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a. a period of history marked by some feature or characteristic; era
b. (capital when part of a name): the Middle Ages; the Space Age
2. Geology palaeontol
a. a period of the earth's history distinguished by special characteristics
b. the period during which a stage of rock strata is formed; a subdivision of an epoch
3. Myth any of the successive periods in the legendary history of man, which were, according to Hesiod, the golden, silver, bronze, heroic, and iron ages
4. Psychol the level in years that a person has reached in any area of development, such as mental or emotional, compared with the normal level for his chronological age
5. of age adult and legally responsible for one's actions (usually at 18 or, formerly, 21 years)



in humans, a stage of development that is characterized by specific regularities of formation of the organism and personality and by relatively stable morphophysiological and psychological traits. While age is a stage in the biological maturing of the organism, a process controlled by genetic factors, it is also a concrete result and stage of the social-psychological development of the personality and is determined by the conditions of life, training, and upbringing.

The content and form of training and upbringing are historically composed and varied according to age; in their turn they affect the determination of the boundaries and possibilities of a given age. In contemporary pedagogy and developmental psychology, several ages are differentiated with respect to the known relationships of the boundaries: infancy (from birth to one year); pre-preschool, or early childhood (from one to three); preschool (from three to seven); early school age (from seven to ten years); juvenile, or middle school (from ten to 15); and late school, or early youth (15 to 18 years old). Beyond these limits there is no generally accepted classification in the literature; only old age is considered separately. With the increased longevity noted in the 20th century, gerontology and gerontopsychology have arisen as disciplines to study the problems of prolonging the active life of a human being. Each age has a characteristic structure of cognitive, emotional, and volitional properties and qualities; forms of behavior; types of relationships to the environment; and peculiarities of structure and functioning of various organs and systems of the organism. This structure, however, is not invariable: in the 20th century a general acceleration of the physical and mental development of children has been noted. On the other hand, educational theory, in solving the problem of optimizing training, widens the possibilities of age and the boundaries of acquiring knowledge. Training must take into account not only the level of development achieved but also the development perspectives (the concept of “zones of imminent development,” as formulated by L. S. Vygotskii): the teacher must know not only what is present in a child of a given age but also what can be achieved, given certain conditions, by the child in the near future.



Period of time from origin or birth to a later time designated or understood; length of existence.
Any one of the named epochs in the history of the earth marked by specific phases of physical conditions or organic evolution, such as the Age of Mammals.
One of the smaller subdivisions of the epoch as geologic time, corresponding to the stage or the formation, such as the Lockport Age in the Niagara Epoch.


(aerospace engineering)
References in periodicals archive ?
Advanced glycation end products have been found related with the pathogenesis of many neurologic diseases (Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, peripheral diabetic retinopathy).
2012, Screening system of blocking agents of the receptor for advanced glycation end products in cells using fluorescence.
Soluble receptor for advanced glycation end products in patients with decreased renal function," American Journal of Kidney Diseases, vol.
Receptor for advanced glycation end products is a receptor for a family of about 20 related calciumbinding proteins that are only expressed in vertebrates.
There is also substantial evidence for a direct link between renin-angiotensin system and advanced glycation end products [2124].
Serum carboxymethyl- lysine, a dominant advanced glycation end product, is associated with chronic kidney disease: the Baltimore longitudinal study of aging.
Advanced glycation end products (AGEs) are a heterogeneous group of protein and lipids to which sugar residues are covalently bound.
These products may be fluorescent and yellowbrown in color; some can form stable intermolecular and intramolecular cross-links called advanced glycation end products (AGEs).
Advanced glycation end products in diabetes-associated atherosclerosis and renal disease: interventional studies, Annual New York Academic Science, 1043: 759-766.
Receptor for advanced glycation end products (RAGE) mRNA was increased by ozone + DEP, and exposure to ozone or DEP depleted cardiac mitochondrial phospholipid fatty acids (DEP > ozone).

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