Transition metal carbene complexA transition metal carbene complex is an organometallic compound featuring a divalent organic ligand. The divalent organic ligand coordinated to the metal center is called a carbene. Carbene complexes for almost all transition metals have been reported. Many methods for synthesizing them and reactions utilizing them have been reported. The term carbene ligand is a formalism since many are not derived from carbenes and almost none exhibit the reactivity characteristic of carbenes.
Data storageData storage is the recording (storing) of information (data) in a storage medium. Handwriting, phonographic recording, magnetic tape, and optical discs are all examples of storage media. Biological molecules such as RNA and DNA are considered by some as data storage. Recording may be accomplished with virtually any form of energy. Electronic data storage requires electrical power to store and retrieve data. Data storage in a digital, machine-readable medium is sometimes called digital data.
Science in the RenaissanceDuring the Renaissance, great advances occurred in geography, astronomy, chemistry, physics, mathematics, manufacturing, anatomy and engineering. The collection of ancient scientific texts began in earnest at the start of the 15th century and continued up to the Fall of Constantinople in 1453, and the invention of printing allowed a faster propagation of new ideas. Nevertheless, some have seen the Renaissance, at least in its initial period, as one of scientific backwardness.
PlateresquePlateresque, meaning "in the manner of a silversmith" (plata being silver in Spanish), was an artistic movement, especially architectural, developed in Spain and its territories, which appeared between the late Gothic and early Renaissance in the late 15th century, and spread over the next two centuries. It is a modification of Gothic spatial concepts and an eclectic blend of Mudéjar, Flamboyant Gothic and Lombard decorative components, as well as Renaissance elements of Tuscan origin.
NahdaThe Nahda (النهضة, meaning "the Awakening"), also referred to as the Arab Awakening or Enlightenment, was a cultural movement that flourished in Arab-populated regions of the Ottoman Empire, notably in Egypt, Lebanon, Syria, and Tunisia, during the second half of the 19th century and the early 20th century. In traditional scholarship, the Nahda is seen as connected to the cultural shock brought on by Napoleon's invasion of Egypt in 1798, and the reformist drive of subsequent rulers such as Muhammad Ali of Egypt.
