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  • 1
    Digitale Medien
    Digitale Medien
    Accurate mapping of the Escherichia coli pepD gene by sequence analysis of its 5′ flanking region (1989)
    Springer
    Molecular genetics and genomics 215 (1989), S. 369-373 
    Details
    ISSN: 1617-4623
    Schlagwort(e): pepD gene ; gpt gene ; Intergenic region ; lpcA locus ; Peptidase D purification
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary A cloned DNA fragment, carrying the gene for peptidase D (pepD) of Escherichia coli, was partially sequenced. By purification of peptidase D and sequence determination of an amino-terminal oligopeptide the reading frame of the pepD gene, starting with a GTG initiator codon, was unambiguously identified. An overlap of the established nucleotide sequence with the previously sequenced 5′ flanking region of the gpt gene allowed the exact distance between pepD and gpt to be calculated. The two genes are pointing towards each other and are separated by 260 bp. A search for open reading frames (ORFs) and the analysis of possible codon usage in the intercistronic region indicate the absence of an additional gene (lpcA) between pepD and gpt.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00427031
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  • 2
    Digitale Medien
    Digitale Medien
    Pyrrolo[1,2-b]-1,3,4-thiadiazol-Derivate aus mesomeren Heteropentalenen und Azodicarbonestern (1988)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 95-104 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Pyrrolo[1,2-b]-1,3,4-thiadiazole Derivatives from Mesomeric Heteropentalenes and Azodicarboxylic EstersThe mesomeric heteropentalene betaines of type 4, 7, and 18 display an unusual reaction behavior against the azodicarboxylic esters 8a-c. Surprisingly, 4 reacts with 8a, b to produce 17a, b, whereas the reaction of 4 with 8c leads to 11 and the novel azomethine imine 15. Also the reaction of 18 with 8a-c gives in two cases 20 or 25 beside the azomethine imine 19. Furthermore, 7 reacts with 8a to form 26, whereas the reaction of 7 with 8c surprisingly yields 29. Spectroscopic data as well as the results of the X-ray analyses of 17a and 19 are consistent with the structures.
    Notizen: Die mesomeren Heteropentalen-Betaine vom Typ 4, 7 und 18 reagieren mit den Azodicarbonestern 8a-c ungewöhnlich. So liefert 4 mit 8a, b überraschend 17a, b, während die Umsetzung von 4 mit 8c zu 11 und dem neuen Azomethin-imin 15 führt. Auch die Reaktionen von 18 mit 8a-c ergeben neben dem Azomethinimin 19 noch in zwei Fällen 20 oder 25. Weiterhin reagiert 7 mit 8a zu 26, wogegen die Umsetzung von 7 mit 8c überraschend zu 29 führt. Spektroskopische Daten sowie die Ergebnisse der an 17a und 19 durchgeführten Röntgenstrukturanalyse belegen die Konstitutionen.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19881210115
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  • 3
    Digitale Medien
    Digitale Medien
    Thieno[3,4-f]-2,1-benzisothiazol.  -  Synthese und physikalische Eigenschaften eines neuen kondensierten 14π-Heteroarens sowie dessen thermisches Cycloadditions-verhalten gegenüber N,N-Doppelbindungssystemen (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 3158-3164 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Thieno[3,4-f]-2,1-benzisothiazole.  -  Synthesis and Physical Properties of a Novel Fused 14π Heteroarene as well as its Thermal Cycloaddition Reactions with N,N-Double Bond SystemsThe synthesis of the novel condensed title compound 2, which contains three masked dipolar systems, as well as its cycloaddition reactions with 1,2,4-triazoline-3,5-diones 3a, b and azo-dicarboxylic esters 5a, b with formation of 4 and 6, respectively, are described.
    Notizen: Die Darstellung der neuen kondensierten Titelverbindung 2, die drei maskierte dipolare Systeme beinhaltet, sowie deren Cycloadditionen an 1,2,4-Triazolin-3,5-dione 3a, b und Azo-dicarbonester 5a, b unter Bildung von 4 bzw. 6 werden beschrieben.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19861191023
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  • 4
    Digitale Medien
    Digitale Medien
    ESR-spektroskopische Untersuchungen an Thioamiden, VI. Radikalanionen der N,N-Dialkylbenzamide, -thiobenzamide und -selenobenzamide (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 1931-1944 
    Details
    ISSN: 0170-2041
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: ESR Studies in the Thioamide Series, VI.  -  Radical Anions of N,N-Dialkylbenzamides, -thiobenzamides, and -selenobenzamidesRadical anions of the title compounds 1-9 were generated by in-situ electroreduction and studied by ESR spectroscopy. Earlier assignments and interpretations of hfs splittings are partly revised. The radical anions of benzamides exhibit nonequivalency of the respective ortho and meta position in contrast to the higher homologues. - It is shown, that CSNR2 and CSeNR2 groups withdraw a great deal of spin density from the aromatic ring and are thus comparable with the nitro group.
    Notizen: Durch in-situ-Elektroreduktion erzeugte Radikalanionen von Benzamiden 1-3, Thiobenzamiden 4-6 und Selenobenzamiden 7-9 werden ESR-spektroskopisch untersucht (Abbildungen 1 - 4). Dabei werden frühere Zuordnungen und Interpretationen von Hyperfeinstruktur-Aufspaltungen teilweise revidiert. Bei den Benzamid-Radikalanionen besteht bei Raumtemperatur Nichtäquivalenz der jeweiligen ortho- und meta-Positionen, bei den höheren Homologen dagegen nicht.  -  Es wird gezeigt, daß die CSNR2- und CSeNR2-Gruppen als Substituenten in aromatischen Radikalanionen dem Benzolring viel Spindichte entziehen und in dieser Hinsicht der Nitrogruppe ähneln.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jlac.197919791202
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  • 5
    Digitale Medien
    Digitale Medien
    Reaktionen eines Thieno[3,4-c]isothiazols mit 1,2,4-Triazolin-3,5-dionen und Alkinen (1986)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 1796-1803 
    Details
    ISSN: 0170-2041
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Reactions of a Thieno[3,4-c]isothiazole with 1,2,4-Triazoline-3,5-diones and AlkynesThe reactions of the title compound 1 with the 1,2,4-triazoline-3,5-diones 4a, b as well as with dibenzoylethyne and bis(diethylamino)ethyne lead to the formation of the heterocycles 5, 7, and 12.
    Notizen: Die Reaktionen der Titelverbindung 1 mit den 1,2,4-Triazolin-3,5-dionen 4a, b sowie mit Dibenzoylethin und Bis(diethylamino)ethin führen zu den Heterocyclen 5, 7 und 12.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jlac.198619861013
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  • 6
    Digitale Medien
    Digitale Medien
    Single-step electrotransfer of reverse-stained proteins from sodium dodecyl sulfate-polyacrylamide gel onto reversed-phase minicartridge and subsequent desalting and elution with a conventional high-performance liquid chromatography gradient system for analysis (1995)
    Weinheim : Wiley-Blackwell
    Electrophoresis 16 (1995), S. 911-920 
    Details
    ISSN: 0173-0835
    Schlagwort(e): Sodium dodecyl sulfate-polyacrylamide gel electrophoresis ; Reverse staining ; Protein microanalysis ; High-performance liquid chromatography ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Isolation of proteins from polyacrylamide electrophoresis gels by a novel combination of techniques is described. A given protein band from a reverse stained (imidazol-sodium dodecyl sulfate - zinc salts) gel can be directly electrotransferred onto a reversed-phase chromatographic support, packed in a self-made minicartridge (2 mm in thickness, 8 mm in internal diameter, made of inert polymeric materials). The minicartridge is then connected to a high-performance liquid chromatography system and the electrotransferred protein eluted by applying an acetonitrile gradient. Proteins elute in a small volume (〉 700 μL) of high-purity volatile solvents (water, trifluoroacetic acid, acetonitrile) and are free of contaminants (gel contaminants, salts, etc). Electrotransferred proteins were efficiently retained, e.g., up to 90% for radioiodinated α-lactalbumin, by the octadecyl matrix, and their recovery on elution from the minicartridge was in the range typical for this type of chromatographic support, e.g., 73% for α-lactalbumin. The technique was successfully applied to a variety of proteins in the molecular mass range 6-68 kDa, and with amounts between 50 and 2000 pmol. The good mechanical and chemical stability of the developed minicartridges, during electrotransfer and chromatography, allowed their repeated use. This new technique permitted a single-step separation of two proteins unresolved by sodium dodecyl sulfate-polyacrylamide gel electrophoresis due to their different elution from the reversed-phase support. The isolated proteins were amenable to analysis by N-terminal sequencing, enzymic digestion and mass spectrometry of their proteolytic fragments. Chromatographic elution of proteins from the reversed-phase mini-cartridge was apparently independent of the specific loading mode employed, i.e., loading by conventional loop injection or by electrotransfer.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/elps.11501601154
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  • 7
    Digitale Medien
    Digitale Medien
    Understanding the mechanism of the zinc-ion stains of biomacromolecules in electrophoresis gels: Generalization of the reverse-staining technique (1998)
    Weinheim : Wiley-Blackwell
    Electrophoresis 19 (1998), S. 2398-2406 
    Details
    ISSN: 0173-0835
    Schlagwort(e): Detection ; Imidazole ; Negative staining ; Lysozyme ; Inflammation ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: We have recently shown that a few nanograms of protein separated by electrophoresis in sodium dodecyl sulfate-polyacrylamide gels can be detected by reverse-staining, exploiting the precipitation reaction between zinc(II) and imidazole. Modifications of this method have also been generated to detect gelisolated nucleic acids and bacterial glycolipids. Because there is no recourse to chemical modifiers, the reverse-staining technique has been valuable when micropreparing these biomacromolecules for later use or characterization. The mechanism underlying the reverse-staining effect, however, remains incompletely understood and this has prevented a further generalization of the technique. Here, we have conducted physicochemical experiments and identified zinc imidazolate (ZnIm2) as the main component of the precipitate that forms along the surface of zinc-imidazole reverse-stained gels. Many staining effects observed when gels containing electrophoretically separated biopolymers are subjected to zinc-imidazole stains have been rationalized. The reverse-staining method has been vastly generalized, now allowing the detection of proteins and glycolipids as well as complexes of these macromolecules in native gels. We demonstrate the application of the reverse-staining technique in situations where Coomassie blue or silver staining was inappropriate or failed to produce detection of the species of interest. The present generalization of the reverse-staining method facilitated the characterization of biomacromolecular interaction partners in mixtures of bacterial glycolipids and human tears.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/elps.1150191407
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