Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Green Algae shopping experience:
1. Compare - without doubt the biggest advantage that the Green Algae offers shoppers today is the ability to compare thousands of Green Algae at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.
2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about
3. Testimonials - don't know anybody that has bought a Green Algae? Wrong! If the Green Algae is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.
4. Questions - Got a question about Green Algae then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Green Algae? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Green Algae and build up a picture of their reputation for sales, returns, customer service, delivery etc.
6. Returns - still worried that even after all of the above your Green Algae wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.
7. Feedback - happy with your Green Algae then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.
8. Security - check for the yellow padlock on the Green Algae site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Green Algae, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.
10. Payment - ready to pay for your Green Algae, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.
{{Taxobox| color = lightgreen| name = Green algae| image = Green algae.jpg| image_width = 240px| image_caption =| regnum =Protista or Plantae]
Charophyta-->
Green algae are microscopic protists; found in all aquatic environments, including marine, freshwater and brackish water.
The
green algae (singular:
green alga) are the large group of
algae from which the embryophytes (higher plants) emerged. As such, they form a
paraphyletic group, variously included among the Plantae or with the
Protista. The green algae include unicellular and colonial flagellates, usually but not always with two
flagellum per cell, as well as various colonial, coccoid, and filamentous forms. In the
Charales, the closest relatives of higher plants, full differentiation of tissues occurs. There are about 6000 species of green algae. Thomas, D. 2002.
Seaweeds. The Natural History Museum, London. ISBN 0 565 09175 1 Many species live most of their lives as single-cells, other species form colonies or long filaments.
A few other organisms rely on green algae to conduct photosynthesis for them. The chloroplasts in euglenids and
chlorarachniophytes were presumably acquired from ingested green algae, and in the latter retain a vestigial nucleus (nucleomorph). Some species of green algae, particularly of genera
Trebouxia or
Pseudotrebouxia (Trebouxiophyceae), can be found in symbiotic associations with
fungi to form
lichens. In general the fungal species that partner in lichens cannot live on their own, while the algal species is often found living in nature without the fungus.
Cellular structure
Almost all forms have chloroplasts. These contain
chlorophylls
a and
b, giving them a bright green colour (as well as the accessory pigments
beta carotene and
xanthophylls),Burrows 1991.
Seaweeds of the British Isles. Volume
2 Natural History Museum, London. ISBN 0 565 00981 8 and have stacked thylakoids.Hoek, C. van den, Mann, D.G. and Jahns, H.M. 1995.
Algae An introduction to phycology. Cambridge University Press, Cambridge. ISBN 0 521 30419 9
All green algae have mitochondrion with flat cristae. When present, flagellum are typically anchored by a cross-shaped system of microtubules, but these are absent among the higher plants and charophytes. Flagella are used to move the organism. Green algae usually have cell walls containing cellulose, and undergo open mitosis without centrioles.
Origins
The chloroplasts of green algae are bound by a double membrane, so presumably they were acquired by direct
endosymbiotic theory of cyanobacteria. A number of cyanobacteria show similar pigmentation, but this appears to have arisen more than once, and the chloroplasts of green algae are no longer considered closely related to such forms. Instead, the green algae probably share a common origin with the red algae.
Classification
Green algae are often classified with their embryophyte descendants in the green plant clade
Viridiplantae (or Chlorobionta). Viridiplantae, together with red algae and
glaucophyte algae, form the supergroup
Primoplantae, also known as
Archaeplastida or Plantae
sensu lato.
on rock substratum at the ocean shore. Some green seaweeds, such as
Enteromorpha and
Sea lettuce, are quick to utilize inorganic nutrients from land runoff, and thus can be indicators of nutrient pollution.
The orders outside the Chlorophyta are often grouped as the division Charophyta, which is
paraphyletic to higher plants, together comprising the Streptophyta. Sometimes the Charophyta is restricted to the Charales, and a division Gamophyta is introduced for the Zygnematales and Desmidiales. In older systems the Chlorophyta may be taken to include all the green algae, but taken as above they appear to form a monophyletic group.
Reproduction
Green algae are eukaryotic organisms that follow a reproduction cycle called alternation of generations.
Sexual reproduction varies from fusion of identical cells (isogamy) to
fertilisation of a large non-motile cell by a smaller motile one (oogamy). However, these traits show some variation, most notably among the basal green algae, called
prasinophytes.
Haploid algae cells (containing only one copy of their DNA) can fuse with other haploid cells to form diploid zygotes. When filamentous algae do this, they form bridges between cells, and leave empty cell walls behind that can be easily distinguished under the light microscope. This process is called
conjugation.
The species of
Ulva are reproductively isomorphic, the
diploid vegetative phase is the site of
meiosis and releases haploid zoospores which germinate and grow producing a haploid phase alternating with the vegetative phase.
References
External links
- Green algae and cyanobacteria in lichens
- Green algae (UC Berkeley)
See also
{{Taxobox| color = lightgreen| name = Green algae| image = Green algae.jpg| image_width = 240px| image_caption =| regnum =
Protista or
Plantae]
Charophyta-->
Green algae are microscopic protists; found in all aquatic environments, including marine, freshwater and brackish water.
The
green algae (singular:
green alga) are the large group of algae from which the embryophytes (higher plants) emerged. As such, they form a
paraphyletic group, variously included among the
Plantae or with the Protista. The green algae include unicellular and colonial
flagellates, usually but not always with two flagellum per cell, as well as various colonial, coccoid, and filamentous forms. In the Charales, the closest relatives of higher plants, full differentiation of tissues occurs. There are about 6000 species of green algae. Thomas, D. 2002.
Seaweeds. The Natural History Museum, London. ISBN 0 565 09175 1 Many species live most of their lives as single-cells, other species form colonies or long filaments.
A few other organisms rely on green algae to conduct photosynthesis for them. The chloroplasts in
euglenids and
chlorarachniophytes were presumably acquired from ingested green algae, and in the latter retain a vestigial nucleus (nucleomorph). Some species of green algae, particularly of genera
Trebouxia or
Pseudotrebouxia (Trebouxiophyceae), can be found in symbiotic associations with fungi to form
lichens. In general the fungal species that partner in lichens cannot live on their own, while the algal species is often found living in nature without the fungus.
Cellular structure
Almost all forms have chloroplasts. These contain
chlorophylls
a and
b, giving them a bright green colour (as well as the accessory pigments beta carotene and
xanthophylls),Burrows 1991.
Seaweeds of the British Isles. Volume
2 Natural History Museum, London. ISBN 0 565 00981 8 and have stacked
thylakoids.Hoek, C. van den, Mann, D.G. and Jahns, H.M. 1995.
Algae An introduction to phycology. Cambridge University Press, Cambridge. ISBN 0 521 30419 9
All green algae have mitochondrion with flat cristae. When present, flagellum are typically anchored by a cross-shaped system of
microtubules, but these are absent among the higher plants and charophytes. Flagella are used to move the organism. Green algae usually have cell walls containing
cellulose, and undergo open
mitosis without
centrioles.
Origins
The chloroplasts of green algae are bound by a double membrane, so presumably they were acquired by direct endosymbiotic theory of
cyanobacteria. A number of cyanobacteria show similar pigmentation, but this appears to have arisen more than once, and the chloroplasts of green algae are no longer considered closely related to such forms. Instead, the green algae probably share a common origin with the red algae.
Classification
Green algae are often classified with their embryophyte descendants in the green plant
clade Viridiplantae (or Chlorobionta). Viridiplantae, together with red algae and
glaucophyte algae, form the supergroup
Primoplantae, also known as Archaeplastida or Plantae
sensu lato.
on rock substratum at the ocean shore. Some green seaweeds, such as
Enteromorpha and
Sea lettuce, are quick to utilize inorganic nutrients from land runoff, and thus can be indicators of nutrient pollution.
The orders outside the Chlorophyta are often grouped as the division Charophyta, which is paraphyletic to higher plants, together comprising the Streptophyta. Sometimes the Charophyta is restricted to the Charales, and a division Gamophyta is introduced for the Zygnematales and Desmidiales. In older systems the Chlorophyta may be taken to include all the green algae, but taken as above they appear to form a monophyletic group.
Reproduction
Green algae are eukaryotic organisms that follow a reproduction cycle called
alternation of generations.
Sexual reproduction varies from fusion of identical cells (isogamy) to fertilisation of a large non-motile cell by a smaller motile one (oogamy). However, these traits show some variation, most notably among the basal green algae, called prasinophytes.
Haploid algae cells (containing only one copy of their DNA) can fuse with other haploid cells to form diploid zygotes. When filamentous algae do this, they form bridges between cells, and leave empty cell walls behind that can be easily distinguished under the light microscope. This process is called
conjugation.
The species of
Ulva are reproductively isomorphic, the diploid vegetative phase is the site of meiosis and releases haploid zoospores which germinate and grow producing a haploid phase alternating with the vegetative phase.
References
External links
- Green algae and cyanobacteria in lichens
- Green algae (UC Berkeley)
See also
Green Algae
The desmid Netrium digitus has a beautifully folded chloroplast: What are algae? The term 'algae' is used for some lower plants and many, often unrelated groups of microorganisms ...
Green algae - Wikipedia, the free encyclopedia
The green algae (singular: green alga) are the large group of algae from which the embryophytes (higher plants) emerged. [1] As such, they form a paraphyletic group, although the ...
Introduction to the Green Algae
Introduction to the "Green Algae" The "green algae" is the most diverse group of algae, with more than 7000 species growing in a variety of habitats.
Definition: Chlorophyta from Online Medical Dictionary
Green algae -->
Photos of Algae: red algae, green algae, brown algae
This page features photos of algae, including red algae, green algae and brown algae. ... Reference Number: English Name: Scientific Name: Photo Details: Native Region of
Blue-Green Algae (Cyanobacteria) in Inland Waters Assessment and ...
Blue-Green Algae (Cyanobacteria) in Inland Waters Assessment and Control of Risks to Public Health
Wild AFA Blue Green Algae
Wild AFA Klamath Blue Green Algae is the most powerful and concentrated of the green foods. The most complete brain food in the world, Klamath Blue ...
Blue-Green Algae (Cyanobacteria) in Inland Waters: Assessment and ...
Making it work togethe Blue-Green Algae (Cyanobacteria) in Inland Waters: Assessment and Control of Risks to Public Health Compiled by the Scottish Executive Health Department Blue ...
Chlorophyta: Green Algae
Information on the characteristics of this group with details of the life cycle of Chlamydomonas, Spirogyra and Ulva.
Polar Bear's Fur Stained Green With Algae At Japanese zoo | World News ...
p>Three polar bears at a Japanese zoo are looking under the weather after their fur turned green.</p>
