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  • Chemistry  (10)
  • Nitrogen fixation  (3)
  • guaianolides  (3)
  • 1
    Digitale Medien
    Digitale Medien
    Three bourbonenolides and other sesquiterpene lactones from two vernonia species
    Amsterdam : Elsevier
    Phytochemistry 20 (1981), S. 2379-2382 
    Details
    ISSN: 0031-9422
    Schlagwort(e): Compositae ; V. profuga ; Vernonia arkansana ; Vernonieae ; bourbonenolides ; glaucolides. ; guaianolides ; sesquiterpene lactones
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)82670-9
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  • 2
    Digitale Medien
    Digitale Medien
    A geranyl nerol derivative and other constituents from Blainvillea latifolia
    Amsterdam : Elsevier
    Phytochemistry 27 (1988), S. 609-610 
    Details
    ISSN: 0031-9422
    Schlagwort(e): Blainvillea latifolia ; Compositae ; diterpene ; geranyl nerol derivative. ; guaianolides ; heliangolides ; sesquiterpene lactones
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(88)83152-2
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  • 3
    Digitale Medien
    Digitale Medien
    Highly oxygenated guaianolides from Bishopanthus soliceps
    Amsterdam : Elsevier
    Phytochemistry 24 (1985), S. 2110-2112 
    Details
    ISSN: 0031-9422
    Schlagwort(e): Bishopanthus soliceps ; Compositae ; eudesmanolides. ; guaianolides ; sesquiterpene lactones
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)83133-7
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  • 4
    Digitale Medien
    Digitale Medien
    Isolation of gas vacuole-less mutants of the blue-green alga Anabaenopsis raciborskii (1976)
    Springer
    Archives of microbiology 111 (1976), S. 195-196 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Mutation ; Blue-green alga ; Anabaenopsis raciborskii ; Gas vacuole ; Nitrogen fixation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract From a bloom forming blue-green alga, Anabaenopsis raciborskii, spontaneous mutants, which had lost the ability to form gas vacuoles have been isolated; the mutant frequency was 4.8×10-3. The filaments of gas vacuole-less mutants settled at the bottom of flasks in liquid culture media unlike the parent alga. The growth and nitrogen fixation were comparatively poor in the mutants.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00446569
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  • 5
    Digitale Medien
    Digitale Medien
    Nitrogen fixation and balance studies of rice soil (1987)
    Springer
    Biology and fertility of soils 4 (1987), S. 15-19 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Nitrogen fixation ; N-balance studies ; Azolla ; Blue-green algae ; Chemical N fertilization ; Rice
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary A nitrogen balance study conducted in ceramic pots under net house conditions for four seasons showed that flooded rice soil leaves a positive nitrogen balance (N increase) in soil after rice cropping in both fertilized and unfertilized soil. Recovery of nitrogen from rice soil was more than its input in unfertilized soil, but it was reverse in fertilized soil. Incorporation of Azolla or BGA twice as basal and 20 days after transplanting (DAT) alone or in combination showed higher nitrogen balance and N2-fixation (N gain) in soil than in that where it was applied once either as basal or 20 DAT. Planted soil showed more N2-fixation than that of fallow rice, and flooded soil fixed more nitrogen in comparison to non-flooded soil in light but less in dark. Soil exposed to light fixed more nitrogen than that of unexposed soil in both flooded and non-flooded conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00280345
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  • 6
    Digitale Medien
    Digitale Medien
    Rice yields as influenced by Azolla N2 fixation and urea N-fertilization (1989)
    Springer
    Plant and soil 114 (1989), S. 63-68 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Azolla pinnata ; Nitrogen fixation ; N yield ; Oryza sativa ; Urea-N
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Application of 0, 30, 60, 90 and 120 kg N ha−1 of urea (U) in split doses with (and without)Azolla pinnata, R. Brown was studied for three consecutive seasons under planted field condition. Fresh weight (FW), acetylene reduction activity (ARA) and N yield of Azolla were found to be maximum 14 days after inoculation (DAI). Among the different treatments, maximum Azolla growth was recorded in no N control. The FW, ARA and N yield of Azolla were inhibited increasingly with the increase in N levels. Irrespective of season, FW and N yield of Azolla were inhibited only a small extent with 90 kg N ha−1 U, beyond which the inhibition was pronounced. ARA was inhibited only slightly up to 60 kg N ha−1 of U. Grain yield and crop N uptake of rice increased significantly up to 90 kg N ha−1 of U (alone or in combination with Azolla) in the dry seasons (variety IR 36) and up to 60 kg N ha−1 U in the wet season (variety CR 1018).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02203082
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  • 7
    Digitale Medien
    Digitale Medien
    Microstructure and mechanical behavior of reinforced reaction injection molded (RRIM) polyurethane (1987)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 27 (1987), S. 1258-1264 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A study was carried out to characterize the microstructure and distribution of some mechanical properties in reinforced reaction injection molding panels (RRIM). The panels were prepared under a variety of processing conditions. Scanning electron microscopy, differential scanning calorimetry, and Fourier transform infrared analysis were employed for microstructure characterization. The following mechanical tests were carried out: dynamic mechanical, tensile, and impact. The results indicate significant relationships between processing conditions, microstructure, and mechanical properties. In particular, the skin/core structure of the panels and the size distribution of bubbles in the matrix have an important effect on the impact properties. Furthermore, the balance between the distributions of cure and crystallinity, which is difficult to define clearly, plays an important role in determining panel behavior.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760271609
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  • 8
    Digitale Medien
    Digitale Medien
    Molecular addition compounds of tin(iv) chloride. I. Preparation and infrared spectra of the complexes of stannic chloride with certain amides (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 332 (1964), S. 103-112 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Darstellung und Eigenschaften von Additionsverbindungen des SnCl4 mit N, N-Dimethylformamid, Acetamid, Acetanilid und Benzamid werden mitgeteilt. Neben der Analyse zeigen auch Donator-Acceptor-Titrationen in Dichloräthan die allgemeine Formel SnCl4 · 2 Amid. Leitfähigkeitsmessungen in Nitromethan und Molekulargewichtsbestimmungen lassen auf das Vorliegen von monomeren Additionsverbindungen schließen. Aus den IR-Spektren geht an Hand einer Erniedrigung der (C—O)- und einer Erhöhung der (C—N)-Valenzschwingung eine Bindung der organischen Liganden an das Zinn über Sauerstoff hervor. Die relativen Basenstärken nehmen in der Reihe Dimethylformamid, Benzamid, Acetanilid, Acetamid ab.
    Notizen: The molecular addition compounds of tin (iv) chloride with N, N-dimethyl formamide, acetamide, acetanilide, and benzamide have been prepared. They are of the type SnCl4 · 2 amide. This composition type has been confirmed by indicator titrations of stannic chloride against amides in dichloroethane. Conductivity measurements in nitromethane and molecular weight determinations show that they are true molecular addition compounds being monomeric.The infrared spectra of the adducts show that there are metal-to-oxygen bonds in all these compounds as is evidenced by a negative shift of the carbonyl stretching frequency and a positive shift of the C—N stretching frequency. The relative donor ability of the amides towards stannic chloride has been found to be: dimethyl formamide 〉 benzamide 〉 acetanilide 〉 acetamide.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19643320112
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  • 9
    Digitale Medien
    Digitale Medien
    Studies on the Hydrazine Complexes of Some Bivalent Metal Ions in aqueous solution (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 349 (1967), S. 213-219 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Für die Hydrazin-Komplexe von Mn(II), Co(II), Ni(II), Cu(II) und Zn(II) werden Zusammensetzung und Bildungskonstanten nach der Methode von Rossotti und Rossotti ermittelt, wobei experimentell pH-Titrationen in Lösungen durchgeführt wurden, die Metall-perchlorat, Hydrazin-diperchlorat und Natriumperchlorat (Ionenstärke μ = 1, t = 30°C) enthalten. In entsprechender Weise wurden die Bildungskonstanten für die Protonisierung von Hydrazin bestimmt. Selbst bei den höchsten Verhältnissen: Gesamt-Hydrazin/Gesamt-Metall (etwa 60) haben die höchsten Komplexe nur bei Co(II) und Zn(II) das Verhältnis:Metall/Hydrazin = 1 : 2, während in allen anderen Fällen in Lösung nur 1 : 1-Komplexe zu existieren scheinen.Die Werte der Bildungskonstanten (30°C, μ = 1) siehe „Summary“.Die nach Bjerrum berechneten β1-Werte sind mit den gefundenen in recht guter Übereinstimmung mit Ausnahme für Co(II). Die Grenzen für die Bjerrum-Methode werden diskutiert.
    Notizen: The compositions and formation-constants of the complexes formed by Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with hydrazine have been evaluated graphically following the method of Rossotti and Rossotti using the necessary data from the results of pH titration of solutions containing the metal perchlorate, hydrazinium diperchlorate and sodium perchlorate at an ionic strength of unity at 30°C. The values of the successive equilibrium constants for the protonation of hydrazine, which were also needed, have been evaluated separately by similar procedure. Even at the rather high ratio of ca. 60 of (total hydrazine)/(total metal) the highest complexes which appear to be formed in the systems investigated have the ratio of metal:hydrazine of 1:2 for Co(II) and Zn(II), while in all the other cases only 1: 1 complexes appear to exist in solution.The values of the formation-constants (at 30°C; μ = 1) obtained are: \documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{l} \log \beta _1 :{\rm Mn(II), 4}{\rm .76; Co(II), 1}{\rm .78; Ni(II),3}{\rm .18; Cu(II),6}{\rm .67;Zn(II), 3,69}{\rm.} \\ \log \beta _2 :{\rm Co(II), 3}{\rm .34; Zn(II), 6}{\rm .69}. \\ \end{array} $$\end{document}β1 values obtained from the Bjerrum relation are in fairly good agreement with those given above except for Co(II). The limitations of Bjerrum's method are discussed.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19673490314
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  • 10
    Digitale Medien
    Digitale Medien
    Studies on MM″(NCS)4 [M=Ni(II), Fe(II), Zn(II), and M″=Hg(II) Zn(II)] complexes (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 423 (1976), S. 173-179 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Untersuchungen an MM″ (NCS)4-Komplexen (M = NiII, FeII, ZnII; M″ = HgII, ZnII)Komplexe des Typs MM′(NCS)4 · xL M = NiII, FeII, ZnII; M″ = HgII, ZnII; x = 2, 4, 6; L = Nicotinamid (nia), Isonicotinsaiurehydroxid (inh) 2-Aminopyrimidin (2apm)] wurden dargestellt und charakterisiert durch Elementaranalyse, molare Leitfähigkeit, magnetisches Moment, IR- und Elektronenspektren.
    Notizen: Coordination complexes of the type MM″(NCS)4 · xL M = Ni(II), Fe(II), Zn(II), M″ = Hg(II), Zn(II), x = 2, 4, 6 and L = nicotinamide (nia), 3-cyanopyridine (3-cpy), 4-cyanopyridine (4cpy), 4-aminopyridine (4apy), isonicotinic acid hydrazide (inh), 2-aminopyrimidine (2apm)l have been prepared and characterized by elemental analysis, molar conductance, magnetic moment, infrared and electronic spectral studies. Molar conductance data of NiZn(NCS), complexes are equivalent to 1:1 electrolyte. The infrared spectral studies indicate that only bridged thiocyanate groups are present in the complexes of the type NiHg(SCN)4 · 4L [L=3 and 4cpy, inh] and FeHg(SCN)4 · 2L [L = nia, 2apm], whereas both bridged and terminal thiocyanates are present in the complexes of the type NiHg(SCN)4 · 4L [L = nia, 3apy and ZnHg(SCN)4 · 2(inh). BOHR magneton values and electronic spectral data indicate an octahedral environment around nickel and iron in their complexes. Symmetry and group theory have also been used to establish the structure of the complexes.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19764230211
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