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https://www.readbyqxmd.com/read/28719862/green-biosynthesis-of-silver-nanoparticles-using-leaves-extract-of-artemisia-vulgaris-and-their-potential-biomedical-applications
#1
Tahir Rasheed, Muhammad Bilal, Hafiz M N Iqbal, Chuanlong Li
Biosynthesis of nanoparticles from plant extracts is receiving enormous interest due to their abundant availability and a broad spectrum of bioactive reducing metabolites. In this study, the reducing potential of Artemisia vulgaris leaves extract (AVLE) was investigated for synthesizing silver nanoparticles without the addition of any external reducing or capping agent. The appearance of blackish brown color evidenced the complete synthesis of nanoparticles. The synthesized silver nanoparticles were characterized by UV-vis spectroscopy, scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscope (TEM), atomic force microscopy (AFM) and Fourier transforms infrared spectroscopy (FT-IR) analysis...
July 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28719860/liposome-modified-titanium-surface-a-strategy-to-locally-deliver-bioactive-molecules
#2
Vincenzo De Leo, Monica Mattioli-Belmonte, Maria Teresa Cimmarusti, Annamaria Panniello, Manuela Dicarlo, Francesco Milano, Angela Agostiano, Elvira De Giglio, Lucia Catucci
Titanium and its alloys are widely employed materials for implants in orthopedic or dental surgery due to their mechanical properties, resistance to corrosion and osseointegration capability. However adverse reactions at the tissue/implant interface may occur, which limit the success of the osseointegration process. Therefore, different strategies have to be used to overcome these drawbacks. In this work, we developed two different liposome-based coatings on titanium surfaces as drug or bioactive molecule deposits for dental/orthopedic implant applications...
July 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28719847/high-photocatalytic-activity-of-hierarchical-sio2-c-doped-tio2-hollow-spheres-in-uv-and-visible-light-towards-degradation-of-rhodamine-b
#3
Ying Zhang, Juanrong Chen, Li Hua, Songjun Li, Xuanxuan Zhang, Weichen Sheng, Shunsheng Cao
Ongoing research activities are targeted to explore high photocatalytic activity of TiO2-based photocatalysts for the degradation of environmental contaminants under UV and visible light irradiation. In this work, we devise a facile, cost-effective technique to in situ synthesize hierarchical SiO2@C-doped TiO2 (SCT) hollow spheres for the first time. This strategy mainly contains the preparation of monodisperse cationic polystyrene spheres (CPS), sequential deposition of inner SiO2, the preparation of the sandwich-like CPS@SiO2@CPS particles, and formation of outer TiO2...
July 10, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28719741/macroscopic-strain-induced-transition-from-quasi-infinite-gold-nanoparticle-chains-to-defined-plasmonic-oligomers
#4
Anja Maria Steiner, Martin Mayer, Maximilian Seuss, Svetoslav Nikolov, Kenneth D Harris, Alexander Alexeev, Christian Kuttner, Tobias A F Koenig, Andreas Fery
We investigate the formation of chains of few plasmonic nanoparticles - so called plasmonic oligomers - by strain induced fragmentation of linear particle assemblies. Detailed investigations of the fragmentation process are conducted by in-situ atomic force microscopy (AFM) and UV-vis-NIR spectroscopy. Based on these experimental results and mechanical simulations computed by the lattice spring model (LSM), we propose a formation mechanism which explains the observed decrease of chain polydispersity upon increasing strain and provides experimental guidelines for tailoring chain length distribution...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719648/oligo-ethylene-glycol-sidechain-microgels-prepared-in-absence-of-cross-linking-agent-polymerization-characterization-and-variation-of-particle-deformability
#5
Nicole Welsch, L Andrew Lyon
We present a systematic study of self-cross-linked microgels formed by precipitation polymerization of oligo ethylene glycol methacrylates. The cross-linking density of these microgels and, thus, the network flexibility can be easily tuned through the modulation of the reaction temperature during polymerization. Microgels prepared in absence of any difunctional monomer, i.e. cross-linker, show enhanced deformability and particle spreading on solid surfaces as compared to microgels cross-linked with varying amounts of poly(ethylene glycol diacrylate) (PEG-DA) in addition to self-crosslinking...
2017: PloS One
https://www.readbyqxmd.com/read/28719589/an-excited-state-underlies-gene-regulation-of-a-transcriptional-riboswitch
#6
Bo Zhao, Sharon L Guffy, Benfeard Williams, Qi Zhang
Riboswitches control gene expression through ligand-dependent structural rearrangements of the sensing aptamer domain. However, we found that the Bacillus cereus fluoride riboswitch aptamer adopts identical tertiary structures in solution with and without ligand. Using chemical-exchange saturation transfer (CEST) NMR spectroscopy, we revealed that the structured ligand-free aptamer transiently accesses a low-populated (∼1%) and short-lived (∼3 ms) excited conformational state that unravels a conserved 'linchpin' base pair to signal transcription termination...
July 17, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28719379/critical-evaluation-of-metallization-in-electric-injury
#7
Sigitas Laima, Jana Bytautaite, Sigitas Chmieliauskas, Dmitrij Fomin, Algimantas Jasulaitis, Arturas Jukna, Sandra Mazeikiene, Jurgita Stasiuniene
The article presents 3 forensic medicine cases in the field of electric injury. In addition to traditional findings in electric injury (electric mark and histological findings), the forensic medicine experts in Lithuania also perform an atomic absorption spectrometry analysis. This method confirms the effects of electric current to the body through the electric conductor. Typical macroscopic finding in the skin is electric mark. Histologically, the damaged skin possesses characteristic features of thermal burns...
July 18, 2017: American Journal of Forensic Medicine and Pathology
https://www.readbyqxmd.com/read/28719217/single-molecule-study-on-polymer-nanoparticle-interactions-the-particle-shape-matters
#8
Zhandong Li, Bin Zhang, Yu Song, Yurui Xue, Lixin Wu, Wenke Zhang
The study on the nanoparticle-polymer interactions is very important for the design/preparation of high performance polymer nanocomposite. Here we present a method to quantify the polymer-particle interaction at single molecule level by using AFM-based single molecule force spectroscopy (SMFS). As a proof-of-concept study, we choose Poly-L-Lysine (PLL) as the polymer and several different types of polyoxometalates (POM) as the model particles to construct several different polymer nanocomposites and to reveal the binding mode and quantify the binding strength in these systems...
July 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28719214/tunable-liquid-resistant-tip-enhanced-raman-spectroscopy-probes-towards-label-free-nano-resolved-imaging-of-biological-systems
#9
Jacob D Scherger, Mark David Foster
Tip enhanced Raman spectroscopy (TERS) has been established as a powerful, non-invasive technique for chemical identification at the nano-scale. However, difficulties, including the degradation of probes, limit its use in liquid systems. Here TERS probes for studies in aqueous environments have been demonstrated using Titanium Nitride coatings with an alumina protective layer. The probes show enhancement in signal intensity as high as 380% in liquid measurements and the probe resonance can be tuned by varying deposition conditions to optimize performance for different laser sources and types of samples...
July 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28719195/fluorinated-boronic-acid-appended-pyridinium-salts-and-19f-nmr-spectroscopy-for-diol-sensing
#10
Jörg Axthelm, Sven H C Askes, Martin Elstner, Upendar Reddy Gandra, Helmar Görls, Peter Bellstedt, Alexander Schiller
The identification and discrimination of diols is of fundamental importance in medical diagnostics, such as measuring the contents of glucose in the urine of diabetes patients. Diol sensors are often based on fluorophore-appended boronic acids, but these severely lack discrimination power and their response is one-dimensional. As an alternative strategy, we present the use of fluorinated boronic acid-appended pyridinium salts in combination with 19F NMR spectroscopy. A pool of 59 (bio)analytes was screened, containing monosaccharides, phosphorylated and N-acetylated sugars, polyols, carboxylic acids, nucleotides and amines...
July 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28719176/investigation-on-the-electrocatalytic-determination-and-photocatalytic-degradation-of-neurotoxicity-drug-clioquinol-by-sn-moo4-2-nanoplates
#11
Raj Karthik, Jeyaraj Vinoth Kumar, Shen-Ming Chen, Kumar Seerangan, Chelladurai Karuppiah, Tse Wei Chen, Velluchamy Muthuraj
Transition metal molybdates have concerned enormous curiosity as supercapacitors, photocatalysts and electrocatalysts. These materials are best alternative to noble metal based catalysts which are generally show a limited photocatalytic and electrocatalytic activity. As well, the anti-protozoal drug can usually pollute the environment through improper disposable/incomplete metabolism and it is very dangerous to the human as well as aquatic animals. Therefore, here, we have studied the electrochemical determination and photodegradation of neurotoxicity clioquinol (CQL) drug by nanoplates-like tin molybdate (Sn(MoO4)2; denoted as SnM), which is played as both electro and photocatalyst...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28719146/natural-compounds-in-cancer-prevention-effects-of-coffee-extracts-and-their-main-polyphenolic-component-5-cqa-on-oncogenic-ras-proteins
#12
Alessandro Palmioli, Carlotta Cairamelli, Renata Tisi, Michela Spinelli, Gaia De Sanctis, Elena Sacco, Cristina Airoldi
Recent epidemiological studies demonstrate that consumption of healthy foods, especially rich in polyphenols content, might reduce the incidence of cancer and degenerative diseases. In particular, chlorogenic acids (CGAs) occur ubiquitously in food, representing the most abundant polyphenols in the human diet. A number of CGA beneficial biological effects, including anti-inflammatory activity, anti-carcinogenic activity and protection against neurodegenerative diseases have been reported. However, the molecular mechanisms at the basis of these biological activities have not yet been investigated in depth...
July 18, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28719145/preparation-of-carbon-dot-based-ratiometric-fluorescent-probes-for-cellular-imaging-from-curcuma-longa
#13
Zihnil Adha Islamy Mazrad, Eun Bi Kang, Insik In, Sung Young Park
This work derived biocompatible and stable probes based on fluorescent nanoparticles (FNPs) from a natural source, Curcuma longa. The multi-color fluorescence emissions from carbonized Curcuma longa (C-FNPs) obtained through defined dehydration conditions are soluble in water and have a small particle size (~17 nm). The surface passivation with polyethylene glycol (PEG) capped with amine groups in FNPs (P-FNPs) generated a probe with a higher quantum yield and longer fluorescence lifetime than obtained with C-FNPs...
July 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28719004/development-of-new-supramolecular-lyotropic-liquid-crystals-and-their-application-as-alignment-media-for-organic-compounds
#14
Martin Leyendecker, Nils-Christopher Meyer, Christina Thiele
Most alignment media for the residual dipolar coupling (RDC) based molecular structure determination of small organic compounds consist of rod-like polymers dissolved in organic solvents or of swollen cross-linked polymer gels. So far the synthesis of polymer based alignment media is a challenging process which is often followed by a time consuming sample preparation. We propose the use of non-polymeric alignment media based on benzene-tricarboxamides (BTA) which self-assemble into rod-like supramolecules. Our newly found supramolecular lyotropic liquid crystals (LLC) are characterized for LLC properties and their suitability as alignment medium in NMR spectroscopy...
July 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28718979/in-situ-two-step-photoreduced-sers-materials-for-on-chip-single-molecule-spectroscopy-with-high-reproducibility
#15
Wenjie Yan, Longkun Yang, Jianing Chen, Yaqi Wu, Peijie Wang, Zhipeng Li
A method is developed to synthesize surface-enhanced Raman scattering (SERS) materials capable of single-molecule detection, integrated with a microfluidic system. Using a focused laser, silver nanoparticle aggregates as SERS monitors are fabricated in a microfluidic channel through photochemical reduction. After washing out the monitor, the aggregates are irradiated again by the same laser. This key step leads to full reduction of the residual reactants, which generates numerous small silver nanoparticles on the former nanoaggregates...
July 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28718847/effect-of-pretreatment-severity-on-the-cellulose-and-lignin-isolated-from-salix-using-ionosolv-pretreatment
#16
Lisa Weigand, Shahrokh Mostame, Agnieszka Brandt-Talbot, Tom Welton, Jason P Hallett
The ionoSolv pretreatment is a new technique employing protic low-cost ionic liquids and has previously been applied to successfully fractionate switchgrass and the grass Miscanthus giganteus. This study investigates the effect of using the protic ionic liquid solution [N2220][HSO4]80% with two different acid/base ratios (1.02 and 0.98) at 120, 150 and 170 °C on the pretreatment outcome of the hardwood willow. The ionic liquid solution was able to fractionate willow, and a pulp and lignin fraction were recovered after treatment...
July 18, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28718814/physiological-effects-of-touching-wood
#17
Harumi Ikei, Chorong Song, Yoshifumi Miyazaki
This study aimed to clarify the physiological effects of touching wood with the palm, in comparison with touching other materials on brain activity and autonomic nervous activity. Eighteen female university students (mean age, 21.7  ±  1.6 years) participated in the study. As an indicator of brain activity, oxyhemoglobin (oxy-Hb) concentrations were measured in the left/right prefrontal cortex using near-infrared time-resolved spectroscopy. Heart rate variability (HRV) was used as an indicator of autonomic nervous activity...
July 18, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28718789/flavonoid-and-antioxidant-capacity-of-propolis-prediction-using-near-infrared-spectroscopy
#18
Eddy Betances-Salcedo, Isabel Revilla, Ana M Vivar-Quintana, M Inmaculada González-Martín
The use of propolis as a dietary supplement or as an ingredient in different food products is increasing, due to its antioxidant and bactericidal properties. These nutritional properties directly depend on its phenolic composition. For this reason, this study analysed the total contents of flavones and flavonols, flavanones and dihydroflavonols, and the antioxidant capacity by using the methods of ABTS and linoleic acid/β-carotene in 99 samples of propolis from Spain and Chile. A rapid method was developed for quantifying these parameters in raw propolis using near infrared (NIR) spectroscopy with a remote reflectance fibre-optic probe applied directly to the ground-up sample...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718785/uv-surface-treatment-of-fungal-resistant-polyether-polyurethane-film-induced-growth-of-entomopathogenic-fungi
#19
Gabriela Albara Lando, Letícia Marconatto, Felipe Kessler, William Lopes, Augusto Schrank, Marilene Henning Vainstein, Daniel Eduardo Weibel
Synthetic polymers are the cause of some major environmental impacts due to their low degradation rates. Polyurethanes (PU) are widely used synthetic polymers, and their growing use in industry has produced an increase in plastic waste. A commercial polyether-based thermoplastic PU with hydrolytic stability and fungus resistance was only attacked by an entomopathogenic fungus, Metarhiziumanisopliae, when the films were pre-treated with Ultraviolet (UV) irradiation in the presence of reactive atmospheres. Water contact angle, Fourier transform infrared spectroscopy in attenuated total reflection mode (FTIR-ATR), scanning electron microscopy (SEM), and profilometer measurements were mainly used for analysis...
July 18, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28718784/investigation-of-the-effect-of-the-degree-of-processing-of-radix-rehmanniae-preparata-shu-dihuang-on-shu-dihuangtan-carbonization-preparation-technology
#20
Xianglong Meng, Meijing He, Rui Guo, Rui Duan, Fengxian Huo, Chenzi Lv, Bo Wang, Shuosheng Zhang
Carbonization of Radix Rehmanniae Preparata (Shu Dihuangtan) via stir-frying could increase its homeostasis maintaining and antidiarrheal effects. To ensure these pharmacological functions, the quality of the raw material (processed Rehmanniae Radix) must be well controlled. Therefore, we analyzed the effects of different degrees of processing and adjuvants on processed Rehmanniae Radix (Shu Dihuang) by High Performance Liquid Chromatography (HPLC) chromatographic fingerprints, thermal gravimetric analysis and Fourier transform infrared spectroscopy (FTIR)...
July 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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