Folding in Pieces

Two Pieces by Dewey 1 Running head : TWO PIECES BY DEWEY Reflections on Two Pieces

Transfer RNA genes in pieces.

The short genes encoding transfer RNA (tRNA) molecules are highly conserved in both sequence and structure, reflecting the central role of tRNA in protein biosynthesis. The frequent occurrence of fragmented intron-containing tRNAs that require processing to form contiguous molecules is therefore surprising. Recent discoveries of permuted and split tRNA genes have added to the apparent creativit...

Focus: Missing Pieces

Stem Cells and Cancer: The Medical Mystery of the 21st Century Cancer, which is characterized by abnormal cell proliferation that leads to uncontrolled tumor growth, is a leading cause of death worldwide (7.4 million deaths in 2004). Scientists have focused on the biological mechanism of tumor formation in an attempt to develop well-informed, effective cancer treatments that slow or halt the pr...

Pulling the Pieces Together:

Covering with Rectangular Pieces

The practical problem we are trying to model is: we have to cover a room with a material(carpet or linolleum). This material is in a roll of fixed width. We want to cover the room with a minimum number of pieces and to waste a minimum amount of material. We present in this paper a synthesis of our works. We can easily see that the two criteria, the minimum loss of material and the minimumnumber...