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Green Algae

Green Algae

Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...

Overview of Algae

Overview of Algae

The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...

Red Algae

Red Algae

Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

Reduction of Alkenes: Catalytic Hydrogenation

Reduction of Alkenes: Catalytic Hydrogenation

Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...

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Cultivation of Green Microalgae in Bubble Column Photobioreactors and an Assay for Neutral Lipids

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Published on: January 7, 2019

Microalgal hydrogen production - A review.

Wanthanee Khetkorn¹, Rajesh P Rastogi², Aran Incharoensakdi³

¹Division of Biology, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathumthani 12110, Thailand.

Bioresource Technology

|August 5, 2017

Summary

Microalgae offer a sustainable source for bio-hydrogen, a clean energy alternative. Genetic engineering and photobioreactor advancements are key to enhancing efficient and cost-effective hydrogen production.

Keywords:

Biofuels Cyanobacteria Hydrogen-production Hydrogenase Microalgae Photobioreactors

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Quantification of Heavy Metals and Other Inorganic Contaminants on the Productivity of Microalgae

Quantification of Heavy Metals and Other Inorganic Contaminants on the Productivity of Microalgae

Published on: July 10, 2015

Area of Science:

Biotechnology
Renewable Energy
Microbiology

Background:

Microalgae and cyanobacteria are explored for bio-hydrogen production, a renewable energy alternative.
Hydrogen-fuel-cell technology offers an eco-friendly energy solution with water as the only byproduct.
Sustainable hydrogen production is crucial for meeting future energy demands.

Purpose of the Study:

To review recent technological advancements in microalgal bio-hydrogen production.
To discuss the role of enzymes and genetic/metabolic engineering in enhancing hydrogen evolution.
To highlight approaches for cost-effective and sustainable hydrogen generation from microalgae.

Main Methods:

Review of current literature on microalgal hydrogen production.
Analysis of genetic and metabolic engineering strategies.
Evaluation of photobioreactor designs for large-scale production.

Main Results:

Genetic and metabolic engineering can significantly improve photobiological hydrogen production.
Modulating key enzymes like hydrogenase and nitrogenase enhances hydrogen evolution.
Development of photobioreactors facilitates large-scale biomass and hydrogen generation.

Conclusions:

Microalgal bio-hydrogen presents a promising renewable energy source.
Engineering approaches are vital for optimizing hydrogen yield and economic viability.
Continued research in photobioreactors and metabolic engineering is essential for sustainable bio-hydrogen.