Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    International Journal of Psychophysiology 9 (1990), S. 75-80 
    ISSN: 0167-8760
    Keywords: Activation process ; Electroencephalogram ; Heart rate ; Motor imagination ; Respiration cycle ; Skin conductance
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine , Psychology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Biology and fertility of soils 12 (1991), S. 122-126 
    ISSN: 1432-0789
    Keywords: Biological activity ; Soil respiration ; Field method ; CO2-release
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Soil respiration was investigated in three loamy Orthic Luvisols (two arable, one forest soil), three sandy Haplic Podzols (also two arable, one forest soil) with a modified intersite method according to Lundegardh (1924). The method allows characterization of the CO2-flux from the soil and interpretation of the different levels with regard to temperature, nutrient and air supply. The method is sensitive to tillage and fertilization effects. In the two arable Luvisols the mean cumulative respiration rate was not uniform compared with the forest soil; in one case it was much higher and in another much lower. CO2 evolution in the Podzol under spruce was much lower than in the two arable Podzols. In the sandy Podzols 5 replicate measurements gave adequate results, with an error probability of 10%, but in the loamy Luvisols it was necessary to use 10 replicates to specify the same degree of difference. If soil respiration is very high, immediately after fertilization with cattle slurry or dung on arable land, or after litterfall in a deciduous forest, more replicates are necessary.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Biology and fertility of soils 13 (1992), S. 242-247 
    ISSN: 1432-0789
    Keywords: Biological activity ; P availability ; Microbial biomass ; Alkaline phosphatase activity ; Dehydrogenase activity ; Soil cultivation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In Ap horizons of typical arable soils under cereals in Northwest Germany, biological activity was estimated by measuring microbial activity. Twelve soils on local farms and six soils on a research farm were analysed. Microbial biomass, dehydrogenase activity, and alkaline phosphatase activity were compared with the biological availability of P, an index describing the relationship among several P fractions that has been used in ecological agriculture. The correlation between the microbial biomass and dehydrogenase and alkaline phosphatase activity was strong but the correlation between the biological availability of P and the enzyme activities was weak. In contrast, in the farm fields, there was a significant correlation between the microbial biomass and the biological availability of P. The correlation between the biological availability of P and pH was highly significant (r=0.65–0.93***). Explanations for these correlations are discussed and proposals for further investigations are made. (1) Is the pH effect a direct chemical one or an indirect biological one? (2) Which soil organisms affect the biological availability of P in contrast to the microbial biomass, dehydrogenase activity, and alkaline phosphatase activity? (3) Is the method suitable for the investigation of all arable soils?
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dithiazolium Salts of Halometalates - Synthesis and Structure of 3-Diethylamino-5-phenyl-1,2,4-dithiazolium-tetrachloroniccolate (II)Chlorination of NiII-coordinated 1,1-diethyl-3-benzoyl-thiourea by SOCl2 in acetonitrile yields turquoise 3-diethyl-amino-5-phenyl-1,2,4-dithiazolium-tetrachloroniccolate. Its reduction produces cis-bis-(1,1-diethyl-3-thiobenzoylthioureato)nickel(II). The mechanism of formation as well as the crystal and molecular structure of the title compound are presented.
    Notes: Die Chlorierung von an NiII innerkomplex gebundenem 1,1-Diethyl-3-benzoylthioharnstoff mittels SOCl2 führt in Acetonitril zu türkisem 3-Diethylamino-5-phenyl-1,2,4-dithiazolium-tetrachloroniccolat, aus dem durch Reduktion cis-Bis-(1,1-diethyl-3-thiobenzoyl-thioureato)nickel(II) zugänglich ist. Der Bildungsmechanismus des Dithiazoliumsalzes wird erörtert und die Kristall- und Molekülstrukturanalyse vorgestellt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 580 (1990), S. 167-174 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal and Molecular Structure of Tris(1,1-diethyl-3-benzoyl-thioureato)ruthenium(III)The crystal and molecular structure of tris(1,1-diethyl-3-benzoyl-thioureato)-ruthenium(III) has been determined by an X-ray structure analysis. The compound crystallizes in the trigonal space group P3 with a = 16.556, c = 8.476 Å and Z = 2. The structure was solved by Patterson methods and refined to a final R value R = 0.074 for 801 observed reflections. The molecule has the symmetry C3. The coordination polyhedron is an octahedron with facial arrangement of the ligator atoms. The Ru—S and Ru—O distances are 2.293 Å and 2.047 Å, respectively.
    Notes: Die Kristall- und Molekülstruktur von Tris(1,1-diethyl-3-benzoyl-thioureato)ruthenium(III) wurde durch Röntgenkristallstrukturanalyse bestimmt. Die Verbindung kristallisiert trigonal in der Raumgruppe P3 mit den Gitterkonstanten a = 16,556, c = 8,476 Å und Z = 2. Die Struktur wurde mittels Patterson-Methoden gelöst und bis zu einem abschließenden R-Wert R = 0,074 für 801 beobachtete Reflexe verfeinert. Das Molekül besitzt die Symmetrie C3. Das Koordinationspolyeder ist ein Oktaeder mit facialer Anordnung der Ligator-Atome. Die Ru—S- und Ru—O-Abstände betragen 2,293 Å bzw. 2,047 Å.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 586 (1990), S. 79-86 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Structure of Bis(3-diethylamino-5-phenyl-1,2,4-dithiazolium)-tetrachlorocobaltat(II)The title compound 1 was prepared by reaction of Tris(1,1-diethyl-3-benzoyl-thioureato)cobalt(III) with SOCl2 in acetonitrile. 1 has been characterized by IR-spectroscopy and VIS-spectroscopy.The structure of 1 has been determined by an X-ray structure analysis. The compound crystallizes in the monoclin space group C2/c with a = 16.224; b = 11.257; c = 17.697 Å; β = 107,43° and Z = 4. The final R value was R = 0.027 for 2073 observed reflections.The cation of 1 is nearly plane with an extended delocalization of electrons. The CoCl42- anion is tetrahedral with two different long Co—Cl pairs. Interionic contacts S … Cl exists between the structural units of the cations and the anion.
    Notes: Die Darstellung der Titelverbindung 1 erfolgt aus Tris(1,1-diethyl-3-benzoyl-thioureato)-cobalt(III) mit SOCl2 in Acetonitril. 1 wird IR-spektroskopisch und durch VIS-Spektren charakterisiert.Die Struktur von 1 wurde durch Röntgenkristallstrukturanalyse bestimmt. Die Verbindung kristallisiert monoklin in der Raumgruppe C2/c mit den Gitterkonstanten a = 16,224; b = 11,257; c = 17,697 Å, β = 107,43° und Z = 4. Der abschließende R-Wert betrug R = 0,027 für 2073 beobachtete Reflexe.Das Kation von 1 ist nahezu planar und weist eine weitreichende Elektronendelokalisierung auf. Das CoCl42--Anion ist tetraedrisch strukturiert und besitzt zwei unterschiedlich lange Co—Cl-Paare. Zwischen Kation- und Anion-Struktureinheiten bestehen über S und Cl interionische Wechselwirkungen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cis-Trans Isomerism in N-Thioacyl Thiourea Chelates: The Structure of cis-Bis(l,l-diethyl-3-thiobenzoyl-thioureato)nickel(II)In addition to two crystalline modifications in which the ligands are arranged in trans position, bis(1,1-diethyl-3-thiobenzoyl-thioureato)nickel(II) forms a further modification with cis position of the ligands whose structure has been confirmed by an X-ray structure analysis. It crystallizes in the space group P21/c with a=11.316, b=17.981, c=14.331 Å,β=111.85° and Z=4. The coordination is slightly tetrahedrally distorted. Bond lengths and angles are in good agreement with those of the trans modifications. The average Ni—S bond length is 2.167 Å.
    Notes: Bis(1,1-diethyl-3-thiobenzoyl-thioureato)nickel(II) bildet neben zwei kristallinen Modifikationen, in denen die Liganden in trans-Stellung am Nickel-Atom angeordnet sind, auch eine Modifikation mit cis-Stellung der Liganden, deren Struktur mittels Röntgenstrukturanalyse bestätigt wird. Sie kristallisiert in der Raumgruppe P21/c mit den Gitterkonstanten a=11,316, b=17,981, c=14,331 Å,β=111,85° und Z=4. Die Koordination ist leicht tetraedrisch verzerrt. Bindungslängen und-winkel stimmen gut mit denen der trans-Modifikationen überein. Die mittlere Ni—S-Bindungslänge beträgt 2,167 Å.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 0044-2313
    Keywords: Nickel(II) chelates ; syntheses ; crystal structures ; FAB mass spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Di- and Trinuclear Nickel(II) Chelates of Bis-bidentate N-AcylselenoureasBis-bidentate isophthaloyl-bis(selenoureas) form with nickel(II) ions under deprotonating conditions macrocyclic dinuclear metal chelates. This was confirmed by X-ray crystal structure analysis of the cyclo-di[nickel-μ-[1,1,1′,1′-tetraisobutyl-3,3′-iso-phthaloyl-bis-selenoureato(2-)Se,O:O′, Se′]], 2. The compound 2 crystallizes in the monoclinic space group P 21/c with a = 11.673 (1); b = 19.834 (2); c = 13.606 (1) Å; β = 107.45 (1)° and Z = 2. The final R value was R = 0.081 for 3049 observed reflections.Bis-bidentate terephthaloyl-bis(selenoureas) give under the same conditions macrocyclic trinuclear nickel(II) chelates.Both types of the complexes are characterized by FAB mass spectra.
    Notes: Bis-bidentate Isophthaloyl-bis(selenoharnstoffe) bilden mit Nickel(II)-Ionen unter deprotonierenden Bedingungen makrocyclische Zweikernchelate. Dies wurde durch Röntgenkristallstrukturanalyse des cyclo-Di[nickel-μ-[1,1,1,′,1′-tetraisobutyl-3,3′-iso-phthaloyl-bisselenoureaoto(2-)-Se, O:O′, Se′]], 2, bestätigt. Die Verbindung 2 kristallisiert monoklin in der Raumgruppe P 21/c mit den Gitterkonstanten a = 11,673 (1); b = 19,834 (2); c = 13,606 (1) Å; β = 107,45 (1)° und Z = 2. Der abschließende R-Wert betrug R = 0,081 für 3049 beobachtete Reflexe. Bis-bidentate Terephthaloyl-bis(selenoharnstoffe) ergeben unter den gleichen Bedingungen makrocyclische Dreikernnickel(II)-chelate.Beide Komplextypen wurden durch FAB-Massenspektren charakterisiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal and Molecular Structure of a Novel Trimetallamacrocyle: cyclo-Tri[nickel-μ-[1,1,1′,1′-tetraethyl-3,3′-terephthaloyl-bis-thioureato(2-)-S,O:O′,S′]]The structure of the title compound has been determined by an X-ray structure analysis. The compound crystallizes in the triclinic space group P1 with a = 13.900, b = 15.403, c = 16.615 Å, δ = 84.01, β = 70.61, γ = 89.64° and Z = 2. The solution of the structure was performed by direct methods. The final R value was R = 0.073 for 2824 observed reflections. The molecule has a cyclic structure consisting of three molecules of the quadridentate ligand and three nickel atoms. The formed ring is a 27-membered trimetallamacrocycle. The nickel atoms form a nearly equilateral triangle with distances of 10.25 Å, 10.45 Å and 10.45 Å. The molecule is relatively planar.
    Notes: Die Struktur der Titelverbindung wurde durch Röntgenkristallstrukturanalyse bestimmt. Die Verbindung kristallisiert triklin in der Raumgruppe P1 mit den Gitterkonstanten a = 13,900, b = 15,403, c = 16,615 Å, δ = 84,01, β = 70,61, γ = 89,64° und Z = 2. Die Lösung der Struktur erfolgte mit direkten Methoden. Der abschließende R-Wert betrug R = 0,073 für 2284 beobachtete Reflexe. Das Molekül besitzt eine zyklische Struktur, bestehend aus drei Molekülen des quadridentaten Liganden und drei Nickel-Atomen. Der gebildete Ring ist ein 27gliedriger Trimetallamacrocyclus. Die Nickel-Atome bilden ein nahezu gleichseitiges Dreieck mit Abständen von 10,25 Å, 10,45 Å und 10,45 Å. Das Molekül ist relativ planar.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 0044-2313
    Keywords: Copper, nickel complexes of N-acyl-thiourea derivatives ; acid dissociation constants ; complex stability constants ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrophilic Substituted N-Acyl-thioureas  -  Acidity and Stability of Complexes in Dioxane/Water MixturesSome derivatives of N-acyl-thioureas containing hydroxy, ester or sulfonic acid groups as well as their copper(II) and nickel(II) complexes have been synthesized. Acid dissociation constants and complex stability constants have been measured pH-potentiometrically in dioxane/water mixtures ranging from 75 to 0% (v/v) dioxane involving main group and subgroup metal ions as well. The partially remarkable changes of the constants in varied solvent mixtures are discussed.
    Notes: Eine Reihe N-Acyl-thioharnstoffe mit Hydroxy-, Ester- oder Sulfonsäuregruppen und ihre Kupfer(II)- und Nickel(II)-Komplexe wurden erstmals synthetisiert und ihre Säuredissoziationskonstanten pH-potentiometrisch in Dioxan/Wassergemischen (Dioxangehalt 75 - 0 Vol.-%) bestimmt. Die Stabilitätskonstanten der Komplexe mit 1-, 2- und 3-wertigen Metallionen aus Haupt- und Nebengruppen des PSE wurden ebenfalls ermittelt. Die z. T. drastischen Veränderungen der Konstanten bei Variation der Lösungsmittelzusammensetzung werden diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...