High-Definition Differential Ion Mobility Spectrometry with Structural Isotopic Shifts for Anionic Compounds.

Differential ion mobility spectrometry (FAIMS) had emerged in the 2000s as a novel tool for postionization separations in conjunction with mass spectrometry (MS). High-definition FAIMS introduced a decade ago has enabled resolution of peptide, lipid, and other molecular isomers with minute structural variations and recently the isotopic shift analyses where the spectral pattern for stable isotopes fingerprints the ion geometry. Those studies, including all isotopic shift analyses, were in the positive mode.

High-Definition Ion Mobility/Mass Spectrometry with Structural Isotopic Shifts for Nominally Isobaric Isotopologues.

We had reported the isotopic envelopes in differential IMS (FAIMS) separations depending on the ion structure. However, this new approach to distinguish isomers was constrained by the unit-mass resolution commingling all nominally isobaric isotopologues. Here, we directly couple high-definition FAIMS to ultrahigh-resolution (Orbitrap) MS and employ the resulting platform to explore the FAIMS spectra for isotopic fine structure.

Immediate Fetal Outcome in Deliveries with Meconium Stained Amniotic Fluid.

Background: Meconium-stained amniotic fluid is considered as the bad predictor of fetal outcome having significant perinatal morbidity and mortality. This study aimed to compare immediate fetal outcomes in meconium-stained amniotic fluid and clear amniotic fluid.

Methods: Hospital-based comparative observational study was conducted from a total of 204 women admitted in labour room at a tertiary level hospital.

Assessing the Dipole Moments and Directional Cross Sections of Proteins and Complexes by Differential Ion Mobility Spectrometry.

Ion mobility spectrometry (IMS) has become a mainstream approach to fractionate complex mixtures, separate isomers, and assign the molecular geometries. All modalities were grouped into linear IMS (based on the absolute ion mobility, ) and field asymmetric waveform IMS (FAIMS) relying on the evolution of at a high normalized electric field (/) that induces strong ion heating. In the recently demonstrated low-field differential (LOD) IMS, the field is too weak for significant heating but locks the macromolecular dipoles to produce novel separations controlled by the relevant directional collision cross sections (CCSs).

Determinants of Uptake of Cervical Cancer Screening among Women Attending Tertiary Level Hospital.

Background: Cervical cancer, being the fourth commonest cancer in women worldwide, is also the most frequent cause of cancer deaths among women in developing and underdeveloped countries. Screening is the gold standard to control the disease yet, its uptake is still very low among Nepalese women. Thus, the objective of this study was to find out the determinants of uptake of cervical cancer screening among women.

Delineation of Isomers by the C Shifts in Ion Mobility Spectra.

Mass spectrometry (MS) and isotopes were intertwined for a century, with stable isotopes central to many MS identification and quantification protocols. In contrast, the analytical separations including ion mobility spectrometry (IMS) largely ignored isotopes, partly because of insufficient resolution. We recently delineated various halogenated aniline isomers by structurally specific splitting in FAIMS spectra.

Low-Field Differential Ion Mobility Spectrometry of Dipole-Aligned Macromolecules.

Ion mobility spectrometry (IMS) with mass spectrometry has grown into a powerful approach to simplify complex mixtures, disentangle isomers, and elucidate their geometries. Two established branches are linear IMS based on the absolute mobility at moderate normalized electric field / and field asymmetric waveform IMS (FAIMS) relying on the evolution of at high / causing strong ion heating. Here, we introduce low-field differential IMS (LODIMS), where the field is too weak for significant heating but suffices to lock the permanent macromolecular ion dipoles, producing novel separations based solely on their alignment.

Structurally Informative Isotopic Shifts in Ion Mobility Spectra for Heavier Species.

The isotopic molecular envelopes due to stable isotopes for most elements were a staple of mass spectrometry since its origins, often leveraged to identify and quantify compounds. However, all isomers share one MS envelope. As the molecular motion in media also depends on the isotopic composition, separations such as liquid chromatography (LC) and ion mobility spectrometry (IMS) must also feature isotopic envelopes.

Perception of Women regarding Respectful Maternity Care during Facility-Based Childbirth.

Background: Respectful care during childbirth has been described as "a universal human right that encompasses the principles of ethics and respect for women's feelings, dignity, choices, and preferences." Many women experience a lack of respectful and abusive care during childbirth across the globe.

Objective: This study aimed to determine women's perception of respectful maternity care (RMC) during facility-based childbirth.

High-Resolution Ion Mobility Separations of Isomeric Glycoforms with Variations on the Peptide and Glycan Levels.

Glycosylation is a ubiquitous post-translational modification (PTM) that strongly affects the protein folding and function. Glycosylation patterns are impacted by many diseases, making promising biomarkers. Glycans are also the most complex PTMs, exhibiting isomers (linkage, anomers, and those with isomeric moieties).

Effect of ethanolic extract of Melia dubia leaves on full-thickness cutaneous wounds in Wistar rats.

In recent years, the therapeutic effects of phyto-principles have been appreciated for their promising effects on wound healing. Melia dubia (Malabar neem) possesses anti-cancer, anti-diabetic, anti-tumor, anti-inflammatory, antioxidant, antibacterial, and fungicidal properties. Here, we studied the wound healing efficacy of ethanolic extract of M.

Elemental Dependence of Structurally Specific Isotopic Shifts in High-Field Ion Mobility Spectra.

Nearly all molecules incorporate at least one element with stable isotopes, yielding ubiquitous isotopologic envelopes in mass spectra. Those envelopes split in differential or field asymmetric waveform ion mobility (FAIMS) spectra depending on the ion geometry, enabling a new general approach to isomer delineation as we demonstrated for chloroanilines. Here, we report that analogous bromoanilines exhibit qualitatively distinct isotopic shifts under identical conditions, some changing signs depending on the gas.

Identification of Isomers by Multidimensional Isotopic Shifts in High-Field Ion Mobility Spectra.

Nearly all molecules incorporate elements with stable isotopes. The resulting isotopologue envelopes in mass spectra tell the exact stoichiometry but nothing about the geometry. Chromatography and electrophoresis at high resolution also can distinguish isotopologues, again without revealing structural information.

Factors Associated with the Utilization of Institutional Delivery Service among Mothers.

Background: Assessment of utilization of institutional delivery services is crucial to reduce risk of maternal mortality and morbidity in countries like Nepal. This study was conducted to find out the proportion of utilization of institutional delivery service and associated factors among mothers.

Methods: Data was collected from the total of 129 mothers of Kathar VDC, Chitwan district who delivered baby within last one year proceeding the period of data collection using census method.