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The Small x Assumption02:20

The Small x Assumption

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If a reaction has a small equilibrium constant, the equilibrium position favors the reactants. In such reactions, a negligible change in concentration may occur if the initial concentrations of reactants are high and the Kc value is small. In such circumstances, the equilibrium concentration is approximately equal to its initial concentration.  This estimation can be used to simplify the equilibrium calculations by assuming that some equilibrium concentrations are equal to the initial...
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Conservation of Small Populations02:04

Conservation of Small Populations

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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
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Cell Size01:22

Cell Size

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Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
Surface Area
Cells can take in nutrients and water via diffusion through the plasma membrane itself or through specific channels in the membrane. The area of the membrane surrounding...
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Brick Sizes01:21

Brick Sizes

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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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Small-signal Diode Model01:18

Small-signal Diode Model

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In analyzing the behavior of diodes in circuits, the relationship between the current through a diode and the voltage across it is of particular interest, especially when considering the effect of a direct current (DC) bias voltage. When applied, this DC bias influences the diode's operating point, known as the Q point, around which the current-voltage (I-V) characteristic of the diode exhibits exponential behavior. Introducing a small, time-varying signal on top of this bias aids in examining...
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Pascal's Law01:04

Pascal's Law

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In 1653, the French philosopher and scientist Blaise Pascal published "Treatise on the Equilibrium of Liquids," which discussed the principles of static fluids. A static fluid is a fluid that is not in motion. When a fluid is not flowing, we say that the fluid is in static equilibrium. If the fluid is water, we say it is in hydrostatic equilibrium. For a fluid in static equilibrium, the net force on any part of the fluid must be zero; otherwise, the fluid will start to flow. Pascal...
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Related Experiment Video

Updated: Mar 26, 2026

Surgical Size Reduction of Zebrafish for the Study of Embryonic Pattern Scaling
06:31

Surgical Size Reduction of Zebrafish for the Study of Embryonic Pattern Scaling

Published on: May 3, 2019

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Small is Plentiful.

Catherine Masson-Boivin1

  • 1INRA, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR441, Castanet-Tolosan, France; CNRS, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR2594, Castanet-Tolosan, France.

Trends in Plant Science
|January 25, 2016
PubMed
Summary

Horizontal gene transfer in soil bacteria frequently creates diverse rhizobia, the legume symbionts. This micro-scale process leads to new symbiovars, showing function and bacterial taxonomy are often disconnected.

Area of Science:

  • Microbiology
  • Genetics
  • Ecology

Background:

  • Rhizobia are crucial soil bacteria that form symbiotic relationships with legumes.
  • These symbiotic relationships are mediated by specific genes often transferred horizontally between bacteria.
  • Understanding the mechanisms of gene transfer is key to understanding bacterial evolution and community dynamics.

Purpose of the Study:

  • To investigate the frequency and scale of horizontal gene transfer events in rhizobia.
  • To explore the impact of gene transfer on rhizobial diversity and the emergence of novel symbiovars.
  • To assess the relationship between bacterial taxonomy and symbiotic function in soil communities.

Main Methods:

  • Utilized advanced genomic techniques to track gene transfer events at a micro-scale.

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  • Analyzed bacterial populations from diverse soil environments.
  • Employed phylogenetic and functional analyses to characterize rhizobial diversity and symbiotic capabilities.
  • Main Results:

    • Demonstrated frequent micro-scale horizontal gene transfer among soil bacteria, particularly in rhizobia.
    • Observed the emergence of unexpected rhizobial diversity and novel symbiovars within established species.
    • Provided evidence for a significant disconnection between established bacterial taxonomy and actual symbiotic function.

    Conclusions:

    • Horizontal gene transfer is a dynamic and frequent driver of rhizobial evolution and diversity.
    • The study highlights the limitations of traditional taxonomy in reflecting the functional capabilities of bacterial communities.
    • Findings have implications for agriculture, microbial ecology, and understanding bacterial adaptation.