The Earliest Known Land Flora1
نویسندگان
چکیده
منابع مشابه
Pāṇini grammar is the earliest known computing language
Pāṇini’s fourth (?) century BCE Sanskrit grammar uses rewrite rules guided by an explicit and formal metalanguage. The metalanguage makes extensive use of auxiliary markers, in the form of Sanskrit phonemes, to control grammatical derivations. The method of auxiliary markers was rediscovered by Emil Post in the 1920s and shown capable of representing universal computation. The same potential co...
متن کاملOrigin and radiation of the earliest vascular land plants.
Colonization of the land by plants most likely occurred in a stepwise fashion starting in the Mid-Ordovician. The earliest flora of bryophyte-like plants appears to have been cosmopolitan and dominated the planet, relatively unchanged, for some 30 million years. It is represented by fossilized dispersed cryptospores and fragmentary plant remains. In the Early Silurian, cryptospore abundance and...
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Numerous studies along the northern Mediterranean borderland have documented the use of shellfish by Neanderthals but none of these finds are prior to Marine Isotopic Stage 3 (MIS 3). In this paper we present evidence that gathering and consumption of mollusks can now be traced back to the lowest level of the archaeological sequence at Bajondillo Cave (Málaga, Spain), dated during the MIS 6. Th...
متن کاملMultigene phylogeny of land plants with special reference to bryophytes and the earliest land plants.
A widely held view of land plant relationships places liverworts as the first branch of the land plant tree, whereas some molecular analyses and a cladistic study of morphological characters indicate that hornworts are the earliest land plants. To help resolve this conflict, we used parsimony and likelihood methods to analyze a 6, 095-character data set composed of four genes (chloroplast rbcL ...
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In this review, the factors thought to be important in deter mining the composition of the gut bacterial flora are discussed. In the light ofthese, the effects of various dietary manipulations on the composition and metabolic activity of the gut flora are described. In general, the main effects of diet would be ex pected to be manifested in the right colon, whereas the material available for in...
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ژورنال
عنوان ژورنال: Nature
سال: 1920
ISSN: 0028-0836,1476-4687
DOI: 10.1038/105681a0