نتایج جستجو برای: labyrinth disease
تعداد نتایج: 1496379 فیلتر نتایج به سال:
OBJECTIVES/HYPOTHESIS To describe the histopathologic findings in the temporal bone in patients with neurofibromatosis type 2 (NF2). The literature contains limited data on otopathology of NF2. STUDY DESIGN Basic science study. METHODS Twenty-six temporal bones from 16 patients with NF2 were examined by light microscopy. The diagnosis of NF2 was made on the basis of bilateral cochleovestibu...
Ancient DNA (aDNA) research involves invasive and destructive sampling procedures that are often incompatible with anthropological, anatomical, and bioarcheological analyses requiring intact skeletal remains. The osseous labyrinth inside the petrous bone has been shown to yield higher amounts of endogenous DNA than any other skeletal element; however, accessing this labyrinth in cases of a comp...
The development of the paranasal sinuses is an intricate process that begins in the intrauterine life and terminates in early adulthood. Among the paranasal sinuses, the ethmoid cells or labyrinth are probably the most complex structures, being associated with the highest number of normal variants. Variations in the pattern of pneumatization of the ethmoid cells can be divided into intraand ext...
In this paper, an experimental study is presented on navigation in a 3D virtual environment by blind and visually impaired people with haptic and audio interaction. A simple 3D labyrinth is developed with haptic and audio interfaces to allow blind and visually impaired persons to access a three-dimensional Virtual Reality scene through senses of touch and hearing. The user must move from inside...
OBJECTIVE To determine whether unilateral activation of the vestibular labyrinth by brief air conducted tones can elicit disconjugate reflex eye movements in healthy subjects. METHODS 40 normal volunteers, one patient with bilateral congenital sensorineural deafness, and four patients with an acoustic neuromas were subjected to monoaural air conducted tones (125 to 6000 Hz; 132 dB SPL; 3-4 ms...
This work presents anapplication of the agent echnology to the simtdation i the robotic domain. A group of robots cooperate with each other to simulate a large surface which as a labyrinth structure. A robot is represented as a specialist agent which as for task to recognize di~erent paths characterizing thisurface. The application s supported bya hybrid and hierarchical architecture model call...
Monoallelic expression of imprinted genes, including ones solely expressed in the placenta, is essential for normal placental development and fetal growth. To better understand the role of placental imprinting in placental development and fetal growth, we examined conceptuses developing in the absence of maternally derived DNA (cytosine-5-)-methyltransferase 1o (DNMT1o). Absence of DNMT1o resul...
Transfer cells (TCs) support high rates of membrane transport of nutrients conferred by a plasma membrane area amplified by lining a wall labyrinth comprised of an uniform wall layer (UWL) upon which intricate wall ingrowth (WI) papillae are deposited. A signal cascade of auxin, ethylene, extracellular hydrogen peroxide (H2O2) and cytosolic Ca2+ regulates wall labyrinth assembly. To identify ge...
In a previous paper, 1 I have shown that the ampullae alone, without the otoliths, suffice for all the dynamic functions of equilibrium of the ear, and that the otoliths alone, without the ampullae, also suffice for all the dynamic functions except that of response to rotation in a horizontal plane. I wish now to point out what I believe to be the mechanisms by which these reactions are brought...
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