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  • Wiley-Blackwell  (69)
  • Springer  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 385 (1979), S. 93-101 
    ISSN: 1432-2307
    Keywords: Angioma ; Lung ; Carcinoma ; Pneumocytes ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Elektronenmikroskopische Untersuchung eines sog. sklerosierenden Hämangioms der Lunge, das im Oberlappen einer 32jährigen Frau zufällig entdeckt wurde. Der seltene gutartige Tumor, der lichtmikroskopisch wegen seines Gefäßreichtums an ein Hämangiom erinnert, zeigt elektronenmikroskopisch eine eindeutige epitheliale Struktur. Die Geschwulst entwickelt sich möglicherweise aus unreifen Pneumocyten. Histogenese sowie differential-diagnostische Probleme (Verwechslungsmöglichkeit mit Carcinom) werden diskutiert.
    Notes: Summary Electron microscopy of a sclerosing angioma of the lung, a coincidental finding in the upper lobe of a 32-year-old woman. The rare, benign tumor, whose vascular proliferation by light microscopy is reminiscent of an angioma, exhibits a clear epithelial structure by electron microscopy. The tumor may develop out of immature pneumocytes. The paper discusses histogenesis and problems of differential diagnosis (potential confusion with carcinomas).
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 32 (1975), S. 353-357 
    ISSN: 1432-0533
    Keywords: Peripheral nervous system culture ; Radioactive labelled chloroquine ; Multilamellated bodies ; Electron microscope autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cultured spinal ganglia of the rat treated with 3-3H-chloroquine led to the formation of numerous multilamellated bodies (MLB) in the perikarya of neurons, satellite cells, and fibroblasts. Electron microscope autoradiography showed label over and near a considerable proportion of MLB. The action of chloroquine in MLB is discussed with regard to its effect upon lysosomes.
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  • 3
    ISSN: 1432-1327
    Keywords: Key words Metalloprotein ; Type 3 copper center ; Tyrosinase ; Hemocyanin ; Oxygen binding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract  We purified two catechol oxidases from Lycopus europaeus and Populus nigra which only catalyze the oxidation of catechols to quinones without hydroxylating tyrosine. The molecular mass of the Lycopus enzyme was determined to 39 800 Da and the mass of the Populus enzyme was determined to 56 050 Da. Both catechol oxidases are inhibited by thiourea, N-phenylthiourea, dithiocarbamate, and cyanide, but show different pH behavior using catechol as substrate. Atomic absorption spectroscopic analysis found 1.5 copper atoms per protein molecule. Using EPR spectroscopy we determined 1.8 Cu per molecule catechol oxidase. Furthermore, EPR spectroscopy demonstrated that catechol oxidase is a copper enzyme of type 3. The lack of an EPR signal is due to strong antiferromagnetic coupling that requires a bridging ligand between the two copper ions in the met preparation. Addition of H2O2 to both enzymes leads to oxy catechol oxidase. In the UV/Vis spectrum two new absorption bands occur at 345 nm and 580 nm. In accordance with the oxy forms of hemocyanin and tyrosinase the absorption band at 345 nm is due to an O2 2– (πσ*)→Cu(II) (d x2–y2 ) charge transfer (CT) transition. The absorption band at 580 nm corresponds to the second O2 2– (πv*)→Cu(II) (d x2–y2 ) CT transition. The UV/Vis bands in combination with the resonance Raman spectra of oxy catechol oxidase indicate a μ-η2 : η2 binding mode for dioxygen. The intense resonance Raman peak at 277 cm–1, belonging to a Cu-N (axial His) stretching mode, suggests that catechol oxidase has six terminal His ligands, as known for molluscan and arthropodan hemocyanin.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 128 (1972), S. 393-405 
    ISSN: 1432-0878
    Keywords: Peripheral nerve ; Polyamines ; Autoradiography ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Mit Hilfe der Autoradiographie von Semi- und Ultradünnschnitten wurde die Verteilung der Radioaktivität nach Applikation von 3H-Putrescin im intakten und im degenerierenden N. ischiadicus der Ratte sowie in Spinalganglien untersucht. Im intakten und im geschädigten Nerven war die Radioaktivität, die zum weit überwiegenden Anteil als Spermidin und Putrescin vorkam, in allen zellulären Bestandteilen des Nerven, im Cytoplasma, in den Kernen und sehr deutlich auch in den Markscheiden, lokalisiert. Im extrazellulären Raum und über den Kollagenfibrillen war demgegenüber nur eine sehr geringe Radioaktivität festzustellen. Die physiologische Funktion von Spermidin und Putrescin im Myelin und den anderen Zellbestandteilen wird in erster Linie im Zusammenhang mit der in diesen Strukturen ebenfalls lokalisierten RNA diskutiert, da zahlreiche Hinweise für eine Rolle der Polyamine in der RNA- und Proteinsynthese vorliegen.
    Notes: Summary The distribution of radioactivity from 3H-putrescine was studied in intact and degenerated sciatic nerves, and spinal ganglia of rats by means of high resolution autoradiography. During the first three days after the administration of the labeled putrescine, the main proportion of radioactive material in the nerves was represented by spermidine and putrescine. Both, in intact and degenerating nerves, developed silver grains were deposited in all cellular components of the nervous tissue, the myelin sheath being markedly tagged. Perineural tissue was also labeled considerably, however, there was no significant amount of label in the extracellular space and in the collagen fibrils. The possible physiological significance of putrescine and spermidine in myelin and in other cellular components of nerves is discussed.
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  • 5
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, LIV. Synthesis of Transition Metal Carbonyl Ylide Complexes from Transition Metal Carbonyl Carbene ComplexesSecondary und tertiary alkylphosphines PX3 [X3 = (CH3)3, (C2H5)3, (n-C4H9)3, (CH3)2H] react with (alkoxycarbene)- or (alkylthiocarbene)pentacarbonyl complexes of chromium(0) and tungsten(0),(CO)5Cr[C(OCH3)C6H5], (CO)5W[C(OCH3)CH3] and (CO)5W[C(SCH3)CH3], at low temperatures to give the corresponding ylidepentacarbonylmetal complexes (CO)5M[C(PX3)(YCH3)(Z)] (M = Cr, W; Y = O, S; Z = CH3, C6H5) under addition of the phosphines to the carbene carbon atom. The structures of the pale yellow, diamagnetic, and partially very thermolabile compounds were established by analysis, i.r., n.m.r., and mass spectra. The partial thermal conversion of (CO)5Cr[C(P(CH3)2H)(OCH3)(C6H5)] in acetone was shown to yield (CO)5Cr{P(CH3)2[CH(OCH3)(C6H5)]}.
    Notes: Durch Umsetzung sekundärer und tertiärer Alkylphosphine PX3 [X3 = (CH3)3, (C2H5)3, (n-C4H9)3, (CH3)2H] mit den (Alkoxycarben)- bzw. (Alkylthiocarben)pentacarbonyl-Komplexen von Chrom(0) und Wolfram(0), (CO)5Cr[C(OCH3)C6H5], (CO)5W[C(OCH3)CH3] und (CO)5W[C(SCH3)CH3], bei tiefen Temperaturen wurden unter Addition der Phosphine an das Carbenkohlenstoffatom entsprechende Ylid-pentacarbonylmetall-Komplexe (CO)5 M[C(PX3) (YCH3)(Z)] (M = Cr, W; Y = O, S; Z = CH3, C6H5) erhalten. Die Strukturen der schwach gelblichen, diamagnetischen, z T. sehr thermolabilen Verbindungen wurden durch Analyse, IR-, NMR- und Massenspektren gesichert. Die partielle thermische Reaktion von (CO)5Cr[C(P(CH3)2H)(OCH3)(C6H5)] in Aceton zu (CO)5Cr{P(CH3)2[CH(OCH3)(C6H5)]} wurde nachgewiesen.
    Additional Material: 3 Ill.
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  • 6
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, LXIX. Isomerism of cis- and trans-(Alkoxycarbene)tetracarbonyl(phosphine)metal Complexes and Dependence of the Equilibrium ConstantsSolutions of cis- and trans-(alkoxycarbene)tetracarbonyl(phosphine)metal complexes, (CO)4M(PR3)[COR′)R″] [M=Cr, W; R3=(CH3)3, (C2H5)3, (n-C4H9)3, (n-C8H17)3, (i-C2H7)3, (C6H11)3, (C2H5)2C6H5, (C6H5)2C2H5, (C6H5)3, (p-C6H4CH3)3, (p-C6H4F)3, (m-C6H4F)3; R′=CH3, C2H5; R″=CH3, C2H5, i-C3H7, C6H7, C6H5] on heating isomerize to an equilibrium situation. The equilibrium constants are dependent upon the solvent, the central metal, the phosphine group and the carbene ligand.
    Notes: cis-u. trans-(Alkoxycarben)tetracarbonyl(phosphin)metall-Komplexe, (CO)4M(PR3)[(OR′)R′] [M=Cr, W; R3=(CH3)3, (C2H5)3, (n-C4H9)3, (n-C8H11)3, (C3H5)3, (C 6H11)3, (C2H5)2C6H5, (C2H5)2C2H5, (C6H5)3, (p-C6H4CH3)3, (p-C6H4F)3, (m-C 6H4F)3; R′=CH3, C2H5; R′=CH3, C2H5, i-C3H7, C6H5] isoerisieren beim Erwärmen in Lösung bis zu einem Gleichgewichtszustand. Die lage dieses Isomerisierungsgleichgewichts ist durch die Wahl des Lösungsmittels. des Zentralmetalls der Phosphingruppe und des Carbenliganden beeinflußbar.
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  • 7
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbyne Complexes, XVII. Ring-substituted trans-Bromotetracarbonyl(phenylcarbyne) Complexes of Chromium and TungstenThe preparation and spectroscopic properties of a series of ring-substituted trans-bromotetra-carbonyl(phenylcarbyne) complexes Br(CO)4MCR [M = Cr, W; R = C6H4N(CH3)2-(p), C6H4CH3-(p), C6H4OCH3-(p), C6H2(CH3)3-(2,4,6), C6H4CF3-(p), C6H4C6H5-(o), C6H3Cl2-(2,6), C6Cl5] are described. The influence of the substituents on the vCO absorptions and on the 13C n. m. r. signals is discussed. The X-ray structure analysis of trans-Br(CO)4CrCC6H4CF3-(p) reveals the extremely short Cr—Ccarbyne bond length of 168 ± 2 pm.
    Notes: Die Darstellung und die spektroskopischen Eigenschaften einer Reihe von ringsubstituierten trans-Bromotetracarbonyl(phenylcarbin)-Komplexen Br(CO)4MCR [M = Cr, W; R = C6H4N(CH3)2-(p), C6H4CH3-(p), C6H4OCH3-(p), C6H2(CH3)3-(2,4,6), C6H4CF3-(p), C6H4C6H5-(o), C6H3Cl2-(2,6), C6Cl5] werden beschrieben und der Einfluß der Substituenten auf die vCO-Absorptionen und die 13C-NMR-Signale diskutiert. Die Röntgenstrukturanalyse von trans-Br(CO)4CrCC6H4CF3-(p) ergibt für die Cr—CCarbin-Bindung den extrem kurzen Abstand von 168 ± 2 pm.
    Additional Material: 5 Tab.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 2459-2467 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, LXXIV. Reversible Addition of Tertiary Phosphines on Pentacarbonyl(methoxymethylcarbene) Metal ComplexesThe reaction of tertiary phosphines PR3 [PR3 = P(C4H9)3, P(C2H5)2C6H5, P(i-C3H7)3] with pentacarbonyl(methoxymethylcarbene)metal complexes of chromium(O) and tungsten(O), (CO)5Cr[C(OCH3)] and (CO)5W[C(OCH3)], at low temperatures results in a reversible addition of the phosphine to the carbene ligand. The addition-dissociation-equilibrium constants depend on the temperature, the solvent, the phosphine, and the central metal.
    Notes: Bei der Umsetzung von tertiären phosphinen PR3 [PR3 = P(C4H9)3. P(C2H5)2 C6H5. P(i-C3H7)3] mit Pentacarbonyl(methoxymethylcarben)chrom(O) bzw. -wolfram(O). (CO)5Cr[C(OCH3)CH3] bzw. (CO)5W[C(OCH3)CH3], bei tiefen Temperaturen erfolgt eine Gleichgewichtskonstanten hängen von der Temperatur, dem Lösungsmittel, der Art des Phosphins und des Zentralmetalls ab.
    Additional Material: 5 Tab.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 2080-2093 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metallaheterocumulenes, IV. 2-Azaallylidene Complexes  -  Novel Compounds with a Bent CNCR2 Fragment as Complex Ligand(2-Azoniaallenylidene)pentacarbonyltungsten tetrabromoaluminate complexes [(CO)5W(CNCR2)]+AlBr4- (2-AlBr4) (CR2=C(C6H4Br-4)2 (a), CPh2 (b), C(C6H4OMe-4)2 (c), C(C6H4)2O (d), C(2,4,6-C6H2Me3)2 (e)) Which are synthesized by the reaction of (CO)5W[C(OEt)N=CR2] (1) with AlBr3, react with freshly distilled tetrahydrofuran to give neural trans-bromo(2-azaallylidene) complexes trans-Br(CO)4W(CNCR2) (3) and small amounts of (CO)5W—C≡N—[CR2]2—N≡C—W(CO)5 (4). The compounds 4 correspond to the product of a reductive dimerization of two cations 2. If 1b (or the corresponding methoxy compound 5) reacts with BBr3 instead of AlBr3/THF 4b is the main product. The spectroscopic data of 3 and the results of an X-ray analysis of 3b show that the replacement of a CO ligand in the cations 2 by Br- with formation of 3 results in a drastic change of the bonding situation within the CNCR2 ligand. 3a-e are the first compounds in which a strongly bent CNCR2 fragment functions as a complex ligand. The aminocarbyne complex trans-Br(CO)4W≡CNPh2 (7) was synthesized by BBr3-induced fragmentation of (CO)5W[C(NPh2)N=C(Ph)OMe] (6).
    Notes: (2-Azoniaallenyliden)pentacarbonylwolfram-tetrabromoaluminat-Komplexe [(CO)5W(CNCR2)]+AlBr4- (2-AlBr4) (CR2=C(C6H4Br-4)2 (a), CPh2 (b), C(C6H4OMe-4)2 (c), C(C6H4)2O (d), C(2,4,6-C6H2Me3)2 (e))  -  darstellbar durch Umsetzung von (CO)5W[C(OEt)N=CR2] (1) mit Albr3  -  reagieren mit frisch destillierten Tetrahydrofuran zu neutralen trans-Bromo(2-azaallyliden)-Komplexen trans-Br(CO)4W(CNCR2) (3) und wenig (CO)5W—C≡N—[CR2]2—N≡C—W(CO)5 (4). Die Verbindungen 4. entsprechen dem Produkt einer reduktiven Dimerisierung zweier Kationen 2. 4b wird zum Hauptprodukt der Umsetzung, wenn 1b (oder der entsprechende Methoxy-Komplex 5) mit BBr3 anstatt AlBr3/THF umgesetzt wird. Wie die spektroskopischen Daten von 3 sowie die Ergebnisse der an 3b durchgeführten Röntgenstrukturanalyse zeigen, führt der Austausch eines CO-Liganden in den Kationen 2 gegen Br- unter Bildung von 3 zu einer drastischen Veränderung der Bindungsverhältnisse im CNCR2-Liganden. 3a-e sind die ersten Verbindungen, in denen ein stark gewinkeltes CNCR2-Fragment als Komplexligand fungiert. Durch BBr3-induzierte Fragmentierung von (CO)5W[C(NPh2)N=C(Ph)OMe] (6) wurde der Aminocarbin-Komplex trans-Br(CO)4W≡CNPh2 (7) dargestellt.
    Additional Material: 1 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 811-814 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The cationic [3,3-bis(tert-butyl)-2-azoniaallenylidene]pentacarbonyl complexes [(CO)5M(CNC(tBu)2)]⊖ AlBr4⊕ (2) [M=Cr (a), W (b)] which are synthesized by the reaction of (CO)5M-[C(OEt)N=C(tBu)2] (1) with AlBr3, react with tetrahydrofuran via addition of Br⊖ to give the isocyanide complexes (CO)5M-C≡N-C(tBu)2Br (3). Under nitrogen at room temperature, 3b decomposes in solution within ca. two hours to give the binuclear diisocyanide complex [(CO)5W-C≡N]2C(tBu)2 (4b). When the same conditions are applied to solutions of 3b in the presence of oxygen or of galvinoxyl 3b is stable. The structure of 4b was confirmed by an X-ray analysis.
    Notes: Die kationischen [3,3-Bis(tert-butyl)-2-azoniaallenyliden]pentacarbonyl-Komplexe [(CO)5M(CNC(tBu)2)⊖ (2) [M=Cr (a), W (b)] - darstellbar durch Umsetzung von (CO)5M[C(OEt)- N=C(tBu)2] (1) mit AlBr3 - reagieren mit Tetrahydrofuran unter Addition von Br⊕ zu den Isocyanid-Komplexen (CO)5M - C≡N-C(tBu)2Br (3). Bei Raumtemperatur zersetzt sich 3b unter Stickstoff in Lösung innerhalb von ca. zwei Stunden zu dem zweikernigen Diisocyanid-Komplex [(CO)5W-C≡N]2C(tBu)2 (4b), in Gegenwart von Sauerstoff oder von Galvinoxyl ist 3b unter ansonsten gleichen Bedingungen stabil. Die Struktur von 4b wurde durch eine Röntgenstrukturanalyse gesichert.
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