@article{PogorelovaRogachevAkimbekovetal.2024, author = {Pogorelova, Natalia and Rogachev, Evgeniy and Akimbekov, Nuraly S. and Digel, Ilya}, title = {Effect of dehydration method on the micro- and nanomorphological properties of bacterial cellulose produced by Medusomyces gisevii on different substrates}, series = {Journal of materials science}, volume = {2024}, journal = {Journal of materials science}, publisher = {Springer Science + Business Media}, address = {Dordrecht}, issn = {1573-4803 (Online)}, doi = {10.1007/s10853-024-09596-3}, pages = {13 Seiten}, year = {2024}, abstract = {Many important properties of bacterial cellulose (BC), such as moisture absorption capacity, elasticity and tensile strength, largely depend on its structure. This paper presents a study on the effect of the drying method on BC films produced by Medusomyces gisevii using two different procedures: room temperature drying (RT, (24 ± 2 °C, humidity 65 ± 1\%, dried until a constant weight was reached) and freeze-drying (FD, treated at - 75 °C for 48 h). BC was synthesized using one of two different carbon sources—either glucose or sucrose. Structural differences in the obtained BC films were evaluated using atomic force microscopy (AFM), scanning electron microscopy (SEM), and X-ray diffraction. Macroscopically, the RT samples appeared semi-transparent and smooth, whereas the FD group exhibited an opaque white color and sponge-like structure. SEM examination showed denser packing of fibrils in FD samples while RT-samples displayed smaller average fiber diameter, lower surface roughness and less porosity. AFM confirmed the SEM observations and showed that the FD material exhibited a more branched structure and a higher surface roughness. The samples cultivated in a glucose-containing nutrient medium, generally displayed a straight and ordered shape of fibrils compared to the sucrose-derived BC, characterized by a rougher and wavier structure. The BC films dried under different conditions showed distinctly different crystallinity degrees, whereas the carbon source in the culture medium was found to have a relatively small effect on the BC crystallinity.}, language = {en} } @article{PogorelovaRogachevDigeletal.2020, author = {Pogorelova, Natalia and Rogachev, Evgeniy and Digel, Ilya and Chernigova, Svetlana and Nardin, Dmitry}, title = {Bacterial Cellulose Nanocomposites: Morphology and Mechanical Properties}, series = {Materials}, volume = {13}, journal = {Materials}, number = {12}, publisher = {MDPI}, address = {Basel}, isbn = {1996-1944}, doi = {10.3390/ma13122849}, pages = {1 -- 16}, year = {2020}, abstract = {Bacterial cellulose (BC) is a promising material for biomedical applications due to its unique properties such as high mechanical strength and biocompatibility. This article describes the microbiological synthesis, modification, and characterization of the obtained BC-nanocomposites originating from symbiotic consortium Medusomyces gisevii. Two BC-modifications have been obtained: BC-Ag and BC-calcium phosphate (BC-Ca3(PO4)2). Structure and physicochemical properties of the BC and its modifications were investigated by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), and infrared Fourier spectroscopy as well as by measurements of mechanical and water holding/absorbing capacities. Topographic analysis of the surface revealed multicomponent thick fibrils (150-160 nm in diameter and about 15 µm in length) constituted by 50-60 nm nanofibrils weaved into a left-hand helix. Distinctive features of Ca-phosphate-modified BC samples were (a) the presence of 500-700 nm entanglements and (b) inclusions of Ca3(PO4)2 crystals. The samples impregnated with Ag nanoparticles exhibited numerous roundish inclusions, about 110 nm in diameter. The boundaries between the organic and inorganic phases were very distinct in both cases. The Ag-modified samples also showed a prominent waving pattern in the packing of nanofibrils. The obtained BC gel films possessed water-holding capacity of about 62.35 g/g. However, the dried (to a constant mass) BC-films later exhibited a low water absorption capacity (3.82 g/g). It was found that decellularized BC samples had 2.4 times larger Young's modulus and 2.2 times greater tensile strength as compared to dehydrated native BC films. We presume that this was caused by molecular compaction of the BC structure.}, language = {en} } @article{PohlSiegertMeschetal.1998, author = {Pohl, Martina and Siegert, Petra and Mesch, K. and Bruhn, H. and Gr{\"o}tzinger, Joachim}, title = {Active site mutants of pyruvate decarboxylase from Zymomonas mobilis : a site-directed mutagenesis study of L112, I472, I476, E473 and N482}, series = {European journal of biochemistry}, volume = {Vol. 257}, journal = {European journal of biochemistry}, number = {Iss. 3}, issn = {1432-1033 (E-Journal); 1742-4658 (E-Journal); 0014-2956 (Print); 1742-464X (Print)}, pages = {538 -- 546}, year = {1998}, language = {en} } @inproceedings{PohleFroehlichDalitzRichteretal.2020, author = {Pohle-Fr{\"o}hlich, Regina and Dalitz, Christoph and Richter, Charlotte and Hahnen, Tobias and St{\"a}udle, Benjamin and Albracht, Kirsten}, title = {Estimation of muscle fascicle orientation in ultrasonic images}, series = {Proceedings of the 15th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications - Volume 5}, booktitle = {Proceedings of the 15th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications - Volume 5}, publisher = {SciTePress}, address = {Set{\´u}bal, Portugal}, isbn = {978-989-758-402-2}, doi = {10.5220/0008933900790086}, pages = {79 -- 86}, year = {2020}, abstract = {We compare four different algorithms for automatically estimating the muscle fascicle angle from ultrasonic images: the vesselness filter, the Radon transform, the projection profile method and the gray level cooccurence matrix (GLCM). The algorithm results are compared to ground truth data generated by three different experts on 425 image frames from two videos recorded during different types of motion. The best agreement with the ground truth data was achieved by a combination of pre-processing with a vesselness filter and measuring the angle with the projection profile method. The robustness of the estimation is increased by applying the algorithms to subregions with high gradients and performing a LOESS fit through these estimates.}, language = {en} } @misc{Polaczek1983, author = {Polaczek, Christa}, title = {Kofaser - Kategorien und differentielle Algebren}, publisher = {Math. Inst. der Univ.}, address = {Bonn}, pages = {178 S. : Anh.}, year = {1983}, language = {de} } @phdthesis{Polaczek1995, author = {Polaczek, Christa}, title = {Automatische 3-dimensionale FEM-Netzgenerierung f{\"u}r die Formf{\"u}ll- und Erstarrungssimulation. - (Fortschrittberichte VDI : Reihe 20, Rechnerunterst{\"u}tzte Verfahren ; 182)}, number = {Als Ms. gedr.}, publisher = {VDI-Verl.}, address = {D{\"u}sseldorf}, isbn = {3-18-318220-3}, pages = {VII, 131 S. : Ill., graph. Darst.}, year = {1995}, language = {de} } @article{PolaczekHenn2008, author = {Polaczek, Christa and Henn, Gudrun}, title = {Gute Vorkenntnisse verk{\"u}rzen die Studienzeit}, series = {Mathematikinformation : eine Zeitschrift von Begabtenf{\"o}rderung Mathematik e.V.}, volume = {2008}, journal = {Mathematikinformation : eine Zeitschrift von Begabtenf{\"o}rderung Mathematik e.V.}, number = {49}, publisher = {Begabtenf{\"o}rderung Mathematik}, address = {Neubiberg}, issn = {1612-9156}, pages = {46 -- 50}, year = {2008}, language = {de} } @article{PolenKraemerBongaertsetal.2005, author = {Polen, T. and Kr{\"a}mer, Marco and Bongaerts, Johannes and Wubbolts, Marcel and Wendisch, V. F.}, title = {The global gene expression response of Escherichia coli to L-phenylalanine}, series = {Journal of biotechnology}, volume = {Vol. 115}, journal = {Journal of biotechnology}, number = {Iss. 3}, issn = {1873-4863 (E-Journal); 0168-1656 (Print)}, pages = {221 -- 237}, year = {2005}, language = {en} } @book{Polumsky1987, author = {Polumsky, Dieter}, title = {Erweiterungsm{\"o}glichkeiten des Verkehrsplanungsalgorithmus}, publisher = {Inst. f{\"u}r Stadtbauwesen, RWTH}, address = {Aachen}, isbn = {3-88354-114-1}, pages = {X, 200 S. : graph. Darst., Kt.}, year = {1987}, language = {de} } @book{Polumsky2001, author = {Polumsky, Dieter}, title = {Hinweise auf Verfahren bei Verkehrsplanungen im Personenverkehr / Forschungsgesellschaft f{\"u}r Straßen- und Verkehrswesen, Arbeitsgruppe Verkehrsplanung. [Arbeitsgruppe Verkehrsplanung, Arbeitsausschuss: Erhebung und Voraussch{\"a}tzung des Verkehrs, Arbeitskre}, publisher = {FGSV-Verl.}, address = {K{\"o}ln}, pages = {27 S. : graph. Darst.}, year = {2001}, language = {de} } @book{Polumsky1988, author = {Polumsky, Dieter}, title = {Zusammenschau der modelltechnischen Erweiterungsm{\"o}glichkeiten des Algorithmus der Verkehrsplanung : insbesondere unter dem Aspekt der Bindungen durch Haushalt und Familie}, pages = {X, 200 S.}, year = {1988}, language = {de} } @article{Polumsky2001, author = {Polumsky, Dieter}, title = {Kann man Verkehrsplanung verst{\"a}ndlich machen?}, series = {Straßenverkehrstechnik. 45 (2001), H. 6}, journal = {Straßenverkehrstechnik. 45 (2001), H. 6}, isbn = {0039-2219}, pages = {287 -- 293}, year = {2001}, language = {de} } @book{Polumsky1978, author = {Polumsky, Dieter}, title = {Ordnende, verkehrsregelnde und bauliche Elemente f{\"u}r den Einsatz zur Verkehrsberuhigung in Wohngebieten. Planungsheft. Baier, Reinhold [Bearb.] ... Polumsky, Dieter [Bearb.] TH Aachen, Institut f{\"u}r Stadtbauwesen (Hrsg.)}, publisher = {Selbstverlag}, address = {Aachen}, pages = {143 S.}, year = {1978}, language = {de} } @article{Polumsky1981, author = {Polumsky, Dieter}, title = {Pr{\"a}missen und Methoden bei großr{\"a}umigen Verkehrsprognosen}, publisher = {Inst.}, address = {Aachen}, pages = {67 -- 75}, year = {1981}, language = {de} } @book{Polumsky1976, author = {Polumsky, Dieter}, title = {Zentralit{\"a}tsaspekte im regionalen Reiseverhalten : M{\"o}glichkeiten zur Differenzierung der Modelle f{\"u}r Verkehrserzeugung und Verkehrsverteilung}, publisher = {Selbstverl. am Inst. f{\"u}r Stadtbauwesen, RWTH}, address = {Aachen}, pages = {XVII, 279 S. : graph. Darst., Kt.}, year = {1976}, language = {de} } @book{Polumsky1986, author = {Polumsky, Dieter}, title = {Dynamisierung von Verkehrsumlegungsmodellen / Projektleiter: D. Polumsky}, publisher = {Inst. f{\"u}r Stadtbauwesen, RWTH}, address = {Aachen}, isbn = {3-88354-111-7}, pages = {III, 145 S. : {\"u}berwiegend graph. Darst., Kt.}, year = {1986}, language = {de} } @article{Polumsky1979, author = {Polumsky, Dieter}, title = {DIVA - Datenbankorientierter - Interaktiver - Verkehrs-Algorithmus / M{\"a}cke, Paul A. [Hrsg.]}, publisher = {Inst.}, address = {Aachen}, isbn = {3-88354-076-5}, pages = {77 -- 95}, year = {1979}, language = {de} } @book{Polumsky1977, author = {Polumsky, Dieter}, title = {Analyse und Prognose des G{\"u}terverkehrs im Raum Mittelrhein / Rothschuh, Bruno [Mitarb.] ... Polumsky, Dieter [Mitarb.]}, publisher = {Selbstverl.}, address = {Aachen}, isbn = {3-88354-057-9}, pages = {ca. 260 S.}, year = {1977}, language = {de} } @article{PolumskyEckelmann1984, author = {Polumsky, Dieter and Eckelmann, Marion}, title = {Zentralit{\"a}tsgef{\"u}ge der Raumordnung in Abh{\"a}ngigkeit von Erreichbarkeiten}, series = {Stadt und Gemeinde. 39 (1984), H. 10}, journal = {Stadt und Gemeinde. 39 (1984), H. 10}, isbn = {0342-7706}, pages = {493 -- 496}, year = {1984}, language = {de} } @book{PolumskyEckelmannRatsch1985, author = {Polumsky, Dieter and Eckelmann, Marion and Ratsch, Birgit}, title = {Das Zentralit{\"a}tsgef{\"u}ge der Raumordnung in Abh{\"a}ngigkeit von Erreichbarkeiten / Bearb.: Marion Eckelmann ; Dieter Polumsky ; Birgit Ratsch}, publisher = {Inst. f{\"u}r Stadtbauwesen, RWTH}, address = {Aachen}, isbn = {3-88354-110-9}, pages = {222 S. : zahlr. graph. Darst., Kt.}, year = {1985}, language = {de} }