Sickle cell trait
The condition in which a person has only one copy of the gene for sickle cell (and is called a sickle heterozygote) but does not have sickle cell disease (which requires two copies of the sickle cell gene). If two people with sickle cell trait mate and have children together, each of their children has a 25 percent chance of having sickle cell disease.
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Hemoglobin S, the most common type of abnormal hemoglobin and the basis of both sickle cell trait and sickle cell anemia. Hemoglobin S differs from normal adult hemoglobin (hemoglobin A) only by a single amino acid substitution (There is the substitution of the amino acid valine for the amino acid glutamine in the 6th position […]
- Sickness, acute mountain (AMS)
Acclimatization and Illnesses” by Rick Curtis).
- Sickness, morning
Nausea and vomiting of pregnancy. Morning sickness is a misnomer, because it can occur at any time of the day (though not at night during sleep) and it is not a sickness. It is a normal characteristic of early pregnancy. Morning sickness is now believed to be a good thing since it appears associated with […]
- Sickness, motion
A disorder of the sense of balance and equilibrium and, hence, the sense of spatial orientation that is caused by repeated motion such as from the swell of the sea, the movement of a car, or the motion of a plane in turbulent air. Motion sickness is due to irritation of a portion of the […]
- Siddha medicine
An ancient system of medicine prevalent in South India. The word Siddha comes from the Tamil word for perfection. In Siddha medicine, the individual is a microcosm of the universe. The human body consists of the five primordial elements – earth, water, fire, air and space, the three humours-vatha, pitta and kapha and seven physical […]