Growth, Survival and Reproduction of Two Species of Marine Algae at Different Densities in Natural Stands

1985 ◽  
Vol 73 (1) ◽  
pp. 199 ◽  
Author(s):  
D. R. Schiel
Keyword(s):  
Marine Algae ◽  
Survival And Reproduction ◽  
Natural Stands

scholarly journals The phaeophyte Hizikia fusiformis extracts suppress rhizoid and blade formation in seaweeds

2017 ◽  
Vol 95 (4) ◽  
pp. 830
Author(s):  
Mehader Getachew ◽  
Paulos Getachew ◽  
Ji-Young Cho ◽  
Jae-Suk Choi ◽  
Yong-Ki Hong
Keyword(s):  
Marine Algae ◽  
Undaria Pinnatifida ◽  
Data Description ◽  
Hizikia Fusiformis ◽  
Blade Length ◽  
Seaweed Extracts ◽  
Survival And Reproduction ◽  
Control Technologies ◽  
Rhizoid Formation ◽  
Blade Production

<p class="MediumGrid2"><strong>Background</strong>: Plants, including marine algae, produce allelochemicals that influence the growth, survival, and reproduction of other organisms.</p><p class="MediumGrid2"><strong>Questions</strong>: To identify natural algicidal or antifouling allelochemicals, we screened 18 common seaweed extracts for suppression of rhizoid and blade production in a convenient <em>Porphyra suborbiculata</em> monospore assay.</p><p class="MediumGrid2"><strong>Species study and data description</strong>: Addition of extract from the most potent phaeophyte, <em>Hizikia fusiformis</em>, suppressed rhizoid formation, rhizoid number, rhizoid length, blade formation, and blade length.</p><p class="MediumGrid2"><strong>Study site and dates</strong>: Seaweed thalli for methanol extraction were collected on the coast of Korea from October 2012 to July 2015.</p><p class="MediumGrid2"><strong>Methods</strong>: Extracts were tested using the <em>P. suborbiculata</em> monospore assay system.</p><p class="MediumGrid2"><strong>Results</strong>: The 50 % suppression doses were 15 <em>µ</em>g ml<sup>-1</sup> for rhizoid formation, 2.4 <em>µ</em>g ml<sup>-1</sup> for rhizoid number, 13 <em>µ</em>g ml<sup>-1</sup> for rhizoid length, 6 <em>µ</em>g ml<sup>-1</sup> for blade formation, and 11 <em>µ</em>g ml<sup>-1</sup> for blade length. The <em>H. fusiformis</em> extract also suppressed rhizoid and blade production in leafy green (<em>Ulva pertusa</em>) and brown (<em>Undaria pinnatifida</em> and <em>Ecklonia cava</em>) seaweed spores, as well as suppressing diatom settlement.</p><p><strong>Conclusions</strong>: The allelochemicals that suppressed or eliminated competing seaweed species may be efficacious for new seaweed control technologies, including the development of antifouling or algicidal agents based on natural products.</p>

John Lloyd Williams (1854–1945): profile of a Snowdonian botanist

2006 ◽  
Vol 33 (1) ◽  
pp. 1-17
Author(s):  
Dewi Jones
Keyword(s):  
Nineteenth Century ◽  
Plant Physiology ◽  
Marine Algae ◽  
Plant Distribution ◽  
The Arctic ◽  
Late Nineteenth Century ◽  
Major Study ◽  
The Subject ◽  
Late Nineteenth

John Lloyd Williams was an authority on the arctic-alpine flora of Snowdonia during the late nineteenth century when plant collecting was at its height, but unlike other botanists and plant collectors he did not fully pursue the fashionable trend of forming a complete herbarium. His diligent plant-hunting in a comparatively little explored part of Snowdonia led to his discovering a new site for the rare Killarney fern (Trichomanes speciosum), a feat which was considered a major achievement at the time. For most part of the nineteenth century plant distribution, classification and forming herbaria, had been paramount in the learning of botany in Britain resulting in little attention being made to other aspects of the subject. However, towards the end of the century many botanists turned their attention to studying plant physiology, a subject which had advanced significantly in German laboratories. Rivalry between botanists working on similar projects became inevitable in the race to be first in print as Lloyd Williams soon realized when undertaking his major study on the cytology of marine algae.

Species composition and distribution of marine macro algae at Co To and Thanh Lan archipelago

2020 ◽  
Vol 20 (3) ◽  
pp. 267-276
Author(s):  
Dam Duc Tien ◽  
Nguyen Thi Mai Anh ◽  
Linh Manh Nguyen ◽  
Pham Thu Hue ◽  
Lawrence Liao
Keyword(s):  
Species Composition ◽  
Littoral Zone ◽  
Marine Algae ◽  
Similarity Coefficient ◽  
Algal Flora ◽  
Average Value ◽  
Site Number ◽  
Species Composition And Distribution ◽  
Total Species ◽  
Macro Algae

This paper exhibites species composition and distribution of marine seaweed at 10 sites of Co To and Thanh Lan islands in May 2019. The studies record 76 species of marine algae in the area, belonging to four divisions: Cyanophytes, Rhodophytes, Ochrophytes and Chlorophytes. Among them, five species are classified into Cyanophytes (comprising 6.6% of total species); thirty-four species into Rhodophytes (44.7%); twenty-one species into Ochrophytes/Phaeophytes (27.6%) and sixteen species into Chlorophytes (21.1%). The species composition of marine seaweeds in Co To and Thanh Lan shows significant differences as follows: 22 species (sites number 4 and 10) to 58 species (site number 2) and the average value is 38.7 species per site. Sørensen similarity coefficient fluctuates from 0.33 (sites number 5 and 10) to 0.84 (sites number 1 and 3) and the average value is 0.53. The current investigations show that four species of twenty-one species are collected in the littoral zone and forty-two species in the sub-littoral zone (in which there are thirteen species distributed in both littoral zone and sub-littoral zone). The algal flora in Co To and Thanh Lan is characterized by subtropics.

Checklist of benthic marine Cyanoprokariota of Chafarinas Islands (Alboran Sea, Western Mediterranean). Catálogo de cianoprocariotas bentónicas marinas de las Islas Chafarinas (Mar de Alborán, Mediterráneo Occidental)

2013 ◽  
Vol 38 ◽  
pp. 182-186 ◽  
Author(s):  
Julio De la Rosa Álamos ◽  
María Altamirano ◽  
Marianela Zanolla
Keyword(s):  
Marine Algae ◽  
Western Mediterranean ◽  
Alboran Sea ◽  
Palabras Clave ◽  
Alborán Sea

Catálogo de cianoprocariotas bentónicas marinas de las Islas Chafarinas (Mar de Alborán, Mediterráneo Occidental) Keywords: Chafarinas Islands, Cyanoprokariota, marine algae, Alboran Sea. Palabras clave: Islas Chafarinas, Cyanoprokariotas, algas marinas, Mar de Alborán.

Structure-Reactivity Relationships on Substrates and Inhibitors of the Lysine Deacylase Sirtuin 2 from Schistosoma Mansoni (SmSirt2)

2019 ◽  
Author(s):  
Daria Monaldi ◽  
Dante Rotili ◽  
Julien Lancelot ◽  
Martin Marek ◽  
Nathalie Wössner ◽  
...  
Keyword(s):  
Schistosoma Mansoni ◽  
Human Cancer ◽  
Egg Laying ◽  
Human Cancer Cells ◽  
Parasite Survival ◽  
Survival And Reproduction ◽  
Emergence Of Resistance ◽  
First Time ◽  
Parasitic Life Cycle

The only drug for treatment of Schistosomiasis is Praziquantel, and the possible emergence of resistance makes research on novel therapeutic agents necessary. Targeting of Schistosoma mansoni epigenetic enzymes, which regulate the parasitic life cycle, emerged as promising approach. Due to the strong effects of human Sirtuin inhibitors on parasite survival and reproduction, Schistosoma sirtuins were postulated as therapeutic targets. In vitro testing of synthetic substrates of S. mansoni Sirtuin 2 (SmSirt2) and kinetic experiments on a myristoylated peptide demonstrated lysine long chain deacylation as an intrinsic SmSirt2 activity for the first time. Focused in vitro screening of the GSK Kinetobox library and structure-activity relationships (SAR) of identified hits, led to the first SmSirt2 inhibitors with activity in the low micromolar range. Several SmSirt2 inhibitors showed potency against both larval schistosomes (viability) and adult worms (pairing, egg laying) in culture without general toxicity to human cancer cells.<br>

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