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https://www.readbyqxmd.com/read/29457903/the-excited-state-proton-transfer-in-3-cyano-7-azaindole-from-aqueous-solution-to-ice
#1
Ting-Husn Tu, Yi-Ting Chen, Jiun-Yi Shen, Ta-Chun Lin, Pi-Tai Chou
In this study, we investigated the excited-state proton transfer (ESPT) reaction for 3-cyano-7-azaindole (3CAI) in aqueous solution and in ice. 3CAI undergoes water catalyzed ESPT in the aqueous solution, giving normal (355 nm) and proton transfer tautomer (~472 nm) emission bands. Detailed temperature dependent studies showed that the values of activation free energy (△G≠) were similar between N-H and N-D isotope. Therefore, water catalyzed ESPT involves a stepwise mechanism incorporating solvation equilibrium (Keq) to form a 1:1 (molar ratio) water: 3CAI cyclic hydrogen bonded complex as an intermediate, followed by perhaps proton tunneling reaction...
February 19, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29457438/-ct-and-mri-manifestation-of-primary-spinal-large-b-cell-lymphoma
#2
Ping Tian, Kai Jiang, Zhi-Qiang Cai, Yong-Tao Wang, Sheng-de Deng
OBJECTIVE: To investigate CT and MRI characteristics of primary spinal large B cell lymphoma. METHODS: CT and MRI data of 23 patients with primary spinal large B cell lymphoma confirmed by histopathology were retrospectively analyzed from March 2011 to August 2015. Among them, including 14 males and 9 females aged from 28 to 70 years old with an average of 53.4 years old. The clinical manifestation mainly focus on pain around spinal and minority peripheral nerve symptom...
December 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29456763/causal-effect-of-smoking-on-dna-methylation-in-peripheral-blood-a-twin-and-family-study
#3
Shuai Li, Ee Ming Wong, Minh Bui, Tuong L Nguyen, Ji-Hoon Eric Joo, Jennifer Stone, Gillian S Dite, Graham G Giles, Richard Saffery, Melissa C Southey, John L Hopper
Background: Smoking has been reported to be associated with peripheral blood DNA methylation, but the causal aspects of the association have rarely been investigated. We aimed to investigate the association and underlying causation between smoking and blood methylation. Methods: The methylation profile of DNA from the peripheral blood, collected as dried blood spots stored on Guthrie cards, was measured for 479 Australian women including 66 monozygotic twin pairs, 66 dizygotic twin pairs, and 215 sisters of twins from 130 twin families using the Infinium HumanMethylation450K BeadChip array...
2018: Clinical Epigenetics
https://www.readbyqxmd.com/read/29455971/chitosan-based-ion-imprinted-cryo-composites-with-excellent-selectivity-for-copper-ions
#4
Maria Valentina Dinu, Ionel Adrian Dinu, Maria Marinela Lazar, Ecaterina Stela Dragan
An original strategy is proposed here to design chitosan-based ion-imprinted cryo-composites (II-CCs) with pre-organized recognition sites and tailored porous structure by combining ion-imprinting and ice-templating techniques. The cryo-composites showed a tube-like porous morphology with interconnected parallel micro-channels, the distance between the channel walls being around 15 μm. Both the entrapment of a natural zeolite and the presence of carboxylate groups, generated by partial hydrolysis of amide moieties, led to II-CCs with controlled swelling ratios (25-40 g/g, depending on pH) and enhanced overall chelating efficiency (260 mg Cu2+ /g composite)...
April 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29455285/characterization-of-a-novel-miniaturized-burst-mode-infrared-laser-system-for-ir-maldesi-mass-spectrometry-imaging
#5
Måns Ekelöf, Jeffrey Manni, Milad Nazari, Mark Bokhart, David C Muddiman
Laser systems are widely used in mass spectrometry as sample probes and ionization sources. Mid-infrared lasers are particularly suitable for analysis of high water content samples such as animal and plant tissues, using water as a resonantly excited sacrificial matrix. Commercially available mid-IR lasers have historically been bulky and expensive due to cooling requirements. This work presents a novel air-cooled miniature mid-IR laser with adjustable burst-mode output and details an evaluation of its performance for mass spectrometry imaging...
February 17, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29455125/trends-in-analytical-techniques-applied-to-particulate-matter-characterization-a-critical-review-of-fundaments-and-applications
#6
REVIEW
Elson Silva Galvão, Jane Meri Santos, Ana Teresa Lima, Neyval Costa Reis, Marcos Tadeu D'Azeredo Orlando, Richard Michael Stuetz
Epidemiological studies have shown the association of airborne particulate matter (PM) size and chemical composition with health problems affecting the cardiorespiratory and central nervous systems. PM also act as cloud condensation nuclei (CNN) or ice nuclei (IN), taking part in the clouds formation process, and therefore can impact the climate. There are several works using different analytical techniques in PM chemical and physical characterization to supply information to source apportionment models that help environmental agencies to assess damages accountability...
February 12, 2018: Chemosphere
https://www.readbyqxmd.com/read/29454466/-dermoid-cysts-of-the-posterior-cerebral-fossa-in-children-revealed-by-recurrent-aseptic-meningitis-report-of-two-cases-and-a-review-of-the-literature
#7
R Kouadria, M Derkaoui
INTRODUCTION: Dermoid cysts of central nervous system are very rare. The usual clinical presentation is dominated by intracranial hypertension, epilepsy and cranial palsy. The revelation mode could be recurrent aseptic meningitis. AIM: The aim of this case report is to consider the dermoid cyst as regards the differential diagnosis in children treated for recurrent aseptic meningitis to avoid misdiagnosis and ice qui a orienté le diagnostic à une méningitnadequate treatment...
February 14, 2018: Neuro-Chirurgie
https://www.readbyqxmd.com/read/29454297/intracytoplasmic-sperm-injection-icsi-of-in-vitro-matured-oocytes-with-stored-epididymal-spermatozoa-in-camel-camelus-dromedarius-effect-of-exogenous-activation-on-in-vitro-embryo-development
#8
Nisar A Wani, Seungbum Hong
Experiments were conducted to investigate the development of in vitro matured camel oocytes after their intra-cytoplasmic sperm injection (ICSI) with epididymal sperm collected from slaughtered male camels. Ovaries and testes were collected from a local slaughterhouse in normal saline solution (NSS) at 37 °C and on ice (0-1 °C), respectively. Cumulus-oocyte complexes (COCs) aspirated from the follicles were randomly distributed to 4-well culture plates (20-25 COCs/well) containing 500 μL of maturation medium and cultured at 38...
February 8, 2018: Theriogenology
https://www.readbyqxmd.com/read/29453579/cryopreservation-of-human-testicular-tissue-by-isopropyl-controlled-slow-freezing
#9
Yoni Baert, Jaime Onofre, Dorien Van Saen, Ellen Goossens
Tissue cryopreservation uses very low temperatures to preserve structurally intact living cells in their natural microenvironment. Cell survival is strongly influenced by the biophysical effects of ice during both the freezing and the subsequent thawing. These effects can be controlled by optimizing the fragment size, type of cryoprotectant, and cooling rate. The challenge is to determine cryopreservation parameters that suit all cell types present in the tissue. Here we describe a quick and convenient protocol for the cryopreservation of testicular tissue using an isopropyl-insulated freezing device, which was validated in both a mouse and a human model...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29453356/coastal-polynyas-winter-oases-for-subadult-southern-elephant-seals-in-east-antarctica
#10
Sara Labrousse, Guy Williams, Takeshi Tamura, Sophie Bestley, Jean-Baptiste Sallée, Alexander D Fraser, Michael Sumner, Fabien Roquet, Karine Heerah, Baptiste Picard, Christophe Guinet, Robert Harcourt, Clive McMahon, Mark A Hindell, Jean-Benoit Charrassin
Antarctic coastal polynyas are regions of persistent open water and are thought to be key bio-physical features within the sea-ice zone. However, their use by the upper trophic levels of ecosystems remains unclear. A unique bio-physical dataset recorded by southern elephant seals reveals that East Antarctic polynyas are a key winter foraging habitat for male seals. During their post-moult trips from Isles Kerguelen to the Antarctic continental shelf, a total of 18 out of 23 seals visited 9 different polynyas, spending on average 25 ± 20% (up to 75%) of their total trip time inside polynyas...
February 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29453254/development-of-a-versatile-cas9-driven-subpopulation-selection-toolbox-in-lactococcus-lactis
#11
Simon van der Els, Jennelle K James, Michiel Kleerebezem, Peter A Bron
CRISPR-Cas9 technology has been exploited for the removal or replacement of genetic elements in a wide range of prokaryotes and eukaryotes. Here we describe the extension of the Cas9 application toolbox to the industrially important dairy species Lactococcus lactis The Cas9 expression vector pLABTarget was constructed, encoding the Streptocccus pyogenes Cas9 under control of a constitutive promoter, and allowing plug and play introduction of sgRNA sequences to target specific genetic loci. Introduction of a pepN -targeting derivative of pLABTarget into L...
February 16, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29453119/an-analysis-of-environmental-incidents-for-a-national-antarctic-program
#12
Shaun T Brooks, Julia Jabour, Andy J Sharman, Dana M Bergstrom
Research stations in Antarctica are concentrated on scarce ice-free habitats. Operating these stations in the harsh Antarctic climate provides many challenges, including the need to handle bulk fuel and cargo increasing the risk of environmental incidents. We examined 195 reports of environmental incidents from the Australian Antarctic Program, spanning six years, to investigate the impacts and pathways of contemporary environmental incidents. Fuel and chemical spills were most common, followed by biosecurity incursions...
February 13, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29452078/ice-free-cryopreservation-of-heart-valve-tissue-the-effect-of-adding-mitoq-to-a-vs83-formulation-and-its-influence-on-mitochondrial-dynamics
#13
Yulong Sui, Qing Fan, Bin Wang, Jixian Wang, Qing Chang
No abstract text is available yet for this article.
February 13, 2018: Cryobiology
https://www.readbyqxmd.com/read/29451398/examining-heat-treatment-for-stabilization-of-the-lipidome
#14
Jeremy P Koelmel, Christina M Jones, Candice Z Ulmer, Timothy J Garrett, Richard A Yost, Tracey B Schock, John A Bowden
AIM: To confidently determine lipid-based biomarkers, it is important to minimize variation introduced during preanalytical steps. We evaluated reducing variation associated with lipid measurements in invertebrate sentinel species using a state-of-the-art heat treatment technique. MATERIALS AND METHODS: Earthworms (Eisenia fetida), house crickets (Acheta domestica) and ghost shrimp (Palaemonetes paludosus) were euthanized either by flash freezing or heat treatment...
February 16, 2018: Bioanalysis
https://www.readbyqxmd.com/read/29451134/a-new-route-to-gold-nanoflowers
#15
Ferenc Liebig, Ricky Henning, Radwan Sarhan, Claudia Prietzel, Matias Bargheer, Joachim Koetz
Catanionic vesicles spontaneously formed by mixing the anionic surfactant AOT with the cationic surfactant CTAB were used as a reducing medium to produce gold clusters, which are embedded well ordered into the template phase. The gold clusters can be used as seeds in the following growth process by adding ascorbic acid as a mild reducing component. When the ascorbic acid is added very slowly in an ice bath round-edged gold nanoflowers were produced. When the same experiments were performed at room temperature in presence of Ag+ ions sharp-edged nanoflowers can be synthesized...
February 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29450933/face-cooling-reveals-a-relative-inability-to-increase-cardiac-parasympathetic-activation-during-passive-heat-stress
#16
Zachary J Schlader, Morgan C O'Leary, James R Sackett, Blair D Johnson
We tested the hypothesis that passive heat stress attenuates the increase in cardiac parasympathetic stimulation, vascular resistance, and blood pressure evoked by face cooling. During normothermia and when intestinal temperature was elevated by 1.0 ± 0.2°C, eleven healthy young adults underwent 3 min of face cooling. Face cooling was accomplished by placing a 2.5 L bag of ice water (0 ± 0°C) over the cheeks, eyes, and forehead. Primary variables included forehead skin temperature, mean arterial pressure, and systemic, forearm and cutaneous vascular resistances...
February 15, 2018: Experimental Physiology
https://www.readbyqxmd.com/read/29449784/immaterial-and-monetary-gifts-in-economic-transactions-evidence-from-the-field
#17
Michael Kirchler, Stefan Palan
Reciprocation of monetary gifts is well-understood in economics. In contrast, there is little research on reciprocal behavior following immaterial gifts like compliments. We narrow this gap and investigate how employees reciprocate after receiving immaterial gifts and material gifts over time. We purchase (1) ice cream from fast food restaurants, and (2) durum doner, a common lunch snack, from independent vendors. Prior to the food's preparation, we either compliment or tip the salesperson. We find that salespersons reciprocate compliments with higher product weight than in a control treatment...
2018: Experimental Economics
https://www.readbyqxmd.com/read/29448822/ice-liquid-isotope-fractionation-factors-for-18-o-and-2-h-deduced-from-the-isotopic-correction-constants-for-the-triple-point-of-water
#18
Xing Wang, Harro A J Meijer
The stable isotopes of water are extensively used as tracers in many fields of research. For this use, it is essential to know the isotope fractionation factors connected to various processes, the most important of which being phase changes. Many experimental studies have been performed on phase change fractionation over the last decades. Whereas liquid-vapour fractionation measurements are relatively straightforward, vapour-solid and liquid-solid fractionation measurements are more complicated, as maintaining equilibrium conditions when a solid is involved is difficult...
February 15, 2018: Isotopes in Environmental and Health Studies
https://www.readbyqxmd.com/read/29448394/attenuation-of-slow-10-40-ev-electrons-in-soft-nanoparticles-size-matters-in-argon-clusters
#19
Mathias Winkler, Knut J Børve
Electron attenuation due to inelastic and elastic scattering in condensed media can often be described in terms of the effective attenuation length (EAL) of the electron. The EAL is thus an important parameter for describing electron transport processes as exemplified by dissipation of energy following radiolysis. Focusing on electrons at low electron kinetic energies (10-40 eV) in condensed argon, we determine EAL from x-ray photoelectron spectra of argon nanoparticles and compare to values obtained from valence ionization in thin argon films as well as from gas-phase electron-scattering data...
January 2018: Physical Review. E
https://www.readbyqxmd.com/read/29448233/earth-s-field-nmr-detection-of-oil-under-arctic-ice-water-suppression
#20
Mark S Conradi, Stephen A Altobelli, Nicholas J Sowko, Susan H Conradi, Eiichi Fukushima
Earth's field NMR has been developed to detect oil trapped under or in Arctic sea-ice. A large challenge, addressed here, is the suppression of the water signal that dominates the oil signal. Selective suppression of water is based on relaxation time T 1 because of the negligible chemical shifts in the weak earth's magnetic field, making all proton signals overlap spectroscopically. The first approach is inversion-null recovery, modified for use with pre-polarization. The requirements for efficient inversion over a wide range of B 1 and subsequent adiabatic reorientation of the magnetization to align with the static field are stressed...
February 7, 2018: Journal of Magnetic Resonance
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