#biophysics

• Aberroscope — An optical instrument or diagnostic device historically used, or applied in biophysics experiments, for observing, visualizing, and qualitatively assessing spherical and chromatic aberrations of the eye or a lens system. The device typically employs a shaded micrometric grid (aberroscopic grid) through which a light beam passes, allowing the examiner or the patient to directly perceive geometric distortions on the retina or a projection screen.
• Actinobiology — An interdisciplinary branch of biology dealing with the structural and physiological study of the effects produced by luminous, ultraviolet, x-ray, or nuclear radiation on living organisms and cellular macromolecules. Actinobiology analyzes both adaptive mechanisms or genetic mutations induced by radiant fluxes in the environment, as well as therapeutic applications or ecological risks determined by exposure to various sources of electromagnetic energy.
• Aerotonometry — An experimental method or clinical laboratory procedure used to determine and measure the tension or partial pressure of gases (oxygen, carbon dioxide) dissolved in biological fluids, especially in blood, by equilibrating them with a determined volume of air or gas mixture. This structural process provides essential data for evaluating respiratory function and alveolocapillary gas exchanges.
• Autoradiography — A biophysical method of investigation and structural imaging consisting of detecting and recording the spatial distribution of radioactive substances or isotope-labeled molecules (tracers), by directly exposing the biological or metallurgical sample onto a photographic emulsion or a digital sensor. This experimental process utilizes the self-emission of radiation (alpha, beta, or gamma) from the sample to expose the contact medium, serving as a fundamental technique in nucleic acid mapping, cellular metabolism studies, and protein localization.
• Auxotonie — A physiological phenomenon or process consisting of a muscular contraction during which the internal tension of the fibers progressively increases concurrently with the shortening of their length; a mechanical activity regimen characteristic of the myocardium during the blood ejection phase or skeletal muscles overcoming a variable elastic resistance.