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https://www.readbyqxmd.com/read/28100119/distribution-of-saccharides-and-salts-on-amphoteric-ion-exchange-resin
#1
Yuki Sha, Ayako Hasegawa, Utano Aimoto, Shuji Adachi
An amphoteric ion-exchange resin hardly shrank in 550 and 300 g/L glucose and sodium chloride solutions, respectively; however, the bed packed with a cation-exchange resin shrank considerably. From the distribution coefficients of some saccharides, the swelling pressure of the amphoteric ion-exchange resin was estimated to be 2.0 MPa at 25 °C. The distribution coefficients of glucose, galactose, fructose, and mannose were independent of their concentration and were about 0.621. On the other hand, the apparent distribution coefficients of NaF, NaCl, NaBr, NaI, LiCl, KCl, and CsCl largely depended on concentration...
January 19, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28098824/fabrication-of-a-miniature-multi-parameter-sensor-chip-for-water-quality-assessment
#2
Bo Zhou, Chao Bian, Jianhua Tong, Shanhong Xia
Water contamination is a main inducement of human diseases. It is an important step to monitor the water quality in the water distribution system. Due to the features of large size, high cost, and complicated structure of traditional water determination sensors and devices, it is difficult to realize real-time water monitoring on a large scale. In this paper, we present a multi-parameter sensor chip, which is miniature, low-cost, and robust, to detect the pH, conductivity, and temperature of water simultaneously...
January 14, 2017: Sensors
https://www.readbyqxmd.com/read/28098409/trpv4-contributes-to-resting-membrane-potential-in-retinal-m%C3%A3-ller-cells-implications-in-cell-volume-regulation
#3
Vanina Netti, Juan Fernández, Maia Kalstein, Alejandro Pizzoni, Gisela Di Giusto, Valeria Rivarola, Paula Ford, Claudia Capurro
Neural activity alters osmotic gradients favoring cell swelling in retinal Müller cells. This swelling is followed by a regulatory volume decrease (RVD), partially mediated by an efflux of KCl and water. The transient receptor potential channel 4 (TRPV4), a nonselective calcium channel, has been proposed as a candidate for mediating intracellular Ca(2+) elevation induced by swelling. We previously demonstrated in a human Müller cell line (MIO-M1) that RVD strongly depends on ion channel activation and, consequently, on membrane potential (Vm )...
January 18, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28097042/the-relaxant-activity-of-safranal-in-isolated-rat-aortas-is-mediated-predominantly-via-an-endothelium-independent-mechanism-vasodilatory-mechanism-of-safranal
#4
Bibi Marjan Razavi, Mojtaba Alipoor Amanloo, Mohsen Imenshahidi, Hossein Hosseinzadeh
OBJECTIVES: Safranal is a pharmacologically active component of saffron and is responsible for the unique aroma of saffron. The hypotensive effect of safranal has been shown in previous studies. This study evaluates the mechanism for the vasodilatory effects induced by safranal on isolated rat aortas. METHODS: To study the vasodilatory effects of safranal (0.2, 0.4 and 0.8 mM), we contracted isolated rat thoracic aorta rings by using 10(-6)-M phenylephrine (PE) or 80-mM KCl...
December 2016: Journal of Pharmacopuncture
https://www.readbyqxmd.com/read/28089870/large-dense-core-vesicle-exocytosis-from-mouse-dorsal-root-ganglion-neurons-is-regulated-by-neuropeptide-y
#5
Anneka Bost, Ali H Shaib, Yvonne Schwarz, Barbara A Niemeyer, Ute Becherer
Peptidergic dorsal root ganglion (DRG) neurons transmit sensory and nociceptive information from the periphery to the central nervous system. Their synaptic activity is profoundly affected by neuromodulatory peptides stored and released from large dense-core vesicles (LDCVs). However, the mechanism of peptide secretion from DRG neurons is poorly understood. Using total internal reflection fluorescence microscopy (TIRFM), we visualized individual LDCVs loaded with fluorescent neuropeptide Y (NPY) and analyzed their stimulation-dependent release...
January 12, 2017: Neuroscience
https://www.readbyqxmd.com/read/28075127/homeomorphic-isomerization-as-a-design-element-in-con-tainer-molecules-binding-displacement-and-selective-transport-of-mcl2-species-m-pt-pd-ni
#6
Sugam Kharel, Hemant Joshi, Stephen Bierschenk, Michael Stollenz, Deeb Taher, Nattamai Bhuvanesh, John A Gladysz
The dibridgehead diphosphine P((CH2)14)3P (1) can rapidly turn itself inside-out (homeomorphic isomerization) to give a mixture of in,in and out,out isomers. The exo directed lone pairs in the latter are able to scavenge Lewis acidic MCl2; cage like adducts of the in,in isomer, trans-MCl2(P((CH2)14)3P) (M = 2/Pt, 3/Pd, 4/Ni), then form. The NiCl2 unit in 4 (which is crystallographically characterized) may be replaced by PtCl2 or PdCl2, but 2 and 3 do not give similar substitutions. U-tubes are charged with CH2Cl2 solutions of 1 (lower phase), an aqueous solution of K2MCl4 (charging arm; M = Pt, Pd), and an aqueous solution of excess KCl (receiving arm)...
January 11, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28069125/limonene-encapsulation-in-freeze-dried-gellan-systems
#7
Vasiliki Evageliou, Dimitra Saliari
The encapsulation of limonene in freeze-dried gellan systems was investigated. Surface and encapsulated limonene content was determined by measurement of the absorbance at 252nm. Gellan matrices were both gels and solutions. For a standard gellan concentration (0.5wt%) gelation was induced by potassium or calcium chloride. Furthermore, gellan solutions of varying concentrations (0.25-1wt%) were also studied. Limonene was added at two different concentrations (1 and 2mL/100g sample). Gellan gels encapsulated greater amounts of limonene than solutions...
May 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28054659/hardness-of-cubic-solid-solutions
#8
Faming Gao
We demonstrate that a hardening rule exists in cubic solid solutions with various combinations of ionic, covalent and metallic bonding. It is revealed that the hardening stress ∆τFcg is determined by three factors: shear modulus G, the volume fraction of solute atoms fv, and the size misfit degree δb. A simple hardening correlation in KCl-KBr solid-solution is proposed as ∆τFcg = 0.27 G. It is applied to calculate the hardening behavior of the Ag-Au, KCl-KBr, InP-GaP, TiN-TiC, HfN-HfC, TiC-NbC and ZrC-NbC solid-solution systems...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28054477/acute-treatment-with-lauric-acid-reduces-blood-pressure-and-oxidative-stress-in-spontaneously-hypertensive-rats
#9
Naiane Ferraz Bandeira Alves, Thyago Moreira de Queiroz, Rafael de Almeida Travassos, Marciane Magnani, Valdir de Andrade Braga
The effects of acute administration of lauric acid (LA), the most abundant medium-chain fatty acid of coconut oil, on blood pressure, heart rate and oxidative stress were investigated in spontaneously hypertensive rats (SHR). Intravenous doses of LA reduced blood pressure in a dose-dependent fashion (1, 3, 4, 8 and 10 mg/kg) in both SHR and Wistar Kyoto rats. LA (10(-8) to 3 × 10(-3) M) induced vasorelaxation in isolated superior mesenteric artery rings of SHR in the presence (n = 7) or absence (n = 8) of functional endothelium [maximum effect (ME) = 104 ± 3 versus 103 ± 4%]...
November 7, 2016: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28053504/nitroglycerin-enhances-the-propagation-of-cortical-spreading-depression-comparative-studies-with-sumatriptan-and-novel-kynurenic-acid-analogues
#10
Levente Knapp, Bence Szita, Kitti Kocsis, László Vécsei, József Toldi
BACKGROUND: The complex pathophysiology of migraine is not yet clearly understood; therefore, experimental models are essential for the investigation of the processes related to migraine headache, which include cortical spreading depression (CSD) and NO donor-induced neurovascular changes. Data on the assessment of drug efficacy in these models are often limited, which prompted us to investigate a novel combined migraine model in which an effective pharmacon could be more easily identified...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28045530/dynamic-fluctuation-of-u-3-coordination-structure-in-the-molten-licl-kcl-eutectic-via-first-principles-molecular-dynamics-simulations
#11
Xuejiao Li, Jia Song, Shuping Shi, Liuming Yan, Zhaochun Zhang, Tao Jiang, Shuming Peng
The dynamic fluctuation of the U(3+) coordination structure in a molten LiCl-KCl mixture was studied using first principles molecular dynamics (FPMD) simulations. The radial distribution function, probability distribution of coordination numbers, fluctuation of coordination number and cage volume, self-diffusion coefficient and solvodynamic mean radius of U(3+), dynamics of the nearest U-Cl distances, and van Hove function were evaluated. It was revealed that fast exchange of Cl(-) occurred between the first and second coordination shells of U(3+) accompanied with fast fluctuation of coordination number and rearrangement of coordination structure...
January 17, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28041737/potassium-carbonate-as-a-cation-source-for-early-lactation-dairy-cows-fed-high-concentrate-diets
#12
A R Alfonso-Avila, É Charbonneau, P Y Chouinard, G F Tremblay, R Gervais
Previous studies reported that addition of K2CO3 to high-concentrate diets improved milk fat synthesis, although the mechanism is yet to be established. The objective of the current experiment was to investigate the effects of dietary cation-anion difference (DCAD), cation source, and buffering ability of the mineral supplement on rumen biohydrogenation of fatty acids and production performance in dairy cows fed a high-concentrate diet. Thirty-five early-lactation Holstein cows (25 multiparous ruminally fistulated and 10 primiparous nonfistulated) were used in a randomized complete block design (7 blocks) with 33-d periods, including a 5-d pre-treatment collection period used as a covariate...
December 29, 2016: Journal of Dairy Science
https://www.readbyqxmd.com/read/28040175/impact-of-nacl-reduction-on-lactic-acid-bacteria-during-fermentation-of-nocellara-del-belice-table-olives
#13
Paola Zinno, Barbara Guantario, Giuditta Perozzi, Gianni Pastore, Chiara Devirgiliis
Table olives are widely consumed worldwide but, due to the presence of NaCl in fermenting brines, they contain high levels of sodium. A promising strategy to lower sodium content is the reduction or substitution of NaCl in brines with other chlorides. However, these procedures may impact safety, spoilage, as well as quality and technological properties, including the evolution and final composition of the fermenting microbiota. In the present work the effects of partially replacing NaCl with KCl in fermenting brines on the microbiological quality of Nocellara del Belice olives produced by Spanish style (Sivigliano) or Castelvetrano methods have been analyzed...
May 2017: Food Microbiology
https://www.readbyqxmd.com/read/28030573/cation-stress-responsive-transcription-factors-slta-and-crza-regulate-morphogenetic-processes-and-pathogenicity-of-colletotrichum-gloeosporioides
#14
Amit K Dubey, Shiri Barad, Neta Luria, Dilip Kumar, Eduardo A Espeso, Dov B Prusky
Growth of Colletotrichum gloeosporioides in the presence of cation salts NaCl and KCl inhibited fungal growth and anthracnose symptom of colonization. Previous reports indicate that adaptation of Aspergillus nidulans to salt- and osmotic-stress conditions revealed the role of zinc-finger transcription factors SltA and CrzA in cation homeostasis. Homologs of A. nidulans SltA and CrzA were identified in C. gloeosporioides. The C. gloeosporioides CrzA homolog is a 682-amino acid protein, which contains a C2H2 zinc finger DNA-binding domain that is highly conserved among CrzA proteins from yeast and filamentous fungi...
2016: PloS One
https://www.readbyqxmd.com/read/28028144/valproate-reduces-delayed-brain-injury-in-a-rat-model-of-subarachnoid-hemorrhage
#15
Arend M Hamming, Annette van der Toorn, Umesh S Rudrapatna, Lisha Ma, Hine J A van Os, Michel D Ferrari, Arn M J M van den Maagdenberg, Erik van Zwet, Katherine Poinsatte, Ann M Stowe, Rick M Dijkhuizen, Marieke J H Wermer
BACKGROUND AND PURPOSE: Spreading depolarizations (SDs) may contribute to delayed cerebral ischemia after subarachnoid hemorrhage (SAH). We tested whether SD-inhibitor valproate reduces brain injury in an SAH rat model with and without experimental SD induction. METHODS: Rats were randomized in a 2×2 design and pretreated with valproate (200 mg/kg) or vehicle for 4 weeks. SAH was induced by endovascular puncture of the right internal carotid bifurcation. One day post-SAH, brain tissue damage was measured with T2-weighted magnetic resonance imaging, followed by cortical application of 1 mol/L KCl (to induce SDs) or NaCl (no SDs)...
December 27, 2016: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28025527/purification-and-characterization-of-a-new-alginate-lyase-from-marine-bacterium-vibrio-sp-sy08
#16
Shangyong Li, Linna Wang, Jianhua Hao, Mengxin Xing, Jingjing Sun, Mi Sun
Unsaturated alginate disaccharides (UADs), enzymatically derived from the degradation of alginate polymers, are considered powerful antioxidants. In this study, a new high UAD-producing alginate lyase, AlySY08, has been purified from the marine bacterium Vibrio sp. SY08. AlySY08, with a molecular weight of about 33 kDa and a specific activity of 1070.2 U/mg, showed the highest activity at 40 °C in phosphate buffer at pH 7.6. The enzyme was stable over a broad pH range (6.0-9.0) and retained about 75% activity after incubation at 40 °C for 2 h...
December 23, 2016: Marine Drugs
https://www.readbyqxmd.com/read/28025082/identification-of-g-quadruplex-dna-rna-binders-structure-based-virtual-screening-and-biophysical-characterization
#17
Roberta Rocca, Federica Moraca, Giosuè Costa, Matteo Nadai, Matteo Scalabrin, Carmine Talarico, Simona Distinto, Elias Maccioni, Francesco Ortuso, Anna Artese, Stefano Alcaro, Sara N Richter
BACKGROUND: Recent findings demonstrated that, in mammalian cells, telomere DNA (Tel) is transcribed into telomeric repeat-containing RNA (TERRA), which is involved in fundamental biological processes, thus representing a promising anticancer target. For this reason, the discovery of dual (as well as selective) Tel/TERRA G-quadruplex (G4) binders could represent an innovative strategy to enhance telomerase inhibition. METHODS: Initially, docking simulations of known Tel and TERRA active ligands were performed on the 3D coordinates of bimolecular G4 Tel DNA (Tel2) and TERRA (TERRA2)...
December 23, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28024085/on-the-functional-role-of-valve-interstitial-cell-stress-fibers-a-continuum-modeling-approach
#18
Yusuke Sakamoto, Rachel M Buchanan, Johannah Sanchez-Adams, Farshid Guilak, Michael S Sacks
The function of the heart valve interstitial cells (VICs) is intimately connected to heart valve tissue remodeling and repair, as well as the onset and progression of valvular pathological processes. There is yet only very limited knowledge and extant models for the complex three-dimensional VIC internal stress-bearing structures, the associated cell-level biomechanical behaviors, and how they change under varying activation levels. Importantly, VICs are known to exist and function within the highly dynamic valve tissue environment, including very high physiological loading rates...
February 1, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28017995/effect-of-partial-substitution-of-nacl-by-kcl-on-physicochemical-properties-biogenic-amines-and-n-nitrosamines-during-ripening-and-storage-of-dry-cured-bacon
#19
Feng Li, Hong Zhuang, Weiwei Qiao, Jianhao Zhang, Yongli Wang
Effects of three salting treatments (Formulation II: 80 % NaCl + 20 % KCl; Formulation III: 60 % NaCl + 40 % KCl and Formulation IV: 40 % NaCl + 60 % KCl) on physicochemical properties, residual nitrite, N-nitrosamines and biogenic amines were compared with those of control bacons (Formulation I: 100 % NaCl) during processing and storage. Results showed that there were no significant differences among treatments for moisture, pH, and total volatile basic nitrogen (TVBN) content in dry-cured bacons during processing...
October 2016: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28017365/acclimation-to-salt-modifies-the-activation-of-several-osmotic-stress-activated-lipid-signalling-pathways-in-chlamydomonas
#20
Harold J G Meijer, John A J van Himbergen, Alan Musgrave, Teun Munnik
Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated...
December 22, 2016: Phytochemistry
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