Related Experiment Video
Updated: Mar 23, 2026

04:20
Author Spotlight: Diatom Testing for Forensic Drowning Examination
Published on: November 10, 2023
3.1K
DNA OF THE MARINE RED ALGA GRIFFITHSIA GLOBULIFERA(1) (2)
1Division of Biological and Medical Sciences, Brown University, Providence, Rhode Island.
Journal of Phycology
|April 8, 2016
Summary
Researchers developed a new method to isolate nuclei from red algae, enabling DNA analysis. Griffithsia globulifera DNA analysis revealed a G-C content of approximately 42% and a novel DNase.
Area of Science:
- Marine Biology
- Molecular Biology
- Biochemistry
Background:
- Red algae (Rhodophyta) possess unique biological characteristics.
- Efficient isolation of algal nuclei is crucial for genetic and molecular studies.
- Limited methods exist for high-purity nuclei isolation from red algae.
Purpose of the Study:
- To establish a reliable method for isolating nuclei from red algae.
- To characterize the DNA of Griffithsia globulifera.
- To identify novel enzymes involved in DNA metabolism in red algae.
Main Methods:
- Development of a nuclei isolation protocol specifically for red algae.
- DNA extraction, purification, and quantification using multiple techniques.
- Analysis of DNA base composition (G-C content).
- Enzyme assays to detect DNase activity.
Main Results:
- Successful isolation and purification of nuclei from Griffithsia globulifera.
- Determination of the G-C content of Griffithsia globulifera DNA as approximately 42%.
- Identification and preliminary characterization of a novel DNase enzyme.
Conclusions:
- The developed method provides a robust approach for red algal nuclei isolation.
- The DNA composition data offers insights into the genome of Griffithsia globulifera.
- The discovery of a new DNase opens avenues for further enzymatic research in red algae.
Related Concept Videos
Red Algae
1.8K
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...
1.8K
Green Algae
1.0K
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...
1.0K
Other Algae
575
The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
575
Overview of Algae
1.4K
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...
1.4K
Non-nuclear Inheritance
23.4K
Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm—such as chloroplasts and mitochondria—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
23.4K
Bacterial Phylum Cyanobacteria
805
Cyanobacteria are a diverse group of oxygenic, phototrophic bacteria that played a pivotal role in converting Earth’s atmosphere from anoxic to oxygen-rich billions of years ago. They exhibit remarkable morphological diversity, ranging from unicellular forms to filamentous types, with cell sizes varying between 0.5 μm and 100 μm. Cyanobacteria are classified into five groups: Chroococcales (unicellular, dividing by binary fission), Pleurocapsales (unicellular, dividing by...
805

