Month: May 2013

TJIO Joe Hin (1919-2001): Penemu Jumlah Kromosom

TJIO Joe Hin lahir di Jawa (pada jaman penjajahan Belanda), dan lulus dari Sekolah Agronomi Bogor pada tahun 1940. Ia kemudian dikenal sebagai ahli cytogenetik yang pertama kali menghitung dengan tepat jumlah kromosom manusia. Peristiwa penting itu terjadi pada akhir tahun 1955, ketika Tjio bekerja sebagai peneliti tamu di Institute of Genetics, University of Lund, Swedia. (Thanks to Galih Prasetya for telling me about him!) Kisah tentang TJIO Joe Hin selengkapnya dapat dibaca di:

http://www.nytimes.com/2001/12/07/us/joe-hin-tjio-82-research-biologist-counted-chromosomes.html

Berikut adalah cuplikan dari artikel tersebut (maaf, dalam bahasa Inggris):

Joe Hin Tjio, 82; Research Biologist Counted Chromosomes

By WOLFGANG SAXON

Dr. Joe Hin Tjio, the research biologist who produced the first correct count of the chromosomes in human cells, died Nov. 27 in Gaithersburg, Md. He was 82.

Dr. Tjio (pronounced CHEE-oh) accomplished that feat in 1956 as a visiting scientist at the University of Lund, Sweden. His surprise discovery helped pave the way to much work in human biology pertaining to chromosomal abnormalities.

He later joined the staff of the National Institutes of Health, and President John F. Kennedy honored him with an outstanding achievement award in 1962.

The nature and functions of chromosomes, the agents of heredity, had been known when Dr. Tjio correctly counted the number of chromosomes. But observing human chromosomes under the microscope had always been more difficult than observing those of other species, and scientists had long assumed that chromosomes normally numbered 48 in each body cell.

Dr. Tjio used an advanced technique to separate chromosomes of embryonic lung tissue on glass slides and, to his own amazement, saw that the actual figure was 46. ”The number was just an incidental finding,” he recalled many years later.

Catatan: Artikel serupa dapat pula ditemukan di situs The Guardian.

HG, 03-05-2013