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Next-generation integrated microfluidic circuits
Mosadegh, Bobak,Bersano-Begey, Tommaso,Park, Joong Yull,Burns, Mark A.,Takayama, Shuichi Royal Society of Chemistry 2011 Lab on a chip Vol.11 No.17
<P>This mini-review provides a brief overview of recent devices that use networks of elastomeric valves to minimize or eliminate the need for interconnections between microfluidic chips and external instruction lines that send flow control signals. Conventional microfluidic control mechanisms convey instruction signals in a parallel manner such that the number of instruction lines must increase as the number of independently operated valves increases. The devices described here circumvent this “tyranny of microfluidic interconnects” by the serial encoding of information to enable instruction of an arbitrary number of independent valves with a set number of control lines, or by the microfluidic circuit-embedded encoding of instructions to eliminate control lines altogether. Because the parallel instruction chips are the most historical and straightforward to design, they are still the most commonly used approach today. As requirements for instruction complexity, chip-to-chip communication, and real-time on-chip feedback flow control arise, the next generation of integrated microfluidic circuits will need to incorporate these latest interconnect flow control approaches.</P> <P>Graphic Abstract</P><P>This mini-review provides an overview of the various approaches of using networks of elastomeric valves for controlling fluid flow in microfluidic devices. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1lc20387h'> </P>
Mosadegh, Bobak,Agarwal, Mayank,Tavana, Hossein,Bersano-Begey, Tommaso,Torisawa, Yu-suke,Morell, Maria,Wyatt, Matthew J.,O'Shea, K. Sue,Barald, Kate F.,Takayama, Shuichi Royal Society of Chemistry 2010 Lab on a chip Vol.10 No.21
<P>Generation of stable soluble-factor gradients in microfluidic devices enables studies of various cellular events such as chemotaxis and differentiation. However, many gradient devices directly expose cells to constant fluid flow and that can induce undesired responses from cells due to shear stress and/or wash out of cell-secreted molecules. Although there have been devices with flow-free gradients, they typically generate only a single condition and/or have a decaying gradient profile that does not accommodate long-term experiments. Here we describe a microdevice that generates several chemical gradient conditions on a single platform in flow-free microchambers which facilitates steady-state gradient profiles. The device contains embedded normally-closed valves that enable fast and uniform seeding of cells to all microchambers simultaneously. A network of microchannels distributes desired solutions from easy-access open reservoirs to a single output port, enabling a simple setup for inducing flow in the device. Embedded porous filters, sandwiched between the microchannel networks and cell microchambers, enable diffusion of biomolecules but inhibit any bulk flow over the cells.</P> <P>Graphic Abstract</P><P>We describe a microdevice that simultaneously generates several gradient conditions in flow-free microchambers separated by normally-closed valves that enable efficient cell seeding. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0lc00086h'> </P>
Stability of a Lattice Preserving Functional Equation on Riesz Space: Fixed Point Alternative
Movahednia, Ehsan,Mosadegh, Seyed Mohammad Sadegh Modarres,Park, Choonkil,Shin, Dong Yun Eudoxus Press LLC 2016 Journal of computational analysis and applications Vol.21 No.1
<P>The aim of this paper is to investigate Hyers-Ulam stability of the following lattice preserving functional equation on Riesz space with fixed point method: parallel to F(tau x boolean OR eta y) - tau F(x) boolean OR eta F(y)parallel to <= phi (tau x boolean OR eta y, tau X Lambda eta y), where chi is a Banach lattice and phi : chi x chi -> chi is a mapping such that phi(x,y) <= (tau eta)(alpha/2) phi (x/tau, y/eta) for all tau, eta >= 1 and alpha is an element of [0,1/2).</P>
Biharmonic hypersurfaces with recurrent operators in the Euclidean space
Esmaiel Abedi,Najma Mosadegh 대한수학회 2022 대한수학회보 Vol.59 No.6
We show how some of well-known recurrent operators such as recurrent curvature operator, recurrent Ricci operator, recurrent Jacobi operator, recurrent shape and Weyl operators have the significant role for biharmonic hypersurfaces to be minimal in the Euclidean space.