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Titolo:
HYDRODYNAMICS AND BIOMECHANICS OF THE SUBMERGED WATER MOSS FONTINALIS-ANTIPYRETICA - A COMPARISON OF SPECIMENS FROM HABITATS WITH DIFFERENTFLOW VELOCITIES
Autore:
BIEHLE G; SPECK T; SPATZ HC;
Indirizzi:
UNIV FREIBURG,INST BIOL 3,ARBEITSGRP BIOMECH,SCHANZLESTR 1 D-79104 FREIBURG GERMANY UNIV FREIBURG,BOT GARTEN D-79104 FREIBURG GERMANY
Titolo Testata:
Botanica acta
fascicolo: 1, volume: 111, anno: 1998,
pagine: 42 - 50
SICI:
0932-8629(1998)111:1<42:HABOTS>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
GIANT-KELP; FORCES; ADAPTATIONS; ORGANISMS; MODEL;
Keywords:
PLANTS; FONTINALIS ANTIPYRETICA; HYDRODYNAMICS; BIOMECHANICS; YOUNGS MODULUS; TENSILE STRENGTH; VISCOELASTICITY; PLASTICITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
G. Biehle et al., "HYDRODYNAMICS AND BIOMECHANICS OF THE SUBMERGED WATER MOSS FONTINALIS-ANTIPYRETICA - A COMPARISON OF SPECIMENS FROM HABITATS WITH DIFFERENTFLOW VELOCITIES", Botanica acta, 111(1), 1998, pp. 42-50

Abstract

Flow velocity has an influence on the hydrodynamic and biomechanical properties, as well as on the morphology and the anatomy of the submerged water moss Fontinalis anti-pyretica Hedw. Cross-sections of the plant stems show two main types of tissues. The strengthening tissue in the outer part is characterized by thick-walled cells with a small lumen, the parenchyma in the centre by thin-walled cells with a large lumen. The specimens from habitats of different flow velocities differ inthe proportions of the strengthening tissue and the branching angle of the leaves. A flow tank with a special sensitive two-component balance inserted into the bottom of the flume was used to measure the hydrodynamic drag, which acts on the plant stems at different flow velocities. The drag forces increase with the length of the plant. Mechanical properties such as elasticity and ultimate strength of the plant stemswere tested in tension. Relating the data to the relative proportionsof the strengthening tissue results in different estimates of Young'smoduli for the strengthening tissue of plants from the different sites. The critical strains to which the stems can be extended are remarkably high. Loading and unloading cycles reveal viscoelastic behaviour of the stem tissues. In the first cycle plastic deformation is also observed, but only to a lesser degree in subsequent cycles.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 09:51:58