ALD, Ald or ald may refer to:

Medicine, science and technology

Places

Other uses

Ald is an old Mongolian measure equal to the length between a man's outstretched arms. An ald is therefore approximately equal to 160 cm.

History

In 1818, G. I. Spassky, a Russian scientist specialising in Siberian studies, published in the newspaper "Sibirskii Vestnik", the first report about a stone with oriental inscriptions on it dating back to the early 13th Century. Spassky had found the stone in a factory of Nerchinsk (Eastern Siberia), but the stone was originally discovered in the Kharkhiraa River.

This stone stele is the most ancient monument known with the traditional Mongolian script. The stone is now known as Ghengis stone or the Yesüngge Inscription. The inscription is dedicated to Yesüngge, the son of Genghis Khan's brother Hasar. In 1225, Yesüngge took part in a warriors' competition, hitting the target from a distance of 335 ald (a shooting range in excess of half a kilometre (536 m)).

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ALD-52, also known as 1-acetyl-LSD, is a chemical analogue of lysergic acid diethylamide (LSD). It was originally discovered by Albert Hofmann but was not widely studied until the rise in popularity of psychedelics in the 1960s.

Effects

In Entry 26 of his compendium TiHKAL, which discussed LSD, Shulgin touched briefly on the subject of ALD-52. His writings are vague, second hand accounts, saying doses in the 50-175 µg range have resulted in various conclusions. He found that there was less visual distortion than with LSD and it seemed to produce less anxiety and tenseness and that it was somewhat less potent. Another informant claimed it was more effective in increasing blood pressure. Yet another informant could not tell them apart.

Safety

In The Hallucinogens by Hoffer and Osmond (1967), ALD-52 is listed as having a lower (approximately ¹/₅) intravenous toxicity (in rabbits), a lower (approximately ¹/₈) pyretogenic effect, an equal psychological effect in humans, and double the "antiserotonin" effect as compared with LSD.