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https://www.readbyqxmd.com/read/28441214/the-osteo-odonto-keratoprosthesis
#1
Mehran Zarei-Ghanavati, Venkata Avadhanam, Alfonso Vasquez Perez, Christopher Liu
PURPOSE OF REVIEW: To describe the practice of and recent developments in the osteo-odonto-keratoprosthesis. RECENT FINDINGS: Formal psychological assessment and support have been described. A sub-aqua system for fashioning the osteo-odonto-keratoprosthesis lamina; adoption of thicker laminae; use of bisphosphonate drugs; advances in laminar imaging; and use of bone augmentation and bone morphogenetic protein have been described for prevention, detection, and management of laminar resorption...
April 24, 2017: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/28439978/simulation-of-commercial-vs-theoretically-optimised-contact-lenses-for-presbyopia
#2
Richard Legras, David Rio
PURPOSE: To compare theoretically optimised bifocal contact lens optical designs to commercially available optical designs for presbyopia. METHODS: Retinal images were simulated, using a numerical eye model, from -6 (i.e., near vision) to +2 D for each 0.25 D. Ten optical profiles were simulated. Four of them corresponded to commercial contact lenses (i.e., Acuvue Oasys for Presbyopia®, Air Optix Aqua Multifocal®, Purevision Multifocal® and Distance Biofinity Multifocal®)...
May 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/28437922/from-toes-to-top-of-atmosphere-fowler-s-sneaker-depth-index-of-water-clarity-for-the-chesapeake-bay
#3
Benjamin Crooke, Lachlan I W McKinna, Ivona Cetinić
Fowler's Sneaker Depth (FSD), analogous to the well known Secchi disk depth (Zsd), is a visually discerned citizen scientist metric used to assess water clarity in the Patuxent River estuary. In this study, a simple remote sensing algorithm was developed to derive FSD from space-borne spectroradiometric imagery. An empirical model was formed that estimates FSD from red-end remote sensing reflectances at 645 nm, Rrs(645). The model is based on a hyperbolic function relating water clarity to Rrs(645) that was established using radiative transfer modeling and fine tuned using in-water FSD measurements and coincident Rrs(645) data observed by NASA's Moderate Resolution Imaging Spectroradiometer aboard the Aqua spacecraft (MODISA)...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28435734/crystal-structure-of-tetra-aqua-bis-pyrimidin-1-ium-4-6-diolato-%C3%AE%C2%BAo-4-manganese-ii
#4
Khaled A Shennara, Ray J Butcher, Frederick T Greenaway
The Mn(II) ion in the structure of the mononuclear title compound, [Mn(C4H3N2O2)2(H2O)4], is situated on an inversion center and is coordinated by two O atoms from two deprotonated 4,6-di-hydroxy-pyrimidine ligands and by four O atoms from water mol-ecules giving rise to a slightly distorted octa-hedral coordination sphere. The complex includes an intra-molecular hydrogen bond between an aqua ligand and the non-protonated N ring atom. The extended structure is stabilized by inter-molecular hydrogen bonds between aqua ligands, by hydrogen bonds between N and O atoms of the ligands of adjacent mol-ecules, and by hydrogen bonds between aqua ligands and the non-coordinating O atom of an adjacent mol-ecule...
April 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28435698/crystal-structure-of-di-aqua-bis-4-cyano-pyridine-%C3%AE%C2%BAn-bis-thio-cyanato-%C3%AE%C2%BAn-iron-ii-4-cyano-pyridine-disolvate
#5
Aleksej Jochim, Inke Jess, Christian Näther
The asymmetric unit of the title compound, [Fe(NCS)2(C6H4N2)2(H2O)2]·2C6H4N2, comprises one Fe(II) cation occupying an inversion centre as well as one thio-cyanate anion, one water mol-ecule and two 4-cyano-pyridine mol-ecules in general positions. The iron cations are coordinated by two N-bonded thiocyanate anions, two (pyridine)N-bonded 4-cyano-pyridine ligands and two water mol-ecules into discrete complexes. The resulting coordination polyhedron can be described as a slightly distorted octa-hedron. The discrete complexes are connected through centrosymmetric pairs of (pyridine)C-H⋯N(cyano) hydrogen bonds into chains that are further linked into a three-dimensional network through inter-molecular O-H⋯N hydrogen bonds involving the 4-cyano-pyridine solvent mol-ecules...
April 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28432454/cobalt-tetradehydrocorrins-coordinated-by-imidazolate-like-histidine-in-the-heme-pocket-of-horseradish-peroxidase
#6
Koji Oohora, Ning Tang, Yoshitsugu Morita, Takashi Hayashi
Horseradish peroxidase was reconstituted with cobalt tetradehydrocorrin, rHRP(Co(TDHC)), as a structural analog of cobalamin coordinated with an imidazolate-like His residue, which is generally seen in native enzymes. In contrast to the previously reported cobalt tetradehydrocorrin-reconstituted myoglobin, rMb(Co(TDHC)), the HRP matrix was expected to provide strong axial ligation by His170 which has imidazolate character. rHRP(Co(II)(TDHC)) was characterized by EPR and its reaction with reductants indicates a negative shift of its redox potential compared to rMb(Co(TDHC))...
April 21, 2017: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/28428995/fluorogen-free-aggregation-induced-nir-emission-from-gold-nanoparticles
#7
Meenaxi Saini, Yogeshwar Masirkar, Ritu Varshney, Partha Roy, Kalyan K Sadhu
Controlled diluted aqua regia addition leads to NIR (near infrared) luminescence from aggregated gold nanoparticles at 916 nm. This turn-on luminescence has been observed for gold nanoparticles, regardless of reductants used in their preparation. These aggregated nanoparticles are nontoxic and have been used for bioimaging in human liver carcinoma cells.
April 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28426195/one-step-fabrication-of-non-fluorinated-transparent-super-repellent-surfaces-with-tunable-wettability-functioning-in-both-air-and-oil
#8
Mengying Long, Shan Peng, Xiaojun Yang, Wanshun Deng, Ni Wen, Kai Miao, Gongyun Chen, Xinrui Miao, Wenli Deng
In this paper, we have developed a one-step thermal treatment of polydimethylsiloxane (PDMS) liquid to create transparent super-repellent surface (TSS) and super-repellent powder. They are super-repellent toward water and ethylene glycol. During the one-step thermal treatment, PDMS soot is generated and deposited onto a glass slide (GS) surface to fabricate the TSS without fluorosilane modification. The facilely obtained TSS presented superhydrophobicity and self-cleaning property when immersed into very low surface tension oils such as petroleum ether, hexadecane, peanut oil, and dodecane...
April 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28424101/limited-impacts-of-truck-based-ultra-low-volume-applications-of-mosquito-adulticides-on-mortality-in-honey-bees-apis-mellifera
#9
F D Rinkevich, J W Margotta, V Pokhrel, T W Walker, R H Vaeth, W C Hoffman, B K Fritz, R G Danka, T E Rinderer, R L Aldridge, K J Linthicum, J A Ottea, K B Healy
Adulticides applied against mosquitoes can reduce vector populations during times of high arbovirus transmission. However, impacts of these insecticides on pollinators and other non-target organisms are of concern to mosquito control professionals, beekeepers and others. We evaluated mortality of Culex quinquefasciatus and Apis mellifera when caged insects were exposed to low and high label rates of four common adulticides (Aqua-Pursuit™ [permethrin], Duet® [prallethrin + sumithrin], Fyfanon® [malathion] and Scourge® [resmethrin]) at six distances up to 91...
April 20, 2017: Bulletin of Entomological Research
https://www.readbyqxmd.com/read/28423343/chitosan-as-coagulant-on-cyanobacteria-in-lake-restoration-management-may-cause-rapid-cell-lysis
#10
Maíra Mucci, Natalia Pessoa Noyma, Leonardo de Magalhães, Marcela Miranda, Frank van Oosterhout, Iamê Alves Guedes, Vera L M Huszar, Marcelo Manzi Marinho, Miquel Lürling
Combining coagulant and ballast to remove cyanobacteria from the water column is a promising restoration technique to mitigate cyanobacterial nuisance in surface waters. The organic, biodegradable polymer chitosan has been promoted as a coagulant and is viewed as non-toxic. In this study, we show that chitosan may rapidly compromise membrane integrity and kill certain cyanobacteria leading to release of cell contents in the water. A strain of Cylindrospermopsis raciborskii and one strain of Planktothrix agardhii were most sensitive...
April 10, 2017: Water Research
https://www.readbyqxmd.com/read/28413235/comparison-of-total-and-aqua-regia-extractability-of-heavy-metals-in-sewage-sludge-the-case-study-of-a-certified-reference-material
#11
REVIEW
Anna Santoro, Andrea Held, Thomas P J Linsinger, Andres Perez, Marina Ricci
A number of different digestion methods, including aqua regia extraction following two ISO guides were used in an inter-laboratory comparison study. The results obtained showed comparable values for the total and aqua regia extractable content of As, Cu, Fe, Hg, Pb and Zn, while Cd, Co and Cr results were about 10% lower when aqua regia was employed. This small difference was covered by the between-laboratory relative standard deviation of the measurements; therefore in this study no difference in the extraction of the elements by the employed methods was found...
April 2017: Trends in Analytical Chemistry: TRAC
https://www.readbyqxmd.com/read/28411238/characterization-of-protein-complexes-of-the-endoplasmic-reticulum-associated-degradation-e3-ubiquitin-ligase-hrd1
#12
Jiwon Hwang, Christopher P Walczak, Thomas A Shaler, James A Olzmann, Lichao Zhang, Joshua E Elias, Ron R Kopito
Hrd1 is the core structural component of a large ER membrane-embedded protein complex that coordinates the destruction of folding-defective proteins in the early secretory pathway. Defining the composition, dynamics, and ultimately, the structure of the Hrd1 complex is a crucial step in understanding the molecular basis of glycoprotein quality control, but has been hampered by the lack of suitable techniques to interrogate this complex under native conditions. In this study we used genome editing to generate clonal HEK293 (Hrd1...
April 14, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28409430/spatio-temporal-distribution-of-metals-in-household-dust-from-rural-semi-urban-and-urban-environments-in-the-niger-delta-nigeria
#13
Chukwujindu M A Iwegbue, Ejiro C Oliseyenum, Bice S Martincigh
Concentrations of metals in household dust samples from rural, semi-urban and urban zones of the Niger Delta in Nigeria were measured during both 2009 and 2014 with the aim of providing information on changes in the concentrations, distribution patterns, sources and risks of metals in these zones. The concentrations of metals in the dust samples were quantified by using inductively coupled plasma atomic emission spectrophotometry (ICP-AES) after digestion with aqua regia. The measured concentrations (mg kg(-1)) of metals in the three zones within the study periods were as follows: <LOQ-21...
April 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28398613/intramolecular-hydrogen-bonding-restricts-gd-aqua-ligand-dynamics
#14
Eszter Boros, Raja Srinivas, Hee-Kyung Kim, Arnold M Raitsimring, Andrei V Astashkin, Oleg G Poluektov, Jens Niklas, Andrew D Horning, Bruce Tidor, Peter Caravan
Aqua ligands can undergo rapid internal rotation about the M-O bond. For magnetic resonance contrast agents, this rotation results in diminished relaxivity. Herein, we show that an intramolecular hydrogen bond to the aqua ligand can reduce this internal rotation and increase relaxivity. Molecular modeling was used to design a series of four Gd complexes capable of forming an intramolecular H-bond to the coordinated water ligand, and these complexes had anomalously high relaxivities compared to similar complexes lacking a H-bond acceptor...
April 11, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28392907/protective-effect-of-crocus-sativus-l-saffron-extract-on-spinal-cord-ischemia-reperfusion-injury-in-rats
#15
Gholam Hossein Farjah, Shadi Salehi, Mohammad Hasan Ansari, Bagher Pourheidar
OBJECTIVES: Ischemia/reperfusion (I/R) injury of spinal cord is leading to the paraplegia observed. In this study, we investigated the protective effect of the saffron extract on spinal cord I/R injury. MATERIALS AND METHODS: Thirty five male Sprague-Dawley rats were divided into 5 groups: intact, sham surgery, normal saline (NS), low dose saffron aqua extract, high dose saffron aqua extract. RESULTS: The mean motor deficit index (MDI) scores were significantly lower in the saffron extract groups than in the NS group at 48 hr after spinal cord ischemia (P<0...
March 2017: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/28388318/rotary-and-high-pressure-nozzle-spray-plume-droplet-analysis-for-aerially-applied-mosquito-adulticides-laser-diffraction-characterization
#16
Jonathan A Hornby, Jim Robinson, Milton Sterling
The droplet spectrum of a mosquito adulticide spray plume determines its ability to drift through the target area, impinge on the mosquito, deliver a toxic dose, and the risk of environmental contamination. This paper provides data on droplet spectra produced from 6 nozzles in a high-pressure nozzle spray system and 5 rotary nozzle systems for common mosquito adulticides. Spray plume spectra were measured by laser diffraction. High-pressure nozzles were evaluated at pressures ranging from 500 psi to 6,000 psi...
March 2017: Journal of the American Mosquito Control Association
https://www.readbyqxmd.com/read/28386590/the-actinium-aqua-ion-a-century-in-the-making
#17
Laura M Thierer, Neil C Tomson
No abstract text is available yet for this article.
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28380059/impact-of-the-spatial-resolution-of-satellite-remote-sensing-sensors-in-the-quantification-of-total-suspended-sediment-concentration-a-case-study-in-turbid-waters-of-northern-western-australia
#18
Passang Dorji, Peter Fearns
The impact of anthropogenic activities on coastal waters is a cause of concern because such activities add to the total suspended sediment (TSS) budget of the coastal waters, which have negative impacts on the coastal ecosystem. Satellite remote sensing provides a powerful tool in monitoring TSS concentration at high spatiotemporal resolution, but coastal managers should be mindful that the satellite-derived TSS concentrations are dependent on the satellite sensor's radiometric properties, atmospheric correction approaches, the spatial resolution and the limitations of specific TSS algorithms...
2017: PloS One
https://www.readbyqxmd.com/read/28375608/proton-transfer-driven-water-exchange-mechanism-in-the-na-solvation-shell
#19
Matti Hellström, Jörg Behler
Ligand exchange plays an important role for organic and inorganic chemical reactions. We demonstrate the existence of a novel water exchange mechanism, the "proton transfer pathway" (PTP), around Na(+)(aq) in basic (high pH) solution, using reactive molecular dynamics simulations employing a high-dimensional neural network potential. An aqua ligand in the first solvation (hydration) shell around a sodium ion is only very weakly acidic, but if a hydroxide ion is present in the second solvation shell, thermal fluctuations can cause the aqua ligand to transfer a proton to the neighboring OH(-), resulting in a transient direct-contact ion pair, Na(+)-OH(-), which is only weakly bound and easily dissociates...
April 4, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28366388/removal-of-two-pathogenic-scuticociliates-miamiensis-avidus-and-miamiensis-sp-using-cells-or-culture-filtrates-of-the-dinoflagellate-alexandrium-andersonii
#20
Ji Hye Kim, Hae Jin Jeong, An Suk Lim, Ji Eun Kwon, Kyung Ha Lee, Kwan Ha Park, Hyung Seop Kim
Scuticociliatosis, which is caused by parasitic protistan pathogens known as scuticociliates, is one of the most serious diseases in marine aquaculture worldwide. Thus, elimination of these ciliates is a primary concern for scientists and managers in the aquaculture industry. To date, formalin and other toxic chemicals have been used as anti-scuticociliate agents, but issues regarding their secondary effects often arise. Consequently, development of safer methods is necessary. To find out a safe method of controlling scuticociliate populations in aqua-tanks or small-scale natural environments, cultures of 14 phototrophic dinoflagellates were tested to determine whether they were able to control populations of the common scuticociliates Miamiensis avidus and Miamiensis sp...
March 2017: Harmful Algae
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