Saturable discrete vector solitons in one-dimensional photonic lattices

Localized vectorial modes, with equal frequencies and mutually orthogonal polarizations, are investigated both analytically and experimentally in a one-dimensional photonic lattice with saturable nonlinearity. It is shown that these modes may span over many lattice elements and that energy transfer among the two components is both phase and intensity dependent. The transverse electrically polarized mode exhibits a single-hump structure and spreads in cascades in saturation, while the transverse magnetically polarized mode exhibits splitting into a two-hump structure. Experimentally such discrete vector solitons are observed in lithium niobate lattices for both coherent and mutually incoherent excitations.Comment: 4 pages, 5 figures (reduced for arXiv

The importance of buffalo in milk production and buffalo population in Serbia

This research paper gives an analysis on the size of world's domestic buffalo populations, their milk production and the size of buffalo population in Serbia. Population of domestic buffalo in the world is constantly increasing so that in 2013 there were 199 783 549 individuals, out of which in India in the same year they raised 57.77% of buffalo world population, in Pakistan 18.87%, and in China 11.64%. The share of total world production of buffalo milk in total world milk production in 2012 was 12.92 % or 97 417 135 t out of which 67.76% was produced in India. In Serbia buffalo is raised in the regions of Raška (about 1000 individuals) and Kosovo. Populations of buffalo in central Serbia show a tendency of decreasing in size what was the reason to start a programme of in situ conservation 10 years ago. On the sample of buffalo population encompassed by the programme of conservation the body measures were analysed indicating that the population of buffalo is quite unequalised and that average values obtained for exterior measures are similar to the results obtained by the authors of earlier period for the population of buffalo in the area of former Yugoslavia

Management of roe deer population (Capreolus capreolus L.) in Serbia

ABSTRACT The research was conducted during the 2018/19 hunting year at three hunting grounds: "Barajevska reka" - "Takovo" and "Jadar". The average density of Roe deer in hunting grounds varied from 48.67 to 74 individuals per 1,000 ha of hunting-productive area. However, when observing the number of individuals per 1,000 ha of total hunting area, the density varies from 16.07 individuals to 34.72 individuals. The determined gender ratio at the hunting ground "Jadar" was (M: F = 1: 0.93). At the hunting ground "Takovo", the gender ratio was (M: F = 1: 1.22), while at the hunting ground "Barajevska reka" the ratio was (M: F = 1: 1.59). The average fertility of Roe deer was 1.67 embryos per individual, or 1.75 embryos per pregnant female. Depending on the study area, the real growth varied from 0.54 to 0.73 fawns per female. Loss in Roe deer are caused mostly by biotic factors. The determined average age of shot individuals varied depending on the hunting ground from 3.53 to 5.24 years. The current state of Roe deer populations in Serbia varies between analyzed hunting grounds, but the overall situation is quite unsatisfactory, especially in terms of density, gender ratio and age structure of culled individuals

Doubly periodic waves of a discrete nonlinear Schr\"odinger system with saturable nonlinearity

A system of two discrete nonlinear Schr\"odinger equations of the Ablowitz-Ladik type with a saturable nonlinearity is shown to admit a doubly periodic wave, whose long wave limit is also derived. As a by-product, several new solutions of the elliptic type are provided for NLS-type discrete and continuous systems.Comment: 12 pages, to appear, Journal of nonlinear mathematical physic

Promene steroidnih receptora u toku histopatoloske transformacije tkiva humanog uterusa

Estrogen (ER) and progesterone receptors (PR) were analyzed in the cytosol and nuclei prepared from specimens of human uterine tissue of patients with certain disorders identified as hyperplasia endometrii adenomatosa, myoma uteri per magnum, adenocarcinoma endometrii and adenocarcinoma corporis uteri. These investigations have revealed a different level of ER and PR in analyzed tissue specimens, as well as the existence of a relationship between changes in receptor levels and respective Kd. These changes suggest a correlation between steroid receptor levels and the type of tissue transformation. The functionality of the receptors was analyzed by the ultracentrifugation of non-activated and activated steroid-receptor complexes in sucrose density gradients, as well as by the investigation of their interaction with isolated nuclei. These results indicate that some changes in steroid receptor molecules can be detected when the tissue turns from normal to malignant transformation. On the basis of this investigation it could be proposed that the analysis of activated and non-activated steroid-receptor complexes by means of the methods used in this study can be applied as a useful clinical tool in the determination of the endocrine dependence of transformed tissues, as well as for the optimum dosing of individual treatment of patients with uterine and other tissue carcinoma

Compact localized modes in the flux dressed 2D octagonal-diamond photonic lattice in the presence of nonlinearity

The flat-band lattice systems attract researches in photonics owing to peculiar transport properties and localization of light in the absence of dispersion [1, 2]. Moreover, the photonic flat-band systems are easy manageable platforms for testing the properties of the nearly flat band systems in the context of the condensed mater physics. Here, we extend our previous study [3] of the compact localized modes in the two-dimensional photonic octagonal-diamond lattice (ODL) dressing it with artificial flux. We provide a routine to change the band structure of the ODL, with two flat-bands interrelated by one dispersive band (flux-free case), to those with one fully gapped flat-band by tuning the value of the artificial flux [4]. The possibility of realization of the proposed system in the laboratory is offered by experiments with optical resonators and the femto-second laser inscribed curved lattices. The flat-band compact localized linear eigenmodes will be examined numerically. The main aim is to test their robustness to the presence of the local nonlinearity. We investigate dependence of the dynamical properties of the nonlinear localized modes continued by nonlinearity from the linear compacton families on the flux-determined flat-band patternVIII International School and Conference on Photonics and HEMMAGINERO workshop : PHOTONICA2021 : book of abstracts; August 23-27, 2021; Belgrad

The influence of 17-oxo- and 17-hydroxy-16,17-secoestratriene derivatives on estrogen receptor

Since many of newly synthesised D-secoestratriene derivatives showed antiestrogenic effect, with almost a total loss of estrogenic activity, we studied the effects of some of these compounds on estrogen receptors (ER), the translocation of the estrogen-ER complexes formed in presence of competing substances into the nucleus, as well as the binding of these complexes to DNA. The results of uterotrophic effects of analysed derivatives are in agreement with the influence of these compounds on activity and binding parameters of estrogen receptors. Namely, compounds that show relatively high antiestrogenic activity predominantly increase K-d and inhibit translocation to nuclei of radioactive complexes formed in their presence. On the other hand, compounds that do not significantly change binding parameters of estrogen receptors do not show antiestrogenic effect in in vivo experiments