Influence of ultraviolet radiation on spore liberation in marine macroalgae Ulva fasciata (Ulvales, Chlorophyceae) and Gracilaria corticata (Gracilariales, Rhodophyceae)

Carbohydrates were analysed in 40 species of marine macroalgae belonging to three classes collected at seasonal intervals between April 2018 to March 2019 from the intertidal habitats in Gulf of manner coastal regions.Among the 40 dominant seaweeds 11 species belonged to Chlorophyceae, 13 species to Phaeophyceae and the remaining 16 species to Rhodophyceae. The carbohydrate content of seaweeds varied from 4.50±0.12 to 72.25±3.15 % of DW during the summer season. The percentage of carbohydrate content was maximum in Gracilaria verrucosa (72.25±3.15 % of DW) during the summer season and minimum in Turbinaria ornata (4.50±0.12 DW) during the summer season. The carbohydrate content of seaweeds varied from 5.50±0.17 to 48.38±3.04 % of DW during the pre-monsoon season. The maximum values were observed in Gracilaria corticata var. corticata the minimum content was observed in Padina pavonica. The carbohydrate content of seaweeds varied from 4.83±0.12 to 58.18±4.56 % of DW during the monsoon season. The maximum value was observed in Gracilaria corticata var corticata and the minimum was in Padina pavonica. The carbohydrate content of seaweeds varied from 7.36±0.16 to 67.25±2.41 % of DW during the post-monsoon season. The maximum value was observed in Acanthophora spicifera and the minimum content was observed in Sargassum ilicifolium.

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Effects of ultraviolet radiation on photosynthesis and related enzyme reactions of marine macroalgae

Planta ◽

10.1007/s004250000313 ◽

2000 ◽

Vol 211 (4) ◽

pp. 555-562 ◽

Cited By ~ 112

Author(s):

Kai Bischof ◽

Dieter Hanelt ◽

Christian Wiencke

Keyword(s):

Ultraviolet Radiation ◽

Marine Macroalgae ◽

Enzyme Reactions ◽

Related Enzyme

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Ultraviolet Radiation Affects Emission of Ozone-Depleting Substances by Marine Macroalgae: Results from a Laboratory Incubation Study

Environmental Science & Technology ◽

10.1021/es049527s ◽

2004 ◽

Vol 38 (24) ◽

pp. 6605-6609 ◽

Cited By ~ 32

Author(s):

Frank Laturnus ◽

Teresia Svensson ◽

Christian Wiencke ◽

Gunilla Öberg

Keyword(s):

Ultraviolet Radiation ◽

Marine Macroalgae ◽

Laboratory Incubation ◽

Incubation Study ◽

Ozone Depleting Substances

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Studies on evaluation of surfactant coupled sonication pretreatment on Ulva fasciata (marine macroalgae) for enhanced biohydrogen production

Ultrasonics Sonochemistry ◽

10.1016/j.ultsonch.2021.105853 ◽

2021 ◽

Vol 81 ◽

pp. 105853

Author(s):

A.V. Snehya ◽

M.A. Sundaramahalingam ◽

J. Rajeshbanu ◽

S. Anandan ◽

P. Sivashanmugam

Keyword(s):

Marine Macroalgae ◽

Biohydrogen Production ◽

Ulva Fasciata

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Applications of Photoelectron Microscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100092499 ◽

1976 ◽

Vol 34 ◽

pp. 506-507

Author(s):

William J. Baxter

Keyword(s):

Electron Microscopy ◽

Thermal Decomposition ◽

Chemical Composition ◽

Ultraviolet Radiation ◽

Thin Layer ◽

Edge Effects ◽

Electron Optics ◽

Surface Layers ◽

Crystalline Orientation ◽

Fluorescent Screen

In this form of electron microscopy, photoelectrons emitted from a metal by ultraviolet radiation are accelerated and imaged onto a fluorescent screen by conventional electron optics. image contrast is determined by spatial variations in the intensity of the photoemission. The dominant source of contrast is due to changes in the photoelectric work function, between surfaces of different crystalline orientation, or different chemical composition. Topographical variations produce a relatively weak contrast due to shadowing and edge effects.Since the photoelectrons originate from the surface layers (e.g. ∼5-10 nm for metals), photoelectron microscopy is surface sensitive. Thus to see the microstructure of a metal the thin layer (∼3 nm) of surface oxide must be removed, either by ion bombardment or by thermal decomposition in the vacuum of the microscope.

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