, Bungo Okuda
INTRODUCTION: Crowned dens syndrome is a rare disease entity which radiologically shows calcification of the cruciform ligament around the odontoid process. We report a patient with crowned dens syndrome who improved dramatically in 5days following treatment with oral nonsteroidal anti-inflammatory medication. PRESENTATION OF CASE: A 61-year-old man was admitted to our hospital with a severe occipital headache and sudden onset of neck stiffness. Neurological examination on admission revealed a high fever and cervical rigidity...
November 23, 2016: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/27902868/the-tris-pentafluoroethyl-silanide-anion
#13
Nico Schwarze, Simon Steinhauer, Beate Neumann, Hans-Georg Stammler, Berthold Hoge
Tris(pentafluoroethyl)silane, which is conveniently accessible by the treatment of Si(C2 F5 )3 X (X=Cl, Br) with Bu3 SnH, was successfully employed for hydrosilylation reactions. In the presence of a palladium catalyst, hydrosilylation of phenylacetylene with Si(C2 F5 )3 H affords the product of an α-addition whereas the reaction of trimethylsilylacetylene with the silane leads to the β-trans product. Tris(pentafluoroethyl)silane can be deprotonated by sterically demanding bases such as lithium diisopropylamide at low temperatures to give the corresponding silanide ion...
November 30, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27901296/novel-forest-decline-triggered-by-multiple-interactions-among-climate-an-introduced-pathogen-and-bark-beetles
#14
Carmen M Wong, Lori D Daniels
Novel forest decline is increasing due to global environmental change, yet the causal factors and their interactions remain poorly understood. Using tree ring analyses, we show how climate and multiple biotic factors caused the decline of whitebark pine (Pinus albicaulis) in 16 stands in the southern Canadian Rockies. In our study area, 72% of whitebark pines were dead and 18% had partially dead crowns. Tree mortality peaked in the 1970s; however, the annual basal area increment of disturbed trees began to decline significantly in the late 1940s...
November 5, 2016: Global Change Biology
https://www.readbyqxmd.com/read/27901158/a-structural-study-of-alkaline-earth-metal-complexes-with-hybrid-disila-crown-ethers
#15
Fabian Dankert, Kirsten Reuter, Carsten Donsbach, Carsten von Hänisch
Compounds consisting of [M(1,2-disila-[3n]crown-n)](2+) (M = Mg, Ca, Sr, Ba; n = 5, 6) and [Ba(1,2-disila-benzo[18]crown-6)](2+) cations and different anions were obtained by equimolar reaction of the hybrid disila-crown ethers 1,2-disila[15]crown-5 (1), 1,2-disila[18]crown-6 (2) and 1,2-disila-benzo[18]crown-6 (7) with alkaline earth metal salts. Even with strongly coordinating anions such as Br(-) or I(-) stable complexes could be obtained, showing the good coordination ability of these ligands. The structures of all coordination compounds were determined via single crystal X-ray diffraction (XRD)...
November 30, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27897341/adaptive-self-assembly-behaviour-restrained-by-supramolecular-crystallization-and-molecular-recognition
#16
Seiji Shinkai, Bappaditya Roy, Takao Noguchi, Daisuke Yoshihara, Junji Sakamoto, Tatsuhiro Yamamoto
Recently, the supramolecular community is integrating different approaches to find converging ideas towards understanding the 'origin of life'. In this report, we have found an interesting adaptation trait, as like in Darwin's theory, in a bolaamphiphile molecule and established an environment friendly behaviour under non-covalent forces leading to evolve diverse assembly structures and interesting photo-physical properties. The perylene diimide (PDI)-based bolaamphiphile is used as a promising scaffold with great potential for the development of emerging supramolecular system...
November 29, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27895348/a-6-year-evaluation-of-223-tapered-dental-implants-and-associated-prosthesis-in-92-patients-at-a-university-hospital
#17
Sana Ehsen Nagi, Farhan Raza Khan, Rabia Ali
The aim of the retrospective study was to assess the clinical and radiographic outcome of the dental implant surgery and prosthetics. It was conducted at the Aga Khan University Hospital, Karachi, and comprised of medical charts and radiographic records of patients visiting between 2010 and 2015. Variables such as implant dimensions, final prosthesis, method of retention, loading protocol and patient factors were analysed. A total of 223 implants (143(64.1%) in maxilla and 80(35.9%) in mandible) were placed in 92 subjects (50(54...
October 2016: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/27895345/a-review-of-the-failed-cases-of-dental-implants-at-a-university-hospital-in-karachi-pakistan
#18
Farhan Raza Khan, Rabia Ali, Sana Ehsan Nagi
The retrospective study was conducted to assess the dental implants that experienced failure. It was conducted at the dental clinic of the Aga Khan University Hospital, Karachi, and comprised record of dental implants from July 2010 to June 2015. Variables such as patient age, gender and systemic status, length and diameter of implants, bone grafting, type of definitive prosthesis (crown or bridge or overdenture), nature of retention (cement versus screw retained), loading strategy (immediate versus delayed loading), etc...
October 2016: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/27892840/adhesive-cementation-promotes-higher-fatigue-resistance-to-zirconia-crowns
#19
F Campos, L F Valandro, S A Feitosa, C J Kleverlaan, A J Feilzer, N de Jager, M A Bottino
OBJECTIVE: The aim of this study was to investigate the influence of the cementation strategy on the fatigue resistance of zirconia crowns. The null hypothesis was that the cementation strategy would not affect the fatigue resistance of the crowns. METHODS AND MATERIALS: Seventy-five simplified molar tooth crown preparations were machined in glass fiber-filled epoxy resin. Zirconia crowns were designed (thickness=0.7 mm), milled by computer-aided design/computer-aided manufacturing, and sintered, as recommended...
November 28, 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27892564/zirconia-based-dental-ceramics-structure-mechanical-properties-biocompatibility-and-applications
#20
Chandkiram Gautam, Jarin Joyner, Amarendra Gautam, Jitendra Rao, Robert Vajtai
Zirconia (ZrO2) based dental ceramics have been considered to be advantageous materials with adequate mechanical properties for the manufacturing of medical devices. Due to its very high compression strength of 2000 MPa, ZrO2 can resist differing mechanical environments. During the crack propagation on the application of stress on the surface of ZrO2, a crystalline modification diminishes the propagation of cracks. In addition, zirconia's biocompatibility has been studied in vivo, leading to the observation of no adverse response upon the insertion of ZrO2 samples into the bone or muscle...
November 28, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
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