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排序方式: 共有410条查询结果,搜索用时 15 毫秒
61.
62.
Orsolya Kinga Gondor Judit Tajti Kamirn ron Hamow Imre Majlth Gabriella Szalai Tibor Janda Magda Pl 《International journal of molecular sciences》2021,22(21)
Although the relationship between polyamines and photosynthesis has been investigated at several levels, the main aim of this experiment was to test light-intensity-dependent influence of polyamine metabolism with or without exogenous polyamines. First, the effect of the duration of the daily illumination, then the effects of different light intensities (50, 250, and 500 μmol m–2 s–1) on the polyamine metabolism at metabolite and gene expression levels were investigated. In the second experiment, polyamine treatments, namely putrescine, spermidine and spermine, were also applied. The different light quantities induced different changes in the polyamine metabolism. In the leaves, light distinctly induced the putrescine level and reduced the 1,3-diaminopropane content. Leaves and roots responded differently to the polyamine treatments. Polyamines improved photosynthesis under lower light conditions. Exogenous polyamine treatments influenced the polyamine metabolism differently under individual light regimes. The fine-tuning of the synthesis, back-conversion and terminal catabolism could be responsible for the observed different polyamine metabolism-modulating strategies, leading to successful adaptation to different light conditions. 相似文献
63.
Operation of fixed bed reactors with periodic flow reversal as proposed by Matros and co-workers is an unconventional mode of operation for exothermic, equilibrium limited catalytic reactions. In the present paper, reverse flow ammonia synthesis at 240–300 bar over a promoted iron catalyst is considered. The catalyst had a particle size of 1.0–1.5 mm to neglect the intra- and interparticle transport intrusions. Temperature profiles, which developed and moved back and forth through the laboratory scale reactor, depending upon the direction of the flow, and the exit ammonia concentration were monitored. The time average ammonia concentration observed in the non-steady-state of operation was exceeded by 5–27% the ammonia concentration obtained in similar but under steady-state conditions. The enhancement in the ammonia production was mainly due to the transient state of the catalyst surface and the dynamic behavior of the reactor bed. 相似文献
64.
Physical accessibility is recognised as an important driver or factor affecting landscape development in an increasing number of studies. This work uses cost-distance methods for analysis of landscape accessibility, and presents the analysis in three historical time periods focused on the effect of accessibility on landscape development in South Slovakia. First, from periods when the cultural landscape was forming, the effect of landscape accessibility on the location of settlements is given. The variables explaining the location of historical settlements are: slope steepness, accessibility to water expressed by distance to fluvial sediments and distance within 500 m from suitable soils for agriculture. The second example is from the second half of the twentieth century, when the small-scale agricultural landscape was transformed into large-scale fields suitable for industrial agriculture. Agricultural fields located on steeper slopes and closer to settlements were more likely to survive the collectivisation of agriculture. The third example shows accessibility as a factor affecting the abandonment of the remaining traditional agricultural landscapes (TAL) as a consequence of the economic and cultural changes triggered by the transition to an open market economy. The TAL located on less accessible areas are more likely affected by the abandonment. 相似文献
65.
Mihály Tapolyai Mária Faludi Virág Réti Zsolt Lengvárszky Tibor Szarvas Tibor Fülöp Gabriella Bekő Klára Berta 《Hemodialysis international. International Symposium on Home Hemodialysis》2013,17(3):406-412
Correct estimation of the dialysis patients' hydration status remains an important clinical challenge. Bioimpedance measurements have been validated by various physiological tests, and the use of brain‐type natriuretic peptide (BNP) has been validated by inferior vena cava diameter measurements. This is an observational cohort study that evaluated the correspondence between bioimpedance‐measured overhydration percentage (OH%) and BNP. We measured predialysis OH% by bioimpedance apparatus (Body Composition Monitor) and BNP by microparticle enzyme‐linked immunoassay in 41 prevalent stable hemodialysis patients, 19 (46%) women, aged 58.9 ± 14.5 years. The cohort's average BNP was 2694 ± 3278 pg/mL and 10 (24.4%) of these 41 patients had BNP < 500 pg/mL (average 260.7 ± 108.5). The OH% was 8.5 ± 7.0% among those with a BNP < 500 pg/mL, while the rest of the population had an OH% of 21.4 ± 8.0%, corresponding to excess volumes of 1.6 ± 1.3 and 4.4 ± 3.8 L, respectively. The OH% vs. BNP relationship was best described by the exponential regression of y = 216.4e0.097x, predicting a BNP of 216.4 pg/mL at 0% overhydration status (r 0.61). Receiver‐operating curves revealed an area under the curve of 0.885 for BNP when the OH% was set ≥15% of overhydration and an area under the curve of 0.918 for OH% when the BNP was set ≥500 pg/mL for being abnormal. We conclude that in our cohort there was a high degree of correspondence between these two tests with an exponential relationship between the measurements. 相似文献
66.
Robert Brüll Guru Geertz Hans Kothe Tibor Macko Michael Rudschuck Mirko Wenzel Kurt Engelsing Jürgen Wüst Martin Bastian 《大分子材料与工程》2008,293(5):400-408
The supramolecular structure in pipe walls of isotactic PP‐R is a function of compound composition and processing parameters, which both influence the mechanical properties of the pipes. µFTIR shows a gradient of the crystallinity across the pipe wall, with a lower‐crystalline outer layer, and a higher‐crystalline core layer. The rate of extrusion has an influence on the thickness of the outer layer. The nucleating effect on the morphological profile throughout the pipe wall can be visualised. µFTIR shows a homogeneous distribution of the primary antioxidant in the pipe wall. Both the spectral crystallinity and the antioxidant concentration distribution are calculated.
67.
Fábián TK Hermann P Beck A Fejérdy P Fábián G 《International journal of molecular sciences》2012,13(4):4295-4320
There are numerous defense proteins present in the saliva. Although some of these molecules are present in rather low concentrations, their effects are additive and/or synergistic, resulting in an efficient molecular defense network of the oral cavity. Moreover, local concentrations of these proteins near the mucosal surfaces (mucosal transudate), periodontal sulcus (gingival crevicular fluid) and oral wounds and ulcers (transudate) may be much greater, and in many cases reinforced by immune and/or inflammatory reactions of the oral mucosa. Some defense proteins, like salivary immunoglobulins and salivary chaperokine HSP70/HSPAs (70 kDa heat shock proteins), are involved in both innate and acquired immunity. Cationic peptides and other defense proteins like lysozyme, bactericidal/permeability increasing protein (BPI), BPI-like proteins, PLUNC (palate lung and nasal epithelial clone) proteins, salivary amylase, cystatins, prolin-rich proteins, mucins, peroxidases, statherin and others are primarily responsible for innate immunity. In this paper, this complex system and function of the salivary defense proteins will be reviewed. 相似文献
68.
In the present study, a novel windscreen wiper-on-cylinder machine has been used to investigate the influence of sliding speed
and normal force on the coefficient of friction. Using this machine it is possible to measure the friction force not only
on specimen level, as in former studies to be available in the literature, but also on structural level by considering the
whole windscreen wiper. As measurement results are strongly influenced by both the real, non-circular cross-section, and the
eccentricity of the rotating glass cylinder an analytical model has been developed to explain the measurement results. The
good agreement to be found between theory and experiment confirms the validity of the model. Majority of the results belongs
to partial contact where the wiper blade is not in contact with the glass countersurface along its total length. After the
discussion of experimental results, as a last step, authors made an attempt to compare quantitatively the predictive capability
of two different contact models widely used in mixed friction model of sliding rubber components. The results show that the
difference in film thickness due to solid–solid contact can be larger than three orders of magnitude in case of a typical
windscreen wiper. 相似文献
69.
70.
Camille Descour Tamara Meijer-Vissers Tibor Macko Matthew Parkinson Dario Cavallo Martin van Drongelen Gerhard Hubner Han Goossens Robbert Duchateau 《Polymer》2012,53(15):3096-3106
The zirconium acetamidinate catalyst {Cp*Zr(Me)2[N(Et)C(Me)N(tBu)]} (Cp* = ?5-C5Me5) was used to synthesize both random and block copolymers based on 4-methyl-1-pentene (4M1P) and 1-pentene. The polymers have been characterized by NMR spectroscopy, SEC, DSC, high temperature HPLC and CRYSTAF. Unexpectedly, the yields and molecular weights decreased with increasing amounts of 1-pentene. The reason for this behavior is that 1-pentene occasionally undergoes 2,1-misinsertions trapping the catalyst in a dormant state. These 2,1-misinsertions do not seem to occur with the bulky 4M1P (branched α-olefin). Adding a small amount of ethylene reactivates the catalyst. Unlike most semi-crystalline polymers, the density of the crystalline phase of isotactic P4M1P can be lower than of the amorphous phase, when crystallized under very high pressures. To characterize this peculiar behavior of 4M1P-based polymers, various samples have been subjected to Pressure-Volume-Temperature (PVT) measurements. While the P4M1P homopolymers and block copolymers show the expected decrease in specific volume upon crystallization, the 4M1P-rich random copolymers proved not to vary in specific volume under the same conditions. 相似文献