نتایج جستجو برای: water fern
تعداد نتایج: 553064 فیلتر نتایج به سال:
The maintenance of genetic diversity and stochastic losses of diversity during periods of small population size have become major points of concern in conservation biology. However, empirical research on random evolutionary processes in natural plant populations is still scarce and is reviewed here in comparison to our case study on Dryopteris cristata. Detailed recent population histories of t...
The species Coniopteris laciniata and Sphenopteris wonnacottii are heterophyllous ferns recovered from two Spanish Barremian localities, Las Hoyas El Montsec respectively. similarities between these species, observed in a study of total 66 hand specimens both indicate that they conspecific. Following the rule priority botanical nomenclature, because there doubts about assignment this to higher ...
This paper investigates the elimination of drugs of abuse from six different chemical classes and their metabolites in natural fluvial waters (nearby the output of a sewage system). Mineralization of these substances and toxicological characterization before and after treatment by a heterogeneous photo-Fenton system has been evaluated. This advanced oxidation technology was able to significantl...
Axonemes from the heterosporous water fern Marsilea vestita were fixed in the presence of tannic acid and examined by thin-section electron microscopy. Transverse sections revealed the normal 9+2 configuration except for the absence of the outer of the two dynein arms. Both arms were normally preserved in parallel preparations of Chlamydomonas axonemes. Isolated dynein from the ciliated protozo...
The mesophyll anatomical traits are essential factors for efficient light capture, CO2 diffusion, and hydraulics in leaves. At the same time, leaf governed by xylem traits. Thus, simultaneous analyses of anatomy will clarify links among water use. However, such have been scarcely performed, particularly on non-seed plants. Using seven fern species, we first showed that species with a large thic...
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