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https://www.readbyqxmd.com/read/28545253/encapsulation-of-the-antioxidant-r-%C3%AE-lipoic-acid-in-permethylated-%C3%AE-and-%C3%AE-cyclodextrins-thermal-and-x-ray-structural-characterization-of-the-1-1-inclusion-complexes
#1
Mino R Caira, Susan A Bourne, Buntubonke Mzondo
The naturally occurring compound α-lipoic acid (ALA) is implicated in manifold critical biological roles and its potent antioxidant properties and potential for treatment of various diseases have led to its widespread use as a dietary supplement. However, shortcomings of poor aqueous solubility and low thermal stability have hampered its development as a medicinal agent, prompting the use of cyclodextrins (CDs) to address these problems. The paucity of published structural data on the nature of the interactions between ALA and CDs motivated the present study, which describes the synthesis and X-ray structural elucidation of crystalline inclusion complexes between the biologically relevant R-(+)-α-lipoic acid (RALA) and the host molecules permethylated α-CD (TMA) and permethylated β-CD (TMB)...
May 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28545193/synthesis-characterization-and-cytotoxic-evaluation-of-graphene-oxide-nanosheets-in-vitro-liver-cancer-model
#2
Samah A Loutfy, Taher A Salaheldin, Marwa A Ramadan, Khaled Yehia Farroh, Zeinab F Abdallah, Tareq Youssef Abd Eloahed
Background: Graphene nanosheets have a broad spectrum of biomedical applications. Hepatocellular cancer (HCC) is a major health problem in the Egyptian population. Currently, treatment strategies are invasive and have several adverse side effects. Thus, other approaches are required for managing this aggressive type of cancer. Our objective here was to prepare and characterize graphene oxide nanosheets and evaluate cytotoxic effect at the molecular level in an in vitro human liver cancer cell model (HepG2)...
April 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28545054/an-optimized-small-animal-tumour-model-for-experimentation-with-low-energy-protons
#3
Elke Beyreuther, Kerstin Brüchner, Mechthild Krause, Margret Schmidt, Rita Szabo, Jörg Pawelke
BACKGROUND: The long-term aim of developing laser based particle acceleration towards clinical application requires not only substantial technological progress, but also the radiobiological characterization of the resulting ultra-short and ultra-intensive particle beam pulses. After comprehensive cell studies a mouse ear tumour model was established allowing for the penetration of low energy protons (~20 MeV) currently available at laser driven accelerators. The model was successfully applied for a first tumour growth delay study with laser driven electrons, whereby the need of improvements crop out...
2017: PloS One
https://www.readbyqxmd.com/read/28544959/effect-of-different-mineralization-processes-on-in-vitro-and-in-vivo-bone-regeneration-and-osteoblast-macrophage-cross-talk-in-co-culture-system-using-dual-growth-factor-mediated-non-mulberry-silk-fibroin-grafted-poly-%C3%B0-caprolactone-nanofibrous-scaffold
#4
Promita Bhattacharjee, Tapas K Maiti, Debasis Bhattacharya, Samit Kumar Nandi
This study evaluates mineralized nanofibrous polymeric scaffolds at supporting in vitro osteogenic differentiation of human mesenchymal stem cells (hMSCs) and in vivo bone tissue regeneration. Co-electrospin, alternative soaking, and electrodeposition were used to introduce hydroxyapatite in non-mulberry silk fibroin grafted poly(Є-caprolactone) nanofibrous scaffolds. Bone morphogenic protein-2 and Transforming growth factor-β, at a potency ratio of 1:1, are covalently coupled onto the scaffolds. hMSCs proliferation and interactions are studied through MTT and Alamar blue assay and scanning electron and confocal microscopy...
May 16, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28544565/base-selective-five-versus-six-membered-ring-annulation-in-palladium-catalyzed-c-c-coupling-cascade-reactions-new-access-to-electron-poor-polycyclic-aromatic-dicarboximides
#5
Sabine Seifert, David Schmidt, Kazutaka Shoyama, Frank Würthner
Palladium-catalyzed base-selective annulation of dibromonaphthalimide to different aryl boronate esters by combined Suzuki-Miyaura cross-coupling and direct C-H arylation afforded a series of new five- and six-membered ring annulated electron-poor polycyclic aromatic hydrocarbons. Cesium carbonate (Cs2 CO3 ) as auxiliary base in these C-C coupling cascade reactions led exclusively to six-membered ring annulation, while the use of organic base diazabicycloundecene (DBU) afforded the corresponding five-membered ring annulated products...
May 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28544036/stereospecific-winding-of-polycyclic-aromatic-hydrocarbons-into-trinacria-propellers
#6
Dario Mosca, Antoine Stopin, Nicola Demitri, Johan Wouters, Davide Bonifazi
The stereospecific trimerization of enantiomerically-pure binaphthols with hexakis(bromomethyl)benzene gives access in one step to enantiomerically-pure molecular propellers, in which three binaphthyl rings are held together through dioxecine rings. X-Ray diffraction analysis revealed that three out the six naphthyl moieties are folded in a (EF)3-type arrangement held by three intramolecular C-H…π interactions. This slips outward the three remaining naphthyl rings in a blade-like fashion, just like in three-folded propeller components...
May 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28542531/new-diagnostic-index-for-sarcopenia-in-patients-with-cardiovascular-diseases
#7
Haruhito Harada, Hisashi Kai, Rei Shibata, Hiroshi Niiyama, Yasuhiro Nishiyama, Toyoaki Murohara, Noriko Yoshida, Atsushi Katoh, Hisao Ikeda
BACKGROUND: Sarcopenia is an aging and disease-related syndrome characterized by progressive and generalized loss of skeletal muscle mass and strength, with the risk of frailty and poor quality of life. Sarcopenia is diagnosed by a decrease in skeletal muscle index (SMI) and reduction of either handgrip strength or gait speed. However, measurement of SMI is difficult for general physicians because it requires special equipment for bioelectrical impedance assay or dual-energy X-ray absorptiometry...
2017: PloS One
https://www.readbyqxmd.com/read/28542288/structural-models-of-the-different-trimers-present-in-the-core-of-phycobilisomes-from-gracilaria-chilensis-based-on-crystal-structures-and-sequences
#8
Jorge Dagnino-Leone, Maximiliano Figueroa, Claudia Mella, María Alejandra Vorphal, Frédéric Kerff, Aleikar José Vásquez, Marta Bunster, José Martínez-Oyanedel
Phycobilisomes (PBS) are accessory light harvesting protein complexes that directionally transfer energy towards photosystems. Phycobilisomes are organized in a central core and rods radiating from it. Components of phycobilisomes in Gracilaria chilensis (Gch) are Phycobiliproteins (PBPs), Phycoerythrin (PE), and Phycocyanin (PC) in the rods, while Allophycocyanin (APC) is found in the core, and linker proteins (L). The function of such complexes depends on the structure of each component and their interaction...
2017: PloS One
https://www.readbyqxmd.com/read/28542100/global-spinal-alignment-in-patients-with-cervical-spondylotic-myelopathy
#9
Go Yoshida, Abdulmajeed Alzakri, Vincent Pointillart, Louis Boissiere, Ibrahim Obeid, Yukihiro Matsuyama, Jean Marc Vital, Olivier Gille
STUDY DESIGN: Prospective radiographic analysis of cervical spondylotic myelopathy (CSM) OBJECTIVE.: To clarify the pathophysiology of CSM, and use the characteristic of global spinal alignment for determining the surgical strategy. SUMMARY OF BACKGROUND DATA: Radiographic evaluation of CSM, in general, comprises cervical magnetic resonance imaging (MRI) and regional cervical radiography, which cannot distinguish between cervical hyperlodorsis with spinopelvic compensation and cervical lordorsis with normal global alignment...
May 24, 2017: Spine
https://www.readbyqxmd.com/read/28541952/synthesis-and-application-of-a-ternary-composite-of-clay-saw-dust-and-peanut-husks-in-heavy-metal-adsorption
#10
Henry H Mungondori, Sandile Mtetwa, Lilian Tichagwa, David M Katwire, Pardon Nyamukamba
The adsorption of a multi-component system of ferrous, chromium, copper, nickel and lead on single, binary and ternary composites was studied. The aim of the study was to investigate whether a ternary composite of clay, peanut husks (PH) and saw-dust (SD) exhibited a higher adsorption capacity than that of a binary system of clay and SD as well as a single component adsorbent of PH alone. The materials were used in their raw state without any chemical modifications. This was done to retain the cost effective aspect of the naturally occurring adsorbents...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28541948/attached-%C3%AE-cyclodextrin-%C3%AE-2-3-epoxypropoxy-propyl-trimethoxysilane-to-graphene-oxide-and-its-application-in-copper-removal
#11
Zongxue Yu, Qi Chen, Liang Lv, Yang Pan, Guangyong Zeng, Yi He
The environmental applications of graphene oxide and β-cyclodextrin (β-CD) have attracted great attention since their first discovery. Novel nanocomposites were successfully prepared by using an esterification reaction between β-cyclodextrin/γ-(2,3-epoxypropoxy) propyl trimethoxysilane grafted graphene oxide (β-CD/GPTMS/GO). The β-CD/GPTMS/GO nanocomposites were used to remove the Cu(2+) from aqueous solutions. The characteristics of β-CD/GPTMS/GO were detected by scanning electron microscopy (SEM), Fourier transform infrared, X-ray diffraction (XRD), thermogravimetric analysis (TG) and energy dispersive X-ray (EDX)...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28541945/application-of-scallop-shell-fe3o4-nanoparticles-for-the-removal-of-cr-vi-from-aqueous-solutions
#12
Azita Mohagheghian, Robabeh Vahidi-Kolur, Melina Pourmohseni, Jae-Kyu Yang, Mehdi Shirzad-Siboni
In this study, removal of Cr(VI) by Scallop shell-Fe3O4 nanoparticles was investigated with variation of pH, adsorbent dosage, initial Cr(VI) concentration, ionic strength and temperature. Coating of Fe3O4 nanoparticles onto Scallop shell was identified by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The maximum adsorption was observed at pH 3. Removal efficiency of Cr(VI) was increased with increasing adsorbent dosage, but was decreased with increasing initial Cr(VI) concentration and temperature...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28541719/the-studies-of-archaeological-pottery-with-the-use-of-selected-analytical-techniques
#13
Joanna Kałużna-Czaplińska, Angelina Rosiak, Jacek Grams, Karolina Chałupka, Przemysław Makarowicz, Waldemar Maniukiewicz, Elżbieta Szubiakiewicz
Modern analytical methods play an important role in archaeological objects, including ceramics. This review focuses on the use of analytical methods such as: gas chromatography coupled mass spectrometry (GC/MS), Fourier transform infrared spectroscopy (FTIR), Time-of-flight secondary ion mass spectrometry (ToF-SIMS), Powder X-ray diffraction (XRD) with thermal analysis (TGA-MS) to study the chemical and mineralogical composition of archaeological samples and organic residues preserved inside. In this paper, special attention was paid to the ToF-SIMS method, which allows the determination of characteristic ions on the surface of ceramic samples...
May 25, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28541690/bioactive-glycosides-from-the-twigs-of-litsea-cubeba
#14
Ling-Yan Wang, Ming-Hua Chen, Jiang Wu, Hua Sun, Wei Liu, Yu-Hong Qu, Yan-Cheng Li, Yu-Zhuo Wu, Rui Li, Dan Zhang, Su-Juan Wang, Sheng Lin
The air-dried twigs of Litsea cubeba, a traditional Chinese medicinal tree, afforded 10 new aromatic glycosides (1-10) and 26 known analogues. Their structures were assigned by extensive 1D and 2D NMR experiments, and the absolute configurations were resolved by chemical methods, electronic circular dichroism, specific rotation, and X-ray crystallographic analysis. Compound 4 is the first example of a naturally occurring homoneolignan glucoside. Compounds 4, 6-8, and the known neolignan glucosides (11, 12, and 14) at respective 10 μM concentrations were found to reduce acetaminophen-induced HepG2 cell injury with 30...
May 25, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28541683/triol-ligand-modification-and-structural-transformation-of-anderson-evans-oxomolybdates-via-modulating-oxidation-state-of-co-heteroatom
#15
Yang Wang, Xiaoting Liu, Wei Xu, Ying Yue, Bao Li, Lixin Wu
Various covalent decorations and structural transformations of a series of R-C(CH2OH)3 triol ligands on Co(II)/Co(III)-centered Anderson-Evans polyoxomolybdates were studied in aqueous and/or organic solution. Single-crystal X-ray structural analysis demonstrated that four manners, including (1) double-sided χ/χ-isomer and (2) double-sided δ/χ-isomer with Co(II) central heteroatom, and (3) single-sided δ-isomer and (4) double-sided δ/δ-isomer with Co(III) central heteroatom, appeared on the decoration of the mother polyanion [Co(II/III)(OH)6Mo6O18](4-/3-)...
May 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28541592/cath-lab-costs-in-patients-undergoing-percutaneous-coronary-angioplasty-detailed-analysis-of-consecutive-procedures
#16
Beata Dziki, Izabela Miechowicz, Piotr Iwachów, Michał Kuzemczak, Piotr Kałmucki, Andrzej Szyszka, Artur Baszko, Tomasz Siminiak
BACKGROUND: Costs of percutaneous coronary interventions (PCI) have important impact on health care expenditures. Despite the present stress upon the cost-effectiveness issues in medicine, few comprehensive data exist on costs and resource use in different clinical settings. AIM: To assess catheterization laboratory costs related to use of drugs and single-use devices in patients undergoing PCI due to coronary artery disease. METHODS: Retrospective analysis of 1500 consecutive PCIs (radial approach, n=1103; femoral approach, n=397) performed due to myocardial infarction type STEMI (n=345) and NSTEMI (n=426) as well as unstable (UA; n=489) and (SA; n=241) angina was undertaken...
May 25, 2017: Kardiologia Polska
https://www.readbyqxmd.com/read/28541532/constitutive-activation-of-akt2-in-humans-leads-to-hypoglycemia-without-fatty-liver-or-metabolic-dyslipidemia
#17
Marina Minic, Nuno Rocha, Julie Harris, Matthijs P Groeneveld, Sarah Leiter, Nicholas Wareham, Alison Sleigh, Pascale De Lonlay, Khalid Hussain, Stephen O'Rahilly, Robert K Semple
Context: The activating p.Glu17Lys mutation in AKT2, a kinase mediating many of insulin's metabolic actions, causes hypoinsulinemic hypoglycemia and left-sided hemihypertrophy. The wider metabolic profile and longer term natural history of the condition has not yet been reported. Objective: To characterise the metabolic and cellular consequences of the AKT2 p.Glu17Lys mutation in two previously reported males at the age of 17 years. Design/intervention: Body composition analysis using dual energy X ray absorptiometry, overnight profiling of plasma glucose, insulin and fatty acids, oral glucose tolerance testing, and magnetic resonance spectroscopy to determine hepatic triglyceride content were undertaken...
May 23, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28541125/electrically-conductive-borate-based-bioactive-glass-scaffolds-for-bone-tissue-engineering-applications
#18
Mert Turk, Aylin M Deliormanlı
In this study, electrically conductive, borate-based, porous 13-93B3 bioactive glass composite scaffolds were prepared using a polymer foam replication technique. For this purpose, a slurry containing 40 vol% glass particles and 0-10 wt% graphene nanoplatelets was prepared by dispersing the particles in ethanol in the presence of ethyl cellulose. Composite scaffolds were subjected to a controlled heat treatment, in air atmosphere, to decompose the foam and sinter the glass particles into a dense network...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28541048/monoanionic-bis-pyrazolyl-methylborate-ph3b-ch-3-5-ch3-2pz-2-as-a-supporting-ligand-for-copper-i-ethylene-cis-2-butene-and-carbonyl-complexes
#19
Shawn G Ridlen, Naveen V Kulkarni, H V Rasika Dias
The monoanionic bidentate ligand [(Ph3B)CH(3,5-(CH3)2Pz)2)](-) has been prepared from lithium bis(pyrazolyl)methanide and triphenylborane. This useful new ligand is closely related to the well-established bis(pyrazolyl)borate and bis(pyrazolyl)methane ligands but has key differences to both analogues as well. The ethylene, cis-2-butene, and carbon monoxide adducts [(Ph3B)CH(3,5-(CH3)2Pz)2]Cu(L) (where L = C2H4, cis-CH3HC═CHCH3, and CO) have been prepared from [(Ph3B)CH(3,5-(CH3)2Pz)2)]Li(THF), copper(I) triflate, and the corresponding coligand...
May 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28540953/a-novel-anion-doping-strategy-to-enhance-upconversion-luminescence-in-nagd-moo4-2-yb-3-er-3-nanophosphors
#20
Anming Li, Dekang Xu, Hao Lin, Lu Yao, Shenghong Yang, Yuanzhi Shao, Yueli Zhang, Zhenqiang Chen
We propose a novel and efficient F(-) anion doping strategy for enhancing upconversion luminescence in upconversion nanophosphors. NaGd(MoO4)2:Yb(3+)/Er(3+) nanophosphors doped with different F(-) contents are synthesized hydrothermally. Rietveld refinement results obtained from X-ray diffraction data indicate that the Gd-O bond length decreases and the O-Gd-O bond angle varies with increasing F(-) content, resulting in augmented local crystal field strength and distorted local site symmetry of the dopant lanthanide sites...
May 25, 2017: Physical Chemistry Chemical Physics: PCCP
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