| 11. |
- Granström, Magnus, et al.
(författare)
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Micrometer- and Nanometer-Sized Polymeric Light-Emitting Diodes
- 1995
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Ingår i: Science. - : American Association for the Advancement of Science. - 0036-8075 .- 1095-9203. ; 267:5203, s. 1479-1481
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Tidskriftsartikel (refereegranskat)abstract
- A method for the fabrication of micrometer- and submicrometer-sized polymeric light-emitting diodes is presented. Such diodes have a variety of applications. Light sources of dimensions around 100 nanometers are required for subwavelength, near-field optical microscopy. Another possible application is patterning on the micrometer and nanometer scale. The diodes have been made in the form of a sandwich structure, with the conductive polymer poly(3,4-ethylene-dioxythiophene) polymerized in the pores of commercially available microfiltration membranes defining the hole-injecting contacts, poly[3-(4-octylphenyl)-2,2-bithiophene] as the light-omitting layer, and a thin film of calcium-aluminum as the electron injector.
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| 12. |
- Hemmungs Wirtén, Eva
(författare)
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The making and remaking of Marie Curie
- 2017
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Ingår i: Science. - : AMER ASSOC ADVANCEMENT SCIENCE. - 0036-8075 .- 1095-9203. ; 358:6363, s. 599-600
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Recension (övrigt vetenskapligt/konstnärligt)abstract
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| 13. |
- Hiruma, Yoshitaka, et al.
(författare)
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Competition between MPS1 and microtubules at kinetochores regulates spindle checkpoint signaling
- 2015
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Ingår i: Science. - Washington, DC, United States : American Association for the Advancement of Science (A A A S). - 0036-8075 .- 1095-9203. ; 348:6240, s. 1264-1267
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Tidskriftsartikel (refereegranskat)abstract
- Cell division progresses to anaphase only after all chromosomes are connected to spindle microtubules through kinetochores and the spindle assembly checkpoint (SAC) is satisfied. We show that the amino-terminal localization module of the SAC protein kinase MPS1 (monopolar spindle 1) directly interacts with the HEC1 (highly expressed in cancer 1) calponin homology domain in the NDC80 (nuclear division cycle 80) kinetochore complex in vitro, in a phosphorylation-dependent manner. Microtubule polymers disrupted this interaction. In cells, MPS1 binding to kinetochores or to ectopic NDC80 complexes was prevented by end-on microtubule attachment, independent of known kinetochore protein-removal mechanisms. Competition for kinetochore binding between SAC proteins and microtubules provides a direct and perhaps evolutionarily conserved way to detect a properly organized spindle ready for cell division.
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| 14. |
- Hulme, Mike, et al.
(författare)
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Letter: Science-Policy Interface: Beyond Assessments
- 2011
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Ingår i: Science. - : American Association for the Advancement of Science. - 0036-8075 .- 1095-9203. ; 333:6043, s. 697-698
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 15. |
- Jacobson, Ken, et al.
(författare)
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Lipid flow in locomoting cells : Response
- 1991
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Ingår i: Science. - : American Association for the Advancement of Science. - 0036-8075 .- 1095-9203. ; 251:4991, s. 318-318
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Tidskriftsartikel (refereegranskat)abstract
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| 16. |
- Jager, EWH, et al.
(författare)
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Microfabricating conjugated polymer actuators
- 2000
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Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 290:5496, s. 1540-1545
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Forskningsöversikt (refereegranskat)abstract
- Conjugated polymer actuators can be operated in aqueous media, which makes them attractive for laboratories-on-a-chip and applications under physiological conditions. One of the most stable conjugated polymers under these conditions is polypyrrole, which can be patterned by means of standard photolithography. Polypyrrole-gold bilayer actuators that bend out of the plane of the wafer have been microfabricated in our laboratory. These can be used to move and position other microcomponents. Here we review the current status of these microactuators, outlining the methods used to fabricate them. We describe the devices that have been demonstrated as well as some potential future applications.
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| 17. |
- Jager, Edwin, 1973-, et al.
(författare)
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Microrobots for Micrometer-Size Objects in Aqueous Media : Potential Tools for Single-Cell Manipulation
- 2000
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Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 288:5475, s. 2335-2338
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Tidskriftsartikel (refereegranskat)abstract
- Conducting polymers are excellent materials for actuators that are operated in aqueous media. Microactuators based on polypyrrole-goldbilayers enable large movement of structures attached to theseactuators and are of particular interest for the manipulationof biological objects, such as single cells. A fabrication methodfor creating individually addressable and controllable polypyrrole-goldmicroactuators was developed. With these individually controlledmicroactuators, a micrometer-size manipulator, or microroboticarm, was fabricated. This microrobotic arm can pick up, lift,move, and place micrometer-size objects within an area of about250 micrometers by 100 micrometers, making the microrobot an excellenttool for single-cell manipulation.
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| 18. |
- Lee, Juliet, et al.
(författare)
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The direction of membrane lipid flow in locomoting polymorphonuclear leukocytes
- 1990
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Ingår i: Science. - : American Association for the Advancement of Science. - 0036-8075 .- 1095-9203. ; 247:4947, s. 1229-1233
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Tidskriftsartikel (refereegranskat)abstract
- The objective of this study was to determine the direction of membrane lipid flow in locomoting cells. The plasma membrane of human polymorphonuclear leukocytes was stained with a fluorescent lipid analog dihexadecanoyl indocarbocyanine. A line was photobleached on the cell surface perpendicular to the direction of cell motion. Low-light-level fluorescence microscopy and digital image-processing techniques were used to analyze a series of images taken at short intervals after photobleaching. The bleached line remained visible for about 5 seconds before being erased by diffusional recovery. Examination of fluorescence intensity profiles allowed a comparison to be made between the velocities of line and cell movement. Results indicate that the bleached line moves forward with the same velocity as the cell during locomotion, refuting the retrograde lipid flow model of locomotion. Instead, the plasma membrane lipid appears to move forward according to either the unit movement of membrane or the tank track model of locomotion.
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| 19. |
- Lin, Yen-Hung, et al.
(författare)
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A piperidinium salt stabilizes efficient metal-halide perovskite solar cells
- 2020
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Ingår i: Science. - : AMER ASSOC ADVANCEMENT SCIENCE. - 0036-8075 .- 1095-9203. ; 369:6499, s. 96-
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Tidskriftsartikel (refereegranskat)abstract
- Longevity has been a long-standing concern for hybrid perovskite photovoltaics. We demonstrate high-resilience positive-intrinsic-negative perovskite solar cells by incorporating a piperidinium-based ionic compound into the formamidinium-cesium lead-trihalide perovskite absorber. With the bandgap tuned to be well suited for perovskite-on-silicon tandem cells, this piperidinium additive enhances the open-circuit voltage and cell efficiency. This additive also retards compositional segregation into impurity phases and pinhole formation in the perovskite absorber layer during aggressive aging. Under full-spectrum simulated sunlight in ambient atmosphere, our unencapsulated and encapsulated cells retain 80 and 95% of their peak and post-burn-in efficiencies for 1010 and 1200 hours at 60 degrees and 85 degrees C, respectively. Our analysis reveals detailed degradation routes that contribute to the failure of aged cells.
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| 20. |
- Lindskog, Per, 1945-
(författare)
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How to Cut World Hunger in Half
- 2005
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Ingår i: Science. - 0036-8075 .- 1095-9203. ; 310, s. 1768-1768
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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