Non-covalent functionalization of multi-walled carbon nanotubes with organic aromatic compounds.

Lemek, Tadeusz,Mazurkiewicz, Jó,zef,Stobinski, Leszek,Lin, Hong Ming,Tomasik, Piotr American Scientific Publishers 2007 Journal of nanoscience and nanotechnology Vol.7 No.9

<P>Several aromatic compounds derived from benzene by its annelation (naphthalene, anthracene, phenanthrene, pyrene) and exocyclic substitution (e.g., nitrobenzene, dinitrobenzenes, trinitrobenzene, chlorobenzene, N,N-dimethylaniline, and others) and endocyclic substitution (pyridine, quinoline, isoquinoline) efficiently sorbed on multi-walled carbon nanotubes (MWCNTs). Equilibrium constants for the sorption process have been determined. Computations of the energy of formation were performed for surface complexes of those arenes on single-walled carbon nanotubes (SWCNTs). Formation energies of those complexes were correlated against the experimental equilibrium constants. The latter were also correlated against calculated LUMO energy of the arenes. Solely, limited tendencies to the linearity could be observed. The analysis of the results of the correlations indicated that the arenes acting as the charge acceptors formed stronger complexes than arenes with a high electron density in the molecular orbital, for instance, N, N-dimethylaniline. The area of the arene--SWCNT contact was very essential for the complexation. The proximity of the HOMO orbital of SWCNT and LUMO of the arene was another essential factor. Bulky substituents in the arene molecules obscured their efficient contact with SWCNT.</P>

Effect of Lactobacillus acidophilus Bauer and Bifidobacterium animalis ssp. lactis BB12 on proteolytic changes in dry-cured loins

Anna Okon´,Joanna Stadnik,Zbigniew Jo´zef Dolatowski 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.3

The effect of the potentially probiotic bacteria strain of Lactobacillus acidophilus Bauer and probiotic bacteria Bifidobacterium animalis ssp. lactis BB12 on proteolytic changes of proteins in dry-cured loins during fermentation and cold storage was studied. Results of the conducted tests demonstrated that the use of probiotic bacteria for the production of dry-cured meats impacts the generation of products of protein proteolysis with high antioxidant activity. The highest antioxidant activity of peptides after fermentation and cold storage was observed in the loin with the strain B. animalis ssp. lactis BB12 and the loin with the mixture of strains L. acidophilus Bauer and B. animalis ssp. lactis BB12. Qualitative analysis of peptides demonstrated that peptides with weight below 3.5 kDa are characterized by the highest capacity of quenching the ABTS cation radical, including the peptides in loins with the strain B. animalis ssp. lactis BB12.

Statistical division of compressive strength results on the aspect of concrete family concept

Józef Jasiczak,Marcin Kanoniczak,Łukasz Smaga 사단법인 한국계산역학회 2014 Computers and Concrete, An International Journal Vol.14 No.2

The article presents the statistical method of grouping the results of the compressive strength of concrete in continuous production. It describes the method of dividing the series of compressive strength results into batches of statistically stable strength parameters at specific time intervals, based on the standardized concept of “concrete family”. The article presents the examples of calculations made for two series of concrete strength results, from which sets of decreased strength parameters were separated. When assessing the quality of concrete elements and concrete road surfaces, the principal issue is the control of the compressive strength parameters of concrete. Large quantities of concrete mix manufactured in a continuous way should be subject to continuous control. Standardized approach to assessing the concrete strength proves to be insufficient because it does not allow for the detection of subsets of the decreased strength results, which in turn makes it impossible to make adjustments to the concrete manufacturing process and to identify particular product or area on site with decreased concrete strength. In this article two independent methods of grouping the test results of concrete with statistically stable strength parameters were proposed, involving verification of statistical hypothesis based on statistical tests: Student’s t-test and Mann – Whitney – U test.

Liquefaction of macroalgae Enteromorpha biomass for the preparation of biopolyols by using crude glycerol

Paulina Kosmela,Paweł Kazimierski,Krzysztof Formela,Józef Haponiuk,Łukasz Piszczyk 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-

This article describes the liquefaction process of macroalgae Enteromorpha with the use of crude glycerolas a solvent and a reagent, aimed at obtaining of new bio-polyols, which are characterized with respect totheir chemical structure, physical and thermal properties. Six different biopolyols were prepared. Inorder to optimize the liquefaction of algal biomass for the best bio-polyol properties, two catalysts(sulfuric or orthophosphoric acid) and three process temperatures (120–180 C) were applied. Bio-polyoldisplaying the most advantageous properties (hydroxyl number 590 mg KOH/g and 86% biomassconversion) was obtained at 150 C in the presence of sulfuric acid as a catalyst.

Development and Evaluation of an Immunoglobulin Y-Based ELISA for Measuring Prostate Specific Antigen in Human Serum

Agnieszka Łupicka-Słowik,Renata Grzywa,Ewa Leporowska,Danuta Procyk,Józef Oleksyszyn,Marcin Sieńczyk 대한진단검사의학회 2019 Annals of Laboratory Medicine Vol.39 No.4

Background: Measurement of serum prostate specific antigen (PSA) concentrations remains one of the leading methods for diagnosing prostate cancer. We developed and evaluated an immunoglobulin Y (IgY)-based ELISA to measure total PSA (tPSA) concentrations in human serum that could be used as an alternative to commercially available in vitro diagnostic assays that rely on mouse monoclonal IgG. Methods: A sandwich ELISA based on an anti-PSA IgY antibody was developed. We evaluated the ability of the anti-PSA IgY antibody to detect free and complexed PSA at the same molar ratio. The assay was optimized, and its analytical performance was verified by calculating limit of background (LoB), limit of detection (LoD), and limit of quantification (LoQ). We performed correlation and regression analyses between tPSA concentrations measured by our ELISA and those from commercial assays: Cobas 6000 (Roche Diagnostics, Warszawa, Poland) and PSA total ELISA (IBL International, Hamburg, Germany). Results: LoB, LoD, and LoQ, were 0.061, 0.083, and 0.100 ng/mL, respectively, and linearity range was 0.100–3.375 ng/mL. tPSA concentrations from our IgY-based ELISA strongly correlated with those from the commercial assays. Conclusions: Our IgY-based ELISA is an efficient equivalent to the above commercial assays. The use of IgY as the detecting agent could reduce the risk of false positive results, as well as decrease the overall cost of analysis.

Serum Concentrations of Selenium and Copper in Patients Diagnosed with Pancreatic Cancer

Marcin R. Lener,Rodney J. Scott,Anna Wiechowska-Koz!owska,Pablo Serrano-Fernández,Piotr Baszuk,Katarzyna Jaworska-Bieniek,Grzegorz Sukiennicki,Wojciech Marciniak,Magdalena Muszy"ska,Józef K!adny,Tomas 대한암학회 2016 Cancer Research and Treatment Vol.48 No.3

Purpose Understanding of the etiology and pathogenesis of pancreatic cancer (PaCa) is still insufficient. This study evaluated the associations between concentrations of selenium (Se) and copper (Cu) in the serum of PaCa patients. Materials and Methods The study included 100 PaCa patients and 100 control subjects from the same geographical region in Poland. To determine the average concentration of Se, Cu, and ratio Cu:Se in the Polish population, assay for Se and Cu was performed in 480 healthy individuals. Serum levels of Se and Cu were measured using inductively coupled plasma mass spectrometry. Results In the control group, the average Se level was 76 !g/L and Cu 1,098 !g/L. The average Se level among PaCa patients was 60 !g/L and the mean Cu level was 1,432 !g/L. The threshold point at which any decrease in Se concentration was associated with PaCa was 67.45 !g/L. The threshold point of Cu level above which there was an increase in the prevalence of PaCa was 1,214.58 !g/L. In addition, a positive relationship was observed between increasing survival time and Se plasma level. Conclusion This retrospective study suggests that low levels of Se and high levels of Cu might influence development of PaCa and that higher levels of Se are associated with longer survival in patients with PaCa. The results suggest that determining the level of Se and Cu could be incorporated into a risk stratification scheme for the selection and surveillance control examination to complement existing screening and diagnostic procedures.