proto-, prot- +
(Greek: first; foremost, front, earliest form of, original, primitive; chief, principal; usually used as a prefix)
Protopathic sensibility is transmitted principally along the thinnest nerve fibers, which lack a myelin sheath and conduct nerve impulses slowly.
It is related primarily to the spinothalamic system (extending between the spinal cord and the thalamus which is the large oval area of gray matter within the brain that relays nerve impulses from the basal ganglia to the cerebellum, both parts of the brain that control and regulate muscle movement), whose receptive neuron fields are often nonspecific and very large, covering the entire body.
The protophytes (Protophyta) are by some botanists considered an independent branch or class of the vegetable kingdom, and made to include the lowest forms of both fungi and algae; such as, slime molds, Bacteria, the nostocs, etc.
It may eventually develop into orbiting celestial bodies; such as, planets and asteroids.
Composed of proteins, fats, and other molecules suspended in water, it includes the nucleus and cytoplasm.2. The colorless liquid or jelly contents of a living cell, composed of proteins, fats, and other organic substances in water and which is regarded as the physical basis of all living matter and life functions.
At first, Czech physiologist Jan Evangelista Purkinje gave the name protoplasm to the living material within the cell, in 1839.
He referred specifically to the gelatinous embryonic material in an egg because this first-formed material reminded him of the word protoplasm which was used to describe Adam, the first formed man, in the Bible.
2. A reference to protoplasm, the substance of which animal and vegetable cells are formed.
3. Consisting of, or resembling, protoplasm which is the entire contents of a live cell.
2. The living portion of a cell considered as a unit which includes the cytoplasm, the nucleus, and the plasma membrane. 3. A plant, fungal, or bacterial cell that has had its cell wall removed. 4. The living substance of a plant or bacterial cell, excluding the cell wall.
2. A celestial object made of a contracting cloud of interstellar medium (mostly hydrogen gas) which eventually becomes a main-sequence star.
Less massive protostars may take hundres of millions of years to evolve into stars; massive ones contract more quickly and may take only a few hundred thousand years to evolve.
2. A simple type of stele in which a central core of xylem is surrounded by a cylinder of phloem (inner fibrous bark of certain trees).
At this stage of development, the later specialization of any given embryonic cell has already been determined.
Protostomes are on of the two groups of animals having a true body cavity (coelom) and are believed to share a common ancestor. They include the mollusks (nails, slugs, clams, mussels, cuttlefish, and octopuses), annelids (segmented worms, earthworms, lugworms, and leeches), and arthropods (insects; including mosquitoes, ticks, centipedes, spiders and many other species).
It has been applied to the early period of infancy, when the child has no awareness of himself or herself as being distinct from others and no real concept of time or space.