keyword
MENU ▼
Read by QxMD icon Read
search

acid-base

keyword
https://www.readbyqxmd.com/read/27904094/design-and-synthesis-of-functional-molecules-based-on-complexation-and-their-biological-applications
#1
Yosuke Hisamatsu
 In this review, we introduce the development of supermolecules, host-guest complexes, and metal complexes formed from the combination of non-covalent interactions and/or coordination bonds, as well as their biological applications. An adenine selective host molecule 1 provides a correctly oriented array of complementary hydrogen bonding sites for the adenine nucleobase. Furthermore, the new DDAA (D: hydrogen bond donor, A: hydrogen bond acceptor) module 4 and ADDA module 7 have been developed as quadruple hydrogen-bonding modules...
2016: Yakugaku Zasshi: Journal of the Pharmaceutical Society of Japan
https://www.readbyqxmd.com/read/27904080/an-ic-ms-ms-method-for-the-determination-of-1-hydroxyethylidene-1-1-diphosphonic-acid-on-uncooked-foods-treated-with-peracetic-acid-based-sanitizers
#2
Ippei Suzuki, Hiroki Kubota, Takashi Ohtsuki, Chiye Tatebe, Atsuko Tada, Takeo Yano, Hiroshi Akiyama, Kyoko Sato
A rapid, sensitive, and specific analytical method for the determination of 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) on uncooked foods after treatment with a peracetic acid-based sanitizer (PAS) was developed. The method involves simple sample preparation steps and analysis using ion chromatography (IC) coupled with tandem mass spectrometry (MS/MS). The quantification limits of HEDP on uncooked foods are 0.007 mg/kg for vegetables and fruits and 0.2 mg/kg for meats. The recovery and relative standard deviation (RSD) of HEDP analyses of uncooked foods ranged from 73...
2016: Chemical & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/27902183/lactobacillus-ixorae-sp-nov-isolated-from-a-flower-west-indian-jasmine
#3
Sujitra Techo, Mika Miyashita, Chiyo Shibata, Naoto Tanaka, Preeyarach Wisetkhan, Wonnop Visessanguan, Somboon Tanasupawat
A Gram-stain positive, lactic acid bacterium strain Ru20-1T was isolated from a flower (West-Indian Jasmine) collected from Kalasin province, Thailand. Polyphasic approaches were used to determine the taxonomic position of this strain. Studies of morphological and biochemical characteristics revealed that strain Ru20-1T belonged to the genus Lactobacillus. The strain was heterofermentative, non-spore forming and rod-shaped. It produced DL-lactic acid. Based on 16S rRNA gene sequences similarity, this strain was closely related to Lactobacillus lindneri LMG 14528T (96...
October 11, 2016: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/27901314/effects-of-hypoxia-and-hypercapnic-hypoxia-on-oxygen-transport-and-acid-base-status-in-the-atlantic-blue-crab-callinectes-sapidus-during-exercise
#4
Mark P Lehtonen, Louis E Burnett
The responses of estuarine invertebrates to hypoxic conditions are well established. However, many studies have investigated hypoxia as an isolated condition despite its frequent co-occurrence with hypercapnia (elevated CO2 ). Although many studies suggest deleterious effects, hypercapnia has been observed to improve blue crab walking performance in hypoxia. To investigate the physiological effects of combined hypercapnic hypoxia, we measured Po2 , pH, [l-lactate], Pco2 , and total O2 in pre- and postbranchial hemolymph sampled from blue crabs during walking exercise...
November 30, 2016: Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology
https://www.readbyqxmd.com/read/27901142/an-optimized-charge-penetration-model-for-use-with-the-amoeba-force-field
#5
Joshua A Rackers, Qiantao Wang, Chengwen Liu, Jean-Philip Piquemal, Pengyu Ren, Jay W Ponder
The principal challenge of using classical physics to model biomolecular interactions is capturing the nature of short-range interactions that drive biological processes from nucleic acid base stacking to protein-ligand binding. In particular most classical force fields suffer from an error in their electrostatic models that arises from an ability to account for the overlap between charge distributions occurring when molecules get close to each other, known as charge penetration. In this work we present a simple, physically motivated model for including charge penetration in the AMOEBA (Atomic Multipole Optimized Energetics for Biomolecular Applications) force field...
November 30, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27900812/spontaneous-assembly-of-an-organic-inorganic-nucleic-acid-z-dna-double-helix-structure
#6
Vladislav Kulikov, Naomi A B Johnson, Andrew J Surman, Marie Hutin, Sharon M Kelly, Mohammed Hezwani, De-Liang Long, Gerd Meyer, Leroy Cronin
Herein, we report a hybrid polyoxometalate organic-inorganic compound, Na2 [(HGMP)2 Mo5 O15 ]⋅7 H2 O (1; where GMP=guanosine monophosphate), which spontaneously assembles into a structure with dimensions that are strikingly similar to those of the naturally occurring left-handed Z-form of DNA. The helical parameters in the crystal structure of the new compound, such as rise per turn and helical twist per dimer, are nearly identical to this DNA conformation, allowing a close comparison of the two structures...
November 30, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27900717/intravenous-fluids-balancing-solutions
#7
REVIEW
Ewout J Hoorn
The topic of intravenous (IV) fluids may be regarded as "reverse nephrology", because nephrologists usually treat to remove fluids rather than to infuse them. However, because nephrology is deeply rooted in fluid, electrolyte, and acid-base balance, IV fluids belong in the realm of our specialty. The field of IV fluid therapy is in motion due to the increasing use of balanced crystalloids, partly fueled by the advent of new solutions. This review aims to capture these recent developments by critically evaluating the current evidence base...
November 29, 2016: Journal of Nephrology
https://www.readbyqxmd.com/read/27898331/cleaning-verification-exploring-the-effect-of-the-cleanliness-of-stainless-steel-surface-on-sample-recovery
#8
Imad A Haidar Ahmad, James Tam, Xue Li, William Duffield, Thomas Tarara, Andrei Blasko
The parameters affecting the recovery of pharmaceutical residues from the surface of stainless steel coupons for quantitative cleaning verification method development have been studied, including active pharmaceutical ingredient (API) level, spiking procedure, API/excipient ratio, analyst-to-analyst variability, inter-day variability, and cleaning procedure of the coupons. The lack of a well-defined procedure that consistently cleaned coupon surface was identified as the major contributor to low and variable recoveries...
November 18, 2016: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/27894793/a-quick-reference-on-anion-gap-and-strong-ion-gap
#9
REVIEW
Carlos Torrente Artero
Metabolic acid-base disorders are common in emergency and critically ill patients. Clinicians may have difficulty recognizing their presence when multiple acid-base derangements are present in a single patient simultaneously. The anion gap and the strong ion gap concepts are useful calculations to identify the components of complex metabolic acid-base associated to the presence of unmeasured anions. This article presents their definition, normal values, indications, limitations, and guidelines for interpretation of changes in the clinical setting...
November 25, 2016: Veterinary Clinics of North America. Small Animal Practice
https://www.readbyqxmd.com/read/27894792/pyruvate-dehydrogenase-e1%C3%AE-deficiency-presenting-as-recurrent-acute-proximal-muscle-weakness-of-upper-and-lower-extremities-in-an-8-year-old-boy
#10
Bülent Kara, Hülya Maraş Genç, Emek Uyur-Yalçın, Ayfer Sakarya-Güneş, Uğur Topçu, Serap Mülayim, Serdar Ceylaner
The mitochondrial pyruvate dehydrogenase enzyme complex (PDHC) plays an important role in aerobic energy metabolism and acid-base equilibrium. PDHC contains of 5 enzymes, 3 catalytic (E1, E2, E3) and 2 regulatory, as well as 3 cofactors and an additional protein (E3-binding protein) encoded by nuclear genes. The clinical presentation of PDHC deficiency ranges from fatal neonatal lactic acidosis to chronic neurologic dysfunction without lactic acidosis. Paroxysmal neurologic problems such as intermittent ataxia, episodic weakness, exercise-induced dystonia and recurrent demyelination may also be seen although they are rare...
November 9, 2016: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/27893431/dysregulated-human-tyrosyl-dna-phosphodiesterase-i-acts-as-cellular-toxin
#11
Selma M Cuya, Evan Q Comeaux, Keith Wanzeck, Karina J Yoon, Robert C A M van Waardenburg
Tyrosyl-DNA phosphodiesterase I (TDP1) hydrolyzes the drug-stabilized 3'phospho-tyrosyl bond formed between DNA topoisomerase I (TOPO1) and DNA. TDP1-mediated hydrolysis uses a nucleophilic histidine (Hisnuc) and a general acid/base histidine (Hisgab). A Tdp1Hisgab to Arg mutant identified in patients with the autosomal recessive neurodegenerative disease SCAN1 causes stabilization of the TDP1-DNA intermediate. Based on our previously reported Hisgab-substitutions inducing yeast toxicity (Gajewski et al. J...
November 23, 2016: Oncotarget
https://www.readbyqxmd.com/read/27890901/can-colorectal-delivery-technology-provide-a-platform-for-enteral-oligonucleotide-based-therapeutics
#12
Masahiro Murakami, Chie Watanabe
Nucleic acid-based therapeutics including antisense and siRNA oligonucleotides has been expected as an innovative treatment for intractable diseases. Oral drug delivery is the most patient-friendly route of administration but developing an effective delivery system for oligonucleotides remains a major challenge. In this commentary, we discuss the potential benefits of the colorectal route as another platform for the development of oral oligonucleotide therapeutics. The importance of the targeting or the availability of oligonucleotides in targeted tissue is highlighted in contrast to systemic availability, while the liver-targeted enteral siRNA delivery technology that we recently developed is introduced...
2016: Drug Discoveries & Therapeutics
https://www.readbyqxmd.com/read/27890681/continent-anal-urinary-diversion-in-classic-bladder-exstrophy-45-year-experience
#13
Peter Rubenwolf, Christian Hampel, Frederik Roos, Raimund Stein, Sebastian Frees, Joachim W Thüroff, Christian Thomas
OBJECTIVE: To evaluate the long-term outcomes in patients with classic bladder exstrophy (CBE) and continent anal urinary diversion (CAD) for continence, upper urinary tract status, secondary malignancies and sexual function. PATIENTS AND METHODS: The medical records of 82 exstrophy patients having undergone CAD in our department between 1970 and 2015 were reviewed. Patients were invited for follow-up examinations and asked to complete validated questionnaires relating to sexual function...
November 24, 2016: Urology
https://www.readbyqxmd.com/read/27890670/updating-molecular-properties-during-early-drug-discovery
#14
Giulia Caron, Giuseppe Ermondi
Current multiparameter optimization (MPO) strategies make use of few experimental physicochemical descriptors (i.e., solubility at physiological pH and lipophilicity in the octanol/water system). Here, we show how new trends in drug discovery (i.e., large and flexible molecules for 'difficult' targets) call for the integration of ad hoc descriptors in MPO approaches. In particular, to rank, select, and optimize drug candidates, it could be relevant to have experimental data relating to the acid-base properties and the folding of the molecule to mask polar groups (so-called 'chameleonic' properties)...
November 23, 2016: Drug Discovery Today
https://www.readbyqxmd.com/read/27890436/respiratory-acid-base-disorders-in-the-critical-care-unit
#15
REVIEW
Kate Hopper
The incidence of respiratory acid-base abnormalities in the critical care unit (CCU) is unknown, although respiratory alkalosis is suspected to be common in this population. Abnormal carbon dioxide tension can have many physiologic effects, and changes in Pco2 may have a significant impact on outcome. Monitoring Pco2 in CCU patients is an important aspect of critical patient assessment, and identification of respiratory acid-base abnormalities can be valuable as a diagnostic tool. Treatment of respiratory acid-base disorders is largely focused on resolution of the primary disease, although mechanical ventilation may be indicated in cases with severe respiratory acidosis...
November 24, 2016: Veterinary Clinics of North America. Small Animal Practice
https://www.readbyqxmd.com/read/27887908/the-yin-and-yang-of-nucleic-acid-based-therapy-in-the-brain
#16
REVIEW
Stefano Gustincich, Silvia Zucchelli, Antonello Mallamaci
The post-genomic era has unveiled the existence of a large repertory of non-coding RNAs and repetitive elements that play a fundamental role in cellular homeostasis and dysfunction. These may represent unprecedented opportunities to modify gene expression at the right time in the correct space in vivo, providing an almost unlimited reservoir of new potential pharmacological agents. Hijacking their mode of actions, the druggable genome can be extended to regulatory RNAs and DNA elements in a scalable fashion...
November 22, 2016: Progress in Neurobiology
https://www.readbyqxmd.com/read/27886776/synthesis-and-performance-of-chiral-ferrocene-modified-silica-gel-for-mixed-mode-chromatography
#17
Lijun Qiao, Xiaohua Zhou, Xue Li, Wenrui Du, Ajuan Yu, Shusheng Zhang, Yangjie Wu
A brush-type chiral stationary phase, N-ferrocenyl benzoyl-(1S, 2R)-1, 2-diphenyl ethanol-bonded on the silica gel (NFcBEs) for high performance liquid chromatography (HPLC), was prepared using γ-glycidoxypropyltrimethoxysilane as coupling reagent. The structure of this novel material was characterized by infrared spectroscopy, elemental analysis and thermogravimetric analysis. Mechanism involved in the chromatographic separation is the multi-interaction including hydrophobic, π-π, hydrogen-bonding, π-charge transfer, dipole-dipole and acid-base equilibrium interactions...
January 15, 2017: Talanta
https://www.readbyqxmd.com/read/27885835/sequential-enzymatic-conversion-of-%C3%AE-angelica-lactone-to-%C3%AE-valerolactone-through-hydride-independent-c-c-bond-isomerization
#18
Nikolaus G Turrini, Elisabeth Eger, Tamara C Reiter, Kurt Faber, Mélanie Hall
A case of hydride-independent reaction catalyzed by flavin-dependent ene-reductases from the Old Yellow Enzyme (OYE) family was identified. α-Angelica lactone was isomerized to the conjugated β-isomer in a nicotinamide-free and hydride-independent process. The catalytic cycle of C=C bond isomerization appears to be flavin-independent and to rely solely on a deprotonation-reprotonation sequence through acid-base catalysis. Key residues in the enzyme active site were mutated and provided insight on important mechanistic features...
November 25, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27885767/novel-amino-acid-based-%C3%AE-phosphorylated-nitroxides-for-probing-acidic-ph-in-biological-systems-by-epr-spectroscopy
#19
Sophie Thétiot-Laurent, Gaëlle Gosset, Jean-Louis Clément, Mathieu Cassien, Anne Mercier, Didier Siri, Anouk Gaudel-Siri, Antal Rockenbauer, Marcel Culcasi, Sylvia Pietri
There is increasing attraction of measuring pH in biological studies using nitroxides having pH-dependent electron paramagnetic resonance (EPR) spectra. Aiming to improve the spectral sensitivity, ΔaX, of these probes (i.e. the difference between the EPR hyperfine splittings (hfs) in their protonated and unprotonated forms), we present here a series of novel linear α-carboxy, α'-diethoxyphosphoryl nitroxides constructed on an amino acid core and featuring a (α or α')-C-H bond. In buffers the three main hfs (aN, aH and aP) of their EPR spectra vary reversibly with pH and, when it is inferred from aP or aH titration curves, a 2-4-fold increase in sensitivity is achieved vs reference imidazoline or imidazolidine nitroxides...
November 25, 2016: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/27885573/poly-%C3%AE-glutamic-acid-and-poly-%C3%AE-glutamic-acid-based-nanocomplexes-enhance-type-ii-collagen-production-in-intervertebral-disc
#20
Joana C Antunes, Catarina Leite Pereira, Graciosa Q Teixeira, Ricardo V Silva, Joana Caldeira, Sibylle Grad, Raquel M Gonçalves, Mário A Barbosa
Intervertebral disc (IVD) degeneration often leads to low back pain, which is one of the major causes of disability worldwide, affecting more than 80% of the population. Although available treatments for degenerated IVD decrease symptoms' progression, they fail to address the underlying causes and to restore native IVD properties. Poly(γ-glutamic acid) (γ-PGA) has recently been shown to support the production of chondrogenic matrix by mesenchymal stem/stromal cells. γ-PGA/chitosan (Ch) nanocomplexes (NCs) have been proposed for several biomedical applications, showing advantages compared with either polymer alone...
January 2017: Journal of Materials Science. Materials in Medicine
keyword
keyword
21443
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"