Atomic force microscopy bending tests of a suspended rod-shaped object: Accounting for object fixing conditions.

The technique of atomic force microscopy (AFM) bending tests of a suspended nano-object (scroll, tube, rod) makes it possible to calculate the Young's modulus of the material it is made of based on experimental data. However, the calculation results involve a large error due to uncertain conditions (console or bridge) of fixing the test object. One of the ways to reduce this error is based on the theoretical consideration of consoles or bridges as beams with one or two ends resting on Winkler elastic foundations.

Thermal Treatment Impact on the Mechanical Properties of MgSiO(OH) Nanoscrolls.

A group of phyllosilicate nanoscrolls conjoins several hydrosilicate layered compounds with a size mismatch between octahedral and tetrahedral sheets. Among them, synthetic MgSiO(OH) chrysotile nanoscrolls (obtained via the hydrothermal method) possess high thermal stability and mechanical properties, making them prospective composite materials fillers. However, accurate determination of these nano-objects with Young's modulus remains challenging.

Insights into Solid-To-Solid Transformation of MOF Amorphous Phases.

Metal-organic frameworks (MOFs) have been recently explored as crystalline solids for conversion into amorphous phases demonstrating non-specific mechanical, catalytic, and optical properties. The real-time control of such structural transformations and their outcomes still remain a challenge. Here, we use high-resolution transmission electron microscopy with 0.

Cation Redistribution along the Spiral of Ni-Doped Phyllosilicate Nanoscrolls: Energy Modelling and STEM/EDS Study.

Here, we study the stress-induced self-organization of Mg and Ni cations in the crystal structure of multiwalled (Mg ,Ni ) Si O (OH) phyllosilicate nanoscrolls. The phyllosilicate layer strives to compensate size and surface energy difference between the metal oxide and silica sheets by curling. But as soon as the layer grows, the scrolling mechanism becomes a spent force.

[Cloning of genes, purification and properties investigation of recombinant DNA ligases from the thermophilic archaeon Pyrococcus abyssi and Methanobacterium thermoautotrophicum].

The genes encoding of DNA ligases from the thermophilic archaeon Pyrococcus abyssi (PabDNA ligase) and Methanobacterium thermoautotrophicum (MthDNA ligase) were cloned and expressed in Escherichia coli. The activity of purified enzymes was studied by ligation of two oligonucleotides, one of which had preformed hairpin structure. In the used system the maximal output of reaction products for both DNA ligases was observed near 70 degrees C that is explained by substrate thermostability.