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Inaccessible Island rail

The Inaccessible Island rail (Laterallus rogersi) is a bird found only on Inaccessible Island in the South Atlantic Tristan archipelago. This rail, the smallest extant flightless bird, was described by physician Percy Lowe in 1923. The adult has brown plumage, a black bill, black feet, and red eyes. It occupies most habitats on the island, from the beaches to the central plateau, feeding on a variety of small invertebrates and some plant matter. Pairs are territorial and monogamous; both parents incubate the eggs and raise the chicks. The rail's adaptations to living on a tiny island at high densities include a low basal metabolic rate, small clutch sizes, and flightlessness. Unlike many other oceanic islands, Inaccessible Island has remained free from introduced predators, allowing this species to flourish while many other flightless rails have gone extinct. The species is nevertheless considered vulnerable, due to the danger of a single catastrophe wiping out the small, isolated population. (Full article...)

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In chemistry, an amino acid is a molecule containing both amine and carboxyl functional groups. In biochemistry, this term refers to alpha-amino acids with the general formula H2NCHRCOOH, where R is an organic substituent.[1] In the alpha amino acids, the amino and carboxylate groups are attached to the same carbon, which is called the α–carbon. The various alpha amino acids differ in which side chain (R group) is attached to their alpha carbon. They can vary in size from just a hydrogen atom in glycine through a methyl group in alanine to a large heterocyclic group in tryptophan.

Beyond the amino acids that are found in all forms of life, many non-natural amino acids have vital roles in technology and industry. For example, the chelating agents EDTA and nitrilotriacetic acid are alpha amino acids that are important in the chemical industry. (more...)

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Pelléas et Mélisande

Pelléas et Mélisande is an opera in five acts with music by the French composer Claude Debussy. The French-language libretto was adapted from Maurice Maeterlinck's symbolist play Pelléas and Mélisande. The plot concerns a love triangle between Prince Golaud, Mélisande (a mysterious young woman he had found lost in a forest), and Golaud's younger half-brother Pelléas. The only opera Debussy ever completed, Pelléas et Mélisande premiered on 30 April 1902 at the Salle Favart in Paris, performed by the Opéra-Comique, with Jean Périer as Pelléas and Mary Garden as Mélisande. The premiere was conducted by André Messager, who was instrumental in getting the Opéra-Comique to stage the work. This poster by the French painter Georges Rochegrosse was produced for the premiere.

Poster credit: Georges Rochegrosse; restored by Adam Cuerden

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  1. ^ Proline is an exception to this general formula. It lacks the NH2 group because of the cyclization of the side chain.