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hair related research references ||
testosterone related research references ||
melanin related research references
J Clin Microbiol. 1978 Aug;8(2):123-6.
Preparation of prereduced anaerobically sterilized media and their use in cultivation of anaerobic bacteria.
Chan EC, deVries J, Harvey RF.
Several modifications of the roll-tube method have made it simpler for routine use in the isolation and growth of anaerobic bacteria. These include use of a check valve for the production of prereduced anaerobically sterilized media; a Salvarsan tube under oxygen-free gas pressure for the dispensing of molten prereduced anaerobically sterilized agar medium; a Kelly infusion bottle with a graduated pipette side arm (also under gas pressure) for quantitative delivery of fluid prereduced anaerobically sterilized media; and screw-capped prescription bottles for the cultivation of anaerobes. Colonies of Bacteroides melaninogenicus were easily identified and counted by this method. Other anaerobic bacteria have also been cultivated successfully.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=29909&dopt=Abstract
Dermatol Surg. 1999 Feb;25(2):121-3.
Erbium:YAG laser resurfacing for refractory melasma.
Manaloto RM, Alster T.
Washington Institute of Dermatologic Laser Surgery, Washington, DC, USA.
BACKGROUND: Melasma is a facial dyspigmentation which is a common complaint in patients with darker skin tones. Many current therapies used for this condition are ineffective and can cause significant adverse effects. OBJECTIVE: The purpose of this study was to evaluate the role of erbium:YAG laser resurfacing in the management of refractory melasma. METHODS: Ten female patients with melasma unresponsive to previous therapy of bleaching creams and chemical peels were included in this study. Full face skin resurfacing using an erbium: YAG laser (2.94 microm) was performed using 5.1-7.6 J/cm2 energy. Clinical evaluations using the Melasma Area and Severity Index (MASI) and melanin reflectance spectrometry measurements were taken preoperatively and at 0.5, 1, 1.5, 3, and 6 weeks and 3, 5, and 6 months postoperatively. Adverse effects after laser resurfacing such as prolonged erythema, infection, and hyperpigmentation were recorded. RESULTS: There was marked improvement of the melasma immediately after laser surgery using the parameters outlined; however, between 3 and 6 weeks postoperatively, all patients exhibited post-inflammatory hyperpigmentation. Decreased MASI and melanin reflectance spectrometry measurement scores were noted after biweekly glycolic acid peels and at the end of 6 months, significant clinical improvement in the melasma was seen compared to the preoperative evaluation. CONCLUSION: Erbium:YAG laser resurfacing effectively improves melasma; however, the almost universal appearance of transient post-inflammatory hyperpigmentation necessitates prompt and persistent intervention. The use of this laser therapy is recommended only for refractory melasma.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10037517&dopt=Abstract
Cell. 1978 Nov;15(3):843-54.
Phenotypic exclusion in mouse melanoma-rat hepatoma hybrid cells: pigment and albumin production are not reexpressed simultaneously.
Fougere C, Weiss MC.
Hybridization of cells of defined and different histotypes has been carried out to investigate whether the expression (or reexpression) of parental functions is mutually exclusive, as is expected if the generally assumed rule of discreteness of differentiation applies to hybrid cells. A cross of pigmented mouse melanoma cells and albumin-producing rat hepatoma cells gave rise to hybrids containing essentially one set of chromosomes from each parent and producing neither melanin nor albumin. Cells of one hybrid clone are shown to retain the potential to reexpress both parental differentiations. Successive subclonings of this hybrid have shown that cells which reexpress one function may retain the potential to reexpress the other, and that freshly isolated, morphologically homogeneous subclones may produce pigment or albumin, but not both; there successive and exclusive shifts of phenotype are documented, and in these cases, chromosome loss is very slight. The use of immunoadsorbed antisera has revealed that most (if not all) of the albumin produced by the hybrid cells is of the mouse type. We conclude that both parental determinations are retained by the hybrid cells, and that the parental differentiations are reexpressed only in a mutually exclusive fashion.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=31979&dopt=Abstract
The average human scalp is covered by approximatey 100,000 hair follicles. Each hair undergoes
hair cycle and normally 50-100 hairs randomly fall out a day, which is unnoticeable because lost hair is replaced by as many new hairs springing up daily. Hair loss results from the fall out of hair from the hair follicle. Alopecia or excessive, premature hair loss is the condition caused by many factors.
Loss of hair itself does not pose critical health problems because biological role of human hair is relatively marginal. Hair on our scalp protects the head from mechanical shock, heat loss, and exposure to UV-light. The eyelashes and eyebrowes protect the eyes, and hair in the ear canal or the nasal passages help filter out particles and pathogens, thus protecting our internal organs.
However, hair does play important social role: it is one of the major determinants of our appearance and identity in daily life. Fullness of hair also implicates or manifests physical integrity and youthfulness of the person. Losing hair could have more than just emotional impacts on individuals.
The hair is a unique organ that goes through a characteristic cycle consisting of an immature phase, a growing phase called anagen, a transitional phase between the growing phase and the resting phase called catagen, and finally a resting phase called telogen in which the hair stops growing, waiting to fall out. 85-90% of hairs on our body are in anagen phase or growing phase, which lasts anywhere from two to five years. This phase is followed by a short regression phase, or catagen, which lasts 2-3 weeks. Approximately 1% of hair follicles are in catagen. Approximately 10-15% of hair follicles are in the resting phase, the telogen, which lasts about 3-5 months. Hair follicles typically goes through 10-20 asynchronous cycles during the lifetime.
Persistent loss of more than 150 hairs would consist a state of hair loss, or alopecia, albeit it could be temporary.
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