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Related Concept Videos

Exocrine Glands: Methods of Secretion01:08

Exocrine Glands: Methods of Secretion

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Exocrine glands are those that release their secretions through ducts. Based on their mode of secretion, they can be classified into merocrine, apocrine, and holocrine.
Merocrine Secretion
Merocrine secretion is the most common type of exocrine secretion. The secretions are enclosed in vesicles and moved to the cell's apical surface, where the contents are released by exocytosis. For example, mucous, a watery secretion rich in the glycoprotein mucin, is a merocrine secretion. The eccrine...
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Cells and Secretions of the Pancreas01:16

Cells and Secretions of the Pancreas

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The pancreas, a vital organ within the abdominal cavity, plays dual roles in the digestive and endocrine systems, collaborating with exocrine and endocrine cells to maintain optimal digestion and blood sugar levels.
Exocrine function is carried out by acinar cells, organized into clusters known as acini. These cells contribute to digestion by releasing substantial quantities of enzyme-rich, alkaline digestive juices.
Concurrently, the dispersed clusters of endocrine cells throughout the...
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Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

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Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a...
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Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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Dynamic Equilibrium02:20

Dynamic Equilibrium

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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

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In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...
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Updated: Feb 9, 2026

A Closed-Type Wireless Nanopore Electrode for Analyzing Single Nanoparticles
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Method for Dynamically Detecting Secretions from Single Cells Using a Nanopore.

Eamonn Kennedy, Mohammad Hokmabadi, Zhuxin Dong

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    |June 6, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Detecting tiny amounts of secreted proteins from single cancer cells is now possible using nanopore technology. This method quickly differentiates cancer cell lines and identifies key biomarkers like CCL5.

    Keywords:
    Molecular diagnosticscell phenotypenanoporeprotein discriminationsingle-molecule spectroscopy

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    Area of Science:

    • Biotechnology
    • Nanotechnology
    • Cancer Research

    Background:

    • Secreted proteins are crucial for cell-to-cell communication and reveal cellular phenotypes.
    • Detecting these proteins is challenging due to minute quantities and dilution in biological samples.

    Purpose of the Study:

    • To demonstrate the detection and dynamic analysis of single cancer cell secretions using nanopore technology.
    • To establish a method for real-time differentiation of cancer cell lines based on their secretomes.

    Main Methods:

    • Utilizing nanopore-based blockade measurements of single molecules translocating through a membrane.
    • Analyzing the distribution of electrolytic current blockades to characterize cell secretions.

    Main Results:

    • Successfully detected and dynamically analyzed secretions from single cancer cells.
    • Differentiated three distinct cancer cell lines (U937, MDA-MB-231, MCF-7) in under 20 seconds.
    • Identified specific molecular blockades corresponding to biomarkers including CCL5, PI3, TIMP1, and MMP1.

    Conclusions:

    • Nanopore blockade analysis is a viable method for rapid, real-time characterization of cancer cell secretomes.
    • This technique can identify key biomarkers, such as CCL5, offering insights into cancer progression and cellular phenotype.