Lumen opening

Airway lumen Opening in conducting airway through which air moves... 

LEsophageal lumen (opening) -Normal squamous lining ... 

Nanoassembly on Tubules and at the Lumen Opening 429 % Releases of proteins from Halloysite assisted with PEI... 

Ultrafiltration hollow-fiber modules are usually made with a shell and tube configuration. The fibers are potted at both ends of the module with the fiber lumen open for recirculation of the process stream (Figure 21). Naturally, strainers or prefilters must be utilized to eliminate plugging of the fibers. At Nude-pore, it has been shown that larger diameter hollow fibers, 1.5 to 3mm in i.d., are much less prone to fouling. Fortunately, all UF hollow fiber systems can be back-washed and are amenable to a number of cleaning techniques. 

The lamellar pattern is believed to be due to the differential rates of fibrillar formation during daily growth cycles [277,278]. Differential compaction of the fibrils provides variations in fibrillar bonding, and determines accessibility or permeability into the inner areas of the fiber. The lumen is the central opening in the fiber that spans its length from base nearly to the tip. It contains the dried residues of cell protoplasm, the only source of noncellulose materials in the fiber other than those in the primary wall. A thin cell wall (lumen wall) provides the inner cell boundary. The lumen opening occupies about 5% of the cross-sectional area of the mature fiber. 

Gating has been proposed to occur via a rotational movement that begins in a portion of the cytoplasmatic C-linker region (red helices in Figure 11). This rotational movement is then transmitted upward, allowing for the rotation of the upper part of helices of the channel (called S6 in Figure 11). These are in contact with the pore lumen, at the outer mouth of the channel. As a result, the pore lumen opens and sodium and calcium ions enter the channel. 

LTO has been shown to be relatively free of damage to the normal vessels and to the RPE (16,17). CNV lesions were created in a rat model, some of which were treated with LTO and some left untreated. Light and electron microscopy showed that three of four untreated CNVs had more than one lumen open and no occlusion, and that one CNY had spontaneously occluded vessels (18). Microscopic examination of eight LTO-treated CNVs showed six with no CNV, one with partial occlusion and one without occlusion. LTO-treated areas next to the CNVs showed normal photoreceptors, RPE, Bruch s membrane, and choriocapillaris (Fig. 3) (15). The preservation of the RPE may be particularly important in AMD, because it is already abnormal and may be more sensitive to additional injury. The intact nature of Bruch s membrane is also important in AMD because breaks are believed to be associated with further proliferation of the CNV into the subretinal space. 

Fig. 1. Effect of osmotic gradients on water absorption by a normal gallbladder. Abcissa, osmolarity of luminal solution minus osmolarity of outer solution. Ordinate, rate of change of weight of gallbladder preparation (weight loss means that fluid is being absorbed from the lumen). Open circles denote experiments in which the luminal solution is different from the reference and the bath solution is at reference closed circles, experiments in which the bath is different from reference and the lumen at reference the half-filled circle, both solutions at reference. (From [4].)...

To keep the lumen open, a stent is placed inside the bocfy. A stent is a small mesh-like tubular scaffold placed inside the coronaiy arteiy... 

HoUow-fiber membranes, therefore, may be divided into two categories (/) open hoUow fibers (Eigs. 2a and 2b) where a gas or Hquid permeates across the fiber waU, while flow of the lumen medium gas or Hquid is not restricted, and (2) loaded fibers (Eig. 2c) where the lumen is flUed with an immobilized soHd, Hquid, or gas. The open hoUow fiber has two basic geometries the first is a loop of fiber or a closed bundle contained ia a pressurized vessel. Gas or Hquid passes through the smaU diameter fiber waU and exits via the open fiber ends. In the second type, fibers are open at both ends. The feed fluid can be circulated on the inside or outside of the relatively large diameter fibers. These so-caUed large capiUary (spaghetti) fibers are used in microfUtration, ultrafUtration (qv), pervaporation, and some low pressure (<1035 kPa = 10 atm) gas appHcations. 

Lichtung,/. clearing, etc. (see lichten) opening (Biol.) lumen. lichtvoU, a. luminous, lucid. 

Many antihypertensive drug lower the blood pressure by dilating or increasing the size of the arterial blood vessels (vasodilatation). Vasodilatation creates an increase in the lumen (the space or opening within an arteiy) of the arterial blood vessels, which in turn increases the amount of space available for the blood to circulate Because blood volume (the amount of blood) remains relatively constant, an increase in the space in which the blood circulates (ie, the blood vessels) lowers the pressure of the fluid (measured as blood pressure) in the blood vessels. Although the method by which anti-hypertensive drug dilate blood vessels varies, the result... 

Atresia Congenital absence of a normal opening or normally patent lumen. 

Animal cells are separated from each other by lipid membranes. During signal transduction this barrier has to be passed, which can be realized by permanently or temporarily opened channels or by an indirect mechanism without material flux between the extra- and intracellular lumen (Fig. 1). 

When the cell wall is fully swollen, the micropores are open and the interior of the cell wall can be accessed by entities that are smaller than the diameter of the micropores. When wood is dried from a water-saturated condition, as water is removed the lumen and other macrovoids, and then subsequently the ceU wall, lose moisture. As the water is removed, the micropores begin to collapse, and this process continues until the wood is dry. 

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