Nanocomposite Materials for Cell Growth

We propose a development of carbon nanotube (CNT)/albumin nanocomposite for 2D and 3D tissue organization by cell growth. The adhesion and proliferation for neuroblastoma and fibroblast cells have been investigated on films based on CNT/bovine serum albumin (BSA) nanocomposite. Single-walled car-bon nanotube (SWNT)/BSA composites can be used as a substrate for cell growth of different kind. The layers of nanocomposite properties growing method based on laser radiation action. Investigations of sta-bility, an adhesion and internal structure of layers were performed. Stabilizing properties of the described laser method of manufacture (laser nanoforming) of layers may be associated with the ability to obtain nanotube frame work in composite structure under action of electric field of directed laser radiation. The presence of a such frame creates the conditions for self-assembly of biomedical tissues. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3545

Combined Magnetic Field Sensor with Nanostructured Elements

Abstract A combined magnetic field sensor consisting of a magnetic field concentrator based on a superconducting ring film and a magnetically sensitive element with a spintronics structure is investigated. The active strip (narrowed part) of the concentrator is separated by an insulating film from the magnetically sensitive element, i.e. the combined magnetic field sensor is a sandwich. It has been established that the concentration coefficient of a sandwich-type magnetic field can be increased by fragmentation (nanostructuring) of the active band, in the form of several superconducting branches and cuts 20 nm wide. Increasing the number of incisions also reduces the threshold sensitivity of the sensor by several times. Nanostructured elements in the form of nanoscale sections in the active strip allow you to reduce the diameter of the concentrator ring, which allows the sensor to make the maximum linear size less than 1mm. It is noted that the considered combined magnetic field sensor with nanostructured elements has a high potential for detecting ultraweak magnetic fields (∼ 10 pT), and apparently, can be an alternative to SQUID.</jats:p

Critical Current in the Strip Wires from the Josephson Medium

Abstract On the basis of the previously proposed phenomenological material equation of a superconducting granular medium, numerical simulation of some products from granular superconductors which include, in particular, products from high-temperature superconducting ceramics (and electrodynamic processes in them) is carried out. An expression is obtained for the first critical field of the medium in question and its relation to the phenomenological parameters of the medium. A strip wire model from a granular superconducting medium is constructed, the maximum current of these wires and its dependence on the external magnetic field were obtained. An analogue of the SQUID based on the strip from a granular superconductor is proposed, it is shown that its field characteristic has similarities with the field characteristics of the classical single-contact SQUID.</jats:p

Possible Registration of Magnetic Particles in Biological Objects

Abstract The possibility of non-invasive detection of magnetic particles in biological objects using magnetic field sensors of various types is investigated. Estimates of the threshold sensitivity of the sensors and the maximum distance at which the sensor can detect magnetic particles are made. It is shown that magnetite particles with a concentration of ∼ 10-9 vol.%, superparamagnetic particles and catalytic particles of the composition “iron in carbon nanotubes” can be fixed by SQUID or combined magnetic field sensors with operating temperatures ∼ 4 K at a distance of ≤ 0.1 m. It is noted that magnetic field sensors with ultra-low threshold sensitivity values (≤ 10-10 T) may be promising for non-invasive control of organs, implants, prostheses and other elements of biological systems.</jats:p