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https://www.readbyqxmd.com/read/29928035/are-femoroacetabular-impingement-tomographic-angles-associated-with-the-histological-assessment-of-labral-tears-a-cadaveric-study
#1
Leandro Ejnisman, Benjamin G Domb, Felipe Souza, Consuelo Junqueira, Jose Ricardo Negreiros Vicente, Alberto Tesconi Croci
PURPOSE: This study sought to investigate the association between tomographic femoroacetabular impingement (FAI) angles and histologically evaluated labral tears. The authors hypothesized that cadavers presenting with cam and pincer morphologies would present a higher prevalence of acetabular labral tears. METHODS: Twenty fresh cadavers were submitted to computed tomography. Standard FAI angles were measured, including the alpha angle, femoral version, acetabular version, Tonnis angle and center-edge angle...
2018: PloS One
https://www.readbyqxmd.com/read/29926720/iron-pcp-pincer-complexes-in-three-oxidation-states-reversible-ligand-protonation-to-afford-an-fe-0-complex-with-an-agostic-c-h-arene-bond
#2
Daniel Himmelbauer, Matthias Mastalir, Berthold Stöger, Luis F Veiros, Marc Pignitter, Veronika Somoza, Karl Kirchner
In the current investigation, the reaction of Fe2 (CO)9 with the ligand precursor 2-chloro-N1 ,N3 -bis(diisopropylphosphanyl)-N1 ,N3 -diethylbenzene-1,3-diamine (P(C-Cl)PNEt - iPr) (1) was investigated. When a suspension of Fe2 (CO)9 and 1 in CH3 CN was transferred in a sealed microwave glass vial and stirred for 18 h at 110 °C the complex [Fe(PCPNEt - iPr)(CO)2 Cl] (2) was obtained. In an attempt to prepare the hydride Fe(II) complex [Fe(PCPNEt - iPr)(CO)2 H] (3), 2 was reacted with 1 equiv of Li[HBEt3 ] in THF...
June 21, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29901669/electrocatalytic-proton-reduction-by-an-air-stable-nickel-ii-thiolato-pnn-pincer-complex
#3
Chew Pheng Yap, Yuan Yi Chong, Tsz Sian Chwee, Wai Yip Fan
We report an air-stable nickel(ii)-thiolato PNN pincer complex [(PNN)NiII(SC6H4Me)]+[MeC6H4SO3]- (PNN = 2-((di-tert-butylphosphinomethyl-6-diethylaminomethyl)pyridine)) which is capable of reducing protons at an overpotential of 0.54 V at low acid concentrations. The proton reduction can be catalysed using weak or strong acids such as acetic acid and trifluoroacetic acid respectively. In contrast, the chloro and nitrate derivatives of the nickel pincer complex behave as poorer catalysts. A mechanism accounting for the role of the ligand in proton reduction is also briefly outlined...
June 14, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29894175/h-2-addition-to-pincer-iridium-complexes-yielding-trans-dihydride-products-unexpected-correlations-of-bond-strength-with-bond-length-and-vibrational-frequencies
#4
Boushra S Omar, Josephina Mallah, Mohamad Ataya, Bo Li, Xiaoguang Zhou, Santanu Malakar, Alan S Goldman, Faraj Hasanayn
R4 PONOP-Ir-Me (R 1) and R4 POCOP-Ir-CO (R 2), R = t Bu or i Pr, are known to undergo acid-catalyzed oxidative addition of H2 that yields octahedral products with two hydrides in a trans-configuration. We use density functional theory to study the free energies (Δ Gtrans ) and equilibrium isotope effects (EIEtrans ) for H2 /D2 addition to R 1, R 2, and related complexes for R = t Bu, i Pr, and Me. For a given R, reaction of R 1 is ∼5 kcal/mol more exergonic than R 2. For a given subclass of complexes, Δ Gtrans is more exergonic for the smaller R...
June 12, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29893223/hip-arthroscopy-versus-best-conservative-care-for-the-treatment-of-femoroacetabular-impingement-syndrome-uk-fashion-a-multicentre-randomised-controlled-trial
#5
Damian R Griffin, Edward J Dickenson, Peter D H Wall, Felix Achana, Jenny L Donovan, James Griffin, Rachel Hobson, Charles E Hutchinson, Marcus Jepson, Nick R Parsons, Stavros Petrou, Alba Realpe, Joanna Smith, Nadine E Foster
BACKGROUND: Femoroacetabular impingement syndrome is an important cause of hip pain in young adults. It can be treated by arthroscopic hip surgery, including reshaping the hip, or with physiotherapist-led conservative care. We aimed to compare the clinical effectiveness of hip arthroscopy with best conservative care. METHODS: UK FASHIoN is a pragmatic, multicentre, assessor-blinded randomised controlled trial, done at 23 National Health Service hospitals in the UK...
June 2, 2018: Lancet
https://www.readbyqxmd.com/read/29892594/mixed-type-femoroacetabular-impingement-associated-with-subspine-impingement-recognizing-the-trifocal-femoropelvic-impingement
#6
Bruno Gonçalves Schröder E Souza, Ranieri Monteiro Cardoso, Rodrigo Silva Loque, Luiz Fernando Ribeiro Monte, José Paulo Sabino, Valdeci Manoel de Oliveira
To describe the arthroscopic surgical technique for subspine impingement (SSI) of the anterior inferior iliac spine (AIIS) associated with mixed type femoroacetabular impingement (FAI), through two standard arthroscopic portals (anterolateral and distal mid-anterior) in two patients with trifocal impingement. The authors report the cases of two young male patients, aged 32 and 36 years old, with trifocal femoropelvic impingement (TFPI). The technique consists of segmental capsulectomy, arthroscopic dissection of the AIIS, partial release of the direct head of the rectus femoris, resection of the AIIS projection with a burr and with fluoroscopic aid, correction of the pincer deformity, repair of the labrum with bioabsorbable anchors, and femoral osteoplasty...
May 2018: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/29888483/ruthenium-pincer-catalyzed-hydrogenation-of-lactams-to-aminoalcohols
#7
Tao Tu, Jiangbo Chen, Jiaquan Wang
By using commercial available ruthenium pincer complex (Ru-MACHO-BH) as a catalyst, the challenging direct hydrogenation of lactams and analogues has been accomplished to successfully delivery corresponding value-added aminoalcohols in good to excellent yields under mild reaction conditions. Remarkably, besides N-protected lactams, unprotected ones could also be readily reduced in the presence of a catalytic amount of weak base or even under neutral reaction conditions, further highlighting broad substrate scopes and the protocol efficiency...
June 10, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29887527/biosynthesis-of-the-nickel-pincer-nucleotide-cofactor-of-lactate-racemase-requires-a-ctp-dependent-cyclometallase
#8
Benoît Desguin, Matthias Fellner, Olivier Riant, Jian Hu, Robert Hausinger, Pascal Hols, Patrice Soumillion
Bacterial lactate racemase is a nickel-dependent enzyme that contains a cofactor, nickel pyridinium-3,5-bisthiocarboxylic acid mononucleotide, hereafter named nickel-pincer nucleotide (NPN). The LarC enzyme from the bacterium Lactobacillus plantarum participates in NPN biosynthesis by inserting nickel ion into pyridinium-3,5-bisthiocarboxylic acid mononucleotide,. This reaction, known in organometallic chemistry as a cyclometalation, is characterized by the formation of new metal-carbon and metal-sulfur σ bonds...
June 10, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29876863/professional-soccer-is-associated-with-radiographic-cam-and-pincer-hip-morphology
#9
Guilherme Guadagnini Falotico, Gustavo Gonçalves Arliani, André Fukunishi Yamada, Artur da Rocha Correa Fernandes, Benno Ejnisman, Moises Cohen
PURPOSE: Femoroacetabular impingement (FAI) syndrome is characterized by a triad: symptoms, clinical signs and imaging findings. Some individuals, especially athletes, have only imaging alterations. The objective of this study was to evaluate the prevalence of cam and pincer morphology in professional soccer players compared with a control group of non-athletes and to investigate the association between the age at which players start playing competitive soccer more than three times per week and duration of the soccer career with the prevalence of these radiographic findings...
June 6, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29876130/prevalence-and-morphological-features-of-acetabular-dysplasia-with-coexisting-femoroacetabular-impingement-related-findings-in-a-japanese-population-a-computed-tomography-based-cross-sectional-study
#10
Tomohiro Mimura, Kanji Mori, Yuki Furuya, Shin Itakura, Taku Kawasaki, Shinji Imai
The coexistence of acetabular dysplasia (AD) and femoroacetabular impingement (FAI) has not been well discussed. This study was performed to elucidate the prevalence and morphological features of AD with coexisting FAI-related findings in a Japanese population. Computed tomography images were retrospectively evaluated. AD was classified as definite or borderline. The morphological findings that defined cam deformity were an α angle of ≥55°, head-neck offset ratio (HNOR) of <0.13, pistol grip deformity positivity and herniation pit positivity...
July 2018: Journal of Hip Preservation Surgery
https://www.readbyqxmd.com/read/29874060/magnetism-and-epr-studies-of-binuclear-ruthenium-hydride-binuclear-species-bearing-redox-active-ligands
#11
Michael E Noss, Noah L Wieder, Patrick J Carroll, Michael J Zdilla, Donald H Berry
The binuclear complex {[N3 ]Ru(H)}2 (μ-η1 :η1 -N2 ) ([N3 ] = 2,6-(ArylN═CMe)2 C5 H3 N and Aryl = mesityl or xylyl) contains two formally Ru(I), d7 centers linked by a bridging dinitrogen ligand, although the odd electrons are substantially delocalized onto the redox non-innocent pincer ligands. The complex exhibits paramagnetic behavior in solution, but is diamagnetic in the solid state. This difference is attributed to intermolecular "π-stacking" observed in the solid state, which essentially couples unpaired electrons on each half of the complex to form delocalized 22-center-2-electron covalent bonds...
June 6, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29869657/acetylacetonato-based-pincer-type-nickel-ii-complexes-synthesis-and-catalysis-in-cross-couplings-of-aryl-chlorides-with-aryl-grignard-reagents
#12
Erika Asano, Yuki Hatayama, Nobutaka Kurisu, Atsufumi Ohtani, Toru Hashimoto, Youji Kurihara, Kazuyoshi Ueda, Shinji Ishihara, Hirotaka Nagao, Yoshitaka Yamaguchi
In this work, three different types of acetylacetonato-based pincer-type nickel(ii) complexes (2) were prepared. Complex 2a possessed the tridentate ONN ligand, which was constructed by the condensation reaction of acetylacetone with N,N-diethylethylenediamine. Complex 2b contained the PPh2 donor group in contrast to the NEt2 group in 2a, i.e., an ONP ligand framework. Complex 2c was composed of the NNN ligand, which was prepared by the reaction of 4-((2,4,6-trimethylphenyl)amino)pent-3-en-2-one with N,N-diethylethylenediamine...
June 5, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29868411/computer-assisted-hip-arthroscopic-surgery-for-femoroacetabular-impingement
#13
Naomi Kobayashi, Yutaka Inaba, So Kubota, Shota Higashihira, Hyonmin Choe, Hiroyuki Ike, Daigo Kobayashi, Tomoyuki Saito
Precise osteochondroplasty is key for success in hip arthroscopic surgery, especially for femoroacetabular impingement (FAI) caused by cam or pincer morphology. In this Technical Note, we present computer-assisted hip arthroscopic surgery for FAI, including preoperative planning by virtual osteochondroplasty and intraoperative computer navigation assistance. The important concept of this technique is that navigation assistance for osteochondroplasty is based on planning made by computer simulation analysis...
April 2018: Arthroscopy Techniques
https://www.readbyqxmd.com/read/29863334/isoelectronic-manganese-and-iron-hydrogenation-dehydrogenation-catalysts-similarities-and-divergences
#14
Nikolaus Gorgas, Karl Kirchner
Sustainable processes that utilize nontoxic, readily available, and inexpensive starting materials for organic synthesis constitute a major objective in modern chemical research. In this context, it is highly important to perform reactions under catalytic conditions and to replace precious metal catalysts by earth-abundant nonprecious metal catalysts. In particular, iron and manganese are promising candidates, as these are among the most abundant metals in the earth's crust, are inexpensive, and exhibit a low environmental impact...
June 4, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29860842/unlocking-structural-diversity-in-gold-iii-hydrides-unexpected-interplay-of-cis-trans-influence-on-stability-insertion-chemistry-and-nmr-chemical-shifts
#15
Luca Rocchigiani, Julio Fernandez-Cestau, Isabelle Chambrier, Peter Hrobárik, Manfred Bochmann
The synthesis of new families of stable or at least spectroscopically observable gold(III) hydride complexes is reported, including anionic cis-hydrido chloride, hydrido aryl and cis-dihydride complexes. Reactions between (C^C)AuCl(PR3) and LiHBEt3 afford the first examples of gold(III) phosphino hydrides (C^C)AuH(PR3) (R = Me, Ph, p-tolyl; C^C = 4,4'-di-tert-butylbiphenyl-2,2'-diyl). The X-ray structure of (C^C)AuH(PMe3) was determined. LiHBEt3 reacts with (C^C)AuCl(py) to give [(C^C)Au(H)Cl] , whereas (C^C)AuH(PR3) undergoes phosphine displacement, generating the dihydride [(C^C)AuH2] ...
June 4, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29850692/synthesis-of-rh-iii-thiophosphinito-pincer-hydrido-complexes-by-base-free-c-h-bond-activation-at-room-temperature
#16
G Vlahopoulou, S Möller, J Haak, P Hasche, H-J Drexler, D Heller, T Beweries
Rhodium(iii) thiophosphinito pincer hydrido complexes were synthesised by C-H activation under exceptionally mild conditions at room temperature without additional base or irradiation and fully characterised by multinuclear NMR spectroscopy and X-ray crystallography. C-H activation under these mild conditions contrasts with the reactivity of related systems with POCOP ligands.
May 31, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29850078/crystal-structure-of-an-iridium-iii-complex-of-the-c-dppm-2-pcp-pincer-ligand-system-and-its-conjugate-ch-acid-form
#17
Christian Reitsamer, Inge Schlapp-Hackl, Gabriel Partl, Walter Schuh, Holger Kopacka, Klaus Wurst, Paul Peringer
After the successful creation of the newly designed PCP carbodi-phospho-rane (CDP) ligand [Reitsamer et al. (2012 ▸). Dalton Trans. 41 , 3503-3514; Stallinger et al. (2007 ▸). Chem. Commun. pp. 510-512], the treatment of this PCP pincer system with the transition metal iridium and further the analysis of the structures by single-crystal diffraction and by NMR spectroscopy were of major inter-est. Two different iridium complexes, namely (bis-{[(di-phenyl-phosphan-yl)meth-yl]di-phenyl-phosphanyl-idene}methane-κ3 P , C , P ')carbonyl-chlorido-hydridoiridium(III) chloride di-chloro-methane tris-olvate, [IrIII (CO){C(dppm)2 -κ3 P , C , P '}ClH]Cl·3CH2 Cl2 ( 1 ) and the closely related (bis-{[(di-phenyl-phosphan-yl)meth-yl]di-phenyl-phosphanyl-idene}methanide(1+)-κ3 P , C , P ')carbonyl-chlorido-hy-dridoirid-ium(III) dichloride-hydro-chloric acid-water (1/2/5...
May 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/29812933/co-oxidation-by-n2o-homogeneously-catalyzed-by-ruthenium-hydride-pincer-complexes-indicating-a-new-mechanism
#18
Rong Zeng, Moran Feller, Yael Diskin-Posner, Linda J W Shimon, Yehoshoa Ben-David, David Milstein
Both CO and N2O are important environmentally harmful industrial gases. The reaction of CO and N2O to produce CO2 and N2 has stimulated much research interest aimed at degradation of these two gases in a single step. Herein, we report an efficient CO oxidation by N2O catalyzed by a (PNN)Ru-H pincer complex under mild conditions, even with no added base. The reaction is proposed to proceed through a sequence of O-atom transfer (OAT) from N2O to the Ru-H bond to form a Ru-OH intermediate, followed by intramolecular OH attack on an adjacent CO ligand, forming CO2 and N2...
May 29, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29806720/manganese-catalyzed-direct-olefination-of-methylheteroarenes-with-primary-alcohols
#19
Milan K Barman, Satyadeep Waiba, Biplab Maji
Herein, we present the first example of catalytic direct olefination of methylheteroarenes using primary alcohols via acceptorless dehydrogenative coupling of alcohols and methylheteroarenes. The reaction is catalyzed by an Earth's abundant transition metal (manganese) stabilized by a bench stable NNN-pincer ligand derived from 2-hydrazinylpyridine. The reaction is highly environmentally benign producing only hydrogen and water as byproducts. A large number of (E)-disubstituted olefins were selectively obtained in high efficiency...
May 28, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29797280/touch-the-table-before-the-target-contact-with-an-underlying-surface-may-assist-the-development-of-precise-visually-controlled-reach-and-grasp-movements-in-human-infants
#20
Jenni M Karl, Alexis M Wilson, Marisa E Bertoli, Noor S Shubear
Multiple motor channel theory posits that skilled hand movements arise from the coordinated activation of separable neural circuits in parietofrontal cortex, each of which produces a distinct movement and responds to different sensory inputs. Prehension, the act of reaching to grasp an object, consists of at least two movements: a reach movement that transports the hand to a target location and a grasp movement that shapes and closes the hand for target acquisition. During early development, discrete pre-reach and pre-grasp movements are refined based on proprioceptive and tactile feedback, but are gradually coordinated together into a singular hand preshaping movement under feedforward visual control...
May 24, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
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