Dilated pores

The patient shovm in Figure 5.1, who is approaching 40, has a few lentigines and a thick and oily skin with dilated pores. There are no wrinkles, but a slight sagging of the skin that is only noticeable in a standing position. 

Dilated pores are not the best indication for phenol, and the abrasive technique combined with Easy TCA seems more effective. 

Benatar describes this complication when doing deep-peel treatments on patients with thick, oily skins and dilated pores. The results of deep peels - and especially medium peels - are mediocre compared with the dramatic results seen when treating drier and thinner skins. Thick, oily skin with dilated pores benefits more from ablative laser resurfacing than a peel, even a deep one. 

In packed beds of particles possessing small pores, dilute aqueous solutions of hydroly2ed polyacrylamide will sometimes exhibit dilatant behavior iastead of the usual shear thinning behavior seen ia simple shear or Couette flow. In elongational flow, such as flow through porous sandstone, flow resistance can iacrease with flow rate due to iacreases ia elongational viscosity and normal stress differences. The iacrease ia normal stress differences with shear rate is typical of isotropic polymer solutions. Normal stress differences of anisotropic polymers, such as xanthan ia water, are shear rate iadependent (25,26). 

Stock et al. used P4HB scaffolds and tissue engineered the patch with a porosity of 95% and pore sizes in the range of 180-240 p,m by salt-leaching and solvent evaporation. The sheep autologous cells (endothelial, smooth muscle, and fibroblast cells) were seeded on the scaffold before implantation. Results confirmed that the cell-seeded implants induced progressive tissue regeneration with no thrombus formation, stenosis, or dilatation. 

As for Salty I am apt to think that there is one chief, of which all the rest are compounded, and to conceive it to be made of an Acid liquor sliding through the Veins of the Earth, which doth insensibly insinuate and incorporate in the Pores of stones, which it does dilate and attenuate afterwards by a long fermentation and concoction of several years, a salt comes to be formed, that is called fossile and this Opinion is the more likely to be true, because from the mixture of Acids and some Alkali matter, we always draw a substance very like unto Salt. Now stones are an Alkali. I add that the long fermentation, and concoction which is made in the stone, serves to digest, and perfectly to unite the Acid with the stony parts, for the making of Salt. ... 

For a porous medium represented by the phase function /g(r), we define the covering radius rc(r) of the solid phase as the radius of the largest sphere (or disk in 2D porous media) placed entirely into the solid phase and covering the point with coordinates r. The value of rc is zero inside the pores. The covering radius rc can be found by the morphological operation called opening, i.e., the erosion followed by the dilatation. The dilatation of the solid-phase domain A by the spherical element Br with radius r is the set A B, covered by all translations of Br centered in A,... 

Acknowledging the difficulty in imagining that a matter so subtle and so active as fire could be arrested in the body, Lemery reasoned that it required a certain quantity of fire to overcome the resistance of a solid body and to rupture the union of its parts. In smaller quantity, the matter of fire had less force and became contained in the solid body. A solid body subjected to fire opened and dilated its pores, which allowed an easy passage for the matter of fire however, these pores returned to their original state once the fire ceased to operate on the body. The fire intro-... 

Mechanical effects become important in massive shale top seals where the pore throats in the seal rock are commonly so small that the seals may only leak after hydrofracturing, or by forming linked, permeable, dilatant fractures during deformation. The key... 

Subsurface tension fractures will form when the minimum effective stress (CTj) reduces to the tensile strength of the rock (-C,). This will occur when the minimum total stress (S3) is reduced by tectonic dilation, or pore fluid pressure is increased (Watts, 1987). These failure conditions can be summarised as follows ... 

Although seal failure caused by fracturing results from the interplay of pore-pressure and tectonic deformation, it is useful from the point of view of risk analysis to consider them separately as tectonic breaching (caused by tectonically-induced dilation), and hydraulic breaching (caused by increase in pore-pressure). 

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