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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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531 records · Page 30
All sourcesNASA NTRSDOE OSTI
DOE OSTI2024

Aconitic acid exporter (aexA) increases organic acid production in Aspergillus

Recombinant Aspergillus genetically modified to increase expression of g8846, renamed herein as aconitic acid exporter (aexA), are provided, which in some examples are also genetically inactivated for an endogenous cis-aconitic acid decarboxylase (cadA) gene. Such recombinant Aspergillus produce more aconitic acid as compared to native Aspergillus. Also provided are methods of using such recombinant Aspergillus to increase production of aconitic acid and other organic acids, such as citric acid, itaconic acid, and 3-hydroxypropionic acid (3-HP).

Deng, Shuang↗
DOE OSTI2026

Evaluation of Bio-Intermediates and Other Biofuels for use in Marine Engines

This paper presents an overview of the DOE Marine Biofuel Feasibility Study to evaluate the potential of biofuels for ocean-going vessels. These vessels operate on low-cost residual fuel oils (also known as heavy fuel oils or HFO), which require significant heating and purification onboard vessels. The industry is looking at economical alternative fuels that can enhance performance from combustion/emissions, rheology, and other perspectives. Four U.S. national laboratories are collaborating to evaluate a variety of biofuels, including bio-intermediates (pyrolysis and hydrothermal liquefaction oils), biodiesel (fatty acid methyl esters or FAME), bio-residuals (FAME byproducts) for their suitability as fuels for marine diesel engines. Bio-intermediates in particular are of interest because large marine engines that operate on HFO can tolerate lowerquality, more viscous fuels and may be able to utilize these fuels with less upgrading than other applications, presenting economic advantages. The test fuels of interest are examined to determine the minimum level of upgrading required for blend compatibility with market HFOs containing high levels of asphaltenes as well as their impact on the viscosity, polymerization tendency, and combustion properties (particularly cetane number) of the fuel blends in preparation for future evaluation in engine studies.

Kaul, Brian [ORNL] (ORCID:0000000184813620)↗