background: abnormal levels of the markers afp, hcg, and ue3 could be useful in predicting adverse pregnancy outcomes. this study was designed to determine the correlation between second trimester maternal serum markers and adverse pregnancy outcome (apo). methods: in this historical cohort study, we randomly followed 231 obstetric patients with quadruple screening test in 14-18 weeks of gestat...

In this paper, we give some new examples of polynomial D(n)triples and quadruples, i.e. sets of polynomials with integer coefficients, such that the product of any two of them plus a polynomial n ∈ Z[X] is a square of a polynomial with integer coefficients. The examples illustrate various theoretical properties and constructions for a quadratic polynomial n which appeared in recent papers. One ...

In this paper, we first show that for any fixed D(−1)-triple {1, b, c} with b < c, there exist at most two d’s such that {1, b, c, d} is a D(−1)-quadruple with c < d. Using this result, we further show that there exist at most 10 D(−1)-quadruples. AMS subject classifications: 11D09, 11D45