Glass Capillary Tubes
Glass Capillary Tubes - Related Videos
01:18
Rise of Liquid in a Capillary Tube
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2023
When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
07:38
Milk Collection in the Rat Using Capillary Tubes and Estimation of Milk Fat Content by Creamatocrit
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Cited by 24 •
2015
Milk is a primary source of nutrition for the neonate. Analysis of milk components may provide insight into maternal factors that affect offspring health. This protocol describes a manual method of collecting milk samples from the lactating rat, which can then be used for further downstream analysis.
14:53
Capillary Electrophoresis Separation of Monoclonal Antibody Isoforms Using a Neutral Capillary
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Cited by 2 •
2017
Here, we present a comprehensive capillary zone electrophoresis protocol for the assessment of intrinsic physicochemical heterogeneity of monoclonal antibodies as a quality attribute.
08:50
Capillary Electrophoresis (CE)
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2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia Capillary electrophoresis (CE) is a separation technique that separates molecules in an electric field according to size and charge. CE is performed in a small glass tube called a capillary that is filled with an electrolyte solution. Analytes are separated due to differences in electrophoretic mobility, which varies with charge, solvent viscosity, and size. Traditional electrophoresis in gels is limited in the amount of voltage...
01:28
The Looking Glass Self
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2025
The concept of the looking-glass self describes how an individual's self-concept is shaped by their perception of how others see them. This psychological theory, first introduced by sociologist Charles Horton Cooley in 1902, posits that self-identity emerges in a social context and is influenced by the judgments—real or imagined—of others.Research suggests that individuals frequently overestimate how positively others perceive them. This is particularly evident in physical self-perception,...
FAQs
Filling occurs through the combined effects of surface tension and adhesion between the liquid and the glass wall. These forces draw the specimen into the narrow channel, so collection or transfer does not require an external pump. In biological work, this passive movement is especially useful when only a very small quantity of liquid is available.
Internal diameter influences how the tube handles limited-volume specimens: a narrow passage supports capillary entry while accommodating only a small amount of liquid. Consistent dimensions also help make measurements and observations reproducible between samples. This precision matters in microsampling and blood-related work, where consuming excess specimen could limit subsequent analysis.
After collection, centrifugation uses the tube as a vessel for separating blood components. The process can distinguish plasma from blood cells, allowing the resulting portions to be examined separately. This adds an analytical step beyond simply holding or transferring liquid: the same microsampling workflow can produce a separated specimen for blood analysis while using a limited sample volume.
A basic workflow starts by collecting a small liquid specimen in the tube, then using it to transfer or measure the sample as required. When the specimen is blood, centrifugation may follow to separate plasma and blood cells. This sequence links microsampling with downstream observation or analysis while keeping handling focused on the available limited-volume specimen.
Applications include microsampling, hematocrit measurements, and blood analysis. These uses take advantage of the tube's ability to handle very small volumes and, when centrifuged, separate plasma from blood cells. They are valuable in biological and clinical settings where specimens are limited and measurements must be made with minimal sample consumption.
Chemical stability, transparency, and precise dimensions are important because they support reproducible observations while the tube handles a small specimen. In biological and clinical work, these characteristics allow researchers and clinicians to inspect or measure limited-volume samples with less material consumption. The value is therefore both observational and practical: stable, visible, dimensionally consistent handling.