Encyclopedia-Y

 
YAC
 Definition From the abbreviation of the English term: yeast artificial chromosome (yeast artificial chromosome), it is a chromosome in yeast, playing the role of vector, allowing the cloning of DNA (Saccharomyces cerevisiae) of large size. It is within this chromosome DNA was introduced that one wishes to replicate (clone). ...
Y chromosome
 Definition It is also called sexual chromosome hétérochromosome (term originally designating one different chromosome by its form, its size and its behavior). It is part of the chromosomes are at the origin of sex determination (X and Y). Thus, women have two X chromosomes, males have one X chromosome associated with a chromosome Y. Physiology...



Yttrium
 Definition Chemical element symbol Y, 88,905 atomic mass and atomic number 39. Yttrium is the rare-earth group. This molecule is used in its stable form (i.e. non-radioactive) for the operation of certain lasers known as YAG (yttrium and aluminum Garnet laser). It is mostly ophthalmologists, respirologists and gastroenterologists who use this...
Yersinia, yersiniosis
 Definition Type of bacterium belonging to the family of Enterobacteriaceae and comprising three species that can cause disease: Yersinia enterocolitica Yersinia pseudo-tuberculosis Yersinia pestis responsible for plague (bacilli of Yersin) these bacteria in the form of rods (bacilli) are stainable by negative Gram stains. Yersiniosis is an infection...



Yoga
 Definition Judgment of the fluctuations of the thought Discipline who, unlike what may believe is not therapy, characterized by a philosophical component whose goal is to move towards a goal that is the purpose of human existence. Yoga includes spiritual and bodily exercises in direct relation to this philosophy. History It is during the Vedic...
Yoyo
 Definition It is a device in the form of a yo-yo (toy), placed in the tympanic membrane, allows to communicate (part located ear behind the eardrum) middle ear with the external ear (part of the ear with the auricle of the ear) through the tympanic (eardrum) membrane. Thus obtained is responsible for eliminating secretions of the middle ear. Causes...



Yunis-Varon syndrome of
 Definition All of malformations, very rare, which is done according to autosomal recessive transmission (it is sufficient that one of the two parents pass genetic anomaly that the child has the disease) and whose prognosis is often fatal. Symptoms Statural delay (insufficient growth) Malformations of fingers and toes (lack of development of the inch...