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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

Med Microbiol Immunol (Berl). 2002 Mar;190(4):179-87.
The immunogenicity of Mycobacterium paratuberculosis 85B antigen.

Mullerad J, Michal I, Fishman Y, Hovav AH, Barletta RG, Bercovier H.

Department of Clinical Microbiology, Hadassah Medical School, The Hebrew University, Jerusalem, Israel.

Mycobacterium paratuberculosis (MPT) is the etiological agent of paratuberculosis. The disease is prevalent throughout the world, and exacts a heavy financial toll. At present, the only means of controlling this disease are culling or vaccination. The existing vaccines are not very efficient and produce a long-lasting local reaction at the point of injection and induce anti-bodies/delayed-type hypersensitivity (DTH) reaction that cannot be differentiated from those of naturally infected animals. New potent acellular vaccines that allow discrimination between infected and vaccinated animals are necessary to improve the control of this disease. We have isolated, overexpressed and purified the 85B antigen of MPT, and characterized the immune response induced by this antigen in mice. Our results showed that the recombinant MPT 85B (rMPT 85B) antigen induced a high production of interferon (IFN)gamma, interleukin (IL)-6, IL-10 and nitric oxide (NO). Spleen cells from mice immunized with rMPT 85B in Ribi adjuvant produced a higher level of IL-10 and NO than spleen cells of mice immunized with rMPT 85B only. In contrast, the addition of Ribi to the immunization protocol resulted in a lower amount of IFNgamma released by spleen cells. The levels of spleen cells proliferation in mice vaccinated with the rMPT 85B protein alone or with rMPT 85B with Ribi adjuvant were, respectively, four times or five times greater than in the control mice. The Ribi adjuvant induced significantly higher anti-85B antibody production of all classes tested and increased the IgG1/IgG2a ratio. DTH responses in mice footpads were observed only in mice immunized with rMPT 85B emulsified in Ribi. rMPT 85B induced both a Th1 and Th2 type of immune response with the later slightly more pronounced when the vaccination protocol comprised Ribi as an adjuvant. The rMPT 85B antigen elicited a strong immune response and can be considered as a potential candidate for a future acellular vaccine.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12005331&dopt=Abstract

Structure (Camb). 2002 Mar;10(3):393-402.
Crystal structure of inositol 1-phosphate synthase from Mycobacterium tuberculosis, a key enzyme in phosphatidylinositol synthesis.

Norman RA, McAlister MS, Murray-Rust J, Movahedzadeh F, Stoker NG, McDonald NQ.

Structural Biology Laboratory, Cancer Research U K, London, United Kingdom.

Phosphatidylinositol (PI) is essential for Mycobacterium tuberculosis viability and the enzymes involved in the PI biosynthetic pathway are potential antimycobacterial agents for which little structural information is available. The rate-limiting step in the pathway is the production of (L)-myo-inositol 1-phosphate from (D)-glucose 6-phosphate, a complex reaction catalyzed by the enzyme inositol 1-phosphate synthase. We have determined the crystal structure of this enzyme from Mycobacterium tuberculosis (tbINO) at 1.95 A resolution, bound to the cofactor NAD+. The active site is located within a deep cleft at the junction between two domains. The unexpected presence of a zinc ion here suggests a mechanistic difference from the eukaryotic inositol synthases, which are stimulated by monovalent cations, that may be exploitable in developing selective inhibitors of tbINO.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12005437&dopt=Abstract

Mol Cell Probes. 2002 Feb;16(1):41-8.
In situ identification of mycobacteria in Crohn's disease patient tissue using confocal scanning laser microscopy.

Naser SA, Shafran I, Schwartz D, El-Zaatari F, Biggerstaff J.

Department of Molecular Biology and Microbiology, University of Central Florida, Orlando 32816, USA. naserail.ucf.edu

The diversity in the methodology employed to investigate Crohn's disease (CD) etiology has added significantly to the controversy of the mycobacterial role in this chronic inflammatory bowel disease. Mycobacterium avium subsp paratuberculosis (MAP), a proposed and suspected agent in many CD patients, is a fastidious and very slow grower bacillus, which causes Johne's disease (JD) in cattle. The methodology that has been widely and successfully used for isolation and identification of MAP from and in JD animals is not reliable and has proven to be unsuccessful in achieving the same objectives for CD diagnosis. In this study, a Confocal Scanning Laser Microscopy (CSLM) system has been employed in an attempt to detect MAP in CD patient. In situ hybridization was performed on full thickness tissue using rabbit anti-MAP polyclonal antibody that was adsorbed with E. coli protein extracts. Consequently, MAP was detected in the microvilli region in tissue specimens from CD patient and not in the controls. In the same CD tissue specimen, MAP was not detected when isotype normal rabbit sera was employed. The polyclonal antibody marker may be replaced with monoclonal antibodies, if available, or with MAP-specific-DNA or RNA probes. This technique adds an additional approach to investigate MAP role in CD etiology especially when the culture approach is long and inconsistent.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12005446&dopt=Abstract

Addict Biol. 2002 Apr;7(2):235-41.
Tuberculin skin testing in intravenous drug users: differences between HIV-seropositive and HIV-seronegative subjects.

Portu JJ, Aldamiz-Etxebarria M, Agud JM, Arevalo JM, Almaraz MJ, Ayensa C.

Department of Internal Medicine, Hospital Txagorritxu, Vitoria-Gasteiz, Alava, Spain. jporttxa.osakidetza.net

The prevalence of tuberculin skin test reactions among intravenous drug abusers and differences in tuberculin skin test positivity between HIV-seropositive and HIV-seronegative subjects were evaluated in a cross-sectional study of 1131 subjects. They were recruited from a therapeutic community, from those who attended the centre for the treatment of drug addiction and from those who visited for any reason an acute tertiary-care hospital in Vitoria-Gasteiz, Basque Country (Spain). All subjects underwent skin testing with purified protein derivative (PPD) tuberculin and testing for HIV antibodies. CD4(+) T-lymphocyte count was determined in HIV-seropositive individuals. Positive PPD tests were recorded in 35% of drug users who were HIV-seropositive and in 65% in those who were HIV-seronegative. In the HIV-infected group, there was a significant association between results of the tuberculin test and CD4(+) T-lymphocyte count. When the CD4(+) T-lymphocyte count was > or = 500 cells/mm(3), percentages of positive PPD tests were similar in HIV-seropositives and HIV-seronegatives (47% versus 65%) but when the CD4(+) count was < 500 cells/mm(3), positive PPD tests occurred in only 21% of HIV-seropositives. The PPD test showed a decreased sensitivity for detecting tuberculosis infection in HIV-infected intravenous drug users with CD4(+) T-lymphocyte counts fewer than 500 cells/mm(3).

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12006219&dopt=Abstract

FEMS Microbiol Lett. 1999 Mar 15;172(2):137-43.
Analysis, expression and prevalence of the Mycobacterium tuberculosis homolog of bacterial virulence regulating proteins.

Gupta S, Jain S, Tyagi AK.

Department of Biochemistry, University of Delhi, New Delhi, India.

We have previously reported the identification of a gene from Mycobacterium tuberculosis, H37Rv, which on the basis of its nucleotide sequence encoded a protein product of 38 kDa. This 38-Kda mycobacterial protein designated as VirS exhibits homology with the VirF protein of Shigella, the VirFy protein of Yersinia and the Cfad, Rns and FapR proteins from various enterotoxigenic Escherichia coli strains. In this communication, we show the close sequence and structural similarities of the VirS protein with VirF, VirFy, Cfad, Rns and FapR and describe the results of our studies on the characterization of the virS gene promoter and its expression in E. coli and mycobacteria. virS was present exclusively in the species belonging to the M. tuberculosis complex as revealed by Southern blot and PCR analysis. Our findings suggest the involvement of virS in the regulation of pathogenesis of M. tuberculosis.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10188241&dopt=Abstract

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Hair Loss, or alopecia is a concern for increasing number of folks in aging society. Loss of hair is a visible problem, and affects the appearance and changes identity of a person.
The phenomenon of hair thinning and hair loss is most commonly associated with natural aging, although there are many other causes of hair loss, which include inherited or genetic conditions, illnesses, malnutrition, stress, hormonal problems, chemotherapy, and use of some drugs.
Hair growth is a sophisticated biological process, which has not yet been completely understood. A multitude of therapeutic measures, including drugs, surgery, and suppelements have been made available, and used. However, due to the heterogeneity in the underlying cause, there is no perfect cure for all hair loss cases. Most of chemical drugs and hair transplantation surgeries are not free from varying degrees of undesirable side effects on health.

Hair Million is an alternative solution to hair loss problems. Anecdotally, it shows prositive results and improvement for age-related hair thinning and hair loss for a fraction of people who take it. We do not know the mechanisms of action as to how Hair Million works to help stop hair loss, and promote hair growth. We only know by anecdotal observations. There has been no clinical trials nor placebo controlled statistical analysis on the efficacy of Hair Million on hair loss and hair growth. However, there are two merits in this hair restoration herbal formula:
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