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Biphasic Pulse
Biphasic, meaning having two phases, may refer to: * Phase (matter), in the physical sciences, a biphasic system, e.g. one involving liquid water and steam * Biphasic sleep, a nap or siesta in addition to the usual sleep episode at night * Phase (pharmacology) * Biphasic disease * Biphasic formulations of oral contraceptive pills See also * Biphase (other) * Phase (other) Phase or phases may refer to: Science *State of matter, or phase, one of the distinct forms in which matter can exist *Phase (matter), a region of space throughout which all physical properties are essentially uniform *Phase space, a mathematica ...
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Phase (matter)
In the physical sciences, a phase is a region of material that is chemically uniform, physically distinct, and (often) mechanically separable. In a system consisting of ice and water in a glass jar, the ice cubes are one phase, the water is a second phase, and the humid air is a third phase over the ice and water. The glass of the jar is a different material, in its own separate phase. (See .) More precisely, a phase is a region of space (a thermodynamic system), throughout which all physical properties of a material are essentially uniform. Examples of physical properties include density, index of refraction, magnetization and chemical composition. The term ''phase'' is sometimes used as a synonym for state of matter, but there can be several immiscible phases of the same state of matter (as where oil and water separate into distinct phases, both in the liquid state). Types of phases Distinct phases may be described as different states of matter such as gas, liquid ...
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Biphasic Sleep
Polyphasic sleep is any sleep of multiple periods in the course of 24 hours. Polyphasic usually means more than two periods of sleep, whereas biphasic (or diphasic, bifurcated, or bimodal) sleep, means solely two periods of sleep. Its opposite is monophasic sleep, one period of sleep within 24 hours. The term ''polyphasic sleep'' was first used in the early 20th century by psychologist J. S. Szymanski, who observed daily fluctuations in activity patterns. While today monophasic sleep is considered the norm, historical analysis suggests that polyphasic nighttime sleep, as in the sense of segmented sleep, was common practice across societies before industrialization. Although simians are monophasic, polyphasic sleep is common among animals, and is believed to be the ancestral sleep state for mammals. Beside polyphasic nighttime sleep a common simple practice of biphasic or polyphasic sleep is having a nap, a short period of sleep during daytime, as an addition to nighttime sleep pra ...
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Phase (pharmacology)
Drug metabolism is the metabolic breakdown of drugs by living organisms, usually through specialized enzymatic systems. More generally, xenobiotic metabolism (from the Greek xenos "stranger" and biotic "related to living beings") is the set of metabolic pathways that modify the chemical structure of xenobiotics, which are compounds foreign to an organism's normal biochemistry, such as any drug or poison. These pathways are a form of biotransformation present in all major groups of organisms and are considered to be of ancient origin. These reactions often act to detoxify poisonous compounds (although in some cases the intermediates in xenobiotic metabolism can themselves cause toxic effects). The study of drug metabolism is the object of pharmacokinetics. Metabolism is one of the stages (see ADME) of the drug's transit through the body that involves the breakdown of the drug so that it can be excreted by the body. The metabolism of pharmaceutical drugs is an important aspect ...
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Biphasic Disease
A biphasic disease is a disease which has two distinct phases or components. In clinically biphasic diseases, the phases are generally chronologically separated. In histopathologically biphasic tumors (also called biplastic tumors), there is neoplastic A neoplasm () is a type of abnormal and excessive growth of tissue. The process that occurs to form or produce a neoplasm is called neoplasia. The growth of a neoplasm is uncoordinated with that of the normal surrounding tissue, and persists ... tissue which contains two different cellular elements. Examples Clinically biphasic diseases Tumor biplasia References {{Reflist Diseases and disorders ...
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Oral Contraceptive Formulations
Birth control pills come in a variety of formulations. The main division is between combined oral contraceptive pills, containing both estrogens and synthetic progestogens (progestins), and progestogen only pills. Combined oral contraceptive pills also come in varying types, including varying doses of estrogen, and whether the dose of estrogen or progestogen changes from week to week. Mechanism of action Combination pills usually work by preventing the ovaries from releasing eggs (ovulation). They also thicken the cervical mucus, which keeps sperm from penetrating into the uterus and joining with an egg. The hormones in combination and progestogen-only pills also thin the lining of the uterus. This could prevent pregnancy by interfering with implantation of a blastocyst. Main action in typical use is prevention of ovulation. Combined oral contraceptive pills All contain an estrogen, ethinylestradiol Ethinylestradiol (EE) is an estrogen medication which is used widely in b ...
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Biphase (other)
Biphase or Bi-phase may refer to: * Biphase modulation, or binary phase-shift keying * Differential Manchester encoding, also known as Aiken biphase or biphase mark code * Harvard biphase, used to encode data onto magnetic tape * Mu-Tron Bi-Phase ''Musitronics'', often shortened to Mu-tron, was a manufacturer of electronic Effects unit, musical effects active in the 1970s. Founded by Mike Beigel and Aaron Newman, the company's products provided filtering and processing effects and were ..., a musical effects device See also * Biphasic (other) {{disambiguation ...
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