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AIDS Read. 2000 Oct;10(10):581-7.
HIV prevention. Assisted reproduction in HIV-discordant couples.

Gilling-Smith C.

Chelsea & Westminster Hospital, London.

Serodiscordant couples in whom the man is HIV-1-positive and the woman is negative have limited options if they wish to have children safely, because sexual intercourse carries a 1-in-500 risk of transmitting virus in semen to the female partner. Sperm washing is a risk-reduction option in which infected sperm are washed free of virus before insemination into the female partner at the time of ovulation. Absence of detectable HIV is verified before insemination using a polymerase chain reaction nucleic acid-based sequence amplification assay. Pregnancy rate per insemination is 14%, based on a European experience of more than 2000 inseminations; to date, there have been no seroconversions in either mother or child. Washed sperm have also been used in other assisted conception treatments, such as in vitro fertilization. In the United States, the CDC has recommended against insemination of women with semen from men infected with HIV. Current data from programs in Europe would suggest sperm washing to be a safe risk-reduction option for heterosexual couples wishing to bear a child. We suggest that sperm washing should only be carried out in dedicated units using a multidisciplinary approach to ensure that couples receive adequate preconceptual counseling, detailed sexual health and fertility assessment, and careful monitoring of the woman's HIV status during treatment and pregnancy.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11068804&dopt=Abstract

Complement Ther Med. 2000 Sep;8(3):157-65.
Efficacy of a potentized homeopathic drug (Arsenicum-Aalbum-30) in reducing cytotoxic effects produced by arsenic trioxide in mice: IV. Pathological changes, protein profiles, and content of DNA and RNA.

Kundu SN, Mitra K, Khuda Bukhsh AR.

Department of Zoology, Kalyani University, Kalyani, India.

OBJECTIVE: To examine if the potentized homeopathic drug Arsenicum Album-30 can help restore the damage produced in protein profiles, DNA and RNA contents in liver and testis as a result of arsenic treatment in mice. DESIGN: Sets of mice were injected with arsenic trioxide, one set was fed with Ars. Alb-30, another with Alcohol-30 and the final set was fed neither. The gel electrophoretic protein profiles and DNA and RNA contents in these three sets were studied. METHODS: Protein profiles were studied by SDS-PAGE method; the DNA and RNA contents were assayed by the standard methods through diphenylamine and orcinol reactions respectively. RESULTS: arsenic trioxide injection produced some pathological conditions, drastic changes (mainly reduction of protein bands) in protein sub-fractions, reduced DNA and RNA contents in both liver and testis; Ars. Alb-30-fed arsenic-intoxicated mice showed revival and restoration in both liver and testis as revealed by gel patterns and quantitative assay of DNA and RNA. CONCLUSION: Efficacy of the homeopathic drug Ars. Alb-30 in reducing arsenic-induced damage to protein and nucleic acids is substantiated and the mechanism of action of the homeopathic drug through expression of regulatory genes inferred. 2000 Harcourt Publishers Ltd.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11068345&dopt=Abstract

Plant J. 2000 Oct;24(2):219-29.
A DNA helicase from Pisum sativum is homologous to translation initiation factor and stimulates topoisomerase I activity.

Pham XH, Reddy MK, Ehtesham NZ, Matta B, Tuteja N.

Plant Molecular Biology Group, International Centre for Genetic Engineering and Biotechnology, PO Box 10504, Aruna Asaf Ali Marg, New Delhi 110 067, India.

DNA helicases play an essential role in all aspects of nucleic acid metabolism, by providing a duplex-unwinding function. This is the first report of the isolation of a cDNA (1.6 kb) clone encoding functional DNA helicase from a plant (pea, Pisum sativum). The deduced amino-acid sequence has eight conserved helicase motifs of the DEAD-box protein family. It is a unique member of this family, containing DESD and SRT motifs instead of DEAD/H and SAT. The encoded 45.5 kDa protein has been overexpressed in bacteria and purified to homogeneity. The purified protein contains ATP-dependent DNA and RNA helicase, DNA-dependent ATPase, and ATP-binding activities. The protein sequence contains striking homology with eIF-4A, which has not so far been reported as DNA helicase. The antibodies against pea helicase inhibit in vitro translation. The gene is expressed as 1.6 kb mRNA in different organs of pea. The enzyme is localized in the nucleus and cytosol, and unwinds DNA in the 3' to 5' direction. The pea helicase interacts with pea topoisomerase I protein and stimulates its activity. These results suggest that pea DNA helicase could be an important multifunctional protein involved in protein synthesis, maintaining the basic activities of the cell, and in upregulation of topoisomerase I activity. The discovery of such a protein with intrinsic multiple activity should make an important contribution to our better understanding of DNA and RNA transactions in plants.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11069696&dopt=Abstract

Clin Chem. 2000 Nov;46(11):1755-61.
Miniature single-particle immunoassay for prostate-specific antigen in serum using recombinant Fab fragments.

Harma H, Tarkkinen P, Soukka T, Lovgren T.

Department of Biotechnology, University of Turku, Tykistokatu 6A, FIN-20520 Turku, Finland. harri.harmtu.fi

BACKGROUND: Quantitative, miniaturized nucleic acid assays and immunoassays can be developed with single microparticles, microfluorometric detection, and intrinsically fluorescent lanthanide chelates in a multiple assay format to decrease reagent consumption, cost, and assay time. We used recombinant Fab fragments to capture and detect free and total prostate-specific antigen (PSA) from serum in a submicroliter volume single-particle immunoassay. METHODS: Genetically engineered thiol-Fab or thiolated monoclonal antibodies (mAbs) were covalently attached onto uniformly sized 60-microm maleimide-activated microparticles. Free and total PSA were detected with europium- or terbium-labeled Fab fragments on a single microparticle using a microfluorometer in a time-resolved mode. RESULTS: The detection limit of the free- and total-PSA assays (mean + 3 SD of zero calibrator) was 0.35 microg/L, with a total volume of 330 nL per particle. An excellent correlation was found in microparticle and microtiter-well assays for 21 serum samples: slopes for free and total PSA were 1.06+/-0.03 and 1.03+/-0.02, respectively (S(y|x) = 0.084 and 0.057 microg/L), with intercepts of 0.013+/-0.018 and 0.013+/-0.017 microg/L (R>0.99). Furthermore, the particle-immobilized Fab fragment had a PSA binding capacity 1.5-fold higher than the intact mAb capacity on a single microparticle. Capacity, kinetics, and sensitivity of the Fab fragment and intact mAb assays in the microparticle and microtiter well formats are discussed. CONCLUSIONS: With site-specific (cysteine tail) covalent attachment of Fab fragments on a microparticle, subattomole amounts of PSA can be detected quantitatively.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11067810&dopt=Abstract

Immunol Lett. 2000 Nov 1;74(3):189-95.
CXCR4 and CCR5 expression by H9 T-cells is downregulated by a peptide-nucleic acid immunomodulator.

Lazzarino DA, Diego M, Musi E, Hirschman SZ, Alexander RJ.

Laboratory of Immunology, Advanced Viral Research Institute, Advanced Viral Research Corp., 200 Corporate Boulevard South, Yonkers, NY 10701, USA.

Product R (Reticulose(TM)) is a peptide-nucleic acid immunomodulator with broad-spectrum antiviral activity that was recently shown to increase expression of mRNAs encoding the proinflammatory cytokines, IFN-gamma, IL-1beta, IL-6 and TNF-alpha. Since these cytokines induce expression of the chemokines, MIP-1alpha, MIP-1beta, RANTES, and SDF-1, all of which inhibit viral infectivity, we were interested to determine if Product R also alters chemokine expression. In addition, the finding, that Product R decreases HIV-1 RNA and extracellular p24 antigen in H9 T-lymphoma cells, suggested to us that this drug may block viral infection by reducing the expression of chemokine receptors on target cells. We have therefore utilized H9 cells to test the effects of Product R on expression of mRNAs encoding the chemokine receptors, CD4, CXCR4 and CCR5, as well as their ligands, IL-16, SDF-1, MIP-1alpha, MIP-1beta, and RANTES, by RT-PCR. We also assayed the effect of Product R on surface receptor expression by flow cytometry, and on the chemotactic activity of these cells towards the CXCR4 ligand, SDF-1, and the CCR5 ligands, MIP-1alpha and RANTES. H9 cells were cultured for 3-21 days in medium containing 5% or 10% Product R, or 5% or 10% PBS. We found that, compared to control cultures, cells cultured in media containing Product R expressed lower amounts of CXCR4 and CCR5 mRNA and surface antigen at all time points. Culture for 3 days in media containing Product R also reduced the ability of cells to migrate towards 10-20 ng/ml SDF-1 and 100-250 ng/ml RANTES. In contrast, Product R had no effect on the expression of CD4 mRNA and receptor protein, or on expression of IL-16 mRNA. These findings suggest that Product R may have clinical efficacy in HIV-1-infected patients by downregulating viral coreceptors on target T-cells.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11064099&dopt=Abstract

Like developmental biology of any part of our body, hair growth is a complicated process. Hence the homework for modern science to yet unravel the process and mechanism to a completion. There exist a number of traditional and alternative therapeutic methods that include drugs, surgery, suppelements, and even snake oils that have been developed and used for those who lose hair. No understanding, and there is no solution. Of course, none of these approaches are perfect for all hair loss problems, especially due to the heterogeneity of the causes underlying hair losses. Most of chemical drugs and hair transplantation surgeries are accompanied by undesirable side effects.

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