Lisa M. Johnson's research while affiliated with University of Nebraska at Lincoln and other places
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Publications (5)
Extracellular polymeric substance (EPS) secretion was examined in the stalked marine diatom Achnanthes longipes Ag. in defined medium. This common biofouling diatom exhibited an absolute requirement for bromide for stalk production and substratum attachment, whereas elevated iodide concentrations in the growth medium inhibited stalk formation and a...
We describe effect of a pathogen that spread through a dense, rapidly growing, benthic diatom community during two infection periods (February and mid-April 1991) in Sycamore Creek, Arizona. Infected areas appeared as gray rings within a matrix of healthy diatom growth and spread rapidly, eventually covering all benthic substrata and causing algal...
Frustule ultrastructure of Pleurosira laevis (Ehr.) Compère from an epilithon sample collected from the Missouri River was examined using scanning electron microscopy. Valve characteristics were similar to those found by other authors, whereas certain features of the cingulum were new. The cingulum consists primarily of three girdle bands (a valvoc...
Achnanthes longipes Ag. is a marine stalk-forming diatom that grows in dense biofilms. The effects of cell density, temperature, and light on growth and stalk production were examined in the laboratory to determine how they affected the ability of this diatom to form a biofilm. Stalk production abruptly increased when A. longipes was cultured at a...
Citations
... Not a single exception has been recovered among 200 + pennate diatoms in which sexual reproduction has been investigated to date. "Spermatogenesis" described in Pseudo-nitzschia multiseries (Hasle) Hasle (as Nitzschia pungens Grunow f. multiseries Hasle 55,56 ) was most likely an intercellular, flagellated parasite [57][58][59] , as further investigation in this species found sexual processes typical of pennates, with the absence of flagellated cells 60,61 . ...
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... Depending on the species, girdle band formation can occur in different phases during cell cycle, either before or after cytokinesis (Lechner and Becker, 2015). Contrary to valve features, this cingulum has largely been ignored in studies of diatom taxonomy and morphology (Johnson and Rosowski, 1992 (which was not peer-reviewed) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. ...
... Rost et al. [39] found similar trends in Sierra Nevada streams. The stalk of D. geminata is primarily sulphated polysaccharide [40]; therefore, sulphur limitation may inhibit stalk formation as observed in the stalkforming marine diatom Achnanthes longipes C. Agardh [41]. The presence of D. geminata in Norway was associated with a minimum sulphate concentration of 2.5 mg l −1 . ...
... However, as far as we know the nutrient and stalk production relation in marine systems has been investigated only in Licmophora flabellata, and stalk formation in this species was essentially stimulated by high light intensity (233 μmol m À 2 s À 1 ), whereas nutrients or temperature influenced neither growth rates nor stalk formation/length (Ravizza and Hallegraeff, 2015). These results did not match the responses of L. colosalis and other marine and freshwater stalked-diatoms (Lewis et al., 2002;Perkins, 2010;Bothwell and Kilroy, 2011). ...
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... Finally and most importantly, they may cause secondary pollution. Algae-lysing bacteria [9–12], as an important component in aquatic ecosystems, can play an important role in improving the water quality in culture ponds. So far, several studies on algae-lysing bacteria have been reported in the literature, including four aspects of isolation and identification of algae-lysing bacteria and descriptions of the algicidal phenomenon [13–16], exploration of the mode of bacterial lysing [17–20], and isolation and identification of the algae-lysing active substances [12, 21, 22]. ...
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