Simultaneous determination of sildenafil, vardenafil and tadalafil as forbidden components in natural dietary supplements for male sexual potency by high performance liquid chromatography–electrospray ionization

... purchased from supermarket (Changsha, China) All of these products examined are natural dietary supplements for male sexual health, not for therapy of ED The drugs are forbidden to be added in ... containing 20 mmol/l ammonium acetate and 0.2% formic acid (v/v) The gradient elution was programmed as follows: A was maintained at 35% within the first 10 min, then linearly increased to 80% during ... often been added into fluid products such as wine, beverage, and oral liquid formulation, etc Hence, eight liquid products for examination (five oral liquid formulation, two wines, and one beverage,...

Báo cáo lâm nghiệp: "Age trends in genotypic variation of wood density and its intra-ring components in young poplar hybrid crosses" doc

... The mean wood density of a ring is a composite of several intra-ring components, including wood density of early- and latewood and width of early- and latewood, that can vary together or independently ... properties of poplar hybrids: (a) ring width and mean wood density, (b) ring width and minimum wood density, (c) ring width and maximum wood density, (d) mean and minimum wood densities, (e) mean and maximum ... programs The objectives of this study were to: (1) estimate age trends in among -hybrid and among-clone (genotypic) variation and repeatability of wood density and its intra-ring components at diﬀerent...

báo cáo hóa học: " Method optimization and validation for the simultaneous determination of arachidonic acid metabolites in exhaled breath condensate by liquid chromatography-electrospray ionization tandem mass spectrometry" doc

... screw-cap vial for HPLC analysis and 100 µL of the working solution of the internal standard were added to each sample Then the samples were vortex mixed and a 900 µL aliquot was injected into the LC/MS/MS ... some of the structural isomers of prostaglandins, which resulted in the same parent-daughter ion transitions The whole analytical run time, including the recondition step of the column for the ... to the slope and linearity of the calibration curve Due to the low content of matrix compounds in EBC in contrast to other matrix such as urine or plasma which could influence the response of the...

Báo cáo vật lý: "SIMULTANEOUS SPECTROPHOTOMETRIC DETERMINATION OF Pb(II) AND Cd(II) USING ARTIFICIAL NEURAL NETWORKS" potx

... Pb(II)- PAR and Cd(II)- PAR is 518 and 409 nm, respectively Figure shows the 3D absorbance spectra of mixture of Pb(II) and Cd(II) after reaction with PAR at different concentration of Pb(II) and ... Simultaneous Spectrophotometric Determination of Pb(II) and Cd(II) Network trained with 20 epochs were suitable to be used in predicting the response of the concentration of Pb(II) and Cd(II) since ... appropriate for the simultaneous determination of Pb(II) and Cd(II) The average calibration error was found to be 0.767 for simultaneous determination of Pb(II) and Cd(II) The proposed method has...

simultaneous determination of PAHs and PCBs by GCMS Analysis

... IR/07/045 Simultaneous Determination of PAHs and PCBs by GCMS Analysis The National Grid and other Ordnance Survey data are used with the permission of the Controller of Her Majesty’s Stationery Office ... product of a study by the British Geological Survey (BGS) into the development of a technique for the simultaneous determination of PAHs and PCBs by GCMS analysis A multiple component mixture of PAH ... method for the simultaneous separation and identification of PAHs and PCBs by GCMS was successfully developed by this laboratory The programming of associated software to identify and differentiate...

Báo cáo khoa học: Simultaneous improvement of catalytic activity and thermal stability of tyrosine phenol-lyase by directed evolution ppt

... mutations from both the stability and activity mutants, and demonstrated a signiﬁcant improvement in both stability and catalytic activity (Fig 1) As such, the activity and stability mutation combinations ... Rha et al Directed evolution of tyrosine phenol-lyase Table Genetic and catalytic changes of S toebii TPL during evolutionary engineering Library Screening Name Activity mutations Random mutation ... reassembly–screening steps, thereby allowing the directed co -evolution of the stability and catalytic activity of S toebii TPL Materials and methods Materials Sodium pyruvate and PLP were obtained from...

composite of tio2 nanowires and nafion as humidity sensor material

... were measured Results and discussion Fig Humidity characteristic curves of various TiO2 materials: ( ) TiO2 nanowires/ Nafion, ( ) TiO2 powder/Nafion, (᭹) Nafion, ( ) TiO2 nanowires, ( ) TiO2 powder ... 1057 and 1300 cm−1 Fig FTIR spectrum of a TiO2 [anatase] nanowires TEOS–Nafion composite 202 R.-J Wu et al / Sensors and Actuators B 115 (2006) 198–204 Fig Humidity response curve of TiO2 nanowires/ Nafion ... descending humidity, ( ) ascending humidity In this research, humidity sensing was investigated by using the TiO2 nanowires/ Nafion material For humidity range of 12–97% the change in resistance of the TiO2...

Báo cáo hóa học: " Simultaneous circulation of genotypes I and III of dengue virus 3 in Colombia" docx

... Ecuador00b I I I I I I I I I I I I I I I I I I I I I I (V)b I (V)b I (V)b II II II II II II II II II II II II II II II III III III III III III III III III III III III III III III III III III III III 1998 ... Asia/S.Pacific (I) India (III) India (III) India (III) India (III) India (III) India (III) India (III) India (III) India (III) India (III) India (III) India (III) India (III) India (III) India ... (III) India (III) India (III) India (III) India (III) India (III) India (III) India (III) India (III) India (III) *Code in Laboratorio de Virologia, INS repository (Instituto Nacional de Salud,...

báo cáo hóa học:" Research Article Determination of Nonprototypical Valence and Arousal in Popular Music: Features and Performances" potx

... precision (pre), and mean recall (rec) for training with the training and development instances of AllInst, and testing on those of AllInst, Min2/4, and Min3/4 NoLyr feature set, V3 and A3 tasks, ... 3/4 (b) Arousal Figure 8: Distributions of test instances in dependence of prototypicality: AllInst, Min2/4 (minimum of raters agree), and Min3/4 (minimum of raters agree) as ﬂoating, and with ... Seppi, and A Batliner, “The hinterland of emotions: facing the open-microphone challenge,” in Proceedings of the 4th International HUMAINE Association Conference on Aﬀective Computing and Intelligent...

Báo cáo khoa học: "Simultaneous Determination of Various Macrolides by Liquid Chromatography/Mass Spectrometry" pps

... corresponding with Simultaneous Determination of Various Macrolides by Liquid Chromatography/Mass Spectrometry 105 F i g T ot a l ion ch r om a t ogr a p h y (TI C, A) of m a cr olid e a n d t ia ... the simultaneous determination of macrolides The fragmentation patterns provide the confirmatory information of macrolides The relevance of these studies for the determination of macrolide in ... time for the determination of macrolides LC/ MS which omits the derivatization procedures was successfully applied to determine several macrolides Simultaneous determination methods by HPLC with...

Báo cáo y học: " Multi-faceted, multi-versatile microarray: simultaneous detection of many viruses and their expression profiles" pps

... sensitivity of cDNA-chip hybridization is comparable to that of TaqMan-driven quantitative PCR assay, and that the microarray hybridization technique is less likely to be complicated by high false ... be vary depending on the post-translational modifications of histone proteins Methylation, acetylation, and/ or phosphorylation of certain amino acid residues at the amino terminal "tails" of histone ... is their use of microarrays to correlate the cellular "histone code" [6] with the promoter activity of KSHV Usually the transcription of a gene located on chromosomal DNA is influenced not only...

Analysis and determination of cogging torque and unbalanced magnetic forces in permanent magnet spindle motors for hard disk drives

... the electromagnetic forces are extremely stringent Electromagnetic forces such as the cogging torque and unbalanced magnetic pull (UMP) generated in the permanent magnet spindles are of great concerns ... Modeling and Analysis of PM Brushless DC Motors 2.1 Electromagnetic Field in PM Brushless DC Motors In order to study the electromagnetic forces and torques in permanent magnet spindle motors, ... magnet motors used in hard disk drives 2) To build a model for predicting the electromagnetic forces developed in PM motors with sufficient accuracy required for design and analysis of PM spindle...

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