The alpha helix (Î±-helix) is a common secondary structure of proteins and is a righthand-coiled or spiral conformation (helix) in which every backbone N-H group donates a hydrogen bond to the backbone C=O group of the amino acid four residues earlier (hydrogen bonding).his secondary structure is also sometimes called a classic PaulingâCoreyâBranson alpha helix (see below). The name 3.613-helix is also used for this type of helix, denoting the number of residues per helical turn, and 13 atoms being involved in the ring formed by the hydrogen bond.
For other uses, see LPN (disambiguation) . A licensed practical nurse (LPN) in much of the United States and most Canadian provinces is a nurse who cares for people who are sick, injured, convalescent, or disabled. LPNs work under the direction of registered nurses or physicians.or other uses, see LPN (disambiguation) . A licensed practical nurse (LPN) in much of the United States and most Canadian provinces is a nurse who cares for people who are sick, injured, convalescent, or disabled. LPNs work under the direction of registered nurses or physicians.
First of all, LPN is an acronym that stands for licensed practical nurse. Forty-eight American states and most of the the Canadian provinces utilize the title of LPN. The remaining two states in the union (California and Texas) use the acronym LVN, which stands for licensed vocational nurse.PNs can and do work in acute care hospitals, although this type of employment seems to be on the decline in many regions in the United States due to issues surrounding scope of practice.