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Mass extinctions are characterized by the loss of at least 75% of species within a geologically short period of time (i.e., less than 2 million years). [18] [51] The Holocene extinction is also known as the "sixth extinction", as it is possibly the sixth mass extinction event, after the Ordovician–Silurian extinction events, the Late Devonian extinction, the Permian–Triassic extinction ...
Gray goo (also spelled as grey goo) is a hypothetical global catastrophic scenario involving molecular nanotechnology in which out-of-control self-replicating machines consume all biomass (and perhaps also everything else) on Earth while building many more of themselves, [1] [2] a scenario that has been called ecophagy (literally: "consumption of the environment"). [3]
The book also applies this theme to a number of other habitats and organisms throughout the world. After researching the current mainstream view of the relevant peer-reviewed science, Kolbert estimates flora and fauna loss by the end of the 21st century to be between 20 and 50 percent "of all living species on earth".
In general, phototrophic organisms in the biofilm provide a foundation for the growth of the community as a whole by mediating biofilm processes and conversions. The chemoheterotrophs use the photosynthetic waste products from the phototrophs as their carbon and nitrogen sources, and in turn perform nutrient regeneration for the community.
Biofilm growth is associated with an escalated level of mutations and horizontal gene transfer which is promoted in due to the packed and dense structure. Bacteria in biofilms communicate by quorum sensing, which activates genes participating in virulence factors production. [25] [26] Biofilms are the product of a microbial developmental ...
There he and his team did research on biofilms involved in periodontal disease. In 2008 he became the director of biofilm research at Pittsburgh's Allegheny-Singer Research Institute (ASRI) and retained this directorship until his death in 2012. [3] He was the author or co-author of over 700 scientific publications. [1]
As the world’s largest cryptocurrency, bitcoin has been volatile as of late — yet its growth remains remarkable. Its price has surged 37% in 2024 and 94% over the last 12 months when measured ...
In contrast, in classic game theory, even complex games are treated as single, monolithic objects. This makes the analysis of games hard to scale. Compositional game theory (CGT) aims to apply the modularity principle to game theory. The main motivation is to make it easier to analyze large games using software tools.