Labellum Contact Position
Labellum Contact Position - Related Videos
01:13
Contact Angle
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2023
When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces. The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive force...
08:25
Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis
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Cited by 2 •
2022
Contact hypersensitivity (CHS) is a murine experimental model of allergic contact dermatitis (ACD). CHS is based on sensitization with reactive hapten by painting the shaved skin of the chest and abdomen, with a subsequent ear skin challenge with a diluted hapten, causing a swelling reaction that is assessed in various ways.
03:55
Larval Contact Assay: A Procedure to Evaluate Mosquito Larval Mortality following Direct Contact with Test Larvicidal Compound
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2025
In this video, we describe the larval contact assay to evaluate the toxicity of the dopamine receptor antagonist amitriptyline on the third instar stage larvae of mosquitoes, known vectors of several human infectious diseases. Assessing the larval mortality upon incubation with different amitriptyline concentrations over different time intervals helps determine its lethal concentration 50.
02:32
Position-effect Variegation
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2020
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
08:28
Development of an In Vitro Ocular Platform to Test Contact Lenses
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Cited by 14 •
2016
Current in vitro models for evaluating contact lenses (CLs) and other eye-related applications are severely limited. The presented ocular platform simulates physiological tear flow, tear volume, air exposure and mechanical wear. This system is highly versatile and can be applied to various in vitro analyses with CLs.
FAQs
Labellum contact position is shaped by the combined effects of labellum shape, orientation, texture, and visual or chemical cues. These features can guide a pollinator along a particular route rather than allowing contact anywhere on the flower. The route determines which part of the pollinator meets the flower’s reproductive structures, making floral architecture central to precise pollen placement.
Contact location matters because pollen may attach to or be removed from a particular body region during a visit. If the floral pathway repeatedly brings that region against reproductive structures, the flower can influence the position of pollen transfer. This spatial control helps explain why some flowers depend on close correspondence between pollinator movement and floral structure.
Specialization arises when floral features direct pollinators toward a restricted contact route and a predictable point of interaction with reproductive structures. Such precision links the flower’s architecture to a particular pattern of pollen placement or removal. In this way, contact position provides a mechanism for studying how floral form can support specialized plant–pollinator interactions.
Visual and chemical cues can influence where a pollinator moves before physical contact occurs. Their importance lies in how they interact with the labellum’s shape, orientation, and texture: together, these signals can channel a visit toward a repeatable pathway. Researchers therefore consider both sensory guidance and mechanical contact when interpreting pollination.
When examining labellum contact position, researchers should relate the pollinator’s point of touch to the labellum’s shape, orientation, texture, and associated visual or chemical cues. They can then interpret how that pathway brings the pollinator into contact with reproductive structures. This links floral traits to pollen attachment, removal, and transfer.
Orchids are especially informative because their floral architecture can be highly specialized, making the relationship between a pollinator’s route and reproductive contact easier to examine. Studying the labellum in this context helps connect visible floral traits with pollen placement, pollinator interaction, and the mechanisms that support precise pollination.
Analysis of contact position can connect individual flower visits with broader questions about adaptation and evolution. It shows how floral traits may guide pollinators, control where pollen is attached or removed, and influence transfer between flowers. These links help explain reproductive success and the diversification of precise plant–pollinator interactions.