Tag: Winogradsky column
In BIMS, we believe a student “gets it” more quickly when the topics covered in lab are intertwined and connected – not when they follow the disjointed and unrelated approach seen at most colleges and universities. For that reason, we are teaching our Gen Bio I lab through student participation in four major projects. We believe we can give students a good look at the various topics central a first semester freshman biology course through Winogradsky columns (their “pets”), experiments with the fungus Pilobolus, photosynthesis with alginate balls containing the alga Chlorella, and fermentation experiments using the yeast Saccharomyces.
Pilobolus is a fungus that grows on the dung of herbivorous animals. It is sometimes called the “shotgun fungus” or “dung cannon” because of its means for dispersing spores. Its life cycle includes production of spores that shoot out from the fungal colony to land on nearby grasses. When a herbivore eats those grasses, the fungus germinates and grows in the animal waste where it produces more spores to shoot out and start the cycle over again. The key to success for the fungus is a light-sensitive structure that helps aim the spores away from surrounding dung toward an open area where new grass can be found.
The question our students have been asked to determine is whether it is possible to improve the accuracy of the fungus by natural selection. Cultures are grown in a closed container with a hole provided for light to pass through. Our students are placing sterile coverslips over the holes to catch any spores that are accurately shot at the light. Those inaccurate spores hit and stick to the other parts of the container. So each group will create one of these chambers and after two weeks will take photos of the inside of the chamber to document where spores hit (the scatter pattern). Then, the cover slips are removed and used to inoculate new plates of media. The experiment is repeated with new chambers to see if spore accuracy is improved by using spores that were accurate the first time. If the spores hitting the coverslip give rise to fungal colonies with more accurate spores, the scatter pattern for the second test should be much smaller and more concentrated than before.
What are we learning? Phototropism, some mycology, cell biology, cultivation techniques, experimental design, data analysis, and much more. Will this work? We’ll let you know in a few weeks!
The start of the Fall Semester and the 2015-16 school year brings with it a new start in the biology programs at McMurry. New Biomedical Science majors join those from Biology and Life Sciences in taking the new Biology Core – common classes that insure a common experience covering the breadth of biology. This fall, the first new course is being taught – General Biology I – and its follow-up (ingeniously called General Biology II) will follow in the spring.
Lots of schools have a similar two-semester freshman biology sequence. Like many, ours is cells, processes and genetics in the first and multicellular organisms, diversity of life and ecology in the second. However, we hope that the lab for General Biology I will set our program apart from most. The lab, designed by Dr. Benoit, is based on a few “canned” labs interspersed among several multi-week projects covering key concepts and teaching skills central to future biology courses. There will be a project creating and studying Winogradsky columns that will emphasize metabolism and nutrient cycling and ecological succession. Another will use yeast to demonstrate carbon dioxide generation in fermentation and alginate beads to follow its consumption in photosynthesis. A third will require groups of students to design experiments with yeast to study fermentation changes with variations in substrates or environmental conditions. And mitosis and meiosis will be followed using yeast mating experiments. Not exactly an approach taken by most colleges for teaching first semester college students. Our intent is to give them an engaging course unlike anything taken before, one that teaches principles and how science is done and provides experience putting skills learned into action to provide answers to biological questions.
We should be posting stories from this course here and on our Facebook page (https://www.facebook.com/pages/McMurry-Biomedical-Science-Program-BIMS/118598184311) during the semester. Hope you will follow our journey!
1. Nicole McGunegle (middle left, with our Dean Alicia Wyatt and human biology professor Dr. Larry Sharp) became the sixth BIMS majors to complete Honors thesis research this year. Her work was on heat resistance of wild type and genetically-modified spore-forming bacteria. She was one of four Biology Department graduates in December, the others being Kelly Croci, Shayna Hoag, and Collin Valdez. All four are pursuing advanced graduate or professional school programs (Medical School, Physician Assistant school, Optometry School, Nutrition and Dietetics graduate program).
2. There was an official announcement that the Department of Biology was the recipient of a 160-acre tract of land in Callahan County that will serve as a field research station. The donor is Bill Libby, long-time professor of history and religion and the founder of the Cross-Country program at McMurry. The field station will be called Firebase Libby, in recognition of Bill’s time spent as a chaplain with the 101st Airborne in Viet Nam. Every facet of McMurry’s biology and biomedical science programs has identified ways in which this valuable asset can be used for research and student projects. More here: http://blogs.mcm.edu/sncs/?p=1159.
3. On the research front, Dr. Tom Benoit received notification in December of the acceptance of an article written for the Journal of Microbiology and Biology Education. It details the use of diatomaceous earth in construction of Winogradsky columns for study of microbial ecology and mineral cycling in biological systems. Three professors also received good news about funding for research during the Christmas break: Dr. Anna Saghatelyan is partnering with Dr. Hyun-shun Shin of Chemistry on a project to identify new antimicrobials from area plants. They will receive funding from the Sam Taylor Foundation. This work includes the Honors Research of Kara Black, which was presented at the regional ACS conference this fall. More here: http://blogs.mcm.edu/sncs/?p=1150. And Drs. Dana Lee and T.J. Boyle both were notified of their receipt of KIVA grants for next year, funding for research on the genomics of bats and the distribution of crabs in lakes of west Texas.
4. And most exciting has been the resurgence of the Biology Club and Tri-Beta, under the capable leadership of Drs. Boyle and Lee. First came a very successful “Pie a Professor” fundraiser (http://blogs.mcm.edu/sncs/?p=1145) that provided the funding to begin an effort to greatly expand the recycling efforts on campus (http://blogs.mcm.edu/sncs/?p=1155). This is only the beginning of growth and contribution to the campus and community from the Biology and Biomedical Science students at McMurry.
5. Finally, as the year ends we find a new beginning on the horizon for the Department of Biology. Extensive revisions to the BS Biology, BS Biomedical Science, and BS Life Sciences degrees are coming! New courses and a roadmap for the program changes are in the final stages of approval, and incoming students for the Fall 2015 semester will benefit from the tweaks being made. A common biology core of 16 hours, including a junior seminar course to explore careers and prepare for entrance exam tests for graduate and professional programs, will be taken by all students. We expect great things to come from these data-driven improvements!
So, from all of us at McMurry, we hope 2014 was equally productive and gratifying. And we hope all of us will experience an even better 2015!