1
|
Schreiber T, Prange A, Schäfer P, Iwen T, Grützner R, Marillonnet S, Lepage A, Javelle M, Paul W, Tissier A. Efficient scar-free knock-ins of several kilobases in plants by engineered CRISPR-Cas endonucleases. Mol Plant 2024:S1674-2052(24)00086-8. [PMID: 38520090 DOI: 10.1016/j.molp.2024.03.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 02/28/2024] [Accepted: 03/20/2024] [Indexed: 03/25/2024]
Abstract
In plants and mammals, non-homologous end-joining is the dominant pathway to repair DNA double-strand breaks, making it challenging to generate knock-in events. In this study, we identified two groups of exonucleases from the herpes virus and the bacteriophage T7 families that conferred an up to 38-fold increase in homology-directed repair frequencies when fused to Cas9/Cas12a in a tobacco mosaic virus-based transient assay in Nicotiana benthamiana. We achieved precise and scar-free insertion of several kilobases of DNA both in transient and stable transformation systems. In Arabidopsis thaliana, fusion of Cas9 to a herpes virus family exonuclease led to 10-fold higher frequencies of knock-ins in the first generation of transformants. In addition, we demonstrated stable and heritable knock-ins in wheat in 1% of the primary transformants. Taken together, our results open perspectives for the routine production of heritable knock-in and gene replacement events in plants.
Collapse
Affiliation(s)
- Tom Schreiber
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany
| | - Anja Prange
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany
| | - Petra Schäfer
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany
| | - Thomas Iwen
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany
| | - Ramona Grützner
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany
| | - Sylvestre Marillonnet
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany
| | - Aurélie Lepage
- Limagrain, Centre de Recherche, Route d'Ennezat, CS 90126, 63720 Chappes, France
| | - Marie Javelle
- Limagrain, Centre de Recherche, Route d'Ennezat, CS 90126, 63720 Chappes, France
| | - Wyatt Paul
- Limagrain, Centre de Recherche, Route d'Ennezat, CS 90126, 63720 Chappes, France
| | - Alain Tissier
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany.
| |
Collapse
|
2
|
Friedman B, Barth S, Schreiber T, Bartzsch H, Bain J, Piazza G. Measured optical losses of Sc doped AlN waveguides. Opt Express 2024; 32:5252-5260. [PMID: 38439257 DOI: 10.1364/oe.511606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Accepted: 01/03/2024] [Indexed: 03/06/2024]
Abstract
Although Sc doped AlN (ScAlN) has been used extensively in micro-electro-mechanical systems (MEMS) devices and more recently in optical devices, there have not been thorough studies of its intrinsic optical losses. Here we explore the optical losses of the Sc0.30Al0.70N waveguide system by observing racetrack resonator waveguide quality factors. Using a partial physical etch, we fabricate waveguides and extract propagation losses as low as 1.6 ± 0.3 dB/cm at wavelengths around 1550 nm, mostly dominated by intrinsic material absorption from the Sc0.30Al0.70N thin film layer. The highest quality factor of the resonators was greater than 87,000. The propagation loss value is lower than any value previously published and shows that this material can be broadly used in optical modulators without significant loss.
Collapse
|
3
|
Schindele P, Merker L, Schreiber T, Prange A, Tissier A, Puchta H. Enhancing gene editing and gene targeting efficiencies in Arabidopsis thaliana by using an intron-containing version of ttLbCas12a. Plant Biotechnol J 2023; 21:457-459. [PMID: 36382936 PMCID: PMC9946132 DOI: 10.1111/pbi.13964] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 11/04/2022] [Accepted: 11/11/2022] [Indexed: 06/16/2023]
Affiliation(s)
- Patrick Schindele
- Botanical InstituteKarlsruhe Institute of TechnologyKarlsruheGermany
| | - Laura Merker
- Botanical InstituteKarlsruhe Institute of TechnologyKarlsruheGermany
| | - Tom Schreiber
- Department of Cell and Metabolic BiologyLeibniz Institute of Plant BiochemistryHalle (Saale)Germany
| | - Anja Prange
- Department of Cell and Metabolic BiologyLeibniz Institute of Plant BiochemistryHalle (Saale)Germany
| | - Alain Tissier
- Department of Cell and Metabolic BiologyLeibniz Institute of Plant BiochemistryHalle (Saale)Germany
| | - Holger Puchta
- Botanical InstituteKarlsruhe Institute of TechnologyKarlsruheGermany
| |
Collapse
|
4
|
Barth S, Schreiber T, Cornelius S, Zywitzki O, Modes T, Bartzsch H. High Rate Deposition of Piezoelectric AlScN Films by Reactive Magnetron Sputtering from AlSc Alloy Targets on Large Area. Micromachines (Basel) 2022; 13:mi13101561. [PMID: 36295914 PMCID: PMC9610784 DOI: 10.3390/mi13101561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 09/07/2022] [Accepted: 09/13/2022] [Indexed: 06/01/2023]
Abstract
This paper reports on the deposition and characterization of piezoelectric AlXSc1-XN (further: AlScN) films on Si substrates using AlSc alloy targets with 30 at.% Sc. Films were deposited on a Ø200 mm area with deposition rates of 200 nm/min using a reactive magnetron sputtering process with a unipolar-bipolar hybrid pulse mode of FEP. The homogeneity of film composition, structural properties and piezoelectric properties were investigated depending on process parameters, especially the pulse mode of powering in unipolar-bipolar hybrid pulse mode operation. Characterization methods include energy-dispersive spectrometry of X-ray (EDS), X-ray diffraction (XRD), piezoresponse force microscopy (PFM) and double-beam laser interferometry (DBLI). The film composition was Al0.695Sc0.295N. The films showed good homogeneity of film structure with full width at half maximum (FWHM) of AlScN(002) rocking curves at 2.2 ± 0.1° over the whole coating area when deposited with higher share of unipolar pulse mode during film growth. For a higher share of bipolar pulse mode, the films showed a much larger c-lattice parameter in the center of the coating area, indicating high in-plane compressive stress in the films. Rocking curve FWHM also showed similar values of 1.5° at the center to 3° at outer edge. The piezoelectric characterization method revealed homogenous d33,f of 11-12 pm/V for films deposited at a high share of unipolar pulse mode and distribution of 7-10 pm/V for a lower share of unipolar pulse mode. The films exhibited ferroelectric switching behavior with coercive fields of around 3-3.5 MV/cm and polarization of 80-120 µC/cm².
Collapse
|
5
|
Danila F, Schreiber T, Ermakova M, Hua L, Vlad D, Lo S, Chen Y, Lambret‐Frotte J, Hermanns AS, Athmer B, von Caemmerer S, Yu S, Hibberd JM, Tissier A, Furbank RT, Kelly S, Langdale JA. A single promoter-TALE system for tissue-specific and tuneable expression of multiple genes in rice. Plant Biotechnol J 2022; 20:1786-1806. [PMID: 35639605 PMCID: PMC9398400 DOI: 10.1111/pbi.13864] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 05/06/2022] [Accepted: 05/26/2022] [Indexed: 06/15/2023]
Abstract
In biological discovery and engineering research, there is a need to spatially and/or temporally regulate transgene expression. However, the limited availability of promoter sequences that are uniquely active in specific tissue-types and/or at specific times often precludes co-expression of multiple transgenes in precisely controlled developmental contexts. Here, we developed a system for use in rice that comprises synthetic designer transcription activator-like effectors (dTALEs) and cognate synthetic TALE-activated promoters (STAPs). The system allows multiple transgenes to be expressed from different STAPs, with the spatial and temporal context determined by a single promoter that drives expression of the dTALE. We show that two different systems-dTALE1-STAP1 and dTALE2-STAP2-can activate STAP-driven reporter gene expression in stable transgenic rice lines, with transgene transcript levels dependent on both dTALE and STAP sequence identities. The relative strength of individual STAP sequences is consistent between dTALE1 and dTALE2 systems but differs between cell-types, requiring empirical evaluation in each case. dTALE expression leads to off-target activation of endogenous genes but the number of genes affected is substantially less than the number impacted by the somaclonal variation that occurs during the regeneration of transformed plants. With the potential to design fully orthogonal dTALEs for any genome of interest, the dTALE-STAP system thus provides a powerful approach to fine-tune the expression of multiple transgenes, and to simultaneously introduce different synthetic circuits into distinct developmental contexts.
Collapse
Affiliation(s)
- Florence Danila
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Plant Sciences Division, Research School of BiologyAustralian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Tom Schreiber
- Department of Cell and Metabolic BiologyLeibniz Institute of Plant BiochemistryHalleGermany
| | - Maria Ermakova
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Plant Sciences Division, Research School of BiologyAustralian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Lei Hua
- Department of Plant SciencesUniversity of CambridgeCambridgeUK
| | - Daniela Vlad
- Department of Plant SciencesUniversity of OxfordOxfordUK
| | - Shuen‐Fang Lo
- Biotechnology CenterNational Chung Hsing UniversityTaichungTaiwan
| | - Yi‐Shih Chen
- Institute of Molecular BiologyAcademia SinicaTaipeiTaiwan
| | | | - Anna S. Hermanns
- Department of Plant SciencesUniversity of OxfordOxfordUK
- Present address:
Plant Breeding and Genetics Section, School of Integrative Plant ScienceCornell UniversityIthacaNew YorkUSA
| | - Benedikt Athmer
- Department of Cell and Metabolic BiologyLeibniz Institute of Plant BiochemistryHalleGermany
| | - Susanne von Caemmerer
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Plant Sciences Division, Research School of BiologyAustralian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Su‐May Yu
- Biotechnology CenterNational Chung Hsing UniversityTaichungTaiwan
- Institute of Molecular BiologyAcademia SinicaTaipeiTaiwan
| | | | - Alain Tissier
- Department of Cell and Metabolic BiologyLeibniz Institute of Plant BiochemistryHalleGermany
| | - Robert T. Furbank
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Plant Sciences Division, Research School of BiologyAustralian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Steven Kelly
- Department of Plant SciencesUniversity of OxfordOxfordUK
| | | |
Collapse
|
6
|
Goebel TA, Nold J, Hupel C, Kuhn S, Haarlammert N, Schreiber T, Matzdorf C, Imogore TO, Krämer RG, Richter D, Tünnermann A, Nolte S. Ultrashort pulse written fiber Bragg gratings as narrowband filters in multicore fibers. Appl Opt 2021; 60:D43-D51. [PMID: 34263827 DOI: 10.1364/ao.421089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 04/13/2021] [Indexed: 06/13/2023]
Abstract
We present the inscription of narrow-linewidth fiber Bragg gratings (FBGs) into different types of multicore fibers (MCFs) using ultrashort laser pulses and the phase mask technique, which can act as notch filters. Such filters are required, e.g., to suppress light emitted by hydroxyl in the Earth's upper atmosphere, which disturbs ground-based observation of extraterrestrial objects in the near infrared. However, the inscription into a commercially available seven-core fiber showed a quite large core-to-core deviation of the resonance wavelength of up to 0.45 nm. Two options are presented to overcome this: first, we present the photo-treatment of the FBGs to tune the resonance wavelength, which allows for sufficient resonance shifts. Second, adapted MCFs containing 12 cores, arranged on a circle, are fabricated. For this, two different fabrication procedures were investigated, namely, the mechanical drilling of the preform for a rod-in-tube version as well as a stack-and-draw approach. Both adapted MCFs yielded significant improvements with core-to-core wavelength variations of the FBGs of only about 0.18 nm and 0.11 nm, respectively, sufficient to fulfill the requirements for astronomical filter applications as discussed above.
Collapse
|
7
|
Schreiber T, Kähler N, Biewener S, Tscholl V, Nagel P, Attanasio P, Landmesser U, Huemer M. Results from a real-time dosimetry study during left atrial ablations performed with ultra-low dose radiation settings. Herzschrittmacherther Elektrophysiol 2021; 32:244-249. [PMID: 33977306 PMCID: PMC8166725 DOI: 10.1007/s00399-021-00762-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Accepted: 04/12/2021] [Indexed: 11/27/2022]
Abstract
Background Three-dimensional mapping systems and the use of ultra-low dose radiation protocols have supported minimization of radiation dose during left atrial ablation procedures. By using optimal shielding, scattered radiation reaching the operator can be further reduced. This prospective study was designed to determine the remaining operator radiation exposure during left atrial catheter ablations using real-time dosimetry. Methods Radiation dose was recorded using real-time digital dosimetry badges outside the lead apron during 201 consecutive left atrial fibrillation ablation procedures. All procedures were performed using the same X‑ray system (Siemens Healthineers Artis dBc; Siemens Healthcare AG, Erlangen, Germany) programmed with ultra-low dose radiation settings including a low frame rate (two frames per second), maximum copper filtration, and an optimized detector dose. To reduce scattered radiation to the operators, table-suspended lead curtains, ceiling-suspended leaded plastic shields, and radiation-absorbing shields on the patient were positioned in an overlapping configuration. Results The 201 procedures included 139 (69%) pulmonary vein isolations (PVI) (20 cryoballoon ablations, 119 radiofrequency ablations, with 35 cases receiving additional ablation of the cavotricuspid isthmus) and 62 (31%) PVI plus further left atrial substrate ablation. Mean radiation dose measured as dose area product for all procedures was 128.09 ± 187.87 cGy ∙ cm2 with a mean fluoroscopy duration of 9.4 ± 8.7 min. Real-time dosimetry showed very low average operator doses of 0.52 ± 0.10 µSv. A subanalysis of 51 (25%) procedures showed that the radiation burden for the operator was highest during pulmonary vein angiography. Conclusion The use of ultra-low dose radiation protocols in combination with optimized shielding results in extremely low scattered radiation reaching the operator.
Collapse
Affiliation(s)
- T Schreiber
- Department of Cardiology, Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 3, 12203, Berlin, Germany.
| | - N Kähler
- Department of Cardiology, Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 3, 12203, Berlin, Germany
| | - S Biewener
- Department of Cardiology, Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 3, 12203, Berlin, Germany
| | - V Tscholl
- Department of Cardiology, Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 3, 12203, Berlin, Germany
| | - P Nagel
- Department of Cardiology, Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 3, 12203, Berlin, Germany
| | - P Attanasio
- Department of Cardiology, Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 3, 12203, Berlin, Germany
| | - U Landmesser
- Department of Cardiology, Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 3, 12203, Berlin, Germany
| | - M Huemer
- Department of Cardiology, Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 3, 12203, Berlin, Germany
| |
Collapse
|
8
|
Bahmer T, Wälscher J, Fisser C, Groth EE, Schreiber T, Koch M, Raspe M. [Young Respiratory Physicians in Germany - Current Situation and Future Perspectives]. Pneumologie 2021; 75:761-775. [PMID: 33853133 DOI: 10.1055/a-1397-6275] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
BACKGROUND Demographic changes in the society and among doctors, as well as changing attitudes towards and norms of how living should be structured are creating challenges regarding the organization of work environment in the hospital. In addition, organization of medical training is increasingly being influenced by economic considerations as well as a high level of medical specialization. We asked young respiratory physicians how they assessed their current situation with respect to quality of medical training and organization of their work environment. METHODS From September to November 2019, we performed an online survey adressing young respiratory physicians in Germany. Participants were recruited via three emails (baseline and reminders after 2 and 6 weeks) sent by the German Respiratory Society (DGP) and the German Union of Pulmonologists (BdP). The questionnaire consisted of a maximum of 62 questions. Apart from own questions that had been aligned with other questionnaires from similar surveys in other medical specialties, we also assessed the effort-reward ratio (ER ratio) based on the short version of the effort-reward imbalance questionnaire (16 questions). RESULTS We recuited n = 224 participants (33.8 ± 4.5 years, 5.4 ± 2.9 years of medical training, 54.4 % female , 86.8 % with German nationality). A little under half of the interviewees (n = 103, 46 %) reported to be very or generally satisfied with their working conditions, while n = 60 (27 %) were unsure. The main reasons for not being satisfied were long working hours and high work-load, as well as a lack of streamlining the work environment in the hospital to the specific needs of doctors. Despite the fact that many participants were satisfied, a large majority (n = 166, 88.2 %) depicted an unfavorable effort-reward ratio imbalance (adjusted mean 1.89 ± 2.18). CONCLUSION Compared to many other European countries and internationally, the German healthcare system offers high-quality patient care and a well-equipped work environment. Increasing demands in the health care sector, however, are leading to a gratification crisis that not only harms the health and work performance of doctors but is also leading to reduced attractiveness of the job that might possibly lead to the search for new fields of activity or migration. Respiratory medicine is a discipline of growing interest and motivating young doctors to secure the promotion of this discipline is increasingly important. Factors harming the growth of this discipline should be immediately addressed. The results of this survey might help leaders in the field to restructure the work environment and medical education according to the actual needs.
Collapse
Affiliation(s)
- T Bahmer
- Universitätsklinikum Schleswig-Holstein, Campus Kiel, Medizinische Klinik I, Abteilung für Pneumologie, Kiel.,Airway Research Center North (ARCN), Deutsches Zentrum für Lungenforschung (DZL)
| | - J Wälscher
- Universitätsmedizin Essen, Ruhrlandklinik, Klinik für Pneumologie, Zentrum für interstitielle und seltene Erkrankungen, Essen
| | - C Fisser
- Universitätsklinikum Regensburg, Klinik und Poliklinik für Innere Medizin II, Regensburg
| | - E E Groth
- Airway Research Center North (ARCN), Deutsches Zentrum für Lungenforschung (DZL).,LungenClinic Grosshansdorf, Pneumologie, Großhansdorf
| | - T Schreiber
- Krankenhaus Bethanien gGMBH, Klinik für Pneumologie und Allergologie, Solingen
| | - M Koch
- Universitätsklinikum Regensburg, Klinik und Poliklinik für Innere Medizin II, Regensburg
| | - M Raspe
- Charité - Universitätsmedizin Berlin, Mitglied der Freien Universität Berlin, Humboldt-Universität zu Berlin und des Berlin Institute of Health, Medizinische Klinik m. S. Infektiologie und Pneumologie, Berlin
| |
Collapse
|
9
|
Möller F, Distler V, Walbaum T, Haarlammert N, Nold J, Schreiber T, Unger S, Reichel V, Kobelke J, Bierlich J, Schwuchow A, Eschrich T, Leich M, Wondraczek K, Tünnermann A. Influence of pedestal diameter on mode instabilities in Yb/Ce/Al-doped fibers. Opt Express 2020; 28:33456-33474. [PMID: 33115008 DOI: 10.1364/oe.403460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 10/12/2020] [Indexed: 06/11/2023]
Abstract
In this paper we present numerical and experimental results revealing that the mode instability threshold of highly Yb-doped, Ce/Al co-doped pedestal fibers is affected by the size of the index-increased pedestal structure surrounding the core. An alternative preparation technology for the realization of large mode area fibers with very large Al-doped silica pedestals is introduced. Three different pedestal fiber design iterations characterized by low photodarkening were manufactured and tested in counter-pumped amplifier setups. Up to 1.9 kW continuous-wave output power of near-diffraction-limited beam quality (M2 = 1.26) was achieved with an 18/200/420 µm fiber of very low NA = 0.042, limited only by the occurrence of mode instabilities.
Collapse
|
10
|
Dunker F, Trutzenberg A, Rothenpieler JS, Kuhn S, Pröls R, Schreiber T, Tissier A, Kemen A, Kemen E, Hückelhoven R, Weiberg A. Oomycete small RNAs bind to the plant RNA-induced silencing complex for virulence. eLife 2020; 9:56096. [PMID: 32441255 PMCID: PMC7297541 DOI: 10.7554/elife.56096] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 05/21/2020] [Indexed: 12/21/2022] Open
Abstract
The exchange of small RNAs (sRNAs) between hosts and pathogens can lead to gene silencing in the recipient organism, a mechanism termed cross-kingdom RNAi (ck-RNAi). While fungal sRNAs promoting virulence are established, the significance of ck-RNAi in distinct plant pathogens is not clear. Here, we describe that sRNAs of the pathogen Hyaloperonospora arabidopsidis, which represents the kingdom of oomycetes and is phylogenetically distant from fungi, employ the host plant’s Argonaute (AGO)/RNA-induced silencing complex for virulence. To demonstrate H. arabidopsidis sRNA (HpasRNA) functionality in ck-RNAi, we designed a novel CRISPR endoribonuclease Csy4/GUS reporter that enabled in situ visualization of HpasRNA-induced target suppression in Arabidopsis. The significant role of HpasRNAs together with AtAGO1 in virulence was revealed in plant atago1 mutants and by transgenic Arabidopsis expressing a short-tandem-target-mimic to block HpasRNAs, that both exhibited enhanced resistance. HpasRNA-targeted plant genes contributed to host immunity, as Arabidopsis gene knockout mutants displayed quantitatively enhanced susceptibility.
Collapse
Affiliation(s)
- Florian Dunker
- Faculty of Biology, Genetics, Biocenter Martinsried, LMU Munich, Martinsried, Germany
| | - Adriana Trutzenberg
- Faculty of Biology, Genetics, Biocenter Martinsried, LMU Munich, Martinsried, Germany
| | - Jan S Rothenpieler
- Faculty of Biology, Genetics, Biocenter Martinsried, LMU Munich, Martinsried, Germany
| | - Sarah Kuhn
- Faculty of Biology, Genetics, Biocenter Martinsried, LMU Munich, Martinsried, Germany
| | - Reinhard Pröls
- Phytopathology, School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany
| | - Tom Schreiber
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, Halle, Germany
| | - Alain Tissier
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, Halle, Germany
| | - Ariane Kemen
- Center for Plant Molecular Biology, Interfaculty Institute of Microbiology and Infection Medicine Tübingen, University of Tübingen, Tübingen, Germany
| | - Eric Kemen
- Center for Plant Molecular Biology, Interfaculty Institute of Microbiology and Infection Medicine Tübingen, University of Tübingen, Tübingen, Germany
| | - Ralph Hückelhoven
- Phytopathology, School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany
| | - Arne Weiberg
- Faculty of Biology, Genetics, Biocenter Martinsried, LMU Munich, Martinsried, Germany
| |
Collapse
|
11
|
Schubert R, Dobritzsch S, Gruber C, Hause G, Athmer B, Schreiber T, Marillonnet S, Okabe Y, Ezura H, Acosta IF, Tarkowska D, Hause B. Tomato MYB21 Acts in Ovules to Mediate Jasmonate-Regulated Fertility. Plant Cell 2019; 31:1043-1062. [PMID: 30894458 PMCID: PMC6533027 DOI: 10.1105/tpc.18.00978] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 02/19/2019] [Accepted: 03/19/2019] [Indexed: 05/05/2023]
Abstract
The function of the plant hormone jasmonic acid (JA) in the development of tomato (Solanum lycopersicum) flowers was analyzed with a mutant defective in JA perception (jasmonate-insensitive1-1, jai1-1). In contrast with Arabidopsis (Arabidopsis thaliana) JA-insensitive plants, which are male sterile, the tomato jai1-1 mutant is female sterile, with major defects in female development. To identify putative JA-dependent regulatory components, we performed transcriptomics on ovules from flowers at three developmental stages from wild type and jai1-1 mutants. One of the strongly downregulated genes in jai1-1 encodes the MYB transcription factor SlMYB21. Its Arabidopsis ortholog plays a crucial role in JA-regulated stamen development. SlMYB21 was shown here to exhibit transcription factor activity in yeast, to interact with SlJAZ9 in yeast and in planta, and to complement Arabidopsis myb21-5 To analyze SlMYB21 function, we generated clustered regularly interspaced short palindromic repeats(CRISPR)/CRISPR associated protein 9 (Cas9) mutants and identified a mutant by Targeting Induced Local Lesions in Genomes (TILLING). These mutants showed female sterility, corroborating a function of MYB21 in tomato ovule development. Transcriptomics analysis of wild type, jai1-1, and myb21-2 carpels revealed processes that might be controlled by SlMYB21. The data suggest positive regulation of JA biosynthesis by SlMYB21, but negative regulation of auxin and gibberellins. The results demonstrate that SlMYB21 mediates at least partially the action of JA and might control the flower-to-fruit transition.
.
Collapse
Affiliation(s)
- Ramona Schubert
- Department of Cell and Metabolic Biology, Institute of Plant Biochemistry, 06120 Halle, Germany
| | - Susanne Dobritzsch
- Department of Cell and Metabolic Biology, Institute of Plant Biochemistry, 06120 Halle, Germany
| | - Cornelia Gruber
- Department of Cell and Metabolic Biology, Institute of Plant Biochemistry, 06120 Halle, Germany
| | - Gerd Hause
- Martin Luther University Halle Wittenberg, Biocenter, Electron Microscopy, 06120 Halle, Germany
| | - Benedikt Athmer
- Department of Cell and Metabolic Biology, Institute of Plant Biochemistry, 06120 Halle, Germany
| | - Tom Schreiber
- Department of Cell and Metabolic Biology, Institute of Plant Biochemistry, 06120 Halle, Germany
| | - Sylvestre Marillonnet
- Department of Cell and Metabolic Biology, Institute of Plant Biochemistry, 06120 Halle, Germany
| | - Yoshihiro Okabe
- Tsukuba Plant Innovation Research Center, University of Tsukuba, Tsukuba, Japan
| | - Hiroshi Ezura
- Tsukuba Plant Innovation Research Center, University of Tsukuba, Tsukuba, Japan
| | - Ivan F Acosta
- Max Planck Institute for Plant Breeding Research, 50829 Köln, Germany
| | - Danuse Tarkowska
- Laboratory of Growth Regulators, Palacky University and Institute of Experimental Botany, Czech Academy of Sciences, v.v.i., CZ-78371, Olomouc, Czech Republic
| | - Bettina Hause
- Department of Cell and Metabolic Biology, Institute of Plant Biochemistry, 06120 Halle, Germany
| |
Collapse
|
12
|
Schreiber T, Prange A, Hoppe T, Tissier A. Split-TALE: A TALE-Based Two-Component System for Synthetic Biology Applications in Planta. Plant Physiol 2019; 179:1001-1012. [PMID: 30643014 PMCID: PMC6393785 DOI: 10.1104/pp.18.01218] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Accepted: 01/02/2019] [Indexed: 05/20/2023]
Abstract
Transcription activator-like effectors (TALEs) are bacterial Type-III effector proteins from phytopathogenic Xanthomonas species that act as transcription factors in plants. The modular DNA-binding domain of TALEs can be reprogrammed to target nearly any DNA sequence. Here, we designed and optimized a two-component AND-gate system for synthetic circuits in plants based on TALEs. In this system, named split-TALE (sTALE), the TALE DNA binding domain and the transcription activation domain are separated and each fused to protein interacting domains. Physical interaction of interacting domains leads to TALE-reconstitution and can be monitored by reporter gene induction. This setup was used for optimization of the sTALE scaffolds, which result in an AND-gate system with an improved signal-to-noise ratio. We also provide a toolkit of ready-to-use vectors and single modules compatible with Golden Gate cloning and MoClo syntax. In addition to its implementation in synthetic regulatory circuits, the sTALE system allows the analysis of protein-protein interactions in planta.
Collapse
Affiliation(s)
- Tom Schreiber
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany
| | - Anja Prange
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany
| | - Tina Hoppe
- Department of Genetics, Institute for Biology, Martin-Luther University Halle-Wittenberg, 06120 Halle (Saale), Germany
| | - Alain Tissier
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany
| |
Collapse
|
13
|
Schreiber T, Kuhn S, Feldkamp G, Schwuchow A, Schuster K, Hein S, Eberhardt R, Tünnermann A. Micro-fluorescence lifetime and spectral imaging of ytterbium doped laser materials. Opt Express 2018; 26:32417-32432. [PMID: 30645409 DOI: 10.1364/oe.26.032417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 10/22/2018] [Indexed: 06/09/2023]
Abstract
We present the application of a confocal fluorescence microscope to the analysis of Yb-doped solid-state laser materials, with examples of Yb-doped crystals, photonic crystal fibers and fiber preforms made with different manufacturing processes. Beside the fluorescence lifetime image itself, a microscopic spectral fluorescence emission analysis is presented and spatially resolved emission cross sections are obtained. Doping concentration and its distributions and other laser optical parameters are measured, which help to analyze manufacturing steps. Further properties like photodarkening and saturation are addressed.
Collapse
|
14
|
Kaki A, Alraies MC, Blank N, Hasan R, Hton W, Grines C, Mohamad T, Elder M, Schreiber T. P3589Outcome of women compared with men in patients undergoing complex percutaneous coronary intervention with hemodynamic support. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p3589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- A Kaki
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - M C Alraies
- Cleveland Clinic, Department of Cardiovascular Medicine, Cleveland, United States of America
| | - N Blank
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - R Hasan
- University of Michigan Health System, Ann Arbor, United States of America
| | - W Hton
- Lenox Hill Heart and Vascular Institute, New York, United States of America
| | - C Grines
- The Zena and Michael A. Wiener Cardiovascular Institute, New York, United States of America
| | - T Mohamad
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - M Elder
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - T Schreiber
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| |
Collapse
|
15
|
Kaki A, Alraies MC, Blank N, Grines CL, Hasan R, Jani A, Shemesh A, Pahuja M, Kajy M, Laktineh A, Gade CG, Mohamad T, Elder M, Schreiber T. P5518Axillary artery as alternative access for mechanical circulatory support devices in patients with prohibitive peripheral arterial disease. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p5518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- A Kaki
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - M C Alraies
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - N Blank
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - C L Grines
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - R Hasan
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - A Jani
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - A Shemesh
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - M Pahuja
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - M Kajy
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - A Laktineh
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - C G Gade
- New York University School of Medicine, New York, United States of America
| | - T Mohamad
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - M Elder
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| | - T Schreiber
- Wayne State University, Detroit Medical Center - Interventional Cardiology, Detroit, United States of America
| |
Collapse
|
16
|
Klenke A, Müller M, Stark H, Stutzki F, Hupel C, Schreiber T, Tünnermann A, Limpert J. Coherently combined 16-channel multicore fiber laser system. Opt Lett 2018; 43:1519-1522. [PMID: 29601019 DOI: 10.1364/ol.43.001519] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 03/03/2018] [Indexed: 06/08/2023]
Abstract
We present a coherently combined laser amplifier with 16 channels from a multicore fiber in a proof-of-principle demonstration. Filled-aperture beam splitting and combination, together with temporal phasing, is realized in a compact and low-component-count setup. Combined average power of up to 70 W with 40 ps pulses is achieved with combination efficiencies around 80%.
Collapse
|
17
|
Beier F, Hupel C, Kuhn S, Hein S, Nold J, Proske F, Sattler B, Liem A, Jauregui C, Limpert J, Haarlammert N, Schreiber T, Eberhardt R, Tünnermann A. Single mode 4.3 kW output power from a diode-pumped Yb-doped fiber amplifier. Opt Express 2017; 25:14892-14899. [PMID: 28789071 DOI: 10.1364/oe.25.014892] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 05/22/2017] [Indexed: 06/07/2023]
Abstract
We investigate the average power scaling of two diode-pumped Yb-doped fiber amplifiers emitting a diffraction-limited beam. The first fiber under investigation with a core diameter of 30 µm was able to amplify a 10 W narrow linewidth seed laser up to 2.8 kW average output power before the onset of transverse mode instabilities (TMI). A further power scaling was achieved using a second fiber with a smaller core size (23µm), which allowed for a narrow linewidth output power of 3.5 kW limited by stimulated Brillouin scattering (SBS). We mitigated SBS using a spectral broadening mechanism, which allowed us to further increase the output power to 4.3 kW only limited by the available pump power. Up to this power level, a high slope efficiency of 90% with diffraction-limited beam quality and without any sign of TMI or stimulated Raman scattering for a spectral dynamic range of higher than -80 dB was obtained.
Collapse
|
18
|
Schreiber T, Attanasio P, Pieske B, Blaschke F, Boldt LH, Haverkamp W, Huemer M. P1544The effect of an ultra-low framerate and antiscatter grid-less radiation protocol for device implantation. Europace 2017. [DOI: 10.1093/ehjci/eux158.170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
19
|
Attanasio P, Schreiber T, Pieske B, Blaschke F, Boldt LH, Haverkamp W, Huemer M. P311Pushing the limits: establishing an ultra-low framerate and antiscatter grid-less radiation protocol for left atrial ablations. Europace 2017. [DOI: 10.1093/ehjci/eux141.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
20
|
Bock V, Plötner M, De Vries O, Nold J, Haarlammert N, Schreiber T, Eberhardt R, Tünnermann A. Modal content measurements (S 2) of negative curvature hollow-core photonic crystal fibers. Opt Express 2017; 25:3006-3012. [PMID: 28241518 DOI: 10.1364/oe.25.003006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present modal content measurements (S2) of two different negative curvature hollow-core photonic crystal fibers: a kagome fiber and an ice cream cone fiber. Their sensitivity towards mode matching, bending and polarization is analyzed. For the kagome fiber, a higher order mode suppression of 17dB under optimal conditions was achieved, and for the ice cream cone fiber there was a suppression of up to 42dB. Polarization turned out to be a critical parameter for good higher order mode suppression in both fibers.
Collapse
|
21
|
Abstract
The discovery of proteins with programmable DNA-binding specificities triggered a whole array of applications in synthetic biology, including genome editing, regulation of transcription, and epigenetic modifications. Among those, transcription activator-like effectors (TALEs) due to their natural function as transcription regulators, are especially well-suited for the development of orthogonal systems for the control of gene expression. We describe here the construction and testing of libraries of synthetic TALE-activated promoters which are under the control of a single TALE with a given DNA-binding specificity. These libraries consist of a fixed DNA-binding element for the TALE, a TATA box, and variable sequences of 19 bases upstream and 43 bases downstream of the DNA-binding element. These libraries were cloned using a Golden Gate cloning strategy making them usable as standard parts in a modular cloning system. The broad range of promoter activities detected and the versatility of these promoter libraries make them valuable tools for applications in the fine-tuning of expression in metabolic engineering projects or in the design and implementation of regulatory circuits.
Collapse
Affiliation(s)
- T Schreiber
- Leibniz Institute of Plant Biochemistry, Halle (Saale), Germany
| | - A Tissier
- Leibniz Institute of Plant Biochemistry, Halle (Saale), Germany.
| |
Collapse
|
22
|
Beier F, Hupel C, Nold J, Kuhn S, Hein S, Ihring J, Sattler B, Haarlammert N, Schreiber T, Eberhardt R, Tünnermann A. Narrow linewidth, single mode 3 kW average power from a directly diode pumped ytterbium-doped low NA fiber amplifier. Opt Express 2016; 24:6011-6020. [PMID: 27136795 DOI: 10.1364/oe.24.006011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report on a newly designed and fabricated ytterbium-doped large mode area fiber with an extremely low NA (~0.04) and related systematic investigations on fiber parameters that crucially influence the mode instability threshold. The fiber is used to demonstrate a narrow linewidth, continuous wave, single mode fiber laser amplifier emitting a maximum output power of 3 kW at a wavelength of 1070 nm without reaching the mode-instability threshold. A high slope efficiency of 90 %, excellent beam quality, high temporal stability, and an ASE suppression of 70 dB could be reached with a signal linewidth of only 170 pm.
Collapse
|
23
|
Schreiber T, Sorgatz A, List F, Blüher D, Thieme S, Wilmanns M, Bonas U. Refined requirements for protein regions important for activity of the TALE AvrBs3. PLoS One 2015; 10:e0120214. [PMID: 25781334 PMCID: PMC4363659 DOI: 10.1371/journal.pone.0120214] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 01/20/2015] [Indexed: 11/25/2022] Open
Abstract
AvrBs3, the archetype of the family of transcription activator-like (TAL) effectors from phytopathogenic Xanthomonas bacteria, is translocated by the type III secretion system into the plant cell. AvrBs3 localizes to the plant cell nucleus and activates the transcription of target genes. Crucial for this is the central AvrBs3 region of 17.5 34-amino acid repeats that functions as a DNA-binding domain mediating recognition in a “one-repeat-to-one base pair” manner. Although AvrBs3 forms homodimers in the plant cell cytosol prior to nuclear import, it binds DNA as a monomer. Here, we show that complex formation of AvrBs3 proteins negatively affects their DNA-binding affinity in vitro. The conserved cysteine residues at position 30 of each repeat facilitate AvrBs3 complexes via disulfide bonds in vitro but are also required for the gene-inducing activity of the AvrBs3 monomer, i.e., activation of plant gene promoters. Our data suggest that the latter is due to a contribution to protein plasticity and that cysteine substitutions to alanine or serine result in a different DNA-binding mode. In addition, our studies revealed that extended parts of both the N-terminal and C-terminal regions of AvrBs3 contribute to DNA binding and, hence, gene-inducing activity in planta.
Collapse
Affiliation(s)
- Tom Schreiber
- Institute for Biology, Department of Genetics, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Anika Sorgatz
- Institute for Biology, Department of Genetics, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Felix List
- Institute for Biology, Department of Genetics, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
- European Molecular Biology Laboratory, Hamburg Unit, Notkestraße 85, Hamburg, Germany
| | - Doreen Blüher
- Institute for Biology, Department of Genetics, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Sabine Thieme
- Institute for Biology, Department of Genetics, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Matthias Wilmanns
- European Molecular Biology Laboratory, Hamburg Unit, Notkestraße 85, Hamburg, Germany
| | - Ulla Bonas
- Institute for Biology, Department of Genetics, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
- * E-mail:
| |
Collapse
|
24
|
Eichelsbacher P, Raič M, Schreiber T. Moderate deviations for stabilizing functionals in geometric probability. Ann Inst H Poincaré Probab Statist 2015. [DOI: 10.1214/13-aihp576] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
25
|
Beier F, Otto HJ, Jauregui C, de Vries O, Schreiber T, Limpert J, Eberhardt R, Tünnermann A. 1009 nm continuous-wave ytterbium-doped fiber amplifier emitting 146 W. Opt Lett 2014; 39:3725-3727. [PMID: 24978721 DOI: 10.1364/ol.39.003725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this Letter, we demonstrate a single-mode continuous-wave fiber laser amplifier emitting 146 W of average output power at a wavelength of 1009 nm. The wavelength and bandwidth of the seed oscillator are defined by a pair of fiber Bragg gratings. The seed is amplified in a two-stage ytterbium-doped rod-type amplifier to 146 W with a high slope efficiency of 64%, showing excellent beam quality and stability throughout the experiment. The ASE suppression is as high as 63 dB.
Collapse
|
26
|
Garcia-Soto A, Lucci J, Podack E, Schreiber T, Schroeder E. Cancer-testis antigen expression is shared between epithelial ovarian cancer tumors. Gynecol Oncol 2014. [DOI: 10.1016/j.ygyno.2014.03.253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
27
|
Abstract
AvrBs3, the founding member of the Xanthomonas transcription-activator-like effectors (TALEs), is translocated into the plant cell where it localizes to the nucleus and acts as transcription factor. The DNA-binding domain of AvrBs3 consists of 17.5 nearly-identical 34 amino acid-repeats. Each repeat specifies binding to one base in the target DNA via amino acid residues 12 and 13 termed repeat variable diresidue (RVD). Natural target sequences of TALEs are generally preceded by a thymine (T0), which is coordinated by a tryptophan residue (W232) in a degenerated repeat upstream of the canonical repeats. To investigate the necessity of T0 and the conserved tryptophan for AvrBs3-mediated gene activation we tested TALE mutant derivatives on target sequences preceded by all possible four bases. In addition, we performed domain swaps with TalC from a rice pathogenic Xanthomonas because TalC lacks the tryptophan residue, and the TalC target sequence is preceded by cytosine. We show that T0 works best and that T0 specificity depends on the repeat number and overall RVD-composition. T0 and W232 appear to be particularly important if the RVD of the first repeat is HD ('rep1 effect'). Our findings provide novel insights into the mechanism of T0 recognition by TALE proteins and are important for TALE-based biotechnological applications.
Collapse
Affiliation(s)
- Tom Schreiber
- Department of Genetics, Martin Luther University, Weinbergweg 10, 06120 Halle (Saale), Germany
| | - Ulla Bonas
- Department of Genetics, Martin Luther University, Weinbergweg 10, 06120 Halle (Saale), Germany
| |
Collapse
|
28
|
Schwarzkopf K, Reichel J, Preußler N, Graf N, Madsen H, Schreiber T, Gugel M, Hüter L. Atemwegsmanagement bei Schnittverletzungen am Hals mit Eröffnung der oberen Luftwege. Notf Rett Med 2014. [DOI: 10.1007/s10049-014-1856-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
29
|
Boehme S, Hirte K, Fabian S, Hupel C, Schreiber T, Eberhardt R, Tünnermann A. CO2-laser-based coating process for high power fiber application. ACTA ACUST UNITED AC 2014. [DOI: 10.1117/12.2036357] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
|
30
|
Schreiber T, Yukich JE. Limit theorems for geometric functionals of Gibbs point processes. Ann Inst H Poincaré Probab Statist 2013. [DOI: 10.1214/12-aihp500] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
31
|
de Lange O, Schreiber T, Schandry N, Radeck J, Braun KH, Koszinowski J, Heuer H, Strauß A, Lahaye T. Breaking the DNA-binding code of Ralstonia solanacearum TAL effectors provides new possibilities to generate plant resistance genes against bacterial wilt disease. New Phytol 2013; 199:773-86. [PMID: 23692030 DOI: 10.1111/nph.12324] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Accepted: 04/03/2013] [Indexed: 05/22/2023]
Abstract
Ralstonia solanacearum is a devastating bacterial phytopathogen with a broad host range. Ralstonia solanacearum injected effector proteins (Rips) are key to the successful invasion of host plants. We have characterized Brg11(hrpB-regulated 11), the first identified member of a class of Rips with high sequence similarity to the transcription activator-like (TAL) effectors of Xanthomonas spp., collectively termed RipTALs. Fluorescence microscopy of in planta expressed RipTALs showed nuclear localization. Domain swaps between Brg11 and Xanthomonas TAL effector (TALE) AvrBs3 (avirulence protein triggering Bs3 resistance) showed the functional interchangeability of DNA-binding and transcriptional activation domains. PCR was used to determine the sequence of brg11 homologs from strains infecting phylogenetically diverse host plants. Brg11 localizes to the nucleus and activates promoters containing a matching effector-binding element (EBE). Brg11 and homologs preferentially activate promoters containing EBEs with a 5' terminal guanine, contrasting with the TALE preference for a 5' thymine. Brg11 and other RipTALs probably promote disease through the transcriptional activation of host genes. Brg11 and the majority of homologs identified in this study were shown to activate similar or identical target sequences, in contrast to TALEs, which generally show highly diverse target preferences. This information provides new options for the engineering of plants resistant to R. solanacearum.
Collapse
Affiliation(s)
- Orlando de Lange
- Genetics, Department of Biology I, Ludwig-Maximilians-University Munich, Martinsried, Germany
| | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Abstract
We report on the generation of high-energy pulses in an all normal dispersion photonic-crystal fiber laser. Two mode-locking techniques with and without passive spectral filtering are studied both numerically and experimentally to address a roadmap for energy scaling. It is found that high-contrast passive modulation is a very promising mode-locking technique for energy scaling in dissipative-soliton laser. Moreover, this technique does not need any additional spectral filtering than the limited gain bandwidth to stabilize high-energy ultrashort pulses. The presented laser generates 110 nJ chirped pulses at 57 MHz repetition rate for an average power of 6.2 W. The output pulses could be dechirped close to the transform-limited duration of 100 fs.
Collapse
Affiliation(s)
- C Lecaplain
- UMR 6614 CORIA, Université de Rouen, Saint Etienne du Rouvray, France.
| | | | | | | |
Collapse
|
33
|
Schmidt O, Rekas M, Wirth C, Rothhardt J, Rhein S, Kliner A, Strecker M, Schreiber T, Limpert J, Eberhardt R, Tünnermann A. High power narrow-band fiber-based ASE source. Opt Express 2011; 19:4421-4427. [PMID: 21369273 DOI: 10.1364/oe.19.004421] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
In this paper we describe a high power narrow-band amplified spontaneous emission (ASE) light source at 1030 nm center wavelength generated in an Yb-doped fiber-based experimental setup. By cutting a small region out of a broadband ASE spectrum using two fiber Bragg gratings a strongly constrained bandwidth of 12±2 pm (3.5±0.6 GHz) is formed. A two-stage high power fiber amplifier system is used to boost the output power up to 697 W with a measured beam quality of M2≤1.34. In an additional experiment we demonstrate a stimulated Brillouin scattering (SBS) suppression of at least 17 dB (theoretically predicted ~20 dB), which is only limited by the dynamic range of the measurement and not by the onset of SBS when using the described light source. The presented narrow-band ASE source could be of great interest for brightness scaling applications by beam combination, where SBS is known as a limiting factor.
Collapse
Affiliation(s)
- O Schmidt
- Fraunhofer Institute for Applied Optics and Precision Engineering, Jena, Germany.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Fritsche E, Gassmann K, Rockel T, Schreiber T, Schuwald J, Krutmann J. Human neurospheres as three-dimensional cellular systems for developmental neurotoxicity testing. Toxicol Lett 2010. [DOI: 10.1016/j.toxlet.2010.03.107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
35
|
Heitmann L, Schreiber T, Thye T, Mckenzie ANJ, Brombacher F, Horstmann RD, Meyer CG, Ehlers S, Hoelscher C. The influence of interleukin-13/interleukin-4 receptor-alpha signaling in the pathology of tuberculosis. Pneumologie 2010. [DOI: 10.1055/s-0029-1247917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
36
|
Schmidt O, Wirth C, Nodop D, Limpert J, Schreiber T, Peschel T, Eberhardt R, Tünnermann A. Spectral beam combination of fiber amplified ns-pulses by means of interference filters. Opt Express 2009; 17:22974-22982. [PMID: 20052223 DOI: 10.1364/oe.17.022974] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In this paper we introduce a simple scheme to spectrally combine four single beams using three low-cost dielectric interference filters as combining elements. 25 ns pulses from four independent and actively Q-switched fiber seed-sources are amplified in a single stage fiber-amplifier. Temporally and spatially combined 208 W of average power and 6.3 mJ of pulse energy are obtained at two different repetition frequencies. A detailed analysis of beam quality as well as the thermal behavior of the combining elements is carried out and reveals mutual dependency.
Collapse
Affiliation(s)
- O Schmidt
- Friedrich-Schiller University, Institute of Applied Physics, Albert-Einstein-Str. 15, 07745 Jena, Germany.
| | | | | | | | | | | | | | | |
Collapse
|
37
|
Schmidt O, Wirth C, Tsybin I, Schreiber T, Eberhardt R, Limpert J, Tünnermann A. Average power of 1.1 kW from spectrally combined, fiber-amplified, nanosecond-pulsed sources. Opt Lett 2009; 34:1567-1569. [PMID: 19448823 DOI: 10.1364/ol.34.001567] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report on spectral combination of four high repetition rate 5 ns pulsed Yb-doped fiber amplifiers at 1 microm wavelength. The output beam is spatially and temporally superposed by use of an all-reflective diffraction grating. 1.1 kW average power and 220 microJ pulse energy were extracted with a combining efficiency of 99%.
Collapse
Affiliation(s)
- O Schmidt
- Friedrich Schiller University Jena, Institute of Applied Physics, Albert-Einstein-Strasse 15,D-07745 Jena, Germany.
| | | | | | | | | | | | | |
Collapse
|
38
|
Wirth C, Schmidt O, Tsybin I, Schreiber T, Peschel T, Brückner F, Clausnitzer T, Limpert J, Eberhardt R, Tünnermann A, Gowin M, ten Have E, Ludewigt K, Jung M. 2 kW incoherent beam combining of four narrow-linewidth photonic crystal fiber amplifiers. Opt Express 2009; 17:1178-1183. [PMID: 19188944 DOI: 10.1364/oe.17.001178] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report on beam combining of four narrow-linewidth fiber amplifier chains, running at different wavelengths and each delivering 500 W optical output power. The main amplifier stage consists of a large mode area photonic crystal fiber. The four output beams of the amplifier chains are spectrally (incoherent) combined using a polarization-independent dielectric reflective diffraction grating to form an output beam of 2 kW continuous-wave optical power with good beam quality (M(2)x = 2.0, M(2)y = 1.8).
Collapse
Affiliation(s)
- C Wirth
- Friedrich-Schiller University, Institute of Applied Physics, Jena, Germany.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Baryshnikov Y, Eichelsbacher P, Schreiber T, Yukich JE. Moderate deviations for some point measures in geometric probability. Ann Inst H Poincaré Probab Statist 2008. [DOI: 10.1214/07-aihp137] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
40
|
Hölscher C, Hölscher A, Schreiber T, Rückerl D, Adams P, Woodland D, McKenzie A, Brombacher F, Iwakura Y, Ehlers S, Lange C. The tuberculin skin test in mice mainly depends on interferon-gamma-producing CD4+ T- lymphocytes. Pneumologie 2008. [DOI: 10.1055/s-2008-1074418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
41
|
|
42
|
Hüter L, Schwarzkopf K, Preussler NP, Gaser E, Bauer R, Schubert H, Schreiber T. Effects of Arginine Vasopressin on Oxygenation and Haemodynamics during One-Lung Ventilation in an Animal Model. Anaesth Intensive Care 2008; 36:162-6. [DOI: 10.1177/0310057x0803600204] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In a case of arterial hypotension during one-lung ventilation, haemodynamic support may be required to maintain adequate mean arterial pressure. Arginine vasopressin, a potent systemic vasoconstrictor with limited effects on the pulmonary artery pressure, has not been studied in this setting. Twelve female pigs were anaesthetised and ventilated and arterial, central venous and pulmonary artery catheters were inserted. A left-sided double lumen tube was placed via tracheostomy and one-lung ventilation was initiated. The animals were in the left lateral position, with the left lung ventilated and right lung collapsed. Respiratory and haemodynamic values were recorded before and during a continuous infusion of arginine vasopressin sufficient to double the mean arterial pressure. The arginine vasopressin caused a decrease in cardiac output (3.8±1.1 vs. 2.7±0.7 l/min, P <0.001) and mixed-venous oxygen tension (39.1±5.8 vs. 34.4±5 mmHg, P=0.003). Pulmonary artery pressure was unchanged (24±2 vs. 24±3 mmHg, P=0.682). There was no effect of the arginine vasopressin on arterial oxygen tension (226±106 vs. 231±118 mmHg, P=0.745). However, there was a significant decrease in shunt fraction (28.3±6.2 vs. 24.3±7.8%, P=0.043) and a significant proportional increase in perfusion of the ventilated lung (78.8±9.5 vs. 85.5±7.9%, P=0.036). In our animal model of one-lung ventilation, doubling mean arterial pressure by infusion of arginine vasopressin significantly affected global haemodynamics, but had no influence on systemic arterial oxygen tension.
Collapse
Affiliation(s)
- L. Hüter
- Department of Anaesthesiology and Intensive Care Medicine, Center for Molecular Biomedicine and Institute for Experimental Animals, University of Jena, Jena, Germany
- Department of Anesthesiology and Intensive Care Medicine
| | - K. Schwarzkopf
- Department of Anaesthesiology and Intensive Care Medicine, Center for Molecular Biomedicine and Institute for Experimental Animals, University of Jena, Jena, Germany
- Department of Anaesthesiology and Intensive Care Medicine
| | - N. P. Preussler
- Department of Anaesthesiology and Intensive Care Medicine, Center for Molecular Biomedicine and Institute for Experimental Animals, University of Jena, Jena, Germany
- Department of Anaesthesiology and Intensive Care Medicine
| | - E. Gaser
- Department of Anaesthesiology and Intensive Care Medicine, Center for Molecular Biomedicine and Institute for Experimental Animals, University of Jena, Jena, Germany
- Department of Anaesthesiology and Intensive Care Medicine
| | - R. Bauer
- Department of Anaesthesiology and Intensive Care Medicine, Center for Molecular Biomedicine and Institute for Experimental Animals, University of Jena, Jena, Germany
- Department of Anaesthesiology and Intensive Care Medicine
| | - H. Schubert
- Department of Anaesthesiology and Intensive Care Medicine, Center for Molecular Biomedicine and Institute for Experimental Animals, University of Jena, Jena, Germany
- Center for Molecular Biomedicine
| | - T. Schreiber
- Department of Anaesthesiology and Intensive Care Medicine, Center for Molecular Biomedicine and Institute for Experimental Animals, University of Jena, Jena, Germany
- Department of Anaesthesiology and Intensive Care Medicine
| |
Collapse
|
43
|
Ortaç B, Lecaplain C, Hideur A, Schreiber T, Limpert J, Tünnermann A. Passively mode-locked single-polarization microstructure fiber laser. Opt Express 2008; 16:2122-2128. [PMID: 18542292 DOI: 10.1364/oe.16.002122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The generation of high-power and stable ultra-short pulses from a passively mode-locked purely normal dispersion fiber laser is reported using the unique combination of a photonic crystal fiber featuring single-polarization, single-mode, and low nonlinearity with a high modulation depth semiconductor saturable absorber mirror. The environmentally-stable, self-starting fiber laser generates 1.6 W of average power at a repetition rate of 63 MHz, corresponding to a pulse energy of 25 nJ. The emitted pulses are positively chirped with a pulse duration of 3.7 ps. They are compressible down to a near transform-limited duration of 750 fs. Numerical simulations are in good agreement with the experimental results.
Collapse
Affiliation(s)
- B Ortaç
- Institute of Applied Physics, Friedrich Schiller University Jena, Albert-Einstein-Strasse 15, D-07745 Jena, Germany.
| | | | | | | | | | | |
Collapse
|
44
|
Westhoff J, Kröner C, Meller R, Schreiber T, Zech S, Hubrich V, Krettek C. Eingeklemmte Fahrzeuginsassen in der Luftrettung. Unfallchirurg 2008; 111:155-61. [DOI: 10.1007/s00113-007-1380-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
45
|
Schreiber T, Yukich JE. Variance asymptotics and central limit theorems for generalized growth processes with applications to convex hulls and maximal points. ANN PROBAB 2008. [DOI: 10.1214/009117907000000259] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
46
|
Ortaς B, Plötner M, Schreiber T, Limpert J, Tünnermann A. Experimental and numerical study of pulse dynamics in positive net-cavity dispersion modelocked Yb-doped fiber lasers. Opt Express 2007; 15:15595-15602. [PMID: 19550847 DOI: 10.1364/oe.15.015595] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We report on environmentally stable mode-locked Yb-doped all-fiber lasers operating in the wave-breaking-free and stretched-pulse regime. The compact linear cavity is constructed with saturable absorber mirror directly glued to the fibers end-facet as nonlinear mode-locking mechanism and chirped fiber Bragg grating for dispersion management, thus, without any free-space optics. In the wave-breaking-free regime the laser generates positively-chirped pulses with a pulse duration of 15.4 ps. These pulses are compressed to 218 fs in a hollow-core photonic bandgap fiber spliced to the output port. Adaptation of dispersion management has led to operation in the stretched-pulse regime, where a parabolic spectral profile is obtained as well. In this regime pulses are compressible to 213 fs. Numerical simulations are presented which confirm the wave-breaking-free and stretched-pulse evolution inside the fiber laser cavity. Both regimes are compared in terms of pulse quality.
Collapse
|
47
|
Ortaç B, Schmidt O, Schreiber T, Limpert J, Tünnermann A, Hideur A. High-energy femtosecond Yb-doped dispersion compensation free fiber laser. Opt Express 2007; 15:10725-10732. [PMID: 19547427 DOI: 10.1364/oe.15.010725] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We report on a mode-locked high energy fiber laser operating in the dispersion compensation free regime. The sigma cavity is constructed with a saturable absorber mirror and short-length large-mode-area photonic crystal fiber. The laser generates positively-chirped pulses with an energy of 265 nJ at a repetition rate of 10.18 MHz in a stable and self-starting operation. The pulses are compressible down to 400 fs leading to a peak power of 500 kW. Numerical simulations accurately reflect the experimental results and reveal the mechanisms for self consistent intracavity pulse evolution. With this performance mode-locked fiber lasers can compete with state-of-the-art bulk femtosecond oscillators for the first time and pulse energy scaling beyond the muJ-level appears to be feasible.
Collapse
|
48
|
Abstract
INTRODUCTION Prehospital transtracheal ventilation via a needle cricothyroidotomy may be lifesaving in cannot-intubate-cannot-ventilate situations. A self-made device consisting of a three-way stopcock placed between a transtracheal airway catheter and an oxygen supply was constructed and the effectiveness of the device was compared with a hand-triggered emergency jet generator in animal experiments. MATERIALS AND METHODS An emergency transtracheal airway catheter was inserted into the trachea of 10 anesthetized pigs (18-35 kgbw) and a situation of partial expiratory airway obstruction was established. All pigs were ventilated in a randomized order via the transtracheal airway catheter with the hand-triggered emergency jet injector and the self-made device for 15 min each. RESULTS With both devices satisfactory oxygenation and ventilation was achieved in all animals. CONCLUSIONS The efficacy of the self-made device during the experiment was comparable with the efficacy of the hand-triggered emergency jet injector.
Collapse
Affiliation(s)
- K Schwarzkopf
- Klinik für Anästhesiologie und Intensivtherapie, Friedrich-Schiller-Universität, Erlanger Allee 101, 07745 Jena.
| | | | | | | | | |
Collapse
|
49
|
Schmidt O, Rothhardt J, Röser F, Linke S, Schreiber T, Rademaker K, Limpert J, Ermeneux S, Yvernault P, Salin F, Tünnermann A. Millijoule pulse energy Q-switched short-length fiber laser. Opt Lett 2007; 32:1551-3. [PMID: 17546185 DOI: 10.1364/ol.32.001551] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
We report on a Q-switched short-length fiber laser producing 100 W of average output power at 100 kHz repetition rate and pulse durations as short as 17 ns. Up to 2 mJ of energy and sub-10-ns pulse duration are extracted at lower repetition rates. This performance is obtained by employing a rod-type ytterbium-doped photonic crystal fiber with a 70 microm core as gain medium, allowing for very short pulse durations, high energy storage, and emission of a single-transverse-mode beam.
Collapse
Affiliation(s)
- O Schmidt
- Friedrich Schiller University Jena, Institute of Applied Physics, Albert-Einstein-Strasse 15, Jena, Germany.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Aguergaray C, Andersen TV, Schimpf DN, Schmidt O, Rothhardt J, Schreiber T, Limpert J, Cormier E, Tünnermann A. Parametric amplification and compression to ultrashort pulse duration of resonant linear waves. Opt Express 2007; 15:5699-5710. [PMID: 19532828 DOI: 10.1364/oe.15.005699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report on an optical parametric amplification system which is pumped and seeded by fiber generated laser radiation. Due to its low broadening threshold, high spatial beam quality and high stability, the fiber based broad bandwidth signal generation is a promising alternative to white light generation in bulky glass or sapphire plates. We demonstrate a novel and successful signal engineering implemented in a setup for parametric amplification and subsequent recompression of resonant linear waves resulting from soliton fission in a highly nonlinear photonic crystal fiber. The applied pump source is a high repetition rate ytterbium-doped fiber chirped pulse amplification system. The presented approach results in the generation of ~50 fs pulses at MHz repetition rate. The potential of generating even shorter pulse duration and higher pulse energies will be discussed.
Collapse
|