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https://www.readbyqxmd.com/read/29778445/calixarene-immobilized-monolithic-cryogels-for-preparative-protein-chromatography
#1
Idris Guven, Orhan Gezici, Mevlut Bayrakci, Massimo Morbidelli
New cation exchanger monolithic stationary phases were prepared by immobilization of three different calixarene derivatives (i.e. tetracarboxylate calix[4]arene, CLX-COO, tetrasulfonate calix[4]arene, CLX-SO3 , and tetraphosphonate calix[4]arene, CLX-PO4 ) onto a monolithic cryogel support (i.e. poly(2-hydroksyethylmethacrilate-co-glycidyl methacrylate, P) and investigated with respect to preparative protein chromatography. The obtained monoliths were characterized through various techniques such as FTIR spectroscopy, isoelectric point measurements, titrimetric analyses, and mercury intrusion porosimetry...
May 16, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29714815/b-heterocyclic-carbene-arising-from-charge-shift-a-computational-verification
#2
Congjie Zhang, Fan Fan, Zhimin Wang, Jinshuai Song, Chunsen Li, Yirong Mo
1-Borabicyclo(1.1.0)but-2(3)-ene (1BB) is a singlet biradical with two single electrons which can form an ionic resonance structure via charge-shift. The ionic resonance structure is a B-heterocyclic carbene (BHC) which can act as carbene, Lewis base, L- and Z-type ligands to give adducts and complexes. Using a range of quantum methods, we designed four types of stable compounds (A-D) derived from 1BB. These compounds retain the unique features of 1BB. As a consequence, we investigated the structures, stability and Wiberg bond orders (WBIs) of the Lewis adducts of A-D with Lewis acids (BePh₂, BH₃, AlH₃, AlCl₃, C₅BH₅ and C₁₃BH₉), as well as the Cu(I), Ag(I) and Au(I) complexes...
May 1, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29651970/randomized-double-blind-placebo-controlled-trial-of-celecoxib-for-prevention-of-skin-toxicity-in-patients-receiving-radiation-therapy-for-breast-cancer
#3
Arash Ghasemi, Behzad Danesh, Jamshid Yazdani, Seyed Jalal Hosseinimehr
BACKGROUND: The skin toxicity-induced by ionizing radiation may limit the duration of treatment and may lead discomfort to quality life of patients during radiotherapy. OBJECTIVE: The purpose of this randomized, placebo-controlled, double-blind study was to investigate the preventive effect of oral administration of celecoxib (CLX) on the acute radiation-induced skin toxicity in patients with breast cancer. METHODS: Sixty breast cancer patients were randomly assigned to use CLX (400 mg per day) or placebo capsules during radiotherapy...
April 11, 2018: Anti-inflammatory & Anti-allergy Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/29651564/impedance-analysis-of-thin-films-of-organic-inorganic-perovskites-ch-3-nh-3-pbi-3-with-control-of-microstructure
#4
Oleg V'yunov, Anatolii Belous, Sofiia Kobylianska, Leonid Kovalenko
The effect of starting reagents (PbI2:{CH3 NH3 I + CH3 NH3 Cl}) with different ratios in raw solutions on the microstructure of films of organic-inorganic perovskites CH3 NH3 PbI3-x Clx , as well as on the electrical properties, has been investigated. It was found that the crystallinity is increased sharply when the ratio of the starting reagents increases from 1:1 to 1:2 and is changed slightly with a further increase of ratio to 1:3. It is shown that when the ratio of starting reagents varies, the morphology of the films changes; at a ratio of 1:1, the films consist of needle-like particles, and when the ratio is increased, particles become roundish and then faceted...
April 12, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29554741/elimination-of-isoxazolyl-penicillins-antibiotics-in-waters-by-the-ligninolytic-native-colombian-strain-leptosphaerulina-sp-considerations-on-biodegradation-process-and-antimicrobial-activity-removal
#5
Ledys S Copete-Pertuz, Jersson Plácido, Efraím A Serna-Galvis, Ricardo A Torres-Palma, Amanda Mora
In this work, Leptosphaerulina sp. (a Colombian native fungus) significantly removed three Isoxazolyl-Penicillin antibiotics (IP): oxacillin (OXA, 16000 μg L-1 ), cloxacillin (CLX, 17500 μg L-1 ) and dicloxacillin (DCX, 19000 μg L-1 ) from water. The biological treatment was performed at pH 5.6, 28 °C, and 160 rpm for 15 days. The biotransformation process and lack of toxicity of the final solutions (antibacterial activity (AA) and cytotoxicity) were tested. The role of enzymes in IP removal was analysed through in vitro studies with enzymatic extracts (crude and pre-purified) from Leptosphaerulina sp...
July 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29550713/select-antibiotics-in-leachate-from-closed-and-active-landfills-exceed-thresholds-for-antibiotic-resistance-development
#6
S S Chung, J S Zheng, S R Burket, B W Brooks
Though antibiotic resistance (ABR) represents a major global health threat, contributions of landfill leachate to the life cycle of antibiotics and ABR development are poorly understood in rapidly urbanizing regions of developing countries. We selected one of the largest active landfills in Asia and two landfills that have been closed for 20 years to examine antibiotic occurrences in leachates and associated hazards during wet and dry season sampling events. We focused on some of the most commonly used human antibiotics in Hong Kong, one of the most populous Asian cities and the fourth most densely populated cities in the world...
March 15, 2018: Environment International
https://www.readbyqxmd.com/read/29434827/anti-inflammatory-drug-resistance-selects-putative-cancer-stem-cells-in-a-cellular-model-for-genetically-predisposed-colon-cancer
#7
Nitin Telang
Mutations in the adenomatous polyposis coli (Apc) tumor suppressor gene represent the primary genetic defect in colon carcinogenesis. Apc+/- mouse models exhibit pre-invasive small intestinal adenomas. Cell culture models exhibiting Apc defects in the colon and quantifiable cancer risk provide a novel clinically relevant approach. The tumor-derived Apc-/- colonic epithelial cell line 1638N COL-Pr1 represented the experimental model. The anti-inflammatory drugs sulindac (SUL) and celecoxib (CLX) represented the test compounds...
January 2018: Oncology Letters
https://www.readbyqxmd.com/read/29371019/stable-and-sustained-release-liposomal-formulations-of-celecoxib-in-vitro-and-in-vivo-anti-tumor-evaluation
#8
M Matbou Riahi, A Sahebkar, K Sadri, S Nikoofal-Sahlabadi, M R Jaafari
Celecoxib (CLX) is a selective COX-2 inhibitor with anticancer potential in a COX-2 dependent and independent manner. CLX's low water solubility has a dose limiting effect on its utilization in cancer treatment. Here, we developed liposomal drug delivery systems to allow a systemic administration and increase tumor accumulation of CLX based on the enhanced permeability and retention (EPR) mechanism. Nine liposomal formulations has been prepared with different phospholipid compositions; among them three sets of liposomal formulations were selected based on characterization and stability for further studies...
April 5, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29279805/a-low-cost-technique-for-intraoperative-imaging-of-cell-delivery-and-retention-in-a-model-of-delayed-wound-healing
#9
Anthony J Burand, Lauren Boland, Alex J Brown, James A Ankrum
Objective: Techniques to validate successful delivery of cell products are expensive, time-consuming, and require transport of the animal to imaging facilities, preventing their widespread use as documentation tools. The goal of this study was to determine if a low-cost portable microscope could provide sufficient performance to be used to document delivery of cell products and track retention over time. Approach: A Dino-Lite fluorescence microscope and an Odyssey CLx whole-animal scanner were compared on the basis of resolution, sensitivity, and linearity...
December 1, 2017: Advances in Wound Care
https://www.readbyqxmd.com/read/29218846/revealing-the-chemistry-between-band-gap-and-binding-energy-for-lead-tin-based-trihalide-perovskite-solar-cell-semiconductors
#10
Arpita Varadwaj, Pradeep R Varadwaj, Koichi Yamashita
A relationship between reported experimental band gaps (solid) and DFT-calculated binding energies (gas) is established, for the first time, for each of the four ten-membered lead (or tin) trihalide perovskite solar cell semiconductor series examined in this study, including CH3 NH3 PbY3 , CsPbY3 , CH3 NH3 SnY3 and CsSnY3 (Y=I(3-x) Brx=1-3 , I(3-x) Clx=1-3 , Br(3-x) Clx=1-3 , and IBrCl). The relationship unequivocally provides a new dimension for the fundamental understanding of the optoelectronic features of solid-state solar cell thin films by using the 0 K gas-phase energetics of the corresponding molecular building blocks...
January 23, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29102774/boesenbergia-rotunda-l-mansf-extract-potentiates-the-antibacterial-activity-of-some-%C3%AE-lactams-against-%C3%AE-lactam-resistant-staphylococci
#11
Yothin Teethaisong, Thippawan Pimchan, Rungrudee Srisawat, Glyn Hobbs, Griangsak Eumkeb
OBJECTIVES: The purpose of this study was to investigate the effect of Boesenbergia rotunda (L.) Mansf. extract (BRE) and peptidoglycan inhibitor antibiotics, alone and in combination, against β-lactam-resistant staphylococci. METHODS: Antibacterial and synergistic activities of BRE alone and in combination with ampicillin (AMP), cloxacillin (CLX), cefazolin (CZO) or vancomycin (VAN) were evaluated against two β-lactam-resistant Staphylococcus aureus (BRSA) isolates and one β-lactam-resistant Staphylococcus epidermidis (BRSE) isolate...
March 2018: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29055279/a-molecularly-imprinted-dual-emission-carbon-dot-quantum-dot-mesoporous-hybrid-for-ratiometric-determination-of-anti-inflammatory-drug-celecoxib
#12
Mohammad Amjadi, Roghayeh Jalili
We report on a ratiometric fluorescent sensor based on dual-emission molecularly imprinted mesoporous silica embedded with carbon dots and CdTe quantum dots (mMIP@CDs/QDs) for celecoxib (CLX) as target molecule. The fluorescence of the embedded CDs is insensitive to the analyte while the green emissive QDs are selectively quenched by it. This effect is much stronger for the MIP than for the non-imprinted polymer, which indicates a good recognition ability of the mesoporous MIP. The hybrid sensor also exhibited good selectivity to CLX over other substances...
February 15, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28949073/an-efficient-method-for-the-synthesis-of-boratrane-complexes-of-late-transition-metals
#13
Koushik Saha, Rongala Ramalakshmi, Rosmita Borthakur, Suman Gomosta, Kriti Pathak, Vincent Dorcet, Thierry Roisnel, Jean-François Halet, Sundargopal Ghosh
In a quest for efficient precursors for the synthesis of boratrane complexes of late transition metals, we have developed a useful synthetic method using [L'M(μ-Cl)Clx ]2 as precursors (L'=η6 -p-cymene, M=Ru, x=1; L'=COD, M=Rh, x=0 and L'=Cp*, M=Ir or Rh, x=1; COD=1,5-cyclooctadiene, Cp*=η5 -C5 Me5 ). For example, treatment of Na[(H3 B)bbza] or Na[(H2 B)mp2 ] (bbza=bis(benzothiazol-2-yl)amine; mp=2-mercaptopyridyl) with [L'M(μ-Cl)Clx ]2 yielded [(η6 -p-cymene)RuBH{(NCSC6 H4 )(NR)}2 ] (2; R=NCSC6 H4 ), [{N(NCSC6 H4 )2 }RhBH{(NCSC6 H4 )(NR)}2 ] (3; R=NCS-C6 H4 ), [(η6 -p-cymene)RuBH(L)2 ] (5; L=C5 H4 NS), and [Cp*MBH(L)2 ] (6 and 7; L=C5 H4 NS, M=Ir or Rh)...
December 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28945946/real-time-observation-of-iodide-ion-migration-in-methylammonium-lead-halide-perovskites
#14
Cheng Li, Antonio Guerrero, Yu Zhong, Anna Gräser, Carlos Andres Melo Luna, Jürgen Köhler, Juan Bisquert, Richard Hildner, Sven Huettner
Organic-inorganic metal halide perovskites (e.g., CH3 NH3 PbI3-x Clx ) emerge as a promising optoelectronic material. However, the Shockley-Queisser limit for the power conversion efficiency (PCE) of perovskite-based photovoltaic devices is still not reached. Nonradiative recombination pathways may play a significant role and appear as photoluminescence (PL) inactive (or dark) areas on perovskite films. Although these observations are related to the presence of ions/defects, the underlying fundamental physics and detailed microscopic processes, concerning trap/defect status, ion migration, etc...
September 25, 2017: Small
https://www.readbyqxmd.com/read/28810757/encapsulation-of-epitaxial-silicene-on-zrb2-with-nacl
#15
F B Wiggers, Y Yamada-Takamura, A Y Kovalgin, M P de Jong
Silicene and other two-dimensional materials, such as germanene and stanene, have chemically reactive surfaces and are prone to oxidation in air, and thus require an encapsulation layer for ex situ studies or integration in an electronic device. In this work, we investigated NaCl as an encapsulation material for silicene. NaCl was deposited on the surface of epitaxial silicene on ZrB2(0001) thin films near room temperature and studied using synchrotron-based high-resolution photoelectron spectroscopy. The deposition of NaCl resulted in dissociative chemisorption, where the majority of epitaxial silicene reacted to form Si-Clx species...
August 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28801601/spray-cast-multilayer-perovskite-solar-cells-with-an-active-area-of-1-5%C3%A2-cm-2
#16
James E Bishop, David K Mohamad, Michael Wong-Stringer, Alex Smith, David G Lidzey
We utilise spray-coating under ambient conditions to sequentially deposit compact-TiO2, mesoporous-TiO2, CH3NH3PbI(3-x)Clx perovskite and doped spiro-OMeTAD layers, creating a mesoporous standard architecture perovskite solar cell (PSC). The devices created had an average power conversion efficiency (PCE) of 9.2% and a peak PCE of 10.2%; values that compare favourably with control-devices fabricated by spin-casting that had an average efficiency of 11.4%. We show that our process can be used to create devices having an active-area of 1...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28761323/the-comparative-safety-of-genipin-versus-uva-riboflavin-crosslinking-of-rabbit-corneas
#17
Wenjing Song, Yun Tang, Jing Qiao, Haili Li, Bei Rong, Songlin Yang, Yuan Wu, Xiaoming Yan
PURPOSE: To investigate, after 24 h, the safety of genipin or ultraviolet A (UVA)-riboflavin crosslinking of keratocytes and endothelial cells. METHODS: Fifteen New Zealand white rabbits were selected and divided into a PBS group (five rabbits), a 0.2% genipin crosslinking (GP-CXL) group (five rabbits), and a UVA-riboflavin crosslinking (UVA-CXL) group (five rabbits). In the GP-CXL and PBS groups, 0.2% genipin or PBS was applied to the corneal surface of the right eyes...
2017: Molecular Vision
https://www.readbyqxmd.com/read/28544387/modified-tetrathiafulvalene-as-an-organic-conductor-for-improving-performances-of-li-o2-batteries
#18
Jinqiang Zhang, Bing Sun, Yufei Zhao, Katja Kretschmer, Guoxiu Wang
Large over-potentials owing to the sluggish kinetics of battery reactions have always been the drawbacks of Li-O2 batteries, which lead to short cycle life. Although redox mediators have been intensively investigated to overcome this issue, side-reactions are generally induced by the solvated nature of redox mediators. Herein, we report an alternative method to achieve more efficient utilization of tetrathiafulvalene (TTF) in Li-O2 batteries. By coordinating TTF(+) with LiCl during charging, an organic conductor TTF(+) Clx(-) precipitate covers Li2 O2 to provide an additional electron-transfer pathway on the surface, which can significantly reduce the charge over-potential, improve the energy efficiency of Li-O2 batteries, and eliminate side-reactions between the lithium metal anode and TTF(+) ...
May 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28461739/efficacy-of-transepithelial-corneal-collagen-crosslinking-for-keratoconus-12-month-follow-up
#19
Mohamed A Heikal, Tarek Tawfik Soliman, Ayser Fayed, Abdelmonem M Hamed
PURPOSE: To evaluate the efficacy of transepithelial corneal collagen crosslinking (TE-CXL) in patients with progressive keratoconus. PATIENTS AND METHODS: This is a prospective interventional consecutive study carried out on 30 eyes of 18 patients with progressive keratoconus who underwent TE-CLX using both ParaCel™ (riboflavin 0.25%, hydroxy propyl methyl cellulose, NaCl, ethylenediaminetetraacetic acid [EDTA], Tris, and benzalkonium chloride) and vibeX-Xtra (riboflavin 0...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28452780/removal-of-micropollutants-from-municipal-wastewater-by-graphene-adsorption-and-simultaneous-electrocoagulation-electrofiltration-process
#20
Gordon C C Yang, Pei-Ling Tang, Chia-Heng Yen
In this work the optimal operating conditions for removing selected micropollutants (also known as emerging contaminants, ECs) from actual municipal wastewater by graphene adsorption (GA) and simultaneous electrocoagulation/electrofiltration (EC/EF) process, respectively, were first determined and evaluated. Then, performance and mechanisms for the removal of selected phthalates and pharmaceuticals from municipal wastewater simultaneously by the GA and EC/EF process were further assessed. ECs of concern included di-n-butyl phthalate (DnBP), di-(2-ethylhexyl) phthalate (DEHP), acetaminophen (ACE), caffeine (CAF), cefalexin (CLX) and sulfamethoxazole (SMX)...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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