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Microbial Growth Measurement: Indirect Methods01:27

Microbial Growth Measurement: Indirect Methods

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...
Microbial Mats01:25

Microbial Mats

Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
Microbial Growth Measurement: Direct Methods01:23

Microbial Growth Measurement: Direct Methods

Direct methods for measuring microbial populations in a culture are essential tools in microbiology, providing quantitative data for various applications. Among these, microscopic counts, plate counts, and serial dilution are widely used techniques, each with unique principles and applications.Microscopic CountsMicroscopic counting involves the use of a Petroff-Hausser chamber, a specialized microscope slide with a grid and defined depth. By observing a liquid culture under a microscope,...
Microenvironments01:22

Microenvironments

Microorganisms inhabit highly localized spaces known as microenvironments, which are defined by distinct physical and chemical characteristics. These include oxygen concentration, pH, temperature, light availability, and nutrient levels. The conditions within a microenvironment can differ markedly from those in the surrounding area and significantly influence microbial growth, metabolism, and community structure.Microenvironments often display sharp physicochemical gradients over small spatial...
Microvilli00:55

Microvilli

Microvilli are tiny finger-like projections found on the surface of certain cells. Their purpose is to increase the surface area of the cell's apical surface, resulting in more effective absorption or secretion of substances.
These microvilli are predominantly present in cells lining the small intestine, kidney tubules, and certain cells in the respiratory and reproductive systems. By significantly expanding the surface area of the cell membrane, microvilli enhance the cell's capacity to...

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Related Experiment Video

Updated: Jul 12, 2026

Development of Microfluidic Devices to Study the Elongation Capability of Tip-growing Plant Cells in Extremely Small Spaces
07:01

Development of Microfluidic Devices to Study the Elongation Capability of Tip-growing Plant Cells in Extremely Small Spaces

Published on: May 22, 2018

Tip growth in micrasterias.

T Lacalli, A B Acton

    Science (New York, N.Y.)
    |February 15, 1974
    PubMed
    Summary

    Methylation in Micrasterias primary walls occurs at sites of maximum extension. This process may indicate the incorporation of matrix substances during cell growth, rather than directly causing it.

    Area of Science:

    • Plant cell biology
    • Biochemistry
    • Developmental biology

    Background:

    • The primary wall of Micrasterias, a freshwater alga, undergoes dynamic changes during cell growth.
    • Polysaccharide modification, including methylation, plays a role in cell wall dynamics.
    • Fungal hyphal growth provides a comparative model for understanding localized cell wall extension.

    Purpose of the Study:

    • To investigate the localization and role of polysaccharide methylation in the growing primary wall of Micrasterias.
    • To determine if methylation is a cause or indicator of cell wall extension.
    • To explore the relationship between methylation and hemicellulosic matrix incorporation.

    Main Methods:

    • Microscopic analysis of Micrasterias cell walls.

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    Imaging the Root Hair Morphology of Arabidopsis Seedlings in a Two-layer Microfluidic Platform

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    Related Experiment Videos

    Last Updated: Jul 12, 2026

    Development of Microfluidic Devices to Study the Elongation Capability of Tip-growing Plant Cells in Extremely Small Spaces
    07:01

    Development of Microfluidic Devices to Study the Elongation Capability of Tip-growing Plant Cells in Extremely Small Spaces

    Published on: May 22, 2018

    Imaging the Root Hair Morphology of Arabidopsis Seedlings in a Two-layer Microfluidic Platform
    09:23

    Imaging the Root Hair Morphology of Arabidopsis Seedlings in a Two-layer Microfluidic Platform

    Published on: August 15, 2017

  • Biochemical assays to detect polysaccharide methylation.
  • Comparative studies with fungal growth models.

    • Main Results:

    • Methylation of polysaccharides was observed at specific localized points on the growing primary wall.
    • These sites correspond to areas of maximum wall extension.
    • Methylation appears to be associated with, rather than the direct cause of, wall extension.

    Conclusions:

    • Polysaccharide methylation in Micrasterias is spatially correlated with sites of maximal cell wall extension.
    • Methylation likely serves as an indicator of hemicellulosic matrix substance incorporation during growth.
    • This finding offers insights into the mechanisms of algal cell wall expansion.