A Role for a Light-Harvesting Antenna Complex ..

AB - Photosystem I is one of the most fascinating membrane protein complexes for which a structure has been determined. It functions as a bio-solar energy converter, catalyzing one of the first steps of oxygenic photosynthesis. It captures the light of the sun by means of a large antenna system, consisting of chlorophylls and carotenoids, and transfers the energy to the center of the complex, driving the transmembrane electron transfer from plastoquinone to ferredoxin. Cyanobacterial Photosystem I is a trimer consisting of 36 proteins to which 381 cofactors are non-covalently attached. This review discusses the complex function of Photosystem I based on the structure of the complex at 2.5 Å resolution as well as spectroscopic and biochemical data.

Quantum transport in the FMO photosynthetic light-harvesting complex

Falkowski PG and Raven JA (1997) Aquatic Photosynthesis. Oxford: Blackwell Scientific Press.

This light is harvested by an antenna-complex, ..

The course explores the physiological processes pertinent to plants, it enhance the knowledge of the students in biological molecules, photosynthesis, respiration, transport, growth, flowering plant, growth substances and the physiological aspects of crop yield. The practical aspect of the course focuses on carrying out simple tests to identify some of the common biochemicals (qualitative analysis) in plants and to measure their amounts (quantitative analysis), to practically study and be able to explain the different physiological activities necessary for growth and development of plants. Determine the underlining physiological activities that explain the characteristics of plant materials observed when still attached onto the parent plant, after harvesting and during storage. The understanding of the rationale behind the practical procedures will enhance the student’s ability to design their own procedures if necessary as they advance to higher levels

A Role for a Light-Harvesting Antenna Complex of ..

Course deals with a variety of physiological processes occurring in plants. For most students this course will serve as background for other more advanced plant science courses. Thus, the following specific objectives are intended To understand plant structures in the context of physiological function plants, To understand plant water relations, i.e. how plants acquire, utilize, and regulate the flow ofwater between plant and environment, To understand the mineral nutrients plants require, and how they are obtained, metabolized,and transported, To understand the physiological details of photosynthesis and respiration, and how they areorganized and regulated in plants, To understand plant growth and development, and its regulation by hormones and theenvironment.

Gest H (1988) Sun‐beams, cucumbers, and purple bacteria. Photosynthesis Research 19: 287–308.
Both these photosystems have their own centers, where the reaction or processing of the photosynthesis takes place.

The antenna complex pigment can ..

Photosynthetic organisms create order by transfomring the otherwise destructive energy of the sun into chemical bond energy.
Energy is needed for doing work
CAM photosynthesis
(Crassulacean Acid Metabolism)

Photosynthetic events are separated by time
All events happen in the mesophyll cells
PEP Carboxylase is the main enzyme for initial CO2 fixation

"Temporal" (time) Separation
mesophyll cell
night
day
CO2 is first converted into a 4-carbon molecule by the enzyme PEP Carboxylase
C4 Photosynthesis
Spatial Separation
Photosynthetic events are separated spatially.

Co2 is first fixed in mesophyll cells by the enzyme PEP Carboxylase and converted to a 4 carbon molecule called malate.

This 4 carbon molecule (malate) is shuttled to the bundle sheath cells, where it enters the Calvin Benson (C3) cycle.
C4 and CAM overcome the tendency of the enzyme RuBisCO to wastefully fix oxygen rather than carbon dioxide in what is called photorespiration.

Algal photosynthesis is thought to increase with increase in nutrient, that is, N, P and Fe availability.

of the complexes be seen and the position of the photosynthesis co ..

Most other organisms need O2 and produce CO2 (as a byproduct of respiration)
Photosynthesis: Who's doing it?
Green Algae
Heliobacteria
Cyanobacteria
Flowering plants = angiosperms

Conifers = gymnosperms
Bryophytes (mosses, liverworts, and hornworts)
Ferns
Purple photosynthetic bacteria
Asian hornet???
back to the question...
but, why do you eat?
Energy and matter transformation
within biological systems
Living things need energy for growth, reproduction, movement, response(s) to stimulii, homestasis, etc.

This energy comes from the chemical energy stored in the high energy carbon-carbon bonds of organic molecules, such as: glucose, cellulose, and lignin

Photosynthesis the process that captures light energy from the sun and converts it into chemical energy stored in plant sugars such as glucose
Once energy is stored in chemical bonds, organisms can "combust" this energy by oxidizing organic molecules (such as glucose) and generating ATP.

Ultimately, cellular respiration uses the energy stored in the chemical bonds of sugars, amino acids, and fatty acids, to generate ATP.

General scheme of algal photosynthesis showing the separation of the electron transport chain and the Calvin Cycle.

reaction center in the antenna complex

Introduction to nanotechnology, the size of things, history of nanotechnology, fabrication methods - top-down and bottoms-up, emerging applications of nanotechnology; Physics at the nanoscale, review of electrodynamics, overview of quantum mechanics and statistical mechanics, electrons and photons, wave-particle duality, electron in potential wells, tunneling, scattering of electrons and photons; Semi-classical treatment of light-matter interactions, Electron transport at the nanoscale - Moore’s law and device size scaling, fundamental limits of CMOS technology, field effect transistors, conventional MOSFET, ballistic FETs, FinFETs, single electron transistors, quantum dots photonics at the nanoscale, diffraction limit of light, optoelectronic integration, photonic crystals, surface plasmons, metamaterials, nanoantenna and optical circuits, enhanced light-matter interaction with nanoantennae; applications in sensors, energy harvesting, information processing, quantum computing.