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https://www.readbyqxmd.com/read/29767949/topotactic-growth-of-edge-terminated-mos-2-from-moo-2-nanocrystals
#1
Christian Dahl-Petersen, Manuel Sarić, Michael Brorson, Poul Georg Moses, Jan Rossmeisl, Jeppe V Lauritsen, Stig Helveg
Layered transition metal dichalcogenides have distinct physicochemical properties at their edge-terminations. The production of an abundant density of edge structures is, however, impeded by the excess surface energy of edges compared to basal planes and would benefit from insight into the atomic growth mechanisms. Here, we show that edge-terminated MoS2 nanostructures can form during sulfidation of MoO2 nanocrystals by using in situ transmission electron microscopy (TEM). Time-resolved TEM image series reveal that the MoO2 surface can sulfide by inward progression of MoO2 (20-2):MoS2 (002) interfaces resulting in upright-oriented and edge-exposing MoS2 sheets...
May 16, 2018: ACS Nano
https://www.readbyqxmd.com/read/29682356/mediastinal-hematoma-and-tracheal-compression-following-transradial-percutaneous-coronary-intervention
#2
Nathaniel R Smilowitz, Muhamed Saric, Michael J Attubato, James N Slater
Vascular complications from transradial percutaneous coronary intervention (PCI) are rare. We report an unusual case of stridor after PCI due to brachiocephalic artery perforation, pseudoaneurysm formation, and development of a large mediastinal hematoma with tracheal compression. Endovascular repair of the brachiocephalic artery was achieved with covered stent placement at the neck of the pseudoaneurysm. This case highlights the importance of careful guide catheter placement from the right radial approach...
2018: Case Reports in Cardiology
https://www.readbyqxmd.com/read/29667410/controlling-cargo-trafficking-in-multicomponent-membranes
#3
Tine Curk, Peter Wirnsberger, Jure Dobnikar, Daan Frenkel, Andela Saric
Biological membranes typically contain a large number of different components dispersed in small concentrations in the main membrane phase, including proteins, sugars, and lipids of varying geometrical properties. Most of these components do not bind the cargo. Here, we show that such `inert' components can be crucial for precise control of cross-membrane trafficking. Using a statistical mechanics model and molecular dynamics simulations, we demonstrate that the presence of inert membrane components of small isotropic curvatures dramatically influences cargo endocytosis, even if the total spontaneous curvature of such a membrane remains unchanged...
April 18, 2018: Nano Letters
https://www.readbyqxmd.com/read/29581486/distinct-thermodynamic-signatures-of-oligomer-generation-in-the-aggregation-of-the-amyloid-%C3%AE-peptide
#4
Samuel I A Cohen, Risto Cukalevski, Thomas C T Michaels, Anđela Šarić, Mattias Törnquist, Michele Vendruscolo, Christopher M Dobson, Alexander K Buell, Tuomas P J Knowles, Sara Linse
Mapping free-energy landscapes has proved to be a powerful tool for studying reaction mechanisms. Many complex biomolecular assembly processes, however, have remained challenging to access using this approach, including the aggregation of peptides and proteins into amyloid fibrils implicated in a range of disorders. Here, we generalize the strategy used to probe free-energy landscapes in protein folding to determine the activation energies and entropies that characterize each of the molecular steps in the aggregation of the amyloid-β peptide (Aβ42), which is associated with Alzheimer's disease...
March 26, 2018: Nature Chemistry
https://www.readbyqxmd.com/read/29502589/intraoperative-two-and-three-dimensional-transesophageal-echocardiography-in-combined-myectomy-mitral-operations-for-hypertrophic-cardiomyopathy
#5
REVIEW
Robert G Nampiaparampil, Daniel G Swistel, Michael Schlame, Muhamed Saric, Mark V Sherrid
Transesophageal echocardiography is essential in guiding the surgical approach for patients with obstructive hypertrophic cardiomyopathy. Septal hypertrophy, elongated mitral valve leaflets, and abnormalities of the subvalvular apparatus are prominent features, all of which may contribute to left ventricular outflow tract obstruction. Surgery aims to alleviate the obstruction via an extended myectomy, often with an intervention on the mitral valve and subvalvular apparatus. The goal of intraoperative echocardiography is to assess the anatomic pathology and pathophysiology in order to achieve a safe intraoperative course and a successful repair...
March 2018: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/29490200/chemical-kinetics-for-bridging-molecular-mechanisms-and-macroscopic-measurements-of-amyloid-fibril-formation
#6
Thomas C T Michaels, Anđela Šarić, Johnny Habchi, Sean Chia, Georg Meisl, Michele Vendruscolo, Christopher M Dobson, Tuomas P J Knowles
Understanding how normally soluble peptides and proteins aggregate to form amyloid fibrils is central to many areas of modern biomolecular science, ranging from the development of functional biomaterials to the design of rational therapeutic strategies against increasingly prevalent medical conditions such as Alzheimer's and Parkinson's diseases. As such, there is a great need to develop models to mechanistically describe how amyloid fibrils are formed from precursor peptides and proteins. Here we review and discuss how ideas and concepts from chemical reaction kinetics can help to achieve this objective...
April 20, 2018: Annual Review of Physical Chemistry
https://www.readbyqxmd.com/read/29489461/simultaneous-venoarterial-extracorporeal-membrane-oxygenation-and-percutaneous-left-ventricular-decompression-therapy-with-impella-is-associated-with-improved-outcomes-in-refractory-cardiogenic-shock
#7
Sandeep M Patel, Jerry Lipinski, Sadeer G Al-Kindi, Toral Patel, Petar Saric, Jun Li, Fahd Nadeem, Thomas Ladas, Amer Alaiti, Ann Phillips, Benjamin Medalion, Salil Deo, Yakov Elgudin, Marco A Costa, Mohammed Najeeb Osman, Guilherme F Attizzani, Guilherme H Oliveira, Basar Sareyyupoglu, Hiram G Bezerra
Venoarterial extracorporeal membrane oxygenation (VA-ECMO) has been used for refractory cardiogenic shock; however, it is associated with increased left ventricular afterload. Outcomes associated with the combination of a percutaneous left ventricular assist device (Impella) and VA-ECMO remains largely unknown. We retrospectively reviewed patients treated for refractory cardiogenic shock with VA-ECMO (2014-2016). The primary outcome was all-cause mortality within 30 days of VA-ECMO implantation. Secondary outcomes included duration of support, stroke, major bleeding, hemolysis, inotropic score, and cardiac recovery...
February 27, 2018: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29469777/hormonal-therapies-for-hidradenitis-suppurativa-review
#8
REVIEW
Ashley K Clark, Rebecca L Quinonez, Suzana Saric, Raja K Sivamani
Hidradenitis suppurativa is a recurrent inflammatory skin condition characterized by abscesses and boils, predominantly in the groin, armpit, and buttocks areas. HS is not a life-threatening condition, but severely impairs quality of life in those affected. Finding a successful treatment approach for HS has been challenging, in part because of the lack of a gold-standard treatment method, limited research-based information, and the nature of clinical variation in the disease. Treatment commonly consists of antibiotics, anti-inflammatory therapy, hormonal therapy, and more invasive clinical procedures...
November 12, 2017: Dermatology Online Journal
https://www.readbyqxmd.com/read/29420019/environment-of-the-eu-3-ion-within-nanocrystalline-eu-doped-baal-2-o-4-correlation-of-x-ray-diffraction-m%C3%A3-ssbauer-spectroscopy-x-ray-absorption-spectroscopy-and-photoluminescence-investigations
#9
Biserka Gržeta, Dirk Lützenkirchen-Hecht, Martina Vrankić, Sanja Bosnar, Ankica Šarić, Masashi Takahashi, Dimitar Petrov, Marijan Bišćan
Powder samples of pure BaAl2 O4 and doped with 4.9 atom % Eu in relation to Ba were prepared by a hydrothermal route. The samples were characterized by X-ray diffraction, 151 Eu Mössbauer spectroscopy, synchrotron-based X-ray absorption spectroscopy at the Ba L3 - and Eu L3 -edges, and photoluminescence measurements. Diffraction lines were broadened, indicating that the samples were nanocrystallline. The samples possessed a hexagonal crystal structure, space group P63 . 151 Eu Mössbauer spectroscopy revealed the presence of Eu in the 3+ oxidation state...
February 19, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29350911/a-programmable-dna-origami-platform-for-organizing-intrinsically-disordered-nucleoporins-within-nanopore-confinement
#10
Patrick D Ellis Fisher, Qi Shen, Bernice Akpinar, Luke K Davis, Kenny Kwok Hin Chung, David Baddeley, Anđela Šarić, Thomas J Melia, Bart W Hoogenboom, Chenxiang Lin, C Patrick Lusk
Nuclear pore complexes (NPCs) form gateways that control molecular exchange between the nucleus and the cytoplasm. They impose a diffusion barrier to macromolecules and enable the selective transport of nuclear transport receptors with bound cargo. The underlying mechanisms that establish these permeability properties remain to be fully elucidated but require unstructured nuclear pore proteins rich in Phe-Gly (FG)-repeat domains of different types, such as FxFG and GLFG. While physical modeling and in vitro approaches have provided a framework for explaining how the FG network contributes to the barrier and transport properties of the NPC, it remains unknown whether the number and/or the spatial positioning of different FG-domains along a cylindrical, ∼40 nm diameter transport channel contributes to their collective properties and function...
February 27, 2018: ACS Nano
https://www.readbyqxmd.com/read/29318322/persistent-organochlorine-pollutants-in-placentas-sampled-from-women-in-croatia-and-an-evaluation-of-their-dna-damaging-potential-in-vitro
#11
Davor Želježić, Snježana Herceg Romanić, Darija Klinčić, Marijana Matek Sarić, Judita Grzunov Letinić
This study investigated the levels and distribution of 17 polychlorinated biphenyls (PCBs) and organochlorine pesticides (HCB, α-HCH, β-HCH, γ-HCH, p,p'-DDE, p,p'-DDD, and p,p'-DDT) in placenta samples from women living in the coastal area of Croatia. During November 2012 to February 2013, 51 placenta samples were collected from healthy mothers. This study presents the first report about Croatian placenta samples. Each of the analysed compounds were found in all of the samples; all of the maximum values were < 1 ng g-1 w...
February 2018: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29296664/long-range-organization-of-membrane-curving-proteins
#12
Mijo Simunovic, Anđela Šarić, J Michael Henderson, Ka Yee C Lee, Gregory A Voth
Biological membranes have a central role in mediating the organization of membrane-curving proteins, a dynamic process that has proven to be challenging to probe experimentally. Using atomic force microscopy, we capture the hierarchically organized assemblies of Bin/amphiphysin/Rvs (BAR) proteins on supported lipid membranes. Their structure reveals distinct long linear aggregates of proteins, regularly spaced by up to 300 nm. Employing accurate free-energy calculations from large-scale coarse-grained computer simulations, we found that the membrane mediates the interaction among protein filaments as a combination of short- and long-ranged interactions...
December 27, 2017: ACS Central Science
https://www.readbyqxmd.com/read/29226380/acute-severe-mitral-regurgitation-after-blunt-chest-trauma
#13
Petar Saric, Benjamin D Ravaee, Toral R Patel, Brian D Hoit
Myocardial contusion and aortic injury are well-known cardiac complications of blunt chest trauma, but valvular injury is rare. Traumatic valve injuries most commonly involve the aortic valve, with isolated mitral valve injury being quite rare. We report a case of acute severe mitral regurgitation due to ruptured chordae tendineae requiring surgical repair following a motor vehicle accident.
February 2018: Echocardiography
https://www.readbyqxmd.com/read/29158017/left-atrial-appendage-occlusion-exclusion-procedural-image-guidance-with-transesophageal-echocardiography
#14
REVIEW
Alan F Vainrib, Serge C Harb, Wael Jaber, Ricardo J Benenstein, Anthony Aizer, Larry A Chinitz, Muhamed Saric
Atrial fibrillation is the most common arrhythmia worldwide and is a major risk factor for embolic stroke. In this article, the authors describe the crucial role of two- and three-dimensional transesophageal echocardiography in the pre- and postprocedural assessment and intraprocedural guidance of percutaneous left atrial appendage (LAA) occlusion procedures. Although recent advances have been made in the field of systemic anticoagulation with the novel oral anticoagulants, these medications come with a significant risk for bleeding and are contraindicated in many patients...
November 17, 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/29147538/scaling-behaviour-and-rate-determining-steps-in-filamentous-self-assembly
#15
Georg Meisl, Luke Rajah, Samuel A I Cohen, Manuela Pfammatter, Anđela Šarić, Erik Hellstrand, Alexander K Buell, Adriano Aguzzi, Sara Linse, Michele Vendruscolo, Christopher M Dobson, Tuomas P J Knowles
The formation of filaments from naturally occurring protein molecules is a process at the core of a range of functional and aberrant biological phenomena, such as the assembly of the cytoskeleton or the appearance of aggregates in Alzheimer's disease. The macroscopic behaviour associated with such processes is remarkably diverse, ranging from simple nucleated growth to highly cooperative processes with a well-defined lagtime. Thus, conventionally, different molecular mechanisms have been used to explain the self-assembly of different proteins...
October 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29135093/evaluation-of-safety-of-bevacizumab-as-second-line-treatment-of-patients-with-metastatic-colorectal-cancer
#16
Vladimir Todorovic, Nada Cicmil Saric, Jadranka Lakicevic, Milan Sorat
PURPOSE: Bevacizumab is a relatively new monoclonal antibody introduced in the treatment of metastatic colorectal cancer (CRC). Since varied efficiency and adverse events of this drug were reported, the purpose of this study was to assess the safety of bevacizumab as second-line treatment of patients with metastatic CRC. METHODS: This observational, non-interventional study involved 35 patients with metastatic CRC treated with bevacizumab. Patients were from the Oncology Clinic, Clinical Centre of Montenegro...
September 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/29133340/effects-of-hawthorn-crataegus-pentagyna-leaf-extract-on-electrophysiologic-properties-of-cardiomyocytes-derived-from-human-cardiac-arrhythmia-specific-induced-pluripotent-stem-cells
#17
Sara Pahlavan, Marziyeh Shalchi Tousi, Mahdi Ayyari, Abolfazl Alirezalu, Hassan Ansari, Tomo Saric, Hossein Baharvand
Cardiac arrhythmias are major life-threatening conditions. The landmark discovery of induced pluripotent stem cells has provided a promising in vitro system for modeling hereditary cardiac arrhythmias as well as drug development and toxicity testing. Nowadays, nutraceuticals are frequently used as supplements for cardiovascular therapy. Here we studied the cardiac effects of hawthorn ( Crataegus pentagyna) leaf extract using cardiomyocytes (CMs) differentiated from healthy human embryonic stem cells, long QT syndrome type 2 (LQTS2), and catecholaminergic polymorphic ventricular tachycardia type 1 (CPVT1) patient-specific induced pluripotent stem cells...
March 2018: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29119945/mechanical-force-induces-mitochondrial-fission
#18
Sebastian Carsten Johannes Helle, Qian Feng, Mathias J Aebersold, Luca Hirt, Raphael R Grüter, Afshin Vahid, Andrea Sirianni, Serge Mostowy, Jess G Snedeker, Anđela Šarić, Timon Idema, Tomaso Zambelli, Benoît Kornmann
Eukaryotic cells are densely packed with macromolecular complexes and intertwining organelles, continually transported and reshaped. Intriguingly, organelles avoid clashing and entangling with each other in such limited space. Mitochondria form extensive networks constantly remodeled by fission and fusion. Here, we show that mitochondrial fission is triggered by mechanical forces. Mechano-stimulation of mitochondria - via encounter with motile intracellular pathogens, via external pressure applied by an atomic force microscope, or via cell migration across uneven microsurfaces - results in the recruitment of the mitochondrial fission machinery, and subsequent division...
November 9, 2017: ELife
https://www.readbyqxmd.com/read/29114442/ta-2-n-3-nanocrystals-grown-in-al-2-o-3-thin-layers
#19
Krešimir Salamon, Maja Buljan, Iva Šarić, Mladen Petravić, Sigrid Bernstorff
Tantalum nitride nanoparticles (NPs) and cubic bixbyite-type Ta2 N3 nanocrystals (NCs) were grown in (Ta-N+Al2 O3 )/Al2 O3 periodic multilayers (MLs) after thermal treatment. The MLs were prepared by magnetron deposition at room temperature and characterized using grazing incidence small-angle X-ray scattering (GISAXS), X-ray reflectivity (XRR), grazing incidence X-ray diffraction (GIXRD), secondary ion mass spectrometry (SIMS) and X-ray photoelectron spectroscopy (XPS). We found amorphous tantalum nitride NPs at 600-800 °C, with a high degree of ordering along the surface normal and short-range ordering within the layers containing tantalum (metallic layers)...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29109660/the-quality-of-life-in-chronic-patients-in-the-process-of-rehabilitation
#20
Alma Glinac, Lejla Matovic, Edina Saric, Vesna Bratovcic, Selma Sinanovic
Objective: The aim of this study was to examine whether there is a correlation between self-evaluated quality of life, anxiety, depression, motivation, subjective-rated financial status, education, age and autonomous movements in patients with chronic conditions. Respondents and Methods: The study consecutively included 68 chronically ill patients, the average chronological age of 56.21 years. The Hospital Anxiety and Depression Scale for self-evaluation of the quality of life of respondents was used to evaluate the presence of anxiety and depression, the Quality of Life Enjoyment and Satisfaction Questionnaire-Short Form was used for self-evaluation of the quality of life, and the Visual analogue scale of motivation was used for self-evaluation of the level of motivation...
September 2017: Materia Socio-medica
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