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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

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