Search results for "MSP"
showing 10 items of 21 documents
Applicability of hybrid linear ion trap-high resolution mass spectrometry and quadrupole-linear ion trap-mass spectrometry for mycotoxin analysis in …
2012
Abstract Recent developments in mass spectrometers have created a paradoxical situation; different mass spectrometers are available, each of them with their specific strengths and drawbacks. Hybrid instruments try to unify several advantages in one instrument. In this study two of wide-used hybrid instruments were compared: hybrid quadrupole-linear ion trap-mass spectrometry (QTRAP ® ) and the hybrid linear ion trap-high resolution mass spectrometry (LTQ-Orbitrap ® ). Both instruments were applied to detect the presence of 18 selected mycotoxins in baby food. Analytical parameters were validated according to 2002/657/CE. Limits of quantification (LOQs) obtained by QTRAP ® instrument ranged …
Drošības radīšanas mehānismi jauniešu ģimenēs
2015
Bakalaura darbs “Drošības radīšanas mehānismi jauniešu ģimenēs” ir pētījums par jauniešu ģimenēm, kur viens vai abi vecāki ir 18-25 gadu vecumā un audzina vienu vai vairākus bērnus. Tā mērķis ir noskaidrot, kā jauno vecāku ģimenes pašas vērtē savu drošumspēju un kādi drošības radīšanas mehānismi tajās tiek izmantoti. Balstoties uz cilvēkdrošības perspektīvu, pētījuma laikā tika veiktas intervijas ar jauniešiem, lai atbildētu uz pētnieciskajiem jautājumiem, kā jaunie vecāki skaidro labu un jēgpilnu dzīvi, kādi ir jauno vecāku mehānismi, lai sasniegtu vēlamo drošību un kā jaunie vecāki vērtē savas iespējas radīt vēlamos dzīves apstākļus. Iegūtie pētījuma rezultāti atklāj, ka iespēja radīt nea…
Multivariate quality control studies applied to Ca(II) and Mg(II) determination by a portable method
1998
Made available in DSpace on 2022-04-28T19:53:14Z (GMT). No. of bitstreams: 0 Previous issue date: 1998-01-01 A portable or field test method for simultaneous spectrophotometric determination of calcium and magnesium in water using multivariate partial least squares (PLS) calibration methods is proposed. The method is based on the reaction between the analytes and methylthymol blue at pH 11. The spectral information was used as the X-block and the Ca(II) and Mg(II) concentrations obtained by a reference technique (ICP-AES) were used as the Y-block. Two series of analyses were performed, with a month's difference between them. The first series was used as the calibration set and the second on…
Optical properties of Ge-oxygen defect center embedded in silica films
2007
The photo-luminescence features of Ge-oxygen defect centers in a 100nm thick Ge-doped silica film on a pure silica substrate were investigated by looking at the emission spectra and time decay detected under synchrotron radiation excitation in the 10-300 K temperature range. This center exhibits two luminescence bands centered at 4.3eV and 3.2eV associated with its de-excitation from singlet (S1) and triplet (T1) states, respectively, that are linked by an intersystem crossing process. The comparison with results obtained from a bulk Ge-doped silica sample evidences that the efficiency of the intersystem crossing rate depends on the properties of the matrix embedding the Ge-oxygen defect ce…
Experimental Validation of a Novel Method for Harmonic Mitigation for a Three-Phase Five-Level Cascaded H-Bridges Inverter
2019
In modern high-power electrical drives, the efficiency of the system is a crucial constraint. Moreover, the efficiency of power converters plays a fundamental role in modern applications requiring also a limited weight, such as the electric vehicles and novel more electric aircraft. The reduction of losses pushes for systems with a dc bus and a high number of dc/ac converters, widespread in the vehicle, not burdened by a too expensive data processing system. The purpose of this article is to concur to reduce losses by proposing an innovative selective harmonic mitigation method based on the identification of the working areas where the reference harmonics present lower amplitudes. In partic…
The Role of the Internet in Overcoming Information Barriers: Implications for Exporting SMEs of the East African Community
2012
Small and medium-sized enterprises play a significant role in the East African Community, contributing highly to the national income and employing a significant number of people. Exportation provides a great opportunity for these enterprises to expand their businesses and improve their performance. However, they encounter a number of information- related barriers before and during exportation. Based on literature, this paper identifies these barriers and discusses how the internet could be used to reduce them. Based on the internet, international business and small business literature, the paper provides propositions and develops a model that will be useful for future studies in this area.
Militārās jomas reālijas apzīmējošā leksika Homēra poēmā Īliada
2017
Bakalaura darba tēma Militārās jomas reālijas apzīmējošā leksika Homēra poēmā “Īliada” izvirza mērķi – pamatojoties uz militārās jomas leksikas analīzi Homēra poēmā Īliada, noskaidrot tekstā pieminēto un raksturoto reāliju atbilstību pirmspolisas periodam. Lai sasniegtu šo mērķi autore iepazinās ar mūsdienu teorētisko un zinātnisko literatūru, kas klāsta par Homēra poēmām un pirmspolisas periodu, un ar vēsturisko literatūru, kas sniedz arheoloģijas liecības par XI-IX gs. p. m. ē.; izpētīja Homēra Īliadas oriģināltekstu un veica nepieciešamo leksēmu atlasi un tulkojumu. Pētījumā tika izmantota sastatījuma metode. Pētījuma beigās tika secināts, ka atsevišķas aprakstītās Homēra Īliadā militārā…
Application of an HPLC-MS/MS method for mycotoxin analysis in commercial baby foods
2012
Abstract This article describes the validation of an analytical method for the detection of 21 mycotoxins in baby food. The analytical method is based on the simultaneous extraction of selected mycotoxins by matrix solid-phase dispersion (MSPD) followed by liquid chromatography coupled with tandem mass spectrometry (LC–MS/MS) using a hybrid triple quadrupole-linear ion trap mass spectrometer (QTRAP®). Information Dependent Acquisition (IDA), an extra confirmation tool for samples that contain the selected mycotoxins, was used. The matrix effects were evaluated, and the corrections for the matrix effects were performed using two calibration approaches: external matrix-matched calibration and…
Analysis of RET promoter CpG island methylation using methylation-specific PCR (MSP), pyrosequencing, and methylation-sensitive high-resolution melti…
2016
Background Already since the 1990s, promoter CpG island methylation markers have been considered promising diagnostic, prognostic, and predictive cancer biomarkers. However, so far, only a limited number of DNA methylation markers have been introduced into clinical practice. One reason why the vast majority of methylation markers do not translate into clinical applications is lack of independent validation of methylation markers, often caused by differences in methylation analysis techniques. We recently described RET promoter CpG island methylation as a potential prognostic marker in stage II colorectal cancer (CRC) patients of two independent series. Methods In the current study, we analy…
Occurrence of fourteen mycotoxins in tiger-nuts
2012
Abstract A previous developed matrix solid-phase dispersion (MSPD) extraction method was applied for the routine analysis of aflatoxins (AFs), ochratoxin A (OTA), fumonisins (FB 1 and FB 2 ), beauvericin (BEA), nivalenol (NIV), deoxynivalenol (DON), the toxin T-2 (T-2), toxin HT-2 (HT-2), diacetoxyscirpenol (DAS) and zearalenone (ZEN) in tiger-nuts by liquid chromatography–triple-quadrupole linear ion trap (HPLC–QTRAP ® ). The extraction solid support used was C 18 , while the elution solvent was acetonitrile/methanol (50/50, v/v) 1 mM ammonium formate. Using matrix-matched calibration, recoveries and repeatabilities were in the range 67–89% and 2–11% relative standard deviation (RSD), resp…