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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 15 (1968), S. 0 
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Plasmodium lophurae hemozoin (malaria pigment) is a heme-containing protein which is distinctly different from hemoglobin and hematin by immunologic, spectrophotometric, fingerprint, heme-iron, gel filtration, and starch gel electrophoretic analyses. The calculated average molecular weight of P. lophurae hemozoin is ca. 40,000. Hemozoin contains at least 3 antigenic components and shows some indication of cross-reaction with hemoglobin.
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 38 (1990), S. 1269-1271 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 1387-1389 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Avian malaria, Plasmodium lophurae, was maintained by syringe passage in White Pekin ducklings according to the methods of Trager5. Blood was withdrawn from the jugular vein into heparinized syringes, centrifuged in the cold (1,5007, 4 C) and cells resuspended in their own plasma at concentrations ...
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 38 (1985), S. 15-21 
    ISSN: 1570-7458
    Keywords: photosynthesis ; physiology ; insect-plant interactions ; Liriomyza trifolii ; celery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les conductances des stomates et du mésophylle, la transpiration et la photosynthèse varient considérablement suivant la position des feuilles dans un pied de céleri (Apium graveolens L.) mais ces paramètres sont identiques pour des folioles opposées. En utilisant de telles folioles comparables, une réduction singificative de l'activité photosynthétique du céleri a été observée lors des dégâts alimentaires par les larves et les adultes de Liriomyza trifolii Burg. (Dipt. Agromyzidae). Dans des essais en champ où des populations de L. trifolii ont été contrôlées avec des insecticides, les nombres de pétioles et de folioles et la hauteur des plantes étaient significativement plus élevés là où les traitements avaient entraîné de faibles densités de mineuses. Dans les parcelles où L. trifolii avait été avantagé, la récolte avait été retardée jusqu'à 3 semaines. Des essais parallèles au laboratoire ont montré que les insecticides utilisés dans ces essais au champ, n'avaient ni accéléré, ni retardé la croissance du céleri. Aucun des paramètres physiologiques mesurés après 1,5 heure ou 7 jours après le traitement n'avait été modifié.
    Notes: Abstract Stomatal conductance, mesophyll conductance, transpiration and photosynthesis varied considerably by within-plant locations on celery (Apium graveolens L.), but specific opposite leaves proved equivalent. Using such comparable leaves, feeding damage by Liriomyza trifolii (Burgess) (Diptera: Agromyzidae) larvae or adults was found to reduce significantly the capacity of celery for photosynthetic activity. In field trials where populations of L. trifolii were manipulated with pesticides, numbers of leaves, plant height, and numbers of petioles per plant were significantly greater in treatments with low leafminer densities. In treatments where L. trifolii was encouraged, harvest was delayed by up to 3 weeks. Related laboratory studies indicated that the pesticides used in the field trial neither promoted nor slowed celery growth. None of the physiological parameters measured at either 1.5 h or 7 days post-treatment was significantly affected.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 70 (1986), S. 85-91 
    ISSN: 1432-1939
    Keywords: CAM ; Portulacaria afra ; Portulaccaceae ; 14CO2-uptake ; Drought effect ; Recovery ; C3/CAM shift
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Gas exchange characteristics of droughted and rewatered Portulacaria afra were studied during the seasonal shift from CAM to C3 photosynthesis. 14CO2 uptake, stomatal conductance, and total titratable acidity were determined for both irrigated and 2, 4, and 7.5 month waterstressed plants from summer 1984 to summer 1985. Irrigated P. afra plants were utilizing the CAM pathway throughout the summer and shifted to C3 during the winter and spring. Beginning in September, P. afra plants shifted from CAM to CAM-idling after 2 months of water-stress. When water-stress was initiated later in the fall, exogenous CO2 uptake was still measurable after 4 months of drought. After 7.5 months of stress, exogenous CO2 uptake was absent. The shift from CAM to CAM-idling or C3 in the fall and winter was related to when water stress was initiated and not to the duration of the stress. Gas exchange resumed within 24 h of rewatering regardless of the duration of the drought. In the winter and spring, rewatering resulted in a full resumption of daytime CO2 uptake. Whereas during the summer, rewatering quickly resulted in early morning CO2 uptake, but nocturnal CO2 uptake through the CAM pathway was observed after 7 days. Gas exchange measurements, rewatering characteristics, and transpirational water loss support the hypothesis that the C3 pathway was favored during the winter and spring. The CAM pathway was functional during the summer when potential for water loss was greater. Our investigations indicate that P. afra has a flexible photosynthetic system that can withstand long-term drought and has a rapid response to rewatering.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 33 (1978), S. 1-15 
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Measurements of acid metabolism and gas exchange were carried out four times during a year to assess the relative importance of temperature and the accompanying seasonal change to the carbon metabolism of Opuntia basilaris Engelm. & Bigel. plants growing in situ under irrigated and natural (control) conditions. Our experiments showed that this cactus did not change its pattern of carbon assimilation when continuously irrigated under field conditions. Non-irrigated cacti had maximum acid accumulation after periods of precipitation. Maximum acid accumulation in irrigated cacti occurred when there was a large difference between day/night temperatures (i.e., 16°C), and when nighttime temperatures were moderate (14C). Irrigated cacti had greater duration of stomatal opening and lower resistance to 14CO2 uptake. When temperatures were low, daytime stomatal resistance to 14CO2 uptake decreased (to 20–40 s cm-1), but never to the level of the nocturnal resistances (5–10 s cm-1). During periods of drought, nonirrigated cycti changed to a pattern in which organic acids fluctuated. Irrigated cacti continued to have 14CO2 uptake when nighttime temperatures were as high as 33°C. 13C/12C isotope composition ratios, determined after two years of irrigation, were near -12‰ in irrigated and non-irrigated plants. Therefore, under conditions of continual irrigation, seasonal and temperature changes affected the degree of dark CO2 fixation and acid metabolism, but these cacti did not change from CAM to CO2 fixation in the light.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Photosynthesis research 2 (1981), S. 39-48 
    ISSN: 1573-5079
    Keywords: abscisic acid ; Crassulacean acid metabolism ; water stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Water stress induces Crassulacean acid metabolism (CAM)† in Portulacaria afra as manifested by day stomatal closure, organic acid fluctuation, and night CO2 uptake. We now have evidence that abscisic acid treatment of leaves causes partial stomatal closure that is accompanied by the induction of CAM in a manner similar to water stress. There appears to be an inverse relationship between exogenous CO2 uptake and decarboxylation of organic acids in that organic acids remain high during the day providing stomata are open. When stomata close, there is consumption of organic acids by decarboxylation. The hypothesis is that stomatal opening controls CAM in this species.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Photosynthesis research 4 (1983), S. 203-211 
    ISSN: 1573-5079
    Keywords: CAM ; water-stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the leaf succulent Asclepiad Hoya carnosa (L.) R. Br., CAM photosynthesis occurred under well-watered conditions, as characterized by diurnal gas exchange and changes in titratable acidity. Following 10–12 days of severe water stress, the plants shifted from CAM to a modified CAM-idling mode of metabolism. CAM-idling was characterized by complete or almost complete stomatal closure accompanied by CAM-like diurnal changes in titratable acidity. H. carnosa plants maintained this CAM-idling mode of photosynthesis for at least 8 weeks. Upon reirrigation, the plants returned to the original CAM mode within 1 week. These results suggested that CAM-idling is a reversible, intermediate form of sustained metabolism which enables plant survival under conditions of extended drought.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Photosynthesis research 4 (1983), S. 203-211 
    ISSN: 1573-5079
    Keywords: CAM ; water-stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the leaf sueculent Asclepial Hoya carnosa (L.) R. Br., CAM photosynthesis occurred under well-watered conditions, as characterized by diurnal gas exchange and changes in titratable acidity. Following 10–12 days of severe water stress, the plants shifted from CAM to a modified CAM-idling mode of metabolism. CAM-idling was characterized by complete or almost complete stomatal closure accompanied by CAM-like diurnal changes in titratable acidity. H. carnosa plants maintained this CAM-idling mode of photosynthesis for at least 8 weeks. Upon reirrigation, the plants returned to the original CAM mode within 1 week. These results suggested that CAM-idling is a reversible, intermediate form of sustained metabolism which enables plant survival under conditions of extended drought.
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  • 10
    Publication Date: 1990-05-01
    Print ISSN: 0021-8561
    Electronic ISSN: 1520-5118
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
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