Simple Bacteria Offer Clues to the Origins of Photosynthesis
In a broad chemical sense, the opposite of photosynthesis isrespiration. Most of life on this planet (all except in the deepsea vents) depends on the reciprocal photosynthesis-drivenproduction of carbon containing compounds by a series of reducing(adding electrons) chemical reactions carried out by plants andthen the opposite process of oxidative (removing electrons)chemical reactions by animals (and plants, which are capable ofboth photosynthesis and respiration) in which these carboncompounds are broken down to carbon dioxide and water.
What Is Photosynthesis? From Light Energy to Chemical …
Photosynthetic organisms can be divided into two classes:those which produce oxygen and those which do not. Photosyntheticbacteria do not produce oxygen (in fact some of them calledanaerobes cannot tolerate oxygen) and this is considered a moreprimitive type of photosynthesis (in which the hydrogen donor ishydrogen sulfide, lactate or other compounds, but not water).Plants and one type of bacteria (cyanobacteria) do produceoxygen, an evolutionarily more advanced type of photosynthesis(in which the hydrogen donor is water).
Photosynthesis is defined as the formation of carbohydrates inliving plants from water and carbon dioxide (CO2). It is the mostimportant chemical pathway (series of chemical reactions) on ourplanet. Almost all of the biomass on Earth was initially createdby photosynthesis.
Producer Consumers - Food Chain - Kid's Corner
Ray: The article makes it pretty clear that the bacteria stay IN the battery and what goes into your gadgets is electrons. Your gadgets need electrons to run; they couldn’t run on bacteria. All power-generating technology is aimed at getting electrons moving around a circuit; if you use coal, hydro or nuclear to generate electricity, it doesn’t mean there’s coal, water or radiation in your gadgets! Same thing here.
This is because they produce their own food
Really amazing are the innovative ways solar power is put into use. Now a team of scientists working in Sandia National Laboratories is focusing on exploring basic steps to
Dirt-Powered Bacteria Batteries - AENews
Like most eco-friendly and renewable solutions, the MFC created by Harvard scientists uses substances readily available throughout Africa and is expected to provide electricity in remote parts of Africa. In fact, the only non-biodegradable substance used in the bacteria powered battery created by Lebone scientists is probably the 5 pound plastic bucket used to case the battery. Although the amount of energy produced by the bacteria powered battery is far from amazing, it can produce enough power to run a few LED lights and small electronics.
Bacterial Identification Virtual Lab | HHMI BioInteractive
Unfortunately, not all bacteria are electrochemically active and require a substance known as a ‘mediator’ to facilitate the flow of ions. Substances like thionine, methyl viologen, methyl blue, humic acid and neutral red were used as mediators but their toxicity was a major concern for scientists. A few years back scientists engineered electrochemically active bacteria, and the science of bacteria powered batteries took a huge leap forward. Mediator less MFCs can run on everything from waste water to a simple saline solution and are truly environment friendly batteries.
Bacteria are the smallest of all living organisms on Earth
When the chlorophyll molecule is excited by light, the energylevel of an electron in its structure is "boosted to ahigher energy level and this "excited" chlorophyll (nowis called an ) moves rapidly the the reactioncenter of the Photosystem I where it transfers its extra energyto an electron which is then expelled from the reaction centerand is accepted by the first member of a chain of electroncarriers and ultimately reaches NADP+, reducing it to NADPH. Thereaction center has lost an electron and this "electronhole" is filled by by stripping electrons from water whichleaves hydrogen ion (H+) and molecular oxygen (O2). The pathwayof electrons from water to NADP+ has "Z" shape whendiagramed and is refered to as the Z Scheme.