scholarly journals A COMPARATIVE STUDY OF PERMEABILITY IN PLANTS

1919 ◽  
Vol 1 (3) ◽  
pp. 299-304 ◽  
Author(s):  
W. J. V. Osterhout
Keyword(s):  
Comparative Study ◽  
Green Alga ◽  
Brown Alga ◽  
Red Alga ◽  
Flowering Plant ◽  
Quantitative Studies

Quantitative studies on Laminaria (a brown alga), Ulva (a green alga), Rhodymenia (a red alga), and Zostera (a flowering plant) show that the behavior of these plants, in respect to changes in permeability, is essentially alike in all cases.

Comparative study of aluminum and copper transport and toxicity in an acid-tolerant freshwater green alga

1986 ◽  
Vol 20 (6) ◽  
pp. 616-620 ◽  
Author(s):  
Brian R. Folsom ◽  
Nicolae Andrei. Popescu ◽  
John M. Wood
Keyword(s):  
Comparative Study ◽  
Green Alga ◽  
Copper Transport ◽  
Acid Tolerant

scholarly journals A new threat to local marine biodiversity: filamentous mats proliferating at mesophotic depths off Rapa Nui

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12052
Author(s):  
Javier Sellanes ◽  
Matthias Gorny ◽  
Germán Zapata-Hernández ◽  
Gonzalo Alvarez ◽  
Praxedes Muñoz ◽  
...  
Keyword(s):  
Green Alga ◽  
Brown Alga ◽  
Easter Island ◽  
Marine Biodiversity ◽  
Filamentous Cyanobacteria ◽  
Rapa Nui ◽  
Remotely Operated Vehicle ◽  
Morphologic Analysis ◽  
Western Side

Mesophotic and deeper habitats (∼40 to 350 m in depth) around Rapa Nui (Easter Island) were investigated using a remotely operated vehicle. We observed extensive fields of filamentous cyanobacteria-like mats covering sandy substrates and mostly dead mesophotic Leptoseris spp. reefs. These mats covered up to 100% of the seafloor off Hanga Roa, the main village on the island, located on its western side. The highest mortality of corals was observed at depths between 70 and 95 m in this area. Healthy Leptoseris reefs were documented off the northern and southeastern sides of the island, which are also the least populated. A preliminary morphologic analysis of samples of the mats indicated that the assemblage is composed of at least four filamentous taxa, including two cyanobacteria (cf. Lyngbya sp. and Pseudoanabaena sp.), a brown alga (Ectocarpus sp.), and a green alga (Cladophora sp.). An ongoing eutrophication process is suggested as a potential driver of the proliferation of these filamentous mats off Hanga Roa village.

Rediscovery of the sponge crab Cryptodromia fallax (Latreille in Milbert, 1812) (Decapoda: Brachyura: Dromiidae) at Mauritius, with the description of a new genus and the confirmation of an unusual seaweed-carrying camouflage mode

2019 ◽  
Vol 40 (1) ◽  
pp. 82-88
Author(s):  
Colin L McLay
Keyword(s):  
Green Alga ◽  
Brown Alga ◽  
New Genus ◽  
Ulva Lactuca ◽  
Lobophora Variegata ◽  
New Information ◽  
Structural Differences ◽  
New Material

Abstract Cryptodromia fallax (Latreille in Milbert, 1812) has been serendipitously found again on the island of Mauritius, almost 200 yrs after its discovery. The new material provides new information about the structure of the female sternum, providing stronger evidence that a new genus, Alcockdromiagen. nov., is required. Observations show that this crab cuts out and carries pieces of seaweed in the manner of a paraglider, rather than pieces of sponge normally carried by dromiid crabs. The crab uses Ulva lactuca Linnaeus, a green alga, and Lobophora variegata (J.V. Lamouroux), a brown alga. This discovery shows that the last two prehensile dromiid pereopods, which are used to carry soft camouflage, are multi-purpose, having only minor structural differences allowing them to carry seaweeds.

THE EFFECT OF EXTREME SHADE UPON LEAF FORM AND STRUCTURE IN VICIA AMERICANA

1955 ◽  
Vol 33 (4) ◽  
pp. 293-297 ◽  
Author(s):  
R. G. H. Cormack
Keyword(s):  
Comparative Study ◽  
Internal Structure ◽  
Flowering Plant ◽  
Mesophyll Cells ◽  
Leaf Form

A comparative study of light and shade leaflets of a common flowering plant (Vicia americana) reveals striking differences in leaflet form, size, thickness, and internal structure. The marked thinness of shade leaflets is due to the failure of the mesophyll cells to enlarge, and their peculiar folded form is attributed to the same cause.

scholarly journals Sterol composition of the Adriatic sea algae Ulva lactuca, Codium dichotomum, Cystoseira adriatica and Fucus virsoides

2005 ◽  
Vol 70 (12) ◽  
pp. 1395-1400 ◽  
Author(s):  
Radomir Kapetanovic ◽  
Dusan Sladic ◽  
Simeon Popov ◽  
Mario Zlatovic ◽  
Zoran Kljajic ◽  
...  
Keyword(s):  
Green Algae ◽  
Green Alga ◽  
Brown Algae ◽  
Brown Alga ◽  
Adriatic Sea ◽  
Sterol Composition ◽  
Ulva Lactuca ◽  
The South ◽  
Low Concentration

The sterol composition of two green algae and two brown algae from the South Adriatic was determined. In the green alga Ulva lactuca, the principal sterols were cholesterol and isofucosterol. In the brown alga Cystoseira adriatica, the main sterols were cholesterol and stigmast-5-en-3?-ol, while the characteristic sterol of the brown algae, fucosterol, was found only in low concentration. The sterol fractions of the green alga Codium dichotomum and the brown alga Fucus virsoides contained practically only one sterol each, comprising more than 90 % of the total sterols (clerosterol in the former and fucosterol in the latter).

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