- 1. the partially shaded outer region of the shadow cast by an opaque object.
In pathology and anatomy the penumbra is the area surrounding an ischemic event such as thrombotic or embolic stroke. Immediately following the event, blood flow and therefore oxygen transport is reduced locally, leading to hypoxia of the cells near the location of the original insult.
May 07, 2018 · As Atkinson and Brandolini gently put it: “There is…a certain penumbra surrounding the definition of middle class.” 1 The edited volume in which their essay appears contains no fewer than ...
Griswold v. Connecticut: A right to privacy can be inferred from several amendments in the Bill of Rights, and this right prevents states from making the use of contraception by married couples illegal.
Jun 26, 2022 · ischemic penumbra. Ischemic penumbra is tissue which surrounds the core infarct. The ischemic penumbra is malperfused and nonfunctional, but the tissue is still potentially viable if blood supply can be restored. The ischemic penumbra is often maintained by a trickle of blood flow supplied via collateral circulation.
The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. Assuming no diffraction , for a collimated beam (such as a point source) of light, only the umbra is cast.
Jan 22, 2012 · Roe v. Wade: A person may choose to have an abortion until a fetus becomes viable, based on the right to privacy contained in the Due Process Clause of the Fourteenth Amendment. Viability means the ability to live outside the womb, which usually happens between 24 and 28 weeks after conception.
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