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- Andersson, Karl-Magnus, et al.
(författare)
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Interspecific and host-related gene expression patterns in nematode-trapping fungi.
- 2014
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Ingår i: BMC Genomics. - : Springer Science and Business Media LLC. - 1471-2164. ; 15:1
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Tidskriftsartikel (refereegranskat)abstract
- Nematode-trapping fungi are soil-living fungi that capture and kill nematodes using special hyphal structures called traps. They display a large diversity of trapping mechanisms and differ in their host preferences. To provide insights into the genetic basis for this variation, we compared the transcriptome expressed by three species of nematode-trapping fungi (Arthrobotrys oligospora, Monacrosporium cionopagum and Arthrobotrys dactyloides, which use adhesive nets, adhesive branches or constricting rings, respectively, to trap nematodes) during infection of two different plant-pathogenic nematode hosts (the root knot nematode Meloidogyne hapla and the sugar beet cyst nematode Heterodera schachtii).
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| 4. |
- Andersson, Karl-Magnus, et al.
(författare)
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Proteome of the nematode-trapping cells of the fungus Monacrosporium haptotylum.
- 2013
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Ingår i: Applied and Environmental Microbiology. - 0099-2240. ; 79:16, s. 4993-5004
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Tidskriftsartikel (refereegranskat)abstract
- Many nematophagous fungi use morphological structures called traps to capture nematodes by adhesion or mechanically. To better understand the cellular functions of adhesive traps, the trap cell proteome of the fungus Monacrosporium haptotylum was characterized. The trap of M. haptotylum consists of a unicellular structure called knob that develops at the apex of a hyphae. Proteins extracted from knobs and mycelia were analyzed using SDS-PAGE and LC-MS/MS. The peptide sequences were matched against predicted gene models from the recently sequenced M. haptotylum genome. In total, 336 proteins were identified, with 54 being expressed at significantly higher levels in the knobs than in the mycelia. The upregulated knob proteins included peptidases, small secreted proteins with unknown function and putative cell surface adhesins containing carbohydrate-binding domains including the WSC domain. Phylogenetic analysis showed that all upregulated WSC domain proteins belonged to a large, expanded cluster of paralogs in M. haptotylum. Several peptidases and homologs to experimentally verified proteins in other pathogenic fungi were also upregulated in the knob proteome. Complementary profiling of gene expression at the transcriptome level showed poor correlation between the upregulation of knob proteins and their corresponding transcripts. We propose that the traps of M. haptotylum contain many of the proteins needed in the early stages of infection, and that the trap cells can tightly control the translation and degradation of these proteins to minimize the cost of protein synthesis.
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- Andersson, Pontus, 1971, et al.
(författare)
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Nearly complete isobar suppression by photodetachment
- 2010
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Ingår i: Journal of Applied Physics. - : AIP Publishing. - 1089-7550 .- 0021-8979. ; 107:2
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Tidskriftsartikel (refereegranskat)abstract
- The efficiency of selective suppression of negative ions by photodetachment in a gas-filled radio frequency quadrupole ion cooler was investigated with a new detection method. A neodymium doped yttrium aluminum garnet laser beam at 1064 nm was used to remove Co− ions in the radio frequency quadrupole cooler and the remaining ions were then probed by photodetachment and neutral particle detection. More than 99.99% suppression of the Co− ions was observed. Under identical conditions, only 20% of a Ni− beam was suppressed. The results demonstrate that this isobar suppression technique can lead to nearly complete elimination of certain isobaric contaminants in negative ion beams, opening up new experimental possibilities in nuclear and atomic research and accelerator mass spectrometry.
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- Bergsjö, Dag Henrik, 1980, et al.
(författare)
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Industrial Scale Production of Customized Ceramic Prostheses
- 2014
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Ingår i: Advanced Ceramics for Dentistry, 1st Edition. ; , s. 416-
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Today, there are many solutions for dental rehabilitation. A damaged tooth can be replaced with a dental crown, and a toothless patient can be rehabilitated with implants and a corresponding bridge set-up. Traditionally, a dental crown is manufactured by veneering porcelain to a metal surface that is obtained through the use of casting principles. Implant rehabilitations used to rely on a high degree of handcraft by the dentist, where freehand drilling into the jaw- bone was supported by X-ray pictures and was done before implant insertion. Crown and implant rehabilitations can be provided at a much higher degree of industrialization by means of mass customization. The most common dental rehabilitations are crown restorations for single teeth, while full arch implant rehabilitations are the most comprehensive treatments. Trends in industry lean toward a higher degree of automation in production and manufacturing where key characteristics of a well-functioning ceramic prosthesis are cost reduction, patient satisfaction, and quality in both function and perception.
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- Brinkfeldt, Klas, et al.
(författare)
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High temperature packaging for SiC power transistors
- 2012
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Ingår i: Proceedings - 2012 45th International Symposium on Microelectronics, IMAPS 2012. ; , s. 1124-1130
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Konferensbidrag (refereegranskat)abstract
- Power transistors based on silicon carbide (SiC) are now commercially available. They have a higher efficiency and higher voltage blocking capabilities than conventional silicon devices. The wide-band gap and chemical inertness of SiC makes it suitable to high temperature operation. However, there is a need for new packaging for power transistors that can operate in higher temperatures. We have developed a package based on ceramics and silver for high temperature operation of SiC power transistors. Three types of SiC devices from different manufacturers are packaged and tested in room temperature. Though the devices were still functional after the packaging process, their performance seem to have degraded. This could be a result of the high temperature packaging process and the measurement setup. FEM simulations are also performed to investigate the thermo-mechanical behavior of the package. The target operating temperature of the package is 400°C. Modeling show stress concentrations at the corners of the device chip and suggests that this stress is decreased if the substrate metallization is changed from copper to silver.
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| 9. |
- Brinkfeldt, Klas, et al.
(författare)
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Modeling of SiC power modules with double sided cooling
- 2014
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Ingår i: 2014 15th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2014. - : IEEE Computer Society. - 9781479947904
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Konferensbidrag (refereegranskat)abstract
- Silicon Carbide (SiC) based transistor devices have demonstrated higher efficiency switching operation compared to silicon-based, state-of-the-art solutions due to the superior electrical and thermal properties of the SiC material. The improved current density and thermal conductivity allows SiC-based power modules to be smaller than their silicon counterparts for comparable current densities. The active chip area can be reduced further by effectively cooling the devices. In this work, a new power module including SiC bipolar junction transistors (BJT) and diodes and integrated double sided cooling will be introduced. The target application of these modules is a new drive-train system for commercial electric vehicles.
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