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  • 1
    Call number: QH301Z:36/56
    Keywords: Nuclear membranes
    Pages: xviii, 344 p. : ill. (some col.)
    ISBN: 0415346452
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta applicandae mathematicae 2 (1984), S. 333-352 
    ISSN: 1572-9036
    Keywords: 46L10 ; 46L55 ; 46L60 ; 43A35 ; 47C10 ; 47D05 ; 82A15 ; Infinitesimal generator ; derivation ; dissipation positive semigroups ; compact groups ; locality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A survey of the recent work on the infinitesimal generators of one-parameter semigroups of positivity preserving maps on operator algebras, in the presence of compact symmetry groups or flows.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Planta 172 (1987), S. 265-272 
    ISSN: 1432-2048
    Keywords: Calcium transport ; Endomembrane ; Pisum (Ca2+ transport) ; Plasma membrane ; Root (Ca2+ transport) ; Tonoplast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Calcium transport has been studied using purified endomembrane vesicles from dark-grown roots of Pisum sativum L. Membranes from a mixed microsomal (non-mitochondrial) fraction showed ATP-dependent calcium uptake which was released by the ionophore A 23187, had a pH optimum of 7.2 and required Mg2+ for uptake. Membranes were further purified using a rapid sucrosedensity-gradient technique yielding vesicles suitable for transport studies, and were identified using marker enzymes. Uptake by plasma membrane, tonoplast, endoplasmic reticulum and Golgi apparatus was indicated. Uptake by membranes of low density (predominantly tonoplast) had a pH optimum of 7.2–7.4 and nucleotide specificity ATP〉 guanosine 5′-triphosphate〉inosine 5′-triphosphate〉ADP〉, while that by high-density membranes had a pH optimum of 7.5–7.9 and less specificity for ATP. The importance of regulating sucrose concentrations in calcium transport studies was demonstrated.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Planta 172 (1987), S. 273-279 
    ISSN: 1432-2048
    Keywords: Antiport ; Galcium pumping ATPase ; Calcium transport ; Calmodulin ; Endomembrane ; Pisum (Ca2+ transport) ; Root (Ca2+ transport)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Calcium transport by purified endomembrane vesicles from roots of Pisum sativum L. was studied. Two types of ATP-dependent transport were demonstrated, protonophore-sensitive calcium/proton antiport and protonophore-insensitive transport. The former was predominantly located in the tonoplast, while the latter was associated with the plasma membrane and Golgi apparatus. Calcium uptake by membranes of low buoyant density (tonoplast) was inhibited by nitrate and was not sensitive to sodium orthovanadate while that by membranes of high buoyant density (plasma membrane, Golgi apparatus) was inhibited by sodium orthovanadate and insensitive to nitrate. Endoplasmic reticulum also took up calcium in the presence of ATP; however, because of its imperfect separation from the tonoplast, the nature of the calcium-transport system present could not be fully characterised. None of the calcium transporters were stimulated by calmodulin or inhibited by calmodulin inhibitors.
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  • 5
    ISSN: 1432-2048
    Keywords: Calmodulin-stimulated ATPase ; Plasma membrane (Ca2+ transport) ; Zea (Ca2+ transport)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The calmodulin-stimulated ATPase of maize (Zea mays L.) coleoptiles has been purified by calcium-dependent binding to a calmodulin affinity column. In the presence of protease inhibitors (phenylmethylsulfonylfluoride and chymostatin) a polypeptide of relative molecular mass (Mr) 140000 (±10000) is obtained on sodium-dodecylsulphate polyacrylamide gels. This polypeptide is recognised specifically by an affinity-purified polyclonal antibody to mammalian calmodulin-stimulated calcium-pumping ATPases and is of similar Mr to the erythrocyte-membrane calcium pump (138000 Mr).
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  • 6
    ISSN: 1432-2048
    Keywords: Key words: Aluminium toxicity ; Hydroxyaluminosilicate ; Malate ; Root length ; Silicon ; Triticum (Al toxicity)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Two wheat (Triticum aestivum L.) cultivars, one aluminium tolerant (Atlas 66) and one sensitive (Scout 66), were grown in a continuous-flow culture system (≤pH 5.0) containing aluminium (0–100 μM) and silicon (0–2000 μM) in factorial combination. Treatment with silicon resulted in a highly significant amelioration of aluminium toxicity as assessed by root growth in both cultivars. Amelioration was influenced by wheat cultivar and silicon concentration, as 2000 μM silicon significantly ameliorated the toxic effects of 100 μM aluminium in Atlas 66, and only 5 μM silicon alleviated the effect of 1.5 μM aluminium on Scout 66. Nutrient medium pH was critical, as an amelioration by silicon was apparent only at pH 〉 4.2 for Atlas 66, and at pH 〉 4.6 for Scout 66. Silicon neither reduced levels of toxic aluminium species in the growth solutions, nor the amount of aluminium taken up by roots. In experiments to assess exudation of malate by Atlas 66 roots treated with 100 μM aluminium, the presence of 2000 μM silicon (pH 4.6) was found to have a negligible effect on exudation. In contrast, citrate, a known aluminium chelator, reduced aluminium-induced exudation of malate at 5–40 μM and completely inhibited it at 100 μM citrate. The results indicate that silicon does not reduce aluminium phytotoxicity as a result of aluminium/silicon interactions in the external media, and that the mechanism of amelioration has an in planta component.
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  • 7
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract: In this paper we further analyze modular invariants for subfactors, in particular the structure of the chiral induced systems of M-M morphisms. The relative braiding between the chiral systems restricts to a proper braiding on their “ambichiral” intersection, and we show that the ambichiral braiding is non-degenerate if the original braiding of the N-N morphisms is. Moreover, in this case the dimensions of the irreducible representations of the chiral fusion rule algebras are given by the chiral branching coefficients which describe the ambichiral contribution in the irreducible decomposition of α-induced sectors. We show that modular invariants come along naturally with several non-negative integer valued matrix representations of the original N-N Verlinde fusion rule algebra, and we completely determine their decomposition into its characters. Finally the theory is illustrated by various examples, including the treatment of all SU(2) k modular invariants.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We obtain some results on time evolution in quasi local algebras, which are used to derive the scattering of quasi free evolution groups in the CAR algebra by certain inner perturbations.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Given a family of completely positive maps, indexed by a group, from aC*-algebra into itself, we are concerned with its dilation to a group of *-automorphisms on a larger algebra. A Schwarz-type inequality forn-positive *-linear mappings from an involutive algebra into the bounded linear operators on a hilbert space is obtained. Strongly continuous one-parameter semigroups and groups onC*-algebras, which have certain positivity properties, are studied.
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  • 10
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We investigate the state on theC*-algebra of Pauli spins on a one-dimensional lattice (infinitely extended in both directions) which gives rise to the thermodynamic limit of the Gibbs ensemble in the two-dimensional Ising model (with nearest neighbour interaction). It is shown that the representation of the Pauli spin algebra associated with the state is factorial above and at the known critical temperature, while it has a two-dimensional center below the critical temperature. As a technical tool, we derive a general criterion for a state of the Pauli spin algebra corresponding to a Fock state of the Fermion algebra to be primary. We also show that restrictions of two quasifree states of the Fermion algebra to its even part are equivalent if and only if the projection operatorsE 1 andE 2 (on the direct sum of two copies of the basic Hilbert space) satisfy the following two conditions: (1)E 1 −E 2 is in the Hilbert-Schmidt class, (2)E 1 ∧ (1 −E 2) has an even dimension, where the even-oddness of dimE 1 ∧ (1 −E 2) is called ℤ2-index ofE 1 andE 2 and is continuous inE 1 andE 2 relative to the norm topology.
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