Transfer cell morphology is characterized by a polarized ingrowth wall comprising a uniform wall upon which wall ingrowth papillae develop at right angles into the cytoplasm. The hypothesis that positional information directing construction of wall ingrowth papillae is mediated by Ca(2+) signals generated by spatiotemporal alterations in cytosolic Ca(2+) ([Ca(2+)]cyt) of cells trans-differentia...

Ann Saudi Med 28(3) May-June 2008 www.saudiannals.net 217 Fibrovascular polyps are extremely rare benign neoplasms of the hypopharynx that can arise from any site in the pharynx.1,2 Because of the mixture of stromal tissues, it is hypothesized that the fibrovascular polyp may be a hamartoma or an unusual type of inflammatory polyp. Another theory is that they arise secondary to mucosal injury,3...

This study investigated a highly porous titanium foam with and without a PeriApetite coating as an alternative surface for implant fixation. Twelve mongrel canines received staged total hip replacements under International Animal Care and Use Committee (IACUC) approval from our institution. Animals were randomly placed in three- or six-month groups for sacrifice. Seventeen total hips were avail...

The factors determining the layer-specific termination of hippocampal afferents are not known. Previous studies have suggested that the laminated termination of afferent fiber systems is caused by their sequential ingrowth during development. Here we have tested this temporal hypothesis of fiber segregation by an in vitro confrontation system in which the sequential arrival of entorhinal and co...

Figure Legend: Figure 1 Bone Fibro-osseous lesion in the femur of a female B6C3F1/N mouse from a chronic study. Figure 2 Bone Fibro-osseous lesion in a female B6C3F1/N mouse from a chronic study. This fibro-osseous lesion shows replacement of bone by fibrovascular tissue. Figure 3 Bone Fibro-osseous lesion in a female B6C3F1/N mouse from a chronic study. Figure 4 Bone Fibroosseous lesion in a f...

Variable retention (VR) has been adopted globally as an alternative to more intensive forms of regeneration harvest. By retaining live trees within harvest units, VR seeks balance among the commodity, ecological, and aesthetic values managed forests. Achieving these multiple, often competing objectives requires understanding how level spatial pattern shape abundance, growth, mortality regenerat...

Although porous-surfaced orthopedic implants have been designed for fixation by bone ingrowth, there is clinical evidence that this does not always occur. Initial implant movement relative to host bone can result in attachment by a non-mineralized fibrous connective tissue layer. The ranges of movement that result in either bone or fibrous connective tissue fixation are observed in dogs in two ...

Cementless femoral fixation by means of bone ingrowth has been successful in total hip arthroplasty in patients with sufficient bone quality. Consistent bone ingrowth and resultant long-term success involve many factors, including surgical technique, initial mechanical stability achieved at time of implantation, stem design and material, and implant surface. One potential method for achieving f...