Planets in a Bottle. Materials:
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1 Planets in a Bottle Space Science News home A SIMPLE LESSON PLAN FOR 2ND - 4TH GRADE CLASSES This is a prototype lesson plan for "Planet in a Bottle" yeast experiments intended for 2nd through 4th grade classrooms. We invite our readers to try the experiments (they are lots of fun) and we welcome comments from educators and others to improve our procedures. Please send comments and suggestions to james.a.phillips@earthlink.net. Objective: The student will measure the viability of yeast samples and to explore environmental conditions which affect the health of yeast microbes. The yeast samples may be common store-bought Baker's yeast, or more exotic forms which have been exposed to extreme environments as part of the Life on the Edge program. Overview: Students mix yeast with a nutrient broth consisting of warm water and table sugar in a plastic water bottle. A common 9 inch party balloon is used to cap the bottle. As yeast digest the sugar they produce carbon dioxide and inflate the balloon. A healthy 1/4 oz sample of baker's yeast can inflate a balloon to 12 inch circumference in less than 30 minutes. Simple variations of this experiment may be used to discover environmental factors that inhibit or promote the health of the yeast colony. Students can compare these factors to conditions on other planets. Materials: 1 cup lukewarm water 3 cubes sugar 1 quarter-oz package of yeast 1 empty half-liter plastic water bottle 1 nine or ten inch party balloon 1 cloth measuring tape 1 small funnel (optional) OPTIONAL: see variations Procedure: Mix water + sugar in water bottle until the cubes are dissolved. Using the funnel add yeast, the gently swirl the mixture. Cap the bottle with a balloon. Use the cloth measuring tape to measure the circumference of the balloon every 15 minutes. This basic recipe can be considered an "Earth in a Bottle." It is a warm, healthy environment for yeast with plenty of nutrients. The total amount of CO 2 in the balloon when it reaches its greatest volume is proportional to the number of healthy yeast microbes present in the initial sample. For the procedure outlined
2 above, the balloon will achieve its maximum volume less than two hours after the yeast are added to the nutrient mix. The rate at which the balloon inflates is proportional to the growth rate of the yeast colony. After the yeast are added to the nutrient broth they begin to divide and increase in number. As the colony size increases so does the rate of CO 2 production, so long as there is an ample supply of nutrients. If the environment inside the bottle is conducive to yeast growth, the maximum rate of CO 2 production will be high. Conversely, if the environment is hostile to yeast, the maximum rate of CO 2 production will be low. Students can begin to explore conditions on other planets with simple variations to the basic recipe. Although we cannot create truly accurate extraterrestrial conditions in a grade school classroom, there are many simple variations that are representative of conditions on other planets. A few examples are listed below: Example variations: Mercury -- Mercury's surface is very hot. Mercury in a Bottle: Boil the water before adding sugar and yeast. Venus -- Venus is very hot, and has an acidic atmosphere. Venus in a Bottle: Instead of water and sugar, use scalding hot orange juice as a nutrient mix. Citric acid in the juice represents sulfuric acid in Venus's hot atmosphere. Lemon juice or vinegar can also be used to increase the acidity of the nutrient mix. Venus's atmosphere also has a high pressure, so that the simulation can be made more realistic by heating the nutrient mix in a pressure cooker. The Moon -- The moon has no atmosphere, so that yeast on its surface would be exposed to a strong vacuum and solar radiation. Moon in a Bottle: Expose the yeast to a vacuum, using a hand pump bell jar, and to radiation in a microwave oven and/or from a UV lamp. Mars -- Mars is cold and has a thin atmosphere which allows much solar UV radiation to penetrate to its surface. Mars in a Bottle: freeze the yeast, then expose the microbes to ultraviolet radiation from a UV lamp before adding yeast to the nutrient mix. Europa -- this moon of Jupiter may harbor the largest ocean in the solar system. The icy surface is a combination of pure water ice, Epsom salts, and unknown minerals. Europa in a Bottle: Freeze a briny mixture of water and Epsom salt. Break the ice into chips and mix the salty ice chips with a cold nutrient solution. Callisto -- this moon of Jupiter may have a salty ocean beneath its frozen crust. Callisto in a Bottle: Add common table salt or Epsom salts to the nutrient mix to simulate a salty environment. Pluto -- Pluto is the most distant planet from the sun and is very cold. Pluto in a Bottle: freeze the yeast in a deep freezer before adding to the nutrient mix. For more information about conditions on other planets, visit Bill Arnett's Nine Planets web site. To learn more about yeast click here.
3 Planets in a Bottle Space Science News home "Life on the Edge" enters the classroom Mar. 16, 1999: NASA/Marshall's "Life on the Edge" program is barely a month old but it's already producing results in some grade school classrooms. "It was wonderful," says Mrs. Nancy Walters, whose 3rd grade class recently tried some simple microbiology experiments with yeast. "The kids felt like they were doing real science, and they couldn't stop talking about it for days." Life on the Edge is an educational program that aims to expose grade school students to some of the basic principles of astrobiology and to explore the possibilities for life elsewhere in the Solar System. The program began just over a month ago when 50 lb of yeast and other microbes were delivered to a summit in California's White Mountains. Conditions there present severe challenges for most forms of life, so it is a good place to test the response of microbes to extreme environments. Some of the microorganisms will remain there for months, and some for longer than a year before they are retreived and distributed to classrooms for experimentation. "Eventually we'll be sending thousands of yeast packets to schools around the country," says Dr. John Horack, director of science communications at the NASA/Marshall Space Sciences Lab. "But even before the microbes are ready to go we have to develop some simple lab protocols that kids can use to measure how their samples were affected by exposure. That's why we're going into classrooms now to test some of our ideas." One of these ideas, called "Planets in a Bottle," was field-tested in a 2nd/3rd grade class room in February. "'Planets in a Bottle' is a simple way to test the viability of yeast samples, and a great way to teach young students about conditions on other planets," explained Dr. Tony Phillips, who is evaluating the concept in classrooms. "The basic ingredients for a planet in a bottle are 1 cup of warm water, 3 sugar cubes, a 1/4 oz. packet of yeast, a half liter plastic water bottle, and a nine inch party balloon. Simply mix the sugar, water, and yeast in the bottle, and cap the bottle with the balloon. A healthy sample of yeast will inflate the balloon to 12 inch circumference in less than an hour." Recent Headlines December 3: Mars Polar Lander nears touchdown December 2: What next, Leonids? November 30: Polar Lander Mission Overview November 30: Learning how to make a clean sweep in space What happens is this: In the nutrient broth -- warm water containing both dissolved oxygen
4 and sugar -- yeast metabolizes the sugar and produces carbon dioxide. The rate of carbon dioxide production at any given instant is proportional to the number of healthy microbes in the bottle. Because the yeast are constantly reproducing through cell division the number of microbes increases exponentially. Likewise, carbon dioxide production increases. The balloon inflates slowly at first, then rapidly accelerates. In practice the balloon inflates to maximum volume in about 45 minutes. That's when the yeast have consumed all the available nutrient. At room temperature the cells remain viable for several hours afterward and then begin to die. The maximum volume of CO 2 and the time required to produce the gas can be used to estimate the number of healthy microbes in the original sample. Click here for a sample "Planets in a Bottle" lesson plan "Two weeks ago we visited Mrs. Walter's 3rd grade classroom in Bishop, CA" continued Dr. Phillips. "The class was divided into seven groups, each with the basic ingredients for a Planet in a Bottle. Rather than have every group do the same experiment, we added variations so that each bottle would represent a different planet. For example, the Moon has no atmosphere to protect its surface from solar UV radiation. So, one group exposed their yeast to a UV lamp before adding the microbes to the nutrient mix, creating a "Moon in a Bottle." Another group used scalding hot orange juice as a nutrient mix for 'Venus in a Bottle.' Citric acid in the orange juice served as a substitute for sulfuric acid in Venus's hot atmosphere." Above: Young scientists monitor yeast growth in a bottle labelled "Pluto". In this case the yeast were frozen for weeks before being added to the nutrient mix. "Clearly we can't reproduce true planetary conditions in a simple water bottle, nor did we pretend to, but these excercises have powerful teaching value. Every kid in Mrs. Walter's class now knows that Venus has acid in its atmosphere thanks to the orange juice experiment, and they also learned that weak acids are not deadly to yeast," Phillips said. "My students were really excited when their balloons began to inflate," recalled Mrs. Walters, "but the best part came at the end when we measured the sizes of the balloons and held a classroom debate about the results. We argued about which planet was most congenial to yeast and what the limitations of our results were. It felt like real science." Left: Students in Mrs. Walter's 3rd grade class debate the question: "Which planet is really best for yeast?" NASA scientists have a crowded schedule of classroom visits planned in the months to come, even though the Life on the Edge yeast container won't be retreived for some time. The goal is to develop safe and effective classroom protocols before the yeast packets are distributed nationally.
5 "We don't want to spoon feed students with overly-detailed protocols," says John Horack," That's not science. But, we do want to give them a good starting point for their own creative experiments with extremophiles. The only way to do that is by spending lots of time in the classroom now, while the microbes are still in the White Mountains." Sign up for our EXPRESS SCIENCE NEWS delivery To view a prototype lesson plan for "Planet in a Bottle" yeast experiments click here. Readers are invited to try the experiments (they are lots of fun) and we welcome comments from educators and others to improve our procedures. Please send comments and suggestions to james.a.phillips@earthlink.net. Life on the Edge is a collaborative educational project being developed between NASA/Marshall Space Science Laboratory, the University of California White Mountain Research Station (WMRS) and the Center for Astrophysical Research in Antarctica (CARA). Participants include David Noever, Richard Hoover, Tony Phillips, John Horack, and Dale Watring of NASA; Dave Trydahl, Joe Szewczak, and Susan Szewczak of the WMRS. Life on the Edge FAQ What is Life on the Edge? Why study life in extreme environments? How do I become involved? The answers to these and many other questions about Life on the Edge may be found on our Frequently Asked Questions web page. We're looking for a few good volunteers Next month we'll be inviting educators, students, and other scientists to join us as participants in Life on the Edge. If you have an interest in learning about life in extreme environments, you'll be able to sign up to receive a sample packet of microbes returned from the White Mountain summit. What's it cost? Nothing! We'll simply ask that you try out some of our classroom-safe lab protocols and give us your feedback. If you're interested please sign up for our Partners in Discovery program. Web Links For more information about conditions on other planets, visit Bill Arnett's Nine Planets web site. To learn more about yeast click here. The White Mountain Research Station - from the University of California The Star Trails Society - join NASA as a partner in Discovery NASA/Ames Astrobiology Web Site -- something for everyone interested in astrobiology Related Stories: Sled dogs carry astrobiology to dizzying heights -- Mar. 11, 1999, Siberian huskies carry a 50 lb container of yeast and other microbes to a 13,000 summit in California's White Mountains.
- NSES-C, NSES-F, NSES-G, NHES-1
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