Рубрика:
61
Fortunately, recent instrumentation advances, including high intensity, tunable,
titanium-sapphire lasers and back-thinned, liquid nitrogen cooled CCD detectors,
have once again brought C.V. Raman and his "effect" to the scientific forefront. The
Raman spectra we analyze today using this advanced instrumentation look little like
the bands Raman and Krishnan first saw in their Calcutta laboratory. The Raman
bands in these modern spectra represent a chemical fingerprint of the molecular
species examined.
Raman spectroscopy had its first biomedical impact in the fields of biochemistry and
biophysics, where it was used for key chemical and structural studies of DNA, lipid
membranes, hemoglobin and enzymes. However, perhaps its greatest impact will be
in clinical medicine. It is now being used to probe intact living cells and tissues. In
fact, Raman techniques are currently being developed for painless transcutaneous
monitoring of blood glucose in diabetics, identification of vulnerable atherosclerotic
plaques in the coronary arteries of patients at risk for heart attacks and the real time in
vivo diagnosis of breast cancer.
Raman spectroscopy has become a popular tool in industry; it is now used for quality
control in the manufacture of starchy foods.
Notes:
• scattering - рассеивание; рассыпание; разбрасывание
• intact - нетронутый; незатронутый, неповреждённый
Task 1. Make as many derivatives for each word as you can and translate them.
Color, physics, important, vibrate, explain, reflect, depend, discover, radiate,
examine, develop.
Task 2. Divide the text into its logical parts and title them.
Task 3. Find the main idea of each part.
Task 4. Explain “Raman effect” in your own words.
Task 5. Compress the text.
Task 6. Topics for discussion
1. What do you know about C.V. Raman?
2. What history of other important discoveries can you tell?
Страницы
- « первая
- ‹ предыдущая
- …
- 59
- 60
- 61
- 62
- 63
- …
- следующая ›
- последняя »
