You do not have permission to edit this page, for the following reasons:

This IP address has been blocked from editing Wikipedia.
This does not affect your ability to read Wikipedia pages.
Most people who see this message have done nothing wrong. Some kinds of blocks restrict editing from specific service providers or telecom companies in response to recent abuse or vandalism, and can sometimes affect other users who are unrelated to that abuse. Review the information below for assistance if you do not believe that you have done anything wrong.

The IP address or range 54.163.0.0/16 has been blocked (disabled) by ‪Blablubbs‬ for the following reason(s):

The IP address that you are currently using has been blocked because it is believed to be a web host provider or colocation provider. To prevent abuse, web hosts and colocation providers may be blocked from editing Wikipedia.
You will not be able to edit Wikipedia using a web host or colocation provider because it hides your IP address, much like a proxy or VPN.
We recommend that you attempt to use another connection to edit. For example, if you use a proxy or VPN to connect to the internet, turn it off when editing Wikipedia. If you edit using a mobile connection, try using a Wi-Fi connection, and vice versa. If you are using a corporate internet connection, switch to a different Wi-Fi network. If you have a Wikipedia account, please log in.
If you do not have any other way to edit Wikipedia, you will need to request an IP block exemption.

How to appeal if you are confident that your connection does not use a colocation provider's IP address:
If you are confident that you are not using a web host, you may appeal this block by adding the following text on your talk page: ((unblock|reason=Caught by a colocation web host block but this host or IP is not a web host. My IP address is _______. Place any further information here. ~~~~)). You must fill in the blank with your IP address for this block to be investigated. Your IP address can be determined here. Alternatively, if you wish to keep your IP address private you can use the unblock ticket request system. There are several reasons you might be editing using the IP address of a web host or colocation provider (such as if you are using VPN software or a business network); please use this method of appeal only if you think your IP address is in fact not a web host or colocation provider.

Administrators: The IP block exemption user right should only be applied to allow users to edit using web host in exceptional circumstances, and requests should usually be directed to the functionaries team via email. If you intend to give the IPBE user right, a CheckUser needs to take a look at the account. This can be requested most easily at SPI Quick Checkuser Requests. Unblocking an IP or IP range with this template is highly discouraged without at least contacting the blocking administrator.

This block will expire on 17:28, 10 March 2024.

Even when blocked, you will usually still be able to edit your user talk page, as well as email administrators and other editors.

For information on how to proceed, please read the FAQ for blocked users and the guideline on block appeals. The guide to appealing blocks may also be helpful.

Other useful links: Blocking policy · Help:I have been blocked
Your IP address is in a range that has been blocked on all Wikimedia Foundation wikis. The block was made by ‪Jon Kolbert‬. The reason given is Open proxy/Webhost: See the help page if you are affected .
- Start of block: 18:27, 12 November 2023
- Expiry of block: 18:27, 12 November 2028
Your current IP address is 54.163.179.242. The blocked range is 54.163.0.0/16. Please include all above details in any queries you make. If you believe you were blocked by mistake, you can find additional information and instructions in the No open proxies global policy. Otherwise, to discuss the block please post a request for review on Meta-Wiki. You could also send an email to the stewards VRT queue at stewards@wikimedia.org including all above details.

You can view and copy the source of this page:

((Short description|Japanese embryologist and cell biologist))
((citations needed|date=October 2021))
((Infobox person
| name       = Katsuma Dan
| image      = 
| image_size = 
| caption    = 
| birth_date = ((birth date|1904|10|16))
| birth_place = [[Tokyo]]
| death_date = ((death date and age|1996|5|18|1904|10|16))
| death_place = 
| restingplace =
| native_name = 團 勝磨
| native_name_lang = ja
| occupation = embryologist
| yearsactive = 
| spouse = 
| relations = [[Takuma Dan]] (father), [[Inou Dan]] (brother), [[Ikuma Dan]] (nephew)
))
((nihongo|'''Katsuma Dan'''|團 勝磨|Dan Katsuma|October 16, 1904 – May 18, 1996)) was a [[Japanese people|Japanese]] [[embryologist]] and cell [[biologist]]. He was born in 1904 in Tokyo, the youngest son of Baron [[Dan Takuma]], president of the Mitsui Gomei Kaisha Corporation. Takuma Dan was educated in the United States, graduating from MIT in 1878. He was one of the first foreign students to be educated at [[MIT]] and later, as president of the Japan Steel Works, he initiated and maintained close research ties with The Institute.

After receiving his undergraduate degree in Japan, Katsuma Dan also came to the [[United States]] where he studied embryology with Prof. [[L.V. Heilbrunn]]  at the [[University of Pennsylvania]]. In addition Dan worked and studied at the [[Marine Biological Laboratory]] at Woods Hole (MBL) from 1931 to 1934, and later in 1936. It was here that he met his future wife (and longtime scientific collaborator) Jean M. Clark (1910–1978). Clark, who was also a student of Heilbrunn's, studied fertilization in marine invertebrates. The couple raised five children. They also maintained lasting ties to the MBL and returned often in later years as summer researchers and lecturers in embryology.

In March 1932, while Dan was studying at the MBL, his father was assassinated in Japan by ultra-nationalist radicals in the '[[League of Blood Incident]]'. Katsuma Dan returned to [[Japan]] in the late 1930s and worked at the Misaki Marine Biological Station in Morioso Bay. He and his students maintained a remarkable degree of scientific productivity during World War II. His spirit is reflected in a letter written after the war to a friend in the United States: “...ducking under bombs was not so bad. Rather it was a great excitement. Hide and seek at the expense of your life can't help being exciting. There was, however, an awful side to it too.” Near the end of the war the Japanese Navy took over the Misaki Marine Station and converted it into a base for miniature submarines. Although displaced, Dan and his students set up a crude laboratory nearby and continued their work. At the end of the war Dan posted a hand-written note on the door of Misaki, addressed to advancing America forces, in which he said: “... you can destroy the weapons and the war instruments but save the civil equipments [sic] for the Japanese students. When you are through with your job here notify to the university [sic] and let us come back to our scientific home.” The note was signed, “The last one to go.” The obvious humanity and the mention of American marine biological laboratories appealed to a US Naval officer who passed the note on to the MBL. It was later published in ''[[Time Magazine]]'' under the headline, “Appeal to the Goths”.<ref>((cite web|last1=Dan|first1=Katsuma|title=letter two|url=http://legacy.mblwhoilibrary.org/dan/letter_2.html|website=Marine Biological Laboratory ((!)) Woods Hole Oceanographic Institution|accessdate=1 December 2016))</ref>

Dan's scientific work focused on using marine [[invertebrates]] as model organisms to study fundamental questions in [[cell biology]] and [[embryonic development]]. He and his students focused on direct observation of cell behavior using light microscopy and discovered many of the fundamental aspects of [[fertilization]], [[developmental biology|development]], and [[morphogenesis]] (e.g., Dan and Okazaki, 1956). To settle a long-standing debate over the existence of the [[mitotic spindle]], he encouraged his student, [[Shinya Inoué|Shinya Inoue]], to construct polarized light [[microscopes]] and look for evidence of organized [[polymer]] networks in living cells. And, together with [[Daniel Mazia]], he was the first to isolate the mitotic apparatus and subject it to biochemical study. This work demonstrated conclusively the existence of the [[mitotic spindle]] and initiated the modern biochemical study of [[mitosis]].

Dan and his students also developed methods for measuring small, local movements of the cell surface during division. This enabled detailed, quantitative studies of the process of cell cleavage ([[cytokinesis]]). Based on this work, Dan proposed the novel idea that cell cleavage is driven directly by elongation of the [[mitotic spindle]]. That is, the spindle itself attaches to the cell surface via 'astral rays' ([[microtubules]]) and physically draws in the [[cleavage furrow]] (Dan, 1943). Subsequent work indicated that cleavage is actually driven by contraction of an [[actin]] filament network in the cortex rather than by expansion of the spindle but this idea was the forerunner of the current view of [[cytokinesis]], in which interaction of spindle [[microtubules]] with the cell [[Cortex (anatomy)|cortex]] determines the position of the [[cleavage furrow]].

Katsuma Dan was professor of [[zoology]] at the [[Tokyo Metropolitan University]] from 1949-1968. He also served as president of the university from 1964 until his retirement in 1972. Dan was president of both the Zoological Society of [[Japan]] and the Japanese Society of Developmental biologists. In 1976 he received the Second Order Imperial Medal, and in 1987 he received the Emperor's Award for Cultural Merit. A fellowship honoring Katsuma and [[Jean Clark Dan]] was established in 1979 for cultural exchange between the United States and Japan. 
 
Katsuma Dan died in 1996 in [[Osaka]], [[Japan]], at the age of 91.<ref>((cite news|title=Dr. Katsuma Dan, 91, of Japan; Was a Leading Marine Biologist|url=https://www.nytimes.com/1996/05/27/world/dr-katsuma-dan-91-of-japan-was-a-leading-marine-biologist.html|accessdate=November 18, 2015|work=New York Times|date=May 27, 1996))</ref>

==References==
((reflist))

==Sources==
*Obituary, Falmouth Enterprise, May 24, 1996. 
*Schneider, M. (Personal Communication) MBL/WHOI Archives, Woods Hole MA.
*Inoue, S. (1989) Achievements of Professor Katsuma Dan. MBL/WHOI Archives, Woods Hole MA.
*Ewick, D. 2003. Untitled note. Japanisme, Orientalism, Modernism: An archive of Japan in English-language verse.

==External links==
*[https://web.archive.org/web/20060818064703/http://www.mblwhoilibrary.org/archives/dan/index.html Katsuma Dan at MBL]

((authority control))

((DEFAULTSORT:Dan, Katsuma))
[[Category:1904 births]]
[[Category:1996 deaths]]
[[Category:20th-century Japanese zoologists]]

Pages transcluded onto the current version of this page (help):

Katsuma Dan (edit)
Template:Ambox (view source) (template editor protected)
Template:Authority control (view source) (template editor protected)
Template:Birth date (view source) (template editor protected)
Template:Br separated entries (view source) (template editor protected)
Template:Citations needed (view source) (semi-protected)
Template:Cite news (view source) (protected)
Template:Cite web (view source) (protected)
Template:Count (view source) (template editor protected)
Template:Death date and age (view source) (template editor protected)
Template:Find sources mainspace (view source) (template editor protected)
Template:Hlist/styles.css (view source) (protected)
Template:If empty (view source) (protected)
Template:Infobox person (view source) (template editor protected)
Template:MONTHNAME (view source) (template editor protected)
Template:MONTHNUMBER (view source) (template editor protected)
Template:Main other (view source) (protected)
Template:More citations needed (view source) (template editor protected)
Template:Nihongo (view source) (template editor protected)
Template:Pagetype (view source) (protected)
Template:Plainlist/styles.css (view source) (protected)
Template:Pluralize from text (view source) (template editor protected)
Template:Reflist (view source) (protected)
Template:Reflist/styles.css (view source) (protected)
Template:SDcat (view source) (protected)
Template:Short description (view source) (protected)
Template:Short description/lowercasecheck (view source) (protected)
Template:Unbulleted list (view source) (template editor protected)
Template:Wikidata image (view source) (template editor protected)
Module:Age (view source) (template editor protected)
Module:Arguments (view source) (protected)
Module:Authority control (view source) (template editor protected)
Module:Authority control/auxiliary (view source) (template editor protected)
Module:Authority control/config (view source) (template editor protected)
Module:Category handler (view source) (protected)
Module:Category handler/blacklist (view source) (protected)
Module:Category handler/config (view source) (protected)
Module:Category handler/data (view source) (protected)
Module:Category handler/shared (view source) (protected)
Module:Check for clobbered parameters (view source) (template editor protected)
Module:Check for unknown parameters (view source) (protected)
Module:Citation/CS1 (view source) (protected)
Module:Citation/CS1/COinS (view source) (protected)
Module:Citation/CS1/Configuration (view source) (protected)
Module:Citation/CS1/Date validation (view source) (protected)
Module:Citation/CS1/Identifiers (view source) (protected)
Module:Citation/CS1/Utilities (view source) (protected)
Module:Citation/CS1/Whitelist (view source) (protected)
Module:Citation/CS1/styles.css (view source) (protected)
Module:Date (view source) (template editor protected)
Module:Detect singular (view source) (template editor protected)
Module:Disambiguation/templates (view source) (protected)
Module:EditAtWikidata (view source) (protected)
Module:Exponential search (view source) (template editor protected)
Module:Find sources (view source) (template editor protected)
Module:Find sources/config (view source) (template editor protected)
Module:Find sources/links (view source) (template editor protected)
Module:Find sources/templates/Find sources mainspace (view source) (template editor protected)
Module:If empty (view source) (protected)
Module:Infobox (view source) (template editor protected)
Module:Infobox/styles.css (view source) (template editor protected)
Module:InfoboxImage (view source) (template editor protected)
Module:Lang (view source) (template editor protected)
Module:Lang/ISO 639 synonyms (view source) (template editor protected)
Module:Lang/data (view source) (template editor protected)
Module:Language/data/iana languages (view source) (template editor protected)
Module:Language/data/iana regions (view source) (template editor protected)
Module:Language/data/iana scripts (view source) (template editor protected)
Module:Language/data/iana suppressed scripts (view source) (template editor protected)
Module:Language/data/iana variants (view source) (template editor protected)
Module:List (view source) (protected)
Module:Message box (view source) (protected)
Module:Message box/ambox.css (view source) (protected)
Module:Message box/configuration (view source) (protected)
Module:Namespace detect/config (view source) (protected)
Module:Namespace detect/data (view source) (protected)
Module:Navbar (view source) (protected)
Module:Navbar/configuration (view source) (protected)
Module:Navbox (view source) (template editor protected)
Module:Navbox/configuration (view source) (template editor protected)
Module:Navbox/styles.css (view source) (template editor protected)
Module:Nihongo (view source) (template editor protected)
Module:Pagetype (view source) (protected)
Module:Pagetype/config (view source) (protected)
Module:Pagetype/disambiguation (view source) (protected)
Module:Pagetype/setindex (view source) (protected)
Module:Pagetype/softredirect (view source) (protected)
Module:ParameterCount (view source) (template editor protected)
Module:SDcat (view source) (protected)
Module:Separated entries (view source) (protected)
Module:String (view source) (protected)
Module:TableTools (view source) (protected)
Module:Text (view source) (template editor protected)
Module:Unicode data (view source) (template editor protected)
Module:Unicode data/scripts (view source) (template editor protected)
Module:Unsubst (view source) (protected)
Module:Wd (view source) (template editor protected)
Module:Wd/i18n (view source) (template editor protected)
Module:Wikitext Parsing (view source) (template editor protected)
Module:Yesno (view source) (protected)

Return to Katsuma Dan.

Retrieved from "https://en.wikipedia.org/wiki/Katsuma_Dan"