scholarly journals The Development and Application of the Hair Diameter Index (HDI)

2021 ◽  
Vol 31 (1) ◽  
pp. 1-8
Author(s):  
James A. Harris
Keyword(s):  
Hair Diameter

Scalp hair diameter increases during pregnancy

2003 ◽  
Vol 28 (5) ◽  
pp. 525-530 ◽  
Author(s):  
J. Nissimov ◽  
U. Elchalal
Keyword(s):  
Scalp Hair ◽  
Hair Diameter

Changes of Hair Diameter after Treatment of Androgenic Alopecia; the First Case-control Study

2014 ◽  
Vol 14 (2) ◽  
pp. 97-100
Author(s):  
Effat Khodaeiani ◽  
Shahla Babaeinejad . ◽  
Mahsa Jamshidi Asl . ◽  
Elham Razzagh Karimi . ◽  
Daniel F. Fouladi . ◽  
...  
Keyword(s):  
Case Control Study ◽  
Case Control ◽  
Androgenic Alopecia ◽  
First Case ◽  
Control Study ◽  
Hair Diameter

scholarly journals Comparison of finasteride versus flutamide in the treatment of hirsutism

1999 ◽  
pp. 361-367 ◽  
Author(s):  
L Falsetti ◽  
A Gambera ◽  
L Legrenzi ◽  
C Iacobello ◽  
G Bugari
Keyword(s):  
Side Effects ◽  
Polycystic Ovary ◽  
Randomized Study ◽  
Dry Skin ◽  
Ovary Syndrome ◽  
Once Daily ◽  
Idiopathic Hirsutism ◽  
Androstanediol Glucuronide ◽  
To Receive ◽  
Hair Diameter

OBJECTIVE: To compare the effectiveness of finasteride and flutamide in the treatment of hirsutism in patients with polycystic ovary syndrome (PCOS) and with idiopathic hirsutism. DESIGN: Randomized study. PATIENTS: One hundred and ten hirsute patients were selected: 64 women with PCOS and 46 with idiopathic hirsutism. METHODS: Patients were assigned randomly to receive 5mg finasteride once daily or 250mg of flutamide twice daily, for 12 consecutive months. Hirsutism was evaluated at 12 months of therapy, with the Ferriman-Gallwey score and with measurement of the terminal hair diameters (microm) taken from four different body areas. Blood samples were taken for assessment of endocrine and hematochemical parameters. Side effects were monitored during the treatment. RESULTS: Both finasteride and flutamide induced a significant decrease in the hirsutism scores and hair diameters at the end of 12 months. Finasteride reduced the Ferriman-Gallwey score by 31.4% in the PCOS cases and by 34.2% in the idiopathic hirsutism cases, and hair diameter by 27.0-34.1% in PCOS and by 29.6-37.9% in idiopathic hirsutism. Flutamide reduced the Ferriman-Gallwey score by 56.7% in PCOS and by 50.9% in idiopathic hirsutism, and hair diameter by 50. 3-60.0% in PCOS and by 47.7-56.5% in idiopathic hirsutism. Flutamide did not induce hormone variations, while finasteride increased testosterone levels by 40% in PCOS and by 60% in idiopathic hirsutism and decreased 3alpha-androstanediol glucuronide (3alpha-diolG) by 66.7% in PCOS and by 69.5% in idiopathic hirsutism. No important side effects or changes in the hematochemical parameters were observed with finasteride, while two patients (3.6%) in the flutamide group expressed abnormal transaminase levels after 6 months of treatment. Dry skin also appeared significantly more with flutamide (67.3%) than with finasteride (23.6%). CONCLUSIONS: Both drugs are effective in the treatment of hirsutism but flutamide is more effective than finasteride.

scholarly journals Variation and Heritability in Hair Diameter and Curvature in an Australian Twin Sample

2016 ◽  
Vol 19 (4) ◽  
pp. 351-358 ◽  
Author(s):  
Yvonne Y. W. Ho ◽  
Mark Brims ◽  
Dennis McNevin ◽  
Timothy D. Spector ◽  
Nicholas G. Martin ◽  
...  
Keyword(s):  
Structural Equation ◽  
Genetic Factors ◽  
Fiber Diameter ◽  
Scalp Hair ◽  
Genetic Correlations ◽  
Equation Modeling ◽  
Environmental Correlations ◽  
Sex Limitation ◽  
Objectively Measured ◽  
Hair Diameter

Hair diameter and curvature are two characteristics of human scalp hair used in forensic contexts. While previous data show that subjective categorization of hair curvature is highly heritable, the heritability of objectively measured curvature and diameter, and variability of hair characteristics within each individual have not yet been studied. The present study measured hair diameter and curvature using an optical fiber diameter analyzer in a sample of 2,332 twins and siblings. Heritability was estimated using maximum likelihood structural equation modeling. Results show sex differences in the magnitude of genetic influence for mean diameter and curvature, with the vast majority of the variance accounted for by genetic effects in males (diameter = 86%, curvature = 53%) and females (diameter = 77%, curvature = 61%). The consistency of diameter (variance within an individual) was also highly heritable, but did not show sex limitation, with 68% of the variance accounted for by genetic factors. Moderate phenotypic correlations were seen between diameter and consistency (r = 0.3) but there was little correlation between diameter and curvature (r = -0.13). A bivariate Cholesky analysis was used to estimate the genetic and environmental correlations between hair diameter and consistency, yielding genetic correlations of rgF = 0.27 for females and rgM = 0.25 for males.

EFFECTS OF EPIDERMAL GROWTH FACTOR ON HAIR GROWTH IN THE MOUSE

1981 ◽  
Vol 88 (2) ◽  
pp. 293-299 ◽  
Author(s):  
G. P. M. MOORE ◽  
B. A. PANARETTO ◽  
D. ROBERTSON
Keyword(s):  
Growth Rate ◽  
Growth Factor ◽  
Epidermal Growth Factor ◽  
Hair Growth ◽  
Male Mice ◽  
Hair Coat ◽  
Body Weights ◽  
Epidermal Growth ◽  
Similar Body ◽  
Hair Diameter

The growth of the first hair coat in male mice was studied during administration of epidermal growth factor (EGF). Injections of 1 or 4 μg EGF/g body weight for 14 consecutive days from birth resulted in the development of curved overhairs (monotrichs), caused a retardation in rate of growth in length of hair and a reduction in hair diameter and length of follicle bulb. Growth rate partially recovered after cessation of EGF treatment. However, some of the effects produced by injections of EGF during the formation of the first coat were detected in the second and third generations of hair. Since EGF also retarded rate of body growth, we compared the effect of EGF on hair growth with that of restricting food intake in neonatal mice during the development of the first coat. Hair growth was slowed in underfed animals but the effects were less marked than those found in EGF-treated mice of similar body weights.

Variation in hair characters over the body in Sahiwal Zebu and Jersey cattle

1964 ◽  
Vol 15 (2) ◽  
pp. 346 ◽  
Author(s):  
YS Pan
Keyword(s):  
Diameter Ratio ◽  
The Body ◽  
Single Sample ◽  
Hair Length ◽  
Jersey Cattle ◽  
Coefficients Of Variation ◽  
General Variation ◽  
The Mean ◽  
Hair Diameter

In both Sahiwals and Jerseys, mean hair length and diameter increased posteriorly. The length/diameter ratio, and diameters of non-medullated hairs, of medullated hairs, and of the medulla itself also varied between positions, as did the percentage of medullated hairs. Jerseys had greater hair length than Sahiwals at all positions (average + 80%) though in the majority of positions Sahiwals had a greater hair diameter than Jerseys (average + 12%). Coefficients of variation in hair length were similar for the two breeds. In general, variation of hair diameter within positions was slightly greater in Sahiwals, but differences between positions in the variability of hair diameter were small. In all positions, Jerseys had greater hair length/diameter ratios than Sahiwals (average + 90%). In the majority of positions, Jerseys had a greater percentage of medullated hairs than Sahiwals. The mean percentage of medullated hairs for Jerseys was 88% and for Sahiwals 85%, whilst the mean diameters of both medulla and medullated hairs were greater in Sahiwals (39.4 and 62 1 µ) than in Jerseys (26.7 and 54.2 µ). Diameters of non-medullated hairs differed little between the two breeds, being 44.40 µ for Sahiwals and 40.82 µ for Jerseys. Only differences between the two breeds in hair length, hair length/diameter ratio, and medulla diameter were statistically significant. The percentage of medullated fibres was the only character for which the commonly used midside sample provided estimates which were within 10% of the mean over all positions for each breed. Estimates of means and coefficients of variation for other characters are likely to be misleading if based on a single sample from this region. Positions providing better estimates for other traits are: mean hair length in Sahiwals, position 2; C.V. of mean hair length in Jerseys, position 12; mean hair diameter in Sahiwals, position 4; C.V. of mean hair diameter in Jerseys, position 4; mean hair length/diameter ratio in Sahiwals, position 8.

Penicillium bilaii inoculation increases root-hair production in field pea

2000 ◽  
Vol 80 (4) ◽  
pp. 801-804 ◽  
Author(s):  
Robert H. Gulden ◽  
J. Kevin Vessey
Keyword(s):  
Pisum Sativum ◽  
Root Hair ◽  
Root Morphology ◽  
Shoot Growth ◽  
Root Hairs ◽  
Root Diameter ◽  
Hair Length ◽  
P Accumulation ◽  
The Mean ◽  
Hair Diameter

Under three levels of phosphorus availability, inoculation of pea plants with Penicillium bilaii in growth pouches had no effect on root length (excluding root hairs), mean root diameter, root-hair diameter, P accumulation or shoot growth. However, inoculation with P. bilaii resulted in a 22% increase in the proportion of root containing root hairs and a 33% increase in the mean root-hair length. Key words: Pea, Penicillium bilaii, Pisum sativum, phosphorus, root hairs, root morphology

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