keyword
MENU ▼
Read by QxMD icon Read
search

Physical Chemistry

keyword
https://www.readbyqxmd.com/read/28813014/antibacterial-properties-of-nonwoven-wound-dressings-coated-with-manuka-honey-or-methylglyoxal
#1
Sophie E L Bulman, Giuseppe Tronci, Parikshit Goswami, Chris Carr, Stephen J Russell
Manuka honey (MH) is used as an antibacterial agent in bioactive wound dressings via direct impregnation onto a suitable substrate. MH provides unique antibacterial activity when compared with conventional honeys, owing partly to one of its constituents, methylglyoxal (MGO). Aiming to investigate an antibiotic-free antimicrobial strategy, we studied the antibacterial activity of both MH and MGO (at equivalent MGO concentrations) when applied as a physical coating to a nonwoven fabric wound dressing. When physically coated on to a cellulosic hydroentangled nonwoven fabric, it was found that concentrations of 0...
August 16, 2017: Materials
https://www.readbyqxmd.com/read/28808678/interest-in-stem-is-contagious-for-students-in-biology-chemistry-and-physics-classes
#2
Zahra Hazari, Geoff Potvin, Jennifer D Cribbs, Allison Godwin, Tyler D Scott, Leidy Klotz
We report on a study of the effect of peers' interest in high school biology, chemistry, and physics classes on students' STEM (science, technology, engineering, and mathematics)-related career intentions and course achievement. We define an interest quorum as a science class where students perceive a high level of interest for the subject matter from their classmates. We hypothesized that students who experience such an interest quorum are more likely to choose STEM careers. Using data from a national survey study of students' experiences in high school science, we compared the effect of five levels of peer interest reported in biology, chemistry, and physics courses on students' STEM career intentions...
August 2017: Science Advances
https://www.readbyqxmd.com/read/28808262/generation-of-broadband-ultraviolet-frequency-entangled-photons-using-cavity-quantum-plasmonics
#3
Hisaki Oka
Application of quantum entangled photons is now extending to various fields in physics, chemistry and biology. In particular, in terms of application to molecular science, broadband ultraviolet frequency-entangled photons are desired because molecules inducing photochemical reactions of interest often have electronic transition energies in the ultraviolet region. Recent standard method for generating such entangled photons is a chirped quasi-phase-matching method, however this method is not suitable for the generation of ultraviolet frequency-entangled photons because it requires down-conversion of a photon with a wavelength shorter than ultraviolet into an entangled photon pair...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28808257/stochastic-model-of-contact-inhibition-and-the-proliferation-of-melanoma-in-situ
#4
Mauro César Cafundó Morais, Izabella Stuhl, Alan U Sabino, Willian W Lautenschlager, Alexandre S Queiroga, Tharcisio Citrangulo Tortelli, Roger Chammas, Yuri Suhov, Alexandre F Ramos
Contact inhibition is a central feature orchestrating cell proliferation in culture experiments; its loss is associated with malignant transformation and tumorigenesis. We performed a co-culture experiment with human metastatic melanoma cell line (SKMEL- 147) and immortalized keratinocyte cells (HaCaT). After 8 days a spatial pattern was detected, characterized by the formation of clusters of melanoma cells surrounded by keratinocytes constraining their proliferation. In addition, we observed that the proportion of melanoma cells within the total population has increased...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28799656/review-of-the-effects-of-manufactured-nanoparticles-on-mammalian-target-organs
#5
REVIEW
Tianshu Wu, Meng Tang
Nanotechnology had matured significantly during the last two decades as it has transitioned from bench top science to applied technology. Even though the issue of safety of nanotechnology has been raised nearly one decade ago, the rapid progress in development and use of nanomaterials has not yet been matched by toxicological investigations. Many recent studies have simply outlined the toxic effects of nanoparticles (NPs), but few have systematically addressed their potentially adverse biological effects on target organs...
August 11, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28797705/effects-of-hiv-1-gp41-derived-virucidal-peptides-on-virus-like-lipid-membranes
#6
Pablo Carravilla, Antonio Cruz, Itziar Martin-Ugarte, Itziar R Oar-Arteta, Johanna Torralba, Beatriz Apellaniz, Jesús Pérez-Gil, José Requejo-Isidro, Nerea Huarte, José L Nieva
Membrane fusion induced by the envelope glycoprotein enables the intracellular replication of HIV-1; hence, this process constitutes a major target for antiretroviral compounds. It has been proposed that peptides having propensity to interact with membrane interfaces might exert broad antiviral activity against enveloped viruses. To test this hypothesis, in this contribution we have analyzed the antiviral effects of peptides derived from the membrane-proximal external region and the transmembrane domain of the envelope glycoprotein subunit gp41, which display different degrees of interfacial hydrophobicity...
August 7, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28795495/thiol-ene-click-reaction-as-a-facile-and-general-approach-for-surface-functionalization-of-colloidal-nanocrystals
#7
Bin Liu, Xiaoran Deng, Zhongxi Xie, Ziyong Cheng, Piaoping Yang, Jun Lin
Oleic acid (OA) and/or oleylamine (OAm) are generally used as the surface ligands for stabilization of inorganic nanocrystals (NCs). The hydrophobic and inert surface of the NCs limits their applications such as in biomedical areas. Hence, surface modifications are essential in many physical and chemical processes. Here, a facile and versatile strategy is reported for the modification of NCs by ultraviolet-induced thiol-ene chemistry, in which thiol-terminated poly(ethylene glycol) (HSPEG) and its derivatives can react directly with double bonds in OA/OAm ligands to form covalent linking within one step...
August 10, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28793839/roughness-and-hydrophilicity-as-osteogenic-biomimetic-surface-properties
#8
Barbara Boyan, Ethan Major Lotz, Zvi Schwartz
Successful dental and orthopaedic implant outcomes are determined by the degree of osseointegration. Over the last 60 years, endosseous implants have evolved to stimulate osteogenesis without the need for exogenous biologics like bone morphogenetic proteins. An understanding of the interaction between cells and how cells interact with the physical features characteristics of their environments have has led to the development ofse bioactive implants. Implant surfaces that mimic the inherent chemistry, topography, and hydrophilicity wettability of native bone have been shown to provide cells in the osteoblast lineage cells with the structural cues to promote tissue regeneration and net new bone formation...
August 10, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28793009/nonylphenol-properties-legislation-toxicity-and-determination
#9
Frederico G DE Araujo, Glauco F Bauerfeldt, Yara Peluso Cid
This paper aims to gather and discuss important information about nonylphenol, such as physical chemistry properties, toxicity and analytical methods in various matrices. As a degradation product of ethoxylated alkylphenols, nonylphenol presents a higher degree of reactivity than its precursor. Due to its harmful effects on the environment, use and production of nonylphenol has been banned in European Union countries, alongside their precursors. The guide on quality of drinking water (USEPA) recommends a maximum concentration of 28 µg L-1 for fresh water...
August 7, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28792143/significance-of-neutrophil-to-lymphocyte-ratio-as-a-novel-indicator-of-spontaneous-ureter-stone-passage
#10
Kwang Suk Lee, Jee Soo Ha, Kyo Chul Koo
PURPOSE: Stone size and location are generally considered the most important factors associated with spontaneous ureter stone passage (SSP). Several parameters related to inflammatory changes have been identified as predictors associated with SSP. Our aim was to investigate the predictive role of neutrophil-to-lymphocyte ratio (NLR) for SSP. MATERIALS AND METHODS: A retrospective review was performed on 131 patients who were referred to the urology outpatient clinic and diagnosed with unilateral ureteral stones at our emergency department between July 2016 and December 2016...
September 2017: Yonsei Medical Journal
https://www.readbyqxmd.com/read/28783241/in-situ-transmission-electron-microscopy-characterization-and-manipulation-of-two-dimensional-layered-materials-beyond-graphene
#11
REVIEW
Chen Luo, Chaolun Wang, Xing Wu, Jian Zhang, Junhao Chu
Two-dimensional (2D) ultra-thin materials beyond graphene with rich physical properties and unique layered structures are promising for applications in electronics, chemistry, energy, and bioscience, etc. The interaction mechanisms among the structures, chemical compositions and physical properties of 2D layered materials are critical for fundamental nanosciences and the practical fabrication of next-generation nanodevices. Transmission electron microscopy (TEM), with its high spatial resolution and versatile external fields, is undoubtedly a powerful tool for the static characterization and dynamic manipulation of nanomaterials and nanodevices at the atomic scale...
August 7, 2017: Small
https://www.readbyqxmd.com/read/28780961/natural-and-bioinspired-nanostructured-bactericidal-surfaces
#12
REVIEW
Abinash Tripathy, Prosenjit Sen, Bo Su, Wuge H Briscoe
Bacterial antibiotic resistance is becoming more widespread due to excessive use of antibiotics in healthcare and agriculture. At the same time the development of new antibiotics has effectively ground to a hold. Chemical modifications of material surfaces have poor long-term performance in preventing bacterial build-up and hence approaches for realising bactericidal action through physical surface topography have become increasingly important in recent years. The complex nature of the bacteria cell wall interactions with nanostructured surfaces represents many challenges while the design of nanostructured bactericidal surfaces is considered...
July 27, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28779765/profragrance-chemistry-as-an-interdisciplinary-research-area-and-key-technology-for-fragrance-delivery
#13
Andreas Herrmann
Profragrances or properfumes are important delivery systems for the controlled release of volatile compounds. They constitute an essential part of a series of commercial body care and household products to ensure the long-lastingness of perfume perception in practical application. Fragrances are released from their respective precursors by covalent bond cleavage under mild environmental conditions. Originating from organic chemistry, modern profragrance research has evolved to a truly interdisciplinary research area covering supramolecular science, physical chemistry, analytical chemistry and various aspects of materials science...
August 9, 2017: Chimia
https://www.readbyqxmd.com/read/28777567/inorganic-nanotubes-and-fullerene-like-nanoparticles-at-the-crossroad-between-solid-state-chemistry-and-nanotechnology
#14
Bojana Višić, Leela S Panchakarla, Reshef Tenne
Inorganic nanotubes and fullerene-like nanoparticles of WS2 were discovered some 25 years ago and are produced now on a commercial scale for various applications. This "Perspective" is dedicated to a brief description of recent progress in this scientific discipline. The conceptual evolution leading to their discovery, is briefly discussed. Subsequently, the recent progress with the synthesis of such nanoparticles from variety of inorganic compounds with layered (2D) structure is described. In particular, the synthesis of nanotubes from chalcogenide- and oxide-based ternary misfit layered compounds is discussed as well as their structure and different growth-mechanisms...
August 4, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28777550/controlled-isotropic-and-anisotropic-shell-growth-in-%C3%AE-nalnf4-nanocrystals-induced-by-precursor-injection-rate
#15
Stefan Fischer, Joseph K Swabeck, A Paul Alivisatos
Precise morphology and composition control is vital for designing multifunctional lanthanide-doped core/shell nanocrystals. Herein, we report controlled isotropic and anisotropic shell growth technique in hexagonal sodium rare-earth tetra-fluoride (β-NaLnF4) nanocrystals by exploiting the kinetics of the shell growth. A drastic change of the shell morphology was observed by changing the injection rate of the shell precursors while keeping all other reaction conditions constant. We obtained isotropic shell growth for fast sequential injection and a preferred growth of the shell layers along the crystal's c-axis [001] for slow dropwise injection...
August 4, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28776234/combination-of-antibody-coated-physical-based-microfluidic-chip-with-wave-shaped-arrays-for-isolating-circulating-tumor-cells
#16
Hongmei Chen, Baoshan Cao, Hongda Chen, Yu-Sheng Lin, Jingjing Zhang
Circulating tumor cells (CTCs) are found in the peripheral blood of patients with metastatic cancers, which have critical significance in cancer prognosis and diagnostics. Enumeration is significantly valuable since number of CTCs is strongly correlated to severity of disease. This article is proposed and demonstrated an antibody-coated, size-based microfluidic chip with wave-shaped arrays could efficiently capture CTCs combining two separation methods of both size- and deformability-based and affinity-based segregation...
September 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28776014/new-tricks-of-the-trade-for-crystal-structure-refinement
#17
Jinjin Li, Yuriy A Abramov, Michael F Doherty
Accurate crystal structures and their experimental uncertainties, determined by X-ray diffraction/neutron diffraction techniques, are vital for crystal engineering studies, such as polymorph stability and crystal morphology calculations. Because of differences in crystal growth and data measurement conditions, crystallographic databases often contain multiple entries of varying quality of the same compound. The choice of the most reliable and best quality crystal structure from many very similar structures remains an unresolved problem, especially for nonexperts...
July 26, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28773856/antibacterial-metallic-touch-surfaces
#18
REVIEW
Victor M Villapún, Lynn G Dover, Andrew Cross, Sergio González
Our aim is to present a comprehensive review of the development of modern antibacterial metallic materials as touch surfaces in healthcare settings. Initially we compare Japanese, European and US standards for the assessment of antimicrobial activity. The variations in methodologies defined in these standards are highlighted. Our review will also cover the most relevant factors that define the antimicrobial performance of metals, namely, the effect of humidity, material geometry, chemistry, physical properties and oxidation of the material...
August 29, 2016: Materials
https://www.readbyqxmd.com/read/28773811/synthesis-of-acylated-xylan-based-magnetic-fe%C3%A2-o%C3%A2-hydrogels-and-their-application-for-h%C3%A2-o%C3%A2-detection
#19
Qing-Qing Dai, Jun-Li Ren, Feng Peng, Xiao-Feng Chen, Cun-Dian Gao, Run-Cang Sun
Acylated xylan-based magnetic Fe₃O₄ nanocomposite hydrogels (ACX-MNP-gels) were prepared by fabricating Fe₃O₄ nanoctahedra in situ within a hydrogel matrix which was synthesized by the copolymerization of acylated xylan (ACX) with acrylamide and N-isopropylacrylamide under ultraviolet irradiation. The size of the Fe₃O₄ fabricated within the hydrogel matrix could be adjusted through controlling the crosslinking concentrations (C). The magnetic hydrogels showed desirable magnetic and mechanical properties, which were confirmed by XRD, Raman spectroscopy, physical property measurement system, SEM, TGA, and compression test...
August 11, 2016: Materials
https://www.readbyqxmd.com/read/28773226/on-critical-states-rupture-states-and-interlocking-strength-of-granular-materials
#20
Chris M Szalwinski
The Mohr-Coulomb theory of strength identifies cohesion and internal friction as the two principal contributions to the shear strength of a granular material. The contribution of cohesion in over-compacted granular materials has been challenged and replacing cohesion with interlocking has been proposed. A theory of rupture strength that includes interlocking is derived herein. The physics-chemistry concept of critical state is elaborated to accommodate granular materials, based on empirical definitions established in the fields of soil mechanics and bulk solids' flow...
July 27, 2017: Materials
keyword
keyword
86147
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"