By abolishing the large splanchnic uptake of amino acids, evisceration-hepatectomy unmasks the tendency for peripheral tissues to release increased amounts of amino acids into the extracellular fluid during sodium depletion. The increase in amino acid delivery to the liver may stimulate hepatic urea synthesis both by providing more substrates for conversion to urea and perhaps also by stimulation of the activity of urea cycle enzymes.
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Calorimetric measurement of energy and nutrient stimulation of microorganisms from the continental deep subsurface.
Front Microbiol
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Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States.
Microbial activity in the deep continental subsurface is difficult to measure due to low cell densities, low energy fluxes, cryptic elemental cycles and enigmatic metabolisms. Nonetheless, direct access to rare sample sites and sensitive laboratory measurements can be used to better understand the variables that govern microbial life underground. In this study, we sampled fluids from six boreholes at depths ranging from 244 m to 1,478 m below ground at the Sanford Underground Research Facility (SURF), a former goldmine in South Dakota, United States.
View Article and Find Full Text PDFMetabolomic and metagenomic analyses elucidate the role of intercropping in mitigating continuous cropping challenges in tobacco.
Front Plant Sci
December 2024
College of Agronomy and Biotechnology, Southwest University/Engineering Research Center of South Upland Agriculture, Ministry of Education, Chongqing, China.
Introduction: Crop rotation of tobacco with other crops could effectively break the negative impact of continuous tobacco cropping, but the mechanisms of intercropping system effects on tobacco, especially on the rhizosphere, are not clear.
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