Japan Geoscience Union Meeting 2018

Presentation information

[EE] Poster

B (Biogeosciences) » B-AO Astrobiology & the Origin of Life

[B-AO01] Astrobiology

Tue. May 22, 2018 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Hikaru Yabuta(Hiroshima University, Department of Earth and Planetary Systems Science), Seiji Sugita(Department of Earth and Planetary Science, Graduate School of Science Sciece, The University of Tokyo), Misato Fukagawa(名古屋大学, 共同), Fujishima Kosuke(Tokyo Institute of Technology, Earth-Life Science Institute)

[BAO01-P15] Screening candidates of unicellular organisms in microscopic images using machine learning

*Takashi Sonoke1, Hirohide Demura1, Yoshitaka Yoshimura2, Kyoko Okudaira1 (1.University of Aizu, 2.Tamagawa University)

Keywords:microscopic images, cell, machine learning

Characteristic classification of cells in microscopic images is an important technique in the fields of biotechnology, medical, space etc. In the above technique, it is important to extract only the focused cells from the microscopic image. Examples are the space missions Tanpopo [1] and STARDUST [2]. A large number of images are continuously captured in the depth direction by mechanically setting a constant reference. Manual searching by humans for a target object from a large amount of image group requires much labor. In this study, screening a single microscopic image. Automatic screening of a target object from a group of microscope images is very important in reducing labor.

This study uses the microscopic images of Life Detection Microscope (LDM) [3] as experimental data. The microscopic images of LDM are subjected to fluorescent dyeing treatment. The microscopic image is E.coli with reference to the density of microbes in Atacama Desert [4]. There are sparsely populated cells in the image, thus it is suitable to recognize each cell. Since cells are subjected to fluorescent staining treatment, it is easy to distinguish cells from others.

As a screening approach, machine learning using Convolutional Neural Network (CNN) [5], which is generally considered effective for image recognition, is used.
The CNN in this study is made in order to classify the cell in LDM’s microscopic image. The development language is Python [6], since Python has abundant machine learning frameworks. This study uses TensorFlow [7] as a framework. TensorFlow is a license-free machine learning library provided by Google.
Consequently, CNN was a valid approach in identification of the cell, but it cannot classify the focused cell or not.

[1] Tokyo University of Pharmacy and Life Sciences, ‘TANPOPO Mission’, 2005.[Online]. http://www.ls.toyaku.ac.jp/~lcb-7/tanpopo/ [Accessed: 25-Jan-2018]
[2] NASA, “STARDUST mission”, 1999.[Online] https://stardust.jpl.nasa.gov/home/index.html
[3] A. Yamagishi et al, “LDM (Life Detection Microscope): In situ Imaging of Living Cells on Surface of Mars”, TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN Vol.14 2016 pages Pk_117-Pk_124
[4] Drees et al. Appl. Environ. Microbiol., 2006
[5] Y. LeCun, L. Bottou, Y. Bengio, and P. Haffner.
Gradient-based learning applied to document recognition. Proc. of the IEEE, pages 2278–2324,1998.
[6] Python https://www.python.org/ [Accessed: 25-Jan-2018]
[7] Google, “TensorFlow”,[Online] https://www.tensorflow.org/