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  • 1
    Publication Date: 1992-08-21
    Description: Cells with distinct developmental histories can respond differentially to identical signals, suggesting that signals are interpreted in a fashion that reflects a cell's identity. How this might occur is suggested by the observation that proteins of the homeodomain family, including a newly identified human protein, enhance the DNA-binding activity of serum response factor, a protein required for the induction of genes by growth and differentiation factors. Interaction with proteins of the serum response factor family may allow homeodomain proteins to specify the transcriptional response to inductive signals. Moreover, because the ability to enhance the binding of serum response factor to DNA residues within the homeodomain but is independent of homeodomain DNA-binding activity, this additional activity of the homeodomain may account for some of specificity of action of homeodomain proteins in development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grueneberg, D A -- Natesan, S -- Alexandre, C -- Gilman, M Z -- CA08968/CA/NCI NIH HHS/ -- CA45642/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1992 Aug 21;257(5073):1089-95.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cold Spring Harbor Laboratory, NY 11724.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1509260" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Binding Sites ; DNA/genetics/*metabolism ; DNA-Binding Proteins/chemistry/genetics/*metabolism/*pharmacology ; Drosophila/genetics ; *Drosophila Proteins ; Fungal Proteins/chemistry/pharmacology ; *Homeodomain Proteins ; Humans ; Minichromosome Maintenance 1 Protein ; Molecular Sequence Data ; Nuclear Proteins/*metabolism ; Saccharomyces cerevisiae/genetics ; Serum Response Factor ; Transcription Factors/chemistry/*metabolism/pharmacology ; Transfection
    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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  • 2
    Publication Date: 2010-04-27
    Description: Induced pluripotent stem cells (iPSCs) have been generated by enforced expression of defined sets of transcription factors in somatic cells. It remains controversial whether iPSCs are molecularly and functionally equivalent to blastocyst-derived embryonic stem (ES) cells. By comparing genetically identical mouse ES cells and iPSCs, we show here that their overall messenger RNA and microRNA expression patterns are indistinguishable with the exception of a few transcripts encoded within the imprinted Dlk1-Dio3 gene cluster on chromosome 12qF1, which were aberrantly silenced in most of the iPSC clones. Consistent with a developmental role of the Dlk1-Dio3 gene cluster, these iPSC clones contributed poorly to chimaeras and failed to support the development of entirely iPSC-derived animals ('all-iPSC mice'). In contrast, iPSC clones with normal expression of the Dlk1-Dio3 cluster contributed to high-grade chimaeras and generated viable all-iPSC mice. Notably, treatment of an iPSC clone that had silenced Dlk1-Dio3 with a histone deacetylase inhibitor reactivated the locus and rescued its ability to support full-term development of all-iPSC mice. Thus, the expression state of a single imprinted gene cluster seems to distinguish most murine iPSCs from ES cells and allows for the prospective identification of iPSC clones that have the full development potential of ES cells.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3987905/" 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/PMC3987905/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stadtfeld, Matthias -- Apostolou, Effie -- Akutsu, Hidenori -- Fukuda, Atsushi -- Follett, Patricia -- Natesan, Sridaran -- Kono, Tomohiro -- Shioda, Toshi -- Hochedlinger, Konrad -- DP2 OD003266/OD/NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2010 May 13;465(7295):175-81. doi: 10.1038/nature09017. Epub 2010 Apr 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute at Massachusetts General Hospital, Center for Regenerative Medicine; Harvard Stem Cell Institute, 185 Cambridge Street, Boston, Massachusetts 02114, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20418860" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Chromosomes, Mammalian/*genetics ; Embryonic Stem Cells/metabolism ; Epigenesis, Genetic/genetics ; Female ; Fibroblasts ; *Gene Expression Profiling ; *Gene Silencing ; Genomic Imprinting/*genetics ; Intercellular Signaling Peptides and Proteins/genetics ; Mice ; MicroRNAs/genetics/metabolism ; Multigene Family/genetics ; Nuclear Proteins/genetics ; Pluripotent Stem Cells/cytology/*metabolism ; Proteins/genetics ; RNA, Long Noncoding ; RNA, Messenger/genetics/metabolism ; Transcription, Genetic/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillan Magazines Ltd.
    Nature 390 (1997), S. 349-350 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The introduction of a potent transcriptional activator into eukaryotic cells can paradoxically suppress the transcription of a co-introduced target gene. This so-called ‘squelching’ is thought to result from titration of one or more general transcription factors (GTFs), indicating ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 48 (1992), S. 729-731 
    ISSN: 1420-9071
    Keywords: Urea cycle ; leech ; botryoidal tissue ; hirudineans ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Ornithine carbamoyltransferase (OCT) and arginase, but not arginine synthetase (AS), were detected in the body wall and gut tissues of the leech. The activities of these enzymes were not altered by starvation. The high activity of arginase in body wall is probably due to the association of the latter with botryoidal tissue. Hirudineans, which evolved from oligochaete ancestors, appear to have lost the citrulline-arginine segment of the urea cycle due to their ammonotelic mode of nitrogen excretion.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 83 (1985), S. 191-198 
    ISSN: 1573-5036
    Keywords: Conventional soil tests ; EUF-Ca ; EUF-K ; EUF-Mg ; EUF-Mn ; EUF-N ; EUF-P ; Tea productivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The relationship between EUF extractable nutrients and conventional soil test extractable nutrients in the acid soils of Southern India on one hand and that between EUF values and tea productivity on the other are described. Close correlation exists between EUF-NO3−N at 20°C and CuSO4−Ag2SO4-extractable NO3−N (r=0.98***), EUF-Norg and Morgan's reagent extractable NH4−N (r=0.97***), total EUF-N and CuSO4−Ag2SO4-extractable NO3−N plus Morgan's reagent NH4−N (r=0.96***), EUF-P at 20°C and modified Bray II-P (r=0.93***) and EUF-P at 20°C plus that at 80°C and modified Bray II-P (r=0.91***). The EUF-K at 20°C shows close correlation with NH4OAc−K (r=0.80***), Ag-thiourea-K (r=0.86***) and Morgan's reagent-K (r=0.84***) whereas the EUF-K at 80°C shows close correlation with the difference in K contents of NH4OAc−K and Ag-thiourea-K (r=0.92***) or of NH4OAc−K and Morgan's reagent-K (r=0.93***) and fixed NH4−N (r=0.89***). EUF-Ca, EUF-Mg and EUF-Mn do not show any relationship with conventional soil test values. Tea productivity is strongly associated with EUF-N and EUF-P extracted at 20°C.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 99 (1998), S. 37-52 
    ISSN: 1573-2878
    Keywords: Singularly perturbed boundary-value problems ; asymptotic expansions ; boundary layers ; turning points ; exponentially fitted difference schemes ; initial-value techniques ; parallel computation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The initial-value technique that was originally developed for solving singularly-perturbed nonturning-point problems (Ref. 1) is used here to solve singularly-perturbed turning-point problems exhibiting twin boundary layers. In this method, the required approximate solution is obtained by combining solutions of the reduced problem, an initial-value problem, and a terminal-value problem. Error estimates for approximate solutions are obtained. The implementation of the method on parallel architectures is discussed. Numerical examples are presented to illustrate the present technique.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 99 (1998), S. 53-72 
    ISSN: 1573-2878
    Keywords: Singular-perturbation problems ; asymptotic approximations ; boundary layers ; finite-difference schemes ; numerical solution of differential equations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract An improved numerical method for singularly-perturbed two-point boundary-value problems for second-order ordinary differential equations subject to Neumann-type boundary conditions is proposed. In this method, an asymptotic approximation is incorporated into a finite-difference scheme to improve the numerical solution. Uniform error estimates are derived when implemented in known difference schemes. Numerical results are presented in support of the proposed method.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 104 (2000), S. 175-194 
    ISSN: 1573-2878
    Keywords: Singular perturbations ; self-adjoint boundary-value problems ; asymptotic approximations ; boundary layers ; finite-difference schemes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A numerical method for singularly-perturbed self-adjoint boundary-value problems for second-order ordinary differential equations subject to Neumann boundary conditions is proposed. In this method (booster method), an asymptotic approximation is incorporated into a finite-difference scheme to improve the numerical solution. Uniform error estimates are derived for this method when implemented in known difference schemes. Numerical examples are presented to illustrate the present method.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 97 (1998), S. 455-470 
    ISSN: 1573-2878
    Keywords: Singular perturbations ; small parameters ; boundary-value problems ; initial-value problems ; asymptotic expansions ; boundary layers ; exponentially fitted difference schemes ; initial-value techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract An initial-value technique is presented for solving singularly perturbed two-point boundary-value problems for linear and semilinear second-order ordinary differential equations arising in chemical reactor theory. In this technique, the required approximate solution is obtained by combining solutions of two terminal-value problems and one initial-value problem which are obtained from the original boundary-value problem through asymptotic expansion procedures. Error estimates for approximate solutions are obtained. Numerical examples are presented to illustrate the present technique.
    Type of Medium: Electronic Resource
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  • 10
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