Extraction Lens Function
Extraction Lens Function - Related Videos
08:32
Extraction of Tissue Antigens for Functional Assays
0 Views •
2012
A simple protocol for preparing extracts of human tissue to be used as a source of antigens in functional T-cell assays is described. This method allows T-cell responses to tissue-derived antigens to be measured in vitro.
03:14
Eye Lens Dissection: A Technique to Observe Zebrafish Lens Morphology
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2023
This video describes the protocol which is developed to dissect adult and larval zebrafish lenses to analyze cortical lens morphology and structural integrity of the lens sutures.
08:05
Small-scale Nuclear Extracts for Functional Assays of Gene-expression Machineries
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Cited by 37 •
2012
A protocol for preparation of robust, small-scale HeLa nuclear extracts is described. This protocol is valuable for assays that require use of small populations of cells, such as cells treated with drugs or RNAi. The method should be applicable to a wide variety of gene expression assays and other cell types, including patient cells.
05:14
Simulating the Mechanics of Lens Accommodation via a Manual Lens Stretcher
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Cited by 9 •
2018
We present an efficient method of studying lens accommodation by using a manual lens stretcher. The protocol mimics physiological accommodation by pulling the zonules connected around the lens capsule, thereby, stretching the lens.
10:39
Lens Transplantation in Zebrafish and its Application in the Analysis of Eye Mutants
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Cited by 4 •
2009
Lens development involves interactions with other tissues. Several zebrafish eye mutants are characterized by an abnormally small lens size. Here we demonstrate a lens transplantation experiment to determine whether this phenotype is due to intrinsic causes or defective interactions with tissues that surround the lens.
FAQs
A controlled potential difference establishes an electric field whose strength and direction determine how ions leave the source region. That field pulls charged particles toward the analyzer while redirecting their paths toward a more suitable trajectory. The extraction lens therefore does more than move ions: it conditions their motion before analysis, supporting efficient transmission and reduced beam divergence.
Beam divergence describes the spreading of ion trajectories as particles travel through the instrument. Limiting this spread helps more ions follow paths that enter the analyzer effectively rather than being lost from the transmitted beam. In chemistry applications, better control of divergence can contribute to stronger ion signals and more stable measurement conditions.
Changing the extraction voltage changes the electric-field conditions experienced by ions near the source. As a result, ion intensity, transmission, mass resolution, and signal stability may all be affected. The useful voltage is therefore an instrument-tuning variable rather than a fixed value for every analysis, especially when the chemical sample or desired measurement outcome changes.
The lens provides controlled transfer from the ion-producing region into the analyzer. It helps organize ion trajectories before particles enter the section where their signals are measured, while reducing losses caused by excessive spreading. This interface function connects ion generation with downstream analysis, making lens behavior relevant to the quality and consistency of molecular-ion detection.
Optimization centers on adjusting the extraction voltage and observing its effect on ion transmission and signal behavior. Researchers seek conditions that provide useful ion intensity while maintaining appropriate mass resolution and signal stability. Because the voltage influences several performance measures at once, tuning is an important step when preparing a mass spectrometer for chemical characterization.
Complex samples can contain molecular ions whose detection depends on efficient movement from the ion source into the analyzer. By focusing trajectories and limiting beam divergence, the extraction lens supports transmission of these charged particles for measurement. Its contribution to intensity, resolution, and stability helps researchers characterize molecular ions and interpret chemical samples more reliably.