background and objective: pregnancy termination and recurrent abortion are one of the common complications during pregnancy and in patients with a bad obstetric history. materials and methods: in this study, a total of 154 individuals including 75 couples four single women from different communities and with various incomes were investigated chromosomal abnormalities using blood culture and chr...

In Drosophila, the sex of XX germ cells is determined by somatic signals. Whether sex-specific genes, however, are activated or repressed by somatic signals is not known. We have used mgm1, a germline-marker which is specifically expressed in male germ cells to analyze sex-specific gene expression of embryonic germ cells. We found that XX and XY germ cells that do not contact gonadal tissue can...

Accepted xx-xx-xxxx; Received xx-xx-xxxx ABSTRACT The proximity eeect of metal line absorption systems in spectra of high redshift quasars and quasar pairs is investigated through the distribution of Ly forests. No strong proximity eeect is found down to 500 km/sec away from a metal line absorption system for lyman clouds with 13:3 log N HI < 13:8 at a redshift of 3. Its implication on properti...

This paper addresses the problem of generating strong convex relaxations of Mixed Integer Quadratically Constrained Programming (MIQCP) problems. MIQCP problems are very difficult because they combine two kinds of non-convexities: integer variables and nonconvex quadratic constraints. To produce strong relaxations of MIQCP problems, we use techniques from disjunctive programming and the liftand...

In this paper we studied the thermal negativity in a two-qubit XX spin ½ chain model and XXX spin1/2 chain model(isotropic Heisenberg model)spin-1/2 chain subjected to an external magnetic field inz direction. We calculate analytical relation for the thermal negativity for two qubit XX and XXX spinchain models in the external magnetic field. Effects of the magnetic field and temperature on then...

The main factor influencing sex determination of an embryo is the sex-determining region Y (SRY), a master regulatory gene located on the Y chromosome. The presence of SRY causes the bipotential gonad to differentiate into a testis. However, some individuals carry a Y chromosome but are phenotypically female (46,XY females) or have a female karyotype but are phenotypically male (46,XX males). 4...

Cytogenetic studies from case 1 included cultures of peripheral blood and skin fibroblasts. Karyotypes from both cultures showed trisomy D(47,XX, + D). Giemsa banding of cells from the skin fibroblast culture, using a modification of the method of Seabright (1971), showed 47,XX,+ 13 (Fig. 3). Chromosome analysis of peripheral leucocytes of the parents were normal. In case 2 the karyotype from a...

We critically examine the possibility of determining the parity of the Θ + (1540) from the reactions N N → Θ + Y (Y = Λ, Σ) recently discussed in the literature. Specifically, we study the energy dependence of those observables that were suggested to be the most promising ones to unravel the parity of the Θ + , namely the spin correlation coefficient A xx , and the spin transfer coefficient D x...

background: division of human genetics (dhg) is a referral center for karyotyping and counseling to the couples as well as to the individuals referred with bad obstetric history and infertility. materials and methods: from 1972 to 2003, overall 1666 couples and 131 female partners with bad obstetric history (boh) such as; spontaneous abortions, live births with congenital malformations and stil...

Background When gonadal sex reversal occurs in mammalian species, the resultant XX males and XY females become infertile or subfertile, suggesting critical roles of sex chromosomes in germ cell differentiation. The objective of our study is to clarify the mechanism of infertility in the B6.YTIR (XY) sex-reversed female mouse, which can be attributed to a failure in the second meiotic division i...