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  • Springer  (1,329)
  • 1985-1989  (1,329)
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Year
  • 1
    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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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    The use of the geometrical theory of diffraction in the calculation of antenna patterns of submillimeter and millimeter-wave radiometers (1988)
    Springer
    International journal of infrared and millimeter waves 9 (1988), S. 837-860 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Geometrical Theory of Diffraction is applied in the calculation of the antenna pattern of a submillimetre/millimetre-wave radiometer. Axial symmetry of the radiometer is shown to lead to considerable simplification of the expressions to be evaluated. It is also shown that the sequence of apertures in the radiometer can be chosen to give extremely high rejection of signals incident at off-axis angles greater than 20o.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01010625
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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
    A Submillimeter Homodyne Transmit and Receive System (HTRS) for detecting weak signals from reflectors (1988)
    Springer
    International journal of infrared and millimeter waves 9 (1988), S. 213-229 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A Submillimetre Homodyne Transmit and Receive System has been developed to operate in the 500–2000 GHz region. The system is based around an Optically Pumped Submillimetre laser system and an optical processing system. The system will be described along with our test results which show detectivities of better than −130dBm at 693GHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01010971
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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Failure of tannic acid to inhibit digestion or reduce digestibility of plant protein in gut fluids of insect herbivores (1987)
    Springer
    Journal of chemical ecology 13 (1987), S. 605-621 
    Details
    ISSN: 1573-1561
    Keywords: Tannins ; digestibility-reducing substances ; surfactants ; detergency ; herbivory ; chemical defense ; allelochemics ; Manduca sexta ; Lepidoptera ; Sphingidae ; Schistocerca gregaria ; Orthoptera ; Acrididae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The rate of hydrolysis of the abundant foliar protein, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPC), in enzymatically active gut fluid ofManduca sexta larvae is very rapid and is unaffected by the presence of tannic acid, even when tannic acid is present in the incubation mixture in amounts in excess of the amount of RuBPC. When this protein is dissolved in the denatured gut fluids ofM. sexta larvae orSchistocerca gregaria nymphs, large amounts of tannic acid must be added to bring about the precipitation of significant quantities of protein. The ability of insect gut fluid to prevent the formation of insoluble tannin-protein complexes is due to the presence of surfactants. On the basis of our results and a review of the findings of other investigators, we argue that there is no evidence that tannins reduce the nutritional value of an insect's food by inhibiting digestive enzymes or by reducing the digestibility of ingested proteins and, further, that the failure of tannins to interfere with digestion is readily explained on the basis of well-documented characteristics of the digestive systems of herbivorous insects. In challenging the currently popular notion that tannins are digestibility-reducing substances, we do not challenge the general utility of either the apparency theory or resource availability theory of plant defense. In debating the merits of these two analyses of plant-herbivore interactions, however, the demise of tannins as all-purpose, dose-dependent, digestibility-reducing defensive substances must be taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01880103
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  • 9
    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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  • 10
    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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