Podcast
Questions and Answers
What is the term used to describe a group of microorganisms belonging to the same species or sharing a metabolic function?
What is the term used to describe a group of microorganisms belonging to the same species or sharing a metabolic function?
Population
Define the term 'Consortium' in the context of microbial ecology.
Define the term 'Consortium' in the context of microbial ecology.
A group of microbial populations sharing the same habitat and connected by metabolic pathways.
How can an ecosystem be defined in the context of microbial ecology?
How can an ecosystem be defined in the context of microbial ecology?
All microorganisms and their interactions with macroorganisms and the physical environment.
Explain the concept of a rank-abundance curve in a microbial community.
Explain the concept of a rank-abundance curve in a microbial community.
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What happens to cells during the STATIONARY phase in microbial growth?
What happens to cells during the STATIONARY phase in microbial growth?
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When do cells begin to die in a microbial population?
When do cells begin to die in a microbial population?
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How do microorganisms interact in a consortium?
How do microorganisms interact in a consortium?
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Differentiate between an organism and a population in microbial ecology.
Differentiate between an organism and a population in microbial ecology.
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What is the primary difference between a prokaryote and a eukaryote?
What is the primary difference between a prokaryote and a eukaryote?
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How do microorganisms adapt to different sizes in the marine environment?
How do microorganisms adapt to different sizes in the marine environment?
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Study Notes
Environmental Microbiology
- Environmental microbiology is the study of microbial diversity and processes mediated by microorganisms.
- There are three branches of microbiology: environmental microbiology, microbial ecology, and applied microbiology.
Microbial Diversity
- Microorganisms were the only inhabitants of Earth for most of its history.
- They belong to three domains: bacteria, archaea, and eukarya.
Prokaryotes vs Eukaryotes
- Prokaryotes are smaller in size and are included in the picoplankton, while viruses are categorized as femtoplankton.
- Marine microorganisms are small due to the lack of nutrients in seawater and diffusion problems.
- The ratio of surface area to volume changes as the size of the organism increases.
Characteristics of Archaea
- Archaea are similar in size to bacteria (1-10 μm), with marine prokaryotes at the lower limit of this range or even smaller (< 0.3-0.6 μm).
Biofilm Formation
- Biofilms are formed by prokaryotes to obtain and retain nutrients, and to protect themselves from adverse environmental conditions, grazers, and toxic compounds.
- Biofilms have various functions, including:
- Retaining nutrients and humidity
- Protecting from desiccation
- Enhancing extracellular digestion of complex molecules
- Facilitating close association of prokaryotes from different species to form consortia
- Promoting horizontal gene transfer (HGT) in aerobic environments
- Protecting anaerobes from oxygen by a layer of aerobes
- Resisting penetration of antibiotics, biocides, and other toxic compounds
- 40-80% of prokaryotes on Earth live in biofilms, which is the preferred mode of growth everywhere except in the open ocean, where planktonic growth is the norm.
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Description
Explore the field of environmental microbiology, microbial diversity, microbial ecology, and applied microbiology. Learn about the processes mediated by microorganisms and the interactions among different microorganisms.
