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GlossaryPolydispersity Index (PDI)

measure of molecular size distribution in a polymer sample

The Polydispersity Index (PDI) is a measure of the distribution of molecular mass in a given polymer sample. It indicates how uniform or varied the sizes of the molecules are within the sample. A PDI value close to 1 suggests a uniform molecular size, while higher values indicate a broader range of molecular sizes. This term is particularly important in fields like materials science and biochemistry, where the consistency of molecular size can impact the properties and behavior of materials or biological molecules.

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research Protein Disulfide Isomerase-Mediated Grafting of Cysteine-Containing Peptides onto Over-Bleached Hair

28 citations , December 2011 in “Biocatalysis and biotransformation”

PDI helps restore over-bleached hair's strength and structure by attaching special peptides.

Premature Desquamation of the Inner Root Sheath in Noninflamed Hair Follicles as a Specific Marker for Central Centrifugal Cicatricial Alopecia

research Premature Desquamation of the Inner Root Sheath in Noninflamed Hair Follicles as a Specific Marker for Central Centrifugal Cicatricial Alopecia

6 citations , December 2018 in “The American Journal of Dermatopathology”

Early shedding of the inner root sheath in noninflamed hair follicles is a relatively specific sign of Central Centrifugal Cicatricial Alopecia.

research Is Androgenetic Alopecia a Marker of Arrhythmia? A Case-Control Study

September 2025 in “Medicine”

Men with androgenetic alopecia may have a higher risk of heart rhythm problems.

research Topical Delivery of Fenugreek Seed Extract Loaded Solid Lipid Nanoparticles Based Hydrogels for Alopecia

2 citations , August 2021 in “Journal of pharmaceutical research international”

Fenugreek seed extract in a nanoparticle gel could be a promising new treatment for hair loss.

research Approaching Erectile Dysfunction in Dermatology Patients

1 citations , July 2013 in “JAMA Dermatology”

Dermatologists should address erectile dysfunction in patients with skin conditions to improve their quality of life.

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community Let Me Sell You on NAC

14 upvotes 6 years ago

The conversation discusses using NAC (N-Acetyl Cysteine) alongside minoxidil and finasteride for hair loss, with some users noting potential hairline improvement and increased energy. The original poster reduced their finasteride dosage due to mental decline and anxiety, and while NAC's effects on hair are anecdotal, it is considered low-risk with other health benefits.

community New and Interesting HairLoss Studies/Papers/Reviews

in Treatment 42 upvotes 5 years ago

Hair loss treatments discussed include Dutasteride with Ketoconazole, tissue engineering strategies, and androgenetic alopecia therapies. Massage doubles follicular retention, improving treatment effectiveness.