This PPT Is made by Rehet Kaur Bhatia 8D And Is made with a lot of hardwork and Peace and it is not to copy . About the chapter The topic of Force and Pressure is one of the important concepts in science. It is very important to grasp every bit of this chapter as they are basics for all your future endeavours.
This PPT Is made by Rehet Kaur Bhatia 8D And Is made with a lot of hardwork and Peace and it is not to copy . About the chapter The topic of Force and Pressure is one of the important concepts in science. It is very important to grasp every bit of this chapter as they are basics for all your future endeavours.
Friction. Do you know what is friction and how it plays different roles in our general life. There are many section in our life where friction is necessary like - in playing sitar and guitar, walking on the road and to hold something in our hand or in any mechanical devices. But there are many field where friction is not required like - in machines where two surfaces meet at a point. Due to this the life of the machine parts get decreased and failure may be occur there. Know more about different laws of friction, types of friction, elimination of the friction.
This is the NCERT CBSE syllabus ppt on the topic Gravitation. It will be helpful for students studying in that class and will enable them to understand better.
Friction. Do you know what is friction and how it plays different roles in our general life. There are many section in our life where friction is necessary like - in playing sitar and guitar, walking on the road and to hold something in our hand or in any mechanical devices. But there are many field where friction is not required like - in machines where two surfaces meet at a point. Due to this the life of the machine parts get decreased and failure may be occur there. Know more about different laws of friction, types of friction, elimination of the friction.
This is the NCERT CBSE syllabus ppt on the topic Gravitation. It will be helpful for students studying in that class and will enable them to understand better.
Write about different classes of people on the clothes they were when they wear youngAs mentioned earlier, "Chirag" is a two-word short story by Phanishwar Nath Renu. The story goes as follows:
A lamp was burning in a room. A gust of wind blew through the window and extinguished the flame. The end.
The story may seem simple and straightforward, but it has a deeper meaning. The lamp represents life, and the wind represents death. The sudden extinguishing of the lamp symbolizes how life can be snuffed out in an instant. It also emphasizes the fragility of life and how we should cherish every moment we have.
Overall, "Chirag" is a poignant and thought-provoking story that leaves a lasting impact on the reader.Aman Pathak:
Conclusion on Trace the train in clothes worn at work,leisure, sports in the early 19th century qnd today in the world and india
Trace the impact of colonization on the handloom workers and industry and compare it with changes in handloom and khadi industry since independence in india with title
Conclusion of
Trace the impact of colonization on the handloom workers and industry and compare it with changes in handloom and khadi industry since independence in indiaWrite about different classes of people on the clothes they were when they wear youngAs mentioned earlier, "Chirag" is a two-word short story by Phanishwar Nath Renu. The story goes as follows:
A lamp was burning in a room. A gust of wind blew through the window and extinguished the flame. The end.
The story may seem simple and straightforward, but it has a deeper meaning. The lamp represents life, and the wind represents death. The sudden extinguishing of the lamp symbolizes how life can be snuffed out in an instant. It also emphasizes the fragility of life and how we should cherish every moment we have.
Overall, "Chirag" is a poignant and thought-provoking story that leaves a lasting impact on the reader.Aman Pathak:
Conclusion on Trace the train in clothes worn at work,leisure, sports in the early 19th century qnd today in the world and india
Trace the impact of colonization on the handloom workers and industry and compare it with changes in handloom and khadi industry since independence in india with title
Conclusion of
Trace the impact of colonization on the handloom workers and industry and compare it with changes in handloom and khadi industry since independence in indiaWrite about different classes of people on the clothes they were when they wear youngAs mentioned earlier, "Chirag" is a two-word short story by Phanishwar Nath Renu. The story goes as follows:
A lamp was burning in a room. A gust of wind blew through the window and extinguished the flame. The end.
The story may seem simple and straightforward, but it has a deeper meaning. The lamp represents life, and the wind represents death. The sudden extinguishing of the lamp symbolizes how life can be snuffed out in an instant. It also emphasizes the fragility of life and how we should cherish ever
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
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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.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
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.
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.
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.
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.
Introduction:
RNA interference (RNAi) or Post-Transcriptional Gene Silencing (PTGS) is an important biological process for modulating eukaryotic gene expression.
It is highly conserved process of posttranscriptional gene silencing by which double stranded RNA (dsRNA) causes sequence-specific degradation of mRNA sequences.
dsRNA-induced gene silencing (RNAi) is reported in a wide range of eukaryotes ranging from worms, insects, mammals and plants.
This process mediates resistance to both endogenous parasitic and exogenous pathogenic nucleic acids, and regulates the expression of protein-coding genes.
What are small ncRNAs?
micro RNA (miRNA)
short interfering RNA (siRNA)
Properties of small non-coding RNA:
Involved in silencing mRNA transcripts.
Called “small” because they are usually only about 21-24 nucleotides long.
Synthesized by first cutting up longer precursor sequences (like the 61nt one that Lee discovered).
Silence an mRNA by base pairing with some sequence on the mRNA.
Discovery of siRNA?
The first small RNA:
In 1993 Rosalind Lee (Victor Ambros lab) was studying a non- coding gene in C. elegans, lin-4, that was involved in silencing of another gene, lin-14, at the appropriate time in the
development of the worm C. elegans.
Two small transcripts of lin-4 (22nt and 61nt) were found to be complementary to a sequence in the 3' UTR of lin-14.
Because lin-4 encoded no protein, she deduced that it must be these transcripts that are causing the silencing by RNA-RNA interactions.
Types of RNAi ( non coding RNA)
MiRNA
Length (23-25 nt)
Trans acting
Binds with target MRNA in mismatch
Translation inhibition
Si RNA
Length 21 nt.
Cis acting
Bind with target Mrna in perfect complementary sequence
Piwi-RNA
Length ; 25 to 36 nt.
Expressed in Germ Cells
Regulates trnasposomes activity
MECHANISM OF RNAI:
First the double-stranded RNA teams up with a protein complex named Dicer, which cuts the long RNA into short pieces.
Then another protein complex called RISC (RNA-induced silencing complex) discards one of the two RNA strands.
The RISC-docked, single-stranded RNA then pairs with the homologous mRNA and destroys it.
THE RISC COMPLEX:
RISC is large(>500kD) RNA multi- protein Binding complex which triggers MRNA degradation in response to MRNA
Unwinding of double stranded Si RNA by ATP independent Helicase
Active component of RISC is Ago proteins( ENDONUCLEASE) which cleave target MRNA.
DICER: endonuclease (RNase Family III)
Argonaute: Central Component of the RNA-Induced Silencing Complex (RISC)
One strand of the dsRNA produced by Dicer is retained in the RISC complex in association with Argonaute
ARGONAUTE PROTEIN :
1.PAZ(PIWI/Argonaute/ Zwille)- Recognition of target MRNA
2.PIWI (p-element induced wimpy Testis)- breaks Phosphodiester bond of mRNA.)RNAse H activity.
MiRNA:
The Double-stranded RNAs are naturally produced in eukaryotic cells during development, and they have a key role in regulating gene expression .
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.
Lateral Ventricles.pdf very easy good diagrams comprehensive
Momentum
1. MOMENTUM BY: MISS RITIMA
Momentum can be defined as "mass in motion." All objects have mass; so if an object is moving, then
it has momentum - it has its mass in motion.
Momentum depends upon two variables mass and velocity.
In terms of an equation, the momentum of an object is equal to the mass of the object times the
velocity of the There are two kinds of momentum:
a. Linear momentum - An object travelling with velocity has linear momentum (mv).
b. Angular momentum -A spinning object has angular momentum.
Linear momentum
Linear momentum of a body is product of mass of body and velocity of body.
P =mv
Linear momentum of a body at rest is zero.
It is a vector quantity.
SI unit of momentum is kgm/s.
Angular momentum
Angular momentum is the quantity of rotation of a body, which is the product of its moment of inertia
and its angular velocity.
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and
rotational velocity about a particular axis.
SI units for angular momentum are kg-m2
/sec.
Law of conservation of momentum
“In an isolated system (no external force), the algebraic some of the momenta of bodies, along any
straight line, remains constant and is not changed due to their mutual action and reaction on each
other”.
Consider a body ‘A’ of mass ‘m1’ moving with a velocity strike against another body ‘B’ of mass
m2,moving with velocity in same direction as shown in the below figure. Two bodies remain in contact
with each other for small time‘t’. They get separated and move with velocities and after collision.
Let be the force exerted by ‘A’ upon ‘B’ and be its reaction. Since the system is
isolated, i.e., no external force is there,
So,
…... (1)
This is in accordance with Newton’s third law of motion that ‘action and reaction are equal and
opposite.’
Substituting for and in equation (1),
Or,
2. Thus, the total momentum of the system before collision is equal to the total momentum of the system
after collision.
This verifies the law of conservation of momentum.
It may be noted that the conservation of momentum is closely connected with the validity of Newton’s
third law of motion, since we have used equation (1) [which is nothing but third law] to prove it.
Considering the momenta of the bodies before and after collision.
APPLICATION OF CONSERVATION OF MOMENTUM
(a) Recoil of Gun
A gun and a bullet constitute one isolated system. On firing the gun, bullet moves out with a very high
velocity . The gun experiences a recoil. It moves in the opposite direction as shown in the below
figure. Velocity ‘ ’ of the recoil gun can be calculated by the application of law of conservation of
momentum.
Before Firing After Firing
Momentum of bullet = 0 Momentum of bullet =
Momentum of gun = 0 Momentum of gun =
Total momentum of the system = 0 Total momentum of the system =
3. Here ‘m’ and ‘M’ are the masses of bullet and gun respectively. According to the law of conservation of
momentum, momentum before collision and after collision must be same.
or,
or,
Negative sign indicates that direction of motion of gun is in opposite direction.
(b) Rocket and Jet Plane
Fuel and oxygen is burnt in the ignition chamber. As hot gases escape from a rear opening, with some
momentum, the rocket moves in the forward direction with the same momentum.
(c) Explosion of a Bomb
Momentum of a bomb before explosion is zero. After explosion different fragments fly in various
directions. It will be observed that their momenta, when represented by the slide of a polygon, from a
closed polygon, indicating that net momentum after explosion is also zero. Thus, if the bomb exploded
into two fragments, they must move in opposite directions.
(d) A man Jumping from a Boat
When a man jumps from the boat to the shore, the boat is pushed backward. It can, exactly, be explained as in the
case of recoil of gun.