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Micropatterning bacterial suspensions using aqueous two phase systems
Yaguchi, Toshiyuki,Lee, Siseon,Choi, Woon Sun,Kim, Dasol,Kim, Taesung,Mitchell, Robert J.,Takayama, Shuichi Royal Society of Chemistry 2010 The Analyst Vol.135 No.11
<P>Using an aqueous two-phase system comprised of dextran and polyethylene glycol, this article describes the stable spatial patterning of sub-microlitre droplets of bacterial suspensions. Microdroplets of different types of bacterial populations are positioned and maintained adjacent to each other without significant dispersion even though the bacteria are in suspension and not surface bound. Small molecules, in contrast, diffuse relatively freely between the two aqueous phases. The usefulness of these capabilities is demonstrated by generating a small array of suspensions containing different <I>Escherichia coli</I> strains engineered to respond fluorescently or luminescently to different chemical stimuli. When a chemical stimulus is presented, this droplet array produces a pattern of bacterial “illumination” that reflects the type of chemical to which the array was exposed.</P> <P>Graphic Abstract</P><P>Using an aqueous two-phase system, this paper describes spatial patterning of sub-microliter droplets of bacterial suspensions. The droplets can be given chemical stimulation by diffusion between the two aqueous phases. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0an00464b'> </P>
Aqueous Two-Phase System-Derived Biofilms for Bacterial Interaction Studies
Yaguchi, Toshiyuki,Dwidar, Mohammed,Byun, Chang Kyu,Leung, Brendan,Lee, Siseon,Cho, Yoon-Kyoung,Mitchell, Robert J.,Takayama, Shuichi American Chemical Society 2012 Biomacromolecules Vol.13 No.9
<P>We describe patterning of bacterial biofilms using polymer-based aqueous two-phase system (ATPS) microprinting protocols. The fully aqueous but selectively bacteria-partitioning nature of the ATPS allows spatially distinct localization of suspensions of bacteria such as Pseudomonas aeruginosa and Escherichia coli with high precision. The ATPS patterned bacterial suspensions form spatially distinct biofilms over time. Due to the fully aqueous and gentle noncontact printing procedures employed, coculture biofilms composed of multiple types of bacteria could be printed not only adjacent to each other but also directly over another layer of existing biofilm. In addition, the ATPS environment also allows free diffusion of small molecules between spatially distinct and localized bacterial suspensions and biofilms. This enables biofilms to chemically affect or be affected by neighboring biofilms or planktonic cells, even if they consist of different strains or species. We show that a β-lactamase producing biofilm confers ampicillin resistance to neighboring nonresistant planktonic cells, as seen by a 3,600-fold increase in survival of the ampicillin-sensitive strain. These examples demonstrate the ability of ATPS-based biofilm patterning methods to enable unique studies on commensalistic effects between bacterial species.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/bomaf6/2012/bomaf6.2012.13.issue-9/bm300500y/production/images/medium/bm-2012-00500y_0001.gif'></P>
Katsuki Yaguchi,Reiko Kunisaki,Sho Sato,Kaori Hirai,Misato Izumi,Yoshimi Fukuno,Mami Tanaka,Mai Okazaki,Rongrong Wu,Yurika Nishikawa,Yusuke Matsune,Shunsuke Shibui,Yoshinori Nakamori,Masafumi Nishio,M 대한장연구학회 2024 Intestinal Research Vol.22 No.3
Background/Aims: Intestinal Behçet disease is typically associated with ileocecal punched-out ulcers and significant morbidity and mortality. Intestinal ultrasound is a noninvasive imaging technique for disease monitoring. However, no previous reports have compared intestinal ultrasound with endoscopic ulcer activity or histopathological findings for intestinal Behçet disease. We evaluated the usefulness of intestinal ultrasound for assessing the activity of ileocecal ulcers in intestinal Behçet disease.Methods: We retrospectively compared intestinal ultrasound findings with 73 corresponding endoscopic images and 6 resected specimens. The intestinal ultrasound findings were assessed for 7 parameters (bowel wall thickness, vascularity [evaluated using the modified Limberg score with color Doppler], bowel wall stratification, white-plaque sign [strong hyperechogenic lines or spots], mesenteric lymphadenopathy, extramural phlegmons, and fistulas), and endoscopic ulcer activity was classified into active, healing, and scar stages. Histopathological findings were evaluated by consensus among experienced pathologists. Results: Bowel wall thickness (P< 0.001), vascularity (P< 0.001), loss of bowel wall stratification (P= 0.015), and white-plague sign (P= 0.013) were significantly exacerbated in the endoscopic active ulcer stage. Receiver operating characteristic curve analysis revealed that a bowel wall thickness of > 5.5 mm (sensitivity 89.7%, specificity 85.3%) was potentially useful for detecting active lesions. When compared with histopathological findings, an increase in bowel wall thickness reflected the ulcer marginal ridge, and the white-plaque sign reflected the ulcer bottom. Conclusions: Intestinal ultrasound is useful for monitoring intestinal ulcer activity in intestinal Behçet disease.
Kawauchi, Akio,Shimizu, Ayaka,Yaguchi, Yoshiro Department of Mathematics 2019 Kyungpook mathematical journal Vol.59 No.4
For every tree T, we introduce a topological invariant, called the T-cross-index, for connected graphs. The T-cross-index of a graph is a non-negative integer or infinity according to whether T is a tree basis of the graph or not. It is shown how this cross-index is independent of the other topological invariants of connected graphs, such as the Euler characteristic, the crossing number and the genus.
Considerations on Improvement of Moving Properties for Magnetic Actuator Capable of Movement in Pipe
Tomohiro Izumikawa,Hiroyuki Yaguchi 한국자기학회 2011 Journal of Magnetics Vol.16 No.3
The present paper proposes a novel cableless magnetic actuator with a new propulsion module that exhibits a very high thrusting force. This actuator contains an electrical inverter that directly transforms DC from button batteries into AC. The electrical DC-AC inverter incorporates a mass-spring system, a reed switch, and a curved permanent magnet that switches under an electromagnetic force. The actuator is moved by the inertial force of the mass-spring system due to mechanical resonance energy. The experimental results show that the actuator is able to move upward at a speed of 33 ㎜/s when using 10 button batteries when pulling a 10 g load mass. This cableless magnetic actuator has several possible applications, including narrow-pipe inspection and maintenance.