The requirement of many Brucella abortus strains for a PCO2 of approximately 0.03 atmosphere for growth seems to differ both quantitatively and qualitatively from the C02 requirement of other heterotrophic organisms. In some microorganisms, C02 can be replaced by certain tricarboxylic acids (Lwoff and Monod, 1946; Ajl and Werkman, 1948), amino acids (Lyman et al., 1947; Abelson et al., 1952a, b...

Abstract. Homthong M, Kaewpuk W, Yamsuan S, Thongsima A, Mokkapan K, Pikulthong V. 2022. Screening of indole-3-acetic acid PGPB from three agricultural systems at Nakhon Pathom, Thailand. Biodiversitas 23: 5935-5941. Plant growth-promoting bacteria (PGPB) are associated with plant roots and enhance growth via a variety mechanisms, including fixation atmospheric nitrogen, solubilization phosphor...

Azomethane (AM) gas was identified as a major metabolite of 1,2-dimethylhydrazine (1,2-DMH) in the expired air of F344 rats. The compound was characterized by highpressure liquid chromatography, gas chromatography, and mass spectrometry, in comparison to a synthetic standard. At a dose of 21 mg 1,2-DMH/kg sc, approximately 14 and 11% of the dose were exhaled as AM and C02, respectively, in 24 h...

Studies on the influence of light on respiration have yielded different results with different organisms. In some instances results were interpreted as evidence for light stimulation of respiration (3, 4, 5, 6), in other cases for photoinhibition (8, 13), and in still other examples for a negligible effect (1). With a given species simultaneous measurements of respiratory and photosynthetic 02 ...

using C02 laser difference generation in metal-insulator-metal diodes either from the difference between a fixed frequency C02 laser and a tunable waveguide laser, or from the difference between two fixed frequency C02 lasers plus microwave sidebands. is being used to make highly accurate FIR frequency measurements of stable species to serve as frequency and wavelength calibration standards; to...

arise or react. For example, when urea is acted upon by urease in a buffer solution the end products are NH+, C02, and HCO_ and the question presents itself whether C02, or HCO, or H2002 is the primary form of carbonic acid. Similar problems arise in studying the mechanism of decarboxylation of aor ,B-ketonic acids and of the bacterial fission of formic acid into H2 and C02. As Roughton and his...

SuwA, K. and MATSUSHITA, F. Open Loop-Gain of the CO2 Ventilatory Control System. Tohoku J. exp. Med., 1985, 147 (1), 97-106 We devised a method of measuring the open-loop gain for C02-ventilatory feedback control system. The procedure is to gradually increase then decrease the PIco2 while measuring Picoz and PAco2. We theorized that the gain is aPIco2/aPAco2-1. We measured this gain in 11 youn...

The combustion of coal in power plants generates solids (e-g., fly ash, bottom ash) and flue gas (e.g., SOX, C02). New Clean Air Act mandated reduction of SOX emissions from coal burning power plants. As a result, a variety of Clean Coal Technologies (CCT) are implemented to comply with these amendments. However, most of the CCT processes transfer environmentally sensitive elements (e.g., As, C...

Stadtman and Barker (1949) using C14 labeled C02 demonstrated that the methane produced in this fermentation is formed entirely by reduction of C02. Experiments with growing cultures led to the conclusion (Barker, 1939, 1956) that the oxidation of alcohol is dependent upon the supply of carbon dioxide, and that when the carbon dioxide is consumed, no further oxidation of alcohol occurs. This pa...