Testing the comprehension of spoken language is of primary importance. A lot of factors may affect the performance of EFL learners on listening comprehension tests, among which are the use of visual advance organizers, and types of listening passages (dialogues or monologues). As B-Ikeguchi (1997) states a few studies have been carried out on the effects of these factors on EFL learners’ listen...

Cell fate in the cephalic neural primordium is controlled by an organizer located at the midbrain-hindbrain boundary. Studies in chick, mouse and zebrafish converge to show that mutually repressive interactions between homeodomain transcription factors of the Otx and Gbx class position this organizer in the neural primordium. Once positioned, independent signaling pathways converge in their act...

Formation of the organizer is one of the most central patterning events in vertebrate development. Organizer-derived signals are responsible for establishing the CNS and patterning the dorsal ventral axis. The mechanisms promoting organizer formation are known to involve cooperation between Nodal and Wnt signalling. However, the organizer forms in a very restricted region, suggesting the presen...

background: methicillin-resistant (mrsa) staphylococcus aureus ( s. aureus ) are responsible for a vast number of nosocomial infections especially in immunocompromised subjects such as cancer patients. the presence of comorbidities including malignancies has been associated, with s. aureus bacteremia mortality. thus, the detection of mrsa in this patients and the antibiotic susceptibility patte...

The reaction-diffusion system modeling the dorsal-ventral patterning during the zebrafish embryo development, developed in [Y.-T. Zhang, A.D. Lander, Q. Nie, Journal of Theoretical Biology, 248 (2007), 579–589] has multiple steady state solutions. In this paper, we describe the computation of seven steady state solutions found by discretizing the boundary value problem using a finite difference...

The developing vertebrate nervous system arises from ectoderm in response to inductive signals from the dorsal mesoderm, or Spemann organizer. It displays pronounced anteroposterior (AP) pattern, but the mechanism that generates this pattern is poorly understood. We demonstrate that the inducing ability of dorsal mesoderm is regionalized along the AP axis at the early gastrula stage, using the ...

The formation of Spemann organizer is one of the most important steps in dorsoventral axis determination in vertebrate development. However, whether the organizer forms autonomously or is induced non-cell-autonomously is controversial. In this report we have isolated a novel zebrafish homeobox gene, dharma, capable of inducing the organizer ectopically. The expression of dharma was first detect...