Search Results - O'Brian, T R

Precision Spectroscopy in He as a Test of QED by Bergeson, S D, Balakrishnan, A, Baldwin, K G H, Lucatorto, T B, Marangos, J P, McIlrath, T J, O'Brian, T R, Rolston, S L, Sansonetti, C J, Wen, Jesse, Westbrook, N, Cheng, C H, Eyler, E E

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Perception and Homeostatic Control of Iron in the Rhizobia and Related Bacteria by O'Brian, Mark R

“…Iron is an essential nutrient, but it can also be toxic. Therefore, iron homeostasis must be strictly regulated. Transcriptional control of iron-dependent gene…”
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Bradyrhizobium japonicum HmuP is an RNA‐binding protein that positively controls hmuR operon expression by suppression of a negative regulatory RNA element in the 5′ untranslated region by Wu, Peipei, Ong, Alasteir, O'Brian, Mark R.

“…The hmuR operon encodes proteins for the uptake and utilization of heme as a nutritional iron source in Bradyrhizobium japonicum. The hmuR operon is…”
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The divalent metal ion exporter IhpABC is required to maintain iron homeostasis under low to moderate environmental iron conditions in the bacterium Bradyrhizobium japonicum by Zhang, Fengyue, O'Brian, Mark R.

“…Bacterial iron export mitigates high iron stress, but a role for it under lower iron conditions has not been established. MbfA is the high iron stress exporter…”
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The Bradyrhizobium japonicum Ferrous Iron Transporter FeoAB Is Required for Ferric Iron Utilization in Free Living Aerobic Cells and for Symbiosis by Sankari, Siva, O'Brian, Mark R.

“…The bacterium Bradyrhizobium japonicum USDA110 does not synthesize siderophores for iron utilization in aerobic environments, and the mechanism of iron uptake…”
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A Bacterial Iron Exporter for Maintenance of Iron Homeostasis by Sankari, Siva, O'Brian, Mark R.

“…Nutritional iron acquisition by bacteria is well described, but almost nothing is known about bacterial iron export even though it is likely to be an important…”
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Verification of the ponderomotive approximation for the ac Stark shift in Xe Rydberg levels by O'Brian, TR, Kim, J, Lan, G, McIlrath, TJ, Lucatorto, TB

“…We report direct measurements of the ac Stark shifts of Xe Rydberg levels in high-intensity laser fields (up to 6 GW/cm[sup 2]), demonstrating the expected…”
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Manganese is required for oxidative metabolism in unstressed Bradyrhizobium japonicum cells by Hohle, Thomas H., O'Brian, Mark R.

“…Summary Recent studies of Mn2+ transport mutants indicate that manganese is essential for unstressed growth in some bacterial species, but is required…”
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Synthetic Lethality of the bfr and mbfA Genes Reveals a Functional Relationship between Iron Storage and Iron Export in Managing Stress Responses in Bradyrhizobium japonicum by Sankari, Siva, O'Brian, Mark R

“…An mbfA mutant of Bradyrhizobium japonicum defective in iron export is sensitive to short term exposure to high levels iron or H2O2. Here, we found that the…”
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NIST transmission density instrument by Early, Edward A., O'Brian, Thomas R.

“…The Optical Technology Division of NIST has developed a new instrument for measuring ISO standard visual diffuse transmission densities using the diffuse…”
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Electron temperature and density diagnostics in a helium glow discharge by DEN HARTOG, E. A, O'BRIAN, T. R, LAWLER, J.E

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Bradyrhizobium japonicum (diazoefficiens) by Ong, Alasteir, O’Brian, Mark R.

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Transcriptional Control of the Bradyrhizobium japonicum irr Gene Requires Repression by Fur and Antirepression by Irr by Hohle, Thomas H., O'Brian, Mark R.

“…Bradyrhizobium japonicum Fur mediates manganese-responsive transcriptional control of the mntH gene independently of iron, but it also has been implicated in…”
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The mntH gene encodes the major Mn(2+) transporter in Bradyrhizobium japonicum and is regulated by manganese via the Fur protein by Hohle, Thomas H, O'Brian, Mark R

“…The bacterial Nramp family protein MntH is a divalent metal transporter, but mntH mutants have little or no phenotype in organisms where it has been studied…”
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The Bradyrhizobium japonicum fsrB gene is essential for utilization of structurally diverse ferric siderophores to fulfill its nutritional iron requirement by Ong, Alasteir, O'Brian, Mark R.

“…In Bradyrhizobium japonicum, iron uptake from ferric siderophores involves selective outer membrane proteins and non‐selective periplasmic and cytoplasmic…”
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HmuP Is a Coactivator of Irr-Dependent Expression of Heme Utilization Genes in Bradyrhizobium japonicum by Escamilla-Hernandez, Rosalba, O'Brian, Mark R

“…Utilization of heme as an iron source by Bradyrhizobium japonicum involves induction of the outer membrane heme receptor gene hmuR and other genes within the…”
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Interaction between the Bacterial Iron Response Regulator and Ferrochelatase Mediates Genetic Control of Heme Biosynthesis by Qi, Zhenhao, O'Brian, Mark R

“…The heme biosynthetic pathway culminates with the insertion of iron into protoporphyrin catalyzed by ferrochelatase. The Bradyrhizobium japonicum iron response…”
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Rapid evolution of a bacterial iron acquisition system by Chatterjee, Anushila, O'Brian, Mark R.

“…Summary Under iron limitation, bacteria scavenge ferric (Fe3+) iron bound to siderophores or other chelates from the environment to fulfill their nutritional…”
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Magnesium‐dependent processes are targets of bacterial manganese toxicity by Hohle, Thomas H., O'Brian, Mark R.

“…Summary A Bradyrhizobium japonicum mutant defective in the gene encoding the high‐affinity Mn2+ transporter MntH has a severe growth phenotype under manganese…”
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Radiative lifetimes in Si I from laser-induced fluorescence in the visible, ultraviolet, and vacuum ultraviolet by O'BRIAN, T. R, LAWLER, J. E

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