1. Alzheimer's disease (AD) is a progressive brain disorder that destroys memory and thinking skills. The hallmarks of AD in the brain are beta-amyloid plaques and neurofibrillary tangles.
2. There are two main hypotheses for what causes AD - the amyloid hypothesis and tau hypothesis. The amyloid hypothesis posits that beta-amyloid protein fragments clump together to form plaques outside neurons, killing them. The tau hypothesis suggests abnormal tau proteins form tangles inside neurons, disrupting nutrient transport and killing the cells.
3. AD progresses from the earliest preclinical stage through mild, moderate, and severe stages as more brain regions are affected and cognition declines further. Currently, available
Pharmacotherapy of Alzheimer's disease
Introduction
History
Risk factors
Pathophysiology
Symptoms
Diagnosis
Non pharmacological treatment
Drugs used in treatment of Alzheimer`s
Recent advances
Screening methods
Summary
References
Pharmacotherapy of Alzheimer's disease
Introduction
History
Risk factors
Pathophysiology
Symptoms
Diagnosis
Non pharmacological treatment
Drugs used in treatment of Alzheimer`s
Recent advances
Screening methods
Summary
References
Introduction to Neuro Degenerative Diseases, Neurodegenerative diseases, Parkinson Disease, Alzhimer’s Disease, Newer Drugs
Presented by
K. THANMAYA DIVYA
Department of Pharmacology
Alzheimer's disease is a causes a progressive loss of brain cells leading to memory loss. In this slide we will learn about its causes,symptoms, pathophysiology, treatment, medication and risk factors.
A presentation about Alzheimer's disease, it's definition, it's etiology, its mechanism of development as well as actual treatment and developing treatments.
What is Alzheimer's disease? pathophysiology of disease, treatment of disease. If there is any update regarding the information provided, your comments are welcomed
Introduction to Neuro Degenerative Diseases, Neurodegenerative diseases, Parkinson Disease, Alzhimer’s Disease, Newer Drugs
Presented by
K. THANMAYA DIVYA
Department of Pharmacology
Alzheimer's disease is a causes a progressive loss of brain cells leading to memory loss. In this slide we will learn about its causes,symptoms, pathophysiology, treatment, medication and risk factors.
A presentation about Alzheimer's disease, it's definition, it's etiology, its mechanism of development as well as actual treatment and developing treatments.
What is Alzheimer's disease? pathophysiology of disease, treatment of disease. If there is any update regarding the information provided, your comments are welcomed
ANAMOLOUS SECONDARY GROWTH IN DICOT ROOTS.pptxRASHMI M G
Abnormal or anomalous secondary growth in plants. It defines secondary growth as an increase in plant girth due to vascular cambium or cork cambium. Anomalous secondary growth does not follow the normal pattern of a single vascular cambium producing xylem internally and phloem externally.
The ability to recreate computational results with minimal effort and actionable metrics provides a solid foundation for scientific research and software development. When people can replicate an analysis at the touch of a button using open-source software, open data, and methods to assess and compare proposals, it significantly eases verification of results, engagement with a diverse range of contributors, and progress. However, we have yet to fully achieve this; there are still many sociotechnical frictions.
Inspired by David Donoho's vision, this talk aims to revisit the three crucial pillars of frictionless reproducibility (data sharing, code sharing, and competitive challenges) with the perspective of deep software variability.
Our observation is that multiple layers — hardware, operating systems, third-party libraries, software versions, input data, compile-time options, and parameters — are subject to variability that exacerbates frictions but is also essential for achieving robust, generalizable results and fostering innovation. I will first review the literature, providing evidence of how the complex variability interactions across these layers affect qualitative and quantitative software properties, thereby complicating the reproduction and replication of scientific studies in various fields.
I will then present some software engineering and AI techniques that can support the strategic exploration of variability spaces. These include the use of abstractions and models (e.g., feature models), sampling strategies (e.g., uniform, random), cost-effective measurements (e.g., incremental build of software configurations), and dimensionality reduction methods (e.g., transfer learning, feature selection, software debloating).
I will finally argue that deep variability is both the problem and solution of frictionless reproducibility, calling the software science community to develop new methods and tools to manage variability and foster reproducibility in software systems.
Exposé invité Journées Nationales du GDR GPL 2024
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...University of Maribor
Slides from:
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Track: Artificial Intelligence
https://www.etran.rs/2024/en/home-english/
The use of Nauplii and metanauplii artemia in aquaculture (brine shrimp).pptxMAGOTI ERNEST
Although Artemia has been known to man for centuries, its use as a food for the culture of larval organisms apparently began only in the 1930s, when several investigators found that it made an excellent food for newly hatched fish larvae (Litvinenko et al., 2023). As aquaculture developed in the 1960s and ‘70s, the use of Artemia also became more widespread, due both to its convenience and to its nutritional value for larval organisms (Arenas-Pardo et al., 2024). The fact that Artemia dormant cysts can be stored for long periods in cans, and then used as an off-the-shelf food requiring only 24 h of incubation makes them the most convenient, least labor-intensive, live food available for aquaculture (Sorgeloos & Roubach, 2021). The nutritional value of Artemia, especially for marine organisms, is not constant, but varies both geographically and temporally. During the last decade, however, both the causes of Artemia nutritional variability and methods to improve poorquality Artemia have been identified (Loufi et al., 2024).
Brine shrimp (Artemia spp.) are used in marine aquaculture worldwide. Annually, more than 2,000 metric tons of dry cysts are used for cultivation of fish, crustacean, and shellfish larva. Brine shrimp are important to aquaculture because newly hatched brine shrimp nauplii (larvae) provide a food source for many fish fry (Mozanzadeh et al., 2021). Culture and harvesting of brine shrimp eggs represents another aspect of the aquaculture industry. Nauplii and metanauplii of Artemia, commonly known as brine shrimp, play a crucial role in aquaculture due to their nutritional value and suitability as live feed for many aquatic species, particularly in larval stages (Sorgeloos & Roubach, 2021).
Phenomics assisted breeding in crop improvementIshaGoswami9
As the population is increasing and will reach about 9 billion upto 2050. Also due to climate change, it is difficult to meet the food requirement of such a large population. Facing the challenges presented by resource shortages, climate
change, and increasing global population, crop yield and quality need to be improved in a sustainable way over the coming decades. Genetic improvement by breeding is the best way to increase crop productivity. With the rapid progression of functional
genomics, an increasing number of crop genomes have been sequenced and dozens of genes influencing key agronomic traits have been identified. However, current genome sequence information has not been adequately exploited for understanding
the complex characteristics of multiple gene, owing to a lack of crop phenotypic data. Efficient, automatic, and accurate technologies and platforms that can capture phenotypic data that can
be linked to genomics information for crop improvement at all growth stages have become as important as genotyping. Thus,
high-throughput phenotyping has become the major bottleneck restricting crop breeding. Plant phenomics has been defined as the high-throughput, accurate acquisition and analysis of multi-dimensional phenotypes
during crop growing stages at the organism level, including the cell, tissue, organ, individual plant, plot, and field levels. With the rapid development of novel sensors, imaging technology,
and analysis methods, numerous infrastructure platforms have been developed for phenotyping.
This presentation explores a brief idea about the structural and functional attributes of nucleotides, the structure and function of genetic materials along with the impact of UV rays and pH upon them.
Salas, V. (2024) "John of St. Thomas (Poinsot) on the Science of Sacred Theol...Studia Poinsotiana
I Introduction
II Subalternation and Theology
III Theology and Dogmatic Declarations
IV The Mixed Principles of Theology
V Virtual Revelation: The Unity of Theology
VI Theology as a Natural Science
VII Theology’s Certitude
VIII Conclusion
Notes
Bibliography
All the contents are fully attributable to the author, Doctor Victor Salas. Should you wish to get this text republished, get in touch with the author or the editorial committee of the Studia Poinsotiana. Insofar as possible, we will be happy to broker your contact.
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
ESR spectroscopy in liquid food and beverages.pptxPRIYANKA PATEL
With increasing population, people need to rely on packaged food stuffs. Packaging of food materials requires the preservation of food. There are various methods for the treatment of food to preserve them and irradiation treatment of food is one of them. It is the most common and the most harmless method for the food preservation as it does not alter the necessary micronutrients of food materials. Although irradiated food doesn’t cause any harm to the human health but still the quality assessment of food is required to provide consumers with necessary information about the food. ESR spectroscopy is the most sophisticated way to investigate the quality of the food and the free radicals induced during the processing of the food. ESR spin trapping technique is useful for the detection of highly unstable radicals in the food. The antioxidant capability of liquid food and beverages in mainly performed by spin trapping technique.
2. Although the risk of developing AD increases with age – in
most people with AD, symptoms first appear after age 60 –
AD is not a part of normal aging. It is caused by a fatal
disease that affects the brain.
Alzheimer’s disease is an irreversible, progressive brain
disease that slowly destroys memory and thinking skills.
What is AD?
Slide 4
3. • Plaques and Tangles
• The Changing Brain in AD
AD and the Brain
Slide 15
4. Plaques and Tangles: The Hallmarks of AD
The brains of people with AD have an abundance of two
abnormal structures:
An actual AD plaque An actual AD tangle
• beta-amyloid plaques, which are dense deposits of protein and
cellular material that accumulate outside and around nerve
cells
• Neurofibrillary tangles, which are twisted fibers that build up
inside the nerve cell
AD and the Brain
Slide 16
5. Two Major Hypotheses for AD:
b amyloid protein (BAP) v. tau
1. BAPtists:
The accumulation of a fragment of the amyloid precursor
protein or APP (the amyloid beta 42 residue fragment) leads to
the formation of plaques that someone kill neurons.
2. TAUists:
Abnormal phosphorylation of tau proteins makes them
“sticky,” leading to the break up of microtubules. The resulting
loss of axonal transport causes cell death.
6. Amyloid Hypothesis
(it’s the plaques)
1. The amyloid precursor protein (APP) is broken down by a series of
secretases. .
2. During this process, a non-soluble fragment of the APP protein
(called Ab-42) accumulates and is deposited outside the cell.
3. The non-soluble or “sticky” nature of Ab-42 helps other protein
fragments (including apoE, apolipoprotein E) to gather into
plaques
4. Somehow the plaques (or possible the migration of Ab-42 outside
the cell) cause neuronal death.
7. Enzymes cut the APP into fragments, the most important of which for AD is called b-amyloid (beta-amyloid) or
Ab.
8. Beta-amyloid is “sticky” so the fragments cling together along with other material outside of the cell,
forming the plaques seen in the AD brain.
9. b a g g
APP Protein:
a-secretase cuts APP protein, giving:
g-secretase cuts this residue, giving:
orSoluble
Soluble
a-secretase Pathway:
10. b a g g
APP Protein:
(1) b-secretase cuts APP protein, giving:
(2) g-secretase cuts this residue, giving:
or
Ab40 Fragment
Soluble
Ab42 Fragment
Un-soluble,
aggregates into
plaques
b-secretase Pathway:
(not drawn to scale)
11. Tau Hypothesis
(it’s the tangles)
1. Ordinarily, the tau protein is a microtubule-associated protein that
acts as a three-dimensional “railroad tie” for the microtubule. The
microtubule is responsible for axonal transport.
2. Accumulation of phosphate on the tau proteins cause “paired
helical filaments” or PHFs (like two ropes twisted around each
other) that accumulate and lead to the neurofibrillary tangles
(NFT). PHFs are the main component in NFTs.
3. Impaired axonal transport is the probable cause of cell death.
4. Focus on MAPT gene (microtubule-associated protein tau)
12. Microtubules are like railroad tracks that transport nutrition and other molecules. Tau-proteins
act as “ties” that stabilize the structure of the microtubules. In AD, tau proteins become
tangled, unstabilizing the structure of the microtubule. Loss of axonal transport results in cell
death.
13. Preclinical AD Signs of AD are first noticed
in the entorhinal cortex, then
proceed to the hippocampus.
Affected regions begin to
shrink as nerve cells die.
Changes can begin 10-20
years before symptoms appear.
Memory loss is the first sign
of AD.
AD and the Brain
Slide 20
14. Mild to Moderate AD
AD spreads through the brain. The
cerebral cortex begins to shrink as
more and more neurons stop
working and die.
Mild AD signs can include memory
loss, confusion, trouble handling
money, poor judgment, mood
changes, and increased anxiety.
Moderate AD signs can include
increased memory loss and
confusion, problems recognizing
people, difficulty with language
and thoughts, restlessness,
agitation, wandering, and repetitive
statements.
AD and the Brain
Slide 21
15. Severe AD
In severe AD, extreme shrinkage
occurs in the brain. Patients are
completely dependent on others for
care.
Symptoms can include weight loss,
seizures, skin infections, groaning,
moaning, or grunting, increased
sleeping, loss of bladder and bowel
control.
Death usually occurs from
aspiration pneumonia or other
infections. Care-givers can turn to a
hospital for help and palliative
care.
AD and the Brain
Slide 22
16. Classification of Anti-Alzheimer’s agents
Anti-Alzheimer’s agents are the agents which improve the
function of dementia and loss of cognitive abilities.
Slide 5
Reversible
Acetylcholinesterase inhibitor
Antialzheimer’s
NonselectiveSelective
Rivastigmine
Galantamine
Donepezil
Tacrine Memantine
17. Rivastigmine
It is carbamate derivatives
It is parasympathomimetics or cholinergic agent for the
treatment of mild to moderate dementia.
MOA-
It inhibits the enzymes both Buterylcholinesterase
(BuChE) and acetylcholinesterase (AChE) present in CNS
It prevent the hydrolysis of acetycholine, and thus
leading to an increased concentration of acetylcholine at
cholinergic synapses.
Acetycholine is an important neurotransmiter in brain
region involved in memory
Slide 6
18. Side effect-
Nausea, vometing, decreased appetite, weight loss, bloody and tarry
stools, coughing up blood or vomit that looks like blood, feeling
light-headed, fainting, chest pain, confusion, agitation and extreme
fear.
Pharmacokinetics-
Well absorbed orally
Bioavailability of about 40% in 3 mg dose
Elimination through urine
Uses-
For treatment of alzheimer disease
Slide 9
Continue...
19. It is benzazepine derived from norbelladine
It is cholinesterase inhibitor that has been used to reserve the
muscular effects of gallamine triethiodide and tubocurarine
MOA-
It involve the reversible inhibition of acetylcholinesteras,
which prevents the hydrolysis of acetylcholine
Leads to increase in conc. of Ach at cholinergic synapses
It binds allosterically with nicotinic acetylcholine receptor
and may potiantiate the action of agonists (such as Ach) at
these receptor
Galantamine
Slide 10
20. It is a centrally acting reversible acetyl cholinesterase
inhibitor
It is piperdine derivative
MOA-
It involve the reversible inhibition of acetylcholinesteras,
which prevents the hydrolysis of acetylcholine
Leads to increase in conc. of Ach at cholinergic synapses
Donepezil
Slide 11
21. It is centrally active cholinesterase inhibitor that has been
used to counter the effects of muscle relaxant, respiratory
stimulant and in treatment of alzheimer disease and other
CNS disorder
MOA-
Mechanism is not fully known
But it is proposed that the drug is an anticholinesterase
agent which reversibly binds with and inactivates
cholinesterase
This inhibit the hydrolysis of Ach, thus leading to an
accumulation of Ach at cholinergic synapse
Uses- to treat mild to moderate dementia of AD
Tacrine
Slide 12
22. It is an amantadine derivative with low to moderate affinity
for NMDA receptor.
It is noncompetitive NMDA receptor antagonist that binds
preferentially to NMDA receptor-operated cation channel
It blocks the excessive level of glutamate that may leads to
neuronal dysfunction.
MEMANTINE
Slide 13
23. MOA-
Continuous activation of the N-methyl-D-aspartate (NMDA) receptors in
the central nervous system caused by glutamate is thought to cause some
of the Alzheimer's disease symptoms. This overactivation is thought to
contribute to neurotoxicity due to the excitatory properties of glutamate.
The pharmacological effect of memantine likely occurs via the drug's
behavior as an uncompetitive (open-channel) NMDA receptor antagonist,
preventing glutamate action on this receptor.
Memantine has a preference for the NMDA receptor-operated cation
channels. Despite these antagonist effects, memantine has not been proven
to prevent or retard the neurodegeneration seen in patients diagnosed with
Alzheimer’s disease
Continue...
Slide 16
24. Continue...
Pharmacokinetic-
Well absorbed orally
Bioavailabilty approximately 100%
Peak plasma conc. Are reached in 3-7hrs
Food has no effect on absorption
Volume of distribution is 9 to 11 L/kg
Protein binding 45%
Excreated through urine .