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  • 1
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, CXXVII. Kinetische und mechanistische Untersuchungen von Übergangsmetall-Komplex-Reaktionen, XIII. Diethylamino(phenyltelluro)carben- und Diethylaminocarbin-(phenyltelluro)-Komplexe des Chroms: Präparative Untersuchungen und Kinetik der C, Cr-Wanderung von PhTe (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 1009-1016 
    Details
    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, CXXVII. Kinetic and Mechanistic Investigations of Transition Metal Complex Reactions, XI11 2. Diethylamino(phenyltel1uro)carbene- and Diethylaminocarbyne(phenyltelluro) Complexes of Chromium: Preparative Investigations and Kinetics of the C, Cr-Migration of PhTePentacarbonyl(diethylaminocarbyne)chromium tetrafluoroborate, [(CO)5CrCNEt2]BF4 (1), reacts with lithium tellurophenolate, Li[TePh], with addition of the tellurophenolate anion to the carbyne carbon atom to give pentacarbonyl[diethylamino(phenyltelluro)carbene]chromium, (CO)5Cr[C(TePh)NEt2] (2). On heating in solution, the complex 2 rearranges with CO-elimination and C, Cr-migration of TePh to give trans-tetracarbonyl(diethylaminocarbyne)(phenyltelluro)chromium, trans-(PhTe)(CO)4CrCNEt2 (3). The rearrangement follows a first order rate law (-d[2]/dt = k[2]; ΔH≠ = 108 ± 1 kJmol-1; ΔS≠ = 42 ± 4 Jmol-1K-1; in 1,1,2-trichloroethane). In solution, 3 dimerizes with CO-elimination to give bis(μ-phenyltelluro)-bis[tricarbonyl(diethylaminocarbyne)chromium], (μ-PhTe)2[(CO)3CrCNEt2]2 (4). Addition of PPh3 to solutions of 2 does not influence the rate of the rearrangement but leads to a different product, mer-(PhTe)(CO)3(PPh3)CrCNEt2 (5).
    Notes: Pentacarbonyl(diethylaminocarbin)chrom-tetrafluoroborat, [(CO)5CrCNEt2]BF4 (1), reagiert mit Lithium-tellurophenolat, Li[TePh], unter Addition des Tellurophenolat-Anions an das Carbin-kohlenstoffatom und Bildung von Pentacarbonyl[diethylamino(phenyltelluro)carben]chrom, (CO)5Cr[C(TePh)NEt2] (2). Beim Erwärmen in Lösung lagert sich der Komplex 2 unter CO-Abspaltung und C, Cr-Wanderung von TePh nach einem Geschwindigkeitsgesetz erster Ordnung (-d[2]/dt = k[2]; ΔH≠ = 108 ± 1 kJmol-1; ΔS≠ = Jmol-1K-1; in 1,1,2-Trichlorethan) zu trans-Tetracarbonyl(diethylaminocarbin)(phenyltelluro)chrom, trans-(PhTe)(CO)4-CrCNEt2 (3), um. In Lösung dimerisiert 3 unter CO-Eliminierung zu Bis(μ-phenyltelluro)-bis[tricarbonyl(diethylaminocarbin)chrom], (μ-PhTe)2[(CO)3CrCNEt2]2 (4). Zusatz von PPh3 zu Lösungen von 2 beeinflußt zwar die Umlagerungsgeschwindigkeit nicht, liefert jedoch als Reaktionsprodukt mer-(PhTe)(CO)3(PPh3)CrCNEt2 (5).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160318
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  • 2
    Electronic Resource
    Electronic Resource
    P/O Ligand Systems: Facile Synthesis, Structure, and Catalytic Tests of 2′-Phosphanyl-1,1′ -phenyl-2-ols and 2′-Phosphanyl-1,1′-binaphthyl-2-ols (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 1663-1670 
    Details
    ISSN: 0009-2940
    Keywords: Lithiation ; P ligands ; NMR spectroscopy ; Molecular structure ; Hydrogenations ; Hydroformylations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A facile synthesis of 2′-phosphanyl-1,1′-biphenyl- and 2′-phosphanyl-1,1′ -binaphthyl-2-ols and their silyl ethers has been developed, consisting of electron-transfer-catalyzed ring-opening of dibenzofuran and dinaphthofuran, respectively, subsequent reaction with chlorophosphanes, and work-up with acetic acid or ClSiMe3. Studies of the molecular and crystal structures reveals the presence of P - H - O bridging bonds in the more basic tBuPhP derivative and a nearly perpendicular arrangement of the aryl planes in the biphenyl derivatives. The barrier to rotation of the aryl planes about the C-C axis was determined by NMR in the case of the P-asymmetric derivative 3d, using the appearence of diastereoisomers by atropisomerism and P-asymmetry. Comparative screening tests of the title compounds, phosphanyl phenols and phosphanylnaphthols in homogeneous Rh-catalyzed reactions demonstrate catalytic activity in hydroformylation reactions and superior properties of the biphenyl- and binaphthyl-2-ol derivatives in relation to other P-O ligands.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971301118
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  • 3
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, CXXII. Kinetische und mechanistische Untersuchungen von übergangsmetall-Komplex-Reaktionen, XII. Pentacarbonyl[diethylamino(triphenylplumbyl)carben]chrom und trans-Tetracarbonyl(diethylaminocarbin)(triphenyl-plumbyl)chrom: Präparative Untersuchungen und Kinetik der C,Cr-Wanderung von PbPh3 (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 2707-2713 
    Details
    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, CXXII. Kinetic and Mechanistic Investigations of Transition Metal Complex Reaction, XII. Pentacarbonyl[diethylamino(triphenylplumbyl)carbene]chromium and trans-Tetracarbonyl(diethylaminocarbyne)(triphenylplumbyl)chromium: Preparative Investigations and Kinetics of the C,Cr-Migration of PbPh3Pentacarbonyl(diethylaminocarbyne)chromium tetrafluoroborate, [(CO)5CrCNEt2]BF4 (2), reacts with lithium triphenylplumbate, LiPbPh3 (3), with addition of the plumbate anion to the carbyne carbon atom to give pentacarbonyl[diethylamino(triphenylplumbyl)carbene]chromium, (CO)5-Cr[C(PbPh3)NEt2] (4). Already at room temperature, the complex 4 rearranges with CO-elimination and C,Cr-migration of PbPh3 to give trans-tetracarbonyl(diethylaminocarbyne)(triphenylplumbyl)chromium, trans-(Ph3Pb)(CO)4CrNEt2 (5). The rearrangement follows a first-order rate law (ΔH≠ = 103 kJmol-1; ΔS≠ = 40 Jmol-1, K-1, in 1,1,2-trichloroethane). The compounds 4 und 5 were characterized by analytical and spectroscopic means.
    Notes: Pentacarbonyl(diethylaminocarbin)chrom-tetrafluoroborat, [(CO)5CrCNEt2]BF4 (2), reagiert mit Lithium-triphenylplumbat, LiPbPh3 (3), unter Addition des Plumbat-Anions an das Carbinkohlenstoffatom und Bildung von Pentacarbonyl[diethylamino(triphenylplumbyl)carben]chrom, (CO)5Cr[C(PbPh3)NEt2] (4). Bereits bei Raumtemperatur lagert sich der Komplex 4 unter CO-Abspaltung und C,Cr-Wanderung von PbPh3 nach einem Geschwindigkeitsgesetz erster Ordnung (ΔH≠ = 103 kJmol-1, ΔS≠ = 40 Jmol-1, K-1, in 1,1,2-Trichlorethan) zu trans-Tetracarbonyl-(diethylaminocarbin)(triphenylplumbyl)chrom, trans-(Ph3Pb)(CO)4CrCNEt2 (5), um. Die Verbindungen 4 und 5 wurden analytisch und spektroskopisch gesichert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150804
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesen, Strukturen und thermische Abbaureaktionen von TlI-, PbII- und SeII-Komplexen mit 2,2-Dicyanethylen-1,1-diselenolat (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1565-1570 
    Details
    ISSN: 0009-2940
    Keywords: Diselenolates ; Thallium complexes ; Lead complexes ; Selenium complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation, Structures, and Thermal Decomposition Reactions of Complexes Consisting of TlI, PbII, and SeII and 2,2-Dicyanoethylene-1,1-diselenolateThe 2,2-dicyanoethylene-1,1-diselenolate-containing compounds (AsPh4)2[Tl2(Se2C=C(CN)2)2], (AsPh4)2[Pb(Se2C=C-(CN)2)2], and (NBu4)2[Se(Se2C=C(CN)2)2] have been prepared and characterized by single-crystal structure analysis. The molecular structures of the complex anions 1-3 are significantly influenced by the presence of stereochemically active lone pairs. 1 is dimeric with an Se4Tl2 octahedral centre with a Tl-Tl distance of 3.547(4) Å and an average Tl-Se bond length of 3.143(4) Å. In 2 Pb constitutes the centre of a distorted pseudo-trigonal bipyramid PbSe4E [Pb-Seave = 2.948(3) Å] with one equatorial position obviously occupied by the lonepair E. In 3 the ligands are coordinated to the central Se, which is situated in a centre of symmetry, in an undistorted way giving rise to a Ψ-octahedral SeSe4E2 geometry [Se-Seave = 2.617(2) Å]. The compounds (AsPh4)2 · 1, (AsPh4)2 · 2 and (NBu4)2 · 3 have been decomposed thermally to yield TlSe, PbSe as well as Se. The observed contamination of TlSe and PbSe with As is avoided by using (NBu4)2 · 1 and (NBu4)2 · 2 as precursor materials.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250709
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  • 5
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, CXVII1) [(Arylseleno)(diethylamino)carben]pentacarbonylchrom(0)-Komplexe (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3209-3219 
    Details
    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, CXVII1) [(Arylseleno)(diethylamino)carbene]pentacarbonylchromium(0)Pentacarbonyl(diethylaminocarbyne)chromium tetrafluoroborate, [CO)5CrCNEt2]BF4, (1) reacts with lithium arylselenolate, LiSeR, (3) [R = 4-C6H4CF3 (a), 4-C6H4Br (b) 4-C6H4F (c), C6H5 (d), 4-C6H4CH3 (e), 4-C6H4OCH3 (f), 1-C10H7 (g)] with addition of the selenolate anion to the carbyne carbon atom to give [(arylseleno)(diethylamino)carbene]pentacarbonylchromium(0), (CO)5Cr[C(SeR)NEt2], (4a - g). The complexes 4 were characterized by elemental analyses, spectroscopic data and in the case fo 4d additionally by an X-ray analysis. On heating in solution, 4a - g rearrange with CO-elimination and C,Cr-migration of SeR to the corresponding trans-(arylseleno)tetracarbonyl(diethylaminocarbyne)chromium complexes, trans-RSe(CO)4-CrCNEt2, (5a - g).
    Notes: Pentacarbonyl(diethylaminocarbin)chrom-tetrafluoroborat, [(CO)5CrCNEt2]BF4, (1) reagiert mit Lithium -arylselenolat, LiSeR, (3) [R = 4-C6H4CF3 (a), 4-C6H4Br (b) 4-C6H4 (c), C6H5 (d), 4-C6H4CH3 (e), 4-C6H4OCH3 (f), 1-C10H7 (g)] unter Addition des Selenolat-Anions an das Carbinkohlenstoffatom und Bildung von [Arylseleno)(diethylamino)carben]pentacarbonylchrom(0), (CO)5Cr[C(SeR)NEt2], (4a-g). Die Komplexe 4 wurden elementaranalytisch, spektroskopisch sowie im Fall von 4d zusätzlich durch eine Röntgenstrukturanalyse gesichert. Beim Erwärmen in Lösung lagern sich 4a-g unter CO-Abspaltung und C, Cr-Wanderung von SeR zu den entsprechenden trans-(Arylseleno)tetracarbonyl(diethylaminocarbin)chrom-Komplexen, trans-RSe(CO)4(CrCNEt2, (5a-g) um.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141003
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  • 6
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, CXVIII1) Kinetische und mechanistische Untersuchungen von Übergangsmetall-Komplex-Reaktionen, VIII2) C, Cr-Wanderung von SeR in (CO)5Cr[C(SeR)NEt2]: Kinetische, mechanistische und präparative Untersuchungen (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3220-3232 
    Details
    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, CXVIII1) Kinetic and Mechanistic Investigations of Transition Metal Complex Reactions, VIII2) C, Cr-Migration of SeR in (CO)5Cr[C(SeR)NEt2]: Kinetic, Mechanistic and Preparative InvestigationsOn heating in solution, [(arylseleno)(diethylamino)carbene]pentacarbonylchromium complexes, (CO)5Cr[C(SeR)NEt2], (2) [R = 4-C6H4CF3 (a), 4-C6H4Br (b), 4-C6H4F (c), C6H5 (d), 4-C6H4CH3 (e), 4-C6H4OCH3 (f), 1-C10H7 (g)] rearrange with CO-elimination and C, Cr-migration of SeR to form the corresponding trans-(arylseleno)tetracarbonyl(diethylaminocarbyne) chromium complexes, trans-RSe(CO)4CrCNEt2, (3a-g). The rearrangement follows a first-order rate law. Free carbon monoxide does not influence the reaction rate whereas the Polarity of the solvent and the type of the substituent R only influence the rate of the reaction to a very small extent. The activation enthalpies are ΔH≠ = 101-104 kj mol-1, the activation entropies ΔS = 27-33 j mol-1 K-1. Addition of PPh3 to solutions of 2d does not influence the rate of the rearrangement but leads to a different reaction product, mer-(CO)3(PPh)3(SePh)CrCNEt2 (4d). Complex (4d). is also formed by photolysis of 2d in the presence of PPh3, The compounds 3a - d and 4d are characterized by analytical and spectroscopic means, 3c, additionally by an X-ray analysis.
    Notes: Beim Erwärmen in Lösung lagern sich die [(Arylseleno)(diethylamino)carben]pentacarbonyl-chrom-Komplexe, (CO)5Cr[C(SeR)NEt2], (2) [R = 4-C6H4CF3 (a), 4-C6H4Br (b), 4-C6H4 (c_, C6H4 (d), 4-C6H4OCH3 (e) 4-C6H4OCH3 (f), 1-C10H7 (g)] unter CO-Abspaltung und C, Cr-Wanderung von SeR zu den entsprechenden trans-(Arylseleno)tetracarbonyl(diethylaminocarbin)-chrom-Komplexen, trans-RSe(CO)4CrCNEt2, (3a-g) nach einem Geschwindigkeitsgesetz erster Ordnung um. Freies Kohlenmonoxid ist ohne, die Polarität des Solvens sowie die Art des Substituenten R sind nur von geringem Einfluß auf die Reaktionsgeschwindigkeit. Die Aktivierungsenthalpien betragen ΔH≠ = 101 104 kj mol-1, die Aktivierungsentropien ΔS≠ = 27-33 j mol-1 K-1. Zusatz von PPh3 zu Lösungen von 2d beeinflußt zwar die Umlagerungsgeschwindigkeit nicht, man erhält jedoch mer-(CO)3(PPh)3(SePh)CrCNEt2 (4d) als Reaktionsprodukt. Photolyse von 2d in THF in Anwesenheit von PPh3 liefert ebenfalls 4d. Die Verbindungen 3a-d und 4d wurden analytisch und spektroskopisch gesichert, 3c zusätzlich durch eine Röntgenstrukturanalyse.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811141004
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  • 7
    Electronic Resource
    Electronic Resource
    Rubber toughening of polystyrene-acrylonitrile copolymers (1997)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 48 (1997), S. 553-561 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The efficiency of rubber toughening of PSAN depends on the size of the rubber particles, their agglomeration, the deformation rate, the temperature, and the orientation of the polymer molecules. Large particles are more effective than small particles. By a suitable choice of processing, however, small particles can agglomerate, forming large soft units and improving in this way impact toughness. At high deformation rates crazing or/and stretching of the matrix wall between the rubber particles must be activated for ductility, otherwise the material is brittle. The temperature at impact must be above the glass transition temperature of the rubbery phase for toughening. Increasing the orientation of the material decreases the tendency for craze formation with the consequence of embrittlement, if stretching is not activated.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1997.010481205
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  • 8
    Electronic Resource
    Electronic Resource
    Struktur und thermisches Verhalten von Gadolinium(III)-sulfat-Octahydrat Gd2(SO4)3 · 8 H2O (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 805-810 
    Details
    ISSN: 0044-2313
    Keywords: Gadolinium compounds ; preparation ; crystal structures ; DTA-TG analysis ; X-ray powder pattern ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure and Thermal Behaviour of Gadolinium(III)-sulfate-octahydrate Gd2(SO4)3 · 8 H2O.Gd2(SO4)3 · 8 H2O crystallizes monoclinic with space group C2/c and the lattice constants a = 13.531(7), b = 6.739(2), c = 18.294(7) Å, β = 102.20(8)°. In the structure Gd is coordinated by 4 oxygen atoms of crystal water and 4 oxygens of sulfate giving rise to a distorted square antiprism. During DTA-TG-experiments the title compound first loses crystal water in a two-step mechanism in the temperature range 130-306°C. The resulting Gd2(SO4)3 is amorphous and recrystallization occurs in the range 380-411°C. The so-obtained low-temperature modification β-Gd2(SO4)3, undergoes a monotropic phase transition at about 750°C to the high-temperature form α-Gd2(SO4)3. The powder pattern of this modification was indexed based on monoclinic symmetry with space group C2/c and lattice constants a = 9.097(3), b = 14.345(5), c = 6.234(2) Å, β = 97.75(8)°. The hightemperature modification of gadolinium-sulfate shows decomposition to Gd2O2SO4 at 900°C and, subsequently, decomposition at 1 200°C yields the formation of C-Gd2O3.
    Notes: Gd2(SO4)3 · 8 H2O kristallisiert monoklin in der Raumgruppe C2/c mit den Gitterkonstanten a = 13,531(7), b = 6,739(2), c = 18,294(7) Å und β = 102,20(8)°. In der Struktur ist Gd von je 4 Sauerstoffatomen des Hydratwassers und der Sulfationen in Form eines stark verzerrten quadratischen Antiprismas umgeben. Im DTA-TG-Experiment verliert Gd2(SO4)3 · 8 H2O in einem zweistufigen Prozeß im Temperaturbereich 130-306°C zunächst Kristallwasser; anschließend tritt zwischen 380 und 411°C Rekristallisation des amorphen Gd2(SO4)3 unter Bildung der Tieftemperaturmodifikation β-Gd2(SO4)3 auf. Bei ca. 750°C wird monotrop die Hochtemperaturmodifikation α-Gd2(SO4)3 gebildet. Aus der Analyse der Pulverdaten folgt monokline Symmetrie mit der Raumgruppe C2/c und den Gitterkonstanten a = 9,097(3), b = 14,345(5), c = 6,234(2) Å und β = 97,75(8)°. Ab ca. 900°C beginnt die Zersetzung von α-Gd2(SO4)3 zu Gd2O2SO4 und ab 1 200°C liegt C-Gd2O3 vor.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190429
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  • 9
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    Impairment of mycobacterial immunity in human interleukin-12 receptor deficiency (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-06-20
    Description: In humans, interferon gamma (IFN-gamma) receptor deficiency leads to a predisposition to mycobacterial infections and impairs the formation of mature granulomas. Interleukin-12 (IL-12) receptor deficiency was found in otherwise healthy individuals with mycobacterial infections. Mature granulomas were seen, surrounded by T cells and centered with epithelioid and multinucleated giant cells, yet reduced IFN-gamma concentrations were found to be secreted by activated natural killer and T cells. Thus, IL-12-dependent IFN-gamma secretion in humans seems essential in the control of mycobacterial infections, despite the formation of mature granulomas due to IL-12-independent IFN-gamma secretion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Altare, F -- Durandy, A -- Lammas, D -- Emile, J F -- Lamhamedi, S -- Le Deist, F -- Drysdale, P -- Jouanguy, E -- Doffinger, R -- Bernaudin, F -- Jeppsson, O -- Gollob, J A -- Meinl, E -- Segal, A W -- Fischer, A -- Kumararatne, D -- Casanova, J L -- New York, N.Y. -- Science. 1998 May 29;280(5368):1432-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉INSERM U429, Hopital Necker-Enfants Malades, Paris 75015, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9603732" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cytotoxicity, Immunologic ; Female ; Granuloma/immunology ; Humans ; Hypersensitivity, Delayed ; Interferon-gamma/biosynthesis/immunology/secretion ; Interleukin-12/*immunology ; Killer Cells, Natural/immunology ; Lymphocyte Activation ; Male ; Mice ; Mice, Knockout ; Mutation ; Mycobacterium avium-intracellulare Infection/*immunology ; *Mycobacterium bovis ; Pedigree ; Receptors, Interferon/genetics/immunology ; Receptors, Interleukin/deficiency/*genetics ; Receptors, Interleukin-12 ; T-Lymphocytes/immunology ; Tuberculosis/*immunology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    Localization of a short-term memory in Drosophila (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-04-28
    Description: Memories are thought to be due to lasting synaptic modifications in the brain. The search for memory traces has relied predominantly on determining regions that are necessary for the process. However, a more informative approach is to define the smallest sufficient set of brain structures. The rutabaga adenylyl cyclase, an enzyme that is ubiquitously expressed in the Drosophila brain and that mediates synaptic plasticity, is needed exclusively in the Kenyon cells of the mushroom bodies for a component of olfactory short-term memory. This demonstrates that synaptic plasticity in a small brain region can be sufficient for memory formation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zars, T -- Fischer, M -- Schulz, R -- Heisenberg, M -- New York, N.Y. -- Science. 2000 Apr 28;288(5466):672-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Theodor Boveri Institut fur Biowissenschaften, Lehrstuhl fur Genetik, (Biozentrum) Am Hubland, D97074, Wurzburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10784450" target="_blank"〉PubMed〈/a〉
    Keywords: Adenylyl Cyclases/genetics/*metabolism ; Animals ; Avoidance Learning ; Brain/enzymology/physiology ; Brain Mapping ; DNA-Binding Proteins ; Drosophila/enzymology/genetics/*physiology ; Electroshock ; Enhancer Elements, Genetic ; Fungal Proteins/genetics ; *Memory, Short-Term ; Mutation ; *Neuronal Plasticity ; Neurons/enzymology/*physiology ; Olfactory Pathways ; *Saccharomyces cerevisiae Proteins ; Smell ; Synapses/*physiology ; Transcription Factors/genetics ; Transgenes
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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