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acid base strong ion

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https://www.readbyqxmd.com/read/28925704/ict-isomerization-induced-turn-on-fluorescence-probe-with-a-large-emission-shift-for-mercury-ion-application-in-combinational-molecular-logic
#1
Sushil Ranjan Bhatta, Bijan Mondal, Gonela Vijaykumar, Arunabha Thakur
A unique turn-on fluorescent device based on a ferrocene-aminonaphtholate derivative specific for Hg(2+) cation was developed. Upon binding with Hg(2+) ion, the probe shows a dramatic fluorescence enhancement (the fluorescence quantum yield increases 58-fold) along with a large red shift of 68 nm in the emission spectrum. The fluorescence enhancement with a red shift may be ascribed to the combinational effect of C═N isomerization and an extended intramolecular charge transfer (ICT) mechanism. The response was instantaneous with a detection limit of 2...
September 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28921378/chemistry-and-chemical-equilibrium-dynamics-of-bmaa-and-its-carbamate-adducts
#2
Pedro Diaz-Parga, Joy J Goto, V V Krishnan
Beta-N-methylamino-L-alanine (BMAA) has been demonstrated to contribute to the onset of the ALS/Parkinsonism-dementia complex (ALS/PDC) and is implicated in the progression of other neurodegenerative diseases. While the role of BMAA in these diseases is still debated, one of the suggested mechanisms involves the activation of excitatory glutamate receptors. In particular, the excitatory effects of BMAA are shown to be dependent on the presence of bicarbonate ions, which in turn forms carbamate adducts in physiological conditions...
September 18, 2017: Neurotoxicity Research
https://www.readbyqxmd.com/read/28917808/single-drop-gold-nanoparticles-for-headspace-microextraction-and-colorimetric-assay-of-mercury-ii-in-environmental-waters
#3
Tesfaye Tolessa, Zhi-Qiang Tan, Yong-Guang Yin, Jing-Fu Liu
A novel headspace colorimetric nanosensor strategy for specific detection of Hg(II) was developed based upon analyte induced etching and amalgamation of gold nanoparticles (AuNPs). The Hg(II) was first selectively reduced to its volatile form, Hg(0), by stannous chloride (SnCl2) through chemical cold vapor generation (CVG) reaction. Then, the Hg(0) was headspace extracted into 37μL thioglycolic acid functionalized AuNP aqueous suspension containing 10% methanol as extractant and simultaneously reacted with AuNPs through the strong metallophilic Hg-Au interaction, resulting in a red-to-blue color change...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28915466/synthesis-and-characterization-of-bright-green-terbium-coordination-complex-derived-from-1-4-bis-carbonylmethyl-terephthalate-structure-and-luminescence-properties
#4
Mengjiao Ma, Congcong Li, Dengkun Shu, Chaohua Wang, Peng Xi
A photoluminescent terbium (Tb) complex involving a novel benzoic-acid compound with a unique coordinated structure, namely 1,4-bis(carbonylmethyl)terephthalate (BCMT), has been designed and synthesized. The new coordinate structure and energy-transfer mechanism between the ligand and Tb(III) ions were investigated in detail. The results demonstrated that the BCMT-Tb(III) complex shows strong fluorescence intensity (4×10(6)a.u.) and long fluorescence lifetime (1.302ms), owing to the favorable degree of energy matching between the triplet excited level of the ligand and the resonant level of Tb(III) ions...
September 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28914359/changes-in-acid-base-and-ion-balance-during-exercise-in-normoxia-and-normobaric-hypoxia
#5
Olaf Lühker, Marc Moritz Berger, Alexander Pohlmann, Lorenz Hotz, Tilmann Gruhlke, Marcel Hochreiter
PURPOSE: Both exercise and hypoxia cause complex changes in acid-base homeostasis. The aim of the present study was to investigate whether during intense physical exercise in normoxia and hypoxia, the modified physicochemical approach offers a better understanding of the changes in acid-base homeostasis than the traditional Henderson-Hasselbalch approach. METHODS: In this prospective, randomized, crossover trial, 19 healthy males completed an exercise test until voluntary fatigue on a bicycle ergometer on two different study days, once during normoxia and once during normobaric hypoxia (12% oxygen, equivalent to an altitude of 4500 m)...
September 15, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28906526/a-series-of-mg-zn-heterometallic-coordination-polymers-synthesis-characterization-and-fluorescence-sensing-for-fe-3-cs2-and-nitroaromatic-compounds
#6
Zhao-Feng Wu, Xiao-Ying Huang
Herein, the solvothermal preparations, crystal structures, and fluorescence properties of three Mg-Zn heterometallic coordination polymers (CPs), i.e. [Mg2Zn2(OH)2(1,4-NDC)3(H2O)2]·6H2O (1), [Mg1.13Zn1.87(1,4-NDC)3(dppe)(CH3OH)] (2), and [Mg1.17Zn1.83(1,4-NDC)3(py)2]·1.5py (3), based on the mixed ligands of 1,4-naphthalene dicarboxylic acid (1,4-H2NDC) and N-containing ligands of 1,3-di(4-pyridyl)propane (dppe) or pyridine (py) are presented. In the title compounds, Zn and Mg are statistically distributed, as confirmed by single crystal analysis, and the ratios of Zn and Mg have been identified by inductively coupled plasma (ICP) measurements...
September 14, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28901715/engineering-microbial-metabolite-dynamics-and-heterogeneity
#7
REVIEW
Alexander C Schmitz, Christopher J Hartline, Fuzhong Zhang
Monoclonal antibodies currently dominate the biopharmaceutical market with growing sales having reached 80 billion USD in 2016. As most top-selling mAbs are approaching the end of their patent life, biopharmaceutical companies compete fiercely in the biosimilars market. These two factors present a strong motivation for alternative process strategies and process optimization. In this work a novel purification strategy for monoclonal antibodies comprising phenylboronic acid multimodal chromatography for capture followed by polishing by ion exchange monolithic chromatography and packed bed hydrophobic interaction chromatography is presented and compared to the traditional protein-A-based process...
September 13, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28901658/monoclonal-antibodies-production-platforms-an-opportunity-study-of-a-non-protein-a-chromatographic-platform-based-on-process-economics
#8
António Lima Grilo, Marilia Mateus, M Raquel Aires-Barros, Ana M Azevedo
Monoclonal antibodies currently dominate the biopharmaceutical market with growing sales having reached 80 billion USD in 2016. As most top-selling mAbs are approaching the end of their patent life, biopharmaceutical companies compete fiercely in the biosimilars market. These two factors present a strong motivation for alternative process strategies and process optimization. In this work a novel purification strategy for monoclonal antibodies comprising phenylboronic acid multimodal chromatography for capture followed by polishing by ion exchange monolithic chromatography and packed bed hydrophobic interaction chromatography is presented and compared to the traditional protein-A-based process...
September 13, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28901358/cadmium-1-4-cyclohexanedicarboxylato-coordination-polymers-bearing-different-di-alkyl-2-2-bipyridines-syntheses-crystal-structures-and-photoluminescence-studies
#9
Luis D Rosales-Vázquez, Víctor Sánchez-Mendieta, Alejandro Dorazco-González, Diego Martínez-Otero, Iván García-Orozco, Raúl A Morales-Luckie, Jonathan Jaramillo-Garcia, Antonio Téllez-López
Four coordination polymers have been synthesized using self-assembly solution reactions under ambient conditions, reacting Cd(ii) ions with 1,4-cyclohexanedicarboxylic acid in the presence of different 2,2'-bipyridine co-ligands: {[Cd(H2O)(e,a-cis-1,4-chdc)(2,2'-bpy)]·H2O}n (1); [Cd2(H2O)2(e,a-cis-1,4-chdc)2(4,4'-dmb)2]n (2); {[Cd(e,a-cis-1,4-chdc)(5,5'-dmb)]·H2O·CH3OH}n (3) and {[Cd(e,e-trans-1,4-chdc)(4,4'-dtbb)]·CH3OH}n (4), where 1,4-chdc = 1,4-cyclohexanedicarboxylato, 2,2'-bpy = 2,2'-bipyridine, 4,4'-dmb = 4,4'-dimethyl-2,2'-bipyridine, 5,5'-dmb = 5,5'-dimethyl-2,2'-bipyridine and 4,4'-dtbb = 4,4'-di-tert-butyl-2,2'-bipyridine...
September 13, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28901353/separate-mechanisms-of-ion-oligomerization-tune-the-physicochemical-properties-of-n-butylammonium-acetate-cation-base-clusters-vs-anion-acid-dimers
#10
Paula Berton, Steven P Kelley, Hui Wang, Allan S Myerson, Robin D Rogers
We investigated the ability of the ions comprising protic ionic liquids to strongly interact with their neutral acid and base forms through the characterization of n-butylammonium acetate ([C4NH3][OAc]) in the presence of excess n-butylamine (C4NH2) or excess acetic acid (HOAc). The conjugate and parent acid or base form new nonstoichiometric, noncovalently bound species (i.e., oligomeric ions) which change the physical and chemical properties of the resulting liquids, thus offering tunability. The effects of adding C4NH2 or HOAc to [C4NH3][OAc] on the resulting thermal and spectroscopic properties differ and suggest that C4NH2 interacts primarily with [C4NH3](+) to form 3-dimensional polymeric networks likely similar to those in H2O/[H3O](+), while HOAc interacts primarily with [OAc](-) to form oligomeric ions (e...
September 13, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28894868/rare-earth-ions-enhanced-near-infrared-fluorescence-of-ag2s-quantum-dots-for-the-detection-of-fluoride-ions-in-living-cells
#11
Caiping Ding, Xuanyu Cao, Cuiling Zhang, Tangrong He, Nan Hua, Yuezhong Xian
In this work, a novel phenomenon was discovered that the fluorescence intensity of silver sulfide quantum dots (Ag2S QDs) could be enhanced in the presence of rare earth ions through aggregation-induced emission (AIE). Based on the strong coordination between rare earth ions and F(-), a facile and label-free strategy was developed for the detection of F(-) in living cells. Ag2S QDs were synthesized using 3-mercaptopropionic acid as sulfur source and stabilizer in aqueous solution. The near infrared (NIR) emitting QDs exhibited excellent photostalilty, high quantum yield and low toxic...
September 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28887200/purification-and-characterization-of-a-novel-anti-staphylococcal-peptide-asp-1-from-bacillus-sp-urid-12-1
#12
Ajay Ghosh Chalasani, Utpal Roy, Sushma Nema
A strong anti-methicillin resistant Staphylococcus aureus (MRSA) peptide (ASP-1) from the Bacillus subtilis URID 12.1 strain that is active against cefoxitin- and methicillin-resistant clinical isolates was purified to homogeneity by solvent extraction, silica gel-based adsorption chromatography and reversed phase High Performance Liquid Chromatography. The peptide sequence of ASP-1 as determined by MALDI-TOF/MS and ESI-FTICR MS was acetylated Phe-Thr-Ala-Val-Dhb-Phe-Ile/Leu. The peptide was further analyzed by alkaline hydrolysis, ESI-Q-TOF-MS and an ion mobility assay, which detected the presence of a lactone ring in the intact peptide and a cyclic nature, subsequently revealing the peptide sequence as acPhe-Thr-Val-Ala-Dhb-Phe-Ile/Leu...
September 5, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28868887/controllable-preparation-of-cufemno4-nanospheres-as-a-novel-multifunctional-affinity-probe-for-efficient-adsorption-and-selective-enrichment-of-low-abundance-peptides-and-phosphopeptides
#13
Xing-Yu Long, Zi-Jin Zhang, Jia-Yuan Li, Dong Sheng, Hong-Zhen Lian
A facile solvothermal method for the synthesis of multifunctional magnetic CuFeMnO4 nanospheres affinity probe (NSAP) with controllable morphology and size was developed for the first time. The CuFeMnO4 nanospheres combine the brilliant features of Cu(2+), Fe(3+), and Mn(2+) ions, so their multifunction performances are embodied by strong coordination to carboxyl and amine groups of peptides (Cu(2+) and Fe(3+)), special affinity to phosphate groups of phosphopeptides (Fe(3+) and Mn(2+)), and high magnetic responsiveness in a magnetic field...
September 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28853861/renal-clearable-ultrasmall-coordination-polymer-nanodots-for-chelator-free-64-cu-labeling-and-imaging-guided-enhanced-radiotherapy-of-cancer
#14
Sida Shen, Dawei Jiang, Liang Cheng, Yu Chao, Kaiqi Nie, Ziliang Dong, Christopher J Kutyreff, Jonathan W Engle, Peng Huang, Weibo Cai, Zhuang Liu
Developing tumor-homing nanoparticles with integrated diagnostic and therapeutic functions, and meanwhile could be rapidly excreted from the body, would be of great interest to realize imaging-guided precision treatment of cancer. In this study, an ultrasmall coordination polymer nanodot (CPN) based on the coordination between tungsten ions (W(VI)) and gallic acid (W-GA) was developed via a simple method. After polyethylene glycol (PEG) modification, PEGylated W-GA (W-GA-PEG) CPNs with an ultrasmall hydrodynamic diameter of 5 nm were rather stable in various physiological solutions...
September 5, 2017: ACS Nano
https://www.readbyqxmd.com/read/28842026/blue-emitting-copper-nanoparticles-as-a-fluorescent-probe-for-detection-of-cyanide-ions
#15
Safieh Momeni, Raheleh Ahmadi, Afsaneh Safavi, Iraj Nabipour
A simple and green method for the determination of cyanide ions (CN(-)) has been developed which is based on copper nanoparticles (CuNPs) acting as a fluorescent probe in aqueous solutions. In this study, fluorescent CuNPs have been synthesized in the presence of ascorbic acid which acts both as a reducing and protecting agent. The preparation of CuNPs by this method is very simple, low cost, high yield, and reproducible. The prepared CuNPs have the small average diameter of 10nm and show a blue emission at 440nm...
December 1, 2017: Talanta
https://www.readbyqxmd.com/read/28833697/effect-of-intravenously-administered-crystalloid-solutions-on-acid-base-balance-in-domestic-animals
#16
REVIEW
W Muir
Intravenous fluid therapy can alter plasma acid-base balance. The Stewart approach to acid-base balance is uniquely suited to identify and quantify the effects of the cationic and anionic constituents of crystalloid solutions on plasma pH. The plasma strong ion difference (SID) and weak acid concentrations are similar to those of the administered fluid, more so at higher administration rates and with larger volumes. A crystalloid's in vivo effects on plasma pH are described by 3 general rules: SID > [HCO3-] increases plasma pH (alkalosis); SID < [HCO3-] decreases plasma pH (alkalosis); and SID = [HCO3-] yields no change in plasma pH...
September 2017: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/28825760/copper-coordination-polymer-controlled-cu-n-rgo-and-cuo-c-nanoparticle-formation-reusable-green-catalyst-for-a-3-coupling-and-nitroarene-reduction-reactions
#17
Vadivel Vinod Kumar, Rajamani Rajmohan, Pothiappan Vairaprakash, Mariappan Mariappan, Savarimuthu Philip Anthony
The intriguing structural properties of coordination polymers (COPs), together with the huge variety of metal ions and organic linkers to choose from, make COPs potential precursors for fabricating carbon-encapsulated metal and metal oxide nanoparticles (NPs). Herein, we have studied the role of the COP structural assembly, prepared through making subtle changes to the ligand structure, on the formation of NPs in a carbon matrix. Cu-COPs (Cu-COP-1-Cu-COP-7), generated using different amino acid-based reduced Schiff base phenolic chelating ligands, exhibited crystalline structures with differing structural organization in the solid state...
September 12, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28822252/removal-of-gadolinium-a-neutron-poison-from-the-moderator-system-of-nuclear-reactors
#18
A L Rufus, Padma S Kumar, K Jeena, S Velmurugan
Gadolinium as gadolinium nitrate is used as neutron poison in the moderator system for regulating and controlling the power generation of Pressurized Heavy Water Reactors (PHWR) and proposed to be used in Advanced Heavy Water Reactors (AHWR) owing to its high neutron absorption cross section. Removal of the added gadolinium nitrate (Gd(3+) and NO3(-)) from the system after its intended use is done using ion exchange resins. In the present investigation, attempts have been made to optimize the ion exchange process for generation of low radioactive waste and maximize utilization of the ion exchange resins by employing different types of resins and different modes of operation...
August 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28814306/blood-acid-base-status-in-impala-aepyceros-melampus-immobilised-and-maintained-under-total-intravenous-anaesthesia-using-two-different-drug-protocols
#19
Gareth E Zeiler, Leith C R Meyer
BACKGROUND: In mammals, homeostasis and survival are dependent on effective trans-membrane movement of ions and enzyme function, which are labile to extreme acid-base changes, but operate efficiently within a narrow regulated pH range. Research in patients demonstrating a pH shifts outside the narrow regulated range decreased the cardiac output and systemic vascular resistance and altered the oxygen binding to haemoglobin. These cardiopulmonary observations may be applicable to the risks associated with anaesthesia and performance of wildlife ungulates on game farms...
August 16, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28810120/aqueous-solvation-of-ammonia-and-ammonium-probing-hydrogen-bond-motifs-with-ft-ir-and-soft-x-ray-spectroscopy
#20
Maria Ekimova, Wilson Quevedo, Łukasz Szyc, Marcella Iannuzzi, Philippe Wernet, Michael Odelius, Erik T J Nibbering
In a multifaceted investigation combining local soft X-ray and vibrational spectroscopic probes with ab initio molecular dynamics simulations, hydrogen-bonding interactions of two key principal amine compounds in aqueous solution, ammonia (NH3) and ammonium ion (NH4(+)), are quantitatively assessed in terms of electronic structure, solvation structure, and dynamics. From the X-ray measurements and complementary determination of the IR-active hydrogen stretching and bending modes of NH3 and NH4(+) in aqueous solution, the picture emerges of a comparatively strongly hydrogen-bonded NH4(+) ion via N-H donating interactions, whereas NH3 has a strongly accepting hydrogen bond with one water molecule at the nitrogen lone pair but only weakly N-H donating hydrogen bonds...
August 30, 2017: Journal of the American Chemical Society
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