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Oxidative damage and defense mechanisms in primary leaves of Phaseolus vulgaris as a result of root assimilation of toxic amounts of copper (1996)

Weckx, Jolanda E. J. ; Clijsters, Herman M. M.

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 96 (1996), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: We studied the sequence of several metabolic reactions, representative for oxidative damage and protection, in primary leaves of Phaseolus vulgaris (cv. Limburgse vroege) as a function of root assimilation of a toxic sublethal Cu concentration (630 μM). A transient increase of products of membrane peroxidation was observed in the primary leaves during the period of Cu uptake. This rise was mainly due to the oxidizing properties of copper itself and not to a stimulation of the lipoxygenase (EC 1.13.11.12) activity. In our experimental conditions, membrane lipid peroxidation and K+-leakage were not directly related; during at least three days after Cu application to the roots, when products of lipid peroxidation were already detected in the leaf, permeability of the cytoplasmic membrane for K+ was improved. However, Cu stimulated the capacity of catalase (EC 1.11.1.6) and ascorbate peroxidase (EC 1.11.1.11). These enzymes protect the tissue against oxidative stress since at least the hydrogen peroxide content was significantly reduced. Superoxide dismutase (EC 1.15.1.1) was not involved in this defense mechanism.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1996.tb00465.x

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The cervical spine in rheumatoid arthritis: relationship between neurologic signs and morphology on MR imaging and radiographs (1996)

Reijnierse, M. ; Bloem, Johan L. ; Dijkmans, Ben A. C. ; [et al.]

Springer

Skeletal radiology 25 (1996), S. 113-118

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ISSN: 1432-2161

Keywords: Key words Rheumatoid arthritis ; Cervical spine ; Cervical myelopathy ; Magnetic resonance imaging

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract Objective. Comparison of clinically observed neurologic long tract signs in a heterogeneous group of patients with rheumatoid arthritis (RA), with morphologic abnormalities of the cervical spine as depicted on radiographs and magnetic resonance (MR) images. Design. The patients were prospectively assigned to one of three classes on the basis of their neurologic status. Lateral cervical spine radiographs and sagittal T1-weighted and gradient echo images were performed. The qualitative MR features evaluated were erosion of the dens and atlas, brain stem compression, subarachnoid space encroachment, pannus around the dens, appearance of the fat body caudal to the clivus, and the signal intensity of the pannus. The quantitative imaging parameters were the cervicomedullary angle and the distance of the dens to the line of McRae. Patients. Sixty-three consecutive patients with RA and subjective symptoms, especially neck or occipital pain, and/or clinical objective signs consistent with a compromised cervical cord were included in this study. Results and conclusions. Damage documented with radiographs and MR imaging in patients with RA is often severe, even in those without neurologic signs (class 1). None of the abnormalities confined to the atlantoaxial level correlated significantly with neurologic classification. Subarachnoid space encroachment anywhere in the entire cervical spine did correlate significantly with neurologic classification.