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N E W S<br />
R A I S I N G F L O W ERS A N D O B S ERV I N G B EA N S<br />
MSSD Students Contribute to Nation’s<br />
Knowledge of Ozone<br />
By Cathryn Carroll<br />
Students from <strong>the</strong> Model<br />
Secondary School for <strong>the</strong> Deaf<br />
(MSSD) are contributing to<br />
global efforts to study <strong>the</strong><br />
effects of ozone on <strong>the</strong> earth’s<br />
plant life.<br />
As part of <strong>the</strong> Earth System<br />
Science classes, students are<br />
looking at cutleaf coneflowers,<br />
<strong>the</strong> yellow perennials that dot<br />
<strong>the</strong> upper reaches of mountains<br />
in summer, and snap beans, <strong>the</strong><br />
familiar green vegetable<br />
encountered at <strong>the</strong> dinner<br />
t a b l e .<br />
“It turns out that both of<br />
<strong>the</strong>se plants are sensitive to<br />
ozone,” said Mary Ellsworth,<br />
MSSD science teacher whose<br />
classes have participated in<br />
international measures and<br />
experiments since <strong>the</strong> mid<br />
1990s as part of <strong>the</strong> SOAR-<br />
High Project and <strong>the</strong> GLOBE<br />
(Global Learning and<br />
Observations to Benefit <strong>the</strong><br />
Environment) Program.<br />
“Ozone is an interesting<br />
pollutant because it is a<br />
byproduct of cities and<br />
industrial areas, but it doesn’t<br />
stay where it is made. It<br />
collects in a kind of airborne<br />
blanket and travels great<br />
distances. We’ve known for a<br />
long time how ozone irritates<br />
<strong>the</strong> eyes and lungs of city<br />
dwellers. We are just now<br />
learning about <strong>the</strong> considerable<br />
devastation it can have on<br />
plants and farm crops.<br />
“In areas around <strong>the</strong> Great<br />
Smoky mountains, for example,<br />
farmers have learned that<br />
grasses heavily affected by<br />
ozone look normal, but lose<br />
<strong>the</strong>ir nutritional value. They<br />
have had to graze <strong>the</strong>ir animals<br />
in o<strong>the</strong>r fields.”<br />
MSSD students measure<br />
ozone in conjunction with<br />
students around <strong>the</strong> country,<br />
including deaf students from<br />
<strong>the</strong> <strong>University</strong> High School in<br />
Irvine, California, and <strong>the</strong><br />
Indiana School for <strong>the</strong> Deaf.<br />
Last fall <strong>the</strong>y began to study<br />
<strong>the</strong> effects of ozone on<br />
coneflowers in a project<br />
supported by <strong>the</strong> National<br />
Aeronautics and Space<br />
Administration (NASA) and<br />
GLOBE. Led by Susan Sachs<br />
from <strong>the</strong> Great Smoky<br />
Mountains National Park in<br />
North Carolina, <strong>the</strong> project’s<br />
principal investigator is Dr.<br />
Jack Fishman from NASA.<br />
The effect of ozone on snap<br />
beans has come under more<br />
recent study, and MSSD<br />
students are <strong>the</strong> only deaf<br />
students in <strong>the</strong> United States<br />
working on this project. While<br />
<strong>the</strong>y tend <strong>the</strong> plants and<br />
document <strong>the</strong> ozone-related<br />
changes, <strong>the</strong>y will experiment<br />
with and help establish a<br />
protocol for o<strong>the</strong>r students to<br />
use in <strong>the</strong> studies that follow.<br />
The principal investigator is<br />
D r. Irene Ladd from NASA.<br />
While MSSD students help<br />
<strong>the</strong> scientists both with <strong>the</strong>ir<br />
measurements and protocol,<br />
<strong>the</strong>y are also involved in handson<br />
science learning. A few bean<br />
plants were observed last fall,<br />
but <strong>the</strong> coneflowers were<br />
tucked into container- b o u n d<br />
earth outside of MSSD. When<br />
spring comes, <strong>the</strong> bean seeds<br />
are replanted and all <strong>the</strong> plants<br />
begin to grow, students will<br />
take care of <strong>the</strong>m and record<br />
<strong>the</strong>ir observations.<br />
Every day, <strong>the</strong>y will take<br />
ozone readings using a z i k u a,<br />
an instrument named by East<br />
Africans with <strong>the</strong> Swahili word<br />
that means “that which reveals<br />
<strong>the</strong> invisible.” They will<br />
observe and record <strong>the</strong> clouds<br />
and <strong>the</strong> wind direction. Then<br />
<strong>the</strong>y will observe and take<br />
measurements on <strong>the</strong>ir<br />
growing plants.<br />
“For coneflowers, <strong>the</strong><br />
measurements are fairly<br />
straightforward,” noted<br />
Ellsworth. “The leaves grow<br />
two by two directly across <strong>the</strong><br />
stem from each o<strong>the</strong>r.”<br />
Students will measure <strong>the</strong><br />
height, <strong>the</strong> number of leaves,<br />
and <strong>the</strong> tiny purple/brown dots<br />
that appear as ozone damages<br />
<strong>the</strong> coneflower’s cells. These<br />
dots appear on <strong>the</strong> upper<br />
surface of <strong>the</strong> leaves, as <strong>the</strong><br />
stomata on <strong>the</strong> underside take<br />
in gases, including ozone, for<br />
photosyn<strong>the</strong>sis. The older <strong>the</strong><br />
coneflower leaf, <strong>the</strong> larger and<br />
more pervasive its ozonerelated<br />
damage.<br />
Beans, which have a more<br />
complicated growth pattern<br />
than coneflowers, are harder to<br />
systematically observe and<br />
measure. “It’s harder to keep<br />
track of which leaf is which,”<br />
Ellsworth said. MSSD students<br />
will help in establishing <strong>the</strong><br />
scientific protocol of how to<br />
keep track of each leaf.<br />
“The findings of our students<br />
in conjunction with those of<br />
o<strong>the</strong>r students and scientists<br />
may be critical,” Ellsworth<br />
observed. And while our<br />
students work to increase our<br />
understanding, <strong>the</strong>y also learn<br />
science in a most meaningful<br />
w a y. ”<br />
For more information about<br />
<strong>the</strong> project, visit:<br />
h t t p : / / s c i . g a l l a u d e t . e d u / G L O B E /<br />
O z o n e / o z o n e g a rd e n . h t m l.<br />
FA L L / W I N 2 0 0 6 O DY S S E Y 4 9