Doppler echocardiography. Doppler echocardiography is a procedure that uses ultrasound technology to examine the heart or blood vessels. An echocardiogram uses high frequency sound waves to create an image of the heart while the use of Doppler technology allows determination of the speed and direction of blood flow by utilizing the Doppler effect.
Confidence votes 35. Watermelons are thought to be indigious to Africa where they have been found growing wild. In the 1600s there were watermelon growers in Massachusetts and Florida. Watermelons can be grown almost anywhere but do best in humid areas.I have a freind in Montrael who grows watermelons.He uses black plastic on the ground to amplify the suns heat.n the 1600s there were watermelon growers in Massachusetts and Florida. Watermelons can be grown almost anywhere but do best in humid areas. I have a freind in Montrael who grows watermelons. He uses black plastic on the ground to amplify the suns heat.
Watermelon Types. 1  Watermelon was grown by the ancient Egyptians and it's still evolving today. More than 300 varieties of watermelon are cultivated in the United States and South America, where complementary growing seasons provide a year-round supply of watermelon in an array of shapes, colors and sizes.