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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.
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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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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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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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Fluorescent PCDTBT Nanoparticles with Tunable Size for Versatile Bioimaging.

Srujan Cheruku1, Lien D'Olieslaeger1, Nick Smisdom2

  • 1Nanobiophysics and Soft Matter Interfaces group (NSI), Institute for Materials Research (IMO-IMOMEC), UHasselt-Hasselt University, 3590 Diepenbeek, Belgium.

Materials (Basel, Switzerland)
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Polymer nanoparticles made from PCDTBT are effective near-infrared bio-imaging agents. These non-toxic nanoparticles show excellent brightness and are successfully used in cancer cell imaging.

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Area of Science:

  • Materials Science
  • Biotechnology
  • Nanotechnology

Background:

  • Conjugated polymer nanoparticles offer unique optical properties for bio-imaging.
  • Developing efficient and safe fluorescent probes is crucial for advanced biomedical applications.

Purpose of the Study:

  • To synthesize poly([9-(1 omino-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophene-diyl) (PCDTBT) nanoparticles of varying sizes.
  • To investigate the impact of nanoparticle size on optical properties and bio-imaging capabilities.
  • To evaluate the cytotoxicity and cellular uptake of PCDTBT nanoparticles.

Main Methods:

  • Synthesis of PCDTBT nanoparticles using mini-emulsion and emulsion/solvent evaporation techniques.
  • Characterization of optical properties via UV-Vis absorption and fluorescence emission spectroscopy.
  • Assessment of cytotoxicity and cellular uptake in human lung cancer A549 cells.
  • In situ particle dynamics study using raster image correlation spectroscopy.

Main Results:

  • PCDTBT nanoparticles exhibit fluorescence emission maximum around 710 nm, within the biological near-infrared window.
  • Photoluminescence quantum yield demonstrated a size-dependent trend.
  • Particles were found to be non-cytotoxic and readily internalized by A549 cells.
  • All synthesized nanoparticles displayed excellent fluorescent brightness for bioimaging applications.

Conclusions:

  • PCDTBT nanoparticles are versatile and effective fluorescent probes for near-infrared bio-imaging.
  • Particle size influences optical properties, but all sizes offer high fluorescence brightness.
  • PCDTBT nanoparticles show significant potential for advanced cellular imaging and diagnostics.