Results 31 to 40 of about 77,666 (195)
Classification of scale-free networks [PDF]
Proc. Natl. Acad. Sci. USA 99, 12583 (2002), 2002 While the emergence of a power law degree distribution in complex networks is intriguing, the degree exponent is not universal. Here we show that the betweenness centrality displays a power-law distribution with an exponent \eta which is robust and use it to classify the scale-free networks. We have observed two universality classes with \eta \approx 2.
arxiv +1 more source
MicrobiologyOpen, 2019 The role of cyclic nucleotides as second messengers for intracellular signal transduction has been well described in bacteria. One recently discovered bacterial second messenger is cyclic di‐adenylate monophosphate (c‐di‐AMP), which has been demonstrated
Frank Braun +6 more
doaj +1 more source
Lipidomic chemotaxonomy aligned with phylogeny of Halobacteria
Frontiers in Microbiology, 2023 Archaea play an important role in global biogeochemical cycles and are considered ancestral to eukaryotes. The unique lipid composition of archaea, characterized by isoprenoid alkyl chains and ether linkage to glycerol-1-phosphate, offers valuable ...
Wenyong Yao +11 more
doaj +1 more source
Frontiers in Microbiology, 2020 The thermophilic archaeon Sulfolobus acidocaldarius can use different carbon sources for growth, including the pentoses D-xylose and L-arabinose. In this study, we identified the activator XylR (saci_2116) responsible for the transcriptional regulation ...
Nienke van der Kolk +7 more
doaj +1 more source
Frontiers in Microbiology, 2023 Haloferax volcanii and other Haloarchaea can be pleomorphic, adopting different shapes, which vary with growth stages. Several studies have shown that H.
Megha Patro +4 more
doaj +1 more source
"Probing the limits of extremophilic life in extraterrestrial environment-simulated experiments" [PDF]
, 2012 The results obtained in these experiments have revealed a remarkable resistance of extremophilic bacteria and archaea against different radiation sources (VUV, solar wind simulants, X rays) whenever protected by microsized carbonaceus grains. Altogether, the collected data suggest the interesting possibility of the existence of microbial life beyond ...
arxiv +1 more source
Electron cryo-microscopy reveals the structure of the archaeal thread filament
Nature Communications, 2022 Pili are filamentous appendages on the surface of bacteria and archaea, and play roles in multiple processes such as adhesion, motility and horizontal gene transfer. Here, Gaines et al. describe the structure of a new type of pilus, termed ‘thread’, from
Matthew C. Gaines +10 more
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Length, Protein-Protein Interactions, and Complexity [PDF]
, 2004 The evolutionary reason for the increase in gene length from archaea to prokaryotes to eukaryotes observed in large scale genome sequencing efforts has been unclear. We propose here that the increasing complexity of protein-protein interactions has driven the selection of longer proteins, as longer proteins are more able to distinguish among a larger ...
arxiv +1 more source
Physical Model of the Immune Response of Bacteria Against Bacteriophage Through the Adaptive CRISPR-Cas Immune System [PDF]
Phys. Biol. 10 (2013) 025004, 2014 Bacteria and archaea have evolved an adaptive, heritable immune system that recognizes and protects against viruses or plasmids. This system, known as the CRISPR-Cas system, allows the host to recognize and incorporate short foreign DNA or RNA sequences, called `spacers' into its CRISPR system.
arxiv +1 more source
Frontiers in Microbiology, 2019 Climate change is causing arctic regions to warm disproportionally faster than those at lower latitudes, leading to alterations in carbon and nitrogen cycling, and potentially higher greenhouse gas emissions.
Ricardo J. Eloy Alves +9 more
doaj +1 more source