T H E   N I H    C A T A L Y S T    J A N U A R Y  – F E B R U A R Y   2005


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Also, we welcome "letters to the editor" for publication and your reactions to anything on the Catalyst pages.


In Future Issues...

Rotavirus Vaccine Again a Reality

NIH Tech Transfer

People and Programs in the IRP: A Series


Kids' Catalyst


It’s cold out there! While you’re enjoying your winter, try this experiment to produce some Striped Ice. What you’ll need is:

1. Water

2. Minute timer

3. Two drinking glasses (made of glass, to see the effect better)

4. Patience

5. Liquid food coloring; you’ll need at least one color, but a great combination is red and blue.

6. Experiment sheet with the headings "Time" and "Color"

Now take your glasses and fill them with water. Using the food coloring, make the water in one glass red, and the water in the other blue—make sure the color is dark.

Put both glasses in the freezer, set your timer for an hour, and go play in the snow (or do some homework). You should see ice forming on the top and sides of the glass, usually in some extraordinary patterns. Wait until enough ice has formed that there’s a solid coat of ice on the inside of the glasses.

Chip away at the surface of the ice so you can pour out the water from each color into other, empty glasses. This extra water can be used right away–by pouring red water into the blue-ice glass, and vice versa. Check the time, and come back in another hour. Now you have an alternate stripe!

Experiment with timing, different size and shape of glasses, slanted striping, and colors. (Remember, of course, to write down all of your findings.) Don’t worry if you forget to come back in an hour—water freezes from the outside surface in.

Wonder how it melts, and what color it will turn into when it melts?

Keep warm, and no matter how much ice you have outside, you can make some really nice ice inside!

Jennifer White

The NIH Catalyst is published bi-monthly for and by the intramural scientists at NIH. Address correspondence to Building 2, Room 2E26, NIH, Bethesda, MD 20892. Ph: (301) 402-1449; fax: (301) 402-4303; e-mail: <catalyst@nih.gov>.

Michael Gottesman
Deputy Director for Intramural Research, OD

John I. Gallin
Director, Warren Grant Magnuson Clinical Center,
and Associate Director for Clinical Research

Lance Liotta
Chief, Laboratory of Pathology, NCI


Celia Hooper

Fran Pollner

Shauna Roberts

Dianne Needham
Annie Nguyen
Karen Ross
Jennifer White



Jorge Carrasquillo, CC
David Davies, NIDDK
Dale Graham, CIT
Hynda Kleinman, NIDCR
Elise Kohn, NCI
Susan Leitman, CC
Bernard Moss, NIAID
Michael Rogawski, NINDS
Joan Schwartz, NINDS
Gisela Storz, NICHD


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