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Pandora box of BCA assay. Investigation of the accuracy and linearity of the microplate bicinchoninic protein assay: Analytical challenges and method modifications to minimize systematic errors
Bicinchoninic colorimetric assay is very widely used for total protein quantitative analysis. We report that bicinchoninic (BCA) total protein assay linearity range and the assay sensitivity are counterbalancing factors. BCA assay true linear range may be considerably narrower than the manufacturer’s advertised 20-2000 μg/ml and therefore the choice of the assay calibration range should not …
Binding of Cu+ and Cu2+ with peptides: Peptides = oxytocin, Arg8 -vasopressin, bradykinin, angiotensin-I, substance-P, somatostatin, and neurotensin.
The intrinsic binding ability of 7 natural peptides (oxytocin, arg8 -vasopressin, bradykinin, angiotensin-I, substance-P, somatostatin, and neurotensin) with copper in 2 different oxidation states (CuI/II ) derived from different Cu+/2+ precursor sources have been investigated for their charge-dependent binding characteristics. The peptide-CuI/II complexes, [M – (n-1)H + nCuI ] and [M – (2n-1)H + nCuII …
Diurnal salivary androstenedione and 17-hydroxyprogesterone levels in healthy volunteers for monitoring treatment efficacy of patients with congenital adrenal hyperplasia
Objective: Treatment of congenital adrenal hyperplasia (CAH) patients with glucocorticoids is often challenging since there is a delicate balance between over- and undertreatment. Treatment can be monitored non-invasively by measuring salivary androstenedione (A4) and 17-hydroxyprogesterone (17-OHP). Optimal treatment monitoring requires establishment of reference values in saliva. Design: Descriptive study PATIENTS: For this study saliva of 255 …
The effects of neurosteroid allopregnanolone on synaptic dysfunction in the hippocampus in experimental parkinsonism rats: An electrophysiological and molecular study
The dopaminergic system is a powerful candidate targeted for changes of synaptic plasticity in the hippocampus. Higher incidence of Parkinson’s disease (PD) in men than women indicates the influence of sex hormones on the PD development. Previous studies have shown that neurodegenerative diseases such as PD are related to the decline of Allopregnanolon (Allo), a …
Comparison and commutability study between standardized liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS) and chemiluminescent enzyme immunoassay for aldosterone measurement in blood
A commutability confirmation test for the blood aldosterone measurement was performed on liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS) as a designated comparison method (DCM) and four chemiluminescent enzyme immunoassay (CLEIA) measurement procedures based on metrological traceability. A conventional radioimmunoassay (RIA) and two measurement procedures of CLEIA which obtains RIA equivalent values were also compared. The relationship …
Pulse Methylprednisolone with Oral Prednisolone versus Adrenocorticotropic Hormone in Children with West Syndrome: a Randomized Controlled Trial
Background and purpose: West syndrome is an epileptic encephalopathy of infancy. According to guidelines, adrenocorticotrophic hormone (ACTH) is probably effective for the short-term management of infantile spasm, but there is little uniformity in treatment due to variable response. This study has been done to evaluate the efficacy of pulse methylprednisolone as compared to ACTH in …
WaterMap guided structure-based virtual screening for acetylcholinesterase inhibitors
Structure-based virtual screening of the Enamine database of 1.7 million compounds followed by WaterMap calculations (a molecular dynamics simulation-based method) was applied to identify novel AChE inhibitors. The inhibitory potency of 29 selected compounds against electric eel (ee) AChE was determined using the Ellman’s method. Three compounds were found active (success rate 10%). For the …
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