[This corrects the article DOI: 10.7759/cureus.2046.].

Abstract Background Biological prostheses are increasingly been used in young patients to avoid anticoagulation. The Edwards Inspiris aortic bioprosthesis is extremely promising this population, since it has shown reduced calcification of the prosthetic leaflets preclinical and early clinical studies. Little data available, however, younger than 65. This study investigates hemodynamic performan...

Neurogenesis is known to take place in the adult brain. This work identifies T lymphocytes and microglia as being important to the maintenance of hippocampal neurogenesis and spatial learning abilities in adulthood. Hippocampal neurogenesis induced by an enriched environment was associated with the recruitment of T cells and the activation of microglia. In immune-deficient mice, hippocampal neu...

Given a polygonal subdivision of the plane and some query point, we would like to know which region (or edge or vertex) contains it. In one dimension, the problem reduces to locating a query point in a subdivision of the line into intervals, and is easily solved by binary search. We will look for a method to extend the idea of binary search into two dimensions. Given a subdivision with m edges,...

Interactions between the soma and germline are essential for gametogenesis. In the Drosophila testis, differentiating germ cells are encapsulated by two somatic cells that surround the germline throughout spermatogenesis. chickadee (chic), the fly ortholog of Profilin, mediates soma-germline interactions. Knockdown of Chic in the soma results in sterility and severely disrupted spermatogenesis ...

DILEMMAS OF POPULATION, ENVIRONMENT AND SUSTAINABLE DEVELOPMENT In the 1980s and 1990s, there was widespread belief among environmentalists and lay people that uncontrolled population growth was responsible for environmental degradation of all types. This neo-Malthusian belief originally surfaced in the publication of The Population Bomb by Ehrlich and Ehrlich in the late 1960s, which interpret...

BACKGROUND Higher body mass index (BMI) and circulating estrogen levels each increase postmenopausal breast cancer risk, particularly estrogen receptor-positive (ER(+)) tumors. Higher BMI also increases estrogen production. METHODS We estimated the proportion of the BMI-ER(+) breast cancer association mediated through estrogen in a case-control study nested within the Prostate, Lung, Colorect...

Let x = (x1, . . . , xp) ′ ∼ N(0,Σ), where Σ is a p×p positive definite matrix. Assume that we have observed a sample of size n, (yi,xi) n i=1 and assume σ = 1. Consider simulating data by taking various combinations of (n, p,Σ,β) as follows: (a) n = 50, 500 (b) p = 100, 1000 (c) Σ = I,S0.1,S0.6 (d) casse (i) β1 = · · · = β5 = 3, βj = 0 for any other j; case (ii) β1 = · · · = β5 = 5, β6 = · · ·...

OBJECTIVE To assess the obesity prevalence in Saudi adults according to the international standards of body mass index (BMI) and body fat percentage (BF%). METHODS Five hundred and thirty healthy Saudi adults aged 18-72 years (mean 36.91 ± 15.22 years) were enrolled in this study. Their body composition was assessed by bioelectrical impendence analysis with a commercially available body compo...