Photosystem I is located in the membrane of cyanobacteria and plants. It contains proteins, chlorophylls, carotenoids, and other cofactors that transfer electrons during photosynthesis. PsaA and PsaB form the core where primary electron transfer occurs. Electrons are transferred from P700 to ferredoxin via a chain containing chlorophyll, phylloquinone, and iron-sulfur clusters. Ferredoxin then transfers electrons to ferredoxin-NADP+ reductase to reduce NADP+ to NADPH, providing energy for the Calvin cycle.
In this ppt, you will learn about photosystem first of photosynthesis, with video and animation such a nice presentation. electron movement by animation, see and understand the system.
Photosynthesis overview
A. Purpose
B. Location
The light vs. the “dark” reaction
Chloroplasts pigments
A. Light absorption
B. Types
Light reactions
A. Photosystems
B. Photophosphorylation
V. The light independent reaction (“dark” reaction)
A. Carbon “fixation”
B. Reduction
C. Regeneration
VI. Alternative plants
B.Sc Micro II Microbial physiology Unit 2 Bacterial RespirationRai University
Respiration is the energy source to all living organism. Bacterial ETS system generates energy for bacteria in form of ATP using oxidative phosphorylation.
This presentation describes the process of photosynthesis on plants. In order for plants to grow, they need inputs of Carbon dioxide (CO2), water and energy. The chemical process by which plants use these resources to manufacture glucose, the building blocks of plants, is called photosynthesis.
this presentation contains briefing of the chapter as per NCERT syllabus in details that contains photosynthesis process, early experiments, photosynthetic pigments,photophosphorylation, light reactions and dark reactions n factors affecting photsynthesis.
In this ppt, you will learn about photosystem first of photosynthesis, with video and animation such a nice presentation. electron movement by animation, see and understand the system.
Photosynthesis overview
A. Purpose
B. Location
The light vs. the “dark” reaction
Chloroplasts pigments
A. Light absorption
B. Types
Light reactions
A. Photosystems
B. Photophosphorylation
V. The light independent reaction (“dark” reaction)
A. Carbon “fixation”
B. Reduction
C. Regeneration
VI. Alternative plants
B.Sc Micro II Microbial physiology Unit 2 Bacterial RespirationRai University
Respiration is the energy source to all living organism. Bacterial ETS system generates energy for bacteria in form of ATP using oxidative phosphorylation.
This presentation describes the process of photosynthesis on plants. In order for plants to grow, they need inputs of Carbon dioxide (CO2), water and energy. The chemical process by which plants use these resources to manufacture glucose, the building blocks of plants, is called photosynthesis.
this presentation contains briefing of the chapter as per NCERT syllabus in details that contains photosynthesis process, early experiments, photosynthetic pigments,photophosphorylation, light reactions and dark reactions n factors affecting photsynthesis.
number 18 please explain thanks the membrane they enable mechan.pdfmichardsonkhaicarr37
number 18 please explain
thanks the membrane they enable mechanicol work such as bacterial bacteria flagel rotating this
reaction? ATP Yield 16. What is a by-product of Events/ Products electrons and protons that
They were used to donate oxidation of glucose ATP into water and created the turned oxygen
molecules molecule molecules inder of the 32 ATP Production of 2 reduced process by which
ATP is 17, Chemiasmosis is the produced es hydrogen ions Production of 2 reduced move down
their concentration enzyme is involved in this coenzyme gradient. What protein process? ATP
synthase Release of 2 molecules summary of ATP synthesis Phosphorylation of 2 ADP
molecules 18 Complete the following summary of cellular respiration l I Release of 4 molecules
of CO2 Production of 8 reduced Up to ATP maximum
Solution
Ques-18:
Summary of ATP synthesis during cellular respiration:
Cellular respiration is the utilization of oxygen by the cell for the synthesis of metabolic products
such as sugars, fats, proteins etc. In humans, cellular respiration takes place in cytosol & in the
mitochondria (power hoses of the cell), in which the most of the metabolic processes takes place.
Blood carries the oxygen to each cell in the body and again collects the carbon dioxide.
C6H12O6 (glucose as substrate) + 6 O2 (g) 6 CO2 (g) + 6 H2O (liq) + heat
In this reaction, glucose oxidized and oxygen reduced.
Glucose ----> 686 kcal/mol of free energy
One ATP ----> produce 7.3 kcal/mol
Now 7.3 x 36 (ATP produced from one mole of glucose via glycolysis, Kreb\'s cycle, oxidative
posphorylation) = 262.8 kcal/mol for all ATP\'s produced
262.8 / 686 = 38.3% energy efficiency & it is recovered from aerobic respiration of one mole of
glucose
The remaining 423.2 kcal/mole is the energy used for the other cellular miscellaneous activities
such as some of the phosphorylation processes are mediated by ATP in both glycolysis, Krebs’s
cycle as well as during electron transport. Therefore, remaining 61.6% energy utilized during
enzymatic reaction mediated by substrate level phosphorylation reactions of cellular respiration.
The first step in cellular respiration is glycolysis.
Total per one glucose molecule ---> 4 CO2 generated
Two citric acid cycles
Two glycolysis cycles
Glycolysis is an anaerobic process & takes place in cytosol, through which one glucose
molecules is breakdown into two molecules of three-carbon pyruvate. The glycolysis of each
glucose molecule generates 2 ATP molecules. ATP synthesis from anaerobic process is via
glycolysis of glucose in the presence of various enzymes.
Glucose + 2 NAD+ (oxidized) + 2 Pi + 2 ADP 2 pyruvate + 2 NADH (reduced) + 2 ATP + 2 H+
+ 2 H2O + heat
Citric acid cycle:
The pyruvate generated by the glycolysis is converted into acetyl-CoA that enters into the citric
acid cycle. Citric acid cycle involves a series of reactions that occur in the presence of oxygen.
Citric acid cycle generates NADH, which enters into the oxidative phosphorylation process. This
.
Electron Transport Chain and oxidative phosphorylationusmanzafar66
substrate level phosphorylation and chemiosmosis
in Eukaryotes and in prokaryotes
in plant and animal
uncoupler oxidative phosphorylation
fat and protein ATP calculation
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2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Ethnobotany and Ethnopharmacology:
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The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
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2. Photosystem I
Each monomer of Photosystem I consists of a dozen proteins and over a hundred cofactors
such as (chlorophyll, bright green) and carotenoids (orange).
3. Photosystem I contains 12 polypeptides, 96 chlorophylls, 2 phylloquinones, three [4Fe-4S] clusters, 22
carotenoids, four lipids and a Ca2+ molecule.
PsaA and PsaB (red and blue), PsaF (yellow), PsaL (grey), PsaM (pink) and three stromal proteins [PsaC
(magenta), PsaD (blue) and PsaE (cyan)]. Photosystem I exists in the membrane of cyanobacteria as a
trimer.
Photosystem I: Protein components
4. PsaA and PsaB heterodimer: location of primary electron transfer chain.
peripheral PsaC protein: peripheral, similar to a small, dicluster bacterial ferredoxins.
PsaD and PsaE: peripheral, assist in docking ferredoxin, regulate cyclic electron transfer.
PsaF: plastocyanin docking.
PsaG, PsaH and PsaK: stabilization of the light harvesting complexes.
PsaI and PsaJ: structural organization of the PSI complex.
PsaL: trimerization of PSI.
5. Photosystem I: harvesting light
These antenna molecules each absorb light and transfer energy to their neighbors. Rapidly, all
of the energy funnels into the three reaction centers, where is captured to create activated
electrons.
6.
7. The electron transfer chain
The heart of photosystem I is an electron transfer chain, a chain of chlorophyll (green),
phylloquinone (orange) and three iron-sulfur clusters (yellow and red).
The electron transfer cofactors from P700 to FX are embedded within the membrane phase
and thereby shielded from the solvent.
8. The electron transfer cofactors include a pair of chlorophyll a molecules as the primary
electron donor, a chlorophyll a monomer as the primary electron acceptor and a phylloquinone
as a secondary electron acceptor. Two molecules of phylloquinone exist per reaction center.
The differences with Type II reaction centers
exist primarily on the electron acceptor side.
Photosystem I utilizes a [4Fe-4S] cluster that,
unlike the non-heme iron in the bacterial
reaction center, functions in electron transfer.
Two additional [4Fe-4S] clusters, termed FA
and FB, participate in this process by
providing a pathway for electrons to leave the
reaction center.
12. Ferredoxin
The electrons are picked up by the soluble [2Fe-2S] protein, ferredoxin, a one-electron carrier
protein, which can in turn form a complex with ferredoxin:NADP+ oxidoreductase to reduce
NADP+ to NADPH.
Plant-type ferredoxins: 1-8; Halophilic ferredoxins: 9; Vertebrate
ferredoxins: 10-11
14. The transfer of electrons from reduced ferredoxin to NADP+ is catalyzed by ferredoxin-
NADP+-reductase.
This complex contains a tightly bound FAD which accepts the electrons one at a time from
ferredoxin. The FADH2 then transfers a hydride to NADP+ to form NADPH.
Ferredoxin is a strong reductant
but can only function in one
electron reductions. NADP+ can
accept two electrons in the form
of a hydride. Thus, an
intermediary is needed to
facilitate the electron transfer.
21. Respiration is the major process by which aeorbic organisms derive energy and involving a
series of electron carriers resulting in the reduction of dioxygen to water.
The inner mitochondrial membrane is
involved in energy transduction with
protein complexes transferring
electrons in steps coupled to the
generation of proton gradient.
Respiratory complexes
In eukaryotes this process is confined
to the mitochondrion.
22. In chloroplasts, light drives the conversion of water to oxygen and NADP+ to NADPH with
transfer of H+ ions across chloroplast membranes.
In mitochondria, it is the conversion of oxygen to water, NADH to NAD+ and succinate to
fumarate that are required to generate the proton gradient.
Photosynthesis vs Respiration
23. Photosynthesis Respiration
Production of ATP Yes Yes (~ 30-32 ATP molecules per glucose)
Reactants 6CO2 and 12H2O and light energy C6H12O6 and 6O2
Requirement of sunlight Yes No
Chemical reaction 6CO2 + 12H2O + light --> C6H12O6 + 6O2 + 6H20 6O2 + C6H12O6 --> 6CO2 +6H2O + energy
Process The production of organic carbon (glucose and
starch) from inorganic carbon (carbon dioxide)
The production of ATP from the oxidation of
organic sugar compounds
Fate of oxygen and carbon
dioxide
Carbon dioxide is absorbed and oxygen is released Oxygen is absorbed and carbon dioxide is
released
What powers ATP synthase H+ gradient across thylakoid membrane into stroma H+ gradient across the inner mitochondria
membrane into matrix
What pumps protons across
the membrane
Electron transport chain Electrochemical gradient created energy that the
protons use to flow passively synthesizing ATP
Final electron receptor NADP+ (forms NADPH ) O2 (Oxygen gas)
Organisms Occurs in plants, protista (algae) and some bacteria. Occurs in all living organisms
Electron source Oxidation H2O at PSII Glucose, NADH + , FADH2
Catalyst Chlorophyll No catalyst
High electron potential
energy
From light photons From breaking bonds
24. Mitochondrial redox carriers
NADH Complex I Q Complex III Cytochrome C Complex IV O2
Complex II
FADH
The inner membrane contain four macromolecular complexes that catalyze the oxidation of
substrates such NADH/FADH2 through the action of metallo-proteins such as cytochromes
and iron sulfur proteins.
25. Complex I: NADH dehydrogenase
In mammals, there are 44 separate polypeptide chains, a
FMN and eight iron-sulfur clusters (FeS).
The structure of the 536 kDa complex comprises 16 different subunits with 64 transmembrane
helices and 9 Fe-S clusters.
There 14 ‘core’ subunits highly conserved from bacteria
to humans.
26. Electron transfer mechanism
NADH is oxidized to NAD+, by reducing FMN to FMNH2 in one two-electron step. FMNH2
is then oxidized in two one-electron steps, through a semiquinone intermediate.
27. Each electron thus transfers from the FMNH2 to an Fe-S cluster to ubiquinone (Q). Transfer of
the first electron results in the free-radical Q* (semiquinone) and transfer of the second
electron reduces the Q* to QH2 (ubiquinol).
During this process, four protons are translocated from the mitochondrial matrix to the
intermembrane space.
28. The transfer of two electrons from NADH to oxygen, through complexes I, III (bc1) and IV
(cytochrome c oxidase) results in the translocation of 10 protons across the membrane,
creating the proton-motive force (pmf) for the synthesis of ATP by ATP synthase.
NADH + H+ + CoQ + 4H+
in → NAD+ + CoQH2 + 4H+
out
It catalyses the transfer of two electrons from NADH to ubiquinone, coupled to the
translocation of four protons across the bacterial or inner mitochondrial membrane
Overall reaction
Complex I is a reversible machine able to utilize pmf and ubiquinol to reduce NAD+.
29. Complex II: Succinate dehydrogenase
Complex II consists of four protein subunits: SdhA, SdhB, SdhC and SdhD.
It is the only enzyme that participates in both the TCA and the ETC chain by catalyzing the
oxidation of succinate to fumarate with the reduction of ubiquinone to ubiquinol.
31. Complex III: Cytochrome bc1 complex
Most of the primitive members of this family contain a b-type cytochrome, a c-type
cytochrome and an iron sulfur protein (ISP).
Cytochrome b
Rieske Protein
Core 1 Protein
Core 2 Protein
Matrix side
Cytosolic side
Transmembrane region
Isolated cytochrome bc1 complexes
from eukaryotic organisms contain
10/11 subunits including a b-type
cytochrome with two heme centres, an
iron-sulfur protein (Reiske protein) and
a mono heme c-type cytochrome.
32. The complex oxidizes quinols and transfers electrons to soluble acceptors such as cytochrome
c.
QH2 + 2 cytochrome c (FeIII) + 2 H+
in → Q + 2 cytochrome c (FeII) + 4 H+
out
Electron transport
33. Complex IV: cytochrome c oxidase
Cytochrome c oxidase is the final complex of the respiratory chain catalyzing dioxygen
reduction to water. The complex contains several metal prosthetic sites and 14 protein
subunits in mammals. Isolation of cytochrome oxidase has two heme groups (a and a3)
together with two Cu centers (CuA and CuB).
34. Electron transport
Cyt c CuA heme a heme a3-CuB
The overall reaction:
4 Fe2+-cyt c + O2 + 8H+
in 4 Fe3+-
Cyt c + 2H2O + 4H+
out