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Loss of detectable antigen from the surface of a cell after incubation with antibodies. This is one method in which some tumors escape detection by t…

Change in the surface ANTIGEN of a microorganism. There are two different types. One is a phenomenon, especially associated with INFLUENZA VIRUSES, w…

Nucleotide sequences that are found in the PROMOTER REGIONS of the genes of stress-responsive and cytoprotective proteins, such as those encoding ant…

Asexual reproduction resulting in the formation of viable seeds from FLOWERS without fertlization (i.e. use of POLLEN). Progeny plants produced from …

A regulated cell death mechanism characterized by distinctive morphologic changes in the nucleus and cytoplasm, including the endonucleolytic cleavag…

Physiologic mechanisms which regulate or control the appetite and food intake.

The blood pressure in the ARTERIES. It is commonly measured with a SPHYGMOMANOMETER on the upper arm which represents the arterial pressure in the BR…

Pain in the joint.

Measurements of joint flexibility (RANGE OF MOTION, ARTICULAR), usually by employing an angle-measuring device (arthrometer). Arthrometry is used to …

Theory and development of COMPUTER SYSTEMS which perform tasks that normally require human intelligence. Such tasks may include speech recognition, L…

Beverages sweetened with SWEETENING AGENTS that are synthetic or artificial as opposed to naturally-occurring. Examples of sweetening agents include …

Aggregates of matter in outer space.

Aggregates of matter in outer space, such as stars, planets, and comets; their properties; and the processes they undergo.

Unequal cell division that results in daughter cells of different sizes.

A nucleic acid sequence that contains an above average number of ADENINE and THYMINE bases.

DNA-binding motifs, first described in one of the HMGA PROTEINS: HMG-I(Y) PROTEIN. They consist of positively charged sequences of nine amino acids c…

The gaseous envelope surrounding a planet or similar body. (From Random House Unabridged Dictionary, 2d ed)

The pressure at any point in an atmosphere due solely to the weight of the atmospheric gases above the point concerned.

The hemodynamic and electrophysiological action of the HEART ATRIA.

The hemodynamic and electrophysiological action of the LEFT ATRIUM.

The hemodynamic and electrophysiological action of the RIGHT ATRIUM.

The pressure within the CARDIAC ATRIUM. It can be measured directly by using a pressure catheter (see HEART CATHETERIZATION). It can be also estimate…

Specific loci on both the bacterial DNA (attB) and the phage DNA (attP) which delineate the sites where recombination takes place between them, as th…

RNA sequences composed of ADENINE NUCLEOTIDES and URACIL NUCLEOTIDES, that are located in the 3'UNTRANSLATED REGIONS of MESSENGER RNA molecules that …

The ability to hear and distinguish one SOUND from another. These are typically assessed using whisper tests, tuning fork tests, or BONE CONDUCTION t…

The audibility limit of discriminating sound intensity and pitch.

Mode of communication wherein a bound hormone affects the function of the cell type that produced the hormone.

An unsupervised learning technique where the machine learns patterns in unlabeled data sets, makes compressed representations and reconstructs the in…

Process whereby the immune system reacts against the body's own tissues. Autoimmunity may produce or be caused by AUTOIMMUNE DISEASES.

A major activation of the autophagic pathway, characterized by massive accumulation of AUTOPHAGOSOMES and CELL DEATH.