The experiment of blood types
Now
adays in Japan, most people know their own blood type. But until the beginning of the 20th century, blood type didn't exist. At that time, a blood transfusion was left up to chance. Some people were saved by a blood transfusion and other people were killed by a blood transfusion.
How it happened. The unpredictable quality of this procedure changed when Karl Landsteiner experimented about this problem.
He focused on blood aggregation. First, he separated the blood into the blood cell and plasma. He mixed one’s person's blood cell and with another’s plasma. He observed the reaction on various combinations. There were combinations aggregating or not aggregating.
He discovered it had a regularity. Based on this results, he distinguished the main blood types.
After that, it was found from Karl Landsteiner’s experiment that the main reason of blood transfusion accident was blood type incompatibility. Blood transfusion accidents decreased sharply. This experiment contributed to the development of medicine.
Comments:
1. "Nowadays" instead of "now"; this could just be my personal preference, but "nowadays" more closely means "these days" and "now" has more of a connotation of "at this very moment".
2. Did you mean to ask "How did it happen?" I changed the question to the opening of a new sentence and attached it to the next sentence. Is this what you meant to say?
3. When you say "he mixed one's blood cell", do you mean of a specific person? Or a specific type of blood cell? As in "he mixed one (type of) blood cell.
4. The verb "to mix" uses the subordinate conjunction "with" or the conjunction "and". For me, "with" sounds better in this sentence, but it's up to you.
Final rewrite:
Nowadays in Japan, most people know their own blood type. But until the beginning of the 20th century, blood type didn't exist. At that time, a blood transfusion was left up to chance. Some people were saved by a blood transfusion and other people were killed by a blood transfusion. The unpredictable quality of this procedure changed when Karl Landsteiner experimented about this problem.
He focused on blood aggregation. First, he separated the blood into the blood cell and plasma. He mixed one person's blood cell with another’s plasma. He observed the reaction on various combinations. There were combinations aggregating or not aggregating.
He discovered it had a regularity. Based on this results, he distinguished the main blood types.
After that, it was found from Karl Landsteiner’s experiment that the main reason of blood transfusion accident was blood type incompatibility. Blood transfusion accidents decreased sharply. This experiment contributed to the development of medicine.
Well done!
