introduction to medicine from biophysical aspect

What is the origin and historical recording period of the term biophysics?

Originates from bio- + physics and was first recorded in 1890–1895.

How is biophysics defined in the context of medicine?

1. The study of biological processes using the theories and tools of physics. 2. The study of physical processes occurring in living organisms.

Why do physical laws apply directly to living organisms?

Living beings are material beings composed of the same fundamental elements as the inanimate world; and physical laws (such as energy conservation) apply to them equally.

What distinction does biophysics make regarding living matter versus physical principles?

Rather than trying to establish new physical principles using living matter; biophysics seeks to explain the principles of living systems using established physical aspects.

Which two great generalizations connect physics and chemistry to biology (Delbrück 1966)?

1. Living matter is composed of the same elements as the inanimate world. 2. The conservation of energy holds true for processes in living matter just as it does in inanimate matter.

Why did early 19th-century scientists believe living organisms were governed by different laws than inanimate matter?

Because living systems are extraordinarily complex (e.g.; a single cell contains ~10^14 atoms) and exhibit unique properties like growth; reproduction; and decay.

What historical milestone in 1828 helped disprove the idea that organic molecules could only be produced by living organisms?

Friedrich Wöhler synthesized urea; demonstrating that organic compounds could be created from inorganic sources.

What biophysical application uses the laws of diffusion in physiology?

Quantitative analysis of passive transport of molecules across permeable cellular and tissue membranes.

How were biophysical techniques instrumental in the discovery of DNA in 1953?

Biophysical methods (specifically X-ray crystallography) solved the 3D structure of DNA; demonstrating how it serves as the molecular blueprint for life.

How do biophysicists track the internal transit system and movement of molecules within living cells?

By using fluorescent tags; allowing cells and molecules to be visualized under light/fluorescence microscopes in real time.

What role do neural networks play in biophysical neuroscience research?

They provide computer models to simulate brain and nervous system activity; clarifying how visual and auditory information is processed.

List key diagnostic imaging techniques developed through biophysics.

Magnetic Resonance Imaging (MRI); Computed Tomography (CT scans); and Positron Emission Tomography (PET scans).

List major medical devices and therapeutic interventions developed with biophysical foundations.

Kidney dialysis; radiation therapy; cardiac defibrillators; pacemakers; and artificial heart valves.

What is the primary focus of environmental biophysics?

Measuring and modeling ecosystems (from the stratosphere to ocean vents); tracking atmospheric pollutants; studying microbial communities; and engineering algae into biofuels.

Name famous historical figures associated with biophysics mentioned in the lecture slides.

Luigi Galvani; Hermann von Helmholtz; Alan Hodgkin & Andrew Huxley; Adolf Eugen Fick; Rosalind Franklin; Maurice Wilkins; James Watson & Francis Crick; Max Perutz & John Kendrew; Allan Cormack & Godfrey Hounsfield; Paul Lauterbur & Peter Mansfield.