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Nanoscience

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https://www.readbyqxmd.com/read/28521201/validation-of-the-use-of-an-artificial-mitochondrial-reporter-dna-vector-containing-a-cytomegalovirus-promoter-for-mitochondrial-transgene-expression
#1
Yuma Yamada, Takuya Ishikawa, Hideyoshi Harashima
Mitochondria have their own gene expression system that is independent of the nuclear system, and control cellular functions in cooperation with the nucleus. While a number of useful technologies for achieving nuclear transgene expression have been reported, only a few have focused on mitochondria. In this study, we validated the utility of an artificial mitochondrial DNA vector with a virus promoter on mitochondrial transgene expression. We designed and constructed pCMV-mtLuc (CGG) that contains a CMV promotor derived from Cytomegalovirus and an artificial mitochondrial genome with a NanoLuc (Nluc) luciferase gene that records adjustments to the mitochondrial codon system...
May 10, 2017: Biomaterials
https://www.readbyqxmd.com/read/28514702/nanoscale-morphological-analysis-of-soft-matter-aggregates-with-fractal-dimension-ranging-from-1-to-3
#2
REVIEW
Francesco Valle, Marco Brucale, Stefano Chiodini, Eva Bystrenova, Cristiano Albonetti
While the widespread emergence of nanoscience and nanotechnology can be dated back to the early eighties, the last decade has witnessed a true coming of age of this research field, with novel nanomaterials constantly finding their way into marketed products. The performance of nanomaterials being dominated by their nanoscale morphology, their quantitative characterization with respect to a number of properties is often crucial. In this context, those imaging techniques able to resolve nanometer scale details are clearly key players...
May 4, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/28476966/biocompatibility-assessment-of-sio2-tio2-composite-powder-on-mg63-osteoblast-cell-lines-for-orthopaedic-applications
#3
Maniickam Chellappa, Bezawada Thejaswini, Uthirapathy Vijayalakshmi
The objective of this study is to evaluate the biocompatibility of composite powder consisting of silica and titania (SiO2-TiO2) for biomedical applications. The advancement of nanoscience and nanotechnology encourages researchers to actively participate in reinvention of existing materials with improved physical, chemical and biological properties. Hence, a composite/hybrid material has given birth of new materials with intriguing properties. In the present investigation, SiO2-TiO2 composite powder was synthesised by sol-gel method and the prepared nanocomposite was characterised for its phase purity, functional groups, surface topography by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy...
February 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28451246/versatile-synthesis-and-enlargement-of-functionalized-distorted-heptagon-containing-nanographenes
#4
Irene R Márquez, Noelia Fuentes, Carlos M Cruz, Virginia Puente-Muñoz, Lia Sotorrios, M Luisa Marcos, Duane Choquesillo-Lazarte, Blanca Biel, Luis Crovetto, Enrique Gómez-Bengoa, M Teresa González, Ruben Martin, Juan M Cuerva, Araceli G Campaña
Highly distorted polycyclic aromatic hydrocarbons (PAHs) are predicted to be attractive goals in nanoscience owing to the new properties they can exhibit. We have shown that a variety of functionalized distorted heptagon-containing nanographenes can be easily prepared from simple building blocks by a sequence of Co-catalyzed cyclotrimerization and cyclodehydrogenation reactions. The versatility of this strategy allows easy subsequent enlargement of these nanostructures by Ni-catalyzed cross-coupling and final cyclodehydrogenation reactions...
February 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28441713/accelerating-advances-in-science-engineering-and-medicine-through-nanoscience-and-nanotechnology
#5
Warren C W Chan, Ali Khademhosseini, Helmuth Möhwald, Wolfgang J Parak, Jeff F Miller, Aydogan Ozcan, Paul S Weiss
No abstract text is available yet for this article.
April 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28436674/general-dialdehyde-click-chemistry-for-amine-bioconjugation
#6
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/28415554/phytosynthesis-of-silver-nanoparticles-using-aqueous-leaf-extracts-of-lippia-citriodora-antimicrobial-larvicidal-and-photocatalytic-evaluations
#7
Elias E Elemike, Damian C Onwudiwe, Anthony C Ekennia, Richard C Ehiri, Nnaemeka J Nnaji
Nanoscience and nanotechnology represent new and enabling platforms that promise to provide broad range of novel and improved technologies for environmental, biological and other scientific applications. This study reports the synthesis of silver nanoparticles mediated by aqueous leaf extract of Lippia citriodora at two different temperatures of 50°C and 90°C. The synthesis of colloidal silver nanoparticles (AgNPs) was monitored by the use of UV-visible spectroscopy at different temperatures and time intervals...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28395475/in-situ-probing-the-relaxation-properties-of-ultrathin-polystyrene-films-by-using-electric-force-microscopy
#8
Xiaoqin Qian, Zihong Lin, Li Guan, Qiang Li, Yapei Wang, Meining Zhang, Mingdong Dong
The rapid development of nanoscience and nanotechnology involves polymer films with thickness down to nanometer scale. However, the properties of ultrathin polymer films are extremely different from that of bulk matrix or thin films. It is challenging to distinguish the changes of physical properties in ultrathin films using conventional techniques especially when it locates near the glass transition temperature (T g). In this work, we successfully evaluated a series of physical properties of ultrathin polystyrene (PS) films by in situ characterizing the discharging behavior of the patterned charges using electric force microscopy...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28386010/all-printed-thin-film-transistors-from-networks-of-liquid-exfoliated-nanosheets
#9
Adam G Kelly, Toby Hallam, Claudia Backes, Andrew Harvey, Amir Sajad Esmaeily, Ian Godwin, João Coelho, Valeria Nicolosi, Jannika Lauth, Aditya Kulkarni, Sachin Kinge, Laurens D A Siebbeles, Georg S Duesberg, Jonathan N Coleman
All-printed transistors consisting of interconnected networks of various types of two-dimensional nanosheets are an important goal in nanoscience. Using electrolytic gating, we demonstrate all-printed, vertically stacked transistors with graphene source, drain, and gate electrodes, a transition metal dichalcogenide channel, and a boron nitride (BN) separator, all formed from nanosheet networks. The BN network contains an ionic liquid within its porous interior that allows electrolytic gating in a solid-like structure...
April 7, 2017: Science
https://www.readbyqxmd.com/read/28378421/fermented-cereal-beverages-from-probiotic-prebiotic-and-synbiotic-towards-nanoscience-designed-healthy-drinks
#10
REVIEW
Ivan Salmerón
The consumption of fermented food by human kind goes a long way back in history and there are as many types of fermented food as civilizations. Food science and technology has progressed from designing nutritional food towards food with health improvement characteristics such as functional foods. In this sense, the area of food with properties to improve gastrointestinal health like probiotics, prebiotics and synbiotics has been the most important segment within functional foods. Most of these products are dairy-based so the development of non-dairy gut improvement products has been of great interest for the food industry, resulting in the rise of cereal-based probiotic and synbiotic products...
April 4, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28336882/antimicrobial-polymers-in-the-nano-world
#11
REVIEW
Marta Álvarez-Paino, Alexandra Muñoz-Bonilla, Marta Fernández-García
Infections are one of the main concerns of our era due to antibiotic-resistant infections and the increasing costs in the health-care sector. Within this context, antimicrobial polymers present a great alternative to combat these problems since their mechanisms of action differ from those of antibiotics. Therefore, the microorganisms' resistance to these polymeric materials is avoided. Antimicrobial polymers are not only applied in the health-care sector, they are also used in many other areas. This review presents different strategies that combine nanoscience and nanotechnology in the polymer world to combat contaminations from bacteria, fungi or algae...
February 22, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28335338/green-synthesis-of-iron-nanoparticles-and-their-environmental-applications-and-implications
#12
REVIEW
Sadia Saif, Arifa Tahir, Yongsheng Chen
Recent advances in nanoscience and nanotechnology have also led to the development of novel nanomaterials, which ultimately increase potential health and environmental hazards. Interest in developing environmentally benign procedures for the synthesis of metallic nanoparticles has been increased. The purpose is to minimize the negative impacts of synthetic procedures, their accompanying chemicals and derivative compounds. The exploitation of different biomaterials for the synthesis of nanoparticles is considered a valuable approach in green nanotechnology...
November 12, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335250/nanoparticles-for-catalysis
#13
EDITORIAL
Sergio Navalón, H García
Nanoscience emerged in the last decades of the 20th century with the general aim to determine those properties that appear when small particles of nanometric dimensions are prepared and stabilized.[...].
June 23, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28331307/current-applications-and-future-prospects-of-nanomaterials-in-tumor-therapy
#14
REVIEW
Yu Huang, Chao-Qiang Fan, Hui Dong, Su-Min Wang, Xiao-Chao Yang, Shi-Ming Yang
Tumors are one of the most serious human diseases and cause numerous global deaths per year. In spite of many strategies applied in tumor therapy, such as radiation therapy, chemotherapy, surgery, and a combination of these treatments, tumors are still the foremost killer worldwide among human diseases, due to their specific limitations, such as multidrug resistance and side effects. Therefore, it is urgent and necessary to develop new strategies for tumor therapy. Recently, the fast development of nanoscience has paved the way for designing new strategies to treat tumors...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28300410/delayed-molecular-triplet-generation-from-energized-lead-sulfide-quantum-dots
#15
Sofia Garakyaraghi, Cédric Mongin, Devin B Granger, John E Anthony, Felix N Castellano
The generation and transfer of triplet excitons across the molecular-semiconductor interface represents an important technological breakthrough featuring numerous fundamental scientific questions. This contribution demonstrates curious delayed formation of TIPS-pentacene molecular triplet excitons bound on the surface of PbS nanocrystals mediated through the initial production of a proposed charge transfer intermediate following selective excitation of the PbS quantum dots. Ultrafast UV-vis and near-IR transient absorption spectroscopy was used to track the dynamics of the initial PbS exciton quenching as well as time scale of the formation of molecular triplet excited states that persisted for 10 μs on the PbS surface, enabling subsequent energy and electron transfer reactivity...
March 20, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28294956/single-target-sputter-deposition-of-alloy-nanoparticles-with-adjustable-composition-via-a-gas-aggregation-cluster-source
#16
Alexander Vahl, Julian Strobel, Wiebke Reichstein, Oleksandr Polonskyi, Thomas Strunskus, Lorenz Kienle, Franz Faupel
Alloy nanoparticles with variable compositions add a new dimension to nanoscience and have many applications. Here we suggest a novel approach for the fabrication of variable composition alloy nanoparticles that is based on a Haberland type gas aggregation cluster source with a custom-made multicomponent target for magnetron sputtering. The approach, which was demonstrated here for gold-rich AgAu nanoparticles, combines a narrow nanoparticle size distribution with in operando variation of composition via the gas pressure as well as highly efficient usage of target material...
April 28, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28277508/nanoscience-single-atom-data-storage
#17
Roberta Sessoli
No abstract text is available yet for this article.
March 8, 2017: Nature
https://www.readbyqxmd.com/read/28272445/real-time-monitoring-and-visualization-of-the-multi-dimensional-motion-of-an-anisotropic-nanoparticle
#18
Gi-Hyun Go, Seungjin Heo, Jong-Hoi Cho, Yang-Seok Yoo, MinKwan Kim, Chung-Hyun Park, Yong-Hoon Cho
As interest in anisotropic particles has increased in various research fields, methods of tracking such particles have become increasingly desirable. Here, we present a new and intuitive method to monitor the Brownian motion of a nanowire, which can construct and visualize multi-dimensional motion of a nanowire confined in an optical trap, using a dual particle tracking system. We measured the isolated angular fluctuations and translational motion of the nanowire in the optical trap, and determined its physical properties, such as stiffness and torque constants, depending on laser power and polarization direction...
March 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28257567/hybrid-nanoscopy-of-hybrid-nanomaterials
#19
Patricia Bondia, Rocío Jurado, Santiago Casado, José M Domínguez-Vera, Natividad Gálvez, Cristina Flors
The combination of complementary techniques to characterize materials at the nanoscale is crucial to gain a more complete picture of their structure, a key step to design and fabricate new materials with improved properties and diverse functions. Here it is shown that correlative atomic force microscopy (AFM) and localization-based super-resolution microscopy is a useful tool that provides insight into the structure and emissive properties of fluorescent β-lactoglobulin (βLG) amyloid-like fibrils. These hybrid materials are made by functionalization of βLG with organic fluorophores and quantum dots, the latter being relevant for the production of 1D inorganic nanostructures templated by self-assembling peptides...
May 2017: Small
https://www.readbyqxmd.com/read/28252036/universality-of-periodicity-as-revealed-from-interlayer-mediated-cracks
#20
Myung Rae Cho, Jong Hyun Jung, Min Key Seo, Sung Un Cho, Young Duck Kim, Jae Hyun Lee, Yong Seung Kim, Pilkwang Kim, James Hone, Jisoon Ihm, Yun Daniel Park
A crack and its propagation is a challenging multiscale materials phenomenon of broad interest, from nanoscience to exogeology. Particularly in fracture mechanics, periodicities are of high scientific interest. However, a full understanding of this phenomenon across various physical scales is lacking. Here, we demonstrate periodic interlayer-mediated thin film crack propagation and discuss the governing conditions resulting in their periodicity as being universal. We show strong confinement of thin film cracks and arbitrary steering of their propagation by inserting a predefined thin interlayer, composed of either a polymer, metal, or even atomically thin graphene, between the substrate and the brittle thin film...
March 2, 2017: Scientific Reports
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