微生物诱导的碳酸沉由Sporosarcina pasteurii:优化生物CaCO沉的案例研究
Michael S Carter1,2, Matthew J Tuttle1,2, Joshua A Mancini1,2
1Materials and Manufacturing Directorate Air Force Research Lab, Wright-Patterson Air Force Base, Dayton, Ohio, USA.
Applied and environmental microbiology
|July 13, 2023
概括
生物水泥通过使用微生物过程进行水泥化,为传统混凝土提供了一个环保的替代方案. 本综述探讨了微生物诱导的碳酸沉 (MICP) 的生物学,以优化可持续的建筑材料.
科学领域:
- 生物技术是生物技术.
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
背景情况:
- 传统的混凝土生产是能源密集型的,对全球二氧化碳排放有很大贡献.
- 生物水泥利用生物过程进行矿化,为传统混凝土提供了一个可持续的替代方案.
- 菌是生物凝固中的关键微生物,但其生物机制需要进一步研究.
研究的目的:
- 综合有关生物碳酸沉 (CaCO3) 和微生物诱导碳酸沉 (MICP) 的当前知识.
- 专注于Sporosarcina pasteurii作为生物水泥生产的模型生物.
- 开发MICP中分子和细胞过程的模型,用于生物凝固.
主要方法:
- 文献综述综合材料科学,微生物学,生物化学和细胞生物学方面的证据.
- 对生物CaCO3沉机制的分析.
- 使用Sporosarcina pasteurii开发一个MICP模型.
主要成果:
- 生物凝固依赖于生物结构来结合聚合材料.
- 粉素促进微生物诱导的碳酸沉 (MICP).
- 提出了一个模型,详细描述了由S. pasteurii将尿素和Ca2+转化为水泥的过程.
结论:
- 对MICP生物学的进一步研究对于优化生物水泥生产至关重要.
- 对Sporosarcina pasteurii进行有针对性的研究可以提高生物水泥的效率和可持续性.
- 生物水泥具有作为环保建筑材料的巨大潜力.
更多相关视频
相关概念视频
Factors Affecting Solubility
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
Precipitation Processes
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
Colloidal precipitates
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
Types of Coprecipitation
Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
Precipitation and Co-precipitation
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Endospores and Sporulation
Endospores are specialized, dormant cells primarily formed by Gram-positive bacteria, including Bacillus and Clostridium, enabling survival under extreme environmental conditions. Due to their unique composition and formation process, these structures are highly resistant to physical and chemical insults, such as extreme heat, ultraviolet and ionizing radiation, desiccation, and toxic chemicals. Rare instances of endospore-like structures have also been observed in some Gram-negative bacteria,...


