Vascular plants have lignified tissue and specialized structures termed xylem and phloem, which transport water, minerals, and nutrients upward from the roots and return sugars and
other photosynthetic products.
Given at least nine meters (roughly 30 feet) of water on the planet, photosynthetic microbes (including mats of algae, cyanobacteria, and
other photosynthetic bacteria) and plant - like protoctists (such as floating seaweed or kelp forests attached to the seafloor) could be protected from «planet - scalding» ultraviolet flares produced by young red dwarf stars, according to Victoria Meadows of Caltech, principal investigator at the NASA Astrobiology Institute's Virtual Planetary Laboratory.
Other bacteria use bacteriochlorophyll and
other photosynthetic proteins to convert light to metabolic energy.
They are designing an artificial system that mimics how plants and
other photosynthetic organisms use sunlight to convert CO2 and water into molecules that humans can later use for fuel.
Not exact matches
That is, oxygen tends to fall out of the air as rust and
other mineral oxides rather than linger as a gas, so when it exists in abundance, something —
photosynthetic life, in Earth's case — must be constantly replenishing it.
Huang teamed up with
other researchers to do microfluidics experiments, growing bacteria in tiny chambers and tracking individual cells to learn how
photosynthetic bacteria grow in light and dark.
Since these physiological features are shared by both Pereskia groups as well as
other cacti, despite their ancient evolutionary split, the team concludes that they must have evolved first, and that the first cacti were «shrubs or small trees with
photosynthetic leaves.»
Photosynthetic chromatophores are bubbles of liquid that form on the membranes of bacteria that harness sunlight, carbon dioxide and water to produce the energy needed for respiration and
other functions.
Venter and
other scientists are experimenting with
photosynthetic microbes such as algae and cyanobacteria (sometimes referred to as blue - green algae).
The best studied belongs to
photosynthetic cyanobacteria:
other microbes, like E. coli, don't carry clocks at all, says Pamela Silver at Harvard.
Dr. Worden says her collaborators are interested in understanding the origins of
photosynthetic life, in part because it played a crucial role in allowing
other life forms, including humans, to exist.
«The work provides the first quantitative, physiological, and phylogenetic framework for understanding why, when, and how angiosperms evolved much higher
photosynthetic rates than
other plants.»
«Our lab and
others have put a gene from cyanobacteria into crop plants and found that it boosts the
photosynthetic rate by 30 percent,» he said.
Photosynthetic microbes offer
other clues to improving photosynthesis in plants, the researchers report.
Millet is a so - called C4 plant, which has a very efficient
photosynthetic system for capturing carbon dioxide, whereas most
other plants that grow in northern China are less efficient C3 plants.
But these
photosynthetic organisms activate
other biochemical pathways at night, when they generate energy by breaking down the sugars, starches, and oils that they created during the day.
Currently, the method is being used to assess the optical properties of
photosynthetic antenna proteins in various states of assembly, and to measure
other protein - protein interactions at the single - molecule level.
To determine if the so - called vent glow can sustain
photosynthetic life, Cindy Van Dover, a marine biologist at the College of William and Mary in Williamsburg, Virginia, formed a research team that included Thomas Beatty, a microbiologist at the University of British Columbia in Vancouver, Canada, Robert Blankenship, a biochemist at Arizona State University in Tempe, and
others.
«This suggests that the light use efficiency of lettuce and pothos was limited by a process
other than conversion into heat, likely light - induced damage to the
photosynthetic machinery in the leaves,» the authors noted.
Researchers have found the first
photosynthetic organism that lives off a light source
other than the sun.
Subsequently, some aerobic (or oxygen - breathing) protists merged with
photosynthetic bacteria, which became chloroplasts and
other plastids, to create free - swimming green algae and the precursors of today's plant cells.
On the
other hand, many anaerobic microbes including methanogens are easily poisoned by oxygen, and the recent discovery of banded sediments with rusted iron on Akilia Island in West Greenland suggests that oxygen - producing,
photosynthetic microbes (e.g., cyanobacteria) living on the surface of wet areas to gather sunlight may have developed by the end of this geologic period (3.85 billion years ago) despite continuing bombardment from space.
1972 Andrew Alm Benson for his discovery of ribulose among products of
photosynthetic carbon dioxide assimilation and for his
other contributions to the elucidation of this process
These mats are likely composed of, among
other bacteria, Chloroflexus, a filamentous
photosynthetic microbe (yes, it produces energy from sunlight like plants do!)
I think there are several
other ways to move closer to an aquatic
photosynthetic sources for your EPA and DHA, that may even allow you to avoid fish oil altogether.
Various forms of parasitism are also fairly common among plants, from the semi-parasitic mistletoe that merely extracts nutrients from its host, but also has
photosynthetic capability, to the fully parasitic toothwort that acquire all their nutrients through conduits to the roots of
other plants.
But seriously — figure the amount of iron, and nitrogen, and — quite literally — all the
other trace elements released into the
photosynthetic zone by whales, since the whales have to surface to breathe.
Re posts 8 & 3: I think only
photosynthetic organisms gain a direct benefit from higher CO2, and fishes are certain not to benefit (although some fish species may be less sensitive to HCO3 than
others and receive an indirect benefit via ecological interactions).
On the
other hand, as we have written frequently, solar energy is perhaps better captured using a technique involving an artificial leaf or
photosynthetic stage.
For this reason, the fact that
photosynthetic processes make water more basic, and
other equilibrium considerations, acidification of the oceans is not a hazard.
This scenario is, among
other sources, inspired by the work of scientists Debora MacKenzie and Michael Le Page who wrote about
photosynthetic creatures, or what they call «plantimals» in the New Scientist (2010).
Dr. Kiang also relates this work to research in astrobiology, particularly with regard to how
photosynthetic activity produces signs of life at the global scale (e.g., biogenic gases like oxygen and
photosynthetic pigments like chlorophyll) and how these may exhibit adaptations to alternative environments on extrasolar planets, resulting in
other «biosignatures» that might be detected by space telescopes.
Simulations aim to understand how different irradiance spectra affect a planet's habitability and climate dynamics and its radiance signature, due to the spectral absorbance properties of different atmospheres and different surface spectral albedos resulting from the gradual spread of life over land and adaptations of
photosynthetic pigments to
other light regimes.