Kappa Organism

Also called  Kappa Particle,   gram-negative symbiotic bacterium found in the cytoplasm of certain strains of the protozoan Paramecium aurelia. These bacteria, when released into the surroundings, change to P particles that secrete a poison (paramecin) that kills other sensitive strains of P. aurelia. The possession of kappa organisms is determined genetically. The kappa bearers, called killers,

Lockwood, Belva Ann

Belva Bennett attended country schools until she was 15 and then taught in them until her marriage in 1848 to Uriah H. McNall, who died in 1853. She then resumed teaching and continued her own education. She graduated from Genesee College

Mahanadi River

River in central India, rising in the hills of southeastern Madhya Pradesh state. Its upper course runs north as an insignificant stream, draining the eastern Chhattisgarh Plain. After receiving the Seonath River, below Baloda Bazar, it turns east and enters Orissa state, its flow augmented by the drainage of hills to the north and south. At Sambalpur the Hirakud Dam on the

Diffraction

The spreading of waves around obstacles. Diffraction takes place with sound; with electromagnetic radiation, such as light, X-rays, and gamma rays; and with very small moving particles such as atoms, neutrons, and electrons, which show wavelike properties. One consequence of diffraction is that sharp shadows are not produced. The phenomenon is the result of interference

Equatorial Guinea

Officially  Republic of Equatorial Guinea,  Spanish  República de Guinea Ecuatorial,   country located on the west coast of Africa. It consists of Río Muni (also called Mbini), on the continent, and five islands: Bioko (formerly Fernando Po), Corisco, Great Elobey (Elobey Grande), Little Elobey (Elobey Chico), and Annobón. A fragmented country, it has a total area of 10,830 square miles (28,051 square kilometres). The capital of the republic is Malabo on Bioko. Bata is the administrative

Trade, Terms Of

Relationship between the prices at which a country sells its exports and the prices paid for its imports. If the prices of a country's exports rise relative to the prices of its imports, one says that its terms of trade have moved in a favourable direction, because, in effect, it now receives more imports for each unit of goods exported. The terms of trade, which depend on

Yamazaki Sokan

Little is known of Sokan's life. According to tradition he served as a retainer to the shogun Ashikaga Yoshihisa and became a monk after Yoshihisa's

Gooch, George Peabody

During a brief political career Gooch specialized in foreign affairs and criticized the policy that led to the South African War. He was a Liberal member of Parliament from 1906 to 1910. Although a dedicated academician, he devoted

Biblical Literature, Collations of the Masoretic materials

The earliest extant attempt at collating the differences between the Ben Asher and Ben Naphtali Masoretic traditions was made by Mishael ben Uzziel in his KitaG Gi-Hulaf (before 1050). A vast amount of Masoretic information, drawn chiefly from Spanish manuscripts, is to be found in the text-critical commentary known as Minhath Shai, by Solomon Jedidiah Norzi, completed in 1626 and

World War I, Eastern Front strategy, 1914

Russian Poland, the westernmost part of the Russian Empire, was a thick tongue of land enclosed to the north by East Prussia, to the west by German Poland (Poznania) and by Silesia, and to the south by Austrian Poland (Galicia). It was thus obviously exposed to a two-pronged invasion by the Central Powers; but the Germans, apart from their grand strategy of crushing France

Pietra Dura

(Italian: “hard stone”), in mosaic, any of several kinds of hard stone used in commesso mosaic work, an art that flourished in Florence particularly in the late 16th and 17th centuries and involved the fashioning of highly illusionistic pictures out of cut-to-shape pieces of coloured stone. The resulting decorative mosaics were used primarily for tabletops and small wall