Economic importance of Algae.
Since
from olden days Algae species are intimately
connected
with human beings as a source food, medicine and other uses. Algae are taking
an
active role in human beings.
1.
Primary Producers:
Algae
are the main Oxygen producers in aquatic areas. They are also useful in
decreasing
water
pollution by realizing Oxygen. 10% of photosynthesis is occurred by the algae
in
total
photosynthesis quantity. With these activity algae forms 1.6-15.5 x 10 to the
power
of 11
tones of carbonic material like food.
2.
Algae as food:
Algae
species are used as food in several countries in several forms. Algae species
have
proteins,
vitamins (A, B, C and E), lipids, and minerals. Laminaria species is the important
edible seaweed in Japan and the food item „Kombu‟ is prepared from it.
„Aonori‟
from Monostroma; „Asakusa Nori‟ from Porphyra are prepared in different
countries.
Porphyra has 35% protein, 45% carbohydrates, Vitamins B and C and Niacin.
Nostoc
is used as food material in South America.
3. Algae as fodder for cattle:
Rhodymenia
palmate is used as food for sheeps in Narvey. Laminaria saccharina, Pelvitia,
Ascophyllum,
etc. species are used as food for cattles.
4. Algae as fertilizers:
Blue-green
algae are treated as bio-fertilizers from olden days. Nostoc, Oscillatoria,
Scytonema,
Spirulina, etc. are used as fertilizers to rice fields. All these algae are
fixed the
atmosphere
Nitrogen in to ground. Cultivation of Spirulina is gaining importance as feed
for
fish, poultry and cattle.
5. Algae in Pisi culture:
Sea
algae are used as food for fishes. So they play an important role in Pisi
culture. Some
green-algae,
Diatoms, some blue-green algae are used as food material to fishes. These are
also
making the water clean, by realizing Oxygen.
6. Algae in reclamation of alkaline or
Usar soils:
Our
country has more number of alkaline soils or sterile soils. Blue-green algae
like
Nostoc,
Oscillatoria, Scytonema, Spirulina are modified the soils in to fertile soils.
Because
they fixed Nitrogen in to soil. Nearly they fixed 400 K.g. of Nitrogen per
year.
Soil
erosion is also reduced by these algae.
7. Algea in industry:
Iodine
industry is mainly depended upon algae. Algae belonging to Phaeophyceae, like
Laminaria,
Ecklonia, Eisenia, etc. are used in the industry to prepare Iodine in
industries.
Phyllophora
is used to prepare Iodine in Russia.
8. Alginates:
Alginates
are the salts of alginic acid found in the cell wall of phaeophyceae. Alginates
are
extracted from Fucus, Laminaria, Macrocystis and Ecklonia. Alginates are used
in the
preparation
of flame-proof fibrics, plastics, paints, gauze material in surgical dressing,
soups,
ice creams etc.
9. Agar-Agar:
Agar-agar
is a jelly like substance of great economic value. It is obtained from certain
red
algae
like Gelidium, Graciliaria, and Gigartina. Agar is used as a culture medium for
growing
callus in tissue culture.
10. Carragheen or Carragheenin:
It is
extracted from cell walls of red algae like Chondrus and Gigartina. It is a
polysaccharide
esterfied with sulphate. It is used as emulsifier in pharmaceutical industry
and
also in textile, leather, cosmetics and brewing industries.
11. Diatomite:
Diatoms
deposits at marine and fresh water areas. They are rich with silica. It is
called as
diatomite.
It is used in the preparation of Dynamite in olden days. But now it is used in
different
industries like glass, metal polishing, paints, tooth pasts, soups, etc.
12. Funori:
It is
a type of glue obtained from a red alga Gloipeltis furcata. It is used as an
adhesive as
well
as sizing agent for paper and cloth. Chemically it is similar to agar-agar
except that
there
is no sulphate ester group.
13. Minerals:
The
brown sea weeds popularly called as kelps yield potash, soda, and iodine. Some
sea
weeds
are rich source of iron, zinc, copper, manganese and boron. Bromine is
extracted
from
red algae such as Polysiphonia and Rhodymenia.
14. Antibiotics and Medicines:
Antibiotic
Chlorellin, obtained from Chlorella is effective against a number of pathogenic
bacteria.
Extracts from Cladophora, Lyngbya can kill pathogenic Pseudomonas and
Mycobacterium.
Laminaria is used as one of the modern tools for abortion. Seaweeds
have
beneficial effect on gall bladders, pancreas, kidneys, uterus and thyroid
glands.
15. Role of Algae in Sewage
Disposal:Some species like Chlamydomonas, Scenedesmus,
Chlorella,
Pondorhina, Euridina, etc are living in sewage water. They are mainly useful to
clean
the water by realizing Oxygen. They also modified the carbonate material in the
water
into N, P, K fertilizers.
16. Algae as research material:
In
biological research algae are useful because of their
rapid
growth, brief life span and easy mode of cultivation. Chlorella, Scenedesmus
and
Anacystis
are used in investigations in photosynthesis. Blue-green algae are used in
studies
on nitrogen fixation. Researches in Genetics and Cytology are carried out on
Acetabularia.
17. Algae in Space:
Chlorella
and Synechococcus are finding application in space ships
and
nuclear submarines as oxygen regenerating and food and water recycling
organisms.
Harmful aspects of Algae :
Some
algae species like Microcystis, Lyngbya are develop
water
blooms in water areas. They secrete toxic materials into water. That they
polluted
the
water. The algae, Cephaleuros virescence causes for red rust tea in tea plant.
Some
algae
species are caused for some skin diseases.
Dianophlagellate
is caused for the death of fishes in water.
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