14. Describe the conditions that would cause us to see each of the three basic types of spectra. What do we see in the Sunâs spectrum shown on the opening page of this chapter? 18. Describe the Doppler Effect for light and what we can learn from it. What does it mean to say that radio waves are blueshifted? Why does the Doppler Effect widen the spectral lines of rotating objects? Test Your Understanding Each of the following statements makes some type of claim. Decide in each case whether the claim could be
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Alteplase is an enzyme that occurs naturally in man and causes blood clots to dissolve. It is a man-made protein manufactured by recombinant DNA technology. The naturally occurring protein, known as tissue plasminogen activator (TPA), is made by ovarian cells from the Chinese hamster. The amount that is given to patients is far greater than the amount naturally made by the body itself. Alteplase was first approved for heart attacks in 1987. In 1996, it was approved for strokes. PRESCRIBED FOR: Alteplase is used to treat persons with heart attacks (acute myocardial infarctions), strokes, chest pain at rest (unstable angina), blood clots in the lungs (pulmonary thrombosis or embolism), and other less common conditions involving blood clots.