In the present work, we analyze the pi-electronic delocalization in a series of annulenes and their dications and dianions by using electron delocalization indices calculated in the framework of the quantum theory of atoms in molecules. The aim of our study is to discuss the Hückel's 4n + 2 rule from the viewpoint of pi-electronic delocalization. Our results show that there is an important incr...

We demonstrate the role of ${D}_{(s)}^{*}$ and their contributions in quasi-two-body decays ${B}_{(s)}\ensuremath{\rightarrow}{D}_{(s)}h{h}^{\ensuremath{'}}$ ($h,{h}^{\ensuremath{'}}={\ensuremath{\pi},K}$) perturbative QCD approach, stemming from quark flavor changing $\overline{b}\ensuremath{\rightarrow}\overline{c}{q}_{2}{\overline{q}}_{1}$ $\overline{b}\ensuremath{\rightarrow}c\overline{{q}_...

BACKGROUND A specific inspiratory muscle 'warm-up' (IWU) prior to assessment of maximal inspiratory mouth pressure (PI(max)) may reduce the number of measurements required to obtain reproducible, representative estimates of PI(max). The influence of inspiratory muscle training (IMT) upon this phenomenon is unknown. OBJECTIVE Compare the impact of an IWU on the between- and within-day reliabil...

To evaluate the role of vitamin D in the physiologic response to phosphorus depletion (P depleton) and the response to vitamin D administration in P depletion, we studied vitamin D-deficient (-D) rats, fed either a normal or low phosphorus diet and then injected intraperitoneally on alternate days with replacement vitamin D(3), 1.25 mug qod (D(3)); 1.25-dihydroxy-vitamin D(3)[1,25(OH)(2)D(3)] i...

Using a recently proposed gauge covariant diagonalization of $\pi a_1$-mixing we show that the low energy theorem $F^{\pi}=e f_\pi^2 F^{3\pi}$ current algebra, relating anomalous form factor $F_{\gamma \to \pi^+\pi^0\pi^-} = and neutral pion $F_{\pi^0 \gamma\gamma}=F^\pi$, is fulfilled in framework Nambu-Jona-Lasinio (NJL) model, solving long standing problem encountered extension including vec...

In this paper some upper and lower bounds for the greatest eigenvalues of the PI and vertex PI matrices of a graph G are obtained. Those graphs for which these bounds are best possible are characterized.

Low phosphate nutrition results in increased chlorophyll fluorescence, reduced photosynthetic rate, accumulation of starch and sucrose in leaves, and low crop yields. This study investigated physiological responses of soybean (Glycine max [L.] Merr.) leaves to low inorganic phosphate (Pi) conditions. Responses of photosynthesis to light and CO(2) were examined for leaves of soybean grown at hig...