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https://read.qxmd.com/read/30786204/adsorption-desorption-and-crystallization-of-aqueous-solutions-in-nanopores
#1
Piyush Jain, Olivier Vincent, Abraham Duncan Stroock
Probing nano-confined solutions in tortuous, mesoporous media is challenging due to pore size, complex pore connectivity, and coexistence of multiple components and phases. Here, we use optical reflectance to experimentally investigate the wetting and drying of a mesoporous medium with ~3 nm diameter pores containing aqueous solutions of sodium chloride and lithium chloride. We show that the vapor activities, i.e., relative humidities, that correspond to optical features in the isotherms for solutions can be used to deduce the thermodynamic state of a nanoscopic solution that undergoes evaporation and crystallization upon drying, and condensation and deliquescence when increasing the relative humidity...
February 20, 2019: Langmuir: the ACS Journal of Surfaces and Colloids
https://read.qxmd.com/read/30785750/on-the-molecular-interactions-in-lipid-bilayer-water-assemblies-of-different-curvature
#2
Martynas Talaikis, Maria Valldeperas, Ieva Matulaitiene, Jekaterina Latynis Borzova, Justas Barauskas, Gediminas Niaura, Tommy Nylander
This work concerns the importance of the type of intermolecular interactions present in aqueous lipid-assembly systems depending on the type of aggregates they form. We have studied aqueous mixtures of diglycerolmonooleate (DGMO), Capmul glycerolmonooleate (GMO-50) and polyoxyethylene (20) sorbitanmonooleate (Polysorbate 80, P80) using small angle X-ray scattering measurements to reveal the structure of liquid crystalline phases. Based on SAXS data a phase diagram was constructed. We discuss the effect of curvature changes of the lipid-aqueous interface obtained by changing the water content and the temperature...
February 20, 2019: Journal of Physical Chemistry. B
https://read.qxmd.com/read/30785749/experimental-evidence-for-a-cluster-glass-transition-in-concentrated-lysozyme-solutions
#3
Maxime J Bergman, Tommy Garting, Peter Schurtenberger, Anna Stradner
Lysozyme is known to form equilibrium clusters at a pH≈7.8 and at low ionic strength as a result of a mixed potential. While this cluster formation and the related dynamic and static structure factors have been extensively investigated, its consequences on the macroscopic dynamic behavior expressed by the zero shear viscosity η0 remain controversial. Here we present results from a systematic investigation of η0 using two complementary passive microrheology techniques, dynamic light scattering based tracer microrheology, and multiple particle tracking using confocal microscopy...
February 20, 2019: Journal of Physical Chemistry. B
https://read.qxmd.com/read/30785152/zein-based-core-shell-microcapsules-for-the-potential-delivery-of-algae-oil-and-lipophilic-compounds
#4
Jia-Feng Chen, Xiao-Wei Chen, Jian Guo, Xiao-Quan Yang
Due to the benefits involving brain development and cardiovascular health, algae oil which is rich in omega-3 fatty acids has become a popular dietary supplement in recent years. However, the incompatibility with water and poor oxidative stability limits its addition in foods and beverages. In this work, the formation and characterization of zein-based core-shell microcapsules with tunable shell thicknesses for the potential delivery of algae oil were reported. They were prepared based on the in situ precipitation of zein from the continuous phase onto the surface of oil droplets by self-assembly at a refrigerated temperature without any need for surfactants and cross-linkers...
February 20, 2019: Food & Function
https://read.qxmd.com/read/30785147/v-shaped-active-plasmonic-meta-polymers
#5
Debrina Jana, Adarsh B Vasista, Harshvardhan Jog, Ravi P N Tripathi, Monica Allen, Jeffery Allen, G V Pavan Kumar
We report the design and fabrication of V-shaped plasmonic meta-polymers on a glass substrate or silicon wafer using a surface functionalization approach. The efficacy of the assembly method is examined by analyzing the surface enhanced Raman scattering by an individual V-shaped antenna experimentally and using computational simulations to determine the polarization dependence of local electromagnetic field enhancement.
February 20, 2019: Nanoscale
https://read.qxmd.com/read/30785041/food-additive-dye-quinoline-yellow-promotes-unfolding-and-aggregation-of-myoglobin-a-spectroscopic-and-molecular-docking-analysis
#6
Mohd Shahnawaz Khan, Md Tabish Rehman, Sheraz Ahmad Bhat, Shams Tabrez, Afzal Hussain, Fohad Mabood Husain, Mohamed F AlAjmi, Salman Freeh Alamery, Sadia Sumbul
Protein aggregation leads to vast conformational changes and plays a key role in the pathogenesis of various neurodegenerative diseases including Alzheimer's and Parkinson's. In the current piece of work, we have explored the interaction of quinoline yellow (QY) with myoglobin (Mb) at two different pH (3.5 and 7.4). Various spectroscopic techniques such as turbidity, Rayleigh light scattering (RLS), UV-Vis absorbance, fluorescence resonance energy transfer (FRET), far UV-CD along with transmission electron microscopy (TEM) and molecular docking have been utilized to characterize dye-induced aggregation in Mb...
February 13, 2019: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://read.qxmd.com/read/30785040/high-pressure-raman-scattering-of-dl%C3%A2-isoleucine-crystals-and-dft-calculations
#7
F S C Rêgo, F E A Melo, C E S Nogueira, A Polian, P T C Freire, P F Façanha Filho, J A Lima
DL‑isoleucine single crystals were grown by the slow evaporation method at ambient temperature. Their vibrational properties were studied at ambient temperature as a function of pressure by Raman scattering. At ambient conditions the mode assignment was done in terms of the Potential Energy Distribution (PED) through density functional theory calculations. Both nitrogen and neon were used as pressure transmitting media. The pressure-dependent investigation shows modifications in the Raman spectra recorded between 30 and 3200 cm-1 that were interpreted as phase transitions undergone by the crystal between 1...
January 31, 2019: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://read.qxmd.com/read/30785035/gold-nanoparticle-carboxymethyl-cellulose-nanocolloids-for-detection-of-human-immunodeficiency-virus-type-1-hiv-1-using-laser-light-scattering-immunoassay
#8
A J Caires, H S Mansur, A A P Mansur, S M Carvalho, Z I P Lobato, J K P Dos Reis
It is estimated that over 100 million people have been infected with human immunodeficiency virus (HIV-1) resulting in approximately 30 million deaths globally. Herein, we designed and developed novel nano-immunoconjugates using gold nanoparticles (AuNPs) and carboxymethylcellulose (CMC) biopolymer, which performed simultaneously as an eco-friendly in situ reducing agent and surface stabilizing ligand for the aqueous colloidal process. These AuNPs-CMC nanocolloids were biofunctionalized with the gp41 glycoprotein receptor (AuNPs-CMC-gp41) or HIV monoclonal antibodies (AuNPs-CMC_PolyArg-abHIV) for detection using the laser light scattering immunoassay (LIA)...
February 15, 2019: Colloids and Surfaces. B, Biointerfaces
https://read.qxmd.com/read/30784921/opuntioside-opuntiol-and-its-metallic-nanoparticles-attenuate-adjuvant-induced-arthritis-novel-suppressors-of-toll-like-receptors-2-and-4
#9
Talat Roome, Sabahat Aziz, Anam Razzak, Zara Aslam, Lubna, Khawar Saeed Jamali, Bushra Sikandar, Tehseen Fatima, Lubna Abidi, Muhammad Imran, Shaheen Faizi, Muhammad Raza Shah
Rheumatoid arthritis (RA) is a chronic autoimmune disease of synovial inflammation and joint destruction. This study reports anti-arthritic potential of opuntioside-I opuntiol, and its gold and silver nanoparticles (NPs) against Complete Freund's Adjuvant (CFA)-induced arthritic rats. The mechanistic studies were performed targeting TLRs (TLR-2 and TLR-4) and cytokines (IL-1β and TNF-α) expressions to validate their anti-inflammatory and immuno-modulatory response. The nano-formulations were successfully characterized employing Atomic Force Microscopy (AFM) and Dynamic Light Scattering (DLS) analysis...
February 20, 2019: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://read.qxmd.com/read/30784828/human-urogenital-myiasis-a-systematic-review-of-reported-cases-from-1975-to-2017
#10
REVIEW
Roghiyeh Faridnia, Masoud Soosaraei, Hamed Kalani, Mahdi Fakhar, Pikka Jokelainen, Reza Zolfaghari Emameh, Elham Sadat Banimostafavi, Hajar Ziaei Hezarjaribi
The public health importance of myiasis [infestation with dipterous (fly) larvae] remains unknown. This disease is spread worldwide in animals and humans, but baseline data on its prevalence are limited. In particular, knowledge on human urogenital myiasis (UGM) is scattered. As such, a systematic search was undertaken of five English and five Persian databases for publications describing UGM cases in English or Persian published between 1975 and 2017. In total, 45 papers reporting 59 UGM cases from various regions of the world are included in this review...
February 15, 2019: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://read.qxmd.com/read/30784753/multifunctional-magnetic-sphere-mos-2-au-hybrid-for-surface-enhanced-raman-scattering-detection-and-visible-light-photo-fenton-degradation-of-aromatic-dyes
#11
Huasheng Lai, Guangran Ma, Wenjuan Shang, Danjiao Chen, Yuyin Yun, Xia Peng, Fugang Xu
A ternary hybrid, MNPs-MoS2 @Au, composed of gold nanoparticles (AuNPs) grown on a magnetic sphere (MNPs)-MoS2 microflower composite (MNPs-MoS2 ) was proposed for surface-enhanced Raman scattering (SERS) detection and visible-light photo-Fenton degradation of aromatic dyes. The hybrid was prepared by sequential solvothermal growth of MNPs and MoS2 , and electroless deposition of AuNPs. A comparison of results revealed that the synergy among these components endowed the hybrid with a much higher SERS enhancement ability than MNPs, or MNPs@MoS2 ...
February 14, 2019: Chemosphere
https://read.qxmd.com/read/30784319/in-vitro-and-in-vivo-characterization-of-pharmaceutical-nanocarriers-used-for-drug-delivery
#12
Akhlesh K Jain, Suresh Thareja
Nanotechnology has emerged strongly in most of the field of sciences at a tiny scale. At this size, atoms and molecules work differently and present a diversity of amazing and appealing applications. Pharmaceutical nanocarriers comprise nanoparticles, nanospheres, nanocapsules, nanoemulsion, nanoliposomes and nanoniosomes. The major objectives in designing nanocarriers are to manage particle size, surface properties as well as drug release in order to fulfil specific objectives. Hence, characterizations of nanocarriers are very critical to control their desired in vitro and in vivo behaviour...
December 2019: Artificial Cells, Nanomedicine, and Biotechnology
https://read.qxmd.com/read/30783832/non-destructive-reflectance-mapping-of-collagen-fiber-alignment-in-heart-valve-leaflets
#13
Will Goth, Sam Potter, Alicia C B Allen, Janet Zoldan, Michael S Sacks, James W Tunnell
Collagen fibers are the primary structural elements that define many soft-tissue structure and mechanical function relationships, so that quantification of collagen organization is essential to many disciplines. Current tissue-level collagen fiber imaging techniques remain limited in their ability to quantify fiber organization at macroscopic spatial scales and multiple time points, especially in a non-contacting manner, requiring no modifications to the tissue, and in near real-time. Our group has previously developed polarized spatial frequency domain imaging (pSFDI), a reflectance imaging technique that rapidly and non-destructively quantifies planar collagen fiber orientation in superficial layers of soft tissues over large fields-of-view...
February 19, 2019: Annals of Biomedical Engineering
https://read.qxmd.com/read/30783263/publisher-correction-noninvasive-monitoring-of-single-cell-mechanics-by-acoustic-scattering
#14
Joon Ho Kang, Teemu P Miettinen, Lynna Chen, Selim Olcum, Georgios Katsikis, Patrick S Doyle, Scott R Manalis
The version of this paper originally published online contained an error in the x-axis of Fig. 2c: the LatB concentrations should be 0.4 and 1 μM, but during typesetting, the 1 μM label was incorrectly changed to 0.1 μM. The label is now correct in the print, PDF, and HTML versions of the paper. In addition, in the article's online Supplementary Information, Supplementary Video 2 was a duplicate of Supplementary Video 1. The correct versions of both videos are now available online.
February 19, 2019: Nature Methods
https://read.qxmd.com/read/30783166/irradiation-dependent-helium-gas-bubble-superlattice-in-tungsten
#15
D J Sprouster, C Sun, Y Zhang, S N Chodankar, J Gan, L E Ecker
The implantation of noble gas atoms into metals at high gas concentrations can lead to the self-organization of nanobubbles into superlattices with symmetry similar to the metal host matrix. Here, we examine the influence of implantation parameters on the formation and structure of helium gas bubble superlattices within a tungsten host matrix to uncover mechanistic insight into the formation process. The determination of the size and symmetry of the gas bubbles was performed using a combination of small angle x-ray scattering and transmission electron microscopy...
February 19, 2019: Scientific Reports
https://read.qxmd.com/read/30783130/transparent-display-using-a-quasi-array-of-si-sio-2-core-shell-nanoparticles
#16
Mahboubeh Dolatyari, Ali Jafari, Ali Rostami, Axel Klein
A novel type of transparent monitor with high-resolution images based on Si-SiO2 core-shell nanoparticles is presented in this contribution. In this monitor, a quasi-array of nanoparticles was used to obtain a very sharp scattering profile. For this purpose, the Si-SiO2 nanoparticles were synthesized and with controlling the size of particles, the dominant emission wavelength was controlled. For the fabrication of a blue color transparent monitor the solution processed Si-SiO2 nanoparticles were dispersed in polystyrene and then coated on a transparent glass surface...
February 19, 2019: Scientific Reports
https://read.qxmd.com/read/30783107/single-gold-bridged-nanoprobes-for-identification-of-single-point-dna-mutations
#17
Xingyi Ma, Sojin Song, Soohyun Kim, Mi-Sun Kwon, Hyunsook Lee, Wounjhang Park, Sang Jun Sim
Consensus ranking of protein affinity to identify point mutations has not been established. Therefore, analytical techniques that can detect subtle variations without interfering with native biomolecular interactions are required. Here we report a rapid method to identify point mutations by a single nanoparticle sensing system. DNA-directed gold crystallization forms rod-like nanoparticles with bridges based on structural design. The nanoparticles enhance Rayleigh light scattering, achieving high refractive-index sensitivity, and enable the system to monitor even a small number of protein-DNA binding events without interference...
February 19, 2019: Nature Communications
https://read.qxmd.com/read/30783095/non-monotonic-pressure-dependence-of-the-thermal-conductivity-of-boron-arsenide
#18
Navaneetha K Ravichandran, David Broido
Recent experiments demonstrate that boron arsenide (BAs) is a showcase material to study the role of higher-order four-phonon interactions in affecting heat conduction in semiconductors. Here we use first-principles calculations to identify a phenomenon in BAs and a related material - boron antimonide, that has never been predicted or experimentally observed for any other material: competing responses of three-phonon and four-phonon interactions to pressure rise cause a non-monotonic pressure dependence of thermal conductivity, κ, which first increases similar to most materials and then decreases...
February 19, 2019: Nature Communications
https://read.qxmd.com/read/30783084/strain-engineering-mott-insulating-la-2-cuo-4
#19
O Ivashko, M Horio, W Wan, N B Christensen, D E McNally, E Paris, Y Tseng, N E Shaik, H M Rønnow, H I Wei, C Adamo, C Lichtensteiger, M Gibert, M R Beasley, K M Shen, J M Tomczak, T Schmitt, J Chang
The transition temperature Tc of unconventional superconductivity is often tunable. For a monolayer of FeSe, for example, the sweet spot is uniquely bound to titanium-oxide substrates. By contrast for La2-x Srx CuO4 thin films, such substrates are sub-optimal and the highest Tc is instead obtained using LaSrAlO4 . An outstanding challenge is thus to understand the optimal conditions for superconductivity in thin films: which microscopic parameters drive the change in Tc and how can we tune them? Here we demonstrate, by a combination of x-ray absorption and resonant inelastic x-ray scattering spectroscopy, how the Coulomb and magnetic-exchange interaction of La2 CuO4 thin films can be enhanced by compressive strain...
February 19, 2019: Nature Communications
https://read.qxmd.com/read/30782822/compatibility-of-quantitative-x-ray-spectroscopy-with-continuous-distribution-models-of-water-at-ambient-conditions
#20
Johannes Niskanen, Mattis Fondell, Christoph J Sahle, Sebastian Eckert, Raphael M Jay, Keith Gilmore, Annette Pietzsch, Marcus Dantz, Xingye Lu, Daniel E McNally, Thorsten Schmitt, Vinicius Vaz da Cruz, Victor Kimberg, Faris Gel'mukhanov, Alexander Föhlisch
The phase diagram of water harbors controversial views on underlying structural properties of its constituting molecular moieties, its fluctuating hydrogen-bonding network, as well as pair-correlation functions. In this work, long energy-range detection of the X-ray absorption allows us to unambiguously calibrate the spectra for water gas, liquid, and ice by the experimental atomic ionization cross-section. In liquid water, we extract the mean value of 1.74 ± 2.1% donated and accepted hydrogen bonds per molecule, pointing to a continuous-distribution model...
February 19, 2019: Proceedings of the National Academy of Sciences of the United States of America
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