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https://www.readbyqxmd.com/read/28817771/ice-templated-and-cross-linked-amyloid-fibril-aerogel-scaffolds-for-cell-growth
#1
Gustav Nyström, Wye-Khay Fong, Raffaele Mezzenga
Amyloid fibrils prepared from β-lactoglobulin were used to form freeze-dried and cross-linked aerogels. By varying the fibril concentration and freezing gradient, it was possible to control the pore structure and elastic modulus of the aerogels over one order of magnitude from ~2 to ~200 kPa. Using butane tetracarboxylic acid as cross-linker these aerogels maintained their monolithic shape in aqueous conditions displaying elastic behavior and a modulus in the range of 4-40 kPa. When explored as scaffolds for cell growth, the amyloid fibril aerogels demonstrated biocompatibility and led to the successful penetration and permeation of two epithelial cell lines (Caco-2 and HT29) throughout the scaffold...
August 17, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28817768/metal-free-synthesis-of-homopropargylic-alcohols-from-aldehydes
#2
Bruno V M Teodoro, Luiz F Silva
The synthesis of homopropargylic alcohols under metal-free and mild condition is described. This transformation is based on a one-pot procedure involving sequential α-alkynylation of acyclic aldehydes using hypervalent iodine reagents and borohydride reduction. The chemistry exhibit broad substrate scope and good scalability, providing a convenient route for the α-alkynylation of aldehydes along with the formation of a quaternary carbon center. The applicability of the method is demonstrated by the gram-scale synthesis of the key synthetic precursor of botulinum toxin inhibitors...
August 17, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28817694/a-new-holistic-3d-non-invasive-analysis-of-cellular-distribution-and-motility-on-fibroin-alginate-microcarriers-using-light-sheet-fluorescent-microscopy
#3
Serena Duchi, Filippo Piccinini, Michela Pierini, Alessandro Bevilacqua, Maria Luisa Torre, Enrico Lucarelli, Spartaco Santi
Cell interaction with biomaterials is one of the keystones to developing medical devices for tissue engineering applications. Biomaterials are the scaffolds that give three-dimensional support to the cells, and are vectors that deliver the cells to the injured tissue requiring repair. Features of biomaterials can influence the behaviour of the cells and consequently the efficacy of the tissue-engineered product. The adhesion, distribution and motility of the seeded cells onto the scaffold represent key aspects, and must be evaluated in vitro during the product development, especially when the efficacy of a specific tissue-engineered product depends on viable and functional cell loading...
2017: PloS One
https://www.readbyqxmd.com/read/28817599/anguillicola-crassus-infection-affects-mrna-expression-levels-in-gas-gland-tissue-of-european-yellow-and-silver-eel
#4
Gabriel Schneebauer, Ron P Dirks, Bernd Pelster
Using Illumina sequencing, we investigated transcriptional changes caused by the nematode Anguillicola crassus within yellow and silver eels by comparing swimbladder samples of uninfected yellow with infected yellow eels, and uninfected silver with infected silver eels, respectively. In yellow eel gas gland, the infection caused a modification of steady state mRNA levels of 1675 genes, most of them being upregulated. Functional annotation analysis based on GO terms was used to categorize identified genes with regard to swimbladder metabolism or response to the infection...
2017: PloS One
https://www.readbyqxmd.com/read/28817405/cutaneous-eruptions-in-patients-receiving-immune-checkpoint-blockade-clinicopathologic-analysis-of-the-nonlichenoid-histologic-pattern
#5
Genevieve J Kaunitz, Manisha Loss, Hira Rizvi, Sowmya Ravi, Jonathan D Cuda, Karen B Bleich, Jessica Esandrio, Inbal Sander, Dung T Le, Luis A Diaz, Julie R Brahmer, Charles G Drake, Travis J Hollmann, Mario E Lacouture, Matthew D Hellmann, Evan J Lipson, Janis M Taube
Cutaneous eruptions are among the most common immune-related adverse events (irAEs) associated with anti-programmed cell death protein 1/programmed cell death ligand 1 therapy, and are often clinically and histologically characterized as lichenoid. Nonlichenoid patterns may also occur and are likely to be encountered by surgical pathologists, given the increasing clinical use of these agents. The purpose of this study is to describe the histopathologic features of nonlichenoid cutaneous irAEs from patients receiving anti-programmed cell death protein 1/programmed cell death ligand 1 therapies for a variety of underlying advanced malignancies...
August 15, 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28817394/drivers-of-continuing-education-learning-preferences-for-veterans-affairs-women-s-health-primary-care-providers
#6
Jessica L Zuchowski, Alison B Hamilton, Donna L Washington, Arthur G Gomez, Laure Veet, Kristina M Cordasco
INTRODUCTION: Documented gaps in health professionals' training in women's health are a special concern for continuing education (CE). In the Veterans Affairs (VA) health care system, women veterans are a numerical minority, preferably assigned to designated women's health primary care providers (DWHPs). DWHPs need to maintain their knowledge and skills in women's health topics, in addition to general internal medicine topics. We explored drivers of VA DWHPs' learning preferences for women's health topics-ie, factors which influence greater and lesser learning interest...
August 16, 2017: Journal of Continuing Education in the Health Professions
https://www.readbyqxmd.com/read/28817382/quantum-mechanical-force-fields-for-condensed-phase-molecular-simulations
#7
Timothy J Giese, Darrin M York
Molecular simulations are powerful tools for providing atomic-level details into complex chemical and physical processes that occur in the condensed phase. For strongly interacting systems where quantum many-body effects are known to play an important role, density-functional methods are often used to provide the model with the potential energy used to drive dynamics. These methods, however, suffer from two major drawbacks. First, they are often too computationally intensive to practically apply to large systems over long time scales, limiting their scope of application...
August 17, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28817276/selectfluor-triggered-tandem-cyclization-of-o-hydroxyarylenaminones-to-access-difluorinated-2-amino-substituted-chromanones
#8
Qing-Lan Zhao, Hao-Yue Xiang, Jun-An Xiao, Peng-Ju Xia, Jun-Jie Wang, Xiao-Qing Chen, Hua Yang
A practical and straightforward synthetic route through a selectfluor-triggered tandem cyclization of o-hydroxyarylenaminone was developed to construct a variety of difluorinated 2-amino-substituted chromanones. This novel protocol features mild reaction conditions, operational simplicity, and broad substrate scope. The enamine moiety in o-hydroxyarylenaminone played dual roles to enable high efficiency in the difluorination and intramolecular cyclization, leading to the accomplishment of new class of difluorinated 2-amino-substituted chromanones for pharmaceutical studies...
August 17, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28816741/reflectance-confocal-microscopy-criteria-of-pigmented-squamous-cell-carcinoma-in-situ
#9
Neda Shahriari, Jane M Grant-Kels, Harold S Rabinovitz, Margaret Oliviero, Alon Scope
Pigmented squamous cell carcinoma in situ (pSCCis) is difficult to diagnose based on clinical and dermoscopic examination. Reflectance confocal microscopy (RCM) allows noninvasive differentiation between malignant and benign pigmented skin lesions. We determined the frequency of key RCM features of pSCCis and correlated the RCM criteria with the corresponding dermoscopic and histopathologic criteria. The study included 28 lesions with biopsy-proven diagnosis of pSCCis derived from 28 patients. Clinical, dermoscopic, and RCM images of these lesions were retrospectively analyzed by 3 independent observers...
August 9, 2017: American Journal of Dermatopathology
https://www.readbyqxmd.com/read/28816461/access-to-cyclobutadienes-via-an-organocatalytic-dienamine-iminium-allenamine-cascade-approach
#10
Wenjun Li, Ming Lang, Jian Wang
A new organocatalytic route to cyclobutadienes from α,β-unsaturated aldehydes and ynals is described. This protocol allows a broad substrate scope and mild conditions. Furthermore, a proposed mechanism of a dienamine-iminium-allenamine cascade process is discussed.
August 17, 2017: Organic Letters
https://www.readbyqxmd.com/read/28816454/syntheses-of-4-heteroaryl-cyclohexanones-via-palladium-catalyzed-ester-%C3%AE-arylation-and-decarboxylation
#11
Jianguang Zhou, Qun Jiang, Peng Fu, Siqian Liu, Sisi Zhang, Su Xu, Qi Zhang
An alternative synthesis of 4-(heteroaryl)cyclohexanones is described, featuring a palladium catalyzed ester α-arylation followed by decarboxylation. The substrate scope is broad with a wide range of heteroaryl halides. Especially, the reaction robustness is demonstrated by the synthesis of >10g of 4-(pyrazin-2-yl)cyclohexanone with a 85% overall yield.
August 17, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28816439/1-3-dipolar-cycloaddition-reactions-for-the-synthesis-of-novel-oxindole-derivatives-and-their-cytotoxic-properties
#12
Prakash Rambhau Mali, Prashishkumar Kisan Shirsat, Navnath Bapurao Khomane, V Lakshama Nayak, Jagadeesh Babu Nanubolu, Harshadas Mitaram Meshram
The multicomponent reaction between isatin, amino acid, but-2-ynedioates and phenacyl bromide has been developed using microwave irradiation under catalyst and base free conditions in aqueous medium. This synthetic protocol is useful for the synthesis of various functionalized spirooxindole derivatives. This MCR exhibits a broad substrate scope with excellent yields and shorter reaction time. Additionally the synthesized spirooxindole derivatives were evaluated for their anticancer activity against three human cancer cell lines; MCF-7 (breast), A549 (lung) and Hela cervical...
August 17, 2017: ACS Combinatorial Science
https://www.readbyqxmd.com/read/28816385/contrasting-physiological-responses-to-future-ocean-acidification-among-arctic-copepod-populations
#13
Peter Thor, Allison Bailey, Sam Dupont, Piero Calosi, Janne E Søreide, Pierre De Wit, Ella Guscelli, Lea Loubet-Sartrou, Ida Marie Deichmann, Martin M Candee, Camilla Svensen, Andrew L King, Richard G J Bellerby
Widespread ocean acidification (OA) is modifying the chemistry of the global ocean, and the Arctic is recognised as the region where the changes will progress at the fastest rate. Moreover, Arctic species show lower capacity for cellular homeostasis and acid-base regulation rendering them particularly vulnerable to OA. In the present study, we found physiological differences in OA response across geographically separated populations of the keystone Arctic copepod Calanus glacialis. In copepodite stage CIV, measured reaction norms of ingestion rate and metabolic rate showed severe reductions in ingestion and increased metabolic expenses in two populations from Svalbard (Kongsfjord and Billefjord) whereas no effects were observed in a population from the Disko Bay, West Greenland...
August 17, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28816322/ultrasonication-enhanced-gelation-properties-of-a-versatile-amphiphilic-formamidine-based-gelator-exhibiting-both-organogelation-and-hydrogelation-abilities
#14
Jürgen Bachl, Diego Sampedro, Judith Mayr, David Díaz Díaz
We describe the preparation of a novel amphiphilic gelator built from a formamidine core, which is able to form a variety of physical organogels and hydrogels at concentrations ranging from 15 to 150 mg mL(-1). Interestingly, ultrasound treatment of isotropic solutions (i.e., gel-precursor) resulted in a remarkable enhancement of the gelation kinetics as well as the gelation scope and characteristic gel properties (e.g., critical gelation concentration, gel-to-sol transition temperature, viscoelastic moduli) in comparison to the heating-cooling protocol typically used to obtain supramolecular gels...
August 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28816303/reversible-surface-functionalisation-of-emulsion-templated-porous-polymers-using-dithiophenol-maleimide-functional-macromolecules
#15
A M Eissa, P Wilson, C Chen, J Collins, M Walker, D M Haddleton, N R Cameron
A new facile and efficient route for the chemical functionalisation of thiol-acrylate polyHIPE materials with responsive macromolecules using the highly emissive dithiomaleimide (DTM) linker is demonstrated. Functionalisation is found to be reversible upon addition of a thiol-containing compound, glutathione, resulting in switchable surface properties including fluorescence and wettability, hence broadening the scope of applications.
August 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28816063/acute-cardiovascular-care-association-position-paper-on-intensive-cardiovascular-care-units-an-update-on-their-definition-structure-organisation-and-function
#16
Eric Bonnefoy-Cudraz, Hector Bueno, Gianni Casella, Elia De Maria, Donna Fitzsimons, Sigrun Halvorsen, Christian Hassager, Zaza Iakobishvili, Ahmed Magdy, Toomas Marandi, Jorge Mimoso, Alexander Parkhomenko, Susana Price, Richard Rokyta, Francois Roubille, Pranas Serpytis, Avi Shimony, Janina Stepinska, Diana Tint, Elina Trendafilova, Marco Tubaro, Christiaan Vrints, David Walker, Doron Zahger, Endre Zima, Robert Zuckerman, Maddalena Lettino
Acute cardiovascular care has progressed considerably since the last position paper was published 10 years ago. It is now a well-defined, complex field with demanding multidisciplinary teamworking. The Acute Cardiovascular Care Association has provided this update of the 2005 position paper on acute cardiovascular care organisation, using a multinational working group. The patient population has changed, and intensive cardiovascular care units now manage a large range of conditions from those simply requiring specialised monitoring, to critical cardiovascular diseases with associated multi-organ failure...
August 1, 2017: European Heart Journal. Acute Cardiovascular Care
https://www.readbyqxmd.com/read/28815986/modulatory-functionalization-of-gold-nanorods-using-supramolecular-assemblies
#17
Sundo Jeong, Hongrual Park, Dongmin Seon, Jongwan Choi, Ki Bum Hong, Jiseok Lee, Chaekyu Kim, Jung-Keun Kim, Myoung-Hwan Park
Supramolecular assembly-mediated functionalization of gold nanorods (GNRs) has been developed by reversible phase transfer between water and oils, which offers a facile method for fabricating stubborn GNRs with surface charge tunability. In this regard, TMA-GNRs were initially prepared from conventional CTAB-GNRs via a ligand exchange reaction in the presence of excess of TMA ligands. To further expand their functionality and potential applications, electrostatic assemblies of positively charged TMA-GNRs with negatively charged oleate ions were prepared...
August 17, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28815966/trifluoromethyl-oxetanes-synthesis-and-evaluation-as-a-tert-butyl-isostere
#18
Paramita Mukherjee, Martin Pettersson, Jason K Dutra, Longfei Xie, Christopher W Am Ende
The synthesis of a new trifluoromethyl oxetane was developed utilizing a Corey-Chaykovsky epoxidation/ring-expansion reaction of trifluoromethyl ketones. The reaction was shown to proceed under mild conditions and displays a broad substrate scope. The trifluoromethyl oxetane was also evaluated as a tert-butyl isostere in the context of the γ-secretase modulator (GSM) program. We demonstrate that the trifluoromethyl oxetane-containing GSM has reduced lipophilicity, improved lipophilic efficiency (LipE) and metabolic stability relative to the corresponding tert-butyl GSM analog, thus highlighting several benefits of trifluoromethyl oxetane as a more polar tert-butyl isostere...
August 16, 2017: ChemMedChem
https://www.readbyqxmd.com/read/28815919/graphene-oxide-as-a-carbocatalyst-for-diels-alder-reaction-in-aqueous-media
#19
Yarabhally R Girish, Subrata Pandit, Subhendu Pandit, Mrinmoy De
The [4+2] Cycloaddition reaction, known as Diels-Alder reaction, has a great importance in synthetic organic chemistry and frequently used in synthesis of natural products containing six-membered ring. Herein, we have reported an efficient protocol for Diels-Alder reaction between 9-hydroxymethylanthracene and N-substituted maleimides using two dimensional graphene oxide (GO) as a heterogeneous carbocatalyst in an aqueous medium at room temperature. High yield, wide substrate scope, low temperature, exceptional functional group tolerance, atom-economical, and water as a green solvent are the noteworthy features of this protocol...
August 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28815903/rhenium-loaded-tio2-a-highly-versatile-and-chemoselective-catalyst-for-the-hydrogenation-of-carboxylic-acid-derivatives-and-the-n-methylation-of-amines-using-h2-and-co2
#20
Takashi Toyao, Hakim S M A Siddiki, Yoshitsugu Morita, Takashi Kamachi, Abeda S Touchy, Wataru Onodera, Kenichi Kon, Shinya Furukawa, Hiroko Ariga, Kiyotaka Asakura, Kazunari Yoshizawa, Ken-Ichi Shimizu
Herein, we report a heterogeneous TiO2-supported Re catalyst (Re/TiO2) that promotes various selective hydrogenation reactions, e.g. hydrogenation of esters to alcohols, hydrogenation of amides to amines, and N-methylation of amines using H2 and CO2. Initially, Re/TiO2 was evaluated in the context of the selective hydrogenation of 3-phenylpropionic acid methyl ester to afford 3-phenylpropanol (pH2 = 5 MPa, T = 180 ºC), where revealed a superior performance relative to other catalysts explored in this study...
August 16, 2017: Chemistry: a European Journal
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