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Related Concept Videos

What is Natural Selection?01:32

What is Natural Selection?

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Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
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How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
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Updated: Feb 15, 2026

Synthesis and Bioconjugation of Thiol-Reactive Reagents for the Creation of Site-Selectively Modified Immunoconjugates
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Fluorescent Polyvinylphosphonate Bioconjugates for Selective Cellular Delivery.

Christina Schwarzenböck1, Andreas Schaffer1, Elfriede Nößner2

  • 1WACKER-Lehrstuhl für Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße 4, 85748, Garching bei München, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 10, 2018
PubMed
Summary

Researchers developed new polyvinylphosphonate biomolecule conjugates with rapid response times and stable function in biological fluids. These polymers show sharp phase transitions under physiological conditions, enabling targeted cellular delivery.

Keywords:
deliveryfluorescent polymer bioconjugateselective cellular targetingthermoresponsive polymerthiol-ene click chemistry

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Area of Science:

  • Polymer Chemistry
  • Biomaterials Science
  • Nanotechnology

Background:

  • Existing poly(ethylene glycol) (PEG) and poly(N-isopropylacrylamide) (PNIPAAm) biomolecule conjugates often have slow response times, lack bio-inertness, or degrade in biological fluids.
  • There is a need for advanced biomaterials that overcome these limitations for effective biological applications.

Purpose of the Study:

  • To present a novel modular synthetic approach for creating polyvinylphosphonate biomolecule conjugates.
  • To demonstrate the unique phase transition properties of these conjugates under physiological conditions.
  • To showcase the ability to incorporate specific biological functions into the polymer conjugates.

Main Methods:

  • Development of a modular synthetic strategy for polyvinylphosphonate synthesis.
  • Conjugation of biomolecules to the polyvinylphosphonate backbone.
  • Characterization of the phase transition behavior of the conjugates.
  • Demonstration of cellular attachment and uptake using functionalized polymers.

Main Results:

  • The synthesized polyvinylphosphonate conjugates exhibit sharp phase transition temperatures, even under physiological conditions.
  • These conjugates maintain function and stability in biological fluids, unlike some existing materials.
  • Functionalization with cholesterol enabled attachment to cell membranes.
  • Folic acid-anchored polymers were successfully shuttled into cells, demonstrating targeted delivery.

Conclusions:

  • A straightforward synthetic approach yields versatile polyvinylphosphonate biomolecule conjugates.
  • These novel conjugates offer improved performance, including rapid response and stability in biological environments.
  • The demonstrated cellular targeting capabilities highlight their potential for advanced biomedical applications.