منابع مشابه
Lichens
What are lichens? The term lichen refers to a symbiotic association between a filamentous fungus, the ‘mycobiont’, and at least one photosynthetic organism, the ‘photobiont’, consisting of a micro alga, a cyanobacterium, or both (Figure 1). Although the symbiotic nature of lichens was first revealed in 1867, the development of a lichen thallus is often so integrated (Figure 1D) that they have b...
متن کاملPhysiology of parturition
Labor is a physiological event involving a sequential, integrated set of changes within the myometrium, deciduas, and uterine cervix that occur gradually over a period of days to weeks. Biochemical connective tissue changes in the uterine cervix appear to precede uterine contractions and cervical dilation, and all of these events usually occur before rupture of the fetal membranes. In other wor...
متن کاملLichens survive in space: results from the 2005 LICHENS experiment.
This experiment was aimed at establishing, for the first time, the survival capability of lichens exposed to space conditions. In particular, the damaging effect of various wavelengths of extraterrestrial solar UV radiation was studied. The lichens used were the bipolar species Rhizocarpon geographicum and Xanthoria elegans, which were collected above 2000 m in the mountains of central Spain an...
متن کاملPhytase activity in lichens
Phytase activity was investigated in 13 lichen species using a novel assay method. The work tested the hypothesis that phytase is a component of the suite of surface-bound lichen enzymes that hydrolyse simple organic forms of phosphorus (P) and nitrogen (N) deposited onto the thallus surface. Hydrolysis of inositol hexaphosphate (InsP6 , the substrate for phytase) and appearance of lower-order ...
متن کاملLichens: Mysterious and Diverse
The science of lichenology, or the study of lichens, has lagged behind other branches of botany, and many aspects of lichen biology are still shrouded with mystery. In fact, the most mysterious aspect of these plants, and the one basic to understanding them, was not known until the relatively late date of 1867: that although outwardly lichens appear to be discrete organisms, they are in fact ma...
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ژورنال
عنوان ژورنال: Botanical Gazette
سال: 1912
ISSN: 0006-8071
DOI: 10.1086/330961