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https://www.readbyqxmd.com/read/29242863/cyclic-amino-carboranyl-silylene-synthesis-structure-and-reactivity
#1
Hao Wang, Tek Long Chan, Zuowei Xie
A carbene-stabilized cyclic amino(carboranyl) silylene has been prepared from the reaction of cyclic amino(carboranyl) chlorosilane with N-heterocyclic carbene via HCl elimination. Its structure has been characterized by single-crystal X-ray analysis and DFT calculations. It is a very strong σ donor and relatively poor π acceptor. It can form a Lewis acid-base adduct with borane and undergo cycloaddition reactions with unsaturated molecules such as diphenylacetylene and benzophenone.
December 15, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29242249/acidosis-and-deafness-in-patients-with-recessive-mutations-in-foxi1
#2
Sven Enerbäck, Daniel Nilsson, Noel Edwards, Mikael Heglind, Sumaya Alkanderi, Emma Ashton, Asma Deeb, Feras E B Kokash, Abdulrahim R A Bakhsh, William Van't Hoff, Stephen B Walsh, Felice D'Arco, Arezoo Daryadel, Soline Bourgeois, Carsten A Wagner, Robert Kleta, Detlef Bockenhauer, John A Sayer
Maintenance of the composition of inner ear fluid and regulation of electrolytes and acid-base homeostasis in the collecting duct system of the kidney require an overlapping set of membrane transport proteins regulated by the forkhead transcription factor FOXI1. In two unrelated consanguineous families, we identified three patients with novel homozygous missense mutations in FOXI1 (p.L146F and p.R213P) predicted to affect the highly conserved DNA binding domain. Patients presented with early-onset sensorineural deafness and distal renal tubular acidosis...
December 14, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/29240444/regio-and-diastereodivergent-4-2-cycloadditions-with-cyclic-2-4-dienones
#3
Wei Xiao, Qian-Qian Yang, Zhi Chen, Qin Ouyang, Wei Du, Ying-Chun Chen
By employing activated alkenes with bulky α-functional groups, such as α-cyano-α,β-unsaturated ketones and Meldrum's acid-based alkenes, a previously unreported cross-trienamine pathway of cyclic 2,4-dienones is adopted to deliver γ',δ-regioselective [4 + 2] cycloadducts catalyzed by cinchona-derived amines. In addition, a diastereodivergent [4 + 2] cycloaddition reaction is realized with Z-configured 4-alkylideneisoxazol-5(4H)-ones under similar catalytic conditions, even through a three- or four-component cascade process with simple starting materials...
December 14, 2017: Organic Letters
https://www.readbyqxmd.com/read/29240289/dnazyme-feedback-amplification-relaying-molecular-recognition-to-exponential-dna-amplification
#4
Meng Liu, Qingxin Yin, Erin McConnell, Yangyang Chang, John Brennan, Yingfu Li
Technologies capable of linking DNA amplification to molecular recognition are very desirable for ultrasensitive biosensing applications. We have developed a simple but powerful isothermal DNA amplification method, termed DNAzyme feedback amplification (DFA), that is capable of relaying molecular recognition to exponential DNA amplification. The method incorporates both an RNA-cleaving DNAzyme (RCD) and rolling circle amplification (RCA) carried out by a special DNA polymerase using a circular DNA template...
December 14, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29237754/the-ins-and-outs-of-acid-base-transport-in-skeletal-muscle
#5
Christian Aalkjær, Ole Bækgaard Nielsen
No abstract text is available yet for this article.
December 13, 2017: Journal of General Physiology
https://www.readbyqxmd.com/read/29233225/photosynthetic-water-splitting-by-the-mn4ca2-ox-catalyst-of-photosystem-ii-its-structure-robustness-and-mechanism
#6
James Barber
The biological energy cycle of our planet is driven by photosynthesis whereby sunlight is absorbed by chlorophyll and other accessory pigments. The excitation energy is then efficiently transferred to a reaction centre where charge separation occurs in a few picoseconds. In the case of photosystem II (PSII), the energy of the charge transfer state is used to split water into oxygen and reducing equivalents. This is accomplished by the relatively low energy content of four photons of visible light. PSII is a large multi-subunit membrane protein complex embedded in the lipid environment of the thylakoid membranes of plants, algae and cyanobacteria...
January 2017: Quarterly Reviews of Biophysics
https://www.readbyqxmd.com/read/29232498/electron-precise-actinide-pnictide-an-pn-bonds-spanning-non-metal-metalloid-and-metal-combinations-an-u-th-pn-p-as-sb-bi
#7
Stephen Liddle, Thomas Rookes, Elizabeth Wildman, Gabor Balazs, Benedict Gardner, Ashley Wooles, Matthew Gregson, Floriana Tuna, Manfred Scheer
We report the synthesis and characterisation of the compounds [An(TrenDMBS){Pn(SiMe3)2}] and [An(TrenTIPS){Pn(SiMe3)2}] [TrenDMBS = N(CH2CH2NSiMe2But)3, An = U, Pn = P, As, Sb, Bi; An = Th, Pn = P, As; TrenTIPS = N(CH2CH2NSiPri3)3, An = U, Pn = P, As, Sb; An = Th, Pn = P, As, Sb]. The U-Sb and Th-Sb moieties are unprecedented examples of any kind of An-Sb molecular bond, and the U-Bi bond is the first electron-precise one. The Th-Bi combination was too unstable to isolate, underscoring the fragility of these linkages...
December 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29232493/-carboxyl-11c-labeling-of-four-high-affinity-cpla2a-inhibitors-and-their-evaluation-as-radioligands-in-mice-with-positron-emission-tomography
#8
Martin J Fisher, Lindsay McMurray, Shuiyu Lu, Cheryl L Morse, Jeih-San Liow, Sami S Zoghbi, Aneta Kowalski, Geroge L Tye, Robert B Innis, Franklin I Aigbirhio, Victor W Pike
Cytosolic phospholipase A2α (cPLA2α) may play a critical role in neuropsychiatric and neurodegenerative disorders associated with oxidative stress and neuroinflammation. An effective PET radioligand for imaging cPLA2α in living brain might prove useful for biomedical research, especially on neuroinflammation. We selected four high-affinity (IC50 2.1 to 12 nM) indole-5-carboxylic acid-based inhibitors of cPLA2α (1-4), for labelling in carboxyl position with carbon-11 (t1/2 = 20.4 min) to provide candidate PET radioligands for imaging brain cPLA2α...
December 12, 2017: ChemMedChem
https://www.readbyqxmd.com/read/29231722/selenium-iv-sorption-onto-%C3%AE-al2o3-a-consistent-description-of-the-surface-speciation-by-spectroscopy-and-thermodynamic-modeling
#9
Natalia Mayordomo, Harald Foerstendorf, Johannes Lutzenkirchen, Karsten Heim, Stephan Weiss, Ursula Alonso, Tiziana Missana, Katja Schmeide, Norbert Jordan
The sorption processes of Se(IV) onto γ-Al2O3 were studied by in situ Infrared spectroscopy, batch sorption studies, zeta potential measurements and Surface Complexation Modeling (SCM) in the pH range from 5 to 10. In situ Attenuated Total Reflection Fourier-transform Infrared (ATR FT-IR) spectroscopy revealed the predominant formation of a single inner-sphere surface species at the alumina surface, supporting previously reported EXAFS results, irrespective of the presence or absence of atmospherically derived carbonate...
December 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29230684/imipenem-relebactam-and-meropenem-vaborbactam-two-novel-carbapenem-%C3%AE-lactamase-inhibitor-combinations
#10
REVIEW
George G Zhanel, Courtney K Lawrence, Heather Adam, Frank Schweizer, Sheryl Zelenitsky, Michael Zhanel, Philippe R S Lagacé-Wiens, Andrew Walkty, Andrew Denisuik, Alyssa Golden, Alfred S Gin, Daryl J Hoban, Joseph P Lynch, James A Karlowsky
Relebactam (formerly known as MK-7655) is a non-β-lactam, bicyclic diazabicyclooctane, β-lactamase inhibitor that is structurally related to avibactam, differing by the addition of a piperidine ring to the 2-position carbonyl group. Vaborbactam (formerly known as RPX7009) is a non-β-lactam, cyclic, boronic acid-based, β-lactamase inhibitor. The structure of vaborbactam is unlike any other currently marketed β-lactamase inhibitor. Both inhibitors display activity against Ambler class A [including extended-spectrum β-lactamases (ESBLs), Klebsiella pneumoniae carbapenemases (KPCs)] and class C β-lactamases (AmpC)...
December 12, 2017: Drugs
https://www.readbyqxmd.com/read/29227274/study-of-pharmacometric-indexes-of-dosing-regimen-of-antihypoxant-okagerm-4
#11
V Lukyanchuk, D Kravets, D Litvinenko
In series of pharmacometrics research by determination of an optimum model of dosing is established that introduction of OKAGERM-4 in a dose of 96.8 mg/kg administered 40 minutes before the start of hypoxic damage realizes in maximum increase of estimated life expectancy of animals in hermetically sealed containers (65.57 min), ensuring a maximum effect of potential pharmacotherapeutic remedy - tartaric acid-based coordination compound of germanium with manganese. Thus, the results of pharmacometric research aimed to develop dosing regimen of OKAGERM-4 may be the base for future episodes of its pre-clinical study...
November 2017: Georgian Medical News
https://www.readbyqxmd.com/read/29224849/aptamers-as-potential-therapeutic-agents-for-ovarian-cancer
#12
REVIEW
Justin Liam Henri, Joanna Macdonald, Mia Strom, Wei Duan, Sarah Shigdar
Current therapy for ovarian cancer typically involves indiscriminate chemotherapies that can have severe off target effects on healthy tissue and are still plagued by aggressive recurrence. Recent shifts towards targeted therapies offer the possibility of circumventing the obstacles experienced by these traditional treatments. While antibodies are the pioneering agents in targeted therapies, clinical experience has demonstrated that their antitumor efficacy is limited due to their high immunogenicity, large molecular size, and costly and laborious production...
December 7, 2017: Biochimie
https://www.readbyqxmd.com/read/29224421/hydrolysis-setting-properties-and-in%C3%A2-vitro-characterization-of-wollastonite-newberyite-bone-cement-mixtures
#13
Tibor Sopcak, Lubomir Medvecky, Maria Giretova, Radoslava Stulajterova, Juraj Durisin
Bone cements based on magnesium phosphates such as newberyite (N; MgHPO4.3H2O) have been shown as potential bone substitutes due to their biocompatibility, biodegradability and ability to support osteoblast differentiation and proliferation. Newberyite can hydrolyze to hydrated magnesium phosphate compounds (e.g. bobierite (Mg3(PO4)2.8H2O)) at alkaline conditions. In this study, 25 and 50 wt% of crystalline β -wollastonite (woll; CaSiO3) was admixed to newberyite powder in order to both enhance the acid-base hydrolysis of newberyite and to produce a functional bone cement...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/29224136/a-summary-of-the-biological-processes-disease-associated-changes-and-clinical-applications-of-dna-methylation
#14
Gitte Brinch Andersen, Jörg Tost
DNA methylation at cytosines followed by guanines, CpGs, forms one of the multiple layers of epigenetic mechanisms controlling and modulating gene expression through chromatin structure. It closely interacts with histone modifications and chromatin remodeling complexes to form the local genomic and higher-order chromatin landscape. DNA methylation is essential for proper mammalian development, crucial for imprinting and plays a role in maintaining genomic stability. DNA methylation patterns are susceptible to change in response to environmental stimuli such as diet or toxins, whereby the epigenome seems to be most vulnerable during early life...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29222545/coefficient-of-friction-between-carboxymethylated-hyaluronic-acid-based-polymer-films-and-the-ocular-surface
#15
Jourdan Colter, Barbara Wirostko, Brittany Coats
Purpose: Hyaluronic acid-based polymer films are emerging as drug-delivery vehicles for local and continuous drug administration to the eye. The highly lubricating hyaluronic acid increases comfort, but displaces films from the eye, reducing drug exposure and efficacy. Previous studies have shown that careful control of the surface interaction of the film with the eye is critical for improved retention. Methods: In this study, the frictional interaction of a carboxymethylated, hyaluronic acid-based polymer (CMHA-S) with and without methylcellulose was quantified against ovine and human sclera at three axial loads (0...
December 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29222395/extracellular-adenosine-stimulates-vacuolar-atpase-dependent-proton-secretion-in-medullary-intercalated-cells
#16
Maria A Battistone, Anil V Nair, Claire R Barton, Rachel N Liberman, Maria A Peralta, Diane E Capen, Dennis Brown, Sylvie Breton
Acidosis is an important complication of AKI and CKD. Renal intercalated cells (ICs) express the proton pumping vacuolar H+-ATPase (V-ATPase) and are extensively involved in acid-base homeostasis. H+ secretion in type A intercalated cells (A-ICs) is regulated by apical vesicle recycling and stimulated by cAMP. In other cell types, cAMP is increased by extracellular agonists, including adenosine, through purinergic receptors. Adenosine is a Food and Drug Administration-approved drug, but very little is known about the effect of adenosine on IC function...
December 8, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/29222087/dose-dependent-relationship-between-acidosis-at-birth-and-likelihood-of-death-or-cerebral-palsy
#17
Rod Kelly, S M Ramaiah, Helen Sheridan, Hilary Cruickshank, Magda Rudnicka, Chris Kissack, Julie-Clare Becher, Ben J Stenson
BACKGROUND: The acid-base status of infants around birth can provide information about their past, current and future condition. Although umbilical cord blood pH <7.0 or base deficit ≥12 mmol/L is associated with increased risk of adverse outcome, there is uncertainty about the prognostic value of degree of acidosis as previous studies have used different variables, thresholds, outcomes and populations. METHODS: Retrospective review of routinely collected clinical data in all live-born inborn infants of 35 weeks gestation or more delivered between January 2005 and December 2013 at the Simpson Centre for Reproductive Health, Edinburgh, UK...
December 8, 2017: Archives of Disease in Childhood. Fetal and Neonatal Edition
https://www.readbyqxmd.com/read/29221987/hierarchical-recognition-of-amino-acid-co-germinants-during-clostridioides-difficile-spore-germination
#18
Ritu Shrestha, Joseph A Sorg
Bile acids are an important signal for germination of Clostridioides difficile spores; however, the bile acid signal alone is not sufficient. Amino acids, such as glycine, are another signal necessary for germination by C. difficile spores. Prior studies on the amino acid signal required for germination have shown that there is a preference for the amino acid used as a signal for germination. Previously we found that d-alanine can function as a co-germinant for C. difficile spores at 37 °C but not at 25 °C...
December 5, 2017: Anaerobe
https://www.readbyqxmd.com/read/29221914/microalgae-as-feedstock-for-biodiesel-production-under-ultrasound-treatment-a-review
#19
REVIEW
Ramachandran Sivaramakrishnan, Aran Incharoensakdi
The application of ultrasound in biodiesel production has recently emerged as a novel technology. Ultrasound treatment enhances the mass transfer characteristics leading to the increased reaction rate with short reaction time and potentially reduces the production cost. In this review, application of ultrasound-assisted biodiesel production using acid, base and enzyme catalysts is presented. A critical assessment of the current status of ultrasound in biodiesel production was discussed with the emphasis on using ultrasound for efficient microalgae biodiesel production...
November 29, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29221627/alkaline-diet-and-metabolic-acidosis-practical-approaches-to-the-nutritional-management-of-chronic-kidney-disease
#20
Larissa Rodrigues Neto Angéloco, Gabriela Cristina Arces de Souza, Elen Almeida Romão, Paula Garcia Chiarello
The kidneys play an extremely important role in maintaining the body acid-base balance by excreting nonvolatile acids and regenerating and reabsorbing bicarbonate in the kidney tubules. As the individual loses their kidney function, renal excretion of nonvolatile acid produced by metabolism of the diet is impaired, resulting in low-grade metabolic acidosis. With this in mind, it is relevant to better understand the dietary aspects related to the acid-base balance in chronic kidney disease metabolic acidosis and try to provide possible strategies for the nutritional management of these cases...
December 5, 2017: Journal of Renal Nutrition
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