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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 19 (1996), S. 0 
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Significantly different water relations attributes were derived for temperate conifers measured using the repeat pressurization (RP) and composite (CM) pressure–volume (PV) procedures. In the RP method, single shoots were measured 10–20 times for xylem water potential and mass during air-drying to produce each PV curve. In contrast, for CM PV curves 25–30 shoots were air-dried to relative water contents (R) ranging from 1.0 to 0.5 before being pressurized once. Aggregation of these 25–30 paired values produced single PV curves. Pinus banksiana, P. resinosa and Picea mariana, but not Pinus strobus, had lower full turgor osmotic potential, shallower slope of the linear segment of the PV curves and higher symplast fraction with the CM method. Data points along the linear segment of PV curves were obtained to lower R using the CM method. Reanalysis using similar R ranges eliminated differences between PV methods for Picea mariana but not Pinus banksiana and P. resinosa.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 15 (1992), S. 0 
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Electrical impedance measurements made on white spruce, Picea glauca (Moench) Voss, stems were related to shoot free sugar contents and to osmotic, turgor and water potential. During seasonal dormancy induction, there were commensurate increases in free sugar contents, osmotic potential at full turgor and impedance which resulted in linear relationships among these variables. When measured over the course of laboratory drying, impedance increased curvilinearly with decreasing relative water content. There was a linear increase in impedance with decreasing water potential, with a break point coincident with the turgor loss point, possibly attributed to disruption to current flow through broken plasmodesmatal connections between adjacent cells. This technique offers a non-destructive method to measure tissue free sugar content, and therefore, short- and long-term shifts in parameters historically derived from pressure-volume analysis.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0014-5793
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0014-5793
    Keywords: Archaebacteria ; Fumarate hydratase ; Gene cloning ; Solfolobus solfataricus ; Thermostable enzyme
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Alimentary pharmacology & therapeutics 22 (2005), S. 0 
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background : Preliminary clinical and experimental results suggest that iron can modify hepatocytes’ insulin sensitivity by interfering with insulin receptor and intracellular insulin signalling.Aim : To evaluate in vivo the influence of iron on insulin resistance and insulin release in patients with non-alcoholic fatty liver disease and in vitro the interaction between iron and insulin sensitivity by analysing the effect of iron manipulation on insulin receptor expression in hepatoblastoma HepG2 cell line.Results : Insulin resistance evaluated by homeostatis model assessment (HOMA)-insulin resistance significantly decreased after diet, and a further reduction was observed after phlebotomies. Iron depletion by desferrioxamine increased by twofold the 125I-insulin-specific binding, whereas iron addition reduced insulin binding, similarly to cells exposed to high glucose concentration.Conclusion : Iron status affects insulin sensitivity by modulating the transcription and membrane expression/affinity of insulin receptor expression in hepatocytes and influencing insulin-dependent gene expression suggesting that increased insulin clearance and decreased insulin resistance may contribute to the positive effect of iron depletion in patients with non-alcoholic fatty liver disease.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The possible implication of NADP-dependent malic enzyme (NADP-ME; L-malate:NADP oxidoreductase [oxaloacetate-decarboxylating], EC 1.1.1.40) in fatty acid synthesis was examined in Ricinus communis L. cotyledons, NADP-ME catalyses the conversion of L-malate to pyruvate and NADPH, potential substrates for fatty acid synthesis. NADP-ME activity and protein levels were monitored during germination, up to 20 days postimbibition. The developmental profile showed a peak in activity (6 times with respect to the basal value) and immunoreactive protein (a single 72-kDa band using anti-maize NADP-ME antibodies) around day 7. The enzyme was partially purified (41-fold) and its kinetics characterized. The optimum pH was around 7.1. Km values for L-malate and NADP+ were 0.68 mM and 8.2 μM respectively. The enzyme used Mg2+ or Mn2+ as essential cofactors. Several metabolites were assayed as potential enzyme modulators. Succinate, CoA, acetyl-CoA and palmitoyl-CoA were activators of NADP-ME, at saturating or sub-saturating substrate concentrations, K2 values for CoA and derivative compounds were in the micromolar range (i.e., 0.8 μM for acetyl-CoA). No significant effects were obtained with other Krebs cycle intermediates and amino acids (i.e. 2-oxoglutarate, glutamate, glutamine, fumarate). The activity was 29 times higher in the forward (decarboxylating) direction compared to the reverse direction. These results hint at cotyledon NADP-ME behaving as a regulatory enzyme in R. communis. Its activity is responsive to metabolites of the fatty acid synthesis pathway, and thus a role in this metabolism is suggested.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 97 (1996), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Two methods of rehydrating red pine (Pinus resinosa Ait.) shoots for pressure-volume (PV) analysis were compared to clarify the effects of rehydration on estimated tissue water relations of shoots and fascicles. The commonly employed cut-shoot method was compared to rehydration by means of water uptake through the roots of intact plants. Cut-shoot rehydration and increased duration of rehydration significantly decreased estimates of tissue elasticity and relative water content at zero turgor for both shoots and fascicles. Rehydration of cut shoots for 2 days significantly increased the slope of the linear region of shoot pressure-volume (PV) curves and decreased estimates of the apoplastic water fraction. Changes in these and estimates of other water relations attributes were correlated with increased initial water content during rehydration. Estimated apoplastic water fraction was higher for needle fascicles than shoots despite the large amount of woody stem tissue contained in shoots. Fascicle water status strongly influenced shoot water relations, in part due to apparent apoplastic loading with water of fascicles during rehydration.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 663 (1992), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 76 (1989), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Winter hardening of first-year black spruce [Picea mariana (Mill.) B.S.P.] seedlings was studied by assessing a number of morphological and physiological changes under three hardening regimes: 1) early removal (ER), in which seedlings were exposed to natural daylengths and low ambient temperatures outside. 2) extended greenhouse culture (EG), in which seedlings were exposed to natural daylengths and warm temperatures, and 3) short day (SD), in which seedlings were exposed to short daylengths and low ambient temperatures outside. Measurements included needle primordia initiation, embryonic shoot volume, terminal bud mitotic index, embryonic shoot average cell volume, and shoot tip frost hardiness. EG seedlings formed buds containing 4 times as many needle primordia as ER stock. Embryonic shoot volume increased with number of needle primordia initiated, until late in the hardening period, when significant reductions in meristem volumes of SD and EG stock were observed. Frost hardiness increased sooner in seedlings which set bud in response to short days, but SD treatment did not result in significantly greater frost hardiness at the end of the trial. Frost hardiness was correlated with mitotic index of the embryonic shoot. Cell size in the embryonic shoot declined in seedlings of all treatments during hardening, however, EG seedlings had significantly lower cell volumes by the end of the trial in comparison to ER and SD seedlings.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Morphometrie ; Histopathologie ; Megakaryozyten ; CML ; Chronische myeloproliferative Erkrankungen ; Key words Morphometry ; Histopathology ; Megakaryocytes ; CML ; Chronic myeloproliferative disorders
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Morphometric analysis of sections of biopsy specimens from patients with chronic myeloproliferative disorders (CMPD) can complement the individual histological diagnosis and help to distinguish the four groups of CMPD. A total of 130 diagnostic biopsies from 29 cases of chronic myelocytic leukemia (CML.CT), 26 cases of (CML.MI), 28 of essential thrombocythemia (PTH), 26 cases of chronic megakaryocytic granulocytic myelosis (CMGM), and 21 of polycythemia vera (P. vera), and 30 from healthy control persons were evaluated morphometrically in sections of undecalcified plastic-embedded core biopsies. Clear distinctions were revealed in size of megakaryocytes, nuclear lobulation, clustering, and the nuclear size and shape of megakaryocytes. Nuclear size and cellular size were significantly less in CML (range of means of cellular size: 220–360 μm2) than in the other three Ph1-negative groups (range of means: 480–750 μm2). Nuclear lobulation was more distinct in PTH than in P. vera, and especially in CMGM. Clustering of megakaryocytes was more than twice as frequent in CMGM (8.0–10.5 %) as in any of the other three groups (0.1–7.0 %). Naked nuclei were more numerous in all groups of CMPD. The main topic of the study is the different size of megakaryocytes in the four main groups of CMPE, allowing a distinction between small-megakaryocytic Ph1-positive CML and large-megakaryocytic Ph1-negative forms of CMPD.
    Notes: Zusammenfassung Morphometrische Untersuchungen an histologischen Schnitten von Biopsien chronischer myeloproliferativer Erkrankungen (CMPE) können die individuelle histologische Diagnose unterstützen und zur Unterscheidung der 4 Gruppen der CMPE beitragen. Eine Gesamtzahl von 130 Biopsien, unterteilt in 29 Fälle von CML ohne Megakaryozytenvermehrung (CML.CT), 26 Fälle von CML mit Megakaryozytenvermehrung (CML.MI), 28 Fälle von essentieller Thrombozythämie (PTH), 26 Fälle von chronischer megakaryozytär-granulozytärer Myelose (CMGM) und 21 Fälle von Polycythämia vera (P. vera) sowie eine Anzahl von 30 Kontrollbiopsien gesunder Personen wurden morphometrisch untersucht in Schnitten von nicht entkalkten, in Plastik eingebetteten Knochenmarkbiopsien. Sichere Unterscheidungen der Gruppen sind möglich durch • Größe der Megakaryozyten, • Kernlobulierung und Kerngröße und • die Form der Megakaryozyten. Kern- und Zellfläche waren bei der CML signifikant kleiner (Streuung der Mittelwerte der Zellfläche: 220–360 μm2) als bei den 3 Ph1-negativen Erkrankungen (Streuung der Mittelwerte der Zellfläche: 480–750 μm2). Die Kernlobulierung war bei der PTH ausgeprägter als bei der CMGM und der P. vera. Das Clustering von Megakaryozyten war mehr als doppelt so häufig bei der CMGM (8,0–10,5 %), verglichen mit den 3 anderen CMPE (0,1–7,0 %). – Nacktkernige Megakaryozyten waren gegenüber den Kontrollen bei allen CMPE erhöht. Hauptergebnis ist die unterschiedliche Größe der Megakaryozyten zwischen der CML und den 3 Ph1-negativen Gruppen, so daß von der kleinmegakaryozytäre Ph1-positive CML und den großmegakaryozytäre Ph1-negativen CMPE gesprochen werden kann.
    Type of Medium: Electronic Resource
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