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https://www.readbyqxmd.com/read/28454480/immobilization-of-ph-sensitive-cdte-quantum-dots-in-a-poly-acrylate-hydrogel-for-microfluidic-applications
#1
M Franke, S Leubner, A Dubavik, A George, T Savchenko, C Pini, P Frank, D Melnikau, Y Rakovich, N Gaponik, A Eychmüller, A Richter
Microfluidic devices present the basis of modern life sciences and chemical information processing. To control the flow and to allow optical readout, a reliable sensor material that can be easily utilized for microfluidic systems is in demand. Here, we present a new optical readout system for pH sensing based on pH sensitive, photoluminescent glutathione capped cadmium telluride quantum dots that are covalently immobilized in a poly(acrylate) hydrogel. For an applicable pH sensing the generated hybrid material is integrated in a microfluidic sensor chip setup...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28453429/anti-microbial-coating-innovations-to-prevent-infectious-diseases-amici-cost-action-ca15114
#2
Colum P Dunne, Minna M Keinänen-Toivola, Anne Kahru, Birgit Teunissen, Hulya Olmez, Isabel Gouveia, Luis Melo, Kazimierz Murzyn, Martina Modic, Merja Ahonen, Pete Askew, Theofilos Papadopoulos, Christian Adlhart, Francy R L Crijns
Worldwide, millions of patients are affected annually by healthcare-associated infection (HCAI), impacting up to 80,000 patients in European Hospitals on any given day. This represents not only public health risk, but also an economic burden. Complementing routine hand hygiene practices, cleaning and disinfection, antimicrobial coatings hold promise based, in essence, on the application of materials and chemicals with persistent bactericidal or -static properties onto surfaces or in textiles used in healthcare environments...
April 28, 2017: Bioengineered
https://www.readbyqxmd.com/read/28453300/psychiatry-sex-and-science-the-making-of-adolescent-motherhood-in-southern-brazil
#3
Dominique P Béhague
Research linking teen motherhood to psychoneurodevelopmental causes and pathologies has proliferated in the past two decades. In Brazil, a psychodevelopmental project of teen motherhood has gained traction despite many experts' long-standing commitment to psychodynamic psychiatry and social epidemiology, generating epistemic tension rather than substitution. Drawing on historical ethnography conducted in Southern Brazil, I explore how this project materialized through the co-production of epistemic struggles, remedial interventions, and ontological politics...
April 28, 2017: Medical Anthropology
https://www.readbyqxmd.com/read/28449298/all-silicon-switchable-magnetoelectric-effect-via-interlayer-exchange-coupling
#4
Hang Liu, Jia Tao Sun, Huixia Fu, Peijie Sun, Yuanping Feng, Sheng Meng
The magnetoelectric (ME) effect originating from the effective coupling between electric field and magnetism is an exciting frontier in nanoscale science such as magnetic tunneling junction (MTJ), ferroelectric/piezoelectric heterojunctions etc. The realization of switchable ME effect under external electric field in d^0 semiconducting materials of single composition is needed especially for all-silicon spintronics applications because of its natural compatibility with current industry. We employ the density functional theory (DFT) to reveal that the pristine Si(111)-√3×√3R30º (Si√3 hereafter) reconstructed surfaces of thin films with thickness smaller than eleven bilayers support sizeable linear ME effect with switchable direction of magnetic moment under external electric field...
April 27, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28447671/the-scaffold-microenvironment-for-stem-cell-based-bone-tissue-engineering
#5
REVIEW
Zhichao Hao, Zhenhua Song, Jun Huang, Keqing Huang, Amanda Panetta, Zhipeng Gu, Jun Wu
Bone tissue engineering uses the principles and methods of engineering and life sciences to study bone structure, function and growth mechanism for the purposes of repairing, maintaining and improving damaged bone tissue. Scaffolds not only provide structural support for stem cells in cell adhesion and proliferation and bone formation, but also serve as a microenvironment for guiding stem cell differentiation and tissue regeneration and for controlling tissue structure. This review presents the research status of the scaffold microenvironment for bone-related stem cells based on bone tissue engineering...
April 27, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28447029/cornell-alliance-for-science-evaluation-of-consensus-on-genetically-modified-food-safety-weaknesses-in-study-design
#6
Michael N Antoniou, Claire J Robinson
Cornell Alliance for Science has launched an initiative in which "citizen scientists" are called upon to evaluate studies on health risks of genetically modified (GM) crops and foods. The purpose is to establish whether the consensus on GM food safety claimed by the American Association for the Advancement of Science (AAAS) is supported by a review of the scientific literature. The Alliance's citizen scientists are examining more than 12,000 publication abstracts to quantify how far the scientific literature supports the AAAS's statement...
2017: Frontiers in Public Health
https://www.readbyqxmd.com/read/28446341/decarboxylative-alkynylation-and-cyanation-of-carboxylic-acids-using-photoredox-catalysis-and-hypervalent-iodine-reagents
#7
Franck Le Vaillant, Jérôme Waser
Alkynes and nitriles are important functional groups that serve as versatile building blocks in organic synthesis and find applications in material and medicinal sciences. A convenient and straightforward access to both classes of compounds under mild conditions is, therefore, highly desirable. Herein, we disclose the decarboxylative alkynylation and cyanation of broadly available carboxylic acids using photoredox catalysis and hypervalent iodine reagents. Choices of both catalysts and reagents were crucial...
April 26, 2017: Chimia
https://www.readbyqxmd.com/read/28445033/c-h-functionalization-of-azines
#8
Kei Murakami, Shuya Yamada, Takeshi Kaneda, Kenichiro Itami
Azines, which are six-membered aromatic compounds containing one or more nitrogen atoms, serve as ubiquitous structural cores of aromatic species with important applications in biological and materials sciences. Among a variety of synthetic approaches toward azines, C-H functionalization represents the most rapid and atom-economical transformation, and it is advantageous for the late-stage functionalization of azine-containing functional molecules. Since azines have several C-H bonds with different reactivities, the development of new reactions that allow for the functionalization of azines in a regioselective fashion has comprised a central issue...
April 26, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28443654/quantifying-the-self-assembly-behavior-of-anisotropic-nanoparticles-using-liquid-phase-transmission-electron-microscopy
#9
Binbin Luo, John W Smith, Zihao Ou, Qian Chen
For decades, one of the overarching objectives of self-assembly science has been to define the rules necessary to build functional, artificial materials with rich and adaptive phase behavior from the bottom-up. To this end, the computational and experimental efforts of chemists, physicists, materials scientists, and biologists alike have built a body of knowledge that spans both disciplines and length scales. Indeed, today control of self-assembly is extending even to supramolecular and molecular levels, where crystal engineering and design of porous materials are becoming exciting areas of exploration...
April 26, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28443653/borophane-as-a-bench-mate-of-graphene-a-potential-2d-material-for-anode-of-li-and-na-ion-batteries
#10
Naresh K Jena, Rafael B Araujo, Vivekanand Shukla, Rajeev Ahuja
Borophene, single atomic-layer sheet of boron (Science, 2015, 350, 1513), is a rather new entrant into the burgeoning class of 2D materials. Borophene exhibits anisotropic metallic properties whereas its hydrogenated counterpart borophane is reported to be a gapless Dirac material lying on the same bench with the celebrated graphene. Interestingly, this transition of borophane also rendered stability to it considering the fact that borophene was synthesized under ultra-high vacuum conditions on a metallic (Ag) substrate...
April 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28442145/mechanical-characteristic-and-biological-behaviour-of-implanted-and-restorative-bioglasses-used-in-medicine-and-dentistry-a-systematic-review
#11
REVIEW
F Lizzi, C Villat, N Attik, P Jackson, B Grosgogeat, C Goutaudier
OBJECTIVE: Nowadays bioactive glasses are finding increasing applications in medical practice due to their ability to stimulate re-mineralisation. However, they are intrinsically brittle materials and the study of new compositions will open up new scenarios enhancing their mechanical properties and maintaining the high bioactivity for a broader range of applications. This systematic review aims to identify the relationship between the composition of bioactive glasses used in medical applications and their influence on the mechanical and biological properties...
April 22, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28441705/oral-complications-of-the-oromaxillofacial-area-radiotherapy
#12
Hakimeh Ahadian, Soghra Yassaei, Fathollah Bouzarjomehri, Mehrdad Ghaffari Targhi, Khatereh Kheirollahi
Background: The incidence of malignancies is on the rise in different communities, making them the second most important cause of mortality in developed countries. One of the treatment modalities for these malignancies, apart from surgery and chemotherapy, is radiotherapy which might in itself lead to some complications in the area receiving radiation. The present study was undertaken to evaluate the prevalence of oral complications in patients undergoing radiotherapy of the oromaxillofacial area in Shahid Ramazanzadeh Radiotherapy Center in Shahid Sadoughi University of Medical Sciences...
March 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28441011/synthesis-characterization-and-dft-analysis-of-bis-terpyridyl-based-molecular-cobalt-complexes
#13
Safwan Aroua, Tanya K Todorova, Paul Hommes, Lise-Marie Chamoreau, Hans-Ulrich Reissig, Victor Mougel, Marc Fontecave
Terpyridine ligands are widely used in chemistry and material sciences owing to their ability to form stable molecular complexes with a large variety of metal ions. In that context, variations of the substituents on the terpyridine ligand allow modulation of the material properties. Applying the Stille cross-coupling reaction, we prepared with good yields a new series of terpyridine ligands possessing quinoline-type moieties in ortho, meta, and para positions and dimethylamino substituents at central or distal positions...
April 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28439980/nanophotonic-trapping-precise-manipulation-and-measurement-of-biomolecular-arrays
#14
REVIEW
James E Baker, Ryan P Badman, Michelle D Wang
Optical trapping is a powerful and widely used laboratory technique in the biological and materials sciences that enables rapid manipulation and measurement at the nanometer scale. However, expanding the analytical throughput of this technique beyond the serial capabilities of established single-trap microscope-based optical tweezers remains a current goal in the field. In recent years, advances in nanotechnology have been leveraged to create innovative optical trapping methods that increase the number of available optical traps and permit parallel manipulation and measurement of arrays of optically trapped targets...
April 24, 2017: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/28439151/sinus-grafts-science-and-techniques-then-and-now
#15
REVIEW
Yazad Gandhi
INTRODUCTION: Sinus lifts have been around for more than four decades now, and the amount of changes that we have seen in techniques and armamentarium coupled with the advent of newer materials is worth taking note of. MATERIALS AND METHODS: A complete review of the literature was done since the advent of ways and means to augment the posterior maxilla with a run through of various advantages and disadvantages of the same. CONCLUSION: In conclusion, we can say that this procedure is today very predictable and offers clinicians a possibility to rehabilitate the posterior maxilla with implant-based solutions...
June 2017: Journal of Maxillofacial and Oral Surgery
https://www.readbyqxmd.com/read/28438428/the-impact-of-stem-aberration-correction-on-materials-science
#16
Stephen J Pennycook
Over the last three decades the scanning transmission electron microscope (STEM) has gone from a specialized instrument for nanoscale analysis to the microscope of choice for atomic resolution imaging of materials, allowing incoherent high-angle annular dark field (Z-contrast) imaging, coherent phase contrast modes (conventional and annular bright field), electron energy loss and energy dispersive X-ray spectroscopy. All signals are achieving atomic resolution and several are available simultaneously. This would not have been possible without the development of an aberration corrector for the STEM, spearheaded by Ondrej Krivanek in the late 1990s, which finally allowed the benefits of the STEM to translate from "in-principle" to actual daily practice...
March 18, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28436674/general-dialdehyde-click-chemistry-for-amine-bioconjugation
#17
Sina Elahipanah, Paul J O'Brien, Dmitry Rogozhnikov, Muhammad N Yousaf
The development of methods for conjugating a range of molecules to primary amine functional groups has revolutionized the fields of chemistry, biology, and material science. The primary amine is a key functional group and one of the most important nucleophiles and bases used in all of synthetic chemistry. Therefore, tremendous interest in the synthesis of molecules containing primary amines and strategies to devise chemical reactions to react with primary amines has been at the core of chemical research. In particular, primary amines are a ubiquitous functional group found in biological systems as free amino acids, as key side chain lysines in proteins, and in signaling molecules and metabolites and are also present in many natural product classes...
April 24, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28435877/design-and-function-of-biomimetic-multilayer-water-purification-membranes
#18
Shengjie Ling, Zhao Qin, Wenwen Huang, Sufeng Cao, David L Kaplan, Markus J Buehler
Multilayer architectures in water purification membranes enable increased water throughput, high filter efficiency, and high molecular loading capacity. However, the preparation of membranes with well-organized multilayer structures, starting from the nanoscale to maximize filtration efficiency, remains a challenge. We report a complete strategy to fully realize a novel biomaterial-based multilayer nanoporous membrane via the integration of computational simulation and experimental fabrication. Our comparative computational simulations, based on coarse-grained models of protein nanofibrils and mineral plates, reveal that the multilayer structure can only form with weak interactions between nanofibrils and mineral plates...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28435669/reframing-the-science-and-policy-of-nicotine-illegal-drugs-and-alcohol-conclusions-of-the-alice-rap-project
#19
Peter Anderson, Virginia Berridge, Patricia Conrod, Robert Dudley, Matilda Hellman, Dirk Lachenmeier, Anne Lingford-Hughes, David Miller, Jürgen Rehm, Robin Room, Laura Schmidt, Roger Sullivan, Tamyko Ysa, Antoni Gual
In 2013, illegal drug use was responsible for 1.8% of years of life lost in the European Union, alcohol was responsible for 8.2% and tobacco for 18.2%, imposing economic burdens in excess of 2.5% of GDP. No single European country has optimal governance structures for reducing the harm done by nicotine, illegal drugs and alcohol, and existing ones are poorly designed, fragmented, and sometimes cause harm. Reporting the main science and policy conclusions of a transdisciplinary five-year analysis of the place of addictions in Europe, researchers from 67 scientific institutions addressed these problems by reframing an understanding of addictions...
2017: F1000Research
https://www.readbyqxmd.com/read/28434784/perspectives-on-in-situ-electron-microscopy
#20
Haimei Zheng, Yimei Zhu
In situ transmission electron microscopy (TEM) with the ability to reveal materials dynamic processes with high spatial and temporal resolution has attracted significant interest. The recent advances in in situ methods, including liquid and gas sample environment, pump-probe ultrafast microscopy, nanomechanics and ferroelectric domain switching the aberration corrected electron optics as well as fast electron detector has opened new opportunities to extend the impact of in situ TEM in broad areas of research ranging from materials science to chemistry, physics and biology...
March 29, 2017: Ultramicroscopy
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