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Simulated Epidemic

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Sci Files segment involving students in an experiment to track disease transmission.

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Hi, I'm Kia. 00:00:00
And I'm Justin. 00:00:02
You must be the treehouse detectives. 00:00:03
Yes, we are. 00:00:05
And I'm trying to avoid infectious bacteria. 00:00:06
We need to learn more about how infectious diseases spread. 00:00:09
We can help. 00:00:12
Our mentor from the Society of Women Engineers 00:00:13
helped us with a great experiment that simulates an epidemic. 00:00:15
An epidemic occurs when the majority of people in a group 00:00:18
all get an infectious disease. 00:00:21
How do you simulate an epidemic? 00:00:23
First, our teacher, Ms. Fracker, prepared the test tubes for each student. 00:00:26
All the test tubes had water in them except for one, 00:00:30
which had a solution of ammonia. 00:00:33
But we didn't know which one was which. 00:00:35
Why only one? 00:00:37
To simulate the student who has the cold virus. 00:00:38
What did you do next? 00:00:41
We each used an eyedropper to exchange four drops of fluid 00:00:42
with four other people to simulate an exchange of body fluids, 00:00:45
such as eating or drinking after another person. 00:00:49
We also made sure to record the name of the person we exchanged the fluid with. 00:00:51
Why was that important? 00:00:55
We wanted to see if we could trace the virus back to the original person. 00:00:56
How could you tell who was infected? 00:01:00
After we finished exchanging the fluids, 00:01:02
Ms. Fracker added a hundred drops of an indicator 00:01:05
made from cabbage leaves to our test tubes. 00:01:08
If the test tube was infected, 00:01:11
it changed color to yellow, green, blue, or purple. 00:01:13
Why the different colors? 00:01:16
The color differences were due to the amount of ammonia in each test tube. 00:01:18
The infected test tube turned yellow, 00:01:21
and the ones with the next greatest amount of ammonia turned green. 00:01:23
The ones that were only slightly infected with ammonia turned blue, 00:01:26
and the ones that weren't infected at all turned purple. 00:01:29
I understand. 00:01:32
The test tubes with the most ammonia had the most exposure to the cold virus. 00:01:33
That's correct. 00:01:38
That particular student had exchanged or been exposed to the virus 00:01:39
more than the other students. 00:01:42
How many students were infected at the end of the experiment? 00:01:44
12 out of 15 students were infected. 00:01:46
That's 80% that contracted the cold virus. 00:01:49
It's good to know that not all students were infected. 00:01:52
Yes, it is. 00:01:54
And it's even better to know that you can prevent the spread of disease 00:01:55
by not exchanging body fluids with other people. 00:01:58
To be safe, it's best not to eat or drink after anyone 00:02:01
and to try to avoid contact with sick people. 00:02:04
That's good advice. 00:02:06
Thanks for all your help. 00:02:08
You're welcome. Anytime. 00:02:09
Good luck, Jacob. Hope you stay well. 00:02:11
And thanks to SWE for all their help. 00:02:13
Goodbye from Sigsbee Elementary School in Key West, Florida. 00:02:16
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Idioma/s:
en
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
448
Fecha:
28 de mayo de 2007 - 15:32
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 21″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
14.27 MBytes

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