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  • Nodulation  (2)
  • Rhizobium  (2)
  • 13.10.+q  (1)
  • 78.70  (1)
  • Anterior disk displacement  (1)
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  • 1
    ISSN: 1432-0630
    Keywords: 78.70 ; 61.70 ; 07.77
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A slow-positron source has been installed in the therminal of an electrostatic 6.5 MeV accelerator and provides a monoenergetic positron beam in the few-MeV range. It will be used to operate a “fast” positron lifetime spectrometer based onβ + γ coincidences. The properties of the beam, the expected performance of the spectrometer, its advantages over conventionalγγ lifetime measurements, a number of intended applications, as well as recent positron-electron scattering experiments and plans for positron channelling and channelling-radiation studies are outlined.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2048
    Keywords: Mutant (Rhizobium) ; Nodulation ; Capsule (bacterial) ; Lectin ; Polysaccharide ; Rhizobium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Spontaneous mutants with altered capsule synthesis were isolated from a marked strain of the symbiont,Rhizobium japonicum. Differential centrifugation was used to enrich serially for mutants incapable of forming capsules. The desired mutants were detected by altered colony morphology and altered ability to bind host plant lectin. Three mutants failed to form detectable capsules at any growth phase when cultured in vitro or in association with the host (soybean,Glycine max (L.) Merr.) roots. These mutants were all capable of nodulating and attaching to soybean roots, indicating that the presence of a capsule physically surrounding the bacterium is not required for attachment or for infection and nodulation. Nodulation by several of the mutants was linearly proportional to the amount of acidic exopolysaccharide that they released into the culture medium during the exponential growth phase, indicating that such polysaccharide synthesis is important and perhaps required for nodulation. Two of the mutants appeared to synthesize normal lectin-binding capsules when cultured in association with host roots, but not when cultured in vitro. Nodulation by these mutants appeared to depend on how rapidly after inoculation they synthesized capsular polysaccharide.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2048
    Keywords: Glycine (Rhizobium infection) ; Infection thread ; Rhizobium ; Root hair infection ; Symbiosis (legume-Rhizobium)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The location and topography of infection sites in soybean (Glycine max (L.) Merr.) root hairs spot-inoculated with Rhizobium japonicum have been studied at the ultrastructural level. Infections commonly developed at sites created when the induced deformation of an emerging root hair caused a portion of the root-hair cell wall to press against an adjacent epidermal cell, entrapping rhizobia within the pocket between the two host cells. Infections were initiated by bacteria which became embedded in the mucigel in the enclosed groove. Infection-thread formation in soybean appears to involve degradation of mucigel material and localized disruption of the outer layer of the folded hair cell wall by one or more entrapped rhizobia. Rhizobia at the site of penetration are separated from the host cytoplasm by the host plasmalemma and by a layer of wall material that appears similar or identical to the normal inner layer of the hair cell wall. Proliferation of the bacteria results in an irregular, wall-bound sac near the site of penetration. Tubular infection threads, bounded by wall material of the same appearance as that surrounding the sac, emerge from the sac to carry rhizobia roughly single-file into the hair cell. Growing regions of the infection sac or thread are surrounded by host cytoplasm with high concentrations of organelles associated with synthesis and deposition of membrane and cell-wall material. The threads follow a highly irregular path toward the base of the hair cell. Threads commonly run along the base of the hair cell for some distance, and may branch and penetrate into subjacent cortical cells at several points in a manner analagous to the initial penetration of the root hair.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2102
    Keywords: Schlüsselwörter MRT ; Kiefergelenk ; Diskusverlagerung ; Morphometrie ; Key words MRI ; Temporomandibular joint ; Anterior disk displacement ; Metric analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In order to evaluate magnetic resonance imaging (MRI) changes in correlation with different degrees of internal derangement of the temporomandibular joint, we evaluated 117 joints of 59 symptomatic patients and 31 volunteers. Data analysis included morphologic and morphometric characteristics. Sixteen joints (19 %) were considered normal, 40 demonstrated anterior displacement with reduction (47 %) and 27 anterior displacement without reduction (32 %). In three of the volunteers anterior displacement with reduction was noted. Advancing anterior position of the disk was associated with reduced ability to open the mouth, progressive deformity and shortening of the disk, thinning of the bilaminar zone, regressive and proliferative bony changes of the condyle, reduced translatory movement of the disk and condyle, thinning of joint space, cranial and dorsal displacement of the condyle and flattening of the slope of the tuberculum. In addition to alterations in condylar and disk morphology, MRI can demonstrate various additional measurable changes that correlate well with the degree of anterior disk displacement.
    Notes: Zusammenfassung Um den Einfluß der Diskusverlagerung im Kiefergelenk auf die Gelenkbinnenstrukturen zu untersuchen, wurden insgesamt 117 Gelenke von 59 symptomatischen Patienten und 31 asymptomatischen Probanden in der MRT untersucht und die Gelenkbinnenstrukturen sowohl morphologisch wie morphometrisch beurteilt. Im Patientengut lag 16mal eine normale Diskusposition (NDP) (19 %), 40mal eine Vorverlagerung mit Reposition (VMR) (47 %) und 27mal eine Vorverlagerung ohne Reposition (VOR) (32 %) vor. Unter den Normalpersonen zeigten 3 eine VMR. Mit zunehmender Diskusvorverlagerung zeigte sich eine kleiner werdende maximale Mundöffnung, ein zunehmend deformierter und verkürzter Diskus, eine Ausdünnung der bilaminären Zone, eine Abnahme des Durchmessers und zunehmende Entrundung des Processus condylaris, eine verminderte translatorische Diskus- und Kondylusbeweglichkeit, eine Verschmälerung der Gelenkspaltweite, eine Verlagerung des Processus condylaris in geschlossener Mundposition nach kranial und dorsal und eine Abflachung des Kondylenbahnwinkels. Neben der Morphologie des Diskus und Kondylus bzw. deren Morphologie lassen sich damit eine ganze Reihe weiterer magnetresonanztomographisch quantifizierbarer Befunde im Rahmen von Verlagerungen des Diskus im Temporomandibulargelenk darstellen.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1434-601X
    Keywords: 13.10.+q ; 12.20.Fv ; 14.80.Pb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A monoenergetic positron (e +) beam (ΔT/T〈5·10−4) from the Stuttgart pelletron accelerator and a 4.6 mg/cm2 Be target has been employed to investigatee + e −scattering in the MeV region in a large solid angle with high statistics by means of a novel positionsensitive detector system. Superimposed on the Bhabha scattering, a structure has been found at ane + kinetic energy of 2263 keV (810 keV excitation energy in thee + e −rest frame). From the energy-integrated resonance cross-section of $$\sigma _{res} \cdot \Gamma _{res}^{e^ + e^ - } $$ ≅30 b·eV (c.m.) and the standard resonance cross-section we estimate partial resonance widths $$\Gamma _{res}^{e^ + e^ - } $$ ≅72 meV or 24 meV for total angular momenta J=0 or J=1, respectively. The structure, which has not been predicted within the framework of quantum electrodynamics, coincides with one of the sum energies of the correlatede + e −lines observed in heavy-ion collisions.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 115 (1983), S. 122-128 
    ISSN: 1615-6102
    Keywords: Inoculation ; Nodulation ; Rhizobium japonicum ; Soybean ; Symbiosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A method has been developed to inoculate soybean roots in the zone of susceptible root cells with nanoliter droplets containing the symbiont,Rhizobium japonicum. The position of inoculation is marked by means of ion exchange beads which adhere to the root surface. InoculatedR. japonicum cells from a nanoliter droplet spread over an area of approximately 35 host epidermal cells and have a high probability (∼ 80%) of inducing nodule formation at exactly the point of inoculation. The spot inoculation method is highly efficient in terms of the number of bacteria required to achieve a given probability of nodule formation. The method greatly facilitates ultrastructural analysis of the infection process and is useful for certain physiological studies of infection.
    Type of Medium: Electronic Resource
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