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Publications by authors named "Kiyotaka Ohta"

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Direct Methylation of Benzene with Methane Catalyzed by Co/MFI Zeolite.
Koshiro Nakamura Akihito Okuda Kiyotaka Ohta Hitoshi Matsubara Kazu Okumura

ChemCatChem

September 2018

Cobalt-loaded MFI zeolite showed distinct activity for direct methylation of benzene with methane into toluene. High activity was found at around 0.6 of Co/Al molar ratio.

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Changes in regional cerebral blood flow in irradiated regions and normal brain after stereotactic radiosurgery.
Suzuka Taki Kotaro Higashi Manabu Oguchi Hiroyasu Tamamura Shiro Tsuji Kiyotaka Ohta

Ann Nucl Med

June 2002

Objective: To elucidate the radiation effect on the normal brain after stereotactic radiosurgery (SRS), we evaluated the change in regional cerebral blood flow (CBF) in targeted and extra-targeted areas according to the radiation dose given.

Methods: Thirteen patients who underwent SRS for brain tumors or arteriovenous malformations were included in this study. Maximum radiation doses to the lesion ranged from 24 to 37 Gy.

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Synopsis of recent research by authors named "Kiyotaka Ohta"

  • - Kiyotaka Ohta's research spans multiple domains, focusing on catalysis in organic chemistry and the effects of radiation on cerebral blood flow in neurology.
  • - In his 2018 article, he discovered that cobalt-loaded MFI zeolite effectively catalyzes the direct methylation of benzene with methane to produce toluene, with optimal performance at a specific Co/Al molar ratio.
  • - His earlier study in 2002 investigated changes in regional cerebral blood flow in patients after stereotactic radiosurgery, documenting how radiation doses impacted both targeted and normal brain areas.

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