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https://www.readbyqxmd.com/read/28434784/perspectives-on-in-situ-electron-microscopy
#1
Haimei Zheng, Yimei Zhu
In situ transmission electron microscopy (TEM) with the ability to reveal materials dynamic processes with high spatial and temporal resolution has attracted significant interest. The recent advances in in situ methods, including liquid and gas sample environment, pump-probe ultrafast microscopy, nanomechanics and ferroelectric domain switching the aberration corrected electron optics as well as fast electron detector has opened new opportunities to extend the impact of in situ TEM in broad areas of research ranging from materials science to chemistry, physics and biology...
March 29, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28434257/ratio-of-serum-levels-of-ages-to-soluble-rage-is-correlated-with-trimethylamine-n-oxide-in-non-diabetic-subjects
#2
Atsuko Tahara, Nobuhiro Tahara, Sho-Ichi Yamagishi, Akihiro Honda, Sachiyo Igata, Yoshikazu Nitta, Munehisa Bekki, Tomohisa Nakamura, Yoichi Sugiyama, Jiahui Sun, Masayoshi Takeuchi, Makiko Shimizu, Hiroshi Yamazaki, Kei Fukami, Yoshihiro Fukumoto
Trimethylamine (TMA), an intestinal microflora-dependent metabolite formed from phosphatidylcholine- and L-carnitine-rich food, such as red meat, is further converted to trimethylamine-N-oxide (TMAO), which could play a role in cardiometabolic disease. Red meat-derived products are one of the major environmental sources of advanced glycation end products (AGEs) that may also contribute to the pathogenesis of cardiometabolic disorders through the interaction with receptor for AGEs (RAGE). However, the relationship among AGEs, soluble form of RAGE (sRAGE) and TMAO in humans remains unclear...
April 23, 2017: International Journal of Food Sciences and Nutrition
https://www.readbyqxmd.com/read/28431428/computational-and-in-vitro-experimental-investigation-of-intrathecal-drug-distribution-parametric-study-of-the-effect-of-injection-volume-cerebrospinal-fluid-pulsatility-and-drug-uptake
#3
Kevin M Tangen, Roxanne Leval, Ankit I Mehta, Andreas A Linninger
BACKGROUND: Intrathecal drug delivery is an attractive option to circumvent the blood-brain barrier for pain management through its increased efficacy of pain relief, reduction in adverse side effects, and cost-effectiveness. Unfortunately, there are limited guidelines for physicians to choose infusion or drug pump settings to administer therapeutic doses to specific regions of the spine or the brain. Although empiric trialing of intrathecal drugs is critical to determine the sustained side effects, currently there is no inexpensive in vitro method to guide the selection of spinal drug delivery parameters...
May 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28429029/derivatization-and-interlaminar-debonding-of-graphite-iron-nanoparticle-hybrid-interfaces-using-fenton-chemistry
#4
Neha Agarwal, Ruma Bhattacharyya, Narendra K Tripathi, Sanjay Kanojia, Debmalya Roy, Kingsuk Mukhopadhyay, Namburi Eswara Prasad
The interfacial debonding of graphite lattices using iron (Fe) nanoparticles and Fenton's reagent is reported, towards the scalable production of few-layer graphene flakes. Acoustic cavitation via a sonochemical route was adapted to produce iron and iron oxide nanoparticles in the graphite matrix. The oxygenated species were introduced into the graphite lattice using a physical method, and then Fenton chemistry was utilized to generate localized hydroxyl radicals at the Fe nanoparticle-graphite interfaces for zipping and self-exfoliation of the defected graphite lattices...
April 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28427617/effects-of-ultrasound-on-microbial-growth-and-enzyme-activity
#5
REVIEW
Guoping Huang, Suwan Chen, Chunhua Dai, Ling Sun, Wenli Sun, Yingxiu Tang, Feng Xiong, Ronghai He, Haile Ma
Nowadays, ultrasound is widely used in many aspects. In the last few years, many papers have concentrated on the applications of ultrasound in engineering, chemistry, medicine, physics and biology, but few in biological effects such as the acceleration effects on proliferation of microbial cells, the inactivation effects on microorganisms and the influences on the activities of enzyme. Thus, the objective of this review is to investigate the biological effects of ultrasound on these aspects.
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28426053/improved-spatial-resolution-for-spot-sampling-in-thermal-desorption-atomic-force-microscopy-mass-spectrometry-via-rapid-heating-functions
#6
Suhas Somnath, Stephen Jesse, Gary J Van Berkel, Sergei V Kalinin, Olga S Ovchinnikova
The key to advancing materials is to understand and control their structure and chemistry. However, thorough chemical characterization is challenging since existing techniques characterize only a few properties of the specimen, thereby necessitating multiple measurement platforms to acquire the necessary information. The multimodal combination of atomic force microscopy (AFM) and mass spectrometry (MS) transcends existing analytical capabilities for nanometer scale spatially resolved correlation of the chemical and physical properties of a sample surface...
April 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28425543/in-situ-nuclear-magnetic-resonance-microimaging-of-live-biofilms-in-a-microchannel
#7
R S Renslow, M J Marshall, A E Tucker, W B Chrisler, X-Y Yu
Biofilms are comprised of microbial cells and an extracellular polymeric substance (EPS) matrix that supports interactions between community members and with the local environment. The highly hydrated EPS matrix makes the application of many biofilm visualization techniques difficult. Hence, to better visualize how biofilms interact with their environment, there is a need for imaging techniques to monitor hydrated state biofilm dynamics. We employed an in situ dynamic approach to construct label-free images of biofilms...
April 20, 2017: Analyst
https://www.readbyqxmd.com/read/28422350/electronic-g-tensors-in-u-v-complexes-a-computational-study
#8
Helen Moylan, Joseph McDouall
The theory and computation of EPR parameters from first principles has seen a great deal of development over the past two decades. In particular, various techniques for the computation of the electronic g tensor have been implemented in many quantum chemistry packages. These methods have been successfully applied to paramagnetic organic species and transition metal systems. The situation is less well-understood and established in the case of actinide containing molecules and there is a dearth of experimental data available for validation of computations...
April 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28422232/editorial-of-the-pccp-themed-issue-on-physical-chemistry-for-life-sciences
#9
EDITORIAL
Christoph van Wüllen, Kirsten Schwing, Christoph Riehn, Markus Gerhards
No abstract text is available yet for this article.
April 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28420110/chemical-sensors-and-biosensors-in-italy-a-review-of-the-2015-literature
#10
REVIEW
Dario Compagnone, Girolamo Di Francia, Corrado Di Natale, Giovanni Neri, Renato Seeber, Antonella Tajani
The contributions of Italian researchers to sensor research in 2015 is reviewed. The analysis of the activities in one year allows one to obtain a snapshot of the Italian scenario capturing the main directions of the research activities. Furthermore, the distance of more than one year makes meaningful the bibliometric analysis of the reviewed papers. The review shows a research community distributed among different scientific disciplines, from chemistry, physics, engineering, and material science, with a strong interest in collaborative works...
April 14, 2017: Sensors
https://www.readbyqxmd.com/read/28418820/case-241-hemiparkinsonism-hemiatrophy-spect-with-99m-tc-trodat-1-and-muscle-mr-imaging-abnormalities
#11
Thiago Cardoso Vale, Flávia Cristina de Lima Pinto, José Luiz Pedroso, Marília Alves Dos Reis, Ilza Rosa Batista, Rodrigo Affonseca Bressan, René Leandro Magalhães Rivero, Renato Adam Mendonça, Orlando G Barsottini
History A 43-year-old right-handed man presented with a history of progressive mild left-sided weakness and slowness of movements. Symptoms began 4 years earlier, and the patient noticed a progressive decline in his daily routine due to gait difficulties in the past year. There was no history of head trauma, surgery, drug therapy, smoking, or alcohol abuse, nor was there any relevant family history. Examination revealed normal cognition (29 of 30 points on the Mini-Mental State Examination and 27 of 30 points on the Montreal Cognitive Assessment) and normal cerebellar, sensory, cranial nerve, and autonomic function...
May 2017: Radiology
https://www.readbyqxmd.com/read/28417236/basic-sciences-in-ophthalmology-physics-and-chemistry-authors-flammer-josef-mozaffarieh-maneli-bebie-hans-2013-isbn-978-3642-322-600-springer
#12
Shiri Diskin
No abstract text is available yet for this article.
May 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28415861/atmospheric-aerosols-clouds-chemistry-and-climate
#13
V Faye McNeill
Although too small to be seen with the human eye, atmospheric particulate matter has major impacts on the world around us, from our health to global climate. Understanding the sources, properties, and transformations of these particles in the atmosphere is among the major challenges in air quality and climate research today. Significant progress has been made over the past two decades in understanding atmospheric aerosol chemistry and its connections to climate. Advances in technology for characterizing aerosol chemical composition and physical properties have enabled rapid discovery in this area...
April 17, 2017: Annual Review of Chemical and Biomolecular Engineering
https://www.readbyqxmd.com/read/28415427/surface-physical-chemistry-properties-in-coated-bacterial-cellulose-membranes-with-calcium-phosphate
#14
Gabriel Molina de Olyveira, Pierre Basmaji, Ligia Maria Manzine Costa, Márcio Luiz Dos Santos, Carla Dos Santos Riccardi, Fernando Pozzi Semeghini Guastaldi, Raquel Mantuaneli Scarel-Caminaga, Ticiana Sidorenko de Oliveira Capote, Elisabeth Pizoni, Antônio Carlos Guastaldi
Bacterial cellulose has become established as a new biomaterial, and it can be used for medical applications. In addition, it has called attention due to the increasing interest in tissue engineering materials for wound care. In this work, the bacterial cellulose fermentation process was modified by the addition of chondroitin sulfate to the culture medium before the inoculation of the bacteria. The biomimetic process with heterogeneous calcium phosphate precipitation of biological interest was studied for the guided regeneration purposes on bacterial cellulose...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415050/free-radicals-and-polyphenols-the-redox-chemistry-of-neurodegenerative-diseases
#15
REVIEW
Sonia Losada-Barreiro, Carlos Bravo-Díaz
The oxidation of bioorganic materials by air and, particularly, the oxidative stress involved in the cell loss and other pathologies associated with neurodegenerative diseases (NDs) are of enormous social and economic importance. NDs generally involve free radical reactions, beginning with the formation of an initiating radical by some redox, thermal or photochemical process, causing nucleic acid, protein and lipid oxidations and the production of harmful oxidative products. Physically, persons afflicted by NDs suffer progressive loss of memory and thinking ability, mood swings, personality changes, and loss of independence...
March 29, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28406612/sulfonic-groups-originated-dual-functional-interlayer-for-high-performance-lithium-sulfur-battery
#16
Yang Lu, Sui Gu, Jing Guo, Kun Rui, Chunhua Chen, Sanpei Zhang, Jun Jin, Jianhua Yang, Zhaoyin Wen
Lithium sulfur battery is one of the most prospective chemistries in secondary energy storage field due to its high energy density and high theoretical capacity. However, the dissolution of polysulfides in liquid electrolytes causes shuttle effect and the rapid decay of lithium sulfur battery has greatly hindered its practical application. Herein, combination of sulfonated reduced graphene oxide (SRGO) interlayer on the separator is adopted to suppress the shuttle effect. We speculate that this SRGO layer plays as two roles: physically blocking the migration of polysulfide as ion selective layer and anchoring lithium polysulfide by the electronegative sulfonic group...
April 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28406153/regio-and-conformational-isomerization-critical-to-design-of-efficient-thermally-activated-delayed-fluorescence-emitters
#17
Marc K Etherington, Flavio Franchello, Jamie Gibson, Thomas Northey, Jose Santos, Jonathan S Ward, Heather F Higginbotham, Przemyslaw Data, Aleksandra Kurowska, Paloma Lays Dos Santos, David R Graves, Andrei S Batsanov, Fernando B Dias, Martin R Bryce, Thomas J Penfold, Andrew P Monkman
Regio- and conformational isomerization are fundamental in chemistry, with profound effects upon physical properties, however their role in excited state properties is less developed. Here two regioisomers of bis(10H-phenothiazin-10-yl)dibenzo[b,d]thiophene-S,S-dioxide, a donor-acceptor-donor (D-A-D) thermally-activated delayed fluorescence (TADF) emitter, are studied. 2,8-bis(10H-phenothiazin-10-yl)dibenzo[b,d]thiophene-S,S-dioxide exhibits only one quasi-equatorial conformer on both donor sites, with charge-transfer (CT) emission close to the local triplet state leading to efficient TADF via spin-vibronic coupling...
April 13, 2017: Nature Communications
https://www.readbyqxmd.com/read/28405645/a-new-model-of-the-chemistry-of-ionizing-radiation-in-solids-ciris
#18
Christopher N Shingledecker, Romane Le Gal, Eric Herbst
The collisions between high-energy ions and solids can result in significant physical and chemical changes to the material. These effects are potentially important for better understanding the chemistry of interstellar and planetary bodies, which are exposed to cosmic radiation and the solar wind, respectively; however, modeling such collisions on a detailed microscopic basis has thus far been largely unsuccessful. To that end, a new model, entitled CIRIS: the Chemistry of Ionizing Radiation in Solids, was created to calculate the physical and chemical effects of the irradiation of solid materials...
April 13, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28400186/photobiosynthesis-of-stable-and-functional-silver-silver-chloride-nanoparticles-with-hydrolytic-activity-using-hyperthermophilic-%C3%AE-glucosidases-with-industrial-potential
#19
Juscemácia N Araújo, Aryane Tofanello, Viviam M da Silva, Juliana A P Sato, Fabio M Squina, Iseli L Nantes, Wanius Garcia
The β-glucosidases are important enzymes employed in a large number of processes and industrial applications, including biofuel production from biomass. Therefore, in this study, we reported for the first time the photobiosynthesis of stable and functional silver/silver chloride nanoparticles (Ag/AgCl-NPs) using two hyperthermostable bacterial β-glucosidases with industrial potential. The syntheses were straightforward and rapid processes carried out by mixing β-glucosidase and silver nitrate (in buffer 10mM Tris-HCl, pH 8) under irradiation with light (over a wavelength range of 450-600nm), therefore, compatible with the green chemistry procedure...
April 8, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28399656/teaching-old-dyes-new-tricks-biological-probes-built-from-fluoresceins-and-rhodamines
#20
Luke D Lavis
Small-molecule fluorophores, such as fluorescein and rhodamine derivatives, are critical tools in modern biochemical and biological research. The field of chemical dyes is old; colored molecules were first discovered in the 1800s, and the fluorescein and rhodamine scaffolds have been known for over a century. Nevertheless, there has been a renaissance in using these dyes to create tools for biochemistry and biology. The application of modern chemistry, biochemistry, molecular genetics, and optical physics to these old structures enables and drives the development of novel, sophisticated fluorescent dyes...
April 7, 2017: Annual Review of Biochemistry
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