a reliable quantitative structure retention relationship (qsrr) study has been evaluated to predict the retention indices (ris) of a broad spectrum of compounds, namely 118 non-linear, cyclic and heterocyclic terpenoids (both saturated and unsaturated), on an hp-5ms fused silica column. a principal component analysis showed that seven compounds lay outside of the main cluster. after elimination...

INTRODUCTION Plant volatiles (PVOCs) are important targets for studies in natural products, chemotaxonomy and biochemical ecology. The complexity of PVOC profiles often limits research to studies targeting only easily identified compounds. With the availability of mass spectral libraries and recent growth of retention index (RI) libraries, PVOC identification can be achieved using only gas chro...

BACKGROUND/AIMS The aim of this study was to investigate the effects of an atypical antipsychotic risperidone (RIS; 0.06, 0.125 or 0.25 mg/kg, intraperitoneal, i.p.) on learning and memory processes, both in naive and MK-801-treated (0.15 mg/kg, i.p.) rats. METHODS Modified elevated plus maze (mEPM), passive avoidance (PA) and Morris water maze (MWM) tasks were used. RESULTS In the mEPM tes...

Intron retention, one of the most prevalent alternative splicing events in plants, can lead to introns retained in mature mRNAs. However, in comparison with constitutively spliced introns (CSIs), the relevantly distinguishable features for retained introns (RIs) are still poorly understood. This work proposes a computational pipeline to discover novel RIs from multiple next-generation RNA seque...

One of the important modes of pre-mRNA post-transcriptional modification is alternative splicing. Alternative splicing allows creation of many distinct mature mRNA transcripts from a single gene by utilizing different splice sites. In plants like Arabidopsis thaliana, the most common type of alternative splicing is intron retention. Many studies in the past focus on positional distribution of r...

ferent among treatments. Protozoal counts were not different among treatments (P > 0.05) in ruminal or omasal samples. Generic protozoal counts were not different (P > 0.05) among treatments, corresponding with similar banding profiles from DGGE. Multivariate statistics showed no difference (P > 0.05) in generic distribution of protozoa in ruminal vs. omasal samples, supporting absence of selec...

Former students (N = 373) of a course in cognitive psychology (CP), conducted between 1978 and 1989, completed memory tests to assess retention of CP. Memory for proper names of researchers, concepts, and conceptual relations varied with retention interval (RI), and memory performance declined over the first 36 months of retention and then stabilized at above-chance levels for the remainder of ...

The replacement of fossil carbon sources with green bio-oils promotes the importance several hundred oxygenated hydrocarbons, which substantially increases analytical effort in catalysis research. A multilinear regression is performed to correlate retention indices (RIs) and response factors (RFs) structural properties. model includes a variety possible products formed during hydrodeoxygenation...

During on-site verification activities conducted by the Technical Secretariat of Organization for Prohibition Chemical Weapons, identification gas chromatography retention indices (RI) data, in addition to mass spectrometry increase reliability factual findings. However, reference RIs do not cover all possible chemical structures. That is why it important have models predict RIs. Applicable onl...

Gas chromatographic prediction of poly-aromatics retention indices in a petroleum crude oil based on matching with reported retention indices on the same stationary phases under a similar temperature program was studied. The bases of the matching with reported retention indices for peaks identifications were mentioned. Deconvulated software was used to separate the overlapped poly-aromatic peaks.