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Related Concept Videos

Development of the Chick07:24

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The chicken embryo (Gallus gallus domesticus) provides an economical and accessible model for developmental biology research. Chicks develop rapidly and are amenable to genetic and physiological manipulations, allowing researchers to investigate developmental pathways down to the cell and molecular levels.
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Three Different Protocols of Corneal Collagen Crosslinking in Keratoconus: Conventional, Accelerated and Iontophoresis07:29

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Corneal collagen cross-linking (CXL) is the only conservative treatment currently available to halt keratoconus progression by improving the biomechanical rigidity of the corneal stroma. The aim of this manuscript is to highlight the methods of three different protocols of CXL: conventional CXL (C-CXL), accelerated CXL (A-CXL), and iontophoresis CXL...
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Collagens are the Major Structural Proteins of ECM01:13

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Three main types of fibers are secreted by fibroblasts: collagen fibers, elastic fibers, and reticular fibers. Collagen fiber is made from fibrous protein subunits linked together to form a long, straight fiber. Collagen fibers, while flexible, have great tensile strength, resist stretching, and give ligaments and tendons their characteristic resilience and strength. These fibers hold connective tissues together, even during the body's movement.
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Optimized Ex-ovo Culturing of Chick Embryos to Advanced Stages of Development05:47

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Viewing and accessing the chicken embryo during development can be challenging. We have developed an ex ovo method that is simple, cost effective, and can easily be used in a classroom or research setting. This method provides access to the embryo into late stages of embryonic development (HH 40).
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Fruit Development, Structure, and Function01:58

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Fruits form from a mature flower ovary. As seeds develop from the ovules contained within, the ovary wall undergoes a series of complex changes to form fruit. In some fruits, such as soybeans, the ovary wall dries; in other fruits, such as grapes, it remains fleshy. In some cases, organs other than the ovary contribute to fruit formation; such fruits are called accessory fruits.
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Seed structures are composed of a protective seed coat surrounding a plant embryo, and a food store for the developing embryo. The embryo contains the precursor tissues for leaves, stem, and roots. The endosperm and cotyledons—seed leaves—act as the food reserves for the growing embryo.
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Updated: Jan 20, 2026

Development of the Chick: Egg Formation and Key Events in Development
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Quantification of collagen structural changes during chick corneal development.

Sheng-Lin Lee1, Ming-Ye He1, Yang-Fang Chen1

  • 1Department of Physics, National Taiwan University, Taipei, Taiwan, ROC.

Journal of Biophotonics
|August 30, 2019
PubMed
Summary
This summary is machine-generated.

Collagen assembly in developing corneas was quantified using advanced microscopy. Corneal structure parameters, including rotation, change during development and are correlated between left and right eyes.

Keywords:
collagencorneal developmentmultiphoton microscopynonlinear optical imaging

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Area of Science:

  • Ophthalmology
  • Developmental Biology
  • Biophysics

Background:

  • Collagen, the most abundant mammalian protein, is crucial for tissue structure.
  • Abnormal collagen development in the cornea can cause congenital eye conditions like microcornea and cornea plana.
  • Understanding corneal collagen assembly is vital for preventing and treating developmental eye diseases.

Purpose of the Study:

  • To quantify corneal structural parameters during chick development.
  • To investigate the modulation of collagen organization in the developing cornea.
  • To explore the correlation of corneal structures between the left and right eyes.

Main Methods:

  • Fast Fourier Transform Second Harmonic Generation (FFT-SHG) microscopy was employed.
  • Quantitative analysis of corneal stroma parameters was performed.
  • Data was collected throughout embryonic development stages (E9-E19).

Main Results:

  • Significant modulation of rotational pitch and overall rotational angle of the corneal stroma was observed between embryonic days 9 and 19.
  • Corneal structural development showed a high degree of correlation between the left and right eyes.
  • FFT-SHG microscopy provided detailed insights into collagen organization dynamics.

Conclusions:

  • Corneal collagen undergoes dynamic structural changes during development.
  • The synchronized development of left and right corneas suggests underlying coordinated genetic or environmental factors.
  • These findings contribute to understanding normal cornea development and potential mechanisms for congenital corneal abnormalities.