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The first documented European contact with the Philippines was made in 1521 by Ferdinand Magellan in his circumnavigation expedition, [1] during which he was killed in the Battle of Mactan. Forty-four years later, a Spanish expedition led by Miguel López de Legazpi left modern Mexico and began the Spanish conquest of the Philippines in the ...
A condition called the zinc shakes or "zinc chills" can be induced by inhalation of zinc fumes while brazing or welding galvanized materials. [149] Zinc is a common ingredient of denture cream which may contain between 17 and 38 mg of zinc per gram. Disability and even deaths from excessive use of these products have been claimed.
The two discovered a new element in a molybdenum sample that was used in a cyclotron, the first element to be discovered by synthesis. It had been predicted by Mendeleev in 1871 as eka-manganese. [171] [172] [173] In 1952, Paul W. Merrill found its spectral lines in S-type red giants. [174]
The first official census in the Philippines was carried out in 1878. The colony's population as of December 31, 1877, was recorded at 5,567,685 persons. [294] This was followed by the 1887 census that yielded a count of 6,984,727, [295] while that of 1898 yielded 7,832,719 inhabitants. [296]
The oldest known pills were made of the zinc carbonates hydrozincite (described 1853) and smithsonite (described 1832). Calamine is a historic name for an ore of zinc (hemimorphite (IMA1962 s.p.) and smithsonite). [6] De architectura (about 15 BC) of Marcus Vitruvius Pollio, Libri X, vol. VII, Caput 8.
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Polities founded in the Philippines from the 10th–16th centuries include Maynila, [17] Tondo, Namayan, Pangasinan, Cebu, Butuan, Maguindanao, Buayan, Lanao, Sulu, and Ma-i. [18] Among the nobility were leaders called datus, responsible for ruling autonomous groups called barangay or dulohan. [7]
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