Word: layers
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...recent years, scientists, government officials and the public have become increasingly concerned that man-made and natural chemicals are destroying the ozone layer, the portion of the atmosphere that protects the earth from the sun's deadly ultraviolet radiation...
...serendipitous finding ten years ago by Green made this procedure possible. While studying cultures of a mouse tumor, he found flourishing colonies of cells resembling those of the upper layer of living skin. Investigation showed that these epithelial cells grew because of the presence of fibroblasts, a type of cell common to the connective tissue that makes up the dermis. Green realized that the discovery had implications for burn patients: Cultured skin, derived from the victim, would not be rejected by the body's immune system. Another major advance came when Green discovered that a certain bacterial enzyme could...
...suited to perform what it is asked to do." Ligaments joining the femur and tibia wrap around the knee to keep the bones together; the only cushion between these bones is two thin bands of cartilaginous tissue called menisci. Unlike the shoulder and hip joints, which are buried under layers of muscle, the knee is protected only by the kneecap and a thin layer of tissue. The knee bears great weights, helps propel and stop the body and acts as a shock absorber-and that is just normal wear. Many sports put added strain on the joint. The worst: football...
...simply lounge around all morning in his blue cotton nightshirt on the brick patio overlooking a small, oval swimming pool. His mother, an excellent cook, prepares meals for everyone. By noon of one busy morning, she already had dinner made: a variation on shepherd's pie with layers of potatoes, red onions and scallions, green peas and sautéed turkey, topped by a layer of Jiffy biscuit mix-accompanied, as are most Lewis meals, by corn on the cob and a salad...
...track, which consists of a specially design-synthetic surface placed over a layer of panels, was constructed in late September, and opened just in time for the Crimson's outdoor spring season...