RESUMEN
Although pubic hair has been a subject of public interest, little is known about its structure or characteristics beyond its curly and coarse appearance. In this study, we investigated the surface and internal features of pubic hair from Korean males and compared them to those of scalp hair from the same donors. Our findings indicate that the cuticle layer of pubic hair has a greater number of scales than that of scalp hair, resulting in a thicker cuticle layer overall. Fourier-transform infrared (FT-IR) spectroscopy analysis showed that the protein in the cortex layer of pubic hair was less affected by exposure to urine or ammonia than the protein in the cortex layer of scalp hair. This suggests that the cuticle layer of pubic hair, which is thicker and composed of more scales, acts as a physical barrier that protects the hair's internal structure. Furthermore, we observed that the secondary and tertiary structures of keratin in the pubic hair cuticle layer are essentially different from those in scalp hair. Based on these findings, we hypothesize that the thickened cuticle layer in pubic hair may have evolved as a defence mechanism against chemical damage from urine, urea and ammonia.
Asunto(s)
Amoníaco , Cuero Cabelludo , Masculino , Humanos , Espectroscopía Infrarroja por Transformada de Fourier , Amoníaco/análisis , Amoníaco/metabolismo , Cabello/metabolismo , Queratinas/metabolismoRESUMEN
BACKGROUND: Local administration of opioids causes effective analgesia without adverse effects related to the central nervous system. After the beneficial demonstration of peripheral opioid receptors in joint synovia, intra-articular opioid injections were used for pain treatment. Clinical studies have reported the safety and efficacy of hyaluronate injection in the shoulder joint of patients with osteoarthritis, periarthritis, rotator cuff tears, and adhesive capsulitis. OBJECTIVES: To estimate the efficacy of intra-articular hyaluronate and tramadol injection for adhesive capsulitis of the shoulder compared with that of intra-articular hyaluronate injection alone. METHODS: Thirty patients with adhesive capsulitis of the shoulder were randomized to the hyaluronate group (n= 16) or the tramadol group (n= 14). Hyaluronate group members were administered five weekly intra-articular hyaluronate injections; tramadol group members were administered three weekly intra-articular hyaluronate and tramadol injections and then two weekly intra-articular injections of hyaluronate. Visual Analog Scale (VAS), passive range of motion (PROM) of the shoulder joint, and Shoulder Pain and Disability Index (SPADI) scores were assessed at baseline and weeks 1, 2, 3, 4, and 6 after the initial injection. RESULTS: A significant improvement was observed in VAS, PROM, and SPADI scores between time points in both groups. In comparison in both groups at weeks 1 and 2 after the initial injection the VAS scores of the tramadol group were significantly lower than those of the hyaluronate group. CONCLUSIONS: Intra-articular hyaluronate with tramadol showed more rapid and strong analgesic effects than intra-articular hyaluronate alone and did not induce any adverse effects.