scholarly journals Changing in Larch Sapwood Extractives Due to Distinct Ionizing Radiation Sources

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1613
Author(s):  
Thomas Schnabel ◽  
Marius Cătălin Barbu ◽  
Eugenia Mariana Tudor ◽  
Alexander Petutschnigg
Keyword(s):  
Electron Beam Irradiation ◽  
Resin Acids ◽  
Gas Chromatography Mass Spectrometry ◽  
Wood Extractives ◽  
Qualitative And Quantitative ◽  
Acetone Water ◽  
Radiation Sources ◽  
Ft Ir ◽  
Γ Ray ◽  
Insight Into

Wood extractives have an influence on different material properties. This study deals with the changes in wood extractives of larch sapwood due to two different low doses of energy irradiations. Electron beam irradiation (EBI) and γ-ray irradiation treatments were done by using two industrial processes. After the different modifications the extractions were performed with an accelerated solvent extractor (ASE) using hexane and acetone/water. The qualitative and quantitative chemical differences of irradiated larch sapwood samples were analysed using gas chromatography–mass spectrometry (GC-MS) and Fourier-transform infrared spectroscopy (FT-IR) vibrational spectroscopy methods. The yields of the quantitative extractions decreased due to the two different irradiation processes. While the compounds extracted with nonpolar solvent from wood were reduced, the number of compounds with polar functionalities increased based on the oxidation process. Quantitatively, resin acids and polyphenols were highly affected when exposed to the two irradiation sources, leading to significant changes (up, down) in their relative amount. Furthermore, two new substances were found in the extracts of larch sapwood samples after EBI or γ-ray treatments. New insight into the different effects of larch sapwood and wood extractives by EBI and γ-ray was gained in this study.

Comparative analysis of essential oil obtained from fresh and dried leaves of medicinal sage

2020 ◽  
pp. 39-53
Author(s):  
Tatyana Shcheglova
Keyword(s):  
Comparative Analysis ◽  
Essential Oil ◽  
Raw Materials ◽  
Quantitative Difference ◽  
Botanical Garden ◽  
Component Composition ◽  
Gas Chromatography Mass Spectrometry ◽  
Qualitative And Quantitative ◽  
Salvia Officinalis L ◽  
Medical University

The article presents results of the study of a comparative analysis of essential oil obtained from fresh and dried leaves of medicinal sage (Salvia officinalis L.), growing in the Botanical Garden of the First Moscow State Medical University named after Sechenov. The studies were carried out using gas chromatography– mass spectrometry. Qualitative and quantitative difference in the component composition of the essential oil obtained from fresh and dried raw materials was determined as a result of the study.

scholarly journals Gut Microbiome and Metabolome Profiles Associated with High-Fat Diet in Mice

Metabolites ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 482
Author(s):  
Jae-Kwon Jo ◽  
Seung-Ho Seo ◽  
Seong-Eun Park ◽  
Hyun-Woo Kim ◽  
Eun-Ju Kim ◽  
...  
Keyword(s):  
Gut Microbiota ◽  
Relative Abundance ◽  
High Fat Diet ◽  
Amplicon Sequencing ◽  
Gas Chromatography Mass Spectrometry ◽  
Control Group ◽  
Rrna Gene ◽  
High Fat ◽  
Underlying Mechanisms ◽  
Insight Into

Obesity can be caused by microbes producing metabolites; it is thus important to determine the correlation between gut microbes and metabolites. This study aimed to identify gut microbiota-metabolomic signatures that change with a high-fat diet and understand the underlying mechanisms. To investigate the profiles of the gut microbiota and metabolites that changed after a 60% fat diet for 8 weeks, 16S rRNA gene amplicon sequencing and gas chromatography-mass spectrometry (GC-MS)-based metabolomic analyses were performed. Mice belonging to the HFD group showed a significant decrease in the relative abundance of Bacteroidetes but an increase in the relative abundance of Firmicutes compared to the control group. The relative abundance of Firmicutes, such as Lactococcus, Blautia, Lachnoclostridium, Oscillibacter, Ruminiclostridium, Harryflintia, Lactobacillus, Oscillospira, and Erysipelatoclostridium, was significantly higher in the HFD group than in the control group. The increased relative abundance of Firmicutes in the HFD group was positively correlated with fecal ribose, hypoxanthine, fructose, glycolic acid, ornithine, serum inositol, tyrosine, and glycine. Metabolic pathways affected by a high fat diet on serum were involved in aminoacyl-tRNA biosynthesis, glycine, serine and threonine metabolism, cysteine and methionine metabolism, glyoxylate and dicarboxylate metabolism, and phenylalanine, tyrosine, and trypto-phan biosynthesis. This study provides insight into the dysbiosis of gut microbiota and metabolites altered by HFD and may help to understand the mechanisms underlying obesity mediated by gut microbiota.

Fungal pretreatment of pine wood to reduce the emission of volatile organic compounds

Holzforschung ◽  
2011 ◽  
Vol 65 (4) ◽  
Author(s):  
Daniel Stratev ◽  
Cornelia Gradinger ◽  
Thomas Ters ◽  
Karin Fackler ◽  
Thomas Kuncinger ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Unsaturated Fatty Acids ◽  
Marked Decrease ◽  
Fungal Growth ◽  
Wood Extractives ◽  
Pine Wood ◽  
Acetone Water ◽  
Fungal Pretreatment ◽  
Volatile Organic ◽  
Ophiostoma Piliferum

Abstract Sterilized pine wood strands were treated with the ascomycete Ophiostoma piliferum (Cartapip 97™) in an attempt to reduce aldehyde emissions through degradation of aldehyde-forming precursors. Wooden boards were then produced from the treated strands by means of a laboratory press. VOC emissions of these boards were characterized and the concentrations of seven major substances were followed for a period of 28 days in Markes μ-CTE micro-chambers employing Tenax-TDAS/GC/MS analytics. Boards made from treated strands showed a highly significant (P<0.001) reduction in aldehyde emissions by 70% compared to the control boards, while differences in the monoterpene emissions were not significant (P>0.05). Wood extractives from treated and untreated strands were also analyzed by GC/MS after milling and acetone/water extraction. A marked decrease of C18 unsaturated fatty acids was detected in agreement with the reduction of aldehyde emissions, and the monosaccharides as indicators of fungal growth were depleted and stilbenes and lignans were partially degraded.

scholarly journals Analysis of electrocautery generated smoke by chromatographic-mass spectrometry

2016 ◽  
Vol 43 (2) ◽  
pp. 124-128 ◽  
Author(s):  
JEFFERSON KALIL ◽  
FRANCISCO B. T. PESSINE ◽  
CARLOS H. V. FIDELIS ◽  
FABIO H. MENEZES ◽  
PAULO CESAR RODRIGUES PALMA
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography Mass Spectrometry ◽  
Chemical Components ◽  
Qualitative And Quantitative Analysis ◽  
Porcine Tissue ◽  
Qualitative And Quantitative ◽  
Hyphenated Technique ◽  
Muscular Tissues ◽  
Chromatographic Mass ◽  
Liver Tissues

ABSTRACT Objective: to analyze the chemical components of the smoke from electrocautery from coagulating muscle and liver tissues of pigs. Methods: we collected smoke produced by electrocautery applied to porcine tissue in previously evacuated bottles, with qualitative and quantitative analysis of the compounds present through the hyphenated technique gas chromatography / mass spectrometry. Results: there was a majority of decanal aldehyde in the fumes from the subcutaneous, muscle and liver tissues. Fumes of subcutaneous and muscular tissues also showed the presence of hexanal and phenol. In the fumes of subcutaneous and liver tissues we also found toluene and limonene and, finally, nonanal smoke was present in the muscle and liver tissues. Conclusion: there is increasing evidence showing that smoke from electrocautery used in subcutaneous, muscle and liver tissue is harmful to human health. Thus, there is need to reduce exposure to it or wear masks with filters capable of retaining these particles.

scholarly journals How Can We Find Out What Makes a Good Requirements Engineer in the Age of Digitalization?

2017 ◽  
Vol 7 (3) ◽  
pp. 147
Author(s):  
Yvonne Sedelmaier ◽  
Dieter Landes
Keyword(s):  
Requirements Engineering ◽  
Quantitative Research ◽  
Scientific Basis ◽  
Success Factor ◽  
Quantitative Research Methods ◽  
Qualitative And Quantitative ◽  
Starting Point ◽  
Competence Profile ◽  
Key Success Factor ◽  
Insight Into

Good requirements are commonly viewed as a key success factor for IT (and non-IT) projects, but still there seems to be insufficient insight into which competences requirements engineers need to have these days. Digitalization is likely to pose new challenges to requirements engineering. Chances are that digitalization will change the competences that are necessary for successful requirements engineering. This paper proposes a research design that will be used for clarifying which competences requirements engineers need nowadays and how these competences change due to digitalization. To that end, qualitative and quantitative research methods will be combined for developing a comprehensive competence profile for requirements engineering on a scientific basis. The resulting competence profile constitutes a starting point for devising competence-oriented learning settings. Thus, our research contributes to a better understanding of competences for requirements engineering and improves education of future requirements engineers, in particular for coping with challenges posed by digitalization.

scholarly journals Understanding the dimensions of managerial decency construct

2021 ◽  
Vol 26 (1) ◽  
pp. 37-62
Author(s):  
Belma Hadžiomerović ◽  
Emir Kurtić ◽  
Maja Arslanagić Kalajdžić
Keyword(s):  
Social Exchange ◽  
Social Exchange Theory ◽  
Employee Development ◽  
Theory And Practice ◽  
Measurement Scale ◽  
Mutual Trust ◽  
Comprehensive Overview ◽  
Qualitative And Quantitative ◽  
The Social ◽  
Insight Into

This study aims to improve the understanding of perceived managerial decency by developing an initial set of items for its measurement scale. Based on the social exchange theory and driven by the strong need for instilling more decency and civility in managerial discourse, this study makes a comprehensive overview of the scope and domain of perceived managerial decency and extracts the potential decency dimensions. After conducting a literature review, 50 collected interview responses on typical examples of managerial decency, as perceived by employees, served as a basis for further analysis. Using the content analysis tools, we generated a set of initial items and dimensions of decency. Those were further refined by 21 experts (5 from academia and 16 from the target audience) using the means of qualitative and quantitative assessment. as a result, we define the perceived managerial decency construct and outline its six potential dimensions: (1) respectful interactions, (2) treatment with good manners, (3) employee development, (4) mutual trust, (5) decent feedback, and (6) providing insight into a bigger picture, as well as generate a set of 75 valid items that reflect the decency construct. We further discuss the research implications for theory and practice.

scholarly journals Floristic Diversity and Distribution Pattern of Plant Communities along Altitudinal Gradient in Sangla Valley, Northwest Himalaya

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Pankaj Sharma ◽  
J. C. Rana ◽  
Usha Devi ◽  
S. S. Randhawa ◽  
Rajesh Kumar
Keyword(s):  
Altitudinal Gradient ◽  
Abiotic Factors ◽  
Floristic Diversity ◽  
Sensitive Species ◽  
Rapid Loss ◽  
Altitudinal Distribution ◽  
Northwest Himalaya ◽  
Qualitative And Quantitative ◽  
The Himalaya ◽  
Insight Into

Himalayas are globally important biodiversity hotspots and are facing rapid loss in floristic diversity and changing pattern of vegetation due to various biotic and abiotic factors. This has necessitated the qualitative and quantitative assessment of vegetation here. The present study was conducted in Sangla Valley of northwest Himalaya aiming to assess the structure of vegetation and its trend in the valley along the altitudinal gradient. In the forest and alpine zones of the valley, 15 communities were recorded. Study revealed 320 species belonging to 199 genera and 75 families. Asteraceae, Rosaceae, Apiaceae, and Ranunculaceae were dominant. Among genera,Artemisiafollowed byPolygonum,Saussurea,Berberis, andThalictrumwere dominant. Tree and shrub’s density ranged from 205 to 600 and from 105 to 1030 individual per hectare, respectively, whereas herbs ranged from 22.08 to 78.95 individual/m2. Nearly 182 species were native to the Himalaya. Maximum altitudinal distribution of few selected climate sensitive species was found to be highest in northeast and north aspects. This study gives an insight into the floristic diversity and community structure of the fragile Sangla Valley which was hitherto not available.

scholarly journals What do Gamma Rays tell us about the ISM?: New Insight from the Compton Observatory

1996 ◽  
Vol 169 ◽  
pp. 437-446 ◽  
Author(s):  
Hans Bloemen
Keyword(s):  
Interstellar Medium ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Line Emission ◽  
Cosmic Ray ◽  
Gamma Ray Astronomy ◽  
Early Results ◽  
The Galaxy ◽  
Γ Ray ◽  
Insight Into

Gamma-ray astronomy has become a rich field of research and matured significantly since the launch of NASA's Compton Gamma Ray Observatory in April 1991. Studies of the diffuse γ-ray emission of the Galaxy can now be performed in far more detail and extended into the MeV regime, including both continuum and line emission. These studies provide unique insight into various aspects of the interstellar medium, in particular of the cosmic-ray component. This paper gives a brief review on the diffuse Galactic γ-ray emission and summarizes early results and prospects from the Compton Observatory.

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