Related Experiment Video
Updated: Jul 29, 2025
07:26
Vertical Immobilization Method for Time-Lapse Microscopy Analysis in Filamentous Cyanobacteria
Published on: September 25, 2023
998
Controlled motility in the cyanobacterium Trichodesmium regulates aggregate architecture
Ulrike Pfreundt1, Jonasz Słomka1, Giulia Schneider1
1Institute of Environmental Engineering, Department of Civil, Environmental and Geomatic Engineering, ETH Zurich, Zürich, Switzerland.
Science (New York, N.Y.)
|May 25, 2023
Summary
Marine cyanobacteria like Trichodesmium rapidly change their aggregate shape by "smart reversals." This self-organized behavior regulates their structure and ocean biogeochemical impact.
Area of Science:
- Marine microbiology
- Biogeochemistry
- Cyanobacteria research
Background:
- Oceanic nitrogen fixation is crucial for marine ecosystems.
- Cyanobacteria, particularly *Trichodesmium*, play a significant role in nitrogen fixation.
- *Trichodesmium* forms aggregates with unique properties compared to single filaments.
Purpose of the Study:
- To investigate the dynamic shape modulation of *Trichodesmium* aggregates.
- To understand the mechanisms underlying aggregate reorganization in response to environmental changes.
- To link single-filament behavior to aggregate-level dynamics and ecological function.
Main Methods:
- Video microscopy to observe aggregate behavior in real-time.
- Mathematical modeling to analyze filament interactions and movement patterns.
- Controlled experiments to assess responses to environmental stimuli.
Main Results:
- *Trichodesmium* aggregates exhibit rapid shape modulation within minutes.
- Aggregate reorganization is driven by
- smart reversals
- of gliding filaments.
- Filaments reverse direction when overlap decreases, enabling self-organized structural changes without central coordination.
Conclusions:
- Single-filament gliding motility and reversal behavior are key to *Trichodesmium* aggregation.
- Dynamic aggregate architecture influences the ecological role of *Trichodesmium* in the ocean.
- Understanding these mechanisms is vital for predicting marine biogeochemical cycles.
Related Concept Videos
01:27Diversity of Protists IV
50
Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
50
01:24Microtubules in Cell Motility
3.3K
Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...
3.3K
01:18Flagella and Motility in Bacteria
81
Flagella are specialized, thread-like structures that extend from a bacteria's cell envelope. They play a crucial role in motility and chemotaxis. Their structural organization and functioning exemplify sophisticated biological engineering, enabling bacterial survival and adaptability in diverse environments.Structure of the FlagellumA bacterial flagellum consists of three key components: the filament, the hook, and basal body. The filament, a long, helical structure composed of repeating...
81
01:23Surface Appendages of Archaea
49
Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...
49
02:17Microtubule Instability
5.2K
Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
5.2K
01:05Mechanism of Ciliary Motion
3.7K
The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
3.7K