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1

Immunochemical comparison of the glutamate dehydrogenase isoenzymes in yellow lupin root nodules

100%
Ratajczak L., Prus-Glowacki W., Ratajczak W., Lehmann T.
Acta Biochimica Polonica
|
1989
|
tom 36
|
nr 3-4
2
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Elasticity and viscosity of carrot root tissue at different rate of deformation

84%
Golacki K., Stankiewicz A., Stropek Z.
Polish Journal of Food and Nutrition Sciences
|
2007
|
tom 57
|
nr 2[A]
63-66
Viscosity of foods and their mechanical properties are essential for modeling the mechanical behaviour of foods during deformation and flow. The rheological models are used for engineering calculations, e.g., during design of food processing machines, pumping systems, packaging machines, etc. Although the classical linear rheology is a rate-independent theory, the mechanical properties of the viscoelastic plant materials depend on a deformation rate. The influence of a deformation rate on mechanical properties of biological viscoelastic materials needs to be documented and it is the aim of this paper. It is proved, based on the Maxwell model, that the modulus of elasticity and the viscosity ratio are decreasing functions of the rate of deformation. Next, the modulus of elasticity and the viscosity ratio of the carrot cylindrical samples are determined using discrete-time measurements of the reaction force obtained in the compression and relaxation tests at a wide range of preliminary deformation rates, i.e. from 1.67×10–4 m·s-1 to 1.5 m·s-1. The relaxation data were processed using a four-element Maxwell model and the changes in viscoelastic constants were determined as a function of the deformation rate. The stress relaxation both in the state of uniaxial stress as well as in the state of uniaxial strain is considered. The experimental results are in good agreement with theoretical analysis for the biological material considered. The results motivate hypothesis that the number of microcrackings increases along with the deformation rate and indicate the irreversible character of the changes that proceed in plant materials under loading.
3

Toxic influence of aluminum on root microstructure of red pepper [Capsicum annuum L.]

84%
Konarska A.
Electronic Journal of Polish Agricultural Universities. Series: Horticulture
|
2008
|
tom 11
|
nr 4
4
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Phenolic compounds and properties of antioxidants in grapevine roots [Vitis vinifera L.] under drought stress followed by recovery

67%
Weidner S., Karolak M., Karamac M., Kosinska A., Amarowicz R.
Acta Societatis Botanicorum Poloniae
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2009
|
tom 78
|
nr 2
97-103
Grapevine seedlings Vitis vinifera were grown in a greenhouse under optimum conditions (soil moisture ca 70%) and under drought stress (soil moisture ca 35%). In addition, some of the plants subjected to drought underwent subsequent regeneration under optimum conditions. Drought stress caused accumulation of total phenolic compounds in grapevine roots, which may indicate that these compounds play an important role in the adaptation of roots to growth under stress conditions. Phenolic acids found in the roots occurred in the ester-bound form only. p-coumaric acid was present in the highest concentrations (6.2 to 10.5 µg/g fresh matter). The content of ferulic acid was lower, ranging from 2.4 to 4.6 µg/g fresh matter. The lowest concentration in grapevine roots was achieved by caffeic acid (2.4 to 2.9 µg/g fresh matter). The levels of p-coumaric and ferulic acids in roots rose significantly under the drought stress, while the concentration of caffeic acid increased during the post-drought recovery period. This may suggest that some of the phenolic acids protect plants under stress conditions. All the extracts from grapevine roots had antioxidative properties, but the antiradical activity of the extracts obtained from roots subjected to drought stress was inferior to the control. The same extracts were also characterised by depressed reducing power. The results imply that tolerance of grapevine to soil drought may be associated with the value of antioxidative potential in root tissues of these plants.
5

Evaluation of new vegetative clones of apple rootstocks

67%
Jakubowski T., Omiecinska B., Zagaja S.
Journal of Fruit and Ornamental Plant Research
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1993
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tom 01
|
nr 2
6

Changes in antioxidant levels in Oryza sativa L. roots subjected to NaCl-salinity stress

67%
Khan M. H., Singha K. L. B., Panda S. K.
Acta Physiologiae Plantarum
|
2002
|
tom 24
|
nr 2
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