Military Academy

About: Military Academy is a based out in . It is known for research contribution in the topics: Population & Fuzzy logic. The organization has 2478 authors who have published 3003 publications receiving 33188 citations.

Reactivation of organophosphate-inhibited acetylcholinesterase by quaternary pyridinium aldoximes.

Abstract: We investigated the relationship between the chemical structure of acetylcholinesterase (AChE; EC 3.1.1.7) reactivators and their potency in reactivating this enzyme, after prior inhibition by VX (O-ethyl-S-(2-diisopropylaminoethyl)-methylthiophosphonate), tabun, sarin, and cyclosarin. The oximes, pralidoxime (2-PAM), HI-6 [1-(2-hydroxyiminomethylpyridinium)-3-(4-carbamoylpyridinium)-2-oxa-propane dichloride], obidoxime and HS-6 [1-(2-hydroxyiminomethylpyridinium)-3-(3-carbamoylpyridinium)-2-oxa-propane dichloride] were used as representatives of the group of AChE reactivators. Rat brain AChE was used as the appropriate source of the enzyme. Our results confirm that there is no single broad-spectrum oxime suitable for the treatment of poisoning with all highly toxic organophosphorus agents.

Sports preference and digit ratio (2d:4d) among female students in wrocław, poland.

Abstract: Humans exhibit sex differences in competitiveness, sensation seeking and risk-taking attitude, which are required in sports. These attributes are often linked to prenatal testosterone (PT) exposure. The second-to-fourth digit length ratio (2D:4D) is an indicator of PT exposure. A lower 2D:4D indicates higher PT exposure and vice versa. Males generally have a lower 2D:4D than females. Sensation- and/or thrill-seeking behaviours have also been found to be negatively associated with 2D:4D. Boxing and judo are considered to be high-risk sports. Voluntary participation in judo/boxing in contrast to aerobics can be guided by such behaviours and thus have an association with lower 2D:4D. This cross-sectional study included 167 female students from a military academy in Wroclaw, Poland. Of them, 119 had voluntarily chosen aerobic exercise, and 48 opted for judo/boxing. Height, weight and second and fourth digit lengths were measured. Physical fitness was assessed using Eurofit tests. The two groups showed similar physical fitness and body size. However, the judo/boxing group had significantly lower mean 2D:4D values than the aerobics group. It is proposed that voluntary choice of participation in a sport discipline by women could be linked to the 'organizational' effect of intrauterine testosterone exposure during prenatal growth.

Fano resonances of a curved waveguide with an embedded quantum dot

Abstract: A theoretical study of a waveguide with a uniformly curved section and an embedded quantum dot is presented within the envelope function approximation. For the quantum dot being extremely localized in the direction of the electron propagation, exact form of the scattering matrix of the system is derived, and a conductance of the waveguide is calculated. It is shown that if, for the straight wire with dot, in the fundamental mode conductance is a monotonically increasing function of the Fermi energy, then, after bending the waveguide, one has Fano resonances on the conductance-Fermi energy dependence. The resonances appear as a result of mixing by the bend of the longitudinal and transverse electron motion in the straight parts of the waveguide and concomitant intersubband interaction. For the small bend angle (large bend radius) the width of the resonance grows narrower with decreasing the angle (increasing the radius), until in the limit of the zero angle (infinite radius) one recovers true bound state in the continuum and the corresponding monotonic conductance of the straight channel. A dependence of the resonance width on the parameters of the bend and the dot is investigated; in particular, it is shown that, as a result of coherent resonant phenomena in the superposition of the bend and the dot, true bound states in the continuum can be formed also for the nonzero bend angle and the finite bend radius. Miscellaneous cases of bending the waveguide which, if uncurved, already exhibits the Fano resonance, are also investigated; for example, it is shown that in this situation, as a result of the bend, resonances can collapse too, again producing true bound states in the continuum. The case of inversion of the Fano resonances, i.e., a change of their minimum and maximum mutual location, is also analyzed. Mathematical and physical interpretation of the obtained results is given, and characteristic features of the critical parameters at which the Fano resonances collapse, are discussed. It is demonstrated that currents flowing in the waveguide, near the Fano resonances drastically change their behavior from laminar to vortical structure, and an evolution of the vortices is described. Parallels are drawn to the other types of the guiding structures, such as electromagnetic waveguides and acoustic ducts.