Bacteria and Fungi Growth Promoted in Moist Environments

Bacteria and Fungi Growth Promoted in Moist Environments -...

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Victor Liou Biology Lab April 08, 2008 Bacteria and Fungi Growth Promoted in Warm, Moist Environments Abstract: Bacteria and Fungi grow in a variety of habitats and can resist some of the most extreme conditions. From common knowledge we understand that a variety of factors affect bacteria and fungi survival and these “include: temperature, moisture, [and] microbial activity” (Sobsey 1987). In this experiment we hoped to give evidential basis for this understanding. After obtaining bacterial samples from a dry cold plastic and moist warm fish tank, we incubated the samples on nutrient agar for two weeks. After comparing our two experimental plates with our control, we see that the warm, moist environment was the only plate with substantial uncontaminated growth that followed the swab lines. This data supports our null hypothesis that bacteria and fungi enjoy thriving in moist, warm environments because the conditions maximize reproductive abilities and maintain cell equilibrium. We disproved our null hypothesis that the environment does not factor into bacterial and fungal growth. Introduction: Bacteria are group of prokaryotic organisms that live in a large variety of habitats and conditions. Although bacteria are most commonly associated with causing sickness, there are millions of bacteria that are not pathogenic, meaning they do not cause disease. These bacteria are essential in degrading organic matter and recycling nutrients into forms that can be consumed by plants and animals (Young). Classifications of bacteria are numerous and include the simple gram positive vs. negative. Gram positive bacteria contain cell walls with thick peptidoglycan while gram negative bacteria have cell walls that have a thin layer of peptidoglycan along with a lipopolysaccharide layer (Freeman 2005). Other classifications involve whether or not bacteria are anerobic, aerobic or photosynthetic in how they generate ATP, or their shapes, cocci, bacilli, or sprillia. 1
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Fungi are eukaryotic, heterotrophic, anaerobic organisms that grow in filaments called hyphae in a network called the mycelium (Freeman 2005). They have essential roles in breaking down organic matter to continue the cycle of nutrients in the ecosystem and supplying nutrients to root systems of plants. Fungi are usually classified by their forms of reproduction i.e. zygospores, ascospores, and basidiospores. The diversity of fungi is what leads to its varying roles in disease, medicine, and food. Common sense says that like humans, bacteria thrive better in warm, moist environments (Dix
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This note was uploaded on 04/29/2008 for the course BIO 110 taught by Professor Stark during the Spring '07 term at Saint Louis.

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Bacteria and Fungi Growth Promoted in Moist Environments -...

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