Authors:S. Mondal, M. Berihun, M. Kovacs, G. Vatai and A. Koris
Microscopic organisms play a vital role in the field of green technology. Among the genera fungi, the group of entomopathogens includes Beauveria bassiana, which has been found to have multifunctional applications. In this present research, we have attempted to partially purify chitinase from two strains of Beauveria bassiana (F881 and F911), each cultured in minimal media with 1% (w/v) colloidal chitin as well as in Sabouraud's dextrose media with 1% (w/v) colloidal chitin. The purification process was done with a setup of ceramic membranes, which comprises two stages, ultrafiltration (50 nm pore size membrane) and nanofiltration (MWCO 5 kDa). Furthermore, with the analysis of yield of enzymatically hydrolyzed NAG (N-acetyl glucosamine), resistance and fouling of the membrane were also studied.
Authors:Martial Duchamp, Vadim Migunov, Amir H. Tavabi, Adnan Mehonic, Mark Buckwell, Manveer Munde, Anthony J. Kenyon and Rafal E. Dunin-Borkowski
Silicon oxide-based resistive switching devices show great potential for applications in nonvolatile random access memories. We expose a device to voltages above hard breakdown and show that hard oxide breakdown results in mixing of the SiOx layer and the TiN lower contact layers. We switch a similar device at sub-breakdown fields in situ in the transmission electron microscope (TEM) using a movable probe and study the diffusion mechanism that leads to resistance switching. By recording bright-field (BF) TEM movies while switching the device, we observe the creation of a filament that is correlated with a change in conductivity of the SiOx layer. We also examine a device prepared on a microfabricated chip and show that variations in electrostatic potential in the SiOx layer can be recorded using off-axis electron holography as the sample is switched in situ in the TEM. Taken together, the visualization of compositional changes in ex situ stressed samples and the simultaneous observation of BF TEM contrast variations, a conductivity increase, and a potential drop across the dielectric layer in in situ switched devices allow us to conclude that nucleation of the electroforming—switching process starts at the interface between the SiOx layer and the lower contact.
Authors:Nikolett Oláh, Mónika Furkó, Zoltán May, Attila Sulyok and Katalin Balázsi
corrosion resistance. Numerous methods are available for the development of suitable implant materials. Each has known advantages and disadvantages. One solution can be producing more biocompatible – Al- and V-free – β-type Ti alloys containing non
Authors:Haroune Rachid Ben Zine, Filiz Cinar Sahin, Zsolt E. Horváth, Zsolt Czigány, Ákos Horváth, Katalin Balázsi and Csaba Balázsi
316L Austenitic stainless steel has attracted attention due to its good mechanical properties at high temperatures, good corrosion resistance, and good weldability, which can be an effective solution for
as interlayer (Figures 1 and 2 ). The thickness of the Cu foil is 70 μm. The experiment was carried out in a resistance tube furnace under inert gas (Ar) environment at a temperature of 1100 °C. The holding times were 5 and 10 min, respectively
mainly the aluminum alloys are the optimum choice for part manufacture [ 1 ], where they offer significant advantages of lightweight, attractive appearance, excellent processability and high corrosion resistance besides it complete recyclability. The
velocity) which could make the solution viscosity decrease from 2.77 Pa·s (zero-shear viscosity) to 2.16 Pa·s and 2.44 Pa·s, respectively (Table 2 ). Lower viscosity can render the polymer easier to be stretched into a fiber due to the less resistance of
Authors:Wisdom Okechukwu Egbujuo, Placid Ikechukwu Anyanwu and Henry Chinedu Obasi
-reinforcing fillers. The reinforcing fillers are those which when introduced into rubber matrix will improve the tensile strength, tear strength, abrasion resistance and other mechanical properties of the rubber vulcanizate, whereas non-reinforcing fillers are added