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  • Springer  (2,040)
  • 1985-1989  (1,329)
  • 1970-1974  (526)
  • 1960-1964  (185)
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  • 1
    Electronic Resource
    Electronic Resource
    Crystal structures and thermal decomposition oftrans-Pd(Creat)2Cl2·2H2O andcis-Pt(Creat)2I2·3H2O (1988)
    Springer
    Monatshefte für Chemie 119 (1988), S. 1189-1199 
    Details
    ISSN: 1434-4475
    Keywords: Creatinine ; Palladium(II) complexes ; Platinum(II) complexes ; Crystal structures ; Thermal analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden neue Komplexe der Formelntrans-Pd(Creat)2Cl2·2H2O (I) undcis-Pt(Creat)2I2·3H2O (II) hergestellt und ihre Strukturen und Stabilitäten mittels Röntgenstrukturanalyse bzw, thermischer Analyse untersucht. Beide Komplexe haben quadratisch-planare Struktur, die zwei Cl-Atome und die N1-Creatinin-Atome sind an Pd intrans-Konfiguration koordiniert, währenddessen in VerbindungII die I-Atome und die N1-Atome incis-Konfiguration zueinander stehen. Trotz früherer Differenzen zeigen die TG- und DTA-Kurven der Komplexe, daß ihre Stabilitäten sehr ähnlich sind. Da besonders inII ein ausgedehntes Wasserstoffbindungssystem vorhanden ist, werden auch mögliche Konsequenzen bezüglich biologischer Wirksamkeit kurz diskutiert.
    Notes: Abstract New complexes of the formulaetrans-Pd(Creat)2Cl2·2H2O (I) andcis-Pt(Creat)2I2·3H2O (II) have been prepared and their structures and stabilities studied by X-ray diffraction and thermal analysis. Both compounds have a squareplanar geometry, the two Cl atoms and N1 creatinine atoms are coordinated to Pd intrans configuration, while in compoundII the I atoms and N1 atoms are coordinated incis configuration. In spite of the earlier differences, the TG and DTA curves of the complexes show that their stability is very similar. Since an extended hydrogen bond system is present in the crystals, especially inII, the possible consequences in biological media are discussed briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00808300
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  • 2
    Electronic Resource
    Electronic Resource
    A multi-slit spectrograph and Hα Doppler system (1974)
    Springer
    Solar physics 37 (1974), S. 343-350 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A multiple entrance slit spectrograph was built for time-lapse photography of the spectra of flares and other transient solar phenomena. This spectrograph employs narrow-band filters to limit the wavelength range of the spectrograph to several angstroms centered at Hα or other spectral lines. The passband of the filter, and the dispersion of the spectrograph determine the number of parallel slits through which light may be passed to achieve multiple adjacent spectral displays. By using a 7 Å filter, a dispersion of 10.8 Å mm−1, and 35 mm film, adjacent Hα spectra are imaged from 30 parallel slits. A system of mirrors and relay lenses transfers the slitjaw image to the same film plane as the spectral image. A 2 frame camera is used to simultaneously record both images on adjacent frames. Filtering of the reference spatial image to 1.0 Å allows the observer to see the position of the slits relative to the Hα centerline structure and to match the brightness of the spatial image to the spectral display. A polarizing beamsplitter, prior to the slits, provides a prefiltered second solar image to a narrow band Hα Doppler filter for simultaneous photography in the wings of the Hα line. The multislit monochromatic spectrograph and Hα Doppler system constitute a flexible instrument in which components may be substituted to achieve different passbands width, image scales, dispersions and corresponding numbers and spacings of adjacent spectra at a selected wavelength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152493
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of cinnamoyl putrescines on in vitro cell multiplication and differentiation of tobacco explants (1985)
    Springer
    Plant cell reports 4 (1985), S. 158-160 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hydroxycinnamoyl putrescines promote the cell multiplication of leaf discs of a tobacco mutant, RMB7, cultivatedin vitro on the Murashige and Skoog medium. This mutant never accumulates these molecules during its development and does not enter in floweirng. Maximal effect is obtained at 2.5·10−4M. The same molecules inhibit bud formation ofNicotiana tabacum var. Xanthi nc, at 5·10−5 M but promote callus formation. From 10−4 M to 5·10−3 M they strongly inhibit cell multiplication and bud formation without toxic effect. Their possible role in plant metabolism is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00571306
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  • 4
    Electronic Resource
    Electronic Resource
    Transfer of a time-signal isochronous with local time in translocation experiments to the geographical longitude (1987)
    Springer
    Journal of comparative physiology 160 (1987), S. 3-9 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary When mushroom-bodies of time-trained honeybees are translocated according to the geographical longitude — the latitude remains nearly the same — and are implanted to naive host animals the information on time is transferred as an information on local time, i.e. the time-signal learned by the donor animal breaks through in the host animal isochronous with local time and not as an endogenously driven circadian rhythm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00613436
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetic analysis of thermal decomposition of praseodymium(III) nitrate hexahydrate (1989)
    Springer
    Journal of thermal analysis and calorimetry 35 (1989), S. 805-813 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mittels isothermer und dynamischer thermogravimetrischer Methoden wurde die Kinetik der thermischen Zersetzung des Hexahydrates von Praseodymnitrat untersucht. Eine kinetische Auswertung der isothermen Meßdaten unter Anwendung verschiedener Feststoffreaktionsmodelle ergab, daß die Reaktion am besten durch ein phasengrenzenkontrolliertes Randomkeimbildungsmodell beschrieben werden kann. Die kinetische Auswertung der dynamischen TG-Kurven wurde diskutiert und ein kritischer Vergleich zwischen zwei Integriermethoden, der von Coats und Redfern und der von Ozawa, angestellt. Die Betrachtungen ergaben, daß die Methode von Ozawa eine bessere Korrelation liefert und daß die Resultate gut mit denen der isothermen thermogravimetrischen Messungen übereinstimmen.
    Abstract: Резюме Методом изотермичес кой и динамической термогравиметрии из учена кинетика термического разлож ения гексагидрата ни трата празеодима. Кинетиче ский анализ изотермических данн ых, проведенный с испо льзованием различных моделей тв ердотельных реакций, показал, что р еакция наилучшим обр азом описывается моделью контролируемой межфазовой границы и моделью произвольно го образования центров кристаллизации. Обсужден кинетическ ий анализ динамическ их кривых ТГ и проведено критичес кое сопоставление интегральных методо в Коуэтса-Рэдферна и О завы. Результаты показали, что метод Озавы дает лучшую кор реляцию и результаты хорошо согласуются с данным и, полученными методом изотермичес кой термогравиметри и.
    Notes: Abstract The kinetics of thermal decomposition of praseodymium(III) nitrate hexahydrate was studied by using isothermal and dynamic thermogravimetric techniques. Kinetic analysis of the isothermal data with respect to various solid-state reaction models showed that the reaction is best described by phase boundary-controlled and random nucleation models. Kinetic analysis of the dynamic TG curves was discussed and a critical comparison was made of two integral methods, that of Coats and Redfern and that of Ozawa. The results showed that the Ozawa method gives a better correlation, and the results are in good agreement with those obtained under isothermal thermogravimetric conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02057236
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  • 6
    Electronic Resource
    Electronic Resource
    Molecular cloning of two isoinhibitor forms of chymotrypsin inhibitor 1 (CI-1) from barley endosperm and their expression in normal and mutant barleys (1988)
    Springer
    Plant molecular biology 10 (1988), S. 521-535 
    Details
    ISSN: 1573-5028
    Keywords: barley ; chymotrypsin inhibitor ; gene expression ; endosperm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Full-length cDNA clones for barley chymotrypsin inhibitor 1 (CI-1) have been isolated from an endosperm-specific cDNA library. Hybridization and nucleotide sequence analyses indicate that these cDNAs represent two distinct types of CI-1 mRNA which we have called CI-1A and CI-1B. Both mRNAs encode polypeptides of 83 residues (M r=8790 and 8960) which differ at eleven positions. The full-length cDNA sequences do not predict N-terminal signal peptide extensions indicating that CI-1 is synthesized in the mature form in contrast to the homologous proteinase inhibitors of tomato and potato. Northern hybridization experiments show that the CI-1 genes are under strict developmental and organ-specific control. CI-1 transcripts were first detected in the developing barley endosperm between 12 and 14 days after anthesis but no CI-1-related sequences were detected in the RNA preparations from shoots, leaves or roots. The expression of CI-1 was also studied in the high-lysine barley mutants Hiproly, Risø 56 and Risø 1508. Approximately 15-fold (Hiproly) and 4-fold (Risø 56 and 1508) higher levels of CI-1 mRNA were detected in the mutant endosperms compared to normal barley. These results correlate well with the increased deposition of CI-1 in the high-lysine lines and show that the differential expression is controlled mainly at the level of transcription or stability of the mRNA. Using Southern-blots of barley DNA we estimate that there are three copies of CI-1 per haploid genome in both normal and mutant barley lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033607
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  • 7
    Electronic Resource
    Electronic Resource
    Mapping of Rhizobium japonicum nifB-,fixBC-, and fixA-like genes and identification of the fixA promoter (1985)
    Springer
    Molecular genetics and genomics 199 (1985), S. 315-322 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary New DNA regions likely to be involved in symbiotic nitrogen fixation were identified and mapped, by interspecies hybridization, on cloned DNA from the slowgrowing Rhizobium japonicum strain 110. NifB-and fixBC-like genes were located near the nifH and nifDK operons encoding the nitrogenase polypeptides, whereas a fixA-like gene is not linked to this cluster. NifB was detected by interspecies hybridization with a Klebsiella pneumoniae nifA/nifB probe, and its identity was confirmed due to its homology with the Rhizobium leguminosarum nifB gene. NifB of R. japonicum was located between nifDK and nifH at a distance of 11 kb downstream from the 3′ end of nifK. Using the Rhizobium meliloti fixABC operon as heterologous probe it was found that, in R. japonicum, fixA is distantly separated from fixBC. FixB and fixC are probably contained together in one operon (fixBC). The approximate start of fixB was located 2.8 kb downstream of the 3′ end of nifH. All genes of the nifDK-nifB-nifH-fixBC cluster are transcribed in the same direction. The DNA region harboring fixA was identified in a cosmid clone bank. The promoter and transcription start site of fixA were sequenced and mapped by a nuclease S1 protection experiment. The promoter sequence (5′-ATGGTAC-5bp-TTGCT-3′) is very similar to the nif-type consensus promoter sequence. Hence, the expression of R. japonicum nif and fix genes may be regulated coordinately.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330274
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  • 8
    Electronic Resource
    Electronic Resource
    Positional requirements for the function of nif-specific upstream activator sequences (1987)
    Springer
    Molecular genetics and genomics 210 (1987), S. 140-144 
    Details
    ISSN: 1617-4623
    Keywords: Transcriptional Activation ; Upstream sequences
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The upstream activator sequence (UAS) found in Klebsiella pneumoniae nif promoters and required for the activation of transcription by nifA, is absent from the nifF-nifL intergenic region, but is present downstream from the nifLA transcription start at+59. To determine whether nif upstream activator sequences can function in a 3′ position, the nifH UAS was cloned downstream from the NifH transcription start, but no activation of transcription by nifA dependent upon the UAS in its 3′ location could be detected. A mild repressive effect was detectable when the nifH UAS was placed downstream of the nifH promoter, but not when the cat promoter was substituted for the nifLA promoter upstream from the motif at+59 described above. However, deletion analysis showed that the UAS motif located downstream of the nifLA promoter has a role in transcription from the nifF promoter, although it is situated at position-263 with respect to the nifF transcription start, about 100 bp further upstream than previously described occurrences of the activator sequence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00337770
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  • 9
    Electronic Resource
    Electronic Resource
    New polyester arterial prostheses from great britain: anin vitro andin vivo evaluation (1986)
    Springer
    Annals of biomedical engineering 14 (1986), S. 351-367 
    Details
    ISSN: 1573-9686
    Keywords: Arterial prosthesis ; Poly(ethylene terephthalate) ; Warp-knit polyester fabric ; Thoracoabdominal bypass graft ; Polyester fibers ; Dimensional stability ; Histologic evaluation ; Animal models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Two models of knitted velour polyester prostheses have been developed in Great Britain, i.e. the VP1200K and the VP50K Triaxial. The evaluation of these new devices in vitro and in vivo in dogs has demonstrated that, while the first model has similar surgical, mechanical and healing characteristics in the short term to other commercial knitted velour prostheses, the second model has lower water permeability and superior strength and dimensional stability. On the basis of these results, clinical investigations can be undertaken.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02367408
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of surfactants, pH, and certain cations on precipitation of proteins by tannins (1985)
    Springer
    Journal of chemical ecology 11 (1985), S. 485-494 
    Details
    ISSN: 1573-1561
    Keywords: Tannins ; digestibility-reducing substances ; surfactants ; detergency ; RuBPC ; herbivory ; chemical defense ; allelochemics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Tannic acid and pin oak tannins precipitate large amounts of the abundant leaf protein, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPC), over a wide pH range (6.15–9.30) in the presence of sodium, potassium, magnesium, and calcium ions at concentrations comparable to those reported in the gut fluids of lepidopteran herbivores. The presence of lysolecithin, a surfactant known to be present in the gut fluids of some insects, significantly reduces the amount of RuBPC precipitated under these conditions. We conclude that high detergency is far more effective than high alkalinity in countering the potential protein-precipitating properties of tannins. We further conclude that tannins do not deserve the status they were once accorded as general, all-purpose, dose-dependent, antidigestive defensive chemicals. We also describe the application of the Schaffner-Weissman protein assay for studying the protein-precipitating capacity of plant extracts. This method is far superior to the one we have used in our earlier studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989559
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