Breakdown of boundary layer streaks is studied experimentally and compared at zero and adverse (positive) streamwise pressure gradients on a wing under fully controlled experimental conditions. The varicose mode of streak breakdown is found to be a dominant mode in the case of the adverse pressure gradient. A strong influence of pressure gradient upon the development of the streak and the secon...

Most of commercial computed tomography (CT) system employs filtered back projection (FBP) based algorithm to reconstruct tomographic image. Although FBP originated from an analytical solution, it generates streak artifacts during practical implementation due to interpolation between projection lines. The presence of streak artifacts will result in misinterpretation of tomographic features espec...

A prospective fate map of the late gastrulation mouse primitive streak has been charted in 8.5 dpc mouse embryos developed in culture, using the lineage marker DiI to label groups of cells. As at earlier stages, the fate of cells in the 8.5 dpc primitive streak is regionalised such that successively more caudal regions of the streak give rise to more lateral mesoderm. While most labelled cells ...

The primitive streak in peri-implantation embryos forms the mesoderm and endoderm and controls cell differentiation. The metabolic cues regulating primitive streak formation remain largely unknown. Here we utilised a mouse embryonic stem (ES) cell differentiation system and a library of well-characterised drugs to identify these metabolic factors. We found that statins, which inhibit the mevalo...

Oxidized lipoproteins may play a role in atherosclerosis. Recently, we have demonstrated that the levels of oxidized fatty acids in the circulation correlate directly with the quantity of oxidized fatty acids in the diet and that dietary oxidized fatty acids accelerate atherosclerosis in rabbits. The present study tests the hypothesis that oxidized cholesterol in the diet accelerates the develo...

The Diagnostic Development Group at the Laboratory for Laser Energetics has endeavored to build a stand-alone, remotely operated streak camera with comprehensive autofocus and self-calibration capability. Designated as the Rochester Optical Streak System (ROSS), it is a generic streak camera platform, capable of accepting a variety of streak tubes. The system performance is limited by the insta...

Gastrulation in amniotes begins with extensive re-arrangements of cells in the epiblast resulting in the formation of the primitive streak. We have developed a transfection method that enables us to transfect randomly distributed epiblast cells in the Stage XI-XIII chick blastoderms with GFP fusion proteins. This allows us to use time-lapse microscopy for detailed analysis of the movements and ...

The origin of the prelung cells was determined by tracing the movements of [H]thymidinelabelled grafts excised from medium-streak to 4-somite stage chick embryos and transplanted to the epiblast, streak, and endoderm-mesoderm of similarly staged recipient embryos. At the medium-streak stage the prelung endoderm cells are in the anterior third of the primitive streak; they shortly begin to migra...

The chicken homebox containing gene, CdxA (formerly CHox-cad), was previously shown to be expressed during gastrulation. Localization of CdxA transcripts by in situ hybridization to tissue sections revealed that, during gastrulation, expression of this gene exhibits a posterior localization along the primitive streak. The transcripts are localized to epiblast cells in the vicinity of the primit...

a seventeen-years old woman was presented with infertility and primary amenorrhea. she had normal stature, femate phenotype and normal development of breasts, external genitalia, vagina and cervix. pelvic examination showed a large lobulated mass. on sonography there was a mass with probable origin of ovary. paraclinic tests were carried out. gonadotropins were in postmeno pausal limits. alpha ...