Our knowledge of the circadian clock in plants has advanced considerably in recent years and we now have a clearer view of the biochemical processes making up its mechanism. Recent work provides insight into the central role played by the circadian system in the regulation of many aspects of metabolism. The multiple systems involved in photoreception have been determined, leading to an understanding of how light entrains the internal biological clock to the natural cycle of day and night, and how this impacts on key events in the plant lifecycle, such as the photoperiodic regulation of flowering.
This book, one of a series of information books, introduces the child to a variety of clocks - ancient and modern. It explains in a simple manner how the clock works.
“After an introduction of the scroll saw and general tips, Spielman introduces the 37 artists whose work is presented here, complete with color photographs, detailed instructions, and patterns. Among the projects elegantly yet practically presented are a chess set, a Black Forest clock, Christmas ornaments, bookends, puzzles, tables, and bowls.”—Booklist.
When his father brings home an antique cuckoo clock, Michael is cautioned not to touch it, but he turns back the hands and suddenly he is getting younger by the minute--a year younger to be exact.
Monkeys! Seals! Tigers! Check out these eight action-packed scenes to see what happens during a full day at a busy zoo. In each picture, the zoo buzzes with activity. Visitors, zookeepers, and animals move from place to place. Look for the changes that happen. Keep your eye on the clock too. By spending a whole day in the same place, you can watch events unfold from morning to night. (For ages 5 to 9)
