Kyoto University

About: Kyoto University is a education organization based out in Kyoto, Japan. It is known for research contribution in the topics: Population & Catalysis. The organization has 85837 authors who have published 217215 publications receiving 6526826 citations. The organization is also known as: Kyōto University & Kyōto daigaku.

Active motion of a Janus particle by self-thermophoresis in a defocused laser beam

Abstract: We study self-propulsion of a half-metal coated colloidal particle under laser irradiation. The motion is caused by self-thermophoresis: i.e., absorption of a laser at the metal-coated side of the particle creates local temperature gradient which in turn drives the particle by thermophoresis. To clarify the mechanism, temperature distribution and a thermal slip flow field around a microscale Janus particle are measured for the first time. With measured temperature drop across the particle, the speed of self-propulsion is corroborated with the prediction based on accessible parameters. As an application for driving a micromachine, a microrotor is demonstrated.

Crucial role of FOXP3 in the development and function of human CD25+CD4+ regulatory T cells

Abstract: Naturally occurring CD25 1 CD4 1 regulatory T cells are engaged in the maintenance of immunological self-tolerance and down-regulation of various immune responses. Recent studies with mice showed that Foxp3, which encodes the transcription factor Scurfin, is a master regulatory gene for the development and function of CD25 1 CD4 1 regulatory T cells. Here we examined the role of FOXP3 in human CD25 1 CD4 1 regulatory T cells. The FOXP3 gene and its protein product were preferentially expressed in peripheral CD25 1 CD4 1 T cells, in particular CD25 1 CD45RO 1 CD4 1 T cells in normal individuals and, interestingly, in some human T cell leukemia virus type 1-infected T cell lines, which