Month: September 2022

ONE AND TWO PLANES. "When restricted to one plane or orientation, unbranched filaments can be formed (e.g. Spirogyra); when confined to two orientations, cell division can give rise to branched filamentous, monostromatic, or pseudo-parenchymatous tissue constructions (e.g. Stigeoclonium, Volvox and Ralfsia, respectively)." http://aob.oxfordjournals.org/content/85/4/411.full.pdf View in LinkedIn

THREE PLANES. "When cell division occurs in all three planes, a multicellular body layout is possible, which can simultaneously manifest a filamentous and parenchymatous construction (e.g. Fritschiella)." http://aob.oxfordjournals.org/content/85/4/411.full.pdf View in LinkedIn

MULTIPLICITY FROM SIMPLICITY. "Since each of these three multicellular variants can involve diffuse, trichothallic, intercalary, or apical cell divisions, or some combination of all four, a large number of multi-cellular body plan variants can be codified (i.e. 3 cell division planes, 5 meristematic locations, 15 variants de minimis), although the usefulness of doing so is questionable." http://aob.oxfordjournals.org/content/85/4/411.full.pdf View in LinkedIn

BODY PLAN IRRELEVANT. "Although a number of growing point (meristematic) characteristics collectively influence whether a variety of morphological and anatomical features are achieved in a particular body part or plan (e.g. the duration of activity and the number of cells involved at each location, as well as the extent to which cells, tissues or organs differentiate or differ in symmetry, number, etc.), none of these features is considered here to be especially relevant to the fundamental distinctions that can be drawn among the four basic plant body plans." http://aob.oxfordjournals.org/content/85/4/411.full.pdf View in LinkedIn

CONVERGED OR DIVERSIFIED. "This body plan classification scheme draws sharp attention to the extent to which body plans have diversified within or converged among the various plant lineages and how they have become confined in number in evolutionarily more derived groups." http://aob.oxfordjournals.org/content/85/4/411.full.pdf View in LinkedIn

SO ENDS this two weekend indulgence in the topic of plant body plan evolution. For younger readers, it is a glimpse into the thought life of botanists who are concerned with these issues, and whose life revolves around figuring out how they came about; it is a rate chance, from the comfort of your own chair, to walk in the shoes of another person in an intellectually intimate way. This is true for all these postings, in their different disciplines. View in LinkedIn

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MAGNETIC BACTERIA. “The molecular mechanism of magnetite synthesis in magnetotactic bacteria is a complex, multistep process, which includes magnetosome vesicle formation, iron transport and magnetite crystallization.” https://lnkd.in/es5DATt View in LinkedIn

MAGNETITE. “The existence of magnetite crystal chains, which lead to a magnetically oriented swimming behavior in so-called “magnetotactic bacteria”, unequivocally proves that living cells can, in principle, synthesize magnetite that will align with the geomagnetic field. However, the magnetite crystals in these bacteria are not part of an active sensory system; they only lead to passive alignment.” https://lnkd.in/eUbuD-a View in LinkedIn

MICE. “We demonstrated magnetoreception in wood mice and provide first evidence for a radical-pair mechanism in a mammal.” http://www.nature.com/articles/srep09917 View in LinkedIn