11 Result(s) for 'SubCategory='Biophysics''
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   Chapter DOI:10.5005/jp/books/11603_1      

The interaction between macromolecules, solutes, solvents, electrolytes and colloids in human body has been analysed in this chapter. The most important physical forces at work in living system include osmotic pressure, surface tension and viscosity. Any disturbance in the action of these forces inflicts illness that often comes to the attention of an astute... [More]

Chapter-02 Pressure in Fluids: Its Measurement and Implications by Parkash Parveen (1998) Edition : 1/e

Pressure measurement has remained an important and feasible adjunct to clinical practice and scientists have sought better ways to measure it from desired points in the human body. Successful pressure monitoring has acquired an established role as it permits the accurate evaluation of the stage of the disease in heart, lung or other organ. This chapter is de... [More]

Chapter-03 Biomechanics of Muscle Contraction by Parkash Parveen (1998) Edition : 1/e

Muscle is the largest single tissue in human body, comprising more than 40% body mass in adults. The contraction of muscles is the most apparent and dramatic macroscopic signs of life and have therefore excited the imagination since the times of ancient. It is ironic that after using muscles day and night, for many thousands of years homo-sapiens still does ... [More]

   Chapter DOI:10.5005/jp/books/11603_4      

Membranes are asymmetric sheet like enclosed structures with an inside and an outside. These sheet like structures are thermodynamically stable but electrically and metabolically active. By forming closed compartments around cellular protoplasm, membranes separate one cell from another, thus permitting cellular individuality. Membranes act as barrier, with s... [More]

   Chapter DOI:10.5005/jp/books/11603_5      

The association of electricity with medical sciences dates back to the 18th century when Galvani demonstrated that most of physiological processes were accompanied with electrical changes. The electric field generated by the action of nerve and muscle cells constitute bioelectric signal. This chapter discusses various aspects of the electrical signals which ... [More]

   Chapter DOI:10.5005/jp/books/11603_6      

Dynamics of blood flow through body was investigated by French physicist and physician J.L.M Poiseuille in 1799. As the blood vessels are not rigid and fluid flowing through them is non-newtonian the Poiseuille’s law does not apply as such to flow of blood through vascular system. This chapter highlights principles of flow dynamics in human body. Differences... [More]

   Chapter DOI:10.5005/jp/books/11603_7      

Wilhelm Roentgen’s reported X-rays in 1890. Today, imaging with X-rays is perhaps the most commonly used diagnostic tool with medical profession. X-ray unit is in fact a life line of any working hospital. This chapter carries information on x-rays tube and its maintenance and working of x-ray machine with electric circuit. Further, mechanism of X-rays produc... [More]

   Chapter DOI:10.5005/jp/books/11603_8      

Radioactive tracers have been in use in medical diagnostics for a long time and even today, the thyroid gland continues to be most frequently examined organ in nuclear medicine. Over 10,000 hospitals worldwide use radioisotopes in medicine, and about 90 per cent of the procedures are diagnostic. Radioisotope is characterized by the type and energy of radiati... [More]

   Chapter DOI:10.5005/jp/books/11603_9      

Nuclear magnetic resonance has emerged as a powerful non-invasive imaging technique in the medical field. It uses magnetic fields and radio frequency signals to obtain anatomical information about the human body as cross sectional images in any desired direction and can easily discriminate between healthy and diseased tissue. Nuclear magnetic resonance image... [More]

Chapter-10 Microscopes: Physical Principles and Applications by Parkash Parveen (1998) Edition : 1/e

Microscopes have a specialized use in biological research and clinical diagnosis because they possess characteristics of magnification and resolving power. The capacity of microscope both to magnify and resolve depends on kind of illumination and type of lenses used. Compound light microscope permits gross examination of cellular structure and is an attracti... [More]