Tetrahydroxy-1,4-benzoquinone (THQ) is a highly redox-active substance that generates reactive oxygen species (ROS), which can induce apoptosis in cell culture experiments. The underlying mechanism for ROS production has previously been postulated to be the autoxidation of THQ rhodizonic acid (RhA). However, our results suggest cells detoxify by reducing it hexahydroxybenzene (HHB), catalyzed NADPH-quinone-oxidoreductase (NQO1). Then, HHB undergoes back THQ, closing redox cycle continuously...

The development of a device for generating ac magnetic fields based on resonant inverter is presented, which has been specially designed to carry out experiments hyperthermia. By determining the electric current in LC circuit, maximum intensity field around 15 mT calculated, with frequency 206 kHz. This able heat powdered materials embedded biological systems be used biomedical applications. Indeed, order evaluate sensitivity we also present measurements specific absorption rate phantoms...

This paper reports the sol-gel synthesis of Al2O3-Nd2O3 (Al-Nd-x; x = 5%, 10%, 15% and 25% Nd2O3) binary oxides photodegradation diclofenac activated by UV light. Al-Nd-based catalysts were analyzed N2 physisorption, XRD, TEM, SEM, UV-Vis PL spectroscopies. The inclusion Nd2O3 in aluminum oxide matrix 10-25% range reduced band gap energies from 3.35 eV for γ-Al2O3 to values as low 3.13-3.20 eV, which are typical semiconductor materials absorbing region. Al-Nd-x reached more than 92.0%...

Seven out of eight methanolic extracts from five plants native to Mexico were inactive against ten bacterial strains clinical interest. The fruit extract Chenopodium ambrosioides inhibited the bacteria Enterococcus faecalis (MIC = 4375 μg/ml), Escherichia coli 1094 and Salmonella typhimurium 137 μg/ml). C. was with CC50 45 μg/ml most cytotoxic cell-line Caco-2, followed by leaf Pithecellobium dulce (CC50 126 μg/ml); interestingly, leaves 563 μg/ml) bark P. 347 much less cytotoxic. We...

A description of the measurement procedure, related theory and experimental data analysis magnetic susceptibility materials is given. short review previous papers in line this subject presented. This work covers whole process, detail, presents a pragmatic approach for pedagogical sake.

A scanning system for specific absorption rate of ferrofluids with superparamagnetic nanoparticles is presented in this study. The contains an induction heating device designed and built a resonant inverter order to generate magnetic field amplitudes up 38 mT, over the frequency band 180-525 kHz. Its circuit involves variable capacitor 1 nF capacitance steps easily select desired frequency, reaching from 0.3 kHz/nF 5 resolution. performance characterized compare theoretical predictions...

Food industries typically use Aloe vera as concentrated (100× to 200×) and dried powders in their final products. These are obtained by extrusion of inner leaf gel (ILG) or whole (WLP); the juice is filtered through diatomaceous earth activated carbon before spray drying at temperatures below 70 °C. In another process, was ~80 °C mashed a powder rich high molecular weight fibres soluble polysaccharides (ILF). contrast ILG WLP, ILF sample cytotoxic for human intestinal cell line Caco-2 (CC50...

A ferrofluid with 1,2-Benzenediol-coated iron oxide nanoparticles was synthesized and physicochemically analyzed. This colloidal system prepared following the typical co-precipitation method, superparamagnetic of 13.5 nm average diameter, 34 emu/g magnetic saturation, 285 K blocking temperature were obtained. Additionally, zeta potential showed a suitable stability for cancer therapy assays magneto-calorimetric trails determined high power absorption density. In addition, oxidative...

In this work, the cell line SW620-GFP has been used in a complete magnetic hyperthermia assay, from preparation of ferrofluid with folate-coated iron oxide nanoparticles to vivo experiments. The physical and chemical characterization evidenced their superparamagnetic behaviour, an average diameter 12 ± 4 nm, 2 nm coat thickness, high-power loss density. main innovation work is exclusive capability viable cells emit fluorescence, enabling fast analysis both, viability vitro epifluorescence...

In this study, a frequency tuner system is developed for generating variable magnetic fields hyperthermia applications. The tuning device contains three specially designed phase lock loop devices that drive resonant inverter working in the band of 180–525 kHz. This can be adapted other inverters employed studies ferrofluids with superparamagnetic nanoparticles. performance whole also examined. Our findings were agreement theoretical expectations locking and tuning. tested samples solid...

An exhaustive characterization of the physicochemical properties gum arabic (GA)-coated Fe3O4 magnetic nanoparticles was conducted in this work. These were obtained via in-situ coprecipitation method (a fast single-step method) two GA:Fe ratios, 10:1 and 20:1, respectively. Several experimental techniques applied process, all them described below. Using Transmission Electron Microcopy images, they shown to have spherical-like morphology with 11 nm diameter. The Fourier Transform Infrared...

Aloe vera products, both in food and cosmetics, are becoming increasingly popular due to their claimed beneficial effects, which mainly attributed the active compound acemannan. Usually, these end products based on powdered starting materials. High temperatures during drying process obtain materials have several advantages, like shortening time, eliminating toxic aloin reducing bacterial contamination. Nevertheless, there two major drawbacks: first, at of 80 °C or higher, structural changes...

Abstract We report an experimental and theoretical study of magnetic properties synthetic eumelanin. The magnetization curves are determined by using both a vibrating sample magnetometer superconducting quantum interferometer device in extended range fields ranging from −10 kOe to 10 at different temperatures. find that the eumelanin can be qualitatively explained terms simple model dipolar spheres with intrinsic moment. latter one is experimentally measured X‐band electron paramagnetic...

A system for imaging magnetic surfaces using a magnetoresistive sensor array is developed. The experimental setup composed of linear 12 sensors uniformly spaced, with sensitivity 150 pT*Hz−1/2 at 1 Hz, and it able to scan an area (16 × 18) cm2 from separation 0.8 cm the sources resolution 0.3 cm. Moreover, point spread function multi-sensor also studied, in order characterize its transference improve quality restoration images. Furthermore, images are generated by mapping response due...

This study aims to present the design of a new soldering iron for welding electronic components that work via AC magnetic fields. Moreover, device has been designed operate in cordless mode. The system comprises resonant inverter is capable generating an alternating field 250 kHz center coil 11 wires. heating element cylindrical piece ferromagnetic stainless steel with concentric core copper, which maintained contact standard and commercial tip. Additionally, we determined power factor...

A scanning system developed for planar magnetic surfaces composed of a moving line three magnetoresistive ultrasensitive transducers, complemented by signal conditioning circuit is presented. After the calibration sensors, it was used to determine magnetized surface images with different shapes evaluate sensitivity device, and are represented in gray levels on scale from 0 255 intensities, get visual representation field strength. The device shown be sensitive enough detect gradients...

A multichannel scanning system for magnetic surface imaging composed of 16 magnetoresistive sensors has been developed. gray scale, from 0 to 255, was used represent the signal detected by each sensor when sample moved above scanner. Measurements and calibration were performed using surfaces with different shapes samples similar profiles, but magnetization intensities. The sufficiently sensitive detect gradients discontinuities on map. channel images numerically processed obtain a smooth...