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hair related research references ||
testosterone related research references ||
melanin related research references ||
nicotine related research references
Jpn J Pharmacol. 1977 Feb;27(1):55-63.
Descending release of acetylcholine from the locally distended guinea pig ileum.
Takewaki T, Yagasaki O, Yanagiya I.
The effects of local distension of the intestinal wall on the release of acetylcholine (ACh) from the adjacent non-distended part were studied with the segment os isolated guinea pig ileum. Local distension of the intestinal wall induced the increased release of ACh in the distended part and in its anal side but not in its oral side. Such aboral release of ACh by local distension was abolished by tetrodotoxin or atropine in the concentrations which did not block the release in the distended part. When hexamethonium was applied exclusively to the distending part, significant increase of ACh release was observed in both the regions oral to and anal to the distended part. It is suggested that distension stimuli applied to the myenteric plexus are transmitted aborally along the network of the Auerbach's plexus to the anal direction. The release of ACh from the intestine by nicotine or DMPP differed from the occurring during local distension in that the release was localized to the part of the intestine to which the drug was applied.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=17026&dopt=Abstract
Br J Pharmacol. 1977 May;60(1):59-64.
Development of nicotinic responses in the rat adrenal medulla and long-term effects of neonatal nicotine administration.
Rosenthal RN, Slotkin TA.
1. The development of nicotinic responses in the rat adrenal medulla was examined at various ages from 1 to 50 days of age by testing the ability of nicotine (10 mg/kg, s.c.) to deplete catecholamines and induce tyrosine hydroxylase. 2. Catecholamines were depleted 25% 3 h after injection of nicotine at all ages tested, but the degree of tyrosine hydroxylase induction 24 h after nicotine increased with age. 3. These data indicate that functional nicotinic receptors are present in the neonatal adrenal medulla before the development of functional splanchnic innervation, but that the development of the ability to induce tyrosine hydroxylase is not coupled directly to the development of secretory mechanisms. 4. The long-term effects of a single dose of nicotine (10 mg/kg, s.c.) administered to one day old rats were also examined. 5. After the short-term catecholamine depletion caused by nicotine, there were persistent elevations of catecholamines and tyrosine hydroxylase until 23 days of age; however, dopamine beta-hydroxylase remained elevated into young adulthood. 6. These data indicate that neonatal nicotine administration can produce long-term changes in adrenal catecholamine biosynthetic enzymes.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=18246&dopt=Abstract
Drug Metab Dispos. 1977 Jul-Aug;5(4):355-62.
The interrelationship between the metabolism of (S)-continine-N-oxide and (S)-cotinine.
Yi JM, Sprouse CT, Bowman ER, McKennis H Jr.
The metabolism of (S)-cotinine-N-oxide was studied in the rabbit and the dog. The pattern of Koenig-positive substances in the urine of the animals suggested the presence of cotinine, demethylcotinine, hydroxycotinine, and allohydroxycotinine, compounds already previously identified as metabolites of (S)-cotinine and (S)-nicotine in many mammalian species. In the dog, 34% of the administered oral dose of (S)-cotinine-N-oxide was recovered from the urine, and 21% was recovered from the urine of the rabbit. Confirmation of the presence of (S)-cotinine, (S)-demethulcotinine, hydroxycotinine, and allohydroxycotinine in the urine of the rabbits was obtained by isolation of the metabolites as themselves of as derivatives. The data, although establishing the possibilities of an intermediary role for (S)-cotinine-N-oxide in the metabolism of nicotine, do not clearly indicate whether the metabolites such as demethylcotinine arise via the route (S)-cotinine-N-oxide leads to (S)-cotinine leads to (S)-demethylcotinine or via the alternate route (S)-cotinine-N-oxide leads to (S)-demethylcotinine-N-oxide leads to (S)-demethylcotinine.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=19214&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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