Antioxidant therapy in hemodialysis patients

Cardiovascular problem is the major cause of mortality and morbidity in patients under hemodialysis for chronic kidney disease. Increased lipid peroxidation and depletion of chain-breaking antioxidants may be related to increased risk of atherosclerosis. Oxidative stress and acute phase inflammation are now defined to be highly prevalent in the hemodialysis patients, and several lines of evidence point to their contribution in atherosclerosis development. Antioxidants have been used as therapies to decrease oxidative stress and improve risk of cardiovascular diseases (CVD) in hemodialysis patients. However, plants and fruits antioxidants are reliable ones. Probably, because plants antioxidants are a mixture of several substances with antioxidant activity, which each one supports the other one

Simulative development of the electronic component of Mössbauer spectroscopy with a focus on the controllability of a 2nd order transimpedance amplifier

In light-processing systems, light energy is converted into a photocurrent due to the photoelectric effect. This project focuses on the development of a high-precision energy-to-voltage conversion technique to optimize signal processing in light-processing systems, specifically for applications in space analytics or solid state physikcs, such as Mössbauer spectroscopy. Analog circuit development plays a vital role as downstream voltage conversion is necessary for signal processing. The objective is to enhance the signal quality and improve the signal-to-noise ratio through the design, optimization, and comparison of various circuits for voltage conversion. The development process involves the design and optimization of amplifier circuits, supplemented with the incorporation of filters and/or regulators for further improvement. A transimpedance amplifier is approximated as a second-order low-pass filter, while a state controller is designed and analyzed to efficient transient oscillation of the system towards optimal amplitude values for subsequent signal processing. The project's results contribute to the advancement of light-processing systems, enabling more precise analysis of light energy in Mössbauer spectroscopy. The findings are presented in a series of scientific publications, showcasing the effectiveness of the developed circuits and their impact on signal quality. Future work could focus on further optimization and validation of the circuits in real-world applications to confirm their performance and reliability. Overall, this project emphasizes the significance of meticulous circuit development and optimization for enhancing signal processing in light-processing systems, thus supporting their application in space analytics

Effects of wind speed and water pressure on home sprinkler systems

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Pressing of Functionalized Polymer Composite Materials to Improve Mössbauer Measurement Signals

Coordination compounds, like iron(II) triazole complexes, exhibit spin crossover (SCO) behavior at around room temperature. Therefore, they are interesting for a variety of possible applications, and it is convenient to integrate them into polymers. Due to a reduction of the iron content and thus also 57Fe content in the sample through integration in polymers, Mössbauer measurements are only possible with greater difficulty or very long measurement times without expensive enrichment of the samples with 57Fe. So, other ways of improving the Mössbauer signal for these composite materials are necessary. Therefore, we pressed these composite materials to improve the Mössbauer spectra. In this study, we synthesized an iron(II) triazole spin crossover complex and an electrospun polymer complex composite nanofiber material including the same complex. For both products, Mössbauer measurements were performed at room temperature before and after using a press to show that the complex composite is not harmed through pressing. We investigate the influence of the pressing impact on the Mössbauer measurements in the context of measurement statistics and the measured signals. We show that pressing is not connected to any changes in the sample regarding the spin and oxidation state. We present that pressing improves the statistics of the Mössbauer measurements significantly. Furthermore, we use SEM measurements and PXRD to investigate whether or not the obtained fiber mats are destroyed in the pressing process

The effect of some technological production variables on mechanical and physical properties of particleboard manufactured from cotton (Gossypium hirsutum) stalks

The current study aims to improve properties of particleboard manufactured from cotton (Gossium hirsutum) stalks glued with urea formaldehyde. To this aim, panel density (at three levels: 0,5; 0,65 and 0,8 g/cm3), press temperature (at two levels: 150 and 180 °C) and press closing speed (at two levels: 4 and 8mm/s) were selected as independent variables. The mechanical properties consist of modulus of rupture, modulus of elasticity and internal bonding and physical behaviors such as water absorption and thickness swelling of panels were determined. Results showed that with increasing the density of panels and press temperature modulus of rupture, modulus of elasticity and internal bonding of panels increased, while bending strengths of panels were differently affected by press closing speedcompared to the internal bonding, so that with increasing the press closing speed modulus of rupture increased, but internal bonding decreased. Moreover, increasing panel density and press temperature, water absorption and thickness swelling of panels decreased. The press closing speed affected the waterabsorption and thickness swelling, insignificantly

Magnetic ZnFe2O4@polyhydroxybenzoic acid nanostructure for efficient B.subtilis capturing

Objective(s): This work focuses on preparing an efficient bacterial capture system based on the magnetic polyphenolic nanostructure. For a reason, a one-step hydrothermally route was employed to prepare ZnFe2O4@hydroxybenzoic acid - resorcinol nanohybrid. Methods: The nanostructure was characterized by X–ray diffraction (XRD), field emission scanning electron microscopy (FE–SEM), transmission electron microscopy (TEM) vibration sample magnetometry (VSM) and zeta potential measurement. Bacillus subtilis was employed as a sample pathogen to evaluate bacterial capture efficiency of the nanohybrid. Results: Characterization results confirmed that the hybrid material is in nano scale. Moreover, it has a magnetic saturation of 6.7 emu g-1 which is in right level to be employed for magnetic separation. Effect of relevant variables on capturing efficiency including pH, contact time and adsorbent dosage was investigated, and optimum levels were obtained. Conclusions: It found that the capturing efficiency is independent of solution pH. Moreover, capturing experiments showed fast equilibrium time of 20 min with the effectiveness more than 99%