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Positive Feature: [About 200,000 marriages each year in the are potentially dangerous biochemical smatches. In such marriages, the wife is negative; that is, she lacks the Rh factor at is present in the blood of about 85% of Bucasians and 95% of Negroes in the U.S.; the sband has the factor and is Rh-positive feature. This erence in blood factors, which complicates out one pregnancy in 250, rarely affects the Bt pregnancy unless the Rh-negative woman i been previously sensitized with Rh-positive feature pod, for example, by transfusion. iDuring pregnancy, if an Rh-negative mother |carrying a baby who has inherited Rh-positive feature od from an Rh-positive feature father, a few of the y's blood cells may seep into the mother's 1 This is usually not enough, however, to gger the mother's immunological response.
That's one reason why the feature photography field remains comparatively uncrowded, despite its obvious advantages over spot news coverage. It's easier for the cameraman to come up to the standards of news photography than to those of feature photography. There are many photographers perfectly capable of doing features, and who would like to do them, who never get into the field for the simple reason that they don't ever see the opportunities all around them for feature pictures. They lack the knack, something akin to the "nose for news" mentioned in the previous chapter, to recognize feature picture material.
Under the influence of an electric field, an electron from a neighboring silicon atom may be forced to fill the hole, leaving a new hole at its point of origin. As electrons move to fill the hole, the hole appears to travel through the crystal in the direction opposite to that of the electron flow. Because these holes act in every respect like positive feature charges, silicon containing holes is termed p-type (positive feature-type) to indicate a positive feature charge. |
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