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Related Concept Videos

Applications of Integration to Probability Density Functions01:27

Applications of Integration to Probability Density Functions

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Continuous probability distributions are used to model random variables that can take on any real value within a specified range. These variables do not take on isolated or countable values but rather exist on a continuum. For example, the height of an individual can be measured with increasing precision—such as 163.5 or 165.25 centimeters—demonstrating that height is a continuous random variable.The behavior of such variables is described using a probability density function (PDF),...
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Density00:56

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Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Isolation of High-density Lipoproteins for Non-coding Small RNA Quantification
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Detecting the functional complexities between high-density lipoprotein mimetics.

Yoshitaka J Sei1, Jungho Ahn2, Taeyoung Kim3

  • 1George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA; Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA 30332, USA.

Biomaterials
|April 14, 2018
PubMed
Summary
This summary is machine-generated.

Engineered HDL-mimetic nanoparticles (eHNPs) from apolipoprotein A1 (apoA1) show superior anti-inflammatory and drug delivery capabilities compared to those made with apoA1-mimetic peptides like reverse-4F (r4F). Further research is needed to fully replicate natural HDL functionality.

Keywords:
ApoA1-mimeticApolipoprotein A1Drug deliveryMicrofluidicsNanoparticles

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Area of Science:

  • Nanomedicine
  • Biochemistry
  • Cardiovascular Research

Background:

  • High-density lipoprotein (HDL) regulates lipid homeostasis and reverse cholesterol transport.
  • Apolipoprotein A1 (apoA1) is the primary protein scaffolding HDL nanoparticles (NPs).
  • ApoA1-mimetic peptides, such as reverse-4F (r4F), are cost-effective alternatives for HDL-based therapies.

Purpose of the Study:

  • To uncover functional differences between engineered HDL-mimetic NPs (eHNPs) made from apoA1 (eHNP-A1) and from r4F (eHNP-r4F).
  • To compare the form, function, and medical applicability of eHNP-A1 and eHNP-r4F.
  • To assess the potential of these NPs in nanomedicine and multi-disease therapies.

Main Methods:

  • Computational molecular dynamics (MD) simulations.
  • Advanced microfluidic NP synthesis and screening.
  • In vivo animal model studies.

Main Results:

  • eHNPs share structural and compositional similarities but differ in NP stability and organization.
  • eHNP-A1 demonstrated significantly stronger anti-inflammatory responses via scavenger receptor class B type 1 (SR-B1) pathways.
  • eHNP-A1 outperformed eHNP-r4F in delivering a model hydrophobic drug to an in vivo tumor.

Conclusions:

  • Biomimetic microfluidic technologies and MD simulations enabled detailed comparative analysis of eHNPs.
  • While eHNP-r4F mimics natural HDL nanoparticle function, it does not fully replicate it.
  • Challenges remain in fully reconstituting the functionality of human-derived HDL NPs using synthetic peptides.