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Alpha particles, also called alpha rays or alpha radiation, consist of two protons and two neutrons bound together into a particle identical to a helium-4 nucleus. [5] They are generally produced in the process of alpha decay but may also be produced in other ways. Alpha particles are named after the first letter in the Greek alphabet, α.
An alpha solenoid (sometimes also known as an alpha horseshoe or as stacked pairs of alpha helices, abbreviated SPAH) is a protein fold composed of repeating alpha helix subunits, commonly helix-turn-helix motifs, arranged in antiparallel fashion to form a superhelix. [2] Alpha solenoids are known for their flexibility and plasticity. [3]
The Alpha Kappa Rho International Fraternity and Sorority ( ακρ or AKRHO) is a fraternity established in the Philippines in 1973. [1] The fraternity, comprising men and women from different universities, was originally established to promote loyalty, unity and integrity in the fraternity amongst its members.
Alpha waves, or the alpha rhythm, are neural oscillations in the frequency range of 8–12 Hz [1] likely originating from the synchronous and coherent ( in phase or constructive) electrical activity of thalamic pacemaker cells in humans. Historically, they are also called "Berger's waves" after Hans Berger, who first described them when he ...
AGRA, formerly known as the Alliance for Green Revolution in Africa is an African-led African-based organization that seeks to catalyse Agriculture Transformation in Africa. AGRA is focused on putting smallholder farmers at the centre of the continent's growing economy by transforming agriculture from a solitary struggle to survive into farming ...
Alpha Kappa Alpha Sorority, Inc. ( ΑΚΑ) is the first intercollegiate historically African American sorority. [3] The sorority was founded on January 15, 1908, at the historically black Howard University in Washington, D.C., by a group of sixteen students led by Ethel Hedgemon Lyle. Forming a sorority broke barriers for African American women ...
Box office. $99.6 million [5] Alpha is a 2018 American prehistorical adventure film directed by Albert Hughes and written by Daniele Sebastian Wiedenhaupt, from a story by Hughes. The film stars Kodi Smit-McPhee as a young hunter who encounters and befriends an injured wolf during the last ice age, with Jóhannes Haukur Jóhannesson as his ...