Corynebacterium glutamicum ATCC 31831 grew on l-arabinose as the sole carbon source at a specific growth rate that was twice that on d-glucose. The gene cluster responsible for l-arabinose utilization comprised a six-cistron transcriptional unit with a total length of 7.8 kb. Three l-arabinose-catabolizing genes, araA (encoding l-arabinose isomerase), araB (l-ribulokinase), and araD (l-ribulose...

The inorganic carbon source (CO 2 ) availability to the microorganisms has a key role in succinic acid (SA) fermentation process. This study aims investigate behavior of for SA production and underline importance CO effect pressure was investigated its overall impact on Results obtained demonstrated significant yield, productivity fixation rate. Industrial waste, rich maltose, glucose, sucrose,...

Hyperbaric Escape Systems (HES) are used when saturation diving bells have to be evacuated and divers transported to safety. The aim of the present investigation was to determine the levels of metabolic CO2 production expected from the occupants of an HES in different wave states, and from this, to recommend a reasonable and safe requirement for scrubbing CO2 within an HES. The CO2 production a...

Biological nitrogen (N2) fixation is important in controlling biological productivity and carbon flux in the oceans. Unicellular N2-fixing cyanobacteria have only recently been discovered and are widely distributed in tropical and subtropical seas. Metagenomic analysis of flow cytometry-sorted cells shows that unicellular N2-fixing cyanobacteria in "group A" (UCYN-A) lack genes for the oxygen-e...

After the administration of NaHC*03 to the intact animal, labeled carbon has been found in the glycogen of skeletal muscle (1, 2). The explanation of this result may be (a) that all the reactions in the pathway from carbon dioxide to glycogen take place in skeletal muscle itself, as has been found to occur in cardiac muscle (3). On the other hand, it is also possible (5) that the muscle cannot ...

While we now know that N2 fixation is a significant source of new nitrogen (N) in the marine environment, little is known about the fate of this N (and associated C), despite the importance of diazotrophs to global carbon and nutrient cycles. Specifically, does N fixed during N2 fixation fuel autotrophic or heterotrophic growth and thus facilitate carbon (C) export from the euphotic zone, or do...

Phosphorus (P) is the restraining aspect in forest ecosystem, particularly temperate regions, and makes ecosystem more liable to nitrogen (N)-derived acidification. However, it remains poorly understood how N P fertilization together affects soil-P availability other soil properties. To address this question, a factorial experiment was conducted with additions under two ecosystems, i.e., Korean...

BACKGROUND For the production of L-phenylalanine (L-Phe), two molecules of phosphoenolpyruvate (PEP) and one molecule erythrose-4-phosphate (E4P) are necessary. PEP stems from glycolysis whereas E4P is formed in the pentose phosphate pathway (PPP). Glucose, commonly used for L-Phe production with recombinant E. coli, is taken up via the PEP-dependent phosphotransferase system which delivers glu...

The previously reported carbon dioxide fixation reaction by the planar terminal hydroxide complex [Ni(pyN2(Me2))(OH)](1-) in DMF has been further characterized by determination of the equilibrium constants K(eq)²⁹⁸ = 2.4 ± 0.2 × 10(5) M(-1) and K(eq)²²³ = 1.3 ± 0.1 × 10(7) M(-1), as well as the volume of activation for the CO2 binding (ΔV(on)(≠223) = -21 ± 3 cm(3) mol(-1)) and back decarboxylat...