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 Chloroplast shopping experience:
1. Compare - without doubt the biggest advantage that the Chloroplast offers shoppers today is the ability to compare thousands of Chloroplast 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 Chloroplast? Wrong! If the Chloroplast 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 Chloroplast then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Chloroplast? 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 Chloroplast 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 Chloroplast 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 Chloroplast 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 Chloroplast site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Chloroplast, 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 Chloroplast, 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.
Chloroplasts are organelles found in plant cells and
eukaryote algae that conduct photosynthesis. Chloroplasts absorb sunlight and use it in conjunction with water and carbon dioxide to produce sugars, the raw material for energy and
Biomass (ecology) production in all green plants and the animals that depend on them, directly or indirectly, for food. Chloroplasts capture light
energy from the
sun to conserve
Thermodynamic free energy in the form of
Adenosine triphosphate and reduce NADP to
NADPH through a complex set of processes called photosynthesis. It is derived from the Greek words
chloros which means green and
plast which means form or entity. Chloroplasts are members of a class of organelles known as plastids.
Evolutionary origin
Chloroplasts are one of the many unique organelles in the plant cell. They are generally considered to have originated as
endosymbiotic theory cyanobacteria (i.e. blue-green algae). This was first suggested by Mereschkowsky in 1905 after an observation by Schimper in 1883 that chloroplasts closely resemble cyanobacteria. In that they derive from an endosymbiotic event, chloroplasts are similar to
mitochondrion but chloroplasts are found only in
plants and protista. The chloroplast is surrounded by a double-layered composite membrane with an intermembrane space; it has its own DNA and is involved in energy metabolism. Further, it has reticulations, or many infoldings, filling the inner spaces.
In green plants, chloroplasts are surrounded by two cell membranes. The inner membrane is now believed to correspond to the outer membrane of the ancestral cyanobacterium. Chloroplasts have their own genome, which is considerably
genome reduction compared to that of free-living cyanobacteria, but the parts that are still present show clear similarities with the cyanobacterial genome. Plastids may contain 60-100 genes whereas cyanobacteria often contain more than 1500 genes. Many of the missing genes are encoded in the nuclear genome of the host. The transfer of nuclear information has been estimated in
tobacco plants at one
gene for every 16000 pollen grains.
In some algae (such as the heterokonts and other protists such as
Euglenozoa and Cercozoa), chloroplasts seem to have evolved through a secondary event of endosymbiosis, in which a eukaryotic cell engulfed a second eukaryotic cell containing chloroplasts, forming chloroplasts with three or four membrane layers. In some cases, such secondary endosymbionts may have themselves been engulfed by still other eukaryotes, thus forming tertiary endosymbionts.
Structure
Chloroplasts are observable morphologically as flat discs usually 2 to 10 micrometer in diameter and 1 micrometer thick. The chloroplast is contained by an envelope that consists of an inner and an outer phospholipid membrane. Between these two layers is the intermembrane space.
The material within the chloroplast is called the
stroma, corresponding to the cytosol of the original bacterium, and contains one or more molecules of small circular DNA. It also contains
ribosomes, although most of its proteins are encoded by genes contained in the host cell nucleus, with the protein products transported to the chloroplast.
Within the stroma are stacks of thylakoids, the sub-organelles which are the site of photosynthesis. The thylakoids are arranged in stacks called grana (singular: granum). A thylakoid has a flattened disk shape. Inside it is an empty area called the thylakoid space or lumen. Photosynthesis takes place on the thylakoid membrane; as in mitochondrial oxidative phosphorylation, it involves the coupling of cross-membrane
fluxes with biochemistry via the dissipation of a proton electrochemical gradient.
Embedded in the thylakoid membrane is the antenna complex, which consists of proteins, and light-absorbing pigments, including chlorophyll and
carotenoids. This complex both increases the surface area for light capture, and allows capture of photons with a wider range of wavelengths. The energy of the incident photons is absorbed by the pigments and funneled to the reaction centre of this complex through
resonance energy transfer. Two chlorophyll molecules are then ionised, producing an excited electron which then passes onto the photochemical reaction centre.
Transplastomic plants
Recently, chloroplasts have caught attention by developers of
genetically modified plants. In certain plant species, such as tobacco, chloroplasts are not inherited from the male, and therefore, transgenes in these plastids cannot be disseminated by
pollen. This makes
plastid transformation a valuable tool for the creation and cultivation of genetically modified plants that are biologically contained, thus posing significantly lower environmental risks. This
biological containment strategy is therefore suitable for establishing the Co-existence of genetically modified and conventional crops and derived food and feed. The reliability of this mechanism has not yet been studied for all relevant crop species. However, the research programme
Co-Extra recently published results for tobacco plants, demonstrating that the contaiment of transplastomic plants is highly reliable with a tiny failure rate of 3 in 1,000,000.
See also
*
Inner membrane
*
Outer membrane
References
External links
- Chloroplasts and Photosynthesis: The Role of Light from Kimball's Biology Pages
- Chloroplast, Botany
- Use of chloroplast DNA in studying plant phylogeny and evolution
- 3D structures of proteins associated with thylakoid membrane
- Co-Extra research on chloroplast transformation
Chloroplasts are organelles found in
plant cells and eukaryote
algae that conduct
photosynthesis. Chloroplasts absorb sunlight and use it in conjunction with water and carbon dioxide to produce sugars, the raw material for energy and Biomass (ecology) production in all green plants and the animals that depend on them, directly or indirectly, for food. Chloroplasts capture
light energy from the
sun to conserve
Thermodynamic free energy in the form of Adenosine triphosphate and reduce NADP to NADPH through a complex set of processes called photosynthesis. It is derived from the Greek words
chloros which means green and
plast which means form or entity. Chloroplasts are members of a class of organelles known as
plastids.
Evolutionary origin
Chloroplasts are one of the many unique organelles in the plant cell. They are generally considered to have originated as
endosymbiotic theory cyanobacteria (i.e. blue-green algae). This was first suggested by Mereschkowsky in 1905 after an observation by Schimper in 1883 that chloroplasts closely resemble cyanobacteria. In that they derive from an endosymbiotic event, chloroplasts are similar to
mitochondrion but chloroplasts are found only in
plants and
protista. The chloroplast is surrounded by a double-layered composite membrane with an intermembrane space; it has its own
DNA and is involved in energy metabolism. Further, it has reticulations, or many infoldings, filling the inner spaces.
In green plants, chloroplasts are surrounded by two cell membranes. The inner membrane is now believed to correspond to the outer membrane of the ancestral cyanobacterium. Chloroplasts have their own genome, which is considerably genome reduction compared to that of free-living cyanobacteria, but the parts that are still present show clear similarities with the cyanobacterial genome. Plastids may contain 60-100 genes whereas cyanobacteria often contain more than 1500 genes. Many of the missing genes are encoded in the nuclear genome of the host. The transfer of nuclear information has been estimated in
tobacco plants at one gene for every 16000 pollen grains.
In some algae (such as the heterokonts and other protists such as
Euglenozoa and Cercozoa), chloroplasts seem to have evolved through a secondary event of endosymbiosis, in which a eukaryotic cell engulfed a second eukaryotic cell containing chloroplasts, forming chloroplasts with three or four membrane layers. In some cases, such secondary
endosymbionts may have themselves been engulfed by still other eukaryotes, thus forming tertiary endosymbionts.
Structure
Chloroplasts are observable morphologically as flat discs usually 2 to 10 micrometer in diameter and 1 micrometer thick. The chloroplast is contained by an envelope that consists of an inner and an outer phospholipid membrane. Between these two layers is the intermembrane space.
The material within the chloroplast is called the stroma, corresponding to the cytosol of the original bacterium, and contains one or more molecules of small circular DNA. It also contains ribosomes, although most of its proteins are encoded by genes contained in the host cell nucleus, with the protein products transported to the chloroplast.
Within the stroma are stacks of
thylakoids, the sub-organelles which are the site of photosynthesis. The thylakoids are arranged in stacks called
grana (singular: granum). A thylakoid has a flattened disk shape. Inside it is an empty area called the thylakoid space or lumen. Photosynthesis takes place on the thylakoid membrane; as in mitochondrial oxidative phosphorylation, it involves the coupling of cross-membrane
fluxes with biochemistry via the dissipation of a proton electrochemical gradient.
Embedded in the thylakoid membrane is the antenna complex, which consists of proteins, and light-absorbing pigments, including
chlorophyll and
carotenoids. This complex both increases the surface area for light capture, and allows capture of photons with a wider range of wavelengths. The energy of the incident photons is absorbed by the pigments and funneled to the reaction centre of this complex through resonance energy transfer. Two chlorophyll molecules are then ionised, producing an excited electron which then passes onto the photochemical reaction centre.
Transplastomic plants
Recently, chloroplasts have caught attention by developers of genetically modified plants. In certain plant species, such as tobacco, chloroplasts are not inherited from the male, and therefore,
transgenes in these plastids cannot be disseminated by
pollen. This makes
plastid transformation a valuable tool for the creation and cultivation of genetically modified plants that are biologically contained, thus posing significantly lower environmental risks. This
biological containment strategy is therefore suitable for establishing the
Co-existence of genetically modified and conventional crops and derived food and feed. The reliability of this mechanism has not yet been studied for all relevant crop species. However, the research programme Co-Extra recently published results for tobacco plants, demonstrating that the contaiment of transplastomic plants is highly reliable with a tiny failure rate of 3 in 1,000,000.
See also
*Inner membrane
*
Outer membrane
References
External links
- Chloroplasts and Photosynthesis: The Role of Light from Kimball's Biology Pages
- Chloroplast, Botany
- Use of chloroplast DNA in studying plant phylogeny and evolution
- 3D structures of proteins associated with thylakoid membrane
- Co-Extra research on chloroplast transformation
Chloroplast - Wikipedia, the free encyclopedia
Chloroplasts are organelles found in plant cells and eukaryotic algae that conduct photosynthesis. Chloroplasts absorb light and use it in conjunction with water and carbon dioxide ...
chloroplast - definition of chloroplast by the Free Online Dictionary ...
chlo·ro·plast (klôr-pl st, kl r-) also chlo·ro·plas·tid (klôr-pl s t d, kl r-) n. A chlorophyll-containing plastid found in algal and green plant cells.
Chloroplast
Diagram of a plant chloroplast. Notice the bi-layer membrane and the thylakoids.]
Definition: chloroplast from Online Medical Dictionary
The Online Medical Dictionary is a searchable dictionary of definitions from medicine, science and technology.
chloroplast
Structure (organelle) within a plant cell containing the green pigment chlorophyll ... Tiscali Quicklinks. Please visit our Accessibility Page for a list of the Access Keys you can ...
chloroplast - Hutchinson encyclopedia article about chloroplast
Structure (organelle) within a plant cell containing the green pigment chlorophyll. Chloroplasts occur in most cells of green plants that are exposed to light, often in large ...
chloroplast question
The diagram below shows the structure of a chloroplast. a. Name the process that occurs in chloroplasts (1) b : Name the structures labeled.
Biology4Kids.com: Cell Structure: Chloroplasts
That process happens in the chloroplast. Mitochondria work in the opposite direction and break down the sugars and nutrients that the cell receives.
Chloroplast Biogenesis
Chloroplast Biogenesis ... Professor John Gray Professor of Plant Molecular Biology & Head of Department
Chloroplasts
Chloroplasts. A typical plant cell (e.g., in the palisade layer of a leaf) might contain as many as 50 chloroplasts. The chloroplast is made up of 3 types of membrane:
