1) The document discusses various biological processes involving the movement of molecules, including diffusion, osmosis, gas exchange in the lungs, diffusion of nutrients in the small intestine and cells.
2) Key examples are how oxygen and carbon dioxide diffuse in and out of the lungs during breathing, and how water, dissolved nutrients and minerals move in and out of cells and tissues by diffusion and active transport.
3) Experiments are described to demonstrate diffusion and osmosis, such as using a semipermeable membrane in a sugar solution to show osmosis.
Mr Exham IGCSE - Movement In And Out Of Cellsmrexham
This is a presentation designed to help explain the section of the Edexcel IGCSE Biology course about movement in and out of cells. For more help with IGCSE Biology please visit mrexham.com
This is a presentation designed to help explain the section of the Edexcel IGCSE Biology course about respiration. For more help with IGCSE Biology please visit mrexham.com
Mr Exham IGCSE - Movement In And Out Of Cellsmrexham
This is a presentation designed to help explain the section of the Edexcel IGCSE Biology course about movement in and out of cells. For more help with IGCSE Biology please visit mrexham.com
This is a presentation designed to help explain the section of the Edexcel IGCSE Biology course about respiration. For more help with IGCSE Biology please visit mrexham.com
This is the first PowerPoint in the mrexham IGCSE Biology series. It is also available on iBooks.
It covers the Cells section from life processes of the Edexcel IGCSE Biology course
IGCSE Biology - Chemical Coordination in Plantsmrexham
This PowerPoint answers the following questions:
Do you understand that plants respond to stimuli?
Can you give an example of positive phototropism?
How do plant roots and stems respond to gravity?
It covers section 3.3 of the IGCSE Edexcel Biology Course.
Diffusion - Definition, Examples, Types, and Factors Affecting It.pdfChloe Cheney
What is diffusion & what are factors that influence diffusion? Diffusion is everywhere around us. Learn more about it & its various types like passive diffusion
Active transport
Types of Active Transport
Primary Active transport
Sodium-Potassium pump
secondary Active transport
uniport, Symport, Antiport
Endocytosis
Types of endocytosis
Phagocytosis
Pinocytosis
Receptor-mediated endocytosis
Exocytosis
Purposes of Endocytosis and Exocytosis
Passive Transport
Types of Passive Transport
Diffusion
Osmosis
Facilitated Diffusion
What causes diffusion?
Why is diffusion useful?
Supercritical fluid
Osmotic Solutions
Isotonic Solution
Hypertonic Solution
Hypotonic Solution
Types of Osmosis
Difference Between Endosmosis And Exosmosis
Significance of Osmosis
Factors Affecting Facilitated Diffusion
Importance of Facilitated Diffusion
Transmembrane Proteins
Channel Proteins and carrier protein
This is the first PowerPoint in the mrexham IGCSE Biology series. It is also available on iBooks.
It covers the Cells section from life processes of the Edexcel IGCSE Biology course
IGCSE Biology - Chemical Coordination in Plantsmrexham
This PowerPoint answers the following questions:
Do you understand that plants respond to stimuli?
Can you give an example of positive phototropism?
How do plant roots and stems respond to gravity?
It covers section 3.3 of the IGCSE Edexcel Biology Course.
Diffusion - Definition, Examples, Types, and Factors Affecting It.pdfChloe Cheney
What is diffusion & what are factors that influence diffusion? Diffusion is everywhere around us. Learn more about it & its various types like passive diffusion
Active transport
Types of Active Transport
Primary Active transport
Sodium-Potassium pump
secondary Active transport
uniport, Symport, Antiport
Endocytosis
Types of endocytosis
Phagocytosis
Pinocytosis
Receptor-mediated endocytosis
Exocytosis
Purposes of Endocytosis and Exocytosis
Passive Transport
Types of Passive Transport
Diffusion
Osmosis
Facilitated Diffusion
What causes diffusion?
Why is diffusion useful?
Supercritical fluid
Osmotic Solutions
Isotonic Solution
Hypertonic Solution
Hypotonic Solution
Types of Osmosis
Difference Between Endosmosis And Exosmosis
Significance of Osmosis
Factors Affecting Facilitated Diffusion
Importance of Facilitated Diffusion
Transmembrane Proteins
Channel Proteins and carrier protein
BIOL1408 Introductory Biology Name Lab Unit 67 Diff.docxhartrobert670
BIOL1408 Introductory Biology Name
Lab Unit 6/7: Diffusion & Osmosis date
Dr. Flo Oxley
In this lab unit, you will follow your eSciences ACC Lab Manual (posted in Blackboard: “Lab Manual”) to
learn about diffusion, osmosis, and how these processes work inside cells to support life.
This document will serve as your guide, sending you to the relevant lab activities and introductory
information found in the eSciences lab manual (pages for this unit are 68 - 81), or in the online replication of
the eScience lab manual uploaded to Blackboard for those of you who prefer to follow along online.
NOTE: I recommend that you read from this lab guide & report document first, going to the
eSciences manual materials only as directed. Students previously using the lab manual
have found that the additional background information provided in this document and the
step-by-step guidance through the eSciences lab materials to be beneficial.
BACKGROUND INFORMATION: DIFFUSION
Diffusion is the net movement of a solute away from an area of high concentration towards an area of lower
concentration. If you have ever watched tea diffusing from a tea bag, you are familiar with the process of
diffusion. You have watched the brown molecules leaving the tea bag until eventually the tea become
uniformly brown. This is sometimes referred to as solute molecules moving down their concentration
gradient.
Notice that I said that it is NET movement of a solute. This means that like all molecules in liquid and gas
phases, solute molecules move randomly in all directions. There is no driving force for sending a solute
molecule down its concentration gradient other than there is no way to prevent the random movement of
molecules. Eventually, the solute molecules will become totally randomized in their distribution throughout
the solvent.
What does diffusion have to do with biology? Virtually all movements of molecules into and out of, and
around the interior of the cell relies on diffusion of solutes. The removal of waste products from the cell
relies on the random movement of these molecules from the inside of the cell to the outside of the cell.
Similarly, the uptake of vital nutrients relies on their diffusion from the outside to the inside of the cell. The
circulatory system speeds these processes up by sweeping nutrients into the vicinity of cells and sweeping
away waste products from the cells to be excreted elsewhere from the body.
Note that the diffusion of oxygen (a vital nutrient) and carbon dioxide (an ever-present waste product of
cellular respiration) are a part of this story. Diffusion is critical in the process of providing nutrients and
oxygen circulating in the bloodstream to cells. A cell must be close to a capillary, within100 microns from a
capillary, in order for these metabolites to diffuse to the cell quickly enough. If it is farther than that from the
cell, it will not receive the ...
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Osmosis and Diffusion
Diffusion and Osmosis in an egg
Low concentration
1.1 Diffusion is the process of molecules spreading from areas of high concentration to areas of low concentration.
High concentration
1.1 Osmosis is the diffusion of water molecules through a semi permeable membrane from the area of low concentration of solute to the area of high concentration of solute.
1.2 Diffusion is important to living cells because it s the way they take in materials from the environment, and they also prevent themselves of unwanted materials produced in their cells. Osmosis on the other hand, is also important to living cells, because it s the way that water can enter and leave their cells through diffusion (class note the movement of molecules).
1.3 Aim:...show more content...The egg with the most amount of sucrose solution gained the most weight.
4.1 Specific organism involved in Osmosis and diffusion:
In the human body osmosis and diffusion is involved in the process of cleaning/filtering the kidney, where diffusion is used to selectively move solutes through the cells and Osmosis is used to absorb 99% of the water (Ivyrose Ltd. 2003).
4.2 How osmosis and diffusion is used in the kidneys:
Diffusion is a form of transport, which requires no energy (passive transport), and allows substances to flow from areas of high concentration, to areas of low concentration, and Osmosis happens when water is flowed from areas of high concentration, to areas of low concentration.
In the case of the kidneys, when human kidneys filter/clean blood it uses three mechanisms, two of the mechanisms is, Osmosis and diffusion. Most of the energy that our kidneys consume is reabsorbed by sodium ions (Na+), w
Cancer cell metabolism: special Reference to Lactate PathwayAADYARAJPANDEY1
Normal Cell Metabolism:
Cellular respiration describes the series of steps that cells use to break down sugar and other chemicals to get the energy we need to function.
Energy is stored in the bonds of glucose and when glucose is broken down, much of that energy is released.
Cell utilize energy in the form of ATP.
The first step of respiration is called glycolysis. In a series of steps, glycolysis breaks glucose into two smaller molecules - a chemical called pyruvate. A small amount of ATP is formed during this process.
Most healthy cells continue the breakdown in a second process, called the Kreb's cycle. The Kreb's cycle allows cells to “burn” the pyruvates made in glycolysis to get more ATP.
The last step in the breakdown of glucose is called oxidative phosphorylation (Ox-Phos).
It takes place in specialized cell structures called mitochondria. This process produces a large amount of ATP. Importantly, cells need oxygen to complete oxidative phosphorylation.
If a cell completes only glycolysis, only 2 molecules of ATP are made per glucose. However, if the cell completes the entire respiration process (glycolysis - Kreb's - oxidative phosphorylation), about 36 molecules of ATP are created, giving it much more energy to use.
IN CANCER CELL:
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
introduction to WARBERG PHENOMENA:
WARBURG EFFECT Usually, cancer cells are highly glycolytic (glucose addiction) and take up more glucose than do normal cells from outside.
Otto Heinrich Warburg (; 8 October 1883 – 1 August 1970) In 1931 was awarded the Nobel Prize in Physiology for his "discovery of the nature and mode of action of the respiratory enzyme.
WARNBURG EFFECT : cancer cells under aerobic (well-oxygenated) conditions to metabolize glucose to lactate (aerobic glycolysis) is known as the Warburg effect. Warburg made the observation that tumor slices consume glucose and secrete lactate at a higher rate than normal tissues.
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.
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
Thanks...!
A brief information about the SCOP protein database used in bioinformatics.
The Structural Classification of Proteins (SCOP) database is a comprehensive and authoritative resource for the structural and evolutionary relationships of proteins. It provides a detailed and curated classification of protein structures, grouping them into families, superfamilies, and folds based on their structural and sequence similarities.
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.
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 .
(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.
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.