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https://www.readbyqxmd.com/read/28318245/dinuclear-rhenium-complex-with-a-proton-responsive-ligand-as-a-redox-catalyst-for-the-electrochemical-co2-reduction
#1
Alexander Wilting, Thorsten Stolper, Ricardo A Mata, Inke Siewert
Herein, we present the reduction chemistry of a dinuclear α-diimine rhenium complex, 1, [Re2(L)(CO)6Cl2], with a proton responsive ligand and its application as a catalyst in the electrochemical CO2 reduction reaction (L = 4-tert-butyl-2,6-bis(6-(1H-imidazol-2-yl)-pyridin-2-yl)phenol). The complex has a phenol group in close proximity to the active center, which may act as a proton relay during catalysis, and pyridine-NH-imidazole units as α-diimine donors. The complex is an active catalyst for the electrochemical CO2 reduction reaction...
March 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28298361/intrarenal-signaling-mediated-by-cck-plays-a-role-in-salt-intake-induced-natriuresis
#2
Hiromi Takahashi-Iwanaga, Shunsuke Kimura, Kohtarou Konno, Masahiko Watanabe, Toshihiko Iwanaga
The natriuretic hormone CCK exhibits its gene transcripts in total kidney extracts. To test the possibility of CCK acting as an intrarenal mediator of sodium excretion, we examined mouse kidneys by: (i) an in situ hybridization technique for CCK mRNA in animals fed a normal or a high-sodium diet; (ii) immuno-electron microscopy for the CCK peptide, (iii) an in situ hybridization method and immunohistochemistry for the CCK-specific receptor CCKAR; (iv) confocal image analysis of receptor-mediated Ca2+ responses in isolated renal tubules; and (v) metabolic cage experiments for the measurement of urinary sodium excretion in high salt-fed mice either treated or untreated with the CCKAR antagonist lorglumide...
March 15, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28298310/atypical-centrioles-are-present-in-tribolium-sperm
#3
E L Fishman, Kyoung Jo, Andrew Ha, Rachel Royfman, Ashtyn Zinn, Malathi Krishnamurthy, Tomer Avidor-Reiss
Typical centrioles are made of microtubules organized in ninefold symmetry. Most animal somatic cells have two centrioles for normal cell division and function. These centrioles originate from the zygote, but because the oocyte does not provide any centrioles, it is surprising that the zygotes of many animals are thought to inherit only one centriole from the sperm. Recently, in the sperm of Drosophila melanogaster, we discovered a second centriolar structure, the proximal centriole-like structure (PCL), which functions in the zygote...
March 2017: Open Biology
https://www.readbyqxmd.com/read/28297270/the-feasibility-of-using-microsoft-kinect-v2-sensors-during-radiotherapy-delivery
#4
David M Edmunds, Sophie E Bashforth, Fatemeh Tahavori, Kevin Wells, Ellen M Donovan
Consumer-grade distance sensors, such as the Microsoft Kinect devices (v1 and v2), have been investigated for use as marker-free motion monitoring systems for radiotherapy. The radiotherapy delivery environment is challenging for such sensors because of the proximity to electromagnetic interference (EMI) from the pulse forming network which fires the magnetron and electron gun of a linear accelerator (linac) during radiation delivery, as well as the requirement to operate them from the control area. This work investigated whether using Kinect v2 sensors as motion monitors was feasible during radiation delivery...
November 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28295735/halogen-bonding-interactions-of-polybrominated-diphenyl-ethers-and-thyroid-hormone-derivatives-a-potential-mechanism-for-inhibition-of-iodothyronine-deiodinase
#5
Eric S Marsan, Craig A Bayse
Polybrominated diphenyl ethers (PBDEs) increase flame resistance in consumer goods, but these compounds and their hydroxylated derivatives (OH-BDEs) impair normal thyroid function. Halogen bonding (XB) of PBDEs to an active site selenocysteine may competitively inhibit iodothyronine deiodinases (Dio) by blocking activation/deactivation of thyroid hormone (TH) derivatives. In this study, we compare the strength of the XB interactions of TH derivatives, iodine-based contrast agents and PBDEs/OH-BDEs to a methylselenolate model of the Dio active site using density functional theory...
March 10, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28291188/quantification-of-peri-implant-bacterial-load-and-in-vivo-biofilm-formation-in-an-innovative-clinically-representative-mouse-model-of-periprosthetic-joint-infection
#6
Alberto V Carli, Samrath Bhimani, Xu Yang, Matthew B Shirley, Karen L de Mesy Bentley, F Patrick Ross, Mathias P G Bostrom
BACKGROUND: Periprosthetic joint infection (PJI) is a devastating complication following total joint arthroplasty. Current animal models of PJI are limited because of a lack of quantitative methods and failure to effectively recreate the periprosthetic space. We therefore developed a murine PJI model involving a 3-dimensionally printed Ti-6Al-4V implant capable of bearing weight and permitting quantitative analysis of periprosthetic bacterial load and evaluation of biofilm. METHODS: Twenty-five 12-week-old C57BL/6 mice received a unilateral proximal tibial implant and intra-articular injection of either 3 × 10 colony forming units (CFUs) of Staphylococcus aureus Xen 36 or saline solution...
March 15, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28285858/high-resolution-profile-of-inorganic-aqueous-geochemistry-and-key-redox-zones-in-an-arsenic-bearing-aquifer-in-cambodia
#7
Laura A Richards, Daniel Magnone, Chansopheaktra Sovann, Chivuth Kong, Sebastian Uhlemann, Oliver Kuras, Bart E van Dongen, Christopher J Ballentine, David A Polya
Arsenic contamination of groundwaters in South and Southeast Asia is a major threat to public health. In order to better understand the geochemical controls on the mobility of arsenic in a heavily arsenic-affected aquifer in northern Kandal Province, Cambodia, key changes in inorganic aqueous geochemistry have been monitored at high vertical and lateral resolution along dominant groundwater flow paths along two distinct transects. The two transects are characterized by differing geochemical, hydrological and lithological conditions...
March 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28279759/what-do-we-know-about-the-structure-of-human-thymic-hassall-s-corpuscles-a-histochemical-immunohistochemical-and-electron-microscopic-study
#8
Renáta Mikušová, Veronika Mešťanová, Štefan Polák, Ivan Varga
Hassall's corpuscles are the most prominent structures in the human thymus. However, relatively few analyses have been performed to determine their function and cellular origins during development. In this study, we evaluated the cellular microenvironment of human thymic Hassall's corpuscles using histochemistry, immunohistochemistry, and transmission electron microscopy. We examined 95 human thymic tissue samples, which were perioperatively obtained from children undergoing cardiac surgery. To characterize the complex cellular microenvironment of human thymic corpuscles, we used a panel of 14 different antibodies to identify discrete cell types...
March 6, 2017: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
https://www.readbyqxmd.com/read/28276300/value-of-renal-biopsy-in-diagnosing-infantile-nephropathic-cystinosis-associated-with-secondary-nephrogenic-diabetes-insipidus
#9
Emily Joyce, Jacqueline Ho, Areeg El-Gharbawy, Cláudia M Salgado, Sarangarajan Ranganathan, Miguel Reyes-Múgica
Cystinosis is the most common cause of inherited renal Fanconi syndrome in young children, and typically presents with laboratory findings of a proximal tubulopathy and corneal crystals by one year of age. We describe here renal biopsy findings in a 20-month-old patient with an atypical presentation of distal renal tubular acidosis, diabetes insipidus, and the absence of corneal crystals. Although renal biopsy is usually not necessary to establish the diagnosis of cystinosis, when the patient presents with atypical signs and symptoms, a renal biopsy may be extremely valuable...
January 2017: Pediatric and Developmental Pathology
https://www.readbyqxmd.com/read/28274946/ontogeny-and-the-process-of-biomineralization-in-the-trichomes-of-loasaceae
#10
Adeel Mustafa, Hans-Jürgen Ensikat, Maximilian Weigend
PREMISE OF THE STUDY: South American Loasaceae have a morphologically complex trichome cover, which is characterized by multiple biomineralization. The current study investigates the ontogeny of these complex trichomes and the process of their biomineralization, since both are very poorly understood. METHODS: The development of stinging trichomes on various parts of the plants and the process of mineralization were studied using scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDX)...
March 8, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28264780/active-and-separate-secretion-of-fiber-and-penton-base-during-the-early-phase-of-ad2-or-ad5-infection
#11
Yuhua Yan, Bo Zhang, Weihong Hou, Hongyu Lin, Johan Rebetz, Saw-See Hong, Youjun Wang, Liang Ran, Xiaolong Fan
Fiber and penton base overproduced in adenovirus (Ad) infected cells can be secreted prior to progeny release and thereby regulate progeny spread. We aimed to investigate the mechanisms of fiber and penton base secretion in Ad2- or Ad5-infected A549 cells. Our flow cytometry analyses detected abundant surface fiber molecules, but little penton base molecules at 12h post infection. Immunogold staining combined with transmission electron microscopic analyses revealed separate, non-co-localized release of fiber and penton base in the proximity of the plasma membrane...
March 3, 2017: Virology
https://www.readbyqxmd.com/read/28261805/structure-and-function-of-complex-i-in-animals-and-plants-a-comparative-view
#12
Jennifer Senkler, Michael Senkler, Hans-Peter Braun
The mitochondrial NADH dehydrogenase complex (complex I) has a molecular mass of about 1000 kDa and includes 40-50 subunits in animals, fungi and plants. It is composed of a membrane arm and a peripheral arm and has a conserved L-like shape in all species investigated. However, in plants and possibly some protists it has a second peripheral domain which is attached to the membrane arm on its matrix exposed side at a central position. The extra domain includes proteins resembling prokaryotic gamma-type carbonic anhydrases...
March 6, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28260179/treatment-of-extra-articular-proximal-and-middle-phalangeal-fractures-of-the-hand-a-systematic-review
#13
REVIEW
D Verver, L Timmermans, R A Klaassen, C H van der Vlies, D I Vos, N W L Schep
The aim of the study was to systematically review the patient reported and functional outcomes of treatment for extra-articular proximal or middle phalangeal fractures of the hand in order to determine the best treatment options. The review methodology was registered with PROSPERO. A systematic literature search was conducted in electronic bibliographic databases. Two independent reviewers performed screening and data extraction. The evaluation of quality of the included studies was performed using the Structured Effectiveness Quality Evaluation scale...
March 4, 2017: Strategies in Trauma and Limb Reconstruction
https://www.readbyqxmd.com/read/28258402/a-software-solution-to-dynamically-reduce-metallic-distortions-of-electromagnetic-tracking-systems-for-image-guided-surgery
#14
Mengfei Li, Christian Hansen, Georg Rose
PURPOSE: Electromagnetic tracking systems (EMTS) have achieved a high level of acceptance in clinical settings, e.g., to support tracking of medical instruments in image-guided interventions. However, tracking errors caused by movable metallic medical instruments and electronic devices are a critical problem which prevents the wider application of EMTS for clinical applications. METHODS: We plan to introduce a method to dynamically reduce tracking errors caused by metallic objects in proximity to the magnetic sensor coil of the EMTS...
March 3, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28255918/morphological-and-molecular-characterization-of-four-sarcocystis-spp-including-sarcocystis-linearis-n-sp-from-roe-deer-capreolus-capreolus-in-italy
#15
Bjørn Gjerde, Stefano Giacomelli, Alessandro Bianchi, Irene Bertoletti, Hajime Mondani, Lucia Rita Gibelli
Fresh (frozen/thawed) muscle samples from four 2-12-year-old roe deer (Capreolus capreolus) from the Sondrio province in north-eastern Italy were examined under a dissecting microscope, and about 180 sarcocysts were isolated and identified to morphological type in wet mounts by light microscopy (LM). Seventy-seven of these sarcocysts were subsequently examined by molecular methods, comprising polymerase chain reaction (PCR) amplification and sequencing of the partial cytochrome c oxidase subunit I gene (cox1) of all isolates, as well as PCR amplification, cloning and sequencing of the complete18S ribosomal RNA (rRNA) gene of two isolates of each species found...
March 2, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28252422/sorption-correction-of-nephron-sub-microscopic-changes-caused-by-neoplastic-chronic-intoxication-with-the-application-of-cytostatic-therapy
#16
Yu Soroka, N Lisnychuk, I Demkiv, O Oleshchuk
The electron microscopic changes of the nephron structural components under conditions of dimethylhydrazine (DMH)-induced carcinogenesis with the development of colorectal adenocarcinoma in situ were evaluated. Destructive changes in epitheliocytes of proximal and distal tubules of the nephron, microcirculation disturbances in renal corpuscles and tubular structure are evidences of disorder in urine formation stages. Аdministration of cytostatics aggravates the degree of destructive changes in the kidney. The application of carbon enterosorbent of IV generation "Carboline" for chronic neoplastic endotoxemia correction in combination with chemotherapy components significantly reduces the structural changes of the cortical substance of the kidneys, activates processes of reparative regeneration...
January 2017: Georgian Medical News
https://www.readbyqxmd.com/read/28252138/stretchable-electronic-skin-based-on-silver-nanowire-composite-fiber-electrodes-for-sensing-pressure-proximity-and-multidirectional-strain
#17
Yin Cheng, Ranran Wang, Haitao Zhai, Jing Sun
Electronic skin (E-skin) has been attracting great research interest and effort due to its potential applications in wearable health monitoring, smart prosthetics, robot skins and so on. To expand its applications, two key challenges lie in the realization of device stretchability, and independent sensing of pressure and multidirectional lateral strain. Here we made a combination of rational device structure and artfully engineered sensing materials to fulfill the mentioned demands. The as-prepared E-skin took a simple orthogonal configuration to enable both capacitive mode for pressure sensing and resistive mode for multidirectional strain sensing, independently...
March 2, 2017: Nanoscale
https://www.readbyqxmd.com/read/28246329/permeation-of-macromolecules-into-the-renal-glomerular-basement-membrane-and-capture-by-the-tubules
#18
Marlon G Lawrence, Michael K Altenburg, Ryan Sanford, Julian D Willett, Benjamin Bleasdale, Byron Ballou, Jennifer Wilder, Feng Li, Jeffrey H Miner, Ulla B Berg, Oliver Smithies
How the kidney prevents urinary excretion of plasma proteins continues to be debated. Here, using unfixed whole-mount mouse kidneys, we show that fluorescent-tagged proteins and neutral dextrans permeate into the glomerular basement membrane (GBM), in general agreement with Ogston's 1958 equation describing how permeation into gels is related to molecular size. Electron-microscopic analyses of kidneys fixed seconds to hours after injecting gold-tagged albumin, negatively charged gold nanoparticles, and stable oligoclusters of gold nanoparticles show that permeation into the lamina densa of the GBM is size-sensitive...
March 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28240885/redox-potential-and-electronic-structure-effects-of-proximal-nonredox-active-cations-in-cobalt-schiff-base-complexes
#19
Alexander H Reath, Joseph W Ziller, Charlene Tsay, Austin J Ryan, Jenny Y Yang
Redox inactive Lewis acidic cations are thought to facilitate the reactivity of metalloenzymes and their synthetic analogues by tuning the redox potential and electronic structure of the redox active site. To explore and quantify this effect, we report the synthesis and characterization of a series of tetradentate Schiff base ligands appended with a crown-like cavity incorporating a series of alkali and alkaline earth Lewis acidic cations (1M, where M = Na(+), K(+), Ca(2+), Sr(2+), and Ba(2+)) and their corresponding Co(II) complexes (2M)...
February 27, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28240857/metal-organic-inorganic-nanocomposite-thermal-interface-materials-with-ultralow-thermal-resistances
#20
Cengiz Yegin, Nirup Nagabandi, Xuhui Feng, Charles King, Massimo Catalano, Jun Kyun Oh, Ansam J Talib, Ethan A Scholar, Stanislav V Verkhoturov, Tahir Cagin, Alexei V Sokolov, Moon J Kim, Kaiser Matin, Sreekant Narumanchi, Mustafa Akbulut
As electronic devices get smaller and more powerful, energy density of energy storage devices increases continuously, and moving components of machinery operate at higher speeds, the need for better thermal management strategies is becoming increasingly important. The removal of heat dissipated during the operation of electronic, electrochemical, and mechanical devices is facilitated by high-performance thermal interface materials (TIMs) which are utilized to couple devices to heat sinks. Herein, we report a new class of TIMs involving the chemical integration of boron nitride nanosheets (BNNS), soft organic linkers, and a copper matrix-which are prepared by the chemisorption-coupled electrodeposition approach...
March 8, 2017: ACS Applied Materials & Interfaces
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