Could Quantum Brain Effects Explain Consciousness?

Plant photosynthesis takes place only in the presence of visible light (400-700 nm).

Quantum Effects Of Photosynthesis Could Improve …

Delocalization directs absorption: The early steps of photosynthesis involve the excitation of reaction centres (RCs) and light-harvesting (LH) units by light. Historically, the electronic coherence across RCs and LH units has been neglected as it does not play a significant role during the relatively slow energy-transfer steps of the primary process. However, we showed that spatially extended but short-lived excitonic delocalization across RC-LH units plays a relevant role in general photosynthetic systems, as it causes a redistribution of direct absorption towards the charge separation unit. We also contributed to the experimental verification of this effect.

Unlike in the case of plant photosynthesis, cyclic photophosphorylation takes place in bacterial photosynthesis, i.e.

How does quantum tunneling work in photosynthesis? - …

A fascinating and powerful result of the quantum effects of the nanoscale is the concept of “tunability” of properties. That is, by changing the size of the particle, a scientist can literally fine-tune a material property of interest (e.g., changing fluorescence color; in turn, the fluorescence color of a particle can be used to identify the particle, and various materials can be “labeled” with fluorescent markers for various purposes). Another potent quantum effect of the nanoscale is known as which is a phenomenon that enables the scanning tunneling microscope and flash memory for computing.

But Dr Turin believes that the way smell molecules wiggle and vibrate is responsible - thanks to the quantum effect called tunnelling.

Like the peeling of an onion, the secrets of photosynthesis are being revealed layer by layer. Early in 2007 a team of Berkeley Lab and UC Berkeley researchers identified quantum mechanical effects as the key to the astonishing ability of photosynthesis to utilize nearly all the photons absorbed by the leaves of green plants. Now a different team has found new evidence that points to a closely packed pigment-protein complex of the photosystem as the key to those quantum mechanical effects.

The energy conversion efficiency for this type of photosynthesis is more fully described in Chapter 5.


Photosynthesis May Rely On Quantum Effect - Slashdot

"The vibrational motions of the protein environments had correlated effects on the transition energies of the pigment molecules, which allowed electronic coherence to be preserved," says Lee. "Given that closely packed pigment-protein complexes are a ubiquitous configuration for efficient energy harvesting and trapping in photosynthetic organisms, the long-range correlated fluctuations indicated by our results are unlikely to be unique."

Quantum effects in the understanding of consciousness

Nanoscale particles are not new in either nature or science. However, the recent leaps in areas such as microscopy have given scientists new tools to understand and take advantage of phenomena that occur naturally when matter is organized at the nanoscale. In essence, these phenomena are based on "quantum effects" and other simple physical effects such as expanded surface area (more on these below). In addition, the fact that a majority of biological processes occur at the nanoscale gives scientists models and templates to imagine and construct new processes that can enhance their work in medicine, imaging, computing, printing, chemical catalysis, materials synthesis, and many other fields. Nanotechnology is not simply working at ever smaller dimensions; rather, working at the nanoscale enables scientists to utilize the unique physical, chemical, mechanical, and optical properties of materials that naturally occur at that scale.

Good quantum vibrations helping photosynthesis | …

The experiment's creators acknowledge that their setup is fairly removed from the typical working arena of a photosynthetic antenna protein—they usually have far more in their environment to interact with, and are not called upon to process only laser light. In fact, they indicate that the long-term quantum coherence depends on the excitation conditions, and having a broad spectrum of light to work with could affect the system in new ways. However, the fact that quantum couplings can exist between these proteins, even over significant distances and at room temperature, suggest that it is actually being used to transmit energy during photosynthesis.

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The researchers modeled a system made up of three molecules exposed to light, mimicking the architecture and molecular components seen in the photosynthetic pigments of plants. This scenario consists of two "donor" molecules that emit electrons after they absorb photons, and an "acceptor" molecule that receives the electrons given off by the donor molecules.