Analysis of mycorrhizal colonisation of Scots pine roots by electrical impedance spectroscopy

Poster

Optické metody studia adsorpce fibrinogenu a oligodeoxynukleotidů na povrchu titanu a titanových slitin.

Adsorpce fibrinogenu na povrch titanu hraje významnou roli při oseointehraci titanových implantátů. Adsorpce je ovlivněna fyzikálními vlastnostmi povrchu titanu.Adsorpce fibrinogenu na povrch titanu hraje významnou roli při oseointehraci titanových implantátů. Adsorpce je ovlivněna fyzikálními vlastnostmi povrchu titanu.Adsorption of fibrogen at the titanium surface is important for the oseointegration of titanium implants. Adsorption of fibrinogen at the titanium depends on the physical properties of the titanium surface

Lethal effects of waterlogging on Scots pine appear with delay

Poster

An appraisal of the electrical resistance method for assessing root surface area

Electrical resistances of roots and stems of hydroponically raised willows (Salix schwerinii) were studied and related to root morphology. Willow cuttings with and without roots were set in a constant electric field (effective voltage of 0.1 V, sine-AC, 128 Hz) in a hydroponic solution. The electrical resistance of different components in the measurement system was measured and analysed in relation to root surface area in contact with the cultivation solution. Axial resistivities of single root segments and of stems were measured. The results showed that the resistance decreased in relation to an increase in the contact surface area of the roots with the solution. The resistance depended strongly on the contact area of the stem with the solution, however, thus causing bias in the evaluation of root surface area. This work is a new contribution for the understanding of current pathways in the root system as exposed to an external electric field and for developing a non-destructive method to study plant roots accordingly. It may be concluded that the electrical resistance method is a useful non-destructive method to study roots and their physiological properties. Electrical analogues for roots and stem comprising resistors are discussed in relation to in situ measurements

Dielectric relaxations in starch-water solutions

201

Impedanssispektroskopian soveltaminen juurten kasvun mittaamiseen

TutkimusselosteSeloste artikkelista: Repo, T., Laukkanen, J. & Silvennoinen, R. 2005. Measurement of the tree root growth using electrical impedance spectroscopy. Silva Fennica 39(2): 159–16

ANTLER STRESS IN THE NASAL BONE REGION OF MOOSE

We used holographic nondestructive testing (HNDT) to study the impacts of antler-transmitted dynamic and shock-type forces which potentially affect development of the nasal region in moose skulls. Four different nasal region structures were used, and differences in the stability of the types studied were observed. The results were compared with deer skulls of different pedicel structure, and significant differences in biomechanics were found. Comparison between fresh- and dry- bone biomechanics Showed that dry bones may be used for biomechanical studies of thick-boned structures