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  • 1
    ISSN: 1432-1920
    Keywords: Brain infarctions ; Sickle cell disease ; Cerebral blood flow ; Xenon-CT ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The cerebral blood flow (CBF) of 25 patients with sickle cell cerebrovascular disease (SCCVD) was examined using a Xenon-CT flow mapping method. Brain CT and MR findings were correlated with those of the Xenon-CT flow studies. CBF defects on Xenon-CT correlated reasonably well with the areas of cortical infarctions on the MR images, but in 27% of the cases, flow defects were slightly larger than the areas of infarctions on the MR images. In deep watershed or basal ganglia infarctions, abnormal CBF was noted about the cerebral cortex near infarctions in 72% of the patients, regardless of infarction sizes on the MR images. However, decreased CBF was recognized in 4 of the 9 children whose MR images were virtually normal. Thus, the extent of flow depletion cannot be predicted accurately by MR imaging alone. Xenon-CT flow mapping proved a safe and reliable procedure for evaluation of the CBF of patients with SCCVD. Although this study is preliminary, it may have a potential in selecting patients for hypertransfusion therapy, as a noninvasive test and for following children with SCCVD during their therapy. Careful correlation of results of CBF with those of MR imaging or of CT is important for objective interpretations of flow mapping images.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 34 (1983), S. 13-19 
    ISSN: 1570-7458
    Keywords: Grape phylloxera ; Viteus vitifolii ; Resistant rootstocks ; Life tables ; Cabernet Sauvignon ; Muscat of Alexandria ; Ganzin I ; St. George
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Le Phylloxera de la vigne, Viteus vitifolii Shimer, a été élevé sur des racines coupées en boîte de Pétri. Les tables de vie ont été établies en utilisant deux variétés sensibles de Vitis vinifera L. (Cabernet—Sauvignon et Muscat d' Alexandrie) et deux variétés résistantes de Vitis rupestris (Saint Georges en Ganzin I). Sur les variétés résistantes, le Phylloxera avait des taux de fixation du premier stade plus faibles (24 et 9.5%) que sur les variétés sensibles (57 et 36%). De la même façon, les taux bruts (G.R.R.) et nets (R0) de la reproduction étaient plus bas sur les variétés résistantes que sur les variétés sensibles. La durée moyenne d'une génération (T) était variable (19 à 49 jours) et ne paraissait pas liée à la sensibilité des variétés. Le taux net d'accroissement (λ) était inférieur à 1 sur les variétés résistantes, contre 1,06 et 1,10 sur les variétés sensibles. Sur Cabernet—Sauvignon, le Phylloxera avait des valeurs de G.R.R., R0 et T supérieures sur les tubérosités que sur les nodosités. Cependant les valeurs de λ étaient à peu près égales (1,05 et 1,07, respectivement) sur les tubérosités et les nodosités.
    Notes: Summary Grape phylloxera, Viteus vitifolii Shimer, were reared on excised grape roots maintained in petri-dish chambers. Life tables were constructed using 2 susceptible rootstocks, Vitis vinifera L. Cabernet Sauvignon and Muscat of Alexandria, and 2 resistant rootstocks V. rupestris St. George and Ganzin I. Phylloxera on the resistant varieties had lower rates of 1st-instar establishment (24% and 9.5%) than on the susceptible varieties (57% and 36%). Similarly, gross reproductive rates (GRR) and net reproductive rates (R0) on the resistant varieties were lower than on the susceptible varieties. Mean generation times (T) were variable (19–49 days) and appeared not to be related to rootstock susceptibility. Finite rates of increase (λ) were less than 1.0 on the resistant varieties, and 1.06 and 1.10 on the susceptible varieties. Phylloxera on Cabernet Sauvignon tuberosities had higher GRR, R0 and T-values than on the nodosities. However, λ-values were nearly equal, 1.05 and 1.07 on the tuberosities and nodosities, respectively.
    Type of Medium: Electronic Resource
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