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  • 1
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    Self versus non-self discrimination during CRISPR RNA-directed immunity (2010)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2010-01-15
    Description: All immune systems must distinguish self from non-self to repel invaders without inducing autoimmunity. Clustered, regularly interspaced, short palindromic repeat (CRISPR) loci protect bacteria and archaea from invasion by phage and plasmid DNA through a genetic interference pathway. CRISPR loci are present in approximately 40% and approximately 90% of sequenced bacterial and archaeal genomes, respectively, and evolve rapidly, acquiring new spacer sequences to adapt to highly dynamic viral populations. Immunity requires a sequence match between the invasive DNA and the spacers that lie between CRISPR repeats. Each cluster is genetically linked to a subset of the cas (CRISPR-associated) genes that collectively encode 〉40 families of proteins involved in adaptation and interference. CRISPR loci encode small CRISPR RNAs (crRNAs) that contain a full spacer flanked by partial repeat sequences. CrRNA spacers are thought to identify targets by direct Watson-Crick pairing with invasive 'protospacer' DNA, but how they avoid targeting the spacer DNA within the encoding CRISPR locus itself is unknown. Here we have defined the mechanism of CRISPR self/non-self discrimination. In Staphylococcus epidermidis, target/crRNA mismatches at specific positions outside of the spacer sequence license foreign DNA for interference, whereas extended pairing between crRNA and CRISPR DNA repeats prevents autoimmunity. Hence, this CRISPR system uses the base-pairing potential of crRNAs not only to specify a target, but also to spare the bacterial chromosome from interference. Differential complementarity outside of the spacer sequence is a built-in feature of all CRISPR systems, indicating that this mechanism is a broadly applicable solution to the self/non-self dilemma that confronts all immune pathways.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2813891/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2813891/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marraffini, Luciano A -- Sontheimer, Erik J -- R03 AI079722/AI/NIAID NIH HHS/ -- R03 AI079722-01A1/AI/NIAID NIH HHS/ -- England -- Nature. 2010 Jan 28;463(7280):568-71. doi: 10.1038/nature08703. Epub 2010 Jan 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, 2205 Tech Drive, Evanston, Illinois 60208, USA. marraffini@northwestern.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20072129" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Proteins/genetics ; Base Pairing/genetics ; Base Sequence ; Conserved Sequence ; DNA, Intergenic/genetics ; Molecular Sequence Data ; Mutation/genetics ; RNA, Bacterial/*genetics/metabolism ; Repetitive Sequences, Nucleic Acid/*genetics/*immunology ; Staphylococcus epidermidis/*genetics/*immunology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 2
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    Microbiology: slicer for DNA (2010)
    Nature Publishing Group (NPG)
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    Publication Date: 2010-11-05
    Description: 〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3045673/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3045673/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sontheimer, Erik J -- Marraffini, Luciano A -- R01 GM093769/GM/NIGMS NIH HHS/ -- R01 GM093769-01/GM/NIGMS NIH HHS/ -- England -- Nature. 2010 Nov 4;468(7320):45-6. doi: 10.1038/468045a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21048757" target="_blank"〉PubMed〈/a〉
    Keywords: Bacteriophages/*genetics/metabolism ; DNA, Intergenic/genetics/metabolism ; DNA, Viral/genetics/*metabolism ; Genetic Loci/*genetics/*immunology ; Interspersed Repetitive Sequences/*genetics ; Plasmids/genetics/*metabolism ; RNA Interference ; RNA, Bacterial/*genetics/immunology ; Streptococcus thermophilus/genetics/*immunology/*virology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 3
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    CRISPR-Cas immunity in prokaryotes (2015)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2015-10-04
    Description: Prokaryotic organisms are threatened by a large array of viruses and have developed numerous defence strategies. Among these, only clustered, regularly interspaced short palindromic repeat (CRISPR)-Cas systems provide adaptive immunity against foreign elements. Upon viral injection, a small sequence of the viral genome, known as a spacer, is integrated into the CRISPR locus to immunize the host cell. Spacers are transcribed into small RNA guides that direct the cleavage of the viral DNA by Cas nucleases. Immunization through spacer acquisition enables a unique form of evolution whereby a population not only rapidly acquires resistance to its predators but also passes this resistance mechanism vertically to its progeny.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marraffini, Luciano A -- 1DP2AI104556-01/AI/NIAID NIH HHS/ -- England -- Nature. 2015 Oct 1;526(7571):55-61. doi: 10.1038/nature15386.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Bacteriology, The Rockefeller University, 1230 York Avenue, New York, New York 10065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26432244" target="_blank"〉PubMed〈/a〉
    Keywords: CRISPR-Associated Proteins/metabolism ; CRISPR-Cas Systems/genetics/*immunology ; Escherichia coli/genetics/immunology/metabolism/virology ; Prokaryotic Cells/*immunology/virology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 4
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    CRISPR interference limits horizontal gene transfer in staphylococci by targeting DNA (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-12-20
    Description: Horizontal gene transfer (HGT) in bacteria and archaea occurs through phage transduction, transformation, or conjugation, and the latter is particularly important for the spread of antibiotic resistance. Clustered, regularly interspaced, short palindromic repeat (CRISPR) loci confer sequence-directed immunity against phages. A clinical isolate of Staphylococcus epidermidis harbors a CRISPR spacer that matches the nickase gene present in nearly all staphylococcal conjugative plasmids. Here we show that CRISPR interference prevents conjugation and plasmid transformation in S. epidermidis. Insertion of a self-splicing intron into nickase blocks interference despite the reconstitution of the target sequence in the spliced mRNA, which indicates that the interference machinery targets DNA directly. We conclude that CRISPR loci counteract multiple routes of HGT and can limit the spread of antibiotic resistance in pathogenic bacteria.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2695655/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2695655/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marraffini, Luciano A -- Sontheimer, Erik J -- GM072830/GM/NIGMS NIH HHS/ -- R01 GM072830/GM/NIGMS NIH HHS/ -- R01 GM072830-04/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2008 Dec 19;322(5909):1843-5. doi: 10.1126/science.1165771.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, 2205 Tech Drive, Evanston, IL 60208, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19095942" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; *Conjugation, Genetic ; DNA, Bacterial/*genetics/metabolism ; Deoxyribonuclease I/genetics/metabolism ; *Gene Silencing ; *Gene Transfer, Horizontal ; Plasmids/genetics ; RNA Splicing ; RNA, Bacterial/*genetics/metabolism ; Repetitive Sequences, Nucleic Acid/*genetics ; Staphylococcus Phages/genetics ; Staphylococcus aureus/genetics ; Staphylococcus epidermidis/*genetics ; *Transformation, Bacterial
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Conditional tolerance of temperate phages via transcription-dependent CRISPR-Cas targeting (2014)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2014-09-02
    Description: A fundamental feature of immune systems is the ability to distinguish pathogenic from self and commensal elements, and to attack the former but tolerate the latter. Prokaryotic CRISPR-Cas immune systems defend against phage infection by using Cas nucleases and small RNA guides that specify one or more target sites for cleavage of the viral genome. Temperate phages include viruses that can integrate into the bacterial chromosome, and they can carry genes that provide a fitness advantage to the lysogenic host. However, CRISPR-Cas targeting that relies strictly on DNA sequence recognition provides indiscriminate immunity both to lytic and lysogenic infection by temperate phages-compromising the genetic stability of these potentially beneficial elements altogether. Here we show that the Staphylococcus epidermidis CRISPR-Cas system can prevent lytic infection but tolerate lysogenization by temperate phages. Conditional tolerance is achieved through transcription-dependent DNA targeting, and ensures that targeting is resumed upon induction of the prophage lytic cycle. Our results provide evidence for the functional divergence of CRISPR-Cas systems and highlight the importance of targeting mechanism diversity. In addition, they extend the concept of 'tolerance to non-self' to the prokaryotic branch of adaptive immunity.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4214910/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4214910/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Goldberg, Gregory W -- Jiang, Wenyan -- Bikard, David -- Marraffini, Luciano A -- 1DP2AI104556-01/AI/NIAID NIH HHS/ -- DP2 AI104556/AI/NIAID NIH HHS/ -- T32 AI070084/AI/NIAID NIH HHS/ -- England -- Nature. 2014 Oct 30;514(7524):633-7. doi: 10.1038/nature13637. Epub 2014 Aug 31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Bacteriology, The Rockefeller University, New York, New York 10065, USA. ; 1] Laboratory of Bacteriology, The Rockefeller University, New York, New York 10065, USA [2] Synthetic Biology Group, Institut Pasteur, 28 Rue du Dr. Roux, 75015 Paris, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25174707" target="_blank"〉PubMed〈/a〉
    Keywords: Bacteriophages/*genetics/immunology/pathogenicity/*physiology ; Base Sequence ; CRISPR-Associated Proteins/immunology/metabolism ; CRISPR-Cas Systems/*genetics/immunology/*physiology ; Clustered Regularly Interspaced Short Palindromic Repeats/genetics/immunology ; DNA, Viral/genetics/immunology/metabolism ; Immune Tolerance ; Lysogeny/genetics/immunology ; Molecular Sequence Data ; Proviruses/genetics/immunology/pathogenicity/physiology ; Staphylococcus epidermidis/*genetics/immunology/*virology ; *Transcription, Genetic
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 6
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    Cas9 specifies functional viral targets during CRISPR-Cas adaptation (2015)
    Nature Publishing Group (NPG)
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    Publication Date: 2015-02-25
    Description: Clustered regularly interspaced short palindromic repeat (CRISPR) loci and their associated (Cas) proteins provide adaptive immunity against viral infection in prokaryotes. Upon infection, short phage sequences known as spacers integrate between CRISPR repeats and are transcribed into small RNA molecules that guide the Cas9 nuclease to the viral targets (protospacers). Streptococcus pyogenes Cas9 cleavage of the viral genome requires the presence of a 5'-NGG-3' protospacer adjacent motif (PAM) sequence immediately downstream of the viral target. It is not known whether and how viral sequences flanked by the correct PAM are chosen as new spacers. Here we show that Cas9 selects functional spacers by recognizing their PAM during spacer acquisition. The replacement of cas9 with alleles that lack the PAM recognition motif or recognize an NGGNG PAM eliminated or changed PAM specificity during spacer acquisition, respectively. Cas9 associates with other proteins of the acquisition machinery (Cas1, Cas2 and Csn2), presumably to provide PAM-specificity to this process. These results establish a new function for Cas9 in the genesis of prokaryotic immunological memory.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4385744/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4385744/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Heler, Robert -- Samai, Poulami -- Modell, Joshua W -- Weiner, Catherine -- Goldberg, Gregory W -- Bikard, David -- Marraffini, Luciano A -- 1DP2AI104556-01/AI/NIAID NIH HHS/ -- DP2 AI104556/AI/NIAID NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2015 Mar 12;519(7542):199-202. doi: 10.1038/nature14245. Epub 2015 Feb 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Bacteriology, The Rockefeller University, 1230 York Avenue, New York, New York 10065, USA. ; 1] Laboratory of Bacteriology, The Rockefeller University, 1230 York Avenue, New York, New York 10065, USA [2] Synthetic Biology Group, Institut Pasteur, 28 Rue du Dr. Roux, 75015 Paris, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25707807" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; CRISPR-Associated Proteins/*metabolism ; *CRISPR-Cas Systems/immunology ; Clustered Regularly Interspaced Short Palindromic Repeats/*genetics/immunology ; DNA, Viral/*genetics/immunology/metabolism ; Molecular Sequence Data ; Nucleotide Motifs ; Protein Binding ; Protein Structure, Tertiary ; Staphylococcus aureus ; Streptococcus pyogenes/*enzymology/*genetics/immunology/virology ; Substrate Specificity
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
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    Multiplex genome engineering using CRISPR/Cas systems (2013)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2013-01-05
    Description: Functional elucidation of causal genetic variants and elements requires precise genome editing technologies. The type II prokaryotic CRISPR (clustered regularly interspaced short palindromic repeats)/Cas adaptive immune system has been shown to facilitate RNA-guided site-specific DNA cleavage. We engineered two different type II CRISPR/Cas systems and demonstrate that Cas9 nucleases can be directed by short RNAs to induce precise cleavage at endogenous genomic loci in human and mouse cells. Cas9 can also be converted into a nicking enzyme to facilitate homology-directed repair with minimal mutagenic activity. Lastly, multiple guide sequences can be encoded into a single CRISPR array to enable simultaneous editing of several sites within the mammalian genome, demonstrating easy programmability and wide applicability of the RNA-guided nuclease technology.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3795411/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3795411/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cong, Le -- Ran, F Ann -- Cox, David -- Lin, Shuailiang -- Barretto, Robert -- Habib, Naomi -- Hsu, Patrick D -- Wu, Xuebing -- Jiang, Wenyan -- Marraffini, Luciano A -- Zhang, Feng -- DP1 MH100706/MH/NIMH NIH HHS/ -- DP1MH100706/DP/NCCDPHP CDC HHS/ -- DP2 AI104556/AI/NIAID NIH HHS/ -- DP2AI104556/AI/NIAID NIH HHS/ -- R01 NS073124/NS/NINDS NIH HHS/ -- R01-CA133404/CA/NCI NIH HHS/ -- R01-GM34277/GM/NIGMS NIH HHS/ -- T32 GM007753/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2013 Feb 15;339(6121):819-23. doi: 10.1126/science.1231143. Epub 2013 Jan 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Broad Institute of MIT and Harvard, 7 Cambridge Center, Cambridge, MA 02142, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23287718" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Caspase 9/*chemistry/genetics ; DNA/chemistry/genetics ; *DNA Cleavage ; Genetic Engineering/*methods ; Genetic Loci ; Genome/*genetics ; Humans ; Inverted Repeat Sequences/*genetics ; Mice ; Microarray Analysis/*methods ; Molecular Sequence Data ; Mutagenesis ; RNA/chemistry/genetics ; Recombinational DNA Repair ; Streptococcus pyogenes/enzymology/genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    RNA. CRISPR goes retro (2016)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2016-02-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sontheimer, Erik J -- Marraffini, Luciano A -- New York, N.Y. -- Science. 2016 Feb 26;351(6276):920-1. doi: 10.1126/science.aaf2851.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉RNA Therapeutics Institute, Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA 01605, USA. erik.sontheimer@umassmed.edu marraffini@rockefeller.edu. ; Laboratory of Bacteriology, The Rockefeller University, New York, NY 10065, USA. erik.sontheimer@umassmed.edu marraffini@rockefeller.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26917756" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Amide bonds assemble pili on the surface of bacilli (2008)
    National Academy of Sciences
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    Publication Date: 2008-07-11
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
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    Mature clustered, regularly interspaced, short palindromic repeats RNA (crRNA) length is measured by a ruler mechanism anchored at the precursor processing site (2011)
    National Academy of Sciences
    Details
    Publication Date: 2011-12-12
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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