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( Radoslaw Sikora ),( Elzbieta Grzesiuk ),( Sikora Anna ),( Justyna Wojtowicz Sienko ),( Piotr Piela ),( Urszula Zielenkiewicz ),( Karolina Tomczyk Zak ),( Aleksandra Chojnacka ),( Pawe Kowalczyk ),( 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.3
Ferric ion-respiring microorganisms (FRMs) are a group of prokaryotes that use Fe(III) as well as other metals as terminal electron acceptors in the process of anaerobic respiration. Special attention is paid to a biotechnological significance of FRMs because of their potential role in electricity production in microbial fuel cells (MFCs) where the terminal acceptor of the electrons during anaerobic respiration is not a ferric ion but the anode. One of the best known FRMs is the Shewanellaceae family. Most of the Shewanella species have been isolated from marine environments. In this report, sugar beet molasses and ferric oxide were successfully used in the selection of a bacterial consortium capable of dissimilatory Fe(III) reduction in a long-term continuous culture. The inoculum was a sample of eutrophic lake bottom sediment. Among the bacteria present in this culture were representatives of the Enterobacteriaceae, and the genera Pseudomonas, Arcobacter, and Shewanella. Two non-marine Fe(III)-reducing Shewanella-related clones named POL1 and POL2 were isolated. The abilities of the POL1 and POL2 isolates to metabolize a panel of 190 carbon sources were examined using a BIOLOG assay. The results confirmed the abilities of the shewanellas to utilize a broad range of carbon substrates. The utility of the POL1 and POL2 isolates in H-type MFCs operating on pyruvate or molasses was demonstrated. The operation of the MFC with shewanellas cultured on molasses was shown for the first time. A two-stage character of the fuel cell polarization curves, not previously noted in Shewanella MFC studies, was observed.
Molecular Motor-Powered Shuttles along Multi-walled Carbon Nanotube Tracks
Sikora, Auré,lien,Ramó,n-Azcó,n, Javier,Kim, Kyongwan,Reaves, Kelley,Nakazawa, Hikaru,Umetsu, Mitsuo,Kumagai, Izumi,Adschiri, Tadafumi,Shiku, Hitoshi,Matsue, Tomokazu,Hwang, Wonmuk,T American Chemical Society 2014 NANO LETTERS Vol.14 No.2
<P>As a complementary tool to nanofluidics, biomolecular-based transport is envisioned for nanotechnological devices. We report a new method for guiding microtubule shuttles on multi-walled carbon nanotube tracks, aligned by dielectrophoresis on a functionalized surface. In the absence of electric field and in fluid flow, alignment is maintained. The directed translocation of kinesin propelled microtubules has been investigated using fluorescence microscopy. To our knowledge, this is the first demonstration of microtubules gliding along carbon nanotubes.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-2/nl4042388/production/images/medium/nl-2013-042388_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl4042388'>ACS Electronic Supporting Info</A></P>
Pawel Sikora,Levent Afsar,Sundar Rathnarajan,Morteza Nikravan,정상엽,Dietmar Stephan,Mohamed Abd Elrahman 한국콘크리트학회 2023 International Journal of Concrete Structures and M Vol.17 No.6
The use of alternative and locally available materials is encouraged in the construction industry to improve its sustainability. Desert regions with shortages in freshwater and river sand as fine aggregates in concrete have to search for alternative materials such as seawater, dune sand, and waste glass powder to produce lightweight concretes. The potential negative effects of adding these alternative materials can be reduced by adding nanosilica to the cementitious system at very low quantities. This study evaluates the feasibility of using these alternative materials and nanosilica (NS) in producing lightweight aggregate concretes (LWACs). A systematic study was carried out to understand the synergistic effect of nanosilica and seawater in improving the hydration characteristics of the developed cementitious systems. Also, the effect of these alternative materials on the fresh properties of the cementitious system was assessed by slump flow tests. The evolution of compressive strength at early ages was investigated after 2, 7, and 28 days of moist curing and an improvement in the strength development in concretes with seawater was observed. Furthermore, the integrity of the developed LWACs was analyzed using oven-dry density, thermal conductivity, water porosity and shrinkage measurements. Moreover, the capillary porosity and sorptivity measurements revealed the denser microstructure in the nano-modified seawater lightweight concretes. In the end, the life-cycle assessment study calculated the benefit of alternative materials in terms of carbon footprint and water consumption. As an outcome, a sustainable solution for producing LWACs containing seawater, dune sand or glass powder was proposed.
Serous Adenocarcinoma of Fallopian Tubes: Histological and Immunohistochemical Aspects
Natalia Hyriavenko,Mykola Lyndin,Kateryna Sikora,Artem Piddubnyi,Ludmila Karpenko,Olha Kravtsova,Dmytrii Hyriavenko,Olena Diachenko,Vladyslav Sikora,Anatolii Romaniuk 대한병리학회 2019 Journal of Pathology and Translational Medicine Vol.53 No.4
Background: Although primary cancer of the fallopian tubes is a relatively rare type of tumor in female reproductive organs, its mortality is quite high. It is important to identify molecular and biological markers of this malignancy that determine its specific phenotype. Methods: The study was carried out on samples received from 71 female patients with primary cancer of the fallopian tubes. The main molecular and biological properties, including hormone status (estrogen receptor [ER], progesterone receptor [PR]), human epidermal growth factor receptor (HER2)/neu expression, proliferative potential (Ki-67), apoptosis (p53, Bcl-2), and pro-angiogenic (vascular endothelial growth factor) quality of serous tumors were studied in comparison with clinical and morphological characteristics. Results: ER and PR expression is accompanied by low grade neoplasia, early clinical disease stage, and absence of lymphogenic metastasis (p < .001). HER2/neu expression is not typical for primary cancer of the fallopian tubes. Ki-67 expression is characterized by an inverse correlation with ER and PR (p < .05) and is associated with lymphogenic metastasis (p < .01). p53+ status correlates with high grade malignancy, tumor progression, metastasis, negative ER/PR (p < .001), and negative Bcl-2 status (p < .05). Positive Bcl-2 status is positively correlated with ER and PR expression and low grade malignancy. Conclusions: Complex morphologic (histological and immunohistochemical) study of postoperative material allows estimation of the degree of malignancy and tumor spread to enable appropriate treatment for each case.
Isomorphic coalescence of aster cores formed <i>in vitro</i> from microtubules and kinesin motors
Kim, K,Sikora, A,Nakazawa, H,Umetsu, M,Hwang, W,Teizer, W IOP 2016 Physical Biology Vol.13 No.5
<P>We report fluorescence microscopy studies of the formation of aster-like structures emerging from a cellular element-based active system and a novel analysis of the aster condensation. The system consists of rhodamine labeled microtubules which are dynamically coupled by functionalized kinesin motor proteins cross-linked via streptavidin-coated quantum dots (QDs). The aster-shaped objects contain core structures. The cores are aggregates of the QD-motor protein complexes, and result from the dynamic condensation of sub-clusters that are connected to each other randomly. The structural specificity of the aster core reflects a configuration of the initial connectivity between sub-clusters. Detailed image analysis allows us to extract a novel correlation between the condensation speed and the sub-cluster separation. The size of the core is scaled down during the condensation process, following a power law dependence on the distance between sub-clusters. The exponent of the power law is close to two, as expected from a geometric model. This single exponent common to all the contractile lines implies that there exists a time regime during which an isomorphic contraction of the aster core continues during the condensation process. We analyze the observed contraction by using a model system with potential applicability in a wide range of emergent phenomena in randomly coupled active networks, which are prevalent in the cellular environment.</P>