Recent Invited Lectures
1. Yasushi Yokoyama,
gControl of Diastereoselectivity of Reversible Photochemical Electrocyclizationh,
 First International Symposium on Asymmetric Photochemistry, September 2001, Osaka, Japan.

2. Yasushi Yokoyama, 
gRecent Advances of Chiral Photochromism towards Recording and Displayh, 
Symposium "Recent Trends in Photochromic Materials", December 2001, Ikeda, Japan.

3. Yasushi Yokoyama, 
gChirality in Photochromism of Diarylethenesh, 
First International Symposium on Photochromic Diarylethenes, September 2002, Miesbach, Germany.

4. Yasushi Yokoyama,
gPhotochromism Based on 6pi-Electrocyclization: Stereochemistry and Propertiesh, 
Gordon Research Conference Photochemistry, July 2003, Mount Holyoke College, South Hadley, MA, USA.

5. Yasushi Yokoyama, 
g1,3-Bisarylbutadienes: A Novel Photochromic Systemh, 
21st International Conference on Photochemistry (ICP21), July 2003, Nara, Japan.
 
6. Yasushi Yokoyama,
gPhotochromism Based on 6pi-Electrocyclizationh, 
Advanced Course for Basic Principles and Experimental Techniques in Photochemistry, October 2003, Osaka.

7. Yasushi Yokoyama, 
gReversible Control of Properties by Photochromismh, 
The 6th AIST International Symposium on Photoreaction Control and Photofunctional Materials (PCPM2003), October 2003, Tsukuba, Japan.

8. Yasushi Yokoyama, 
gRecent Trends in Organic Photochromismh, 
Kinka Functional Dye Seminar "Functional Dyes in Ashigara", September, Minami-Ashigara, Japan.

9. Yasushi Yokoyama, 
gDevelopment of Photochromic Compounds Applicable to Photofunctional Materialsh, 
KSP New Technology Fair, November, 2004, Kawasaki, Japan.

10. Yasushi Yokoyama, 
gFuture Perspectives of Photon-Mode Rewritable High-Density Optical Recordingh, 
Opto-mechatronics Society, January, 2005, Tokyo, Japan. 

11. Yasushi Yokoyama, 
gPhotochromism based on DNA Matricesh, 
Symposium on Photofunctional Interfaces 2005, May, 2005, Osaka, Japan.

12. Yasushi Yokoyama, 
gOrganic Photochromism and Chiralityh, 
Symposium of Synthetic Organic Chemistry, Japan, June, 2005, Tokyo.

13. Yasushi Yokoyama, 
gControl of Functions by Organic Photochromismh, 
2nd Bio-optics Symposium, October, 2005, Sapporo, Japan.

14. Yasushi Yokoyama, Takuya Arai, Takashi Ubukata, and Yayoi Yokoyama, 
gOptically Active Diarylethenesh, 
2005 Korea-Japan Symposium on Frontier Photoscience (2005 KJFP),
"Photochemistry and Nanotechnology", October, 2005, Pusan, Korea.

15. Yasushi Yokoyama, 
gPhotochromic Switches based on 6pi-electrocyclization Reactionh, 
2005 International Chemical Congress of Pacific Basin Societies (Pacifichem 2005), December 2005, Honolulu, Hawaii, USA.

16. Hitoshi Nagashima, Sujen M. Shrestha, Kensaku Takada, Tetsuya Moriguchi, Nobutaka Eguchi, Yayoi. Yokoyama, Takashi Ubukata, and Yasushi Yokoyama, 
gNovel Photochromic Systems Based on 6pi-Electrocyclizationh,  Japan-France Joint Seminar on Organic Photochromism, October, 2006, Hayama, Japan.

17. Yasushi Yokoyama, 
gBehavior of Photochromic Compounds Incorporated in DNA-Quaternary Ammonium Complexesh, 
3rd Bio-optics Symposium, October 2006, Tokyo.

18. Yasushi Yokoyama, 
gChirality in Photochromismh, 
23rd Symposium, 174th Committee, Japan Society for the Promotion of Science, December, 2007, Tokyo.

19. Yasushi Yokoyama, 
gEfficient Photochromism of Diarylethenes in Polymer Matricesh,  2007 Korea-Japan Symposium on Frontier Photoscience, 
"Photochemistry and Nanotechnology" (2007 KJFP), November 2007, Gyeongju, Korea.

20. Yasushi Yokoyama, 
gDiamantane: A Thread Stitching up Photochromism and Liquid Crystalsh,  Liquid Crystals XII, SPIE Symposium on Photonic Devices and Applications, August 2008, San Diego, California, USA.

21. Yasushi Yokoyama, Tatsuya Shiozawa, Yutaka Tani, Takashi Ubukata, 
gThe Ultimate Diastereoselectivity of Photochromic Diarylethenesh,  The 2008 Korea-Japan Symposium on Frontier Photoscience, September 2008, Jeju, Korea.

22. Yasushi Yokoyama, 
gImprovement of Performances of Photochromic Compounds in Polymer Matricesh, 
4th Bio-optics Symposium, December 2008, Yamaguchi, Japan.

23. Yasushi Yokoyama, 
gHigh Performance Photochromic Systems Based on 6pi-Electrocyclizationh,  International Workshop on Organic Photoswitchable Multifunctional Materials, October 2009, Shanghai, China.

24. Yasushi Yokoyama, 
gNovel and High-performance Photochromic Compounds Based on 6pi-Electrocyclization Reactionsh, 
The 6th Korea-Japan Symposium on Frontier Photoscience, November 2009, Chungnum, Korea.

25. Yasushi Yokoyama,
gUltra-high-performance photochromic systems –High stereoselectivity and high reactivity-h, 
6th Bio-optics Symposium, December 2009, Sapporo, Japan

26. Yasushi Yokoyama, 
gHigh performance photochromic systems based on 6pi-electrocyclizationh,  8th Symposium on Functional Molecules, December 2009, Tsukuba, Japan.

27. Yasushi Yokoyama
gCreation of high performance photochromic compoundsh, 
Evening session gPhotochromism and Mechanical Functionsh, Annual meeting of Chemical Society of Japan, March 2010, Higashiosaka, Japan.

28. Yasushi Yokoyama,
gDevelopment of high performance photochromic compounds – Molecular structure and molecular environment –h, 
5th Molecular Information Dynamics Symposium, March 2010, Osaka, Japan

29. Yasushi Yokoyama,
gHow to accelerate photo- and thermal reactions in polymer matricesh,  Yokohama Key Technology Creative Forum 2010, November 2010, Yokohama, Japan

30. Yasushi Yokoyama, Kaori Morinaka, Hatsune Ogawa, 
gNovel modification of hexatriene-based photochromic compounds for higher performancesh,
7th Bio-optics Symposium, December 2010, Tokyo, Japan.

31. Yasushi Yokoyama,
gStereochemical Control of Photochromic Reactions and Propertiesh,  Russian – French Joint Symposium on Organic Photochromes gPhenics in Russiah, October 2011, Chernogolovka, Russia.

32. Yasushi Yokoyama,
gPerfect Control of Stereochemistry in the Photochromism Based on 6pi-Electrocyclizationh, 
8th Korea-Japan Symposium on Frontier Photoscience, October 2011, Seoul, Korea.

33. Yasushi Yokoyama, Mai Fukagawa,
gChiral photochromism using Human Serum Albumin as the chiral templateh,
8th Bio-optics Symposium, December 2011, Sagamihara, Japan

34. Yasushi Yokoyama,
gOrganic Photochromism – Switching Structures, Properties and Functions by Lighth,
2012 3rd YNU Research Discourse, July 2012, Yokohama, Japan.

35. Yasushi Yokoyama, 
Stereocontrol and function control of photochromism based on hexatriene systemh,
6th Smart Molecular Materials Lecture, October 2012, Sapporo, Japan.

36. Yasushi Yokoyama,
gOn-off switching of fluorescence by photochromismh, 
9th Bio-optics Symposium, December 2012, Yamaguchi, Japan.

37. Yasushi Yokoyama,
gControl of Stereochemistry in Photochromism based on 6pi-Electrocyclizationh
7th International Symposium on Photochromism, September 2013, Berlin, Germany.

38. Yasushi Yokoyama,
gEnantioselective Ring Closure in Photochromism of Diarylethenes in HSAh,
10th Korea-Japan Frontier Photoscience, November 2013, Seoul, Korea.

39. Yasushi Yokoyama, Katsuhiro Watanabe,
gOn-off Switching of fluorescence by photochromismh,
10th Bio-optics Symposium, December 2013, Koganei, Japan.

40. Yasushi Yokoyama,
gProperties and reactivity of photochromic molecules controlled by molecular environmenth,
Special Lectures, gNovel photon-use chemistry developed by molecular
synergeticsh, 94th Annual meeting of Chemical Society of Japan, March 2014, Nagoya, Japan

41. Y. Yokoyama, Y. Hiromoto, K. Takagi, S. Delbaere, K. Ishii, Y. Watanobe, T. Ubukata,
gPhoton-working Precipitation-Dissolution Switch by Photochromismh,
11th Korea-Japan Frontier Photoscience, June 2014, Seoul, Korea.

42. Yasushi Yokoyama,
gPhotochemical control of solution-dissolution of photochromic moleculesh,
11th Bio-optics Symposium, December 2014, Osaka, Japan.

43. Yasushi Yokoyama, 
gChemistry of Organic Photochromism based on 6pi-Electrocyclizationh,
69th Symposium of Kanto Branch, Synthetic Organic Chemistry Japan, May