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  • 1
    Electronic Resource
    Electronic Resource
    Alkaloids of Jordanian Thalictrum isopyroides
    Amsterdam : Elsevier
    Phytochemistry 25 (1986), S. 935-939 
    Details
    ISSN: 0031-9422
    Keywords: Ranunculaceae ; Thalictrum isopyroides ; aporphine alkaloids ; bisbenzylisoquinoline alkaloids. ; dehydroaporphine alkaloids ; oxoaporphine alkaloids ; roots
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(86)80030-9
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  • 2
    Electronic Resource
    Electronic Resource
    Quaternary alkaloids of Thalictrum cultratum
    Amsterdam : Elsevier
    Phytochemistry 26 (1987), S. 3003-3004 
    Details
    ISSN: 0031-9422
    Keywords: Ranunculaceae ; Thalictrum cultratum ; aporphine alkaloid. ; protoberberine alkaloids ; quaternary alkaloids ; roots
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)84580-X
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  • 3
    Electronic Resource
    Electronic Resource
    Quaternary alkaloids of Thalictrum foliolosum
    Amsterdam : Elsevier
    Phytochemistry 22 (1983), S. 2607-2610 
    Details
    ISSN: 0031-9422
    Keywords: Ranunculaceae ; Thalictrum foliolosum ; aporphine alkaloids, benzylisoquinoline alkaloids. ; protoberberine alkaloids ; quaternary alkaloids ; roots
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(83)80176-9
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  • 4
    Electronic Resource
    Electronic Resource
    The role of mitochondria in sulfolipid biosynthesis by Euglena chloroplasts
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism 1001 (1989), S. 268-273 
    Details
    ISSN: 0005-2760
    Keywords: (Euglena) ; Chloroplast ; Cysteine sulfinic acid ; Mitochondrion ; S-Sulfocysteine ; Sulfite ; Sulfolipid biosynthesis
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0005-2760(89)90110-0
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  • 5
    Electronic Resource
    Electronic Resource
    Chlorophyll biosynthesis from glutamate or 5-aminolevulinate in intact Euglena chloroplasts (1985)
    Springer
    Planta 165 (1985), S. 12-22 
    Details
    ISSN: 1432-2048
    Keywords: 5-Aminolevulinic acid ; Chlorophyll synthesis ; Chloroplast ; Euglena ; Glutamic acid ; Protein synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chloroplasts observed, by electron microscopy, to be intact and uncontaminated, with high rates of light-dependent protein synthesis and CO2 fixation were isolated from cells grown on low-vitamin-B12 medium in the light or from cells grown in the same medium in the dark and then exposed to light for 36 h. Both types of chloroplasts were active but less variability was encountered with developing chloroplasts from 36-h cells. The 36-h chloroplasts showed good light-dependent incorporation of 5-amino-levulinic acid (ALA) or l-glutamic acid into chlorophyll (Chl) a which was linear for approx. 1 h. The specific activity of the Chl a remained the same after conversion to pheophytin a, methylpheophorbide a or pyromethylpheophorbide a and rechromatography, indicating that the label was in the tetrapyrrole. Incorporation of ALA was inhibited by levulinic acid, and by chloramphenicol and other inhibitors of translation of 70S-type chloroplast ribosomes at concentrations which did not appreciably inhibit photosynthesis but which blocked plastid protein synthesis nearly completely. Cycloheximide, an inhibitor of translation on 87S cytoplasmic ribosomes of Euglena, was without effect. The 70S inhibitors did not block uptake of labeled ALA. Although labeled glycine was taken up by the plastids, no incorporation into Chl a was observed. Thus the developing chloroplasts appear to contain all of the enzymatic machinery necessary to convert glutamic acid to Chl via the C5 pathway of ALA formation but the Shemin pathway from succinyl coenzyme A and glycine to ALA appears to be absent. The requirement for plastid protein synthesis concomitant with Chl synthesis indicates a regulatory interaction and also indicates that at least one protein influencing Chl synthesis is synthesized on 70S-type plastid ribosomes and is subject to metabolic turnover.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392206
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  • 6
    Electronic Resource
    Electronic Resource
    Comments on the translational and transcriptional origin of Euglena chloroplastic aminoacyl-tRNA synthetases (1976)
    Springer
    Archives of microbiology 109 (1976), S. 201-203 
    Details
    ISSN: 1432-072X
    Keywords: Euglena gracilis ; W3BUL ; Chloroplast ; Mitochondria ; Phenylalanyl-tRNA ; Synthetase ; Streptomycin ; Cycloheximide ; tRNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A response to: “A consideration of Euglena gracilis W3BUL as a cytoplasmic control for the wild-type phenylalanyl-tRNA synthetase system” and “A reinvestigation of the sites of transcription and translation of Euglena chloroplastic phenylalanyl-tRNA synthetase” by J. L. Lesiewicz and D. S. Herson.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446628
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  • 7
    Electronic Resource
    Electronic Resource
    Precambrian Shield Wetlands: Hydrologic Control of the Sources and Export of Dissolved Organic Matter (1998)
    Springer
    Climatic change 40 (1998), S. 167-188 
    Details
    ISSN: 1573-1480
    Keywords: wetlands ; forested catchments ; dissolved organic carbon ; carbon cycling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Most Precambrian Shield forested catchments have some wetland component. Even small riparian wetlands are important modifiers of stream chemistry. Dissolved organic matter (DOM) is one of the most important products exported by wetlands in streams. Stratigraphic control of hydraulic conductivity generally leads to decreasing conductivity with depth. Thus important flowpaths occur in the uppermost organic rich layers and are reflected in chemical profiles of dissolved organic carbon (DOC). Accumulation of DOC in peat porewaters is the net effect of production, consumption and transport. DOC profiles vary with degree of interaction with the surrounding upland catchment and distance from the edge of the wetland as well as internal processes within the wetland. In wetlands, DOM production is offset by flushing resulting in decreasing DOC concentrations with increasing flows. Despite old carbon (2,000 to 3,000 years) at relatively shallow depths, 14C activity in DOC exported from wetlands is mostly modern (recent carbon), consistent with shallow flowpaths and export of DOM from shallow organic rich horizons. In contrast, the source area for DOM in upland catchments with developed B horizon soils increases with antecedent soil moisture conditions resulting in increasing DOC concentrations with higher stream flows. Activity of 14C in stream DOC from upland catchments span a range from low activities (older carbon) similar to B horizon soil water during dry moisture conditions to values slightly less than modern (more recent carbon) during high moisture conditions. The more modern carbon activities reflect the increased contribution of the organic rich litter and A horizon soil layers in the area immediately bordering the stream under wet antecedent moisture conditions. Reduced hydrologic export or loss of wetlands under drier climatic conditions may result in in larger fluctuations in stream DOC concentrations and reduced DOM loads to lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005496331593
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  • 8
    Electronic Resource
    Electronic Resource
    Sources and flowpaths of dissolved organic carbon during storms in two forested watersheds of the Precambrian Shield (1998)
    Springer
    Biogeochemistry 41 (1998), S. 175-197 
    Details
    ISSN: 1573-515X
    Keywords: carbon cycling ; dissolved organic carbon (DOC) ; forested catchments ; nutrient export ; Precambrian Shield streams ; storm runoff
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Dissolved organic carbon (DOC) concentrations and export were studied in two small catchments in central Ontario to examine DOC sources and to assess the hypothesis that organic matter adjacent to the stream is a significant contributor of DOC during storms. Different DOC dynamics and exports were observed according to the depth of the riparian water table. In Harp 4-21, riparian flowpaths were predominantly through A and upper B soil horizons and riparian soils contributed between 73 and 84% of the stream DOC export during an autumn storm. In Harp 3A, riparian flowpaths were predominantly through lower B horizons. Consequently, riparian soils were less important and hillslopes contributed more than 50% of the stream DOC export in subcatchments without wetlands during storms. Wetlands and adjacent soils contributed significantly to DOC export in Harp 3A; 8% of the total catchment area exported 32 to 46% of the storm runoff DOC. DOC export dynamics in wetlands and riparian soils were distinctly different. In wetlands, transport was affected by leaching and flushing of DOC at the wetland surface leading to lower DOC concentrations with successive storms. In riparian soils, groundwater flowpaths were more important and stronger positive relationships between discharge and DOC concentration were observed. Precipitation, throughfall and stemflow were minor sources of stream DOC during storms and contributed less than 20% of the total export.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005903428956
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  • 9
    Electronic Resource
    Electronic Resource
    Export of DOC from forested catchments on the Precambrian Shield of Central Ontario: Clues from 13C and 14C (1997)
    Springer
    Biogeochemistry 36 (1997), S. 43-65 
    Details
    ISSN: 1573-515X
    Keywords: dissolved organic carbon ; forested catchments ; lakes ; 14C ; 13C ; carbon isotopes ; carbon cycling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Export of dissolved organic carbon (DOC) from forested catchmentsis governed by competing processes of production, decomposition, sorptionand flushing. To examine the sources of DOC, carbon isotopes (14Cand 13C) were analyzed in DOC from surface waters, groundwatersand soils in a small forested catchment on the Canadian Shield in centralOntario. A significant fraction (greater than 50%) of DOCin major inflows to the lake is composed of carbon incorporated into organicmatter, solubilized and flushed into the stream within the last 40 years. Incontrast, 14C in groundwater DOC was old indicating extensiverecycling of forest floor derived organic carbon in the soil column beforeelution to groundwater in the lower B and C soil horizons. A small uplandbasin had a wide range in 14C from old groundwater values atbaseflow under dry basin conditions to relatively modern values during highflow or wetter antecedent conditions. Wetlands export mainly recently fixedcarbon with little seasonal range. DOC in streams entering the small lakemay be composed of two pools; an older recalcitrant pool delivered bygroundwater and a young labile pool derived from recent organic matter.The relative proportion of these two pools changes seasonally due thechanges in the water flowpaths and organic carbon dynamics. Althoughchanges in local climate (temperature and/or precipitation) may alterthe relative proportions of the old and young pools, the older pool islikely to be more refractory to sedimentation and decomposition in thelake setting. Delivery of older pool DOC from the catchment andsusceptibility of this older pool to photochemical decomposition mayconsequently be important in governing the minimum DOC concentrationlimit in lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005744131385
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