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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

Ultrasound Obstet Gynecol. 2003 Jun;21(6):583-8.
Endometrial blood flow mapping using transvaginal power Doppler sonography in women with postmenopausal bleeding and thickened endometrium.

Alcazar JL, Castillo G, Minguez JA, Galan MJ.

Department of Obstetrics and Gynecology, Clinica Universitaria de Navarra, University of Navarra, School of Medicine, Pamplona, Spain. jlalcazanav.es

OBJECTIVE: To evaluate the role of transvaginal power Doppler sonography to discriminate between benign and malignant endometrial conditions in women presenting with postmenopausal bleeding and thickened endometrium at baseline sonography. METHODS: Ninety-one postmenopausal women (median age, 58 years; range, 47-83 years) presenting with uterine bleeding and a thickened endometrium (> or = 5-mm double-layer endometrial thickness) on transvaginal sonography were included in this prospective study. Endometrial blood flow distribution was assessed in all patients by power Doppler immediately after B-mode transvaginal sonography. Three different vascular patterns were defined: Pattern A: multiple-vessel pattern, Pattern B: single-vessel pattern and Pattern C: scattered-vessel pattern. Histological diagnoses were obtained in all cases. No patient taking tamoxifen citrate or receiving hormone replacement therapy was included. RESULTS: Histological diagnoses were as follows: endometrial cancer: 33 (36%), endometrial polyp: 37 (41%), endometrial hyperplasia: 14 (15%), endometrial cystic atrophy: 7 (8%). Blood flow was found in 97%, 92%, 79% and 85% of cases of carcinoma, polyp, hyperplasia and endometrial cystic atrophy, respectively. A total of 81.3% of vascularized endometrial cancers showed Pattern A, 97.1% of vascularized polyps exhibited Pattern B and 72.7% of vascularized hyperplasias showed Pattern C. Sensitivity and specificity for endometrial cancer were 78.8% and 100%. For endometrial polyp these respective values were 89.2% and 87% and for hyperplasia they were 57.1% and 88.3%. CONCLUSIONS: Transvaginal power Doppler blood flow mapping is useful to differentiate benign from malignant endometrial pathology in women presenting with postmenopausal bleeding and thickened endometrium at baseline sonography. 2003 ISUOG. Published by John Wiley & Sons, Ltd.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12808676&dopt=Abstract [PubMed - in process]

Aging Male. 2003 Mar;6(1):8-12.
Age-related change in serum concentrations of testosterone in middle-aged Korean men.

Kang YG, Bae CY, Kim S, Kim MJ, Lee YJ, Seo J, Kim YC.

Department of Family Medicine, College of Medicine, Pochon CHA University, 351 Yatap-dong, Pundang-gu, Sungnam, Kyonggi-do, 463-712 Korea.

The objective of this study was to determine whether testosterone and sex hormone binding globulin (SHBG) levels are different between healthy men and men with chronic illness, and to evaluate the age-related changes of testosterone and SHBG in healthy men in Korea. enrollment took place between January 2000 and December 2001 at Pundang CHA General Hospital in Korea. All men who came for male climacteric and geriatric health screening examinations were eligible. Of the 762 men recruited, 136 men had at least one present or previous medical illness and 626 men were healthy. Higher serum concentrations of total testosterone (5.31 +/- 1.88 ng/ml vs. 4.96 +/- 1.43 ng/ml; p < 0.05), free androgen index (16.60 +/- 7.36 vs. 14.57 +/- 5.55; p < 0.01) and calculated bioavailable testosterone (8.88 +/- 3.52 nmol/l vs. 7.91 +/- 2.52 nmol/l; p < 0.01) were demonstrated in the healthy compared with the disease group. Total testosterone declined at a rate of 0.2% per year, SHBG increased by 1.74% per year, calculated bioavailable testosterone declined by 0.8% per year, and free androgen index declined by 1.15% per year in healthy subjects aged between 40 and 70. The above results seem to be consistent with previous Western studies, showing higher concentrations of testosterone in healthy men, that decline with increasing age.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12809075&dopt=Abstract

Biochemistry. 2003 Jun 24;42(24):7571-9.
Identification of the putative MAP kinase docking site in the thyroid hormone receptor-beta1 DNA-binding domain: functional consequences of mutations at the docking site.

Lin HY, Zhang S, West BL, Tang HY, Passaretti T, Davis FB, Davis PJ.

Stratton Veterans Affairs Medical Center, Albany, New York 12208, USA.

In CV-1 cells transfected with wild-type (wt) nuclear thyroid hormone receptor TRbeta1 (TR), L-thyroxine (T(4)) causes activation and nuclear translocation of mitogen-activated protein kinase (MAPK, ERK1/2), co-immunoprecipitation of MAPK and TR, and MAPK-dependent serine phosphorylation of TR. In the present studies, we have identified (1) the likely site of TR serine phosphorylation in the TR DNA-binding domain (DBD) by T(4)-activated MAPK, (2) the site of MAPK docking on TR induced by T(4), and (3) functional consequences of TR docking site and serine phosphorylation site mutations on co-repressor and co-activator binding and on transcriptional activation by wt and mutant receptors in T(4)-treated cells. Plasmids containing TR(wt), serine 142-substituted TR (TR(S142A) or TR(S142E)), TR(K128A), TR(R132A), or TR(R133A) were transfected into CV-1 cells, and the cells were treated with 10(-7) M T(4) for 30 min. Activated MAPK was present in nuclear fractions of all T(4)-treated cells and co-immunoprecipitated prominently with TR(wt), TR(S142A), and TR(S142E). TR(K128A) complexing with activated MAPK was minimally detectable, but no association of MAPK with TR(R132A) or TR(R133A) was seen in cells treated with T(4). Serine phosphorylation of TR(wt), but not of any mutants, occurred with T(4). In in vitro phosphorylation studies, constitutively activated MAPK phosphorylated only TR(wt). We concluded that serine 142 of the TR DBD is the likely site of phosphorylation by T(4)-activated MAPK and that the docking site on TR for activated MAPK includes residues 128-133 (KGFFRR), a basic amino acid-enriched motif novel for MAPK substrates. TR mutations in the proposed MAPK docking domain and at residue 142 modulated T(4)-conditioned shedding of co-repressor and recruitment of co-activator proteins by the receptor, and they altered transcriptional activity of TR in a thyroid hormone response element-luciferase reporter assay.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12809513&dopt=Abstract

Neuroscience. 2003;119(3):643-52.
Effects of postischemic environment on transcription factor and serotonin receptor expression after permanent focal cortical ischemia in rats.

Dahlqvist P, Ronnback A, Risedal A, Nergardh R, Johansson IM, Seckl JR, Johansson BB, Olsson T.

Department of Public Health and Clinical Medicine, Medicine, Umea University Hospital, S-901 85, Umea, Sweden.

Housing rats in an enriched environment improves functional outcome after ischemic stroke, this may reflect neuronal plasticity in brain regions outside the lesion. Which components of the enriched environment that are of greatest importance for recovery after brain ischemia is uncertain. We have previously found that enriched environment and social interaction alone both improve functional recovery after focal cerebral ischemia, compared with isolated housing with voluntary wheel-running. In this study, the aim was to separate components of the enriched environment and investigate the effects on some potential mediators of improved functional recovery; such as the inducible transcription factors nerve growth factor-induced gene A (NGFI-A) and NGFI-B, and the glucocorticoid and serotonin systems.After permanent middle cerebral artery occlusion, rats were divided into four groups: individually housed with no equipment (deprived group), individually housed with free access to a running wheel (running group), housed together in a large cage with no equipment (social group) or in a large cage furnished with exchangeable bars, chains and other objects (enriched group). mRNA expression of inducible transcription factors, serotonin and glucocorticoid receptors was determined with in situ hybridisation 1 month after cerebral ischemia. Rats housed in enriched or social environments showed significantly higher mRNA expression of NGFI-A and NGFI-B in cortical regions outside the lesion and in the CA1 (cornu ammonis region of the hippocampus), compared with isolated rats with or without a running wheel. NGFI-A and NGFI-B mRNA expression in cortex and in CA1 was significantly correlated to functional outcome. 5-Hydroxytryptamine receptor 1A (5-HT(1A)) mRNA expression and binding, as well as 5-HT(2A) receptor mRNA expression were decreased in the hippocampus (CA4 region) of the running wheel rats. Mineralocorticoid receptor gene expression was increased in the dentate gyrus amongst wheel-running rats. No group differences were found in plasma corticosterone levels or mRNA levels of glucocorticoid receptor, corticotropin-releasing hormone, 5-HT(2C) or c-fos.In conclusion, we have found that social interaction is a major component of the enriched environment regarding the effects on NGFI-A and NGFI-B expression. These transcription factors may be important mediators of improved functional recovery after brain infarctions, induced by environmental enrichment.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12809685&dopt=Abstract

jhmi.edu

Recent experimental and clinical studies suggest that estrogen may be an important factor influencing neuronal function during normal and pathological aging. Using different behavioral paradigms in rodents, estrogen replacement was shown to enhance learning and memory as well as attenuate learning deficits associated with cholinergic impairment. The goal of this study was to determine whether cognitive sensitivity to estrogen manipulations (short-term ovariectomy and chronic estrogen replacement) is affected by aging. Middle-aged and old female Fischer-344 rats were used to estimate the effects of estrogen manipulations at two different stages of reproductive aging. At middle age, when the females underwent an initial stage of reproductive aging (irregular cyclicity), ovariectomy did not significantly affect the acquisition of the T-maze active avoidance as compared with Sham rats, while estrogen replacement decreased behavioral vulnerability to scopolamine. However, when tested at more advanced stage of aging (consistent diestrus), old ovariectomized rats were more sensitive to scopolamine as compared with the control rats. Moreover, estrogen treatment at this age did not produce any protective effect against scopolamine. Contrasting findings of the effects of estrogen replacement in middle-aged and old rats suggest that the ability of estrogen to enhance the basal forebrain cholinergic function declines with age. These data indicate that aging processes may substantially modulate the mechanisms of estrogen action. A "time window" during which hormone replacement must be initiated in order to be effective could be determined in terms of the stages of reproductive senescence. This study is the first to clearly demonstrate that the cognitive effects of estrogen replacement are still preserved during the initial stages of reproductive aging (irregular cyclicity) and dramatically limited as aging progresses (cessation of proestrus).

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12809703&dopt=Abstract

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