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Related Concept Videos

ATP Driven Pumps III: V-type Pumps01:30

ATP Driven Pumps III: V-type Pumps

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V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
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ATP Driven Pumps II: P-type Pumps01:34

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The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V.
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Concrete in large quantities can be pumped across long distances for placing in inaccessible sites. This system comprises a hopper that receives concrete from a mixer, a pump to propel the concrete, and pipelines that facilitate its delivery.
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Refrigerators and Heat Pumps01:07

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Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, whereas, for a heat pump, the focus is on dumping heat into one particular area. A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Tc and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work W is done on the engine’s working substance.
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ATP Driven Pumps I: An Overview01:27

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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Near-infrared to visible upconversion imaging using a broadband pump laser.

Romain Demur, Renaud Garioud, Arnaud Grisard

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    This study demonstrates enhanced upconversion imaging, achieving a 10x increase in resolved spatial elements using a broadband pump laser for near-infrared to visible light conversion. The technique shows comparable sensitivity to direct InGaAs camera detection.

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    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Materials Science

    Background:

    • Upconversion imaging offers a pathway for visualizing near-infrared (NIR) signals in the visible spectrum.
    • Traditional upconversion methods often face limitations in spatial resolution and the number of detectable elements.

    Purpose of the Study:

    • To develop and demonstrate an improved upconversion imaging technique.
    • To enhance the number of resolved spatial elements and overall performance compared to narrowband excitation.

    Main Methods:

    • Utilized a dedicated broadband pump laser for excitation.
    • Performed upconversion imaging experiments converting NIR to visible light.
    • Quantified spatial elements, field of view, resolution, and conversion efficiency.

    Main Results:

    • Achieved up to 56x64 spatial elements with a 2.7 nm pump spectrum.
    • Demonstrated over a 10-fold increase in resolved elements compared to narrowband lasers.
    • Experimental results aligned well with theoretical simulations.
    • Computed sensitivity was found to be competitive with direct InGaAs camera detection.

    Conclusions:

    • Broadband excitation significantly enhances the performance of upconversion imaging.
    • The developed method offers a promising alternative for sensitive NIR imaging applications.
    • The technique shows potential for applications requiring high spatial resolution and sensitivity.