Vitreous space

Gunnarson G, Jakobsson AK, Hamberger A, SjOstrand J (1987) Free amino adds in the pre-retinal vitreous space. Effect of high potassium and nipecotic add. Exp Eye Res 44 235-244. 

Insulation having high thermal endurance has been made from vitreous siUca fibers (see Ablative materials). Such material forms the basis for the 30,000 iasulatiag tiles, 125-mm thick, that protect the aluminum skin of the space shuffle. The tiles add a minimum of weight because the density of the iasulation is only 144 kg/m (9 lb/fT), similar to balsa wood. 

Space-based solar ceUs are covered with a very thin layer of vitreous siHca to protect against the damaging environment of space such as atomic oxygen, micrometeorites, and radiation effects. Because the siHca is transparent to damaging uv radiation, it is normally coated with a uv-reflective thin film... 

The vitreous is a transparent extracellular matrix occupying the space between the posterior lens and the retina and, in the majority of vertebrate species, constitutes the major f)art of the volume of the eye. Embryo-logically it can be considered as the basement membrane of the retina. It provides a mechanical support for surrounding tissues and acts as a shock absorber by virtue of its viscoelastic properties (Balzas and Delinger, 1984). Vitreous consists mainly of water (98%) and colloids (0.1%) with ions and low molecular weight solutes making up the remainder. It is not fully developed at birth, and changes in both volume and chemical composition occur postnatally. 

Blood, vitreous humor, urine Ethanol ADH enzymatic Spectrophotometric Head-space GC... 

Figure 6AO Temperature dependence of enthalpy (A) and heat capacity (B) for CaMg-Si206 component in crystalline, vitreous, and molten states at various T conditions. Reprinted with permission from Richet and Bottinga (1986), Review of Geophysics and Space Physics, 24, 1-25, copyright 1986 by the American Geophysical Union.

Internal tamponade potency is the capacity to obdurate a dehiscence. It is correlated to the surface pressure of the product used. Schematically, the higher the tension, the stronger the tendency of the fluid to form a single bubble and to remain in the vitreous cavity without running through retinal dehiscences into the subretinal space. As a result, no fluid is passing through retinal dehiscences, which makes retinal reapplication possible. The internal tamponade potency is unrelated to the viscosity of the product. 

Examine the head, upper and lower jaws and lips, snout, naris, diagrams and relevant descriptions correspond. Nasolabial sul-cus/cleft, nasal cavity and septum, oral cavity, palate, palatine ridges, incisors, cranium, pinna, eyelid, eye/lens, retina, cornea, vitreous and aqueous chambers, nasopharynx, olfactory lobe, cerebral hemispheres, lateral ventricles, cranial nerves, third ventricle, pituitary, pineal gland, thalamus, perimeningeal space, and internal ear. 

Space shuttle vehicles -vitreous silica windows [SILICA - VITREOUS SILICA] (Vol 21)... 

The ILM (Figure 24.1 and Figure 24.3) borders the neuroretina from the vitreous (internal) side. Its outer portion consists mostly of the basement membrane of Muller s cells, whereas the inner portion is formed by vitreous fibrils and mucopolysaccharides. This basement membrane covers the entire inner surface of the retina. Anteriorly it is around 50 nm in thickness, and posteriorly it thickens to around 2000 nm. ILM acts as a selective permeation barrier between the intercellular space of the retina and the vitreous [21]. 

At the inner border of ONH, the ILM becomes continuous with the basement membrane of fibrous astrocytes lining the internal surface of the ONH [21]. However, the lateral borders between the ONH and the adjacent choroid and retina are not well defined. Furthermore, it was reported [49] that micro vessels in the prelaminar region of the ONH lack classical blood-brain barrier characteristics and display nonspecific permeability, possibly mediated by vesicular transport. Thus, there is a theoretical possibility that topically applied drugs can penetrate indirectly through the retrobulbar space and then, through the ONH, reach the posterior choroid and retina. It was reported that following retrobulbar administration of fluorescein, the dye rapidly accumulated in the ONH and penetrated later to the vitreous [50],... 

---