Search results for "spektrometri"

Self-Complementary Dimers of Oxalamide-Functionalized Resorcinarene Tetrabenzoxazines

2018

Self‐complementarity is a useful concept in supramolecular chemistry, molecular biology and polymeric systems. Two resorcinarene tetrabenzoxazines decorated with four oxalamide groups were synthesized and characterized. The oxalamide groups possessed self‐complementary hydrogen bonding sites between the carbonyls and amide groups. The self‐complementary nature of the oxalamide groups resulted in self‐included dimeric assemblies. The hydrogen bonding interactions within the tetrabenzoxazines gave rise to the formation of dimers, which were confirmed by single‐crystal X‐ray diffractions analysis and supported by NMR spectroscopy and mass spectrometry. The self‐included dimers were connected b…

Ion mobility-mass spectrometry of supramolecular complexes and assemblies

2019

Despite their structural and functional differences, synthetic supramolecular assemblies share many similarities with biological assemblies, especially enzymes. The assemblies can be on the same length scale, and their structures and guest binding are typically governed by non-covalent interactions. Thus, only relatively weak interactions define the shape of a synthetic supramolecule or the secondary and tertiary structure of a protein, such that the resulting dynamism makes structure elucidation challenging. For biomolecules such as peptides, proteins, glycans and lipids this has often been tackled using ion mobility–mass spectrometry (IM-MS), whereby analyte ions are separated according t…

Wpływ warunków prowadzenia eksperymentu na wyniki badań biomonitoringowych z zastosowaniem mchów

2017

Minerālvielu saturs mandelēs un valriekstos, un to ūdens ekstraktos

2022

Mandeles un valriekstus var pieskaitīt pie funkcionālās pārtikas izejvielām, kuras satur šķiedrvielas, olbaltumvielas, minerālvielas, polinepiesātinātās taukskābes u.c. bioloģiski aktīvus savienojumus, tai skaitā fitātus. Maģistra darbā izvērtēta literatūra par fitātu ietekmi uz minerālvielu biopieejamību. Veikta minerālvielu kvantitatīvā daudzuma noteikšana mandelēs un valriekstos un to ūdens ekstraktos, izmantojot induktīvi saistītās plazmas masspektrometriju (ICP-MS).

Permeability properties of paper materials

2013

Recent experiments at the JYFLTRAP Penning trap

2020

AbstractThe JYFLTRAP double Penning trap mass spectrometer at the Ion Guide Isotope Separator On-Line (IGISOL) facility offers excellent possibilities for high-precision mass measurements of radioactive ions. Around 400 atomic masses, including around 50 isomeric states, have been measured since JYFLTRAP became operational. JYFLTRAP has also been used as a high-resolution mass separator for decay spectroscopy experiments as well as an ion counter for fission yield studies. In this contribution, an overview of recent activities at the JYFLTRAP Penning trap is given, with a focus on nuclei discussed in the PLATAN2019 meeting.

Development of fast analysis methods for extractives in papermaking process waters

2011

A fast analysis method with an online sample enrichment technique for the analysis of resin and fatty acids present in papermaking process waters was developed. This method was based on atmospheric pressure chemical ionization (APCI) and mass spectrometry (MS) for the detection of [M-H]- ions of compounds of interest. The method was applied to the control of the most prevalent resin (dehydroabietic and abietic) and fatty (palmitic, stearic, oleic, and linolenic) acid levels in papermaking process waters. Continuous data on these acids are of practical importance when predicting possible deposit-derived problems in the paper machine. The first part of the study was focused on the development…

Proteomics in antitumor research

2006

Proteins are the molecular players of fine-tuned regulatory pathways that underlie the behavior of any cell type. Derangement of this wide protein circuitry has a profound effect on cell life and ultimately contributes to the development of diseases such as cancer. New proteomic technologies are rapidly evolving to define and characterize the nodes of this altered protein network, both inside and outside cancer cells. Hopefully, these technologies will become user-friendly laboratory tools to improve cancer management from early detection to the development of rational and patient-tailored therapeutic strategies.

Mass spectrometric analysis of heavy and base oils

2018

Base oil production from crude oil has become more complex as demanded product properties, yield objective and field competition have increased interest in research towards high viscosity index (VI) base oils. Conventional lubricant grade base oil enjoyed biggest market share until 2000-2004 but now high VHVI product demands have introduced also novel production methods for heavy-type base oils such as Ficsher-Tropsch method based gas-to-liquid (GTL) and poly-internal-olefin (PIO) base oils. In this MSc, different mass spectrometric methods for heavy and base oils where compared and in-house field ionization method was characterized and method validation was begun. Base oil mass analytics u…

Ķīmisko elementu saturs dažādos rīsos

2018

Ķīmisko elementu saturs dažādos rīsos. Lāma E., zinātniskais vadītājs Dr. ķīm., doc. Rudoviča V. Bakalaura darbs, 43 lappuses, 13 attēli, 6 tabulas, 34 literatūras avoti, 10 pielikumi. Latviešu valodā. Pētījumā ķīmisko elementu (Zn, Mn, Cu, Se, Sr, Ba, Cd, As, Pb) saturs rīsu paraugos tika noteikts ar induktīvi saistītās plazmas masspektrometrijas metodi, liesmas un elektrotermālās atomabsorbciometrijas analīzes metodēm. Tika izvērtēta elementu masas daļa rīsu paraugos atkarībā no to klasifikācijas, apstrādes veida, ievākšanas valsts.