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Interferon research abs 1 || Hemoglobin research abs || Stem cell research abs || Nucleic acid research abs || Herpes research abs || Bronchitis research abs || Schizophrenia research abs || Tuberculosis research abs || Pneumonia research abs || Constipation research abs || Laxative research abs || hair research abs || hair related research references || testosterone related research references || melanin related research references

Photochem Photobiol. 2003 Jan;77(1):1-4.
Ultrafast energy transfer from bound tetra(4-N,N,N,N-trimethylanilinium)porphyrin to synthetic dopa and cysteinyldopa melanins.

Ye T, Simon JD, Sarna T.

Department of Chemistry, Duke University, Durham, NC 27708-0346, USA.

The binding of tetra(4-N,N,N,N-trimethylanilinium)porphyrin (TAP) to melanins quenches the porphyrin emission. Time-resolved femtosecond absorption spectroscopy reveals that the mechanism behind this quenching is ultrafast nonradiative energy transfer ((tau)ET < 100 fs) from electronically excited TAP to melanin. Similar dynamics are observed for both dopa and cysteinyldopa melanins. Steady-state emission studies demonstrate that the emission from melanin increases upon excitation of bound TAP, thereby confirming that rapid energy transfer occurs. These results are consistent with previous photoacoustic studies, which revealed that the TAP-melanin complex behaves like a supermolecular system liberating heat as a whole.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12856874&dopt=Abstract [PubMed - in process]

J Neurosci. 1999 May 15;19(10):RC5.
Neurochemical characterization of hypothalamic cocaine- amphetamine-regulated transcript neurons.

Vrang N, Larsen PJ, Clausen JT, Kristensen P.

Department of Medical Anatomy, University of Copenhagen, 2200 Copenhagen, Denmark, and Department of Histology, Novo Nordisk A/S, Copenhagen, Denmark.

The novel neuropeptide cocaine-amphetamine-regulated transcript (CART) is expressed in several hypothalamic regions and has recently been shown to be involved in the central control of food intake. To characterize the hypothalamic CART neurons and understand the physiological functions they might serve, we undertook an in situ hybridization and immunohistochemical study to examine distribution and neurochemical phenotype of these neurons. In situ hybridization studies showed abundant CART mRNA in the periventricular nucleus (PeV), the paraventricular nucleus of the hypothalamus (PVN), the supraoptic nucleus (SON), the arcuate nucleus (Arc), the zona incerta, and the lateral hypothalamic area. The distribution of CART-immunoreactive neurons as revealed by a monoclonal antibody raised against CART(41-89) displayed complete overlap with CART mRNA. Double immunohistochemistry showed co-existence of CART immunoreactivity (CART-IR) and somatostatin in some neurons of the PeV. In the magnocellular division of the PVN as well as the SON, CART-IR was demonstrated in both oxytocinergic and vasopressinergic perikarya. In the medial parvicellular region of the PVN a few CART-IR neurons co-localized galanin, but none was found to co-localize corticotropin-releasing hormone. In the Arc, almost all pro-opiomelanocortinergic neurons were shown to contain CART, whereas no co-localization of CART with NPY was found. In the lateral hypothalamic area nearly all CART neurons were found to contain melanin-concentrating hormone. The present data support a role for CART in neuroendocrine regulation. Most interestingly, CART is co-stored with neurotransmitters having both positive (melanin-concentrating hormone) as well as a negative (pro-opiomelanocortin) effect on food intake and energy balance.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10234051&dopt=Abstract

Photochem Photobiol. 2003 Jan;77(1):41-5.
The action spectrum for generation of the primary intermediate revealed by ultrafast absorption spectroscopy studies of pheomelanin.

Ye T, Simon JD.

Department of Chemistry, Duke University, Durham, NC 27708-0346, USA.

The observation that fair-skinned individuals are more susceptible to skin cancers is commonly explained by invoking an enhanced photoreactivity of the red melanin, pheomelanin compared with the black melanin, eumelanin. For the wavelength range from 500 to 1000 nm, pump-probe spectroscopic measurements reveal the photoexcitation of pheomelanin by UVA light that generates an immediate (< 100 fs) transient absorption centered at 780 nm. Using a tunable femtosecond excitation source, the action spectrum between 300 and 390 nm for generation of the primary intermediate was measured. Similar action spectra are found for the sample with molecular weight (MW) between 1000 and 10 000 and the one with MW > 10 000 fractions of pheomelanin, indicating that the reactive chromophore has a low MW but is present and its photophysics is similar in the aggregated pigment. The shape of the action spectrum differs from the absorption spectrum of bulk melanin and mass-selected fractions but resembles reported absorption spectrum of benzothiazines, oxidation products of 5-S-cysteinyl-dopa, which are formed along the biosynthetic pathway of pheomelanin.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12856881&dopt=Abstract [PubMed - in process]

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