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Fatty acids resources:

Pathogen research abs 1 || Pathogen research abs 2 || Pathogen research abs 3 || Pathogen research abs 4 || Pathogen research abs 5 || Hormone and endocrine research abs 1 || Hormone and endocrine research abs 2 || Hormone and endocrine research abs 3 || Hormone and endocrine research abs 4 || Hormone and endocrine research abs 5 || Follicle and follicular cells research abs 1 || Interferon research abs 1 || Hemoglobin research abs || Stem cell research abs || Nucleic acid research abs





Analyst. 2000 Oct;125(10):1791-8.
Voltammetric measurements of the interaction of metal complexes with nucleic acids.

Aslanoglu M, Isaac CJ, Houlton A, Horrocks BR.

Department of Chemistry, Harran University, Sanliurfa, Turkey.

Cyclic voltammetry and differential-pulse voltammetry at mm-sized electrodes were used to measure the decrease in the rate of diffusion of metal complexes upon binding to DNA and to extract the binding constants and effective binding site sizes. A linear correlation was observed between the site size determined electrochemically and the diameter of the complexes [site size: Cu(phen)2(2+) > Fe(phen)3(2+) > Co(bipy)3(3+) approximately Fe(bipy)3(2+) > Ru(NH3)6(3+)]. The binding constants were found to be influenced by the charge of the metal complex, the nature of ligand and the geometry about the metal centre. Competition experiments, in which differential pulse voltammetry was used to observe the release of bound metal complex on addition of a second DNA-binding molecule to the solution, were sensitive to the nature and location of the binding sites for the two species. Steady-state voltammetric experiments at microelectrodes are shown to have a number of advantages over cyclic voltammetry and differential pulse voltammetry at mm-sized electrodes for determination of binding constants. In particular, the steady-state diffusion limited current is directly proportional to the diffusion coefficient, rather than its square root, which improves the discrimination between DNA-bound and freely diffusing metal complex. Further, the kinetics of the binding process do not affect the steady state measurement, whereas for transient techniques, e.g., cyclic voltammetry, only a range of values can be extracted corresponding to the limits of fast and slow binding kinetics compared to the experimental timescale.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11070548&dopt=Abstract



J Mol Biol. 2000 Nov 17;304(1):11-20.
Deletion analysis defines distinct functional domains for protein-protein and nucleic acid interactions in the ORF1 protein of mouse LINE-1.

Martin SL, Li J, Weisz JA.

Department of Cellular and Structural Biology, University of Colorado School of Medicine, Denver, CO 80262, USA. sandy.martichsc.edu

LINE-1, or L1, is a non-LTR retrotransposon in mammals. Retrotransposition of L1 requires the action of two element-encoded proteins, ORF1p and ORF2p. ORF2p provides essential enzymatic activities for the reverse transcription and integration of a newly transposed copy of L1, whereas the exact role of ORF1p is less well understood. The 43 kDa ORF1p copurifies as a large complex with L1 RNA in extracts of human and mouse cells. Mouse ORF1p purified from Escherichia coli binds RNA and single-stranded DNA in vitro, exhibits nucleic acid chaperone activity, and is capable of protein-protein interaction. In this study we create a series of deletions in the ORF1 sequence, express the truncated proteins and examine their activities to delineate the region of ORF1p responsible for these different functions. By both yeast two-hybrid analysis and GST pull-down assay, the protein-protein interaction domain is defined as a coiled-coil domain that encompasses about one third of the protein near its N terminus. Based on data obtained with UV-cross-linking, electrophoretic mobility-shift assay and an annealing assay, the C-terminal one third of ORF1p is both necessary and sufficient for nucleic acid binding and to promote annealing of complementary oligonucleotides. Separation of these activities into different domains of ORF1p will facilitate detailed biochemical analyses of the structure and function of this protein and understanding of its role during L1 retrotransposition. 2000 Academic Press.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11071806&dopt=Abstract



Methods. 2000 Nov;22(3):271-81.
Antisense oligodeoxynucleotide and ribozyme design.

Probst JC.

Wilex Biotechnology GmbH, Grillparzerstrasse 10b, Munich, D-81675, Germany. christopher.probsilex.de

The overwhelming advances of the last few years in the field of nucleic acid-based technologies laid the basis for the development of this new technology as a frontier method not only to combat diseases and infections but also to study gene function. The development of antisense strategies has generated considerable expectations in the neurosciences and, in particular, behavioral neurobiology. Antisense application in the brain has become a technology with tremendous impact, especially for determining the molecular pathways and substrates of behavior of an organism controlled by independent stimuli. The antisense agents, either oligodeoxynucleotides or ribozymes, interfere in the genetic flow of information from DNA via RNA to protein. According to the literature it seems clear that appropriately modified antisense compounds successfully and stably bind to their target ribonucleic acid molecules. This antisense binding leads to a decrease in the corresponding protein levels. If the targeted protein exerts detrimental effects on the cell or tissue, its reduction should be beneficial from a therapeutic point of view. If the investigator wants to study the function of a specific gene product the selective and transient downregulation of the corresponding target protein will help in functional analysis. In the following article I describe the chemical nature of the antisense oligodeoxynucleotides and some of the most commonly used derivatives and give some guidelines on antisense construction and application. The possible mode of action is discussed, as is expansion of the oligonucleotide-based application to ribozyme-mediated gene inhibition. Finally, problems that may be encountered during antisense application are discussed. 2000 Academic Press.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11071823&dopt=Abstract



Biochem Biophys Res Commun. 2000 Nov 11;278(1):158-66.
A nuclease hypersensitive element in the human c-myc promoter adopts several distinct i-tetraplex structures.

Simonsson T, Pribylova M, Vorlickova M.

Department of Molecular Biotechnology, Chalmers University of Technology, SE 405 30 Goteborg, Sweden. tomarc-lmb.cam.ac.uk

Nucleic acid structure-function correlations are pivotal to major biological events like transcription, replication, and recombination. Depending on intracellular conditions in vivo and buffer composition in vitro, DNA appears capable of inexhaustible structure variation. At moderately acidic, or even neutral pH, DNA strands that are rich in cytosine bases can associate both inter- and intramolecularly to form i-tetraplexes. The hemiprotonated cytosine(+)-cytosine base pair constitutes the building block for the formation of i-tetraplexes, and motifs for their formation are frequent in vertebrate genomes. A major control element upstream of the human c-myc gene, which has been shown to interact sequence specifically with several transcription factors, becomes hypersensitive to nucleases upon c-myc expression. The control element is asymmetric inasmuch as that one strand is uncommonly rich in cytosines and exhibits multiple motifs for the formation of i-tetraplexes. To investigate the propensity for their formation we employ circular dichroism (CD) in combination with ultra violet (UV) spectroscopy and native gel electrophoresis. Our results demonstrate the cooperative formation of well-defined i-tetraplex structures. We conclude that i-tetraplex formation occurs in the promoter region of the human c-myc gene in vitro, and discuss implications of possible biological roles for i-tetraplex structures in vivo. Hypothetical formation of intramolecular fold-back i-tetraplexes is important to c-myc transcription, whereas chromosomal translocation events might involve the formation of bimolecular i-tetraplex structures. 2000 Academic Press.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11071868&dopt=Abstract



Arch Virol. 2003 Jan;148(1):99-113.
Interaction of Bombyx mori nucleopolyhedrovirus BRO-A and host cell protein laminin.

Kang WK, Imai N, Suzuki M, Iwanaga M, Matsumoto S, Zemskov EA.

Laboratory of Molecular Entomology and Baculovirology, RIKEN, Wako, Japan. wkkanostman.riken.go.jp

The Bombyx mori nucleopolyhedrovirus (BmNPV) contains five baculovirus repeated ORF ( bro) genes, all of which are expressed as delayed early genes. We have recently reported that BmNPV BRO proteins, specially BRO-A and BRO-C, contain a nucleic acid binding activity and are involved in nucleosome structures in nuclei of infected cells. To further understand the function of bro-a gene, we looked for factors interacting with BmNPV BRO-A using the yeast two-hybrid system. Fifteen clones obtained from a cDNA library of mock-infected cells and one from a library prepared at 2 h postinfection (p.i.) were found to comprise one distinct gene, which was identified as the Bombyx homolog (bLaminin) of Drosophila laminin beta1. A direct interaction between BRO-A and N-terminal region of bLaminin was demonstrated by in vitro pull-down experiments. Further pull-down assays using BmN cell extracts and anti-laminin antibodies also showed interaction of both proteins. In addition, two more clones were obtained from cDNA library of 12 h p.i. and were found to encode BRO-A itself, indicating that BRO-A forms an oligomer. Taken together, we propose that BRO-A may function as a laminin binding protein.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12536298&dopt=Abstract







Natural Herbal Supplement: Hair Million


Hair loss alone does not pose significant health problems. In fact, there are people who opt for baldness as an alternative hair style. However, in general, however, hair loss is not considered desirable.

The most ostensive feature that distinguishes us human from chimps and other primates is the lack of bodily hair. During evolutionary process, we have lost the majority of hair. Hair is no longer a biologically essential part of our body, just like appendix. The hair we still have on our scalp and a few other bodily parts is still regarded as significant for reasons other than biological necessity. Hair loss is naturally accompanied by aging process, although the extent of hair loss and the timing of onset vary widely among individuals. Thus, loss of hair and baldness is considered as a symbol of maturity or old age. Like winkles and other signs of aging, hair loss is not welcome by most people, because we don't welcome aging, and being perceived as an aging person. However, it is alopecia, or premature hair loss that especially concerns certain people.

While the hair loss and resulting baldness in general have not been proven to be related to underlying health problems, there are certain correlations between hair loss and health problems. For instance, premature hair loss could suggest premature aging or nutritional and hormonal imbalance, stressful life, use of drugs that cause hair loss as a side effect, skin disease, or heart disease. The balding appearance could also impart a subdued impression of integrity in bodily health and youthfulness.












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. Our bodies produce decreasing amount of DHEA as we get older. various health benefits: To deter aging, improve sexual function/erectile dysfunction, treat cognitive decline, enhance athletic performance, facilitate weight loss, improve strength, prevent osteoporosis, enhance immunomodulation for rheumatic conditions, and treat depression.





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