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  • 1
    Electronic Resource
    Electronic Resource
    AN AUTOMATED METHOD FOR DETERMINATION OF TERRAMYCIN (1960)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 87 (1960), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1960.tb23243.x
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrastructure of meiosis in the hollyhock rust fungus,Puccinia malvacearum I. Prophase I — Prometaphase I (1981)
    Springer
    Protoplasma 108 (1981), S. 225-244 
    Details
    ISSN: 1615-6102
    Keywords: Fungus ; Meiosis ; Puccinia malvacearum ; Spindle pole body
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A thoroughly documented account of the ultrastructure of the meiotic spindle pole body (SPB) cycle in a rust (Basidiomycota, Uredinales) is presented for the first time. The three-dimensional structure of the SPB and spindle during meiosis in the hollyhock rust fungusPuccinia malvacearum is analyzed from serial sections of preselected stages. This paper covers prophase I to prometaphase I. At late prophase I, the nucleolus disperses and does not reappear until the end of meiosis. The SPB at late prophase I consists of two, 4-layered discs, 0.8–1.0 μm in diameter, connected by a middle piece (MP). The SPB is associated with a differentiated region of the nuclear envelope and nucleoplasm. At late diplotene to diakinesis, each disc generates a half spindle as it inserts into an otherwise intact nuclear envelope. The MP connecting the interdigitating half spindles elongates and eventually splits transversely during subsequent spindle elongation. Each half MP, which is attached to a SPB disc, becomes inserted in a sheath-like extension of the nuclear envelope. The intranuclear late prometaphase I spindle always becomes oriented perpendicularly to the longitudinal axis and sagittal plane of the metabasidium. There are 200–290 spindle microtubules (MTs) at each SPB at late prometaphase. The nonkinetochore MTs form a coherent central spindle around which the kinetochore MTs and bivalents are spread. A metaphase plate is absent. The results are compared with SPB behavior and spindle structure in early meiosis of other basidiomycetes and ascomycetes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02224421
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructure of meiosis in the hollyhock rust fungus,Puccinia malvacearum II. Metaphase I—Telophase I (1981)
    Springer
    Protoplasma 108 (1981), S. 245-263 
    Details
    ISSN: 1615-6102
    Keywords: Fungus ; Meiosis ; Puccinia malvacearum ; Spindle pole body
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The three-dimensional structure of the spindle pole body (SPB) and meiotic spindle during early metaphase I through telophase I inPuccinia malvacearum is analyzed ultrastructurally from serial sections. During early metaphase I the spindle rotates from the perpendicular to a position oblique to the longitudinal axis and parallel to the sagittal plane of the cell. Tubular cisternae are present within the spindle at this stage. The half middle piece (MP) subtends a collateral disc (co-disc) which is inserted eccentrically within each SPB. The SPB, co-disc and half MP at opposite poles are in mirror image. During the transition from early metaphase I to full metaphase I, the spindle orients parallel to the lateral wall of the promycelium and the half MPs are lost. The co-discs partially detach from each discoid SPB and maintain this relation until the end of interphase I. Co-discs become further differentiated as they attach to the subtending sheath-like extension of the nuclear envelope previously occupied by the half MPs. Microvesicles within the nucleoplasm are specific to mid metaphase I. A metaphase plate is absent. The 14 bivalents, which are directly connected to each polar SPB by 2 to 3 kinetochore MTs, are spread over nearly the entire length of the central spindle. The first anaphasic movement involves asynchronous shortening of the kinetochore MTs while the second consists of extensive pole-to-pole elongation. Astral MTs first appear at early metaphase I and become most numerous at anaphase I. An intact nuclear envelope constricts against the central spindle at either end of the interzonal region. Concurrently, centripetal growth of the nuclear envelope under each SPB results in their gradual externalization by the end of telophase I. The sibling nuclei are cut off by constriction of the nuclear envelope at either end of the interzonal region. These meiotic stages inP. malvacearum are compared with those in other basidiomycetes and ascomycetes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02224422
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrastructure of meiosis in the hollyhock rust fungus,Puccinia malvacearum (1981)
    Springer
    Protoplasma 108 (1981), S. 265-288 
    Details
    ISSN: 1615-6102
    Keywords: Fungus ; Meiosis ; Phylogeny ; Puccinia malvacearum ; Spindle pole body
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Changes in the spindle pole body (SPB) and meiotic nuclei from interphase I through interphase II in the hollyhock rustPuccinia malvacearum are analyzed ultrastructurally by three-dimensional reconstructions from serial sections. Interphase I nuclei undergo a coordinated migration and rotation during which the SPBs approach the convex face of the lateral promycelial wall. During the transition from interphase I to prometaphase II, the collateral disc (co-disc) apparently enlarges and fuses with the main disc of the SPB. The resulting single SPB nucleates two confluent half spindles and about 225 astral microtubules (MTs). Co-discs and middle pieces (MPs) are absent during division II. SPBs separate and form metaphase II intranuclear spindles oriented in a predictable manner. Tubular cisternae are present within the spindle at early metaphase II. The architecture of the spindle at division II is essentially identical to that reported for division I except that the spindle is about half as long. Anaphase-telophase II nuclear envelope constriction, separation of the sibling nuclei, and externalization of the SPBs is identical to that reported for division I. Genesis of the duplicated interphase II SPB apparently occurs rapidly and involves formation of the MP followed by the three-layered SPB discs. General aspects of the division II spindle are discussed. A model for the meiotic SPB cycle in a rust is presented and its phylogenetic and functional significance in relation to other basidiomycetes and ascomycetes is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02224423
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  • 5
    Electronic Resource
    Electronic Resource
    Existence results for non-autonomous multiple-fragmentation models (1997)
    Chichester, West Sussex : Wiley-Blackwell
    Mathematical Methods in the Applied Sciences 20 (1997), S. 1313-1323 
    Details
    ISSN: 0170-4214
    Keywords: Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
    Notes: We investigate an initial-value problem modelling fragmentation processes where particles split into two or more pieces at a rate, γ, that not only depends on the sizes of the particles involved but also on time. The existence of non-negative, mass-conserving solutions is established by considering a truncated version of an associated non-autonomous abstract Cauchy problem. The latter has solutions of the form u(t)=Un(t,t0)f, t≥t0, where f is the known data at some fixed time t0≥0 and {Un(t,s)}t0≤s≤t≤T is a uniformly continuous evolution system. A limit evolution system {U(t,s)}t0≤s≤t≤T is shown to exist. Depending on the form of the known data f at time t0, the scalar-valued function u, obtained from the limit evolution system via u(x, t)=[U(t, t0)f](x) for a.e. x〉0, t≥t0, is a solution of either the original initial-value problem or an integral version of this problem. © 1997 B. G. Teubner Stuttgart-John Wiley & Sons Ltd.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Existence and uniqueness results for the non-autonomous coagulation and multiple-fragmentation equation (1998)
    Chichester, West Sussex : Wiley-Blackwell
    Mathematical Methods in the Applied Sciences 21 (1998), S. 1067-1084 
    Details
    ISSN: 0170-4214
    Keywords: Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
    Notes: An initial-value problem modelling coagulation and fragmentation processes is studied. The results of earlier papers are extended to models where either one or both of the rates of coagulation and fragmentation depend on time. An abstract integral equation, involving the solution operator to the linear fragmentation part, is investigated via the contraction mapping principle. A unique global, non-negative, mass-conserving solution to this abstract equation is shown to exist. The latter solution is used to generate a global, non-negative, mass-conserving solution to the original non-autonomous coagulation and multiple-fragmentation equation. © 1998 B. G. Teubner Stuttgart-John Wiley & Sons Ltd.
    Type of Medium: Electronic Resource
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  • 7
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    Analysis of low energy X-ray and excitation spectra of Ba 35+ (1996)
    Springer
    Details
    Publication Date: 1996-09-03
    Print ISSN: 0178-7683
    Electronic ISSN: 1431-5866
    Topics: Physics
    Published by Springer
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  • 8
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    Dependence of dielectronic recombination cross sections on the charge states for the vanadium ion (1985)
    American Physical Society
    Details
    Publication Date: 1985-03-01
    Print ISSN: 0556-2791
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Physical Society
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  • 9
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    Dielectronic recombination cross section for B III (1983)
    American Physical Society
    Details
    Publication Date: 1983-07-01
    Print ISSN: 0556-2791
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Physical Society
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  • 10
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    Dielectronic-recombination rate coefficients for the lithium isoelectronic sequence (1984)
    American Physical Society
    Details
    Publication Date: 1984-02-01
    Print ISSN: 0556-2791
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Physical Society
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