Related Experiment Video
Updated: Jun 19, 2026
08:44
Fluorescent In Situ Hybridization and 5-Ethynyl-2'-Deoxyuridine Labeling for Stem-Like Cells in the Hydrozoan Jellyfish Cladonema pacificum
Published on: August 3, 2022
THE CELL SAP OF HALICYSTIS
1Laboratories of The Rockefeller Institute for Medical Research.
The Journal of General Physiology
|October 30, 2009
Summary
This study analyzed vacuolar sap from Halicystis cells, revealing a very low potassium to sodium ratio (K:Na) of 0.0114, indicating minimal potassium presence in their natural growth environment.
Area of Science:
- Plant physiology
- Marine biology
- Biochemistry
Background:
- Halicystis is a marine alga known for its large, easily accessible cells.
- Vacuolar sap composition is crucial for understanding cellular ion regulation and turgor pressure.
- Previous studies on stranded Halicystis cells provide a baseline for comparison.
Purpose of the Study:
- To determine the ionic composition of vacuolar sap from Halicystis cells in their natural growth state.
- To compare ion concentrations in situ with those previously reported for isolated cells.
- To establish the potassium to sodium (K:Na) ratio in the vacuolar sap of Halicystis.
Main Methods:
- Collection of over 300 Halicystis cells from their natural growth environment in Bermuda.
- Extraction of 25 cc of vacuolar sap from the collected cells.
- Chemical analysis of the vacuolar sap to determine ion concentrations, specifically potassium and sodium.
Main Results:
- The ionic composition of vacuolar sap from in situ collected Halicystis cells was analyzed.
- Determinations showed close agreement with previous analyses of stranded cells.
- A notably low concentration of potassium was observed, resulting in a K:Na ratio of 0.0114.
Conclusions:
- The vacuolar sap of Halicystis cells in their natural growth state is characterized by a very low potassium content.
- The K:Na ratio in situ is consistent with, and even lower than, that found in isolated cells.
- These findings highlight specific ion regulation mechanisms in Halicystis, adapted to its marine environment.
Related Concept Videos
02:02Responses to Salt Stress
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
01:20Plasmodesmata
In a multicellular organism, cells must communicate to work together in a coordinated manner. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.
Intercellular junctions are a feature of fungal, plant, and animal cells. However, different types of junctions are found in different kinds of cells. Intercellular junctions found in animal cells include tight junctions, gap junctions, and...
Intercellular junctions are a feature of fungal, plant, and animal cells. However, different types of junctions are found in different kinds of cells. Intercellular junctions found in animal cells include tight junctions, gap junctions, and...
02:32Plasmodesmata
The organs in a multicellular organism’s body are made up of tissues formed by cells. To work together cohesively, cells must communicate. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.Intercellular junctions are a feature of fungal, plant, and animal cells alike. However, different types of junctions are found in different kinds of cells. Intercellular junctions found in animal...
01:23Red 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...
01:06Multipotency and Niche of Bulge Stem Cell
A hair follicle or HF is a small part of the skin that produces the hair shaft. Paul Gerson Unna was the first to observe a bulge in the human hair follicle's outer root sheath (ORS). The bulge is present between the sebaceous gland and the arrector pili muscle and is the niche for hair follicle stem cells (HFSCs). The bulge is also a niche for melanocyte stem cells, and their loss results in graying of hair. The HFSCs express Sox9 and Lhx2, which help them maintain stemness and prevent...
00:53Tonicity in Plants
Tonicity describes the capacity of a cell to lose or gain water. It depends on the quantity of solute that does not penetrate the membrane. Tonicity delimits the magnitude and direction of osmosis and results in three possible scenarios that alter the volume of a cell: hypertonicity, hypotonicity, and isotonicity. Due to differences in structure and physiology, tonicity of plant cells is different from that of animal cells in some scenarios.Plants and Hypotonic EnvironmentsUnlike animal cells,...