2025年3月7日 · bacteria, any of a group of microscopic single-celled organisms that live in enormous numbers in almost every environment on Earth, from deep-sea vents to deep below Earth’s surface to the digestive tracts of humans.. Bacteria lack a membrane-bound nucleus and other internal structures and are therefore ranked among the unicellular life-forms called …

History. Asturias was an independent Christian kingdom between 718 and 910, formed by Visigothic nobles and officials who had been displaced by the Muslim invasion of Spain. The Visigoths elected Pelayo as king and set up a capital at Cangas de Onís. The kingdom extended its frontiers to include Galicia to the southwest and Cantabria to the east before the end of the …

2025年2月14日 · Two kinds of nitrogen-fixing bacteria are recognized. The first kind, the free-living (nonsymbiotic) bacteria, includes the cyanobacteria (or blue-green algae) Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium.The second kind comprises the mutualistic (symbiotic) bacteria; examples include Rhizobium, associated with leguminous …

On the calendar. The term Ides derives from the Latin word iduare (“to divide”), with the full moon serving as the division point in the middle of each month. In the ancient Roman calendar, months were divided according to the lunar cycle into three groups of days. The Ides corresponded with the rise of the full moon in the middle of the month. Depending on the length of the month, the ...

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Pelayo’s historical personality is overshadowed by his legend.As far as can be ascertained, he was a page, or possibly a member of the royal bodyguard, of the Visigothic king Roderick, and he may have been of royal blood.He survived the defeat (711) of the Visigoths by the Moors at the Battle of Guadalete near Medina Sidonia and reached his native Asturias, where he led a …

2025年1月30日 · prokaryote, any organism that lacks a distinct nucleus and other organelles due to the absence of internal membranes. Bacteria are among the best-known prokaryotic organisms. The lack of internal membranes in prokaryotes distinguishes them from eukaryotes.The prokaryotic cell membrane is made up of phospholipids and constitutes the …

Miguel Ángel Asturias (born October 19, 1899, Guatemala City, Guatemala—died June 9, 1974, Madrid, Spain) was a Guatemalan poet, novelist, and diplomat, winner of the Nobel Prize for Literature in 1967 and the Soviet Union’s Lenin Peace Prize in 1966. His writings, which combine the mysticism of the Maya with an epic impulse toward social protest, are seen as summing up …

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Asturias, solo piano piece written in the early 1890s by Catalan composer and pianist Isaac Albéniz, using rolled chords that effectively evoke the strumming of a guitar.In fact, the version usually played is a transcription of the original piano piece for guitar. Despite being called Asturias—which is the name of a northern region of Spain—the piece powerfully evokes the …