Secondary amino acid

Secondary amino acids are amino acids which do not contain the amino group -NH2 but is rather a secondary amine. Secondary amino acids can be classified to cyclic acids such as proline and acyclic N-substituted amino acids.

Transidentity

Legal gender

Legal gender is a sex or gender which is recognized under the law. gender identity and sex are used to determine legal gender

Eckert-Greifendorff projection

The Eckert-Greifendorff projection is an equal-area map projection described by Max Eckert-Greifendorff in 1935. Unlike his previous six projections, It is not pseudocylindrical

2020 Osaka Metropolis Plan referendum

A referendum on the implementation of the Osaka Metropolis Plan was held in Osaka on 1 November 2020. In the event of a "yes" vote, the wards in Osaka City would be reorganized into special wards similar to those in Tokyo. The proposal was defeated by a

Bali Strait Bridge

The Bali Strait Bridge (Indonesian: Jembatan Selat Bali, JSB, is a proposed road and railway megaproject between the two Indonesian islands of Java and Bali

Winkel projection

Winkel projection is a group of three projections proposed by German cartographer Oswald Winkel in 1921. Winkel projections use arithmetic mean of the equirectangular projection and other projections. Winkel I projection uses sinusoidal projection

Sambú District

Sambú District is a district (distrito) of Comarca Emberá-Wounaan in Panama. The capital is Puerto Indio. The area of this district is 1296.4 sq. kilometers. It is on the western part of Comarca Emberá-Wounaan. The other side of the Comarca is Cémaco

Comparison matrix

In linear algebra, let A = (aij) be a n × n complex matrix. The comparison matrix M(A) = (αij) of complex matrix A is defined

Metal–inorganic framework

Metal–inorganic frameworks (MIFs) are a class of compounds consisting of metal ions or clusters coordinated to inorganic ligands to form one-, two-, or three-dimensional structures. They are a subclass of coordination polymers, with the special feature

Alkylammonium

In organic chemistry, alkylammonium refers to cations of the formula [R4−nNHn]+, where R = alkyl and 1≤ n ≤ 4. The cations with four alkyl substituents, i.e., [R4N]+, are further classified as quaternary ammonium cations and are discussed more