scholarly journals Straight to the Point: What Do We Know So Far on Hair Straightening?

2021 ◽  
pp. 1-7
Author(s):  
Taynara Barreto ◽  
Flavia Weffort ◽  
Simone Frattini ◽  
Giselle Pinto ◽  
Patricia Damasco ◽  
...  
Keyword(s):  
Human Hair ◽  
Literature Search ◽  
Straight Hair ◽  
Hair Shafts ◽  
Methods Of Application

<b><i>Background:</i></b> Hair represents a valued aspect of human individuality. The possibility of having an easy to handle hairstyle and changing it from time to time promoted an increasing search for chemical hair transformations, including hair straightening. Hair straightening is the process used to convert curly into straight hair. <b><i>Aims:</i></b> This review aims to discuss hair straightening, addressing techniques, products, methods of application, consequences to hair shafts, recommendations on this topic, and the risks involving the safety of both the user and the performing professional. <b><i>Methods and Results:</i></b> The terms “straightening” AND “hair,” “straightening” AND “alopecia,” and “straightening” AND “human hair” were used to perform a literature search in MEDLINE through PubMed until July 15, 2020. We limited the search to articles available in English, considering those mentioning alternatives to straighten the hair. We had a total of 33 relevant articles. <b><i>Conclusions:</i></b> This article will help dermatologists to advise their patients, providing a more suitable orientation on how to get the best outcome without risking one’s safety.

scholarly journals Identification of Antibacterial Components in Human Hair Shafts

2018 ◽  
Vol 98 (7) ◽  
pp. 708-710 ◽  
Author(s):  
R Subbaiah ◽  
S Kerk ◽  
Y Lian ◽  
D Lunny ◽  
S Sze ◽  
...  
Keyword(s):  
Human Hair ◽  
Hair Shafts

Facile and Efficient Enzymatic Methods for Harvesting or Removal of Cuticle Cells from Human Hair Shafts

2021 ◽  
pp. 1-14
Author(s):  
Nan Zhang ◽  
Huiying Lai ◽  
Archana Gautam ◽  
Zhitong Zhao ◽  
Qiang Wang ◽  
...  
Keyword(s):  
Human Hair ◽  
Hair Shafts ◽  
Enzymatic Methods

scholarly journals INTRODUCING GAP IN HAIR FOLLICLE ELECTROMAGNETISM AS MECHANISM FOR THE PRESENCE OF BIPOLAR ELECTRICAL CHARGES INHERENT IN THE HUMAN HAIR SHAFT

2021 ◽  
Vol 9 (9) ◽  
pp. 79-87
Author(s):  
Abraham A. Embi
Keyword(s):  
Magnetic Field ◽  
Electrical Property ◽  
Human Hair ◽  
Negative Charge ◽  
Hair Shaft ◽  
Hair Follicles ◽  
Cell Divisions ◽  
Positive Side ◽  
Microscopy Method ◽  
Hair Shafts

The human hair consists of a follicle anchored in the skin and a protruding shaft, it has also been described as a miniorgan, having its own cell divisions, metabolism, and known to undergo aging stages; eventually reaching a point where the old hair sheds and a new hair growing cycle begins from the same follicular tissue. Using sophisticated magnetometers, magnetic field emitted by direct current (DC) in human hair follicles were detected and introduced in 1980. Most recently in 2015, a tabletop optical microscopy method was developed and published in 2016, thus allowing for the detection of hair follicles and shaft magnetic fields. Qualitative images are presented where the bipolar electrical property of the shaft is documented. This finding was inferred since blood tissue carries a negative charge, thus repelled by an equal charge; experiments support a positive (+) field as triggering coagulation. The shaft is repeatedly shown in experiments to express a contralateral positive side triggering. Fibrin formation is also documented by images showing intricate networks indicative of blood coagulation. In conclusion, the genesis of hair shafts bipolarity is shown resulting from a “gap” in the follicle electromagnetic fields inhibiting energy from fully engulfing the shaft.

scholarly journals Alternative LC–MS/MS Platforms and Data Acquisition Strategies for Proteomic Genotyping of Human Hair Shafts

2021 ◽  
Author(s):  
Zachary C. Goecker ◽  
Kevin M. Legg ◽  
Michelle R. Salemi ◽  
Anthony W. Herren ◽  
Brett S. Phinney ◽  
...  
Keyword(s):  
Data Acquisition ◽  
Human Hair ◽  
Acquisition Strategies ◽  
Hair Shafts

Hair Loss in Children

1981 ◽  
Vol 3 (3) ◽  
pp. 85-90
Author(s):  
James E. Rasmussen
Keyword(s):  
Cross Section ◽  
Hair Loss ◽  
Human Hair ◽  
Shape Change ◽  
Hair Color ◽  
Random Pattern ◽  
Active Growth ◽  
Anagen Phase ◽  
Straight Hair ◽  
Histologic Changes

PHYSIOLOGY OF NORMAL HAIR1,2 Unlike the hair of most animals, human hair usually follows a random pattern of growth, rest, and shedding, followed by the growth and emergence of a new hair from the follicle. This cycle is related to histologic changes in the follicle: The anagen phase involves active growth (long follicle); the telogen phase is resting (short follicle); and the catagen phase is a transition between anagen and telogen. The duration of the growing phase (anagen) determines the ultimate length of the hair: normally longest on the scalp, followed in descending order of length by the hairs of the beard, pubis, axillae, body, eyebrows, and eyelid margins. Longer hair is associated with a higher ratio (10:1) of anagen to telogen follicles. Hair plucking is the most rapid, convenient path to examine this relationship: anagen hairs have a glistening, cylindrical proximal sheath, approximately 3 mm long (Fig 1) whereas the telogen follicle yields a hair with a short, 1-mm knob, appropriately called a club (Fig 2). The shape and color of hair are usually determined genetically. Straight hair is round in cross section, with curly and kinky (spiral) varieties becoming progressively more ellipsoid. Hair color may normally darken and shape change for the first five to ten years of life; this tendency is most commonly seen in the transformation of a curly haired blond child into a tow-headed or brunette adolescent.

scholarly journals Quantitative mapping of human hair greying and reversal in relation to life stress

eLife ◽  
2021 ◽  
Vol 10 ◽  
Author(s):  
Ayelet M Rosenberg ◽  
Shannon Rausser ◽  
Junting Ren ◽  
Eugene V Mosharov ◽  
Gabriel Sturm ◽  
...  
Keyword(s):  
Human Hair ◽  
Life Stress ◽  
Computational Simulation ◽  
Antioxidant Defenses ◽  
Human Biology ◽  
Body Regions ◽  
Quantitative Mapping ◽  
Psychological Stressors ◽  
Hair Shafts ◽  
Individual Human

Background:Hair greying is a hallmark of aging generally believed to be irreversible and linked to psychological stress.Methods:Here, we develop an approach to profile hair pigmentation patterns (HPPs) along individual human hair shafts, producing quantifiable physical timescales of rapid greying transitions.Results:Using this method, we show white/grey hairs that naturally regain pigmentation across sex, ethnicities, ages, and body regions, thereby quantitatively defining the reversibility of greying in humans. Molecularly, grey hairs upregulate proteins related to energy metabolism, mitochondria, and antioxidant defenses. Combining HPP profiling and proteomics on single hairs, we also report hair greying and reversal that can occur in parallel with psychological stressors. To generalize these observations, we develop a computational simulation, which suggests a threshold-based mechanism for the temporary reversibility of greying.Conclusions:Overall, this new method to quantitatively map recent life history in HPPs provides an opportunity to longitudinally examine the influence of recent life exposures on human biology.Funding:This work was supported by the Wharton Fund and NIH grants GM119793, MH119336, and AG066828 (MP).

Sign in / Sign up

Export Citation Format

Share Document