gray

Examples of gray in the following topics:

• Grey and White Matter

  • The basic pattern of the CNS is a central cavity surrounded by gray matter made up of neuronal cell bodies external to which is the white matter which is made up of myelinated axons.
  • The basic pattern of the CNS is a central cavity surrounded by gray matter external to which is the white matter.
  • The spinal cord exhibits this basic pattern, but the brain has additional regions of gray matter not present in the spinal cord.
  • Both the cerebrum and cerebellum have an outer additional layer of gray matter.
  • Gray matter is a major component of the central nervous system, consisting of neuronal cell bodies.  

• The Graying of America

  • The graying of America has contributed to the higher concentration of the elderly in certain areas of the United States.

• The Payne Rearrangement

  • The first diagram below illustrates three such reactions, and a general mechanism is written in the gray-shaded box.
  • The course of reaction in the absence of the Payne rearrangement is displayed in the gray-shaded box.

• Measuring Radiation Exposure

  • Dose is reported in gray (Gy) for matter or sieverts (Sv) for biological tissue, where 1 Gy or 1 Sv is equal to 1 joule per kilogram.
  • Define the terms used to define radiation exposure, the gray (Gy) and sievert (Sv)

• Cerebral Cortex

  • The cerebral cortex, the largest part of the mammalian brain, is the wrinkly gray outer covering of the cerebrum.
  • The cerebrum is composed of gray and white matter.
  • Gray matter is the mass of all the cell bodies, dendrites, and synapses of neurons interlaced with one another, while white matter consists of the long, myelin-coated axons of those neurons connecting masses of gray matter to each other.

• Subdivisions of the Nervous System

  • The nervous system is often divided into components called gray matter and white matter.
  • Gray matter, which is gray in preserved tissue but pink or light brown in living tissue, contains a relatively high proportion of neuron cell bodies.
  • Gray matter is found in clusters of neurons in the brain and spinal cord and in cortical layers that line their surfaces.
  • By convention, a cluster of neuron cell bodies in the gray matter of the brain or spinal cord is called a nucleus, whereas a cluster of neuron cell bodies in the periphery is called a ganglion.

• Radiation

  • Similarly, black asphalt in a parking lot will be hotter than the adjacent gray sidewalk on a summer day, because black absorbs better than gray.
  • The reverse is also true—black radiates better than gray.
  • Thus, on a clear summer night the asphalt will be colder than the gray sidewalk because black radiates energy more rapidly than gray.
  • Gray objects have a uniform ability to absorb all parts of the electromagnetic spectrum.
  • In other words, it does not matter whether the surroundings are white, gray, or black; the balance of radiation into and out of the object depends on how well it emits and absorbs radiation.

• Unity and Variety

  • According to traditional color theory (based on subtractive primary colors and the RYB color model), yellow mixed with violet, orange mixed with blue, or red mixed with green produces an equivalent gray and compose the painter's complementary colors.
  • The contrast, as traced by etymologies in the Oxford English Dictionary, seems related to the observed contrast in landscape light, between the "warm" colors associated with daylight or sunset and the "cool" colors associated with a gray or overcast day.
  • Cool colors, on the other hand, are the hues from blue green through blue violet, with most grays included.
  • Pure achromatic colors include black, white and all grays; near neutrals include browns, tans, pastels and darker colors.
  • Next to a bright red couch, a gray wall will appear distinctly greenish.

• Spinal Cord White Matter

  • White matter is the tissue through which messages pass between different areas of gray matter within the nervous system.
  • Using a computer network as an analogy, the gray matter can be thought of as the actual computers themselves, whereas the white matter represents the network cables connecting the computers together.
  • The brain in general (and especially a child's brain) can adapt to white-matter damage by finding alternative routes that bypass the damaged white-matter areas, and can therefore maintain good connections between the various areas of gray matter.
  • Aggregates of gray matter such as the basal ganglia and brain stem nuclei are spread within the cerebral white matter.
  • "Type 1 astrocytes" had a fibroblasts appearance and resided in both gray matter and white matter.

• Spinal Cord Compression

  • Emergency radiation therapy (usually 20 Gray in five fractions, 30 Gray in 10 fractions or eight Gray in one fraction) is the mainstay of treatment for malignant spinal cord compression.