• Public Gallery  • Help  
• Join Now!  • Log In  • Feature Tour
 Bob Metcalf | Home  
1 - 11 of 11 Total.
Water testing & Pasteurization in Africa
1. Water testing & Pasteurization in Africa 
A guide to water testing in developing countries using a Portable Microbiology Laboratory, and how to pasteurize contaminated water using sunshine and a simple solar cooker.
5362 Visits
131 Images
Shared Album
2. SODISheatchlorine  (July 18, 2011)
Water sources in Lower Nyakach, Kenya, are tested and treated by solar disinfection (SODIS), heat, and chlorine. Will these procedures make the water safe to drink?
410 Visits
83 Images
Shared Album
Solar water pasteurization
3. Solar water pasteurization  (May, 2015)
The default recommendation to treat contaminated water is to boil it. However, as microbiologists know from milk pasteurization (160°F, 71°C, for only 15 seconds)boiling is heat far in excess of what is needed. Water will be pasteurized when heated to 149°F (65°C). A reusable, wax-based Water Pasteurization Indicator (WAPI) can verify that water has been pasteurized. Microbiology tests before and after heating verify the disease microbes have been killed.
95 Visits
21 Images
Shared Album
4. watermicrohistory  (1987-2003)
History of water testing in developing countries using the Colilert 10 ml presence/absence test and the E. coli Count Petrifilm as test items of a Portable Microbiology Laboratory.
793 Visits
110 Images
Shared Album
Water testing in Kenya, Rwanda, 2012
5. Water testing in Kenya, Rwanda, 2012  (July, 2012)
With the Friends of the Old (FOTO) staff in Lower Nyakach, Kenya, 51 local drinking water sources were tested using the Colilert and Petrifilm tests. Next day results indicated the high level of contamination of almost all sources. In Rwanda, Professor Metcalf led a water testing workshop for UN-Habitat for environmental health staff.
30 Visits
22 Images
Shared Album
How to make a Cookit solar cooker
6. How to make a Cookit solar cooker  (June, 2015)
It's easy to make a Cookit solar cooker from cardboard and 12 feet of aluminum foil. I've included the details of all steps that I use when leading workshops where many Cookits are made. To solar cook, place dark covered pot inside a clear plastic roasting bag. Solar water pasteurization doesn't require a clear plastic bag. Click on the 'start slideshow' above the first photo to view a slideshow.
32 Visits
38 Images
Shared Album
Delft, Holland, 30 July, 2012
7. Delft, Holland, 30 July, 2012  (30 July, 2012)
A stopover in Delft between Kenya and California, with a visit to the tomb of Antonie van Leeuwenhoek, citizen of Delft, who made a microscope in the 1670s that was powerful enough to discover the microbial world for all of humanity. He was the first person to see bacteria, yeast, algae, red blood cells, protozoa.
574 Visits
67 Images
Shared Album
Bio 139 Lab Practical #1
8. Bio 139 Lab Practical #1 
Photos from lab exercises covered on the first lab practical exam
3630 Visits
83 Images
Shared Album
Bio 139 Lab Practical 2
9. Bio 139 Lab Practical 2 
Photos from lab exercises covered on the second lab practical exam
13979 Visits
85 Images
Shared Album
WAPI waxes
10. WAPI waxes  (March 6, 2011)
Testing melting temperature of WAPI waxes
395 Visits
19 Images
Shared Album
Jacks 2015 Reunion
11. Jacks 2015 Reunion  (June 12-14, 2015)
Eight Jacks and four spouses enjoyed getting together at Earlham College, June 12-14, 2015
194 Visits
36 Images
Shared Album

Share images with friends & family, Send Invitation or Share URL: