ELECTRON MICROSCOPE OBSERVATIONS ON CHLOROPLASTS OF CULTURED LEATHESIA DIFFORMIS (L.) ARESCH.

1968 ◽  
Vol 10 (1) ◽  
pp. 63-67 ◽  
Author(s):  
Kathleen Cole ◽  
Victor Bourne ◽  
Shu Chang Lin
Keyword(s):  
Electron Microscope ◽  
Brown Algae ◽  
Brown Alga ◽  
Intermediate Region ◽  
Chloroplast Structure ◽  
Ultrastructure Study ◽  
Marine Brown Alga

During an ultrastructure study of cells of both parental field material and cultured sporelings of the marine brown alga Leathesia difformis (Chordariales) it was noted that chloroplasts of the field thalli were typical of those previously reported in other brown algae. However, at least two features of chloroplast structure were unique in many cells of the cultured sporelings: constant three-thylakoid type banding without variation in the number of discs and the formation of extra bands between the regular ones in an intermediate region, resulting in a stack of as many as 40 to 60 long, loosely-associated discs.

Some observations on the fine structure of the marine brown alga Phaeostrophion irregulare

1968 ◽  
Vol 46 (11) ◽  
pp. 1369-1375 ◽  
Author(s):  
Victor L. Bourne ◽  
Kathleen Cole
Keyword(s):  
Fine Structure ◽  
Comparative Studies ◽  
Brown Algae ◽  
Brown Alga ◽  
Structure Study ◽  
Outer Membranes ◽  
Interesting Variation ◽  
Heterogeneous Tissue ◽  
Mature Thallus ◽  
Marine Brown Alga

In a fine-structure study of Phaeostrophion irregulare (Dictyosiphonales) most characteristics of the organelles and their interrelationships were found to be similar to those previously reported for other brown algae. However, there was an interesting variation regarding the pyrenoid and the nucleus–chloroplast association in the macroscopic thallus. The pyrenoid is present in the cells of the sporeling but absent from the thallus which grows directly from it. In addition, there is no evidence of any connection between the outer membranes of the nucleus and the chloroplast in the cells of the blade. The significance of these findings is discussed in relation to the phyletic importance of the pyrenoid and the possible implications of observing a limited number of heterogeneous tissue types, such as spore, sporeling, and mature thallus, in comparative studies.

Effect of the marine brown alga Canistrocarpus cervicornis on promastigote forms of Leishmania (L.) amazonensis

Planta Medica ◽  
2009 ◽  
Vol 75 (09) ◽  
Author(s):  
AO Santos ◽  
EA Britta ◽  
T Ueda-Nakamura ◽  
BP Dias Filho ◽  
EM Bianco ◽  
...  
Keyword(s):  
Brown Alga ◽  
Canistrocarpus Cervicornis ◽  
Marine Brown Alga

scholarly journals Isolation of Guanosine Diphosphate d-Mannuronic Acid from the Marine Brown Alga, Fucus gardneri Silva

1964 ◽  
Vol 239 (3) ◽  
pp. PC944-PC946
Author(s):  
Tsau-Yen Lin ◽  
W.Z. Hassid
Keyword(s):  
Brown Alga ◽  
Guanosine Diphosphate ◽  
Mannuronic Acid ◽  
Marine Brown Alga

scholarly journals Pathway of Alginic Acid Synthesis in the Marine Brown Alga, Fucus gardneri Silva

1966 ◽  
Vol 241 (22) ◽  
pp. 5284-5297
Author(s):  
Tsau-Yen Lin ◽  
W.Z. Hassid
Keyword(s):  
Brown Alga ◽  
Alginic Acid ◽  
Acid Synthesis ◽  
Marine Brown Alga

Meroditerpenoids from the southern Australian marine brown alga Sargassum fallax

2009 ◽  
Vol 70 (2) ◽  
pp. 250-255 ◽  
Author(s):  
Priyanka Reddy ◽  
Sylvia Urban
Keyword(s):  
Brown Alga ◽  
Marine Brown Alga

The Anti-Allergic and Anti-Inflammatory Effects of Phlorotannins from the Edible Brown Algae, Ecklonia sp. and Eisenia sp

2021 ◽  
Vol 16 (12) ◽  
pp. 1934578X2110609
Author(s):  
Yoshimasa Sugiura ◽  
Hirotaka Katsuzaki ◽  
Kunio Imai ◽  
Hideomi Amano
Keyword(s):  
Phenolic Compounds ◽  
Brown Algae ◽  
Brown Alga ◽  
Research Groups ◽  
Terrestrial Plants ◽  
Large Numbers ◽  
Anti Inflammatory

Because the number of people suffering from allergies has significantly increased, improved ways of treating these conditions by medical, pharmaceutical, and dietary means are required. Large numbers of studies on allergy have been conducted, and many anti-allergic compounds have been found. Phenolic compounds from terrestrial plants, including catechins and flavonoids, possess anti-allergic properties. Although polyphenols are present in some brown algae, their anti-allergic activities were not studied in detail before the 1990s. The focus was on the algal polyphenols, collectively called phlorotannins (eg., eckol, 6,6′-bieckol, 8,8′-bieckol, dieckol, and phlorofucofuroeckol-A), and research was conducted to clarify their anti-allergic activities. This review summarizes the anti-allergic effects of phlorotannins isolated from the brown alga, Eisenia nipponica, and related reports by other research groups.

Distribution of Pyrenoids Among Some Brown Algae

1966 ◽  
Vol 1 (4) ◽  
pp. 449-454
Author(s):  
L. V. EVANS
Keyword(s):  
Electron Microscope ◽  
Relative Position ◽  
Brown Algae ◽  
Light Microscope ◽  
The Other ◽  
Taxonomic Character ◽  
The Subject

The distribution of pyrenoids among some orders of the brown algae has been investigated with the electron microscope and a report on their occurrence is given, with particular reference to the results obtained with the light microscope by Simon (1954). Some illustrated detail of the structure of the pyrenoids and of the chromatophores is included. Pyrenoids were found to be present in the representatives examined of the Ectocarpales, Sphacelariales, Scytosiphonales and Dictyosiphonales. Excepting the Sphacelariales, this is in agreement with the results of Simon. Pyrenoids were found to be definitely absent in all members of the Dictyotales and Laminariales examined, and disagreement is expressed with Bouck (1965) who reported their presence in Chorda filum, a member of the latter order. The situation in the Fucales is the subject of another communication elsewhere. The presence or absence of pyrenoids is regarded as an additional taxonomic character of possible phyletic use when more is known. The results are discussed from the standpoint of their possible value in assessing the relative position of the Phaeophyceae as a whole. Brown algal lamellations are composed of three, or occasionally four, parallel thylakoids which do not cohere and are not aggregated into stacks. This is thought to be more primitive than the condition in some of the other groups of the Chromophyta where there is adherence of thylakoids into stacks of two or three members as, for example, in the Haptophyceae, Xanthophyceae and Chrysophyceae. The Phaeophyceae are, however, regarded as much less primitive than the Rhodophyceae, where the widely spaced parallel thylakoids are arranged singly.

scholarly journals Natural Compounds from the Marine Brown Alga Caulocystis cephalornithos with Potent In Vitro-Activity against the Parasitic Nematode Haemonchus contortus

Pathogens ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 550
Author(s):  
Aya C. Taki ◽  
Robert Brkljača ◽  
Tao Wang ◽  
Anson V. Koehler ◽  
Guangxu Ma ◽  
...  
Keyword(s):  
Haemonchus Contortus ◽  
Brown Alga ◽  
Parasitic Nematode ◽  
Anthelmintic Activity ◽  
Adult Males ◽  
Terrestrial Plants ◽  
Third Stage ◽  
Future Work ◽  
Marine Brown Alga

Eight secondary metabolites (1 to 8) were isolated from a marine sponge, a marine alga and three terrestrial plants collected in Australia and subsequently chemically characterised. Here, these natural product-derived compounds were screened for in vitro-anthelmintic activity against the larvae and adult stages of Haemonchus contortus (barber’s pole worm)—a highly pathogenic parasitic nematode of ruminants. Using an optimised, whole-organism screening system, compounds were tested on exsheathed third-stage larvae (xL3s) and fourth-stage larvae (L4s). Anthelmintic activity was initially evaluated on these stages based on the inhibition of motility, development and/or changes in morphology (phenotype). We identified two compounds, 6-undecylsalicylic acid (3) and 6-tridecylsalicylic acid (4) isolated from the marine brown alga, Caulocystis cephalornithos, with inhibitory effects on xL3 and L4 motility and larval development, and the induction of a “skinny-straight” phenotype. Subsequent testing showed that these two compounds had an acute nematocidal effect (within 1–12 h) on adult males and females of H. contortus. Ultrastructural analysis of adult worms treated with compound 4 revealed significant damage to subcuticular musculature and associated tissues and cellular organelles including mitochondria. In conclusion, the present study has discovered two algal compounds possessing acute anthelmintic effects and with potential for hit-to-lead progression. Future work should focus on undertaking a structure-activity relationship study and on elucidating the mode(s) of action of optimised compounds.

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