温度,化物和酸盐度对Deinococcus radiodurans的代谢活性的影响
Eftychia Symeonidou1,2, Uffe Gråe Jørgensen1,2, Morten Bo Madsen1,2
1Astrophysics and Planetary Science, Niels Bohr Institute, University of Copenhagen, Øster Voldgade 5-7, 1350, Copenhagen, Denmark.
Extremophiles : life under extreme conditions
|July 23, 2024
概括
极端友善的Deinococcus radiodurans在盐度增加和温度下降时显示活动和活力降低. 这种细菌仍然可以在寒冷的,富含甲酸盐的环境中生存并保持活跃,这表明外星生命的潜力.
科学领域:
- 天体生物学 天体生物学
- 极端动物生物学 极端动物生物学
- 微生物生理学 微生物生理学
背景情况:
- Deinococcus radiodurans是一种耐辐射的细菌,有可能在外星生存.
- 过酸盐在火星 regolith 中丰富,这给环境带来了挑战.
- 了解微生物对火星条件的反应对天体生物学至关重要.
研究的目的:
- 研究温度和盐对Deinococcus radiodurans的联合影响.
- 在模拟的火星条件下评估D. radiodurans的代谢活性 (CO2产生) 和生存能力.
- 为了确定D. radiodurans在高酸盐丰富的低温环境中的生存极限.
主要方法:
- 在液态培养中化D. radiodurans,含有不同度的酸盐和化物盐.
- 监测二氧化碳生产率作为代谢活动的衡量标准.
- 在不同温度 (0°C和25°C) 的30天化后评估细菌活力.
主要成果:
- 在高度 (高达10% w/v) 的甲酸盐下,观察到二氧化碳生产和生存能力的减少.
- 随着盐度的增加和温度的降低,新陈代谢活动和活力下降.
- 温度和盐度之间的相互作用效应显著影响了代谢活动.
结论:
- 在高酸盐度和低温度下,Deinococcus radiodurans的代谢活动和活力降低.
- 这种细菌表现出弹性,在寒冷的,富含甲酸盐的环境中保持代谢活跃和活力.
- 这些发现支持D. radiodurans在像火星这样的外星环境中生存和发挥作用的潜力.
更多相关视频
06:09Studying the Protein Quality Control System of D. discoideum Using Temperature-controlled Live Cell Imaging
Published on: December 2, 2016
7.0K
07:28Metabolic Profiling to Determine Bactericidal or Bacteriostatic Effects of New Natural Products using Isothermal Microcalorimetry
Published on: October 29, 2020
8.6K
相关概念视频
01:27Factors Influencing Microbial Growth: Temperature
2.3K
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...
2.3K
01:28Factors Influencing Microbial Growth: Osmolarity
1.7K
Osmolarity is the measure of solute concentration in a solution. It plays a critical role in determining water availability for organisms. Water moves across semipermeable membranes through osmosis, flowing from regions of lower solute concentration (more dilute) to regions of higher solute concentration (more concentrated).In high-solute environments, microbial cells lose water, leading to dehydration and inhibited growth. The extent to which water is available to microbes in such environments...
1.7K
01:23Physical Methods for Controlling Microbial Growth: Temperature
1.7K
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...
1.7K
01:23Stringent Response in E. coli
528
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
528
01:30Diversity of Archaea I
957
Archaea, a domain of single-celled microorganisms, are classified into five major phyla based on genetic and biochemical characteristics: Euryarchaeota, Crenarchaeota, Thaumarchaeota, Korarchaeota, and Nanoarchaeota. Among these, the phylum Euryarchaeota is notable for its remarkable diversity in morphology, metabolism, and ecological adaptations.Morphological and Metabolic DiversityMembers of Euryarchaeota exhibit a variety of cellular shapes, including rods and cocci. Their metabolic pathways...
957
01:29Diversity of Archaea IV
639
Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist...
639