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Related Concept Videos

Factors Influencing Microbial Growth: Temperature01:27

Factors Influencing Microbial Growth: Temperature

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Microorganisms display remarkable adaptations, enabling them to thrive in diverse ecological niches across a wide range of temperatures. Temperature profoundly influences microbial growth by affecting enzymatic activity, membrane fluidity, and other cellular processes.Each microorganism operates within a specific temperature range defined by three cardinal points: minimum, optimum, and maximum. Below the minimum temperature, membranes lose fluidity, halting transport processes. Above the...
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Microbial Growth Measurement: Indirect Methods01:27

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Estimating microbial growth is essential for understanding population dynamics and environmental adaptations. Indirect methods provide valuable insights by measuring parameters such as turbidity, metabolic activity, and biomass, enabling efficient and reproducible assessments.During exponential growth, microbial cells scatter light proportionally to their biomass, a principle used in turbidity measurements. About one million cells per milliliter produce detectable scattering, which a...
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Physical Methods for Controlling Microbial Growth: Temperature01:23

Physical Methods for Controlling Microbial Growth: Temperature

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Heat is a widely used method to control microbial growth by targeting and denaturing cellular proteins, thereby killing or inactivating microbes. This method's effectiveness is quantified using parameters such as the thermal death point (TDP), thermal death time (TDT), and decimal reduction time (D value). TDP represents the lowest temperature at which all microorganisms in a liquid suspension are eliminated within 10 minutes, whereas TDT is the time necessary to achieve sterilization at a...
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Environmental Applications of Microorganisms01:30

Environmental Applications of Microorganisms

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Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
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Hyperthermophilic Bacteria01:21

Hyperthermophilic Bacteria

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Domain Bacteria includes some unique hyperthermophilic species. They exhibit remarkable adaptations that enable survival in extreme environments.Thermotoga species are rod-shaped, gram-negative, non-sporulating hyperthermophiles that form a sheath-like envelope called a toga. They ferment sugars or starch, producing lactate, acetate, CO₂, and H₂, and can also grow via anaerobic respiration using H₂ and ferric iron. Found in hot springs and hydrothermal vents, over 20% of their...
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Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
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Temperature-mediated microbial carbon utilization in China's lakes.

Yao Guo1,2, Songsong Gu2,3, Kaixuan Wu1,2

  • 1State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, the People's Republic of China.

Global Change Biology
|July 10, 2023
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Warming temperatures boost aquatic microbial carbon use by altering bacterial communities and their interactions. This research reveals how microbes in lakes adapt to climate change, impacting carbon cycling.

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Area of Science:

  • Environmental microbiology
  • Aquatic ecology
  • Biogeochemical cycles

Background:

  • Microbes are crucial for aquatic carbon cycling.
  • Understanding microbial functional responses to temperature changes across large areas is limited.

Purpose of the Study:

  • To explore how microbial communities utilize carbon substrates along a temperature gradient.
  • To identify ecological mechanisms driving these changes in response to climate change.

Main Methods:

  • Utilized a space-for-time substitution approach across 47 lakes in China.
  • Analyzed microbial community composition and carbon substrate utilization along a ~15°C temperature gradient.

Main Results:

  • Warmer lakes showed lower carbon concentrations and higher carbon utilization.
  • Bacterial community shifts (increased Cyanobacteria, Actinobacteriota; decreased Proteobacteria) correlated with temperature.
  • Core microbial species changed, impacting amino acid, carbohydrate, and general carbon substrate utilization.

Conclusions:

  • Temperature significantly mediates aquatic carbon utilization by altering microbial community structure and interactions.
  • Identifying core species offers insights into potential carbon sequestration in inland waters under future warming.