Cycling Single-Carbon Compounds: from Omics to Novel Concepts

2013 ◽  
Vol 8 (10) ◽  
pp. 395-400 ◽  
Author(s):  
Ludmila Chistoserdova ◽  
Marina G. Kalyuzhnaya ◽  
Mary E. Lidstrom
Keyword(s):  
Carbon Compounds

A theory of contamination in electron microscopes by surface diffusion

1978 ◽  
Vol 36 (1) ◽  
pp. 116-117
Author(s):  
J.T. Fourie
Keyword(s):  
Electron Beam ◽  
Surface Diffusion ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Physical Parameters ◽  
Carbon Compounds ◽  
Hydrocarbon Molecules ◽  
Electron Microscopes ◽  
Primary Electrons ◽  
Long Chain

Contamination in electron microscopes can be a serious problem in STEM or in situations where a number of high resolution micrographs are required of the same area in TEM. In modern instruments the environment around the specimen can be made free of the hydrocarbon molecules, which are responsible for contamination, by means of either ultra-high vacuum or cryo-pumping techniques. However, these techniques are not effective against hydrocarbon molecules adsorbed on the specimen surface before or during its introduction into the microscope. The present paper is concerned with a theory of how certain physical parameters can influence the surface diffusion of these adsorbed molecules into the electron beam where they are deposited in the form of long chain carbon compounds by interaction with the primary electrons.

A model of superconductivity in alkali-metal-carbon compounds

1992 ◽  
Vol 81 (6) ◽  
pp. 509-512
Author(s):  
S. Koka ◽  
Ashok Chatterjee ◽  
Keshav N. Shrivastava
Keyword(s):  
Alkali Metal ◽  
Carbon Compounds

scholarly journals Unexpected metabolic versatility among type II methanotrophs in the Alphaproteobacteria

2020 ◽  
Vol 401 (12) ◽  
pp. 1469-1477
Author(s):  
Anna Hakobyan ◽  
Werner Liesack
Keyword(s):  
Global Climate Change ◽  
Global Climate ◽  
Type Ii ◽  
Mixotrophic Growth ◽  
Methane Cycle ◽  
Oxidation Activity ◽  
Methane Oxidizing Bacteria ◽  
Metabolic Versatility ◽  
Carbon Compounds ◽  
Growth Requirement

AbstractAerobic methane-oxidizing bacteria, or methanotrophs, play a crucial role in the global methane cycle. Their methane oxidation activity in various environmental settings has a great mitigation effect on global climate change. Alphaproteobacterial methanotrophs were among the first to be taxonomically characterized, nowadays unified in the Methylocystaceae and Beijerinckiaceae families. Originally thought to have an obligate growth requirement for methane and related one-carbon compounds as a source of carbon and energy, it was later shown that various alphaproteobacterial methanotrophs are facultative, able to grow on multi-carbon compounds such as acetate. Most recently, we expanded our knowledge of the metabolic versatility of alphaproteobacterial methanotrophs. We showed that Methylocystis sp. strain SC2 has the capacity for mixotrophic growth on H2 and CH4. This mini-review will summarize the change in perception from the long-held paradigm of obligate methanotrophy to today’s recognition of alphaproteobacterial methanotrophs as having both facultative and mixotrophic capabilities.

Notes- Unsymemetrical Quaternary Carbon Compounds. III. The Preparation and Resolution of Trialkylacetic Acids

1960 ◽  
Vol 25 (5) ◽  
pp. 835-838 ◽  
Author(s):  
Franklin Prout ◽  
Bohdan Burachinsky ◽  
William Brannen, Jr. ◽  
Herbert Young
Keyword(s):  
Quaternary Carbon ◽  
Carbon Compounds
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