The sea floor is about 4.6 billion years old and covers most of the Earth's surface. It is composed of ocean basins like the Pacific, Atlantic, Indian, and Arctic oceans. The sea floor is constantly changing through the process of plate tectonics, where lithospheric plates move across Earth's surface. New sea floor is created at mid-ocean ridges through the process of sea floor spreading, while ocean trenches form as plates subduct under each other. The structure and composition of the sea floor provides clues about Earth's geological history.
Biological and chemical oceanography.Chemical Oceanography is fundamentally interdisciplinary. The chemistry of the ocean is closely tied to ocean circulation, climate, the plants and animals that live in the ocean, and the exchange of material with the atmosphere, cryosphere, continents, and mantle
Biological oceanography gradually grew into a major scientific discipline with all these observations of marine organisms and their environments. In this episode, the following modules are highlighted:1. Nature of marine environment, 2. Classification of Marine environment, 3. Role of abiotic parameters on marine life, 4. Marine Flora , and 5. Marine Fauna.
Biological oceanography is a major scientific discipline dealing with all aspects of marine life under different zones of the oceanic environments. The interest to study biology by humans started as early as fourth century BC when Aristotle described about 180 species of marine animals. The geographical knowledge of oceans got improved after several great sea expeditions conducted by the people from 15th to 16th centuries. Through Ocean explorations people conducted detailed underwater surveys and mapped the ocean floors with respect to their physical features, chemistry and biological conditions.
Biological and chemical oceanography.Chemical Oceanography is fundamentally interdisciplinary. The chemistry of the ocean is closely tied to ocean circulation, climate, the plants and animals that live in the ocean, and the exchange of material with the atmosphere, cryosphere, continents, and mantle
Biological oceanography gradually grew into a major scientific discipline with all these observations of marine organisms and their environments. In this episode, the following modules are highlighted:1. Nature of marine environment, 2. Classification of Marine environment, 3. Role of abiotic parameters on marine life, 4. Marine Flora , and 5. Marine Fauna.
Biological oceanography is a major scientific discipline dealing with all aspects of marine life under different zones of the oceanic environments. The interest to study biology by humans started as early as fourth century BC when Aristotle described about 180 species of marine animals. The geographical knowledge of oceans got improved after several great sea expeditions conducted by the people from 15th to 16th centuries. Through Ocean explorations people conducted detailed underwater surveys and mapped the ocean floors with respect to their physical features, chemistry and biological conditions.
Oceans also contain a huge amount of mineral resources. Deep ocean basins are the zones of continuous sedimentation. The oceans are the final destination for many of all the sediments to be deposited. About 200 million years of earth history are available in the fossiliferous sediments deposited within the ocean basins. This module explains the characteristics of marine sediments.
The study of physical oceanography helps in understanding all these aspects in detail. Let us see most of these factors and processes in our future modules. Mathematical models of all these processes are also developed using these phenomena and mechanisms. The individual aspects of all the elements of physical oceanography are to be studied in detail.
Chemical Oceanography is fundamentally interdisciplinary. The chemistry of the ocean is closely tied to ocean circulation, climate, the plants and animals that live in the ocean, and the exchange of material with the atmosphere, cryosphere, continents, and mantle
Waves are never ending dynamic surfaces created by the action of wind on ocean surfaces. Waves are undulations of the surface layers of bodies of sea waters. Large bodies of water are almost constantly in motion. Ocean surface are never calm and smooth.They are uneven, irregular, rough and restless. Sea waves are defined as undulations of seawater characterized by unique features. Waves are moving energy patterns. They travel along the interface between ocean and the atmosphere.
Oceans also contain a huge amount of mineral resources. Deep ocean basins are the zones of continuous sedimentation. The oceans are the final destination for many of all the sediments to be deposited. About 200 million years of earth history are available in the fossiliferous sediments deposited within the ocean basins. This module explains the characteristics of marine sediments.
The study of physical oceanography helps in understanding all these aspects in detail. Let us see most of these factors and processes in our future modules. Mathematical models of all these processes are also developed using these phenomena and mechanisms. The individual aspects of all the elements of physical oceanography are to be studied in detail.
Chemical Oceanography is fundamentally interdisciplinary. The chemistry of the ocean is closely tied to ocean circulation, climate, the plants and animals that live in the ocean, and the exchange of material with the atmosphere, cryosphere, continents, and mantle
Waves are never ending dynamic surfaces created by the action of wind on ocean surfaces. Waves are undulations of the surface layers of bodies of sea waters. Large bodies of water are almost constantly in motion. Ocean surface are never calm and smooth.They are uneven, irregular, rough and restless. Sea waves are defined as undulations of seawater characterized by unique features. Waves are moving energy patterns. They travel along the interface between ocean and the atmosphere.
CSEC Geography- Internal Forces - Plate Tectonics and EarthquakesOral Johnson
This document looks at the Earth's internal forces. The main layers of the earth are described. The history surrounding plate tectonics is discussed. The different types of plate boundaries is also explained.
This is the entire CSEC geography syllabus (some things might be missing). The information was collected from various websites and textbooks. The topics are:
- Internal forces
-External forces
-Rivers
-Limestone
-Coasts
-Coral reefs and Mangroves
-Weather and Climate
- Ecosystems (vegetation and soils)
-Natural hazards
- Urbanization
-Economic activity
-Environmental degradation
Multi-source connectivity as the driver of solar wind variability in the heli...Sérgio Sacani
The ambient solar wind that flls the heliosphere originates from multiple
sources in the solar corona and is highly structured. It is often described
as high-speed, relatively homogeneous, plasma streams from coronal
holes and slow-speed, highly variable, streams whose source regions are
under debate. A key goal of ESA/NASA’s Solar Orbiter mission is to identify
solar wind sources and understand what drives the complexity seen in the
heliosphere. By combining magnetic feld modelling and spectroscopic
techniques with high-resolution observations and measurements, we show
that the solar wind variability detected in situ by Solar Orbiter in March
2022 is driven by spatio-temporal changes in the magnetic connectivity to
multiple sources in the solar atmosphere. The magnetic feld footpoints
connected to the spacecraft moved from the boundaries of a coronal hole
to one active region (12961) and then across to another region (12957). This
is refected in the in situ measurements, which show the transition from fast
to highly Alfvénic then to slow solar wind that is disrupted by the arrival of
a coronal mass ejection. Our results describe solar wind variability at 0.5 au
but are applicable to near-Earth observatories.
Slide 1: Title Slide
Extrachromosomal Inheritance
Slide 2: Introduction to Extrachromosomal Inheritance
Definition: Extrachromosomal inheritance refers to the transmission of genetic material that is not found within the nucleus.
Key Components: Involves genes located in mitochondria, chloroplasts, and plasmids.
Slide 3: Mitochondrial Inheritance
Mitochondria: Organelles responsible for energy production.
Mitochondrial DNA (mtDNA): Circular DNA molecule found in mitochondria.
Inheritance Pattern: Maternally inherited, meaning it is passed from mothers to all their offspring.
Diseases: Examples include Leber’s hereditary optic neuropathy (LHON) and mitochondrial myopathy.
Slide 4: Chloroplast Inheritance
Chloroplasts: Organelles responsible for photosynthesis in plants.
Chloroplast DNA (cpDNA): Circular DNA molecule found in chloroplasts.
Inheritance Pattern: Often maternally inherited in most plants, but can vary in some species.
Examples: Variegation in plants, where leaf color patterns are determined by chloroplast DNA.
Slide 5: Plasmid Inheritance
Plasmids: Small, circular DNA molecules found in bacteria and some eukaryotes.
Features: Can carry antibiotic resistance genes and can be transferred between cells through processes like conjugation.
Significance: Important in biotechnology for gene cloning and genetic engineering.
Slide 6: Mechanisms of Extrachromosomal Inheritance
Non-Mendelian Patterns: Do not follow Mendel’s laws of inheritance.
Cytoplasmic Segregation: During cell division, organelles like mitochondria and chloroplasts are randomly distributed to daughter cells.
Heteroplasmy: Presence of more than one type of organellar genome within a cell, leading to variation in expression.
Slide 7: Examples of Extrachromosomal Inheritance
Four O’clock Plant (Mirabilis jalapa): Shows variegated leaves due to different cpDNA in leaf cells.
Petite Mutants in Yeast: Result from mutations in mitochondrial DNA affecting respiration.
Slide 8: Importance of Extrachromosomal Inheritance
Evolution: Provides insight into the evolution of eukaryotic cells.
Medicine: Understanding mitochondrial inheritance helps in diagnosing and treating mitochondrial diseases.
Agriculture: Chloroplast inheritance can be used in plant breeding and genetic modification.
Slide 9: Recent Research and Advances
Gene Editing: Techniques like CRISPR-Cas9 are being used to edit mitochondrial and chloroplast DNA.
Therapies: Development of mitochondrial replacement therapy (MRT) for preventing mitochondrial diseases.
Slide 10: Conclusion
Summary: Extrachromosomal inheritance involves the transmission of genetic material outside the nucleus and plays a crucial role in genetics, medicine, and biotechnology.
Future Directions: Continued research and technological advancements hold promise for new treatments and applications.
Slide 11: Questions and Discussion
Invite Audience: Open the floor for any questions or further discussion on the topic.
What is greenhouse gasses and how many gasses are there to affect the Earth.moosaasad1975
What are greenhouse gasses how they affect the earth and its environment what is the future of the environment and earth how the weather and the climate effects.
Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
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/
Richard's entangled aventures in wonderlandRichard 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.
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...Scintica Instrumentation
Intravital microscopy (IVM) is a powerful tool utilized to study cellular behavior over time and space in vivo. Much of our understanding of cell biology has been accomplished using various in vitro and ex vivo methods; however, these studies do not necessarily reflect the natural dynamics of biological processes. Unlike traditional cell culture or fixed tissue imaging, IVM allows for the ultra-fast high-resolution imaging of cellular processes over time and space and were studied in its natural environment. Real-time visualization of biological processes in the context of an intact organism helps maintain physiological relevance and provide insights into the progression of disease, response to treatments or developmental processes.
In this webinar we give an overview of advanced applications of the IVM system in preclinical research. IVIM technology is a provider of all-in-one intravital microscopy systems and solutions optimized for in vivo imaging of live animal models at sub-micron resolution. The system’s unique features and user-friendly software enables researchers to probe fast dynamic biological processes such as immune cell tracking, cell-cell interaction as well as vascularization and tumor metastasis with exceptional detail. This webinar will also give an overview of IVM being utilized in drug development, offering a view into the intricate interaction between drugs/nanoparticles and tissues in vivo and allows for the evaluation of therapeutic intervention in a variety of tissues and organs. This interdisciplinary collaboration continues to drive the advancements of novel therapeutic strategies.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
Nutraceutical market, scope and growth: Herbal drug technologyLokesh Patil
As consumer awareness of health and wellness rises, the nutraceutical market—which includes goods like functional meals, drinks, and dietary supplements that provide health advantages beyond basic nutrition—is growing significantly. As healthcare expenses rise, the population ages, and people want natural and preventative health solutions more and more, this industry is increasing quickly. Further driving market expansion are product formulation innovations and the use of cutting-edge technology for customized nutrition. With its worldwide reach, the nutraceutical industry is expected to keep growing and provide significant chances for research and investment in a number of categories, including vitamins, minerals, probiotics, and herbal supplements.
3. about 4.6 billion years old
Geology: the science that deals with the
dynamics and physical history of the earth,
the rocks of which it is composed, and the
physical, chemical, and biological changes
that the earth has undergone or is
undergoing
4. In most cases we will discuss geology in
terms of habitats, the places in which
organisms live
5. Oceans cover 72% of the globe and 80% of
that is still considered undiscovered
◦ 2/3 of the earth’s land mass is in the Northern
Hemisphere, which is only 61% ocean
◦ 80% of the Southern Hemisphere is ocean
6.
7. 1. Pacific - Largest and
deepest
◦ almost as large as the
other 3 combined
2. Atlantic - Second
largest
◦ similar to Indian in avg.
depth
3. Indian - Third largest
◦ similar to Atlantic in avg.
depth
4. Arctic - Smallest and
shallowest
8. All four basins are connected
This connection is most obvious when the
world is viewed form the south pole
◦ Fig 2.2
9. Oceanographers often speak of one world
ocean
World Ocean: Refers to the continuous body
of water that surrounds Antarctica as the
Southern Ocean
10.
11. The Earth and our solar system is thought to
have originated about 4.6 billion years ago
from clouds or clouds of dust.
Big Bang: A great cosmic explosion that is
estimated to have occurred 13.7 billion years
ago in which dust particles collided with each
other merging into larger particles that again
collided with each other eventually building
up the earth and other planets
12. Density: the mass of
a given volume of a
substance;
Mass/Volume
When the Earth was
formed it was most
likely molten
◦ This allowed the
interior of the Earth to
form based on density
Fig 2.3
13.
14. Core: Innermost layer of the Earth that is
composed mainly of iron
◦ Pressure at the core is more than a million times
the pressure on the Earth’s surface
◦ Made up of a solid inner core and a liquid outer
core
◦ It is thought that the swirling motions of the liquid
material in the iron-rich outer core produce the
earth’s magnetic field
15. Mantle: The layer
outside the earth’s
core
◦ most of it is thought
to be solid, but very
hot - near the point
of melting rock
◦ much of the mantle
slowly flows almost
like liquid
16. Lithosphere: The fairly rigid layer of the
earth’s surface composed of the crust and
upper-most part of the mantle.
◦ About 100 km (60 mi) thick
◦ Means “rock sphere”
◦ Broken up into a number of plates called
lithospheric plates
Lithospheric Plates: A part of the lithosphere
that can contain continental crust, oceanic
crust, or both
17.
18. Asthenosphere: The denser, more plastic
layer of the upper mantle on which the
lithosphere floats
The distinction between the lithosphere and
the asthenosphere is based on how easily the
rock flows
19. Crust: The outermost layer of the earth
◦ extremely thin in comparison to the other layers of
the earth
◦ Earth’s skin
22. Oceanic crust: The
earth’s crust that
makes up the sea
floor, generally
made up of the
mineral basalt
◦ Denser than
continental crust
◦ Thinner than
continental crust
23. Continental crust: The earth’s crust that
makes up the land portions of the world,
most continental rocks are made of granite
◦ Older than the oceanic crust
25. Sir Francis Bacon
◦ noted that the coasts of the continents on opposite
sides of the Atlantic fit together like pieces of a
giant puzzle
◦ Evidence in coal deposits, geological formations,
and fossil findings
26. Alfred Wegener
◦ German geophysicist
◦ proposed the first
detailed hypothesis of
continental drift in 1912
◦ suggested that all the
continents had once been
a single “supercontinent”
he named Pangaea
biggest obstacle was his
inability to explain how
this had occurred
27. Continental drift: The movement of
continental masses on the surface of the
earth
28. Pangaea: The single large landmass, or
supercontinent, that broke up to form today’s
continents (Fig 2.16a)
One giant sea called Panthalassa which is the
ancestor of the modern Pacific
29. Theory of plate tectonics: The process
involved in the movement of large plates on
the earth’s crust
30.
31. Mid-ocean Ridge: A continuous chain of
submarine volcanic mountains that encircles
the globe like the seams on a baseball
◦ The largest geological feature on earth
◦ Displaced at locations by cracks known as faults
◦ Occasionally these mountains rise so high that they
break the surface to form islands such as Iceland
and the Azores
◦ Earthquakes tend to cluster near the sites of ridges
32. Fault: A crack in the earth’s crust usually
formed when two pieces of crust are moving
past each other
33. Mid-Atlantic Ridge: a chain of submarine
volcanic mountains that runs down the center
of the Atlantic Ocean, closely following the
curves of the opposing coastlines.
◦ The ridge forms an inverted Y in the Indian Ocean
and runs up the eastern side of the Pacific
◦ The main section of ridge in the Eastern Pacific is
called the East Pacific Rise.
34.
35. Surveys of the sea floor also revealed a
system of trenches
Trench: A deep depression in the sea floor
◦ especially common in the Pacific
◦ Usually many volcanoes nearby
◦ Lithosphere is destroyed
36. A trench is formed when two plates collide and
one of the plates sips below the other and
sinks back down into the mantle
Subduction: The downward movement of the
plate into the mantle
Trenches are also known as Subduction Zones
37.
38. The nature of the sea floor is related to the
mid-ocean ridge
Sea floor rock right near the ridge is very
young and the rock gets progressively older
moving away from the ridge
39. Sediment: Loose
material like
sand and mud
that settles to
the bottom,
layers get thicker
at greater
distance from
the ridge
40. From time to time the earth’s magnetic field
reverses direction
◦ Reversals happen every 700,000 years on average
◦ thought to be related to movements of material in
the earth’s outer core
Many rocks contain tiny magnetic particles
Magnetic Anomalies: Magnetic bands or
“stripes” in the sea floor running parallel to
the mid-ocean ridge
41.
42. Rifts: Cracks in the oceanic crust separating
at the mid-ocean ridges
releases some of the pressure form the
underlying mantle
allows hot mantle material to melt and rise up
through the rift
magma pushes up the oceanic crust around
the rift to form the mid-ocean ridge (Fig. 2.9)
43. Sea-floor Spreading: The entire process by
which the sea floor moves away from the
mid-ocean ridges to create new sea floor
Also known as spreading centers
explains crust and sediment build up, and
magnetic anomalies
44.
45.
46. Continental margins: are the boundaries
between continental crust and oceanic crust
The shallowest part of the continental
margin is the continental shelf
consists of the shelf to shelf break,
continental slope, continental rise to
abyssal plains
47. Continental shelf
make up about 8% of the ocean’s surface
area
biologically richest part of the ocean
◦ most life and best fishing
◦ composed of continental crust
The continental shelf ends at the shelf
break where the slope abruptly gets steeper
48.
49. Two types of margins
Active Margins: zones of intense geological activity,
including earthquakes and volcanoes
◦ ex. South America’s western coast
Passive Margins: zones of little geological activity
with flat coastal plains, wide shelves and gradual
continental slopes
◦ ex. South America’s eastern coast
50.
51.
52. Ocean sediment holds many clues to the
earth’s past
Most marine sediments are of two basic
types:
lithogenous sediment: which is derived from
weathering and is usually deposited near
coasts
biogenous sediment: which consists of the
shells and skeletons of marine animals
53. some biogenous sediment is composed of
calcium carbonate (CaCO3)
This is called calcareous ooze
54. Uses the isotope C14 to age a fossil
Half-life of 5,700 C14 to tell the age of the
fossil, the percentage of C12 remains
constant
Can date something up to 50,000 - 60,000
years old
55.
56. Global warming is the increase in the average
temperature of the Earth’s near surface air
and oceans since the mid-20th century, and
its projected continuation
57. Increasing global temperature is expected to
cause sea levels to rise, an increase in the
intensity of extreme weather events, and
significant changes to the amount and
pattern of precipitation
58. Likely leading to an
increase in tropical
areas and increased
rates of desertification,
changes in agricultural
yields, modification of
trade routes, glacier
retreats, mass species
extinctions and
increases in the ranges
of disease vectors