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Related Concept Videos

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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Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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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.
Modular bricks are the most common type and are sized to include the mortar joint, which is essential for...
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Maximum Size of Aggregate01:12

Maximum Size of Aggregate

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The maximum size of aggregate is defined as the aperture of the sieve retaining 15 percent or more of the particles present in the aggregate sample. The aggregate's maximum size impacts the concrete's water requirement, workability, and strength. Larger aggregates reduce the surface area needing cement paste coverage, which can lower water needs, thereby allowing a decrease in the water-to-cement ratio when the desired workability and richness of the mix are to be maintained, which can...
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Sample Size Calculation01:19

Sample Size Calculation

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Knowledge of the sample size is the first requirement to conduct random sampling or an experiment. The sample size is the total number of units, observations, or groups (in some cases) used to get the data to estimate a population parameter. As the name suggests, the sample size is that of the sample drawn from the population and differs from the population size.
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Related Experiment Video

Updated: Feb 2, 2026

Protein Digestion, Ultrafiltration, and Size Exclusion Chromatography to Optimize the Isolation of Exosomes from Human Blood Plasma and Serum
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Protein Digestion, Ultrafiltration, and Size Exclusion Chromatography to Optimize the Isolation of Exosomes from Human Blood Plasma and Serum

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One size does not fit all: Size-based plasma DNA diagnostics.

Ellen Heitzer1,2,3, Michael R Speicher4,2

  • 1Institute of Human Genetics, Diagnostic and Research Center for Molecular BioMedicine, Medical University of Graz, A-8010 Graz, Austria.

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Summary
This summary is machine-generated.

Investigating the biological characteristics of circulating cell-free DNA can broaden its use in cancer research and treatment. This understanding is key for advancing oncology applications.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biochemistry

Background:

  • Circulating cell-free DNA (cfDNA) is DNA found in bodily fluids.
  • Understanding cfDNA's biological properties is crucial for its clinical utility.

Purpose of the Study:

  • To explore the biological characteristics of plasma cell-free DNA.
  • To identify potential new applications of cfDNA in oncology.

Main Methods:

  • Literature review and analysis of existing studies on cfDNA.
  • Synthesis of current knowledge on cfDNA biology.

Main Results:

  • Plasma cfDNA exhibits unique biological properties.
  • These properties suggest novel diagnostic and therapeutic avenues in cancer.

Conclusions:

  • Further research into cfDNA biology is warranted.
  • Expanded understanding can significantly enhance cfDNA's role in oncology.