Polyvinyl alcohol (PVA) hydrogels have a wide range of applications in the pharmaceutical and biomedicine fields due to their exceptional biophysical properties. The study focuses on preparing characterizing capsule-shaped PVA enhance biocompatibility porosity for controlled glucose release cell proliferation. were prepared using different concentrations (Cs) molecular weights (MWs) PVA, with two lengths, A (10 mm) B (20 mm), control over 60 min. preparation process involved gel hydrogel...

The LiNbO(3) congruent crystals doped with small Nd concentrations, <1 mol% Nd, and co-doped Mg ions, 0-9 Mg, were systematically investigated by means of micro-Raman spectroscopy in the Y Z crystal directions. Results obtained from an undoped crystal, Nd-doped a Mg-doped Mg-co-doped are compared. From analyses results direction, content dependence two lowest-Raman A(1)(TO(1)) A(1)(TO(2)) modes, half-width composition area ratio A(1)(TO(4)) E(TO(8)) bands, we reached several conclusions...

Large-area, flexible, two-dimensional transition metal dichalcogenide semiconductor materials (MoS2 and WSe2) were synthesized via magnetron sputtering of amorphous stoichiometric precursor on polydimethylsiloxane polymer substrates. Purely with pre-existing nanocrystalline regions observed transmission electron microscopy grown for the studies presented here. The MoS2 WSe2 material precursors then illuminated a pulsed 532 nm laser to induce crystallization their semiconducting hexagonal...

Background: Triple-negative locally advanced breast cancer is an aggressive tumor type. Currently, the standard sequence treatment applied, administering anthracyclines first and then a taxane plus platinum. Clinical studies for all possible combinations are not practical or affordable, but mathematical modeling of active mitotic cell population possible. Our study aims to show regions with tumor’s most substantial cellular variation by utilizing values parameters αsi that define...

This study aims to analyze the physical-mechanical properties and dynamic models of tissue-simulating hydrogels, specifically photoacoustic (PA) response signals, by varying concentrations polyvinyl alcohol (PVA) molecular weight (MW). A state-space model (SSM) is proposed PVA hydrogels retrieve PA-related signal's damping ratio natural frequency. Nine box-shaped containing saline solution were used, with five (7, 9, 12, 15, 20%) for MW1 four MW2. The results indicated that concentration MW...

In this study, a simple method to determine the reflectance and transmittance of turbid media is proposed. The based on single integrating sphere system. theory used calculate under diffuse directional illumination, an experimental setup proposed measure these quantities. This was poly(vinyl alcohol) (PVA) hydrogels. Monte Carlo calculations were also implemented validate our results. comparison shows that optical properties obtained through propagate low values uncertainty, simpler than...

Visceral Adiposity Index (VAI) has been strongly associated with adipocytokine synthesis, proinflammatory activity, insulin resistance, dyslipidemia, hypertension and atherosclerosis. VAI is a model that includes correlates anthropometric metabolic markers proposed as risk factor index cardiovascular in adults. Some studies conducted pediatric population have extrapolated calculation order to predict these abnormalities; nonetheless, no adjustment done for ranges any of the variables...

Background Endoscopic ultrasound (EUS) and endoscopic elastography (EUS-E) simulation lessens the learning curve; however, models lack realism, diminishing competitiveness. Aim To standardize mechanical properties of polyvinyl alcohol (PVA) hydrogel for simulating organs digestive lesions. Methods PVA (Sigma Aldrich, degree hydrolysis 99%) EUS/EUS-E lesions was investigated in Unidad de Investigacion y Desarrollo Tecnologico at Hospital General Mexico Dr. Eduardo Liceaga, City. We evaluated...

The frailty syndrome is characterized by a decreased capacity to adequately respond stressors. One of the most impaired physiological systems autonomous nervous system, which can be assessed through heart rate (HR) variability (HRV) analysis. In this article, we studied chronotropic response (HR and HRV) walking test. We also analyzed HRV indices in rest as potential biomarkers frailty. For this, 160 m-walking test two standing tests (before after walking) were performed young (19–29 years...

Abstract The photoacoustic effect is an attractive tool for diagnosis in several biomedical applications. Analyzing signals, however, challenging to provide qualitative results automated way. In this work, we introduce a dynamic modeling scheme of sensor data classify blood samples according their physiological status. Thirty-five whole human were studied with state-space model estimated by subspace method. Furthermore, the are classified using parameters and linear discriminant analysis...

Technological advances allow the continuous monitoring of a wide variety physiological variables. Our recent results indicate that statistics resulting time series reflects dynamics underlying homeostatic regulation mechanisms. In present contribution, we explore role and may play in medical prognosis what their relation is to clinical prognostic scales are used practice. We hypothesize based on be more sensible, i.e., predict health risks an earlier state before appearance symptoms, but...

We present experimental results related to the manufacturing of phantoms based on polyvinyl-alcohol (PVA) mixedwith SiO2, graphite and Ag nanoparticles. These are dummy representations human tissue thebreast gland. focus our attention representation optical mechanical properties actualbiological healthy that representing a hidden cancer tumor (lesion). The quality samples is testedby ultrasonic imaging laser induced photothermal (PT) detection technique. From former test, mechanicalcontrast...

Photoacoustics is a promising technology in biomedicine. This work approaches data-driven method to analyze the underlying dynamics of photoacoustic signals. We show data workflow and promissory results test proposed technique.

Medical prognosis is based on symptoms, such as loss of functionality or a deviation the average value physiological parameters from their adequate homeostatic ranges. On other hand, alterations in regulation may precede appearance has been suggested geriatrics case age-associated frailty. Technological advances allow to monitor continuous and non-invasive way large variety variables it proposed that statistics resulting time series reflects dynamics these underlying regulatory processes....

Random lasers varying concentration and size of SiO2 scatterers were analyzed. We report on the dependence spectral features (wavelength full width at half maximum) scatterers.

Abstract: This study aims to analyze the physico-mechanical properties and dynamic models of tissue-simulating hydrogels, specifically photoacoustic (PA) response signals, by varying concentrations polyvinyl alcohol (PVA) molecular weight (MW). A state space model (SSM) is proposed PVA hydrogels retrieve PA-related signal&amp;#039;s damping ratio nat-ural frequency. Nine box-shaped containing saline solution were used, with five (7, 9, 12, 15, 20%) for MW1 four MW2. The results indicated...

Basados en el efecto fotoacústico pulsado, se desarrolló un dispositivo experimental para generar imágenesbidimensionales de muestras ópticamente opacas ocultas medio turbio. El turbio hizo agar ynanopartículas monodispersas, con estos materiales indujimos una absorción y esparcimiento óptico semejante al delos tejidos humanos. La señal PA genera por la óptica del muestra; vez producida viaja a travésdel esparsor. Las propiedades ópticas muestra así como forma éste definen amplitud formade...

Today, visual classification of the degree lipemia in blood samples is frequently performed clinical laboratories. However, achieving standardization this at low cost and with fewer resources an objective that still under development. In work, a comparison made between inspection optical measurements plasma for quantifying lipemia. The refractive index’s real part was measured using Abbe refractometer transmittance were 589 nm wavelength wavelengths ranging from 320 to 1100 spectral region,...

Most gait parameters decrease with age and are even more importantly reduced frailty. However, other exhibit different or opposite trends for aging frailty, the underlying reason is unclear. Literature focuses either on aging, a comprehensive understanding of how biomechanical regulation evolves frailty seems to be lacking. We monitored dynamics in young adults (19–29 years, n = 27, 59% women), middle-aged (30–59 16, 62% non-frail (&gt;60 15, 33% women) frail older 31, 71% during 160 m...