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  • 1
    Online Resource
    Online Resource
    Involvement of the guanine nucleotide exchange factor Vav3 in central nervous system development and plasticity
    Walter de Gruyter GmbH ; 2017
    In:  Biological Chemistry Vol. 398, No. 5-6 ( 2017-5-1), p. 663-675
    Details
    In: Biological Chemistry, Walter de Gruyter GmbH, Vol. 398, No. 5-6 ( 2017-5-1), p. 663-675
    Abstract: Small GTP-hydrolyzing enzymes (GTPases) of the RhoA family play manifold roles in cell biology and are regulated by upstream guanine nucleotide exchange factors (GEFs). Herein, we focus on the GEFs of the Vav subfamily. Vav1 was originally described as a proto-oncogene of the hematopoietic lineage. The GEFs Vav2 and Vav3 are more broadly expressed in various tissues. In particular, the GEF Vav3 may play important roles in the developing nervous system during the differentiation of neural stem cells into the major lineages, namely neurons, oligodendrocytes and astrocytes. We discuss its putative regulatory roles for progenitor differentiation in the developing retina, polarization of neurons and formation of synapses, migration of oligodendrocyte progenitors and establishment of myelin sheaths. We propose that Vav3 mediates the response of various neural cell types to environmental cues.
    Type of Medium: Online Resource
    ISSN: 1437-4315 , 1431-6730
    URL: Article
    DOI: 10.1515/hsz-2016-0275
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2017
    detail.hit.zdb_id: 1466062-3
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    RE 2+x I 2 M 2+y (RE = Ce,Gd, Y; M = Al, Ga): Reduced Rare Earth Halides with a Hexagonal Metal Atom Network
    Walter de Gruyter GmbH ; 2007
    In:  Zeitschrift für Naturforschung B Vol. 62, No. 5 ( 2007-5-1), p. 633-641
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 62, No. 5 ( 2007-5-1), p. 633-641
    Abstract: The title compounds were synthesized from RE, REI 3 (RE = Ce, Gd, Y) and Al or Ga under an Ar atmosphere at 930 - 950 °C. The non-stoichiometric Ce 2+x I 2 Al 2+y and Ce 2 + x I 2 Ga 2+y compounds crystallize in the space group R3̄m (No. 166) with lattice constants a = 4.3645(3), c = 35.914(2) Å for the Al and a = 4.3009(2), c = 35.680(4) Å for the Ga compound. Excess electron density found in the Wyckoff position 3a could be due to a fractional occupation by Ce or M (x = 0.06, y = 0 or x = 0, y = 0.11 in the case of the Ga compound). The stoichiometric Gd 2 I 2 Ga 2 and Y 2 I 2 Ga 2 compounds crystallize in the space group P3̄m1 (No. 164) with lattice constants a = 4.1964(1) and 4.1786(7) Å , c = 11.4753(4) and 11.434(2) Å , respectively. Their structures feature M-centered (M = Al, Ga) RE trigonal prisms condensed via common rectangular faces. The electronic origin of the surplus of metal atoms in the octahedral voids between the I-layers of the Ce compounds was explored via extended Hückel-type calculations. Magnetic susceptibility, electrical resistivity and heat capacity measurements have also been carried out. These reveal a metal-insulator transition of Gd 2 I 2 Ga 2 at 40 K.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2007-0502
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2007
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 3
    Online Resource
    Online Resource
    Ho 4 C 7 , Y 4 C 7 : Carbide mit C 3 4- - und C 4- -Ionen / Ho 4 C 7 , Y 4 C 7 : Carbides with C 3 4- and C 4- Ions
    Walter de Gruyter GmbH ; 1994
    In:  Zeitschrift für Naturforschung B Vol. 49, No. 10 ( 1994-10-1), p. 1439-1443
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 49, No. 10 ( 1994-10-1), p. 1439-1443
    Abstract: The new compounds Ho 4 C 7 and Y 4 C 7 have been prepared by reaction of stoichiometric amounts of the metals and C in closed Ta capsules at 1450 and 1300 K. respectively. With HoF 3 as a flux, black, needle like single crystals of Ho 4 C 7 were obtained, which are air and moisture sensitive. Ho 4 C 7 crystallizes in the space group P2 1 /n (No. 14) with lattice constants a = 368.06(3), b = 1251.8(1). c = 1364.4(2) pm and β = 96.62(1)°. Y 4 C 7 with a = 370.08(5), b = 1258.9(1), c = 1371.8(1) and β = 96.61(1)°. Two different kinds of carbon species occur in the two structures: isolated C 4- ions and C 3 4- units, respectively. The C 4- ions are octahedrally surrounded by Ho-atoms. The Ho 6 C octahedra are condensed to form double chains parallel [100]. The chains are linked via C 3 4- ions, which occupy positions above the edges of the Ho octahedra. Additional Ho atoms are located in voids between the C 3 4- units. The compounds are electrically semiconducting. Ho 4 C 7 has a magnetic Curie-Weiss behaviour with θ= -28(4) K and µ eff = 8.8(2) µB.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-1994-1022
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 1994
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 4
    Online Resource
    Online Resource
    Magnetisch-induktive Durchflussmessung mittels remanentem Magnetismus
    Walter de Gruyter GmbH ; 2020
    In:  tm - Technisches Messen Vol. 87, No. 1 ( 2020-01-28), p. 32-44
    Details
    In: tm - Technisches Messen, Walter de Gruyter GmbH, Vol. 87, No. 1 ( 2020-01-28), p. 32-44
    Abstract: Magnetisch-induktive Durchflusssensoren zeichnen sich durch lange Wartungsintervalle aus, sind jedoch auf die Zuführung elektrischer Leistung zur Erzeugung des für die Messung benötigten magnetischen Wechselfelds angewiesen. In jüngster Zeit gibt es Bestrebungen Sensoren kabellos zu betreiben. Die Minimierung des Leistungsbedarfs des Sensors gewinnt so zunehmend an Bedeutung, um eine lange Betriebszeit des Messwertgebers sicherzustellen. In diesem Beitrag wird deshalb ein magnetisch remanentes Material hinsichtlich seines Energieeinsparpotentials für die magnetisch-induktive Durchflussmessung untersucht. Im Gegensatz zur üblichen Felderzeugung mittels Elektromagneten wird nur während der kurzen Umpolzeiträume elektrische Leistung benötigt. Danach bleibt das Magnetfeld auch ohne weitere Zuführung elektrischer Leistung konstant und kann zur Durchflussmessung herangezogen werden. Anders als beispielsweise Ferritmagnete lassen sich remanente Magnetmaterialien jedoch unter geringerem Energieaufwand umpolen, was sie für die Erzeugung magnetischer Wechselfelder prädestiniert. Wie ein Sensor auf Basis remanenter Materialien dimensioniert werden sollte, damit ein für die Messung ausreichendes Magnetfeld unter minimalen Verlusten erzeugt wird, ist eine der Kernfragen dieses Beitrags. Dazu wird ein Prototyp mithilfe eines Modells ausgelegt und messtechnisch untersucht. Die Ansteuerung des Sensors erfolgt über eine eigens entwickelte Logikschaltung. Es konnte gezeigt werden, dass die Messgenauigkeit unabhängig von der Art der Felderzeugung erhalten bleibt. Für niedrige Feldwechselraten kann der geringe Leistungsbedarf remanenter Magnetmaterialien bestätigt werden.
    Type of Medium: Online Resource
    ISSN: 2196-7113 , 0171-8096
    URL: Article
    DOI: 10.1515/teme-2019-0017
    RVK:
    ZG 1100
    RVK:
    ZS 0001
    Language: Unknown
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2020
    detail.hit.zdb_id: 2025790-9
    SSG: 15,3
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  • 5
    Online Resource
    Online Resource
    La 3 Cl 3 BC – Structure, Bonding and Electrical Conductivity
    Walter de Gruyter GmbH ; 2005
    In:  Zeitschrift für Naturforschung B Vol. 60, No. 5 ( 2005-5-1), p. 499-504
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 60, No. 5 ( 2005-5-1), p. 499-504
    Abstract: A new rare earth carbide boride halide, La 3 Cl 3 BC, has been prepared by heating a mixture of stoichiometric quantities of LaCl 3 , La, B and C at 1050 °C for 10 days. La 3 Cl 3 BC (La 3 Br 3 BC type) crystallizes in the monoclinic system with space group P2 1 /m (No. 11), a = 8.2040(16), b = 3.8824(8), c=11.328(2)Å , β =100.82(3)°. In the structure, monocapped trigonal prisms containing B-C units are condensed into chains along the b direction, and the chains are further linked by Cl atoms in the a and c directions. The condensation results in a polymeric anion 1 ∞ [BC] with a spine of B atoms in a trigonal prismatic coordination by La, and the C atoms attached in a square pyramidal coordination. The B-B and B-C distances are 2.16 and 1.63 Å , respectively. La 3 Cl 3 BC is metallic. The EH calculation shows that the distribution of valence electrons can be formulated as (La 3+ ) 3 (Cl − ) 3 (BC) 5− · e − .
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2005-0504
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2005
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 6
    Online Resource
    Online Resource
    Synthesis, structure, and magnetic properties of the quaternary oxysulfides Ln 5 V 3 O 7 S 6 ( Ln  = La, Ce)
    Walter de Gruyter GmbH ; 2021
    In:  Zeitschrift für Naturforschung B Vol. 76, No. 10-12 ( 2021-11-25), p. 677-688
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 76, No. 10-12 ( 2021-11-25), p. 677-688
    Abstract: Two rare earth oxysulfides Ln 5 V 3 O 7 S 6 ( Ln  = La, Ce) have been synthesized and their structures determined. The two isostructural compounds crystallize in the orthorhombic space group Pmmn (no. 59). The structure features one-dimensional edge-sharing VS 4 O 2 octahedron chains parallel to the b axis. The bonding between V and S/O is covalent, and between Ln 3+ and the rest of the matrix ionic. Magnetic susceptibility measurement revealed that V is in a mixed valence state of V 3+ and V 4+ . Its magnetic behavior follows the Curie-Weiss law.
    Type of Medium: Online Resource
    ISSN: 0932-0776 , 1865-7117
    URL: Article
    DOI: 10.1515/znb-2021-0107
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2021
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 7
    Online Resource
    Online Resource
    Pr 2 CBr: Ein Ferromagnet mit Pr 2 C-Schichten/ Pr 2 CBr: A Ferromagnet with Pr 2 C Layers
    Walter de Gruyter GmbH ; 2009
    In:  Zeitschrift für Naturforschung B Vol. 64, No. 4 ( 2009-4-1), p. 371-374
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 64, No. 4 ( 2009-4-1), p. 371-374
    Abstract: Pr 2 CBr: Ein Ferromagnet mit Pr 2 C-Schichten/ Pr 2 CBr: A Ferromagnet with Pr 2 C Layers
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2009-0402
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2009
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 8
    Online Resource
    Online Resource
    Y 7 I 12 C 2 N: Eine Verbindung aus Einheiten zweier Y 6 (C 2 )-Oktaeder und eines Y 6 N 2 -Tetraederdoppels / Y 7 I 12 C 2 N: A Compound with Units of Two Y 6 (C 2 ) Octahedra and a Y 6 N 2 Double Tetrahedron
    Walter de Gruyter GmbH ; 1995
    In:  Zeitschrift für Naturforschung B Vol. 50, No. 6 ( 1995-6-1), p. 931-936
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 50, No. 6 ( 1995-6-1), p. 931-936
    Abstract: The new compounds Y 7 I 12 C 2 N and Ho 7 I 12 C 2 N have been prepared by reaction of stoichiometric amounts of the metals (RE), REI 3 , REN and C in closed Ta capsules at 1150 and 1120K, respectively. Pure samples of the compounds were obtained after 5 days annealing time. The crystals with xenomorphic shape are olive-green (Y 7 I 12 C 2 N) or red-brown (Ho 7 I 12 C 2 N) in colour and sensitive to air and moisture. Y 7 I 12 C 2 N crystallizes in the space group P 1̄ (No. 2) with lattice constants a = 971.24(7), b = 1030.38(7), c = 1673.58(11) pm and α = 101.366(5), β = 92.758(5), γ = 112.799(5)°. According to Guinier photographs Ho7I12C2N is isotypic with the lattice consiants u - 968.8(3), b = 1028.7(3), r. = 1667.8(5) pm and α = 101.31(2), β = 92.78(2), γ = 112.80(1)°. In the structure the C atoms are present as C 2 units with a C -C distance of 144 pm. These C 2 units are octahedrally coordinated by Y atoms (o 1 ). The N atoms are in the center of Y 4 tetrahedra, which are linked via a common edge to form double tetrahedra (t 2 ). By condensation of N-centered double tetrahedra (t 2 ) with a C 2 -centered Y octahedron (o 1 ) the characteristic units o 1 t 2 o 1 are formed. The I atoms coordinate all free edges and corners of these units and connect them via I i - I a contacts parallel [100] and [001] . The compounds are semiconducting. Ho 7 I 12 C 2 N exhibits Curie-Weiss behaviour with θ = 15(1) K and μ eff = 10.5(1) μ B .
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-1995-0615
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 1995
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 9
    Online Resource
    Online Resource
    The layered ferromagnet Cs2AgF4: Antiferromagnetic inter-layer coupling driven by magnetic dipole-dipole interactions
    Walter de Gruyter GmbH ; 2010
    In:  Zeitschrift für Kristallographie Vol. 225, No. 11 ( 2010-01)
    Details
    In: Zeitschrift für Kristallographie, Walter de Gruyter GmbH, Vol. 225, No. 11 ( 2010-01)
    Type of Medium: Online Resource
    ISSN: 0044-2968
    URL: Article
    DOI: 10.1524/zkri.2010.1305
    RVK:
    TE 1000
    Language: Unknown
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2010
    SSG: 13
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  • 10
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    Online Resource
    Contributions of phase composition and defect structure to the long term stability of Li/MgO catalysts
    Walter de Gruyter GmbH ; 2012
    In:  International Journal of Materials Research Vol. 103, No. 12 ( 2012-12-01), p. 1488-1498
    Details
    In: International Journal of Materials Research, Walter de Gruyter GmbH, Vol. 103, No. 12 ( 2012-12-01), p. 1488-1498
    Abstract: The phase composition and defect structure of the system Li 2 O–MgO was investigated in terms of the long term stability of Li/MgO catalysts. The Li content was varied from 0 to 7 mol.%. Pure Li · MgO solid solutions were prepared via a special washing procedure. Li contents below 0.04 wt.% were stabilized within the MgO host lattice, whereas higher Li contents were found to segregate as Li 2 O and Li 2 CO 3 phases. The catalytic activity in the oxidative coupling of methane was found to decay for all catalysts over a period of 19 h on stream, accompanied by a loss of Li as LiOH. Li in the Li · MgO solid solution was found to be more stable in the lattice than in the surface region of the solid. However, impedance measurements on transition metal stabilized Li/MgO catalysts indicated that even the Li ions within the Li · MgO solid solution are not sufficiently stabilized. Thus, neither the Li compounds nor the dissolved Li ions within the Li/MgO solution seem to be truly stable at 750°C under catalytic conditions.
    Type of Medium: Online Resource
    ISSN: 2195-8556 , 1862-5282
    URL: Article
    DOI: 10.3139/146.110812
    RVK:
    ZG 1100
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2012
    detail.hit.zdb_id: 2232675-3
    detail.hit.zdb_id: 2128058-7
    detail.hit.zdb_id: 203021-4
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