BISC209/F13: SpectraMax 190PC instructions

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SpectraMax 190:

Located in the back of lab 302

Molecular Devices SpectraMax 190 and SoftMax Pro6.3™ software instructions

Image: Switch190sm.jpg
View of back of Spectra Max 190

Turn on the Spectra MAX 190 spectrophotometer using the switch located next to the plug in the back on the right hand side (as you face the spec). The drawer will open. The drawer may, or may not, close on its own. If it doesn't close, please press the DRAWER button found on the Spectra MAX control panel (pictured below). It is important to keep the drawer closed as much as possible to prevent dust from entering the spectrophotometer.

Image: Spectramax190.jpg Image: Spectramax190read.jpg
The machine will automatically start a required calibration. Allow up to 10 minutes for the Specta MAX 190 to warm up after the calibration and BEFORE you attempt to insert your plate. The computer should be on. (If not, turn it on.) When the warm up period is over, double click on the SOFTmaxPRO6.3 shortcut on the desktop of the computer. Image: Softmaxpro6.3icon.jpg

This screen will appear:
Image: Pro1.jpg

The draw may open again, or you can open it manually by pushing the DRAWER button ONCE. (Drawer button is found on the Spectramax control panel)

Position your 96 well plate into the tray drawer so that it fits securely in the holder and the well A1 is to the top left. Close it using the DRAWER button .

Image: Pro1a.jpg

Set the wavelength to 590 for the BIOLOG Ecoplate. Check that Plate type is 96 well. Check that the Read area is the whole plate.

Image: Pro2.jpg

Image: Pro3.jpg

Click OK

The spec is ready to read all the wells in a 96 well plate. Click Read.

You will hear the spectrophotometer slit lamp passing over the plate to "read" it, meaning that it is measuring absorbance at the 590 nm wavelength best for detecting purple colored pigments. The purple color formation is a function of the total redox reactions that occurred in the well as the microbes use a carbon source metabolicaly causing the reduction of the colorless form of the dye, 5-cyano-2,3,-ditolyl tetrazolium chloride (CTC), to a purple- colored product.

The drawer will open when the readings are completed. Remove your plate and CLOSE the drawer using the DRAWER button on the face of the spectrophotometer. It is important to keep the drawer closed as much as possible to prevent dust from entering the internal parts of the machine.

A new screen will appear with your recorded data in a 96 well template.

Image: Read1.jpg

The data should be saved automatically in softmax pro, but please also save to our BISC209 folder on the desktop, labeling clearly with your group letter and the date. Because the instrument computer is not networked, you will have to Save the data to a FLASH DRIVE.
Export the labeled data to the thumb drive provided by your lab instructor. If you can export as an excel doc, do so.

Close the Spectromax software. DON'T SAVE! (You have already saved and exported adequately.) Eject the Thumb drive hardware properly. Shut off the SpectraMax spectrophotometer unless you know another group is waiting. Take the Flash drive over to the Instructor’s Mac computer and insert the flashdrive. Process the data. Save the daily data file to a folder for your soil sampling site on the Instructor’s computer desktop AND then EDIT: PASTE SPECIAL: TEXT the data carefully to the Google spreadsheet for your group found in SAKAI. The file is called: BIOLOG-CMD_calc&GraphGroup__2013fa. Each group has its own google doc linked in the navigation bar in SAKAI. Each day that you collect data has a separate page in the google doc. Notice that you will copy and paste one column in the spectrophotometer 96 well format at time into the google spreadsheet. After pasting column 1, 2 and 3 you will begin the next set of replicates (columns 4-6 then 7-9). This is a very important step because it aligns the replicate cells properly.

Image: Read1.jpg Image: Read2.jpg

When you have finished, drag the FLASHDRIVE icon to the TRASH and wait for it to disappear from the desktop. Please store the flash drive in the USB port in the computer on the instructor desk for all BISC209 students. If it is not there, send a message to the class to see if someone took it home by mistake and email your instructor.

PRECAUTION: If you haven’t saved your data and another group reads their plate, your data will be overwritten and lost.

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