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acid base strong ion

Yang Jiao, Zhenzi Bai, Jingyu Xu, Mingli Zhao, Yaseen Khan, Yongjun Hu, Lianxuan Shi
Wild soybean (Glycine soja) is an excellent germplasm resource and has strong resistance and wide adaptability to different environments. Hence, the physiology and metabolomics characteristics of wild soybean under different types of salt stress were determined to improve understanding of salt-tolerant mechanisms of wild soybean in the field. Two types of wild soybean seedlings were exposed to two different types of salt stress for 14 d. The photosynthesis of wild soybean seedling extracts were analyzed using metabolomics based on gas chromatography-mass spectrometry...
March 5, 2018: Plant Physiology and Biochemistry: PPB
Deepak Bhandari, Brett A Bowman, Anish B Patel, David M Chambers, Víctor R De Jesús, Benjamin C Blount
This work describes a quantitative high-throughput analytical method for the simultaneous measurement of small aliphatic nitrogenous biomarkers, i.e., 1,6-hexamethylenediamine (HDA), isophoronediamine (IPDA), β-methylamino-l-alanine (BMAA), and trimethylamine N-oxide (TMAO), in human urine. Urinary aliphatic diamines, HDA and IPDA, are potential biomarkers of environmental exposure to their corresponding diisocyanates. Urinary BMAA forms as a result of human exposure to blue-green algae contaminated food. And, TMAO is excreted in urine due to the consumption of carnitine- and choline-rich diets...
March 2, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Xuejiao Chen, Fuchun Gong, Zhong Cao, Wu Zou, Tingting Gu
Strongly green fluorescent carbon dots (CQDs) have been directly synthesized from 2,4-diaminophenylhydrazine and 2-hydroxy-5-methylisophthalaldehyde through a facile solvothermal method. The novel CQDs exhibit high fluorescence quantum yield and excellent water solubility due to the abundant amino and hydroxy groups on their surface. The use of the as-prepared CQDs combined with Cu2+ constructed a "turn-on" switch cysteine-responsive nanoprobe. In the CQDs-Cu2+ assemblies, the binding of Cu2+ to CQDs results in the fluorescence quenching of CQDs by electron transfer mechanism, while the addition of cysteine leads to the fluorescence recovery because of the competitive binding between cysteine and CQDs to Cu2+ ...
March 9, 2018: Analytical and Bioanalytical Chemistry
Melissa B De Biasse, Yasmeen Kawji, Morgan W Kelly
Species inhabiting the North American west coast intertidal must tolerate an extremely variable environment, with large fluctuations in both temperature and salinity. Uncovering the mechanisms for this tolerance is key to understanding species' persistence. We tested for differences in salinity tolerance between populations of Tigriopus californicus copepods from locations in northern (Bodega Reserve) and southern (San Diego) California known to differ in temperature, precipitation, and humidity. We also tested for differences between populations in their transcriptomic responses to salinity...
March 6, 2018: Molecular Ecology
Katja N Adamik, Rafael Obrador, Judith Howard
OBJECTIVE: To evaluate the effects of a 6% hydroxyethyl starch (130/0.42) in either a buffered, electrolyte-balanced (HES-BAL) or saline (HES-SAL) carrier solution on electrolyte concentrations and acid-base parameters in healthy anaesthetized dogs. STUDY DESIGN: Prospective randomised clinical study. ANIMALS: A group of 40 client-owned dogs undergoing general anaesthesia for elective surgical procedures or diagnostic imaging. METHODS: During anaesthesia, dogs were intravenously administered 15 mL kg-1 of either HES-SAL (n = 20) or HES-BAL (n = 20) over 30-40 minutes...
January 11, 2018: Veterinary Anaesthesia and Analgesia
Kai-Chih Chang, Chin-Yi Chung, Chen-Hsing Yeh, Kuo-Hsiu Hsu, Ya-Ching Chin, Sin-Siang Huang, Bo-Rong Liu, Hsi-An Chen, Anren Hu, Po-Chi Soo, Wen-Ping Peng
The appearance and spread of carbapenem-resistant Acinetobacter baumannii (CRAB) pose a challenge for optimization of antibiotic therapies and outbreak preventions. The carbapenemase production can be detected through culture-based methods (e.g. Modified Hodge Test-MHT) and DNA based methods (e.g. Polymerase Chain Reaction-PCR). The culture-based methods are time-consuming, whereas those of PCR assays need only a few hours but due to its specificity, can only detect known genetic targets encoding carbapenem-resistance genes...
February 27, 2018: Journal of Microbiological Methods
K M Frizzell, M J Jendral, I M Maclean, W T Dixon, C T Putman
1. Post-mortem decline in muscle pH ([H+ ]) is controlled by complex physicochemical relationships encapsulated in the Stewart Model of acid-base chemistry and is determined by three systems-independent variables - strong ion difference([SID]), total concentration of weak acids([Atot ]) and partial pressure of CO2 (PCO2 ). 2. This study investigated these systems-independent variables in post-mortem pectoralis major muscles of Shaver White (SH), Lohmann Lite (LL) and Lohmann Brown (LB) laying hens housed in conventional cages (CC) or furnished cages (FC), and evaluated the Model by comparing calculated [H+ ] with previously measured [H+ ] values (Frizzell et al...
February 26, 2018: British Poultry Science
Ping Luo, Alejandro Roca, Karen Tiede, Katie Privett, Jiachao Jiang, John Pinkstone, Guibin Ma, Jonathan Veinot, Alisatair Boxall
Novel applications of nanotechnology may lead to the release of engineered nanoparticles (ENPs), which result in concerns over their potential environmental hazardous impact. It is essential for the research workers to be able to quantitatively characterise ENPs in the environment and subsequently to assist the risk assessment of the ENPs. This study hence explored the application of nanoparticle tracking system (NTA) to quantitatively describe the behaviour of the ENPs in natural sediment-water systems. The NTA allows the measurement of both particle number concentration (PNC) and particle size distribution (PSD) of the ENPs...
February 2018: Journal of Environmental Sciences (China)
Haydee Izurieta Munoz, Eric B Gonzales, Nathalie Sumien
BACKGROUND: The objective of this study was to evaluate creatine as an anti-nociceptive compound in an animal model of thermal and inflammatory pain. Creatine has the structural potential to interact with acid-sensing ion channels (ASIC), which have been involved in pain sensation modulation. The hypothesis evaluated in this study was that creatine will interact with ASICs leading to decreased nociception. METHODS: Male and female C57BL/6J mice were fed with either a control diet or the control diet supplemented with creatine (6...
November 11, 2017: Pharmacological Reports: PR
Abirami R Ganesan, M Shanmugam, Rajeev Bhat
Edible films were developed from seaweed polysaccharides (Kappaphycus alvarezii and Ulva fasciata). The total extracted yield of semi refined carrageenan (SRC) and ulvan polysaccharide was 31.55%, and 28.86%, with total carbohydrate being 78.08% and 82.43% in SRC and ulvan polysaccharides. Results of viscometric studies revealed molecular weight to be 210 kDa and 72 kDa for SRC and ulvan polysaccharides. Proton NMR studies showed presence of anhydro-d-galactopyranose and glucosidic linkages in SRC, while ulvan polysaccharide had rhamnose-3-sulfate, glucosyl and β-d-glucuronic acid...
February 15, 2018: International Journal of Biological Macromolecules
Haiying She, Xiaochen Ma, Ganggang Chang
An adsorbent with multiple interaction sites for the adsorption of nitrogen-containing compounds (NCCs) has been realized in a silver ion functionalized Cr 3+ based metal-organic framework (Cr)-MIL-101-SO 3 Ag. The adsorptive denitrogenation performance of (Cr)-MIL-101-SO 3 Ag was evaluated in a batch adsorption system in terms of both its adsorption capacity and selectivity, of which, quinoline and indole were selected as representative organonitrogen contaminants in liquid fuels. (Cr)-MIL-101-SO 3 Ag could interact with NCCs through multiple ways simultaneously, which exhibited about 50% higher adsorption capacity compared to (Cr)-MIL-101-SO 3 H, and a still high level of adsorption amount could be remained even in a model fuel where toluene (15% v) was added as a co-solvent and benzothiophene (BT) was added as a competitive adsorbate...
February 2, 2018: Journal of Colloid and Interface Science
Xiaojing Wang, Yi Yang, Guoping Du, Nan Chen, Aisheng Zhang
Lanthanide ion doped nanoparticles can coordinate with some organic ligands to form the inorganic-organic hybrid nanoparticles, which exhibit greatly enhanced luminescence as a result of the energy transfer from the organic ligands to the lanthanide ions. However, when coordinating with a single type of organic ligand, their luminescence excitation spectral bandwidth is still quite limited. In this work, Eu3+-doped LaF3 (LaF3:Eu3+) nanoparticles, as the model inorganic material, were synthesized using the hydrothermal method...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Nguyen Thi Sam, Ryo Misaki, Takao Ohashi, Kazuhito Fujiyama
Sialic acid plays important roles in stabilization and modulation of the interaction of molecules and membranes in organisms. Due to its high electronegativity, sialic acid can promote binding effects of molecules and support the transportation of drugs and ions in cells. This also strengthens cells against degradation from glycosidases and proteases. Hence sialic acid helps glycoproteins extend their half-lives and bioactivity. On the other hand, Chinese hamster ovary (CHO) cells have been widely used as a workhorse in biopharmaceutical fields in part due to the similarity between their glycan properties and those in humans...
February 10, 2018: Journal of Bioscience and Bioengineering
Reza Tabaraki, Negar Sadeghinejad
A novel, green, facile and dual turn-off/on sensor for detection of Hg2+ and I- was developed based on carbon dots. Carbon dots were synthesized from citric acid, urea, and thiourea by microwave-assisted method. The size of the carbon dots (CDs) was about 10 nm and the synthesized CDs showed a strong emission at 523 nm upon excitation at 416 nm. The fluorescence quantum yield was 19.2%. Mercury (II) quenched the fluorescence of carbon dots. This turn off sensor had linear response for Hg2+ over a concentration range from 0...
February 6, 2018: Ecotoxicology and Environmental Safety
Jian Chuan Ye, Jia Jia Chen, Ru Ming Yuan, Ding Rong Deng, Ming Sen Zheng, Leroy Cronin, Quan Feng Dong
Investigations of the Ag (I)-substituted Keggin K3[H3AgIPW11O39] as a bi-functional Lewis acid and basic catalyst are reported that explore the stabilization of Li2Sn moieties so that reversible redox reactions in S-based elec-trodes would be possible. Spectroscopic investigations showed that the Li2Sn-moieties can be strongly adsorbed on the {AgIPW11O39} cluster, where the Ag(I) ion can act as Lew-is acid site to further enhance the adsorption of the S-moieties, and these interactions were investigated and ra-tionalized using DFT...
February 9, 2018: Journal of the American Chemical Society
Jesse P Goff
Several minerals are required for life to exist. In animals, 7 elements (Ca, P, Mg, Na, K, Cl, and S) are required to be present in the diet in fairly large amounts (grams to tens of grams each day for the dairy cow) and are termed macrominerals. Several other elements are termed microminerals or trace minerals because they are required in much smaller amounts (milligrams to micrograms each day). In most cases the mineral in the diet must be absorbed across the gastrointestinal mucosa and enter the blood if it is to be of value to the animal...
January 31, 2018: Journal of Dairy Science
Dirk Weihrauch, Garett Joseph, Patrick Allen
Invertebrates employ a variety of ammonia excretion strategies to facilitate their survival in diverse aquatic environments, including freshwater, seawater and the water film surrounding soil particles. Various environmental properties set innate challenges for an organism's ammonia excretory capacity. These include the availability of NaCl and the respective ion-permeability of the organism's transport epithelia, and the buffering capacity of their immediate surrounding medium. To this end, some transporters seem to be conserved in the excretory process...
January 29, 2018: Journal of Experimental Biology
Baojiao Gao, Liqin Zhang, Dandan Zhang
Two kinds of bidentate Schiff base ligands derived from benzaldehyde, benzaldehyde/m-aminophenol (BAMA) type and benzaldehyde/glutamic acid (BAGL) type ligands, were synchronously synthesized and bonded on the backbone of polysulfone (PSF) through molecular design and by polymer reactions, and two functional polymers, PSF-BAMA and PSF-BAGL, were obtained. Then two series of novel luminescent Schiff base-type polymer-rare earth complexes were prepared via coordination reactions. In this work, the effects of the structures of the bonded ligands on the photoluminescence performance of the complexes were investigated in detail, and for the different photophysical properties of the prepared complexes, relevant theoretical explanations were given...
January 25, 2018: Physical Chemistry Chemical Physics: PCCP
Jason D Guffey, Curtis E Haas, Amber Crowley, Kathryn A Connor, David C Kaufman
BACKGROUND: Older reports of use of hydrochloric acid (HCl) infusions for treatment of metabolic alkalosis document variable dosing strategies and risk. OBJECTIVES: This study sought to characterize use of HCl infusions in surgical intensive care unit patients for the treatment of metabolic alkalosis. METHODS: This retrospective review included patients who received a HCl infusion for >8 hours. The primary end point was to evaluate the utility of common acid-base equations for predicting HCl dose requirements...
January 1, 2018: Annals of Pharmacotherapy
Sha Liu, Li Jing, Zhu-Jun Yu, Chengyong Wu, Yongxiang Zheng, En Zhang, Qiang Chen, Yamei Yu, Li Guo, Yong Wu, Guo-Bo Li
The emergence and global spread of metallo-β-lactamase (MBL) mediated resistance to almost all β-lactam antibacterials poses a serious threat to public health. Since no clinically useful MBL inhibitors have been reported, there is an urgent need to develop new potent broad-spectrum MBL inhibitors effective against antibacterial resistance. Herein, we synthesized a set of 2-substituted ((S)-3-mercapto-2-methylpropanamido) acetic acid derivatives, some of which displayed potent inhibition with high ligand efficiency to the clinically relevant MBL subtypes, Verona Integron-encoded MBL (VIM)-2 and New Delhi MBL (NDM)-1...
January 11, 2018: European Journal of Medicinal Chemistry
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