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  • 1
    Electronic Resource
    Electronic Resource
    Cerebral blood flow mapping using stable Xenon-enhanced CT in sickle cell cerebrovascular disease (1990)
    Springer
    Neuroradiology 32 (1990), S. 289-295 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00593047
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  • 2
    Electronic Resource
    Electronic Resource
    Demography of a native strain of the melon fly, Dacus cucurbitae, from Hawaii (1985)
    Springer
    Entomologia experimentalis et applicata 38 (1985), S. 195-199 
    Details
    ISSN: 1570-7458
    Keywords: melon fly ; Dacus cucurbitae ; demography ; life tables ; host studies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Le développement préimaginal et les taux de survie d'une souche sauvage de D. cucurbitae de Hawaí sur six hôtes courants ont été examinés à 25°C. Ces résultats ont été combinés aux informations récoltées sur la survie des adultes, la fécondité et la fertilité pour réaliser des tables de vie. La durée du stade oeuf est légèrement supérieure à un jour pour cette espèce. La durée de développement de l'éclosion de l'oeuf à l'imago et les taux de survie ont été respectivement de 17 à 20 jours et de 35 à 85% suivant les hôtes. La fécondité brute (ponte totale) a été de 1293 oeufs par femelle, tandis qui ‘la fertilité’ (nombre total d'oeufs fertiles pondéré par les taux d'éclosion et de survie des adultes) était de 518 oeufs fertiles par femelle. Le taux d'accroissement (λ) variait de 1,08 à 1,12 suivant l'hôte sur lequel D. cucurbitae a été élevé. La proportion d'adultes dans une distribution en âge stable était d'environ 14% sur tous les hôtes.
    Notes: Abstract Preadult development and survival rates for a wild strain of melon fly in Hawaii were examined when reared on six common hosts at 25°C. These data were combined with information gathered on adult survival, fecundity and fertility in order to construct life tables. The duration of the egg stage was slightly over 1 day for this species. Depending on host, larval-to-adult development and survival rates were 17–20 days and 35–85%, respectively. Gross fecundity (total eggs) was 1293 eggs/♀ while net fertility (total fertile eggs weighted by hatch and adult survival) was 518 fertile eggs/♀. The finite rate of increase (λ) for the species was conditional on the host on which it was reared and ranged from 1.08 to 1.12. The percent of adults in the stable age distribution averaged around 14% over all hosts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00361932
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  • 3
    Electronic Resource
    Electronic Resource
    Life tables of phylloxera on resistant and susceptible grape rootstocks (1983)
    Springer
    Entomologia experimentalis et applicata 34 (1983), S. 13-19 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00300894
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  • 4
    Electronic Resource
    Electronic Resource
    Demographic analyses of organophosphate-resistant and susceptible strains of greenhouse whitefly, Trialeurodes vaporariorum, on three cotton cultivars (1992)
    Springer
    Entomologia experimentalis et applicata 65 (1992), S. 21-30 
    Details
    ISSN: 1570-7458
    Keywords: Greenhouse whitefly ; Trialeurodes vaporariorum ; demography ; resistant ; susceptible ; cotton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laboratory experiments were conducted using organophosphate-resistant and susceptible strains of greenhouse whitefly, Trialeurodes vaporariorum Westwood, to assess age-specific vital rates in individually-held adults, and development and survival in preadults on three cotton cultivars at 27±1 °C, 50±10% RH, and a photoperiod of 16:8 (L:D). Female whiteflies lived longer than males, with a maximum life expectancy of 29 days. Heaviest egg laying occurred at ages between 7 and 18 days when individual whiteflies laid 〉 10 eggs/day. Greenhouse whitefly populations doubled weekly, with stable age distribution of 63% eggs, 28% larvae, 5% pupae, and 4% adults. Analysis of various life history parameters that combine aspects of survival, developmental rates, and fecundity indicated no consistent differences in reproductive fitness between the two greenhouse whitefly strains. Of the three cotton cultivars tested, Pima S-6 was most susceptible, Acala SJ-2 was intermediate and Gumbo 500 was most resistant to greenhouse whitefly. Resistance of Gumbo 500 was expressed as slower developmental rates, reduced survival to adulthood, lower reproductive rates, and lower intrinsic rate of increase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189713
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