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The significance of cell motility to microbial community morphogenesis .

机译：细胞活力对微生物群落形态发生的意义。

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摘要

The morphologies of modern and fossil microbial communities are generated through many complex interactions between biological and environmental influences. Community morphology is thus a potential repository of valuable information about the processes involved in morphogenesis. It is this potential storage capacity of microbial community morphology that makes interpreting the microbialite fossil record desirable. However, extracting information about relevant biological and environmental processes from morphologies remains challenging.;This thesis presents a new conceptual framework for recognizing and elucidating connections between morphologies and specific biological behaviors. This framework represents a shift in perspective to a more biologically and process-centric mind-set. Utilizing this approach allows us to envision a new type of morphospace for microbial community morphology that is bounded by a detailed biological boundary. Cell motility is a widespread and common behavior that has emerged as a fundamental process influencing morphogenesis across all scales of microbial communities. Further, cell motility is the biological behavior that inspired and serves as an example of applying this framework. Also introduced here is the discovery that non-directed motility governs the genesis of complex reticulate morphologies in biofilms composed of a strain of the filamentous cyanobacteria, Pseudanabaena. Observations of this laboratory biofilm have improved our understanding of how the gliding and colliding of filamentous cells serves as a mechanism for morphogenesis, as well as of how environmental influences influence and overshadow this motility in morphogenesis. Filamentous cell motility also governs the genesis of complex reticulate morphologies in microbial mats in Pavilion Lake, British Columbia. The discovery and description of the Pavilion mats presented herein includes characterization of how motility influences both micro- and mesoscale microbial community structures. Identifying and characterizing the role of cell motility in morphogenesis sheds new light on the morphogenesis of microbial community morphology in both modern and ancient environments.
机译：现代和化石微生物群落的形态是通过生物学和环境影响之间的许多复杂相互作用而产生的。因此，社区形态学是有关形态发生过程的有价值信息的潜在存储库。正是这种潜在的微生物群落形态存储能力使解释微生物岩化石记录成为可取的。然而，从形态学中提取有关生物学和环境过程的信息仍然具有挑战性。；本论文提出了一个新的概念框架，用于识别和阐明形态学与特定生物学行为之间的联系。这个框架代表了一种观点的转变，转向了以生物学和过程为中心的思维方式。利用这种方法，我们可以为微生物群落形态构想一种新型的形态空间，该形态空间受到详细的生物学边界的限制。细胞运动是一种广泛而普遍的行为，已成为影响所有规模微生物群落形态发生的基本过程。此外，细胞运动性是启发性的生物学行为，并作为应用该框架的一个例子。在此还介绍了一种发现，即非定向运动控制着由丝状蓝细菌菌株Pseudanabaena组成的生物膜中复杂网状形态的发生。对这种实验室生物膜的观察提高了我们对丝状细胞的滑行和碰撞如何作为形态发生机制的理解，以及环境影响如何影响形态形成中的这种运动并使其黯然失色。丝状细胞的运动性还控制着不列颠哥伦比亚省亭子湖微生物垫中复杂网状形态的发生。本文介绍的凉亭垫的发现和描述包括运动性如何影响微生物和中尺度微生物群落结构的特征。鉴定和表征细胞运动在形态发生中的作用为现代和古代环境中微生物群落形态的形态发生提供了新的思路。

著录项

  • 作者

    Shepard, Rebekah Noel.;

  • 作者单位

    University of California, Davis.;

  • 授予单位 University of California, Davis.;
  • 学科 Geology.;Biology Microbiology.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 5 p.
  • 总页数 5
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:38:25

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