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Related Concept Videos

Bricks01:14

Bricks

Bricks, a fundamental building material, are crafted from fired clay and exhibit a range of shapes, sizes, and colors. The production process starts with extracting local clay or shale, which is then crushed, ground, and screened for a fine texture. The refined material is blended with water, creating a pliable mixture that can be formed into bricks using one of three processes: soft mud, dry press, or stiff mud methods.
Soft mud bricks are shaped in molds with high moisture content and can be...
Setting Time of Cement01:12

Setting Time of Cement

The setting time of cement refers to the process of cement paste transitioning from a plastic state to a solid state. This process is crucial in construction as it dictates the timeframe for concrete placement, compaction, and finishing. The onset of this solidification is termed the initial set, indicating when the paste becomes unworkable. The final set is when the paste has solidified completely, and further handling or manipulation can no longer affect its shape. The cement strength is...
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Brick sizing plays a crucial role in construction, influencing both the aesthetics and structural integrity of buildings. Bricks are defined by three dimensions: width, thickness, and length. They are commonly designed to fit modular measurements, typically in multiples of 4 inches or 8 inches in width, to facilitate uniform construction and compatibility with other building materials.
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Brick Cutting Techniques

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The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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Related Experiment Video

Updated: Jul 4, 2026

Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury
07:06

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Published on: March 21, 2025

Lego clocks: building a clock from parts.

Michael Brunner1, Mirre J P Simons, Martha Merrow

  • 1University of Heidelberg Biochemistry Center, 69120 Heidelberg, Germany. michael.brunner@bzh.uni-heidelberg.de

Genes & Development
|June 4, 2008
PubMed
Summary

Circadian clocks in Synechococcus elongatus may involve multiple oscillators, similar to eukaryotes. Alternatively, the pacemaker mechanism might rely on the ATP hydrolysis rate of the KaiC clock protein.

Area of Science:

  • Microbiology
  • Biochemistry
  • Chronobiology

Background:

  • The molecular mechanisms underlying circadian clocks in prokaryotes, such as Synechococcus elongatus, are still under investigation.
  • Eukaryotic circadian clocks are often characterized by complex, multi-oscillator systems.

Discussion:

  • A recent study suggests that Synechococcus elongatus circadian clocks might utilize multiple oscillator systems, mirroring eukaryotic models.
  • This finding prompts speculation about the fundamental organization of prokaryotic biological clocks.
  • An alternative interpretation posits that the primary pacemaker mechanism resides in the ATP hydrolysis rate of the KaiC protein.

Key Insights:

  • Synechococcus elongatus circadian clock may involve multiple interacting oscillators.
  • The role of KaiC protein's ATP hydrolysis rate as a primary pacemaker is re-evaluated.

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  • Prokaryotic circadian clock mechanisms may share similarities with eukaryotic systems.

    • Outlook:

    • Further research is needed to elucidate the precise molecular architecture of the Synechococcus elongatus circadian clock.
    • Investigating the interplay between potential multiple oscillators and the KaiC protein's function will be crucial.
    • Comparative studies between prokaryotic and eukaryotic circadian systems can yield deeper insights into conserved and divergent mechanisms.