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  • 1-Sinapoylglucose:L-malate sinapoyltransferase (control)  (1)
  • single-photon emission CT
  • 1
    Electronic Resource
    Electronic Resource
    Cerebral haemodynamic changes after endovascular treatment of arteriovenous malformations: Evaluation by single-photon emission CT (1994)
    Springer
    Acta neurochirurgica 127 (1994), S. 142-150 
    Details
    ISSN: 0942-0940
    Keywords: Arteriovenous malformation ; endovascular treatment ; cerebral haemodynamic changes ; single-photon emission CT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cerebral haemodynamic changes in 17 patients with cerebral arteriovenous malformations (AVMs), who showed hypoperfusion on single-photon emission computed tomography (SPECT) before endovascular treatment, were studied after embolization. Nine of them had non-haemorrhagic clinical manifestations and the other eight had a history of intracranial haemorrhage. Obliteration of AVMs was nearly total in six patients and partial in eleven. New low density lesions on X-ray computed tomography (CT) developed in 3 of 6 patients after nearly total obliteration and one of 11 patients after partial obliteration. The first SPECT after embolization showed diminished hypoperfusion in 11 of 13 patients without new low density lesions and one of 4 patients with new low density lesions. Diminution of hypoperfusion was seen even in two patients who underwent SPECT study immediately after the embolization. Cerebral circulation was improved in five of eight patients with low density lesions before embolization and in nine of eleven patients after partial obliteration. Hypoperfused state in the haemorrhagic group tended to remain unchanged compared with that in the non-haemorrhagic group. The hypoperfused area was expanded after embolization in three patients with new cerebral infarction. It is important for improvement of cerebral circulation to reduce the shunt flow without causing new infarction due to the embolization itself. In one of two patients who had a hyperperfused area surrounding the AVM after embolization, an unexpected and abnormal degree of brain swelling and haemorrhage occurred at the end of the surgery 20 days after the embolization. In the other patient, total extirpation was successfully performed after confirming disappearance of hyperperfusion in the follow-up SPECT. SPECT allows repeated measurement of the cerebral blood flow pattern easily and safely, and is useful for AVM management.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01808757
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence for a relationship between malate metabolism and activity of 1-sinapoylglucose: L-malate sinapoyltransferase in radish (Raphanus sativus L.) cotyledons (1986)
    Springer
    Planta 167 (1986), S. 212-217 
    Details
    ISSN: 1432-2048
    Keywords: Amino acid synthesis (inhibition) ; Malate ; Nitrogen nutrition ; Phenylpropanoid metabolism ; Raphanus ; Seedling development ; 1-Sinapoylglucose:L-malate sinapoyltransferase (control)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The control of malate metabolism and stimulation of 1-sinapolyglucose: L-malate sinapoyltransferase (SMT) activity in radish (Raphanus sativus L. var. sativus) cotyledons has been studied. The light-induced and nitrate-dependent activity of SMT catalyzes the formation of O-sinapoly-L-malate via 1-O-sinapoyl-β-D-glucose. When dark-grown radish seedlings, cultivated in quartz sand with nutrient solution containing NO 3 - as the sole N source, were treated with light, SMT activity increased concomitantly with free malate in the cotyledons. This light effect was suppressed in seedlings grown in a culture medium which contained in addition to NO 3 - also NH 4 + . However, treatment with methionine sulfoximine neutralized this ammonium effect, resulting again in both rapid accumulation of malate and rapid increase in SMT activity. When seedlings grown on NO 3 - nitrogen were subsequently supplied with NH 4 + nitrogen, the accumulated level of L-malate rapidly dropped and the SMT increase ceased. The enzyme activity decreased later on, reaching the low activity level of plants which were grown permanently on NO 3 - /NH 4 + -nitrogen. An external supply (vacuum infiltration) of malate to excised cotyledons and intact seedings, grown on NO 3 - /NH 4 + -nitrogen medium, specifically promoted a dose-dependent increase in the activity of SMT. In summary these results provide evidence indicating that the SMT activity in cotyledons of Raphanus sativus might be related to the metabolism of malic acid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391417
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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