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hair related research references ||
testosterone related research references ||
melanin related research references ||
nicotine related research references
Biochem Soc Trans. 2003 Aug;31(Pt 4):851-6.
Red, yellow, green go!--A novel tool for microscopic segregation of secretory vesicle pools according to their age.
Wiegand UK, Duncan RR, Greaves J, Chow RH, Shipston MJ, Apps DK.
Membrane Biology Group, University of Edinburgh, George Square, Edinburgh EH8 9XD, Scotland, UK. uwiegantaffmail.ed.ac.uk
Large dense-core vesicles (LDCVs) were labelled in cultured bovine adrenal chromaffin cells expressing fluorescent chimaeric 'cargo' proteins that were targeted to these secretory vesicles. When the cells were stimulated with nicotine 48 h after transduction, the fractional loss of fluorescent LDCVs was much greater than the fractional catecholamine secretion, implying selective release of newly assembled vesicles. This was confirmed using a fluorescent 'timer' construct that changes its fluorescence emission from green to red over several hours, and by measurement of the location and mobility of LDCVs in live cells by confocal fluorescence microscopy. Newly assembled (green) LDCVs were located mostly in peripheral regions of the cells, were virtually immobile and could be released by nicotine, but not by Ba2+; in contrast, older (red) LDCVs were centrally located and relatively mobile, and their exocytotic release was triggered by Ba2+, but not by nicotine. We describe the image restoration procedure that is necessary in order to analyse the behaviour of LDCVs labelled with this construct.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12887320&dopt=Abstract [PubMed - in process]
Eur J Oral Sci. 2003 Aug;111(4):312-5.
The permeability of oral leukoplakia.
Banoczy J, Squier CA, Kremer M, Wertz PW, Kovesi G, Szende B, Dombi C.
Department of Oral Biology, Faculty of Dentistry, Semmelweis University Budapest Hungary. banoczet.sote.hu
The significant increase in oral cancer mortality necessitates further research on the mechanisms of tumorigenesis. It was the aim of this study to compare the permeability, lipid composition and histopathological characteristics of oral leukoplakia with non-lesional specimens of the same region in 30 cases as well as 11 specimens originating from healthy control buccal mucosa. The permeability (Kp) of tissue biopsies to tritiated nitrosonornicotine was determined in a continuous through-flow perfusion system, lipids were extracted and identified by thin-layer chromatography, and thickness of epithelium and keratin layer assessed by histopathological methods. Results of the measurements showed that the permeability to the tobacco carcinogen, nitrosonornicotine for leukoplakic tissue was higher than for normal control buccal specimens. Non-lesional areas of buccal mucosa, adjacent to leukoplakias, showed hyperplasia and significantly higher permeability values than both leukoplakic and normal buccal control mucosa. The lipid content of the non-lesional sites was intermediate between the increased values of the leukoplakic lesion and of normal control mucosa. The data strongly suggest that the presence of tobacco in the oral cavity may bring about generalized changes even in regions that do not show leukoplakia.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12887396&dopt=Abstract [PubMed - in process]
Neuropharmacology. 1999 Apr;38(4):587-95.
Prolonged effects of chronic ethanol treatment on responses to repeated nicotine administration: interactions with environmental cues.
Watson WP, Little HJ.
Psychology Department, Durham University, UK.
The most common combination of dependence on two drugs occurs with alcohol and nicotine, but little is known of the way in which these drugs interact in the brain. This study investigated the effects in mice of prolonged consumption of alcohol, by liquid diet, on the actions of nicotine on locomotor activity, and the influence of environmental cues on these effects. Administration of nicotine after chronic alcohol intake did not show any significant changes on first administration, but after 28 days of daily nicotine injections, nicotine produced significant locomotor stimulation and increased rearing activity in the mice which had previously received the alcohol diet, compared with the activity of animals that received the control diet. However, significantly increased locomotor activity was also seen, after the repeated nicotine administration, immediately prior to the nicotine injection, only in the mice that had previously consumed alcohol. Examination of the influence of the environment in which the activity was tested demonstrated that the effect on activity prior to injections was seen only if measurement was made in a test environment that was familiar to the animals. The results demonstrate an interaction between chronic alcohol consumption and the effects of environment on the actions of nicotine, that may have relevance to the consumption of these drugs in humans.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10221762&dopt=Abstract
Hair loss is a problem in modern soceity. Examining the factors of hair growth may
shed light on how hair loss might occur.
How long can hair grow before it stops growing eventually if it does?
Given that the hair growth rate is quite uniform and constant, somewhere between 0.3-0.5 millimeters per day, it's believed that the length of anagen, the growth phase, differs among individuals, and this is the major determinant to the maximum hair length. For some individuals, anagen may last ten years. Of course the length of the anagen is governed by genes, and the genetic background of the individuals. Non-genetic factors such as nutritional condition, weather, seasonal changes (hair may grow a bit faster during winter), taking medications, health condition may of course influence the rate of
hair growth as well as
hair loss.
The shape of the hair, straight or curly, is dependent on the shape of the follicle. A circular or round hair follicle would generate straight hair, while the follicle with oval or elliptical shapes (in its cross-section) would produce a curly hair.
DHEA is a natural hormone, and it is produced in our body by the adrenal glands.
DHEA has been suggested to provide numerous potential benefits. DHEA (or dehydroepiandrosterone) is converted into androgens (male hormones)
or estrogens (female hormones) in the cells.
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