On Monocarpus (Monocarpaceae, Marchantiopsida), an isolated salt-pan complex thalloid liverwort

2015 ◽  
Vol 28 (3) ◽  
pp. 137 ◽  
Author(s):  
Laura L. Forrest ◽  
David G. Long ◽  
D. Christine Cargill ◽  
Michelle L. Hart ◽  
Josephine Milne ◽  
...  
Keyword(s):  
South Africa ◽  
Line Drawing ◽  
Molecular Data ◽  
Morphological Features ◽  
Electron Micrography ◽  
Phylogenetic Placement ◽  
Salt Pan ◽  
Scanning Electron Micrography ◽  
Scanning Electron

The phylogenetic placement of Monocarpus sphaerocarpus D.J.Carr (Monocarpaceae), a member of the complex thalloid liverworts with highly specialised morphology, presumably related to its saltpan habitat, has been determined on the basis of molecular data. Within the complex thalloid liverworts, Monocarpus resolves as sister to the Sphaerocarpales clade. A new line drawing of Monocarpus is provided, as are the first colour photographs of living plants. Detailed ornamentation of the spores of Monocarpus collections from Australia and South Africa, as revealed by scanning electron micrography, is reported, and some of the morphological features that unite and separate Monocarpus and the Sphaerocarpales s.str. are discussed.

scholarly journals The Effect of Tribomechanical Micronization and Activation on Rheological, Thermophysical, and Some Physical Properties of Tapioca Starch

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Zoran Herceg ◽  
Verica Batur ◽  
Anet Režek Jambrak ◽  
Tomislava Vukušić ◽  
Ines Gmajnički ◽  
...  
Keyword(s):  
Particle Size ◽  
Physical Properties ◽  
Laboratory Equipment ◽  
Tapioca Starch ◽  
Electron Micrography ◽  
Swelling Capacity ◽  
Before And After ◽  
Scanning Electron Micrography ◽  
Treatment Changes ◽  
Scanning Electron

The aim of this research was to investigate the effect of tribomechanical treatments on rheological, thermophysical, and some physical properties of tapioca starch. Samples of tapioca starch were treated using laboratory equipment for tribomechanical micronization and activation (TMA equipment). Before and after the TMA treatment, analysis of the particle size and particle size distribution was carried out, in addition to scanning electron micrography in tapioca starch. Scanning electron micrography showed that tribomechanical processing of tapioca starch resulted in breaking accumulations of starch granules in the form of granules. Pasting parameters have shown that maximal viscosities of model starch suspension have been decreasing after tribomechanical treatment. On the basis of gelatinization curves, it can be concluded that there are changes in the gelatinization point after treatment, and there is decrease in enthalpy of gelatinization for model suspension. After tribomechanical treatment, changes in physical properties of starch suspensions were determined, as well as specific swelling capacity, solubility index, and turbidity of tapioca starch suspensions.

Oospore dimensions and wall ornamentation in Chara braunii

Biologia ◽  
2008 ◽  
Vol 63 (4) ◽  
Author(s):  
Patrycja Boszke ◽  
Mariusz Pełechaty ◽  
Andrzej Pukacz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Local Population ◽  
Polar Axis ◽  
Morphological Features ◽  
Cylindrical Shape ◽  
Reproductive Structures ◽  
Equatorial Diameter ◽  
Variable Character ◽  
Scanning Electron

AbstractMorphological features of oospores of a rarely noted species Chara braunii Gmel. were examined in a local population (fishpond near Tuplice village, Ziemia Lubuska region, mid-western Poland). The largest polar axis (LPA, length), largest equatorial diameter (LED, width), isopolarity index (ISI = LPA/LED* 100), and the number of ridges and width of fossa of 90 oospores were measured. Additionally, the oospore wall ornamentation pattern was examined by means of scanning electron microscopy (SEM). As a result, a cylindrical shape and the lack of so-called “shoulder” were found. Oospore length and width ranged between 466.8–600.1 µm and 250.1–366.7 µm, respectively, with the ISI index values between 148 and 213. The number of ridges was 8–10 and the width of fossa varied between 50.0 and 66.7 µm. The oospore width appeared to be the most changeable feature, whereas, by contrast, the number of ridges was the least variable character. Wall ornamentation can be described as tuberculate and a ribbon was present on the ridges. As a comparative material for the study performed, 9 oospores from Professor Izabela Dąmbska’s Collection of Charophytes of Poland were measured. It was evidenced that variation ranges of most of the features of Chara braunii oospores from Tuplice fishpond are similar to those of Professor Dąmbska’s herbarium materials and to data reported by authors from other countries as well. The morphology of reproductive structures does not follow the variation of thalli characteristics.

Stellarioides littoralis (Asparagaceae, Scilloideae), a distinct new species from eastern South Africa

Phytotaxa ◽  
2014 ◽  
Vol 177 (5) ◽  
pp. 261 ◽  
Author(s):  
Neil R. Crouch ◽  
Mario Martínez-Azorín ◽  
Angela J. Beaumont ◽  
David Styles
Keyword(s):  
South Africa ◽  
New Species ◽  
South African ◽  
Endemic Species ◽  
New South ◽  
Morphological Features

A new South African endemic species, Stellarioides littoralis is described and illustrated, with data provided on morphology, ecology and distribution. The species appears to be closely related to S. longibracteata and whilst it shares in common an epigeal habit of the bulb with the latter species, several reproductive and vegetative morphological features clearly distinguish it. The affinities and divergences with other close allies are also discussed.

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