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Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
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Iron: More than Meets the Eye.

Ethan R Naquin1, Richa Garg1, William J Chen1

  • 1Department of Ophthalmology, School of Medicine, Saint Louis University, Saint Louis, MO 63104, USA.

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|September 27, 2025
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Summary
This summary is machine-generated.

Iron imbalance, both deficiency and overload, significantly impacts eye health, contributing to various ocular disorders. Maintaining iron homeostasis is crucial for preserving vision and requires further research for effective treatments.

Keywords:
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Area of Science:

  • Ophthalmology and Vision Science
  • Nutritional Biochemistry
  • Cellular Metabolism

Background:

  • Iron is vital for ocular functions like respiration and DNA synthesis.
  • Imbalances in iron homeostasis (deficiency or overload) are linked to numerous anterior and posterior segment eye diseases.
  • Dysregulated iron metabolism contributes to oxidative stress, lipid peroxidation, and mitochondrial dysfunction in the eye.

Purpose of the Study:

  • To review the dual role of iron overload and deficiency in ocular pathologies.
  • To explore the molecular mechanisms of iron-mediated damage in the eye.
  • To discuss current and emerging therapeutic strategies for iron-related ocular conditions.

Main Methods:

  • Narrative review of existing literature.
  • Analysis of molecular mechanisms of iron dysregulation in ocular tissues.
  • Examination of clinical manifestations and therapeutic approaches.

Main Results:

  • Iron deficiency impairs retinal bioenergetics and increases oxidative stress.
  • Iron overload generates reactive oxygen species, leading to cellular damage and ferroptosis.
  • Specific proteins (transferrin, ferritin, ferroportin, hepcidin) regulate ocular iron, and their aberrations contribute to disease.

Conclusions:

  • Maintaining iron homeostasis is critical for visual function.
  • Current therapies for iron imbalance in ocular diseases have limitations.
  • Further research is needed to develop targeted ocular delivery systems and refine treatments for iron-related eye conditions.