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  • 1
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    Localization-delocalization transition of electrons at the percolation threshold of semiconductor GaAs_{1−x}N_{x} alloys: The appearance of a mobility edge (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-07-10
    Description: Author(s): K. Alberi, B. Fluegel, D. A. Beaton, A. J. Ptak, and A. Mascarenhas Electrons in semiconductor alloys have generally been described in terms of Bloch states that evolve from constructive interference of electron waves scattering from perfectly periodic potentials, despite the loss of structural periodicity that occurs on alloying. Using the semiconductor alloy GaAs 1... [Phys. Rev. B 86, 041201] Published Mon Jul 09, 2012
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Effect of Bi alloying on the hole transport in the dilute bismide alloy GaAs_{1-x} Bi_{x} (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-02-17
    Description: Author(s): R. N. Kini, A. J. Ptak, B. Fluegel, R. France, R. C. Reedy, and A. Mascarenhas We studied the effect of Bi incorporation on the hole mobility in the dilute bismide alloy GaAs_{1-x} Bi_{x} using electrical transport (Hall) and photoluminescence (PL) techniques. Our measurements show that the hole mobility decreases with increasing Bi concentration. Analysis of the temperature-d... [Phys. Rev. B 83, 075307] Published Wed Feb 16, 2011
    Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Resonant state due to Bi in the dilute bismide alloy GaAs1−xBix (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-10-17
    Description: Author(s): R. S. Joshya, A. J. Ptak, R. France, A. Mascarenhas, and R. N. Kini It has been theoretically predicted that isolated Bi forms a resonant state in the valence band of the dilute bismide alloy, GaAs1−xBix. We present ultrafast pump-probe reflectivity measurements of this interesting alloy system, which provide experimental evidence for the resonant state. The reflect... [Phys. Rev. B 90, 165203] Published Thu Oct 16, 2014
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    The genomic landscapes of human breast and colorectal cancers (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-10-13
    Description: Human cancer is caused by the accumulation of mutations in oncogenes and tumor suppressor genes. To catalog the genetic changes that occur during tumorigenesis, we isolated DNA from 11 breast and 11 colorectal tumors and determined the sequences of the genes in the Reference Sequence database in these samples. Based on analysis of exons representing 20,857 transcripts from 18,191 genes, we conclude that the genomic landscapes of breast and colorectal cancers are composed of a handful of commonly mutated gene "mountains" and a much larger number of gene "hills" that are mutated at low frequency. We describe statistical and bioinformatic tools that may help identify mutations with a role in tumorigenesis. These results have implications for understanding the nature and heterogeneity of human cancers and for using personal genomics for tumor diagnosis and therapy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wood, Laura D -- Parsons, D Williams -- Jones, Sian -- Lin, Jimmy -- Sjoblom, Tobias -- Leary, Rebecca J -- Shen, Dong -- Boca, Simina M -- Barber, Thomas -- Ptak, Janine -- Silliman, Natalie -- Szabo, Steve -- Dezso, Zoltan -- Ustyanksky, Vadim -- Nikolskaya, Tatiana -- Nikolsky, Yuri -- Karchin, Rachel -- Wilson, Paul A -- Kaminker, Joshua S -- Zhang, Zemin -- Croshaw, Randal -- Willis, Joseph -- Dawson, Dawn -- Shipitsin, Michail -- Willson, James K V -- Sukumar, Saraswati -- Polyak, Kornelia -- Park, Ben Ho -- Pethiyagoda, Charit L -- Pant, P V Krishna -- Ballinger, Dennis G -- Sparks, Andrew B -- Hartigan, James -- Smith, Douglas R -- Suh, Erick -- Papadopoulos, Nickolas -- Buckhaults, Phillip -- Markowitz, Sanford D -- Parmigiani, Giovanni -- Kinzler, Kenneth W -- Velculescu, Victor E -- Vogelstein, Bert -- CA 43460/CA/NCI NIH HHS/ -- CA 57345/CA/NCI NIH HHS/ -- CA109274/CA/NCI NIH HHS/ -- CA112828/CA/NCI NIH HHS/ -- CA121113/CA/NCI NIH HHS/ -- CA62924/CA/NCI NIH HHS/ -- GM070219/GM/NIGMS NIH HHS/ -- GM07309/GM/NIGMS NIH HHS/ -- P30-CA43703/CA/NCI NIH HHS/ -- RR017698/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2007 Nov 16;318(5853):1108-13. Epub 2007 Oct 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ludwig Center for Cancer Genetics and Therapeutics and Howard Hughes Medical Institute at Johns Hopkins Kimmel Cancer Center, Baltimore, MD 21231, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17932254" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Breast Neoplasms/*genetics/metabolism ; Cell Line ; Chromosome Mapping ; Colorectal Neoplasms/*genetics/metabolism ; Computational Biology ; DNA, Neoplasm ; Databases, Genetic ; Genes, Neoplasm ; Genome, Human ; Humans ; Metabolic Networks and Pathways/genetics ; Mice ; Mutation ; Neoplasm Proteins/genetics/metabolism ; Sequence Analysis, DNA
    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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    Mutational analysis of the tyrosine phosphatome in colorectal cancers (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-05-25
    Description: Tyrosine phosphorylation, regulated by protein tyrosine phosphatases (PTPs) and kinases (PTKs), is important in signaling pathways underlying tumorigenesis. A mutational analysis of the tyrosine phosphatase gene superfamily in human cancers identified 83 somatic mutations in six PTPs (PTPRF, PTPRG, PTPRT, PTPN3, PTPN13, PTPN14), affecting 26% of colorectal cancers and a smaller fraction of lung, breast, and gastric cancers. Fifteen mutations were nonsense, frameshift, or splice-site alterations predicted to result in truncated proteins lacking phosphatase activity. Five missense mutations in the most commonly altered PTP (PTPRT) were biochemically examined and found to reduce phosphatase activity. Expression of wild-type but not a mutant PTPRT in human cancer cells inhibited cell growth. These observations suggest that the mutated tyrosine phosphatases are tumor suppressor genes, regulating cellular pathways that may be amenable to therapeutic intervention.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Zhenghe -- Shen, Dong -- Parsons, D Williams -- Bardelli, Alberto -- Sager, Jason -- Szabo, Steve -- Ptak, Janine -- Silliman, Natalie -- Peters, Brock A -- van der Heijden, Michiel S -- Parmigiani, Giovanni -- Yan, Hai -- Wang, Tian-Li -- Riggins, Greg -- Powell, Steven M -- Willson, James K V -- Markowitz, Sanford -- Kinzler, Kenneth W -- Vogelstein, Bert -- Velculescu, Victor E -- CA 43460/CA/NCI NIH HHS/ -- CA 57345/CA/NCI NIH HHS/ -- CA 62924/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2004 May 21;304(5674):1164-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Sidney Kimmel Comprehensive Cancer Center, Howard Hughes Medical Institute, Johns Hopkins University Medical Institutions, Baltimore, MD 21231, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15155950" target="_blank"〉PubMed〈/a〉
    Keywords: Catalytic Domain ; Cell Division ; Codon, Nonsense ; Colorectal Neoplasms/*enzymology/*genetics ; Computational Biology ; *DNA Mutational Analysis ; Exons ; Frameshift Mutation ; Genes, Tumor Suppressor ; Humans ; Kinetics ; Markov Chains ; *Mutation ; Mutation, Missense ; Nerve Tissue Proteins/chemistry/genetics/metabolism ; Phosphorylation ; Protein Tyrosine Phosphatase, Non-Receptor Type 13 ; Protein Tyrosine Phosphatase, Non-Receptor Type 3 ; Protein Tyrosine Phosphatases/chemistry/*genetics/metabolism ; Receptor-Like Protein Tyrosine Phosphatases, Class 5 ; Signal Transduction ; Transfection ; Tyrosine/*metabolism
    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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  • 6
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    Mutational analysis of the tyrosine kinome in colorectal cancers (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-05-10
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bardelli, Alberto -- Parsons, D Williams -- Silliman, Natalie -- Ptak, Janine -- Szabo, Steve -- Saha, Saurabh -- Markowitz, Sanford -- Willson, James K V -- Parmigiani, Giovanni -- Kinzler, Kenneth W -- Vogelstein, Bert -- Velculescu, Victor E -- CA43460/CA/NCI NIH HHS/ -- CA57345/CA/NCI NIH HHS/ -- CA62924/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2003 May 9;300(5621):949.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Howard Hughes Medical Institute and The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD 21231, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12738854" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Colorectal Neoplasms/*enzymology/*genetics ; Computational Biology ; *DNA Mutational Analysis ; Exons ; Fusion Proteins, gag-onc/genetics ; Guanylate Cyclase/genetics ; Humans ; Molecular Sequence Data ; Mutation ; Polymerase Chain Reaction ; Protein Structure, Tertiary ; Protein-Tyrosine Kinases/chemistry/*genetics/metabolism ; Receptor, EphA3/genetics ; Receptor, trkB/genetics ; Receptor, trkC/genetics ; Sequence Analysis, DNA ; Vascular Endothelial Growth Factor Receptor-2/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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  • 7
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    High frequency of mutations of the PIK3CA gene in human cancers (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-03-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Samuels, Yardena -- Wang, Zhenghe -- Bardelli, Alberto -- Silliman, Natalie -- Ptak, Janine -- Szabo, Steve -- Yan, Hai -- Gazdar, Adi -- Powell, Steven M -- Riggins, Gregory J -- Willson, James K V -- Markowitz, Sanford -- Kinzler, Kenneth W -- Vogelstein, Bert -- Velculescu, Victor E -- CA 43460/CA/NCI NIH HHS/ -- CA 57345/CA/NCI NIH HHS/ -- CA 62924/CA/NCI NIH HHS/ -- CA 67900/CA/NCI NIH HHS/ -- CA 88128/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2004 Apr 23;304(5670):554. Epub 2004 Mar 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Sidney Kimmel Comprehensive Cancer Center, Howard Hughes Medical Institute, The Johns Hopkins University Medical Institutions, Baltimore, MD 21231, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15016963" target="_blank"〉PubMed〈/a〉
    Keywords: Breast Neoplasms/genetics ; Catalytic Domain ; Colorectal Neoplasms/genetics ; Glioblastoma/genetics ; Humans ; Lung Neoplasms/genetics ; *Mutation ; Neoplasms/*genetics ; Phosphatidylinositol 3-Kinases/*genetics/metabolism ; Sequence Analysis, DNA ; Stomach Neoplasms/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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    The consensus coding sequences of human breast and colorectal cancers (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-09-09
    Description: The elucidation of the human genome sequence has made it possible to identify genetic alterations in cancers in unprecedented detail. To begin a systematic analysis of such alterations, we determined the sequence of well-annotated human protein-coding genes in two common tumor types. Analysis of 13,023 genes in 11 breast and 11 colorectal cancers revealed that individual tumors accumulate an average of approximately 90 mutant genes but that only a subset of these contribute to the neoplastic process. Using stringent criteria to delineate this subset, we identified 189 genes (average of 11 per tumor) that were mutated at significant frequency. The vast majority of these genes were not known to be genetically altered in tumors and are predicted to affect a wide range of cellular functions, including transcription, adhesion, and invasion. These data define the genetic landscape of two human cancer types, provide new targets for diagnostic and therapeutic intervention, and open fertile avenues for basic research in tumor biology.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sjoblom, Tobias -- Jones, Sian -- Wood, Laura D -- Parsons, D Williams -- Lin, Jimmy -- Barber, Thomas D -- Mandelker, Diana -- Leary, Rebecca J -- Ptak, Janine -- Silliman, Natalie -- Szabo, Steve -- Buckhaults, Phillip -- Farrell, Christopher -- Meeh, Paul -- Markowitz, Sanford D -- Willis, Joseph -- Dawson, Dawn -- Willson, James K V -- Gazdar, Adi F -- Hartigan, James -- Wu, Leo -- Liu, Changsheng -- Parmigiani, Giovanni -- Park, Ben Ho -- Bachman, Kurtis E -- Papadopoulos, Nickolas -- Vogelstein, Bert -- Kinzler, Kenneth W -- Velculescu, Victor E -- CA 121113/CA/NCI NIH HHS/ -- CA 43460/CA/NCI NIH HHS/ -- CA 57345/CA/NCI NIH HHS/ -- CA 62924/CA/NCI NIH HHS/ -- CA109274/CA/NCI NIH HHS/ -- GM 07309/GM/NIGMS NIH HHS/ -- HHSN261200433002C/PHS HHS/ -- P30-CA43703/CA/NCI NIH HHS/ -- RR 017698/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2006 Oct 13;314(5797):268-74. Epub 2006 Sep 7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ludwig Center and Howard Hughes Medical Institute, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD 21231, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16959974" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Substitution ; Breast Neoplasms/*genetics ; Cell Line, Tumor ; Colorectal Neoplasms/*genetics ; Computational Biology ; *Consensus Sequence ; Databases, Nucleic Acid ; Female ; *Genes, Neoplasm ; Genome, Human ; Humans ; Male ; *Mutation ; Polymerase Chain Reaction ; Sequence Analysis, DNA
    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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    Evolution of superclusters and delocalized states in GaAs_{1−x}N_{x} (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-11-22
    Description: Author(s): B. Fluegel, K. Alberi, D. A. Beaton, S. A. Crooker, A. J. Ptak, and A. Mascarenhas The evolution of individual nitrogen cluster bound states into an extended state infinite supercluster in dilute GaAs 1− x N x was probed through temperature and intensity-dependent, time-resolved and magnetophotoluminescence (PL) measurements. Samples with compositions less than 0.23% N exhibit PL beha... [Phys. Rev. B 86, 205203] Published Wed Nov 21, 2012
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
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    Magnetic-Field-Induced Delocalized to Localized Transformation in GaAs:N (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-04-13
    Description: Author(s): K. Alberi, S. A. Crooker, B. Fluegel, D. A. Beaton, A. J. Ptak, and A. Mascarenhas The use of a high magnetic field (57 T) to study the formation and evolution of nitrogen (N) cluster and supercluster states in GaAs:N is demonstrated. A magnetic field is used to lift the conduction band edge and expose resonant N cluster states so that they can be directly experimentally investiga... [Phys. Rev. Lett. 110, 156405] Published Fri Apr 12, 2013
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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