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Related Concept Videos

The Tongue and Taste Buds00:49

The Tongue and Taste Buds

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The surface of the tongue is covered with various small bumps called papillae, which either distribute what has been ingested (filiform papillae) or contain the sensory taste (or gustatory) receptor cells (fungiform, circumvallate, and foliate papillae). Embedded within each taste-related papilla are the taste buds—clusters of 30 to 100 gustatory receptor cells.
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Basic Continuous Time Signals01:22

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Basic continuous-time signals include the unit step function, unit impulse function, and unit ramp function, collectively referred to as singularity functions. Singularity functions are characterized by discontinuities or discontinuous derivatives.
The unit step function, denoted u(t), is zero for negative time values and one for positive time values, exhibiting a discontinuity at t=0. This function often represents abrupt changes, such as the step voltage introduced when turning a car's...
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Basic Discrete Time Signals01:16

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The unit step sequence is defined as 1 for zero and positive values of the integer n. This sequence can be graphically displayed using a set of eight sample points, showing a step function starting from n=0 and remaining constant thereafter.
The unit impulse or sample sequence is mathematically expressed as zero for all n values except at n=0, where it is one. The unit impulse sequence, denoted by δ(n), is the first difference of the unit step sequence, while the unit step sequence u(n) is the...
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Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

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In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
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Requirements for Human Life01:26

Requirements for Human Life

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The Earth and its atmosphere have provided humans with air, water, and food, but these are not the only requirements for survival. Humans also require a specific range of temperature and pressure that the Earth and its atmosphere provides.
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Taste Buds and Receptors01:20

Taste Buds and Receptors

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Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
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Related Experiment Video

Updated: Feb 14, 2026

Application of Impermeable Barriers Combined with Candidate Factor Soaked Beads to Study Inductive Signals in the Chick
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The time required for positional signalling in the chick wing bud

J C Smith

    Journal of Embryology and Experimental Morphology
    |December 1, 1980
    PubMed
    Summary

    The chick wing bud requires polarizing regions for at least 15 hours to signal positional information and induce limb development. This study estimates the critical time for this developmental process.

    Area of Science:

    • Developmental biology
    • Embryology
    • Molecular biology

    Background:

    • Positional signaling is crucial for embryonic development.
    • The chick wing bud is a model system for studying limb development.
    • The polarizing region's role in limb patterning is well-established.

    Purpose of the Study:

    • To estimate the minimum time required for the polarizing region to exert its signaling function in the chick wing bud.
    • To investigate the kinetics of positional information transfer during limb development.

    Main Methods:

    • Grafting of irradiated quail polarizing regions onto host chick wing buds.
    • Timed removal of grafted polarizing regions at various developmental stages.
    • Analysis of induced limb structures in host wing buds.

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    Main Results:

    • The polarizing region must be present for a minimum of 15 hours to induce supernumerary structures.
    • This duration suggests a time-dependent process for positional signaling.

    Conclusions:

    • Positional signaling in the chick wing bud is a time-dependent process.
    • The findings support a model involving a diffusible morphogen for limb development.