Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Phasor Relationships for Circuit Elements

Phasor Relationships for Circuit Elements

Phasor representation is a powerful tool used to transform the voltage-current relationship for resistors, inductors, and capacitors from the time domain to the frequency domain. This transformation simplifies the analysis of alternating current (AC) circuits.
In the time domain, Ohm's law provides a fundamental relation between the current flowing through a resistor and the voltage across it:

Hair Cells

Hair Cells

Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.

Elements and Compounds

Elements and Compounds

Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond.
Elements
Elements are classified as atomic or molecular based on the nature of their basic units. They are unique forms of matter with specific chemical and physical properties that cannot break down into smaller substances by ordinary chemical reactions. There...

The Periodic Table and Organismal Elements

The Periodic Table and Organismal Elements

Relationship Formation

Relationship Formation

What do you think is the single most influential factor in determining with whom you become friends and whom you form romantic relationships? You might be surprised to learn that the answer is simple: the people with whom you have the most contact. This most important factor is proximity. You are more likely to be friends with people you have regular contact with. For example, there are decades of research that shows that you are more likely to become friends with people who live in your dorm,...

Periodic Classification of the Elements

Periodic Classification of the Elements

The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Podoplanin as a Predictive Marker for Identification of High-Risk Mycosis Fungoides Patients: An Immunohistochemical Study.

Indian journal of dermatology·2021

Same author

Efficacy and safety of plasma gel as a new modality in treatment of atrophic acne scars.

International journal of dermatology·2020

Same author

Evaluation of the effect of combined intralesional injection of prostaglandin F2α with narrow band UVB phototherapy in treatment of resistant cases of vitiligo.

The Journal of dermatological treatment·2019

Same author

Pulsed dye laser versus intense pulsed light in melasma: a split-face comparative study.

The Journal of dermatological treatment·2018

Same author

Serum level of receptor activator of nuclear factor kappa-B ligand in patients with psoriasis.

International journal of dermatology·2015

Same author

Dermoscopic features of acral pigmented lesions in Egyptian patients: a descriptive study.

International journal of dermatology·2015

Search research articles

Related Experiment Video

Updated: Jan 28, 2026

Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron OxyHydroxides, Trace Elements, and Bacteria

Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron OxyHydroxides, Trace Elements, and Bacteria

Published on: December 19, 2017

Relationship between Trace Elements and Premature Hair Graying.

Alshimaa M El-Sheikh¹, Nashwa N Elfar¹, Heba A Mourad²

¹Department of Dermatology and Venereology, Faculty of Medicine, Tanta University, Tanta, Egypt.

International Journal of Trichology

|February 21, 2019

Summary

Premature hair graying (PHG) is linked to lower serum levels of iron, copper, and calcium. These deficiencies correlate with PHG severity, suggesting a role for mineral supplementation.

Keywords:

Calcium copper iron premature hair graying trace elements

More Related Videos

A New Technique for Quantitative Analysis of Hair Loss in Mice Using Grayscale Analysis

A New Technique for Quantitative Analysis of Hair Loss in Mice Using Grayscale Analysis

Published on: March 9, 2015

Collecting Hair Samples for Hair Cortisol Analysis in African Americans

Collecting Hair Samples for Hair Cortisol Analysis in African Americans

Published on: June 10, 2018

Related Experiment Videos

Last Updated: Jan 28, 2026

Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron OxyHydroxides, Trace Elements, and Bacteria

Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron OxyHydroxides, Trace Elements, and Bacteria

Published on: December 19, 2017

A New Technique for Quantitative Analysis of Hair Loss in Mice Using Grayscale Analysis

A New Technique for Quantitative Analysis of Hair Loss in Mice Using Grayscale Analysis

Published on: March 9, 2015

Collecting Hair Samples for Hair Cortisol Analysis in African Americans

Collecting Hair Samples for Hair Cortisol Analysis in African Americans

Published on: June 10, 2018

Area of Science:

Biochemistry
Dermatology
Nutritional Science

Background:

Premature hair graying (PHG) is defined by the appearance of gray hairs before age 20 (fair skin), 25 (Asians), or 30 (Africans).
Potential genetic and environmental factors, including autoimmune conditions, are implicated in PHG.

Purpose of the Study:

To investigate serum levels of key minerals: iron, copper, and calcium.
To determine the association between these mineral levels and the occurrence and severity of premature hair graying.

Main Methods:

A case-control study involving 60 patients with PHG and 30 healthy controls.
Serum iron, copper, and calcium levels were quantified using spectrophotometry.
The severity of PHG was evaluated using a standardized hair whitening scoring system.

Main Results:

Patients with PHG exhibited significantly lower serum concentrations of iron, copper, and calcium compared to controls.
A statistically significant negative correlation was observed between PHG severity and serum levels of iron and calcium.
No significant correlation was found between body mass index and serum levels of these minerals.

Conclusions:

Reduced serum iron, copper, and calcium levels are associated with premature hair graying and its severity.
PHG may indicate inadequate nutrient and mineral intake, highlighting the potential of supplementation.
Further research is warranted to elucidate the precise mechanisms underlying this relationship.