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Am J Kidney Dis. 2000 Nov;36(5):1000-8.
Polymicrobial peritonitis in continuous ambulatory peritoneal dialysis patients.

Kim GC, Korbet SM.

Department of Medicine, Section of Nephrology, Rush-Presbyterian St Luke's Medical Center, Chicago, IL, USA.

We retrospectively evaluated 232 continuous ambulatory peritoneal dialysis (CAPD) patients entering our program from January 1, 1987, to December 31, 1997, for polymicrobial peritonitis. Polymicrobial peritonitis occurred in 16% of the patients (polymicrobial-peritonitis group), whereas 52% of the patients had peritonitis episodes with only a single organism (single-organism group), and 32% of the patients had no episode of peritonitis. Polymicrobial peritonitis accounted for 8% of the 554 peritonitis episodes, occurred after 23 +/- 20 months on peritoneal dialysis (PD), and was preceded by greater than three episodes of peritonitis in 73% of the patients. Peritonitis rates were greater in the polymicrobial-peritonitis group compared with patients in the single-organism group (1.8 versus 1.2 episodes/patient-year; P: < 0.001). The majority of polymicrobial infections involved gram-negative and/or fungal pathogens, but in 21% of the episodes, only gram-positive organisms were identified. An intra-abdominal process was identified in only 7% of the patients. Catheter loss overall was greatest in the polymicrobial-peritonitis group (65% versus single-organism group, 30% versus patients without peritonitis, 5%; P < 0.001), but only 33% of the polymicrobial infections resulted in catheter loss. At last follow-up, 70% of the patients in the polymicrobial-peritonitis group had permanently transferred to hemodialysis compared with 25% from the single-organism group and 15% from the no-peritonitis group (P < 0.001). In conclusion, polymicrobial peritonitis is an infrequent but serious complication of CAPD that occurs late in the course of PD and is often preceded by recurrent episodes of peritonitis. Polymicrobial peritonitis is rarely the result of a catastrophic intra-abdominal process, and although the majority of patients can be successfully treated without catheter removal, the long-term prognosis is poor, with a high rate of transfer to hemodialysis.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11054357&dopt=Abstract

Am J Kidney Dis. 2000 Nov;36(5):1009-13.
Analysis of microbiological trends in peritoneal dialysis-related peritonitis from 1991 to 1998.

Zelenitsky S, Barns L, Findlay I, Alfa M, Ariano R, Fine A, Harding G.

Faculties of Pharmacy and Medicine, University of Manitoba, Canada. zelenits.umanitoba.ca

The microbial cause of peritoneal dialysis-related peritonitis is an important determinant of clinical outcome and the basis of widely used treatment guidelines. Five hundred forty-six cases of peritonitis in 374 patients from 1991 to 1998 were analyzed. The rate of peritonitis declined significantly from 1.37 episodes/patient-year in 1991 to 0.55 episode/patient-year in 1998 (P = 0.02). The rate of Gram-positive peritonitis decreased significantly from 0.75 to 0.28 episode/patient-year during the same period (P = 0.02). Conversely, the occurrence of Gram-negative peritonitis remained constant at approximately 0.16 episode/patient-year (P = 0.28). Staphylococcus epidermidis and Staphylococcus aureus were the most common causes of peritonitis, isolated in 27.8% and 19.3% of the culture-positive cases, respectively. A distinct decrease in peritonitis caused by S epidermidis was observed, with 0.40 episode/patient-year in 1991 compared with 0.11 to 0.20 episode/patient-year during subsequent years. The rate of infections caused by S aureus decreased significantly over time from a high of 0.21 episode/patient-year in 1992 to a low of 0.04 episode/patient-year in 1998 (P = 0.01). Pseudomonas aeruginosa, Escherichia coli, and KLEBSIELLA: species were the most common causes of Gram-negative peritonitis, identified in 7.1%, 6.8%, and 5.2% of culture-positive cases, respectively. The most dramatic increase in antibiotic resistance was seen among S epidermidis. From 1991 and 1992 to 1997 and 1998, resistance to ciprofloxacin increased from 5.4% to 47.8% (P = 0.003), and resistance to methicillin increased from 18.9% to 73.9% (P = 0.03). Our study showed significant trends in the causative pathogens of peritoneal dialysis-related peritonitis and dramatic increases in antibiotic resistance. These data support further study and warrant reevaluation of current treatment practices.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11054358&dopt=Abstract

FEBS Lett. 2003 Apr 24;541(1-3):52-6.
Physiologic cyclic stretch inhibits apoptosis in vascular endothelium.

Liu XM, Ensenat D, Wang H, Schafer AI, Durante W.

VA Medical Center and the Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA.

Since apoptosis of endothelial cells (ECs) plays an important role in the pathogenesis of atherosclerosis, we investigated the effect of cyclic stretch on EC apoptosis. Application of moderate, physiologic levels of cyclic stretch (6-10% at 1 Hz) inhibited EC apoptosis. This anti-apoptotic effect was dependent on the activation of phosphatidylinositol 3-kinase and associated with the activation of Akt and the phosphorylation of Bad. Interestingly, a higher potentially pathologic level of cyclic stretch (20% at 1 Hz) stimulated EC apoptosis. The ability of physiologic cyclic stretch to inhibit EC apoptosis may provide a previously unrecognized mechanism by which hemodynamic forces exert an anti-atherogenic effect.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12706818&dopt=Abstract

Gastroenterology. 2000 Nov;119(5):1203-8.
Bone mineral density in patients with recently diagnosed inflammatory bowel disease.

Schoon EJ, Blok BM, Geerling BJ, Russel MG, Stockbrugger RW, Brummer RJ.

Department of Gastroenterology and Hepatology, University Hospital Maastricht, Maastricht, The Netherlands. ESCint.azm.nl

BACKGROUND & AIMS: A high prevalence of osteoporosis is reported in inflammatory bowel disease (IBD), and its pathogenesis is not completely resolved. We investigated whether bone mineral density (BMD) in patients with IBD at diagnosis is lower than in population controls, and whether BMD differs between patients with Crohn's disease and those with ulcerative colitis. METHODS: In 68 patients and 68 age- and gender-matched population controls, BMD of total body, spine, and hip was assessed using dual-energy x-ray absorptiometry within 6 months after establishing the diagnosis. Determinants for low BMD were assessed. RESULTS: There were no significant differences in BMD (g/cm(2)) between patients and controls, and no significant differences in BMD between patients with either Crohn's disease or ulcerative colitis. Multivariate regression analysis showed that duration of complaints longer than 6 months before diagnosis (P = 0.041), age (P = 0.019), and body mass index less than 20 kg/m(2) (P = 0.006) significantly correlated with low BMD. CONCLUSIONS: BMD in patients with recently diagnosed IBD was not significantly decreased compared with population controls. Subsequent development of osteoporosis in patients with IBD seems to be a phenomenon related to the disease process and/or the treatment modalities of IBD.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11054377&dopt=Abstract

Gastroenterology. 2000 Nov;119(5):1209-18.
Suppression of NF-kappaB activity by sulfasalazine is mediated by direct inhibition of IkappaB kinases alpha and beta.

Weber CK, Liptay S, Wirth T, Adler G, Schmid RM.

Department of Internal Medicine I, University of Ulm, Ulm, Germany.

BACKGROUND & AIMS: Activation of NF-kappaB/Rel has been implicated in the pathogenesis of inflammatory bowel disease (IBD). Various drugs used in the treatment of IBD, such as glucocorticoids, 5-aminosalicylic acid, and sulfasalazine, interfere with NF-kappaB/Rel signaling. The aim of this study was to define the molecular mechanism by which sulfasalazine inhibits NF-kappaB activation. METHODS: The effects of sulfasalazine and its moieties on NF-kappaB signaling were evaluated using electromobility shift, transfection, and immune complex kinase assays. The direct effect of sulfasalazine on IkappaB kinase (IKK) activity was investigated using purified recombinant IKK-alpha and -beta proteins. RESULTS: NF-kappaB/Rel activity induced by tumor necrosis factor alpha, 12-O-tetradecanoylphorbol-13-acetate, or overexpression of NF-kappaB-inducing kinase, IKK-alpha, IKK-beta, or constitutively active IKK-alpha and IKK-beta mutants was inhibited dose dependently by sulfasalazine. Sulfasalazine inhibited tumor necrosis factor alpha-induced activation of endogenous IKK in Jurkat T cells and SW620 colon cells, as well as the catalytic activity of purified IKK-alpha and IKK-beta in vitro. In contrast, the moieties of sulfasalazine, 5-aminosalicylic acid, and sulfapyridine or 4-aminosalicylic acid had no effect. Activation of extracellular signal-related kinase (ERK) 1 and 2, c-Jun-N-terminal kinase (JNK) 1, and p38 was unaffected by sulfasalazine. The decrease in substrate phosphorylation by IKK-alpha and -beta is associated with a decrease in autophosphorylation of IKKs and can be antagonized by excess adenosine triphosphate. CONCLUSIONS: These data identify sulfasalazine as a direct inhibitor of IKK-alpha and -beta by antagonizing adenosine triphosphate binding. The suppression of NF-kappaB activation by inhibition of the IKKs contributes to the well-known anti-inflammatory and immunosuppressive effects of sulfasalazine.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11054378&dopt=Abstract

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