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  • 1
    Publication Date: 2019
    Description: 〈p〉Artificial muscles may accelerate the development of robotics, haptics, and prosthetics. Although advances in polymer-based actuators have delivered unprecedented strengths, producing these devices at scale with tunable dimensions remains a challenge. We applied a high-throughput iterative fiber-drawing technique to create strain-programmable artificial muscles with dimensions spanning three orders of magnitude. These fiber-based actuators are thermally and optically controllable, can lift more than 650 times their own weight, and withstand strains of 〉1000%. Integration of conductive nanowire meshes within these fiber-based muscles offers piezoresistive strain feedback and demonstrates long-term resilience across 〉10〈sup〉5〈/sup〉 deformation cycles. The scalable dimensions of these fiber-based actuators and their strength and responsiveness may extend their impact from engineering fields to biomedical applications.〈/p〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2003-07-19
    Description: The principles underlying human hemispheric specialization are poorly understood. We used functional magnetic resonance imaging of letter and visuospatial decision tasks with identical word stimuli to address two unresolved problems. First, hemispheric specialization depended on the nature of the task rather than on the nature of the stimulus. Second, analysis of frontal candidate regions for cognitive control showed increased coupling between left anterior cingulate cortex (ACC) and left inferior frontal gyrus during letter decisions, whereas right ACC showed enhanced coupling with right parietal areas during visuospatial decisions. Cognitive control is thus localized in the same hemisphere as task execution.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stephan, Klaas E -- Marshall, John C -- Friston, Karl J -- Rowe, James B -- Ritzl, Afra -- Zilles, Karl -- Fink, Gereon R -- 077029/Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2003 Jul 18;301(5631):384-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Medicine (IME), Research Centre Julich, 52425 Julich, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12869765" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Brain/*physiology ; Brain Mapping ; *Cognition ; Functional Laterality ; Gyrus Cinguli/physiology ; Humans ; *Language ; Magnetic Resonance Imaging ; Male ; Parietal Lobe/physiology ; Prefrontal Cortex/physiology ; Space Perception ; Visual Perception
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-02-07
    Description: Biofilms are formed by the aggregation of microorganisms into multicellular structures that adhere to surfaces. Here we show that bakers' yeast Saccharomyces cerevisiae can initiate biofilm formation. When grown in low-glucose medium, the yeast cells adhered avidly to a number of plastic surfaces. On semi-solid (0.3% agar) medium they formed "mats": complex multicellular structures composed of yeast-form cells. Both attachment to plastic and mat formation require Flo11p, a member of a large family of fungal cell surface glycoproteins involved in adherence. The ability to study biofilm formation in a tractable genetic system may facilitate the identification of new targets for antifungal therapy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reynolds, T B -- Fink, G R -- 5 RO1 GM40266/GM/NIGMS NIH HHS/ -- GM20565/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2001 Feb 2;291(5505):878-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Whitehead Institute for Biomedical Research and Massachusetts Institute of Technology, Nine Cambridge Center, Cambridge, MA 02142, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11157168" target="_blank"〉PubMed〈/a〉
    Keywords: Agar ; Biofilms/*growth & development ; Cell Adhesion ; Culture Media ; Fungal Proteins/genetics/physiology ; Genes, Fungal ; Glucose ; Lipoproteins/physiology ; MAP Kinase Signaling System/genetics/physiology ; Membrane Glycoproteins ; Membrane Proteins/genetics/physiology ; *Nuclear Proteins ; Peptides/physiology ; Pheromones ; Plastics ; Ploidies ; Saccharomyces cerevisiae/genetics/growth & development/*physiology ; *Saccharomyces cerevisiae Proteins ; Trans-Activators/genetics/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-07-21
    Description: An all-dielectric coaxial waveguide that can overcome problems of polarization rotation and pulse broadening in the transmission of optical light is presented here. It consists of a coaxial waveguiding region with a low index of refraction, bounded by two cylindrical, dielectric, multilayer, omnidirectional reflecting mirrors. The waveguide can be designed to support a single mode whose properties are very similar to the unique transverse electromagnetic mode of a traditional metallic coaxial cable. The new mode has radial symmetry and a point of zero dispersion. Moreover, because the light is not confined by total internal reflection, the waveguide can guide light around very sharp corners.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ibanescu -- Fink -- Fan -- Thomas -- Joannopoulos -- New York, N.Y. -- Science. 2000 Jul 21;289(5478):415-419.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Materials Science and Engineering and Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10903194" target="_blank"〉PubMed〈/a〉
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  • 5
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1999-07-10
    Description: Microarray-based gene expression analysis identified genes showing ploidy-dependent expression in isogenic Saccharomyces cerevisiae strains that varied in ploidy from haploid to tetraploid. These genes were induced or repressed in proportion to the number of chromosome sets, regardless of the mating type. Ploidy-dependent repression of some G1 cyclins can explain the greater cell size associated with higher ploidies, and suggests ploidy-dependent modifications of cell cycle progression. Moreover, ploidy regulation of the FLO11 gene had direct consequences for yeast development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Galitski, T -- Saldanha, A J -- Styles, C A -- Lander, E S -- Fink, G R -- GM35010/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1999 Jul 9;285(5425):251-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Whitehead Institute for Biomedical Research, 9 Cambridge Center, Cambridge, MA 02142, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10398601" target="_blank"〉PubMed〈/a〉
    Keywords: Chitinase/genetics ; Cyclins/genetics ; Fungal Proteins/genetics ; G1 Phase ; *Gene Expression Regulation, Fungal ; Haploidy ; Lipoproteins/genetics/physiology ; Membrane Glycoproteins ; Membrane Proteins/genetics ; Oligonucleotide Array Sequence Analysis ; Peptides/genetics/physiology ; Pheromones ; *Ploidies ; Polyploidy ; Saccharomyces cerevisiae/cytology/*genetics/physiology ; *Saccharomyces cerevisiae Proteins ; Transcription Factors/genetics
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 2002-04-20
    Description: We report the design and fabrication of a multilayered macroscopic fiber preform and the subsequent drawing and optical characterization of extended lengths of omnidirectional dielectric mirror fibers with submicrometer layer thickness. A pair of glassy materials with substantially different indices of refraction, but with similar thermomechanical properties, was used to construct 21 layers of alternating refractive index surrounding a tough polymer core. Large directional photonic band gaps and high reflection efficiencies comparable to those of the best metallic reflectors were obtained. Potential applications of these fibers include woven fabrics for radiation barriers, spectral authentication of cloth, and filters for telecommunications.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hart, Shandon D -- Maskaly, Garry R -- Temelkuran, Burak -- Prideaux, Peter H -- Joannopoulos, John D -- Fink, Yoel -- New York, N.Y. -- Science. 2002 Apr 19;296(5567):510-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11964473" target="_blank"〉PubMed〈/a〉
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1992-07-31
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gimeno, C J -- Fink, G R -- GM35010/GM/NIGMS NIH HHS/ -- GM40266/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1992 Jul 31;257(5070):626.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Whitehead Institute for Biomedical Research, Cambridge, MA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1496375" target="_blank"〉PubMed〈/a〉
    Keywords: *Cell Division ; Diploidy ; Haploidy ; Mitosis ; Saccharomyces cerevisiae/*cytology/growth & development
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1992-09-25
    Description: As part of a program to determine the chemical composition of a sample population of comets, a very unusual comet, Yanaka (1988r), was observed in January 1989. Although the comet showed the usual emissions of Ol and NH(2), it did not display any hint of C(2) or CN emission. The comet is depleted in C(2) by at least a factor of 100 and in CN by a factor of 25 relative to typical comets. If comets originate from interstellar clouds, Yanaka (1988r) could be an interloper from a cloud of different composition. If Yanaka (1988r) was formed within our solar system, the solar nebula was less uniform than assumed by most present models of formation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fink, U -- New York, N.Y. -- Science. 1992 Sep 25;257(5078):1926-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17753496" target="_blank"〉PubMed〈/a〉
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  • 9
    Publication Date: 1989-11-17
    Description: The BAS1 and BAS2 proteins are both required for activation of GCN4-independent (basal) HIS4 transcription in yeast. BAS1 has an NH2-terminal region similar to those of the myb proto-oncogene family. BAS1 and BAS2, which contains a homeo box, bound to adjacent sites on the HIS4 promoter. The joint requirement of BAS1 and BAS2 for activation is probably not due to cooperative binding or the transcriptional control of one of the genes by the other. Although BAS1 and BAS2 were both required for activation of HIS4 transcription, BAS1 was not required for BAS2-dependent expression of the secreted acid phosphatases. The transcriptional activators of HIS4 have DNA binding domains that are conserved in evolution (BAS1 = Myb, BAS2 = homeo box, GCN4 = Jun). Their interactions, therefore, may be relevant to the control of gene expression in more complex systems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tice-Baldwin, K -- Fink, G R -- Arndt, K T -- GM35010/GM/NIGMS NIH HHS/ -- GM39892/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1989 Nov 17;246(4932):931-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cold Spring Harbor Laboratory, NY 11724.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2683089" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Fungal Proteins/*genetics ; *Gene Expression Regulation ; *Genes, Fungal ; Molecular Sequence Data ; Proto-Oncogene Proteins/*genetics ; Proto-Oncogene Proteins c-myb ; Saccharomyces cerevisiae/*genetics ; *Saccharomyces cerevisiae Proteins ; Sequence Homology, Nucleic Acid ; *Trans-Activators ; *Transcription, Genetic
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 1992-02-28
    Description: Many organisms construct structural ceramic (biomineral) composites from seemingly mundane materials; cell-mediated processes control both the nucleation and growth of mineral and the development of composite microarchitecture. Living systems fabricate biocomposites by: (i) confining biomineralization within specific subunit compartments; (ii) producing a specific mineral with defined crystal size and orientation; and (iii) packaging many incremental units together in a moving front process to form fully densified, macroscopic structures. By adapting biological principles, materials scientists are attempting to produce novel materials. To date, neither the elegance of the biomineral assembly mechanisms nor the intricate composite microarchitectures have been duplicated by nonbiological processing. However, substantial progress has been made in the understanding of how biomineralization occurs, and the first steps are now being taken to exploit the basic principles involved.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Heuer, A H -- Fink, D J -- Laraia, V J -- Arias, J L -- Calvert, P D -- Kendall, K -- Messing, G L -- Blackwell, J -- Rieke, P C -- Thompson, D H -- New York, N.Y. -- Science. 1992 Feb 28;255(5048):1098-105.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, OH 44106.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1546311" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bone Matrix ; Calcification, Physiologic ; *Ceramics ; Chickens ; Crystallography
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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