Subthalamotomy is a type of brain surgery in which the subthalamic nucleus is destroyed in attempt to help alleviate movement disorders often associated with Parkinsonâs disease. This surgery has been most widely researched at Havana âs International Center for Neurological Restoration (CIREN) located in Cuba.
Alpha is one of five technical risk ratios; the others are beta, standard deviation, R-squared, and the Sharpe ratio. These are all statistical measurements used in modern portfolio theory (MPT) . All of these indicators are intended to help investors determine the risk-return profile of a mutual fund.ne such consideration is that alpha is used in the analysis of a wide variety of fund and portfolio types. Because the same term can apply to investments of such differing natures, there is a tendency for people to attempt to use alpha values to compare different kinds funds or portfolios with one another.
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).ince the Î±-helix is defined by its hydrogen bonds and backbone conformation, the most detailed experimental evidence for Î±-helical structure comes from atomic-resolution X-ray crystallography such as the example shown at right.