The cytoskeleton is a network of fibers that extends throughout the cytoplasm and provides structural support to the cell. It is composed of three main types of fibers - microtubules, microfilaments, and intermediate filaments. The cytoskeleton also functions in cell motility through motor proteins that interact with the fibers to transport vesicles and organelles within the cell. It plays an important role in cell division and shape change.
Cytoskeleton - microtubules ,microfilaments and intermediate filamentsBIOTECH SIMPLIFIED
The cytoskeleton is a structure that helps cells maintain their shape and internal organization, and it also provides mechanical support that enables cells to carry out essential functions like division and movement. There is no single cytoskeletal component. Rather, several different components work together to form the cytoskeleton.
Details of cytoskeleton element-microtubule. The Microtubule associated protein-type and function, Treadmilling and dynamic instability, Structure of cilia and flagella
The delivery of newly synthesized protein to their proper cellular destination, usually referred to as protein targeting or sorting.
The mode of protein transport depends chiefly on the location in the cell cytoplasm of the polysomes involved in protein synthesis.
There are two modes of protein sorting:-
1) Co - translational Transportation.
2) Post - translational Transportation.
Ion channels, types and their importace in managment of diseasesFarazaJaved
This topic covers voltage gated type of ion channel, general structure and functioning of ion channels and involvement of different ion channel types in the pathogenesis as wella as a target for the development of various diseases.
Cytoskeleton - microtubules ,microfilaments and intermediate filamentsBIOTECH SIMPLIFIED
The cytoskeleton is a structure that helps cells maintain their shape and internal organization, and it also provides mechanical support that enables cells to carry out essential functions like division and movement. There is no single cytoskeletal component. Rather, several different components work together to form the cytoskeleton.
Details of cytoskeleton element-microtubule. The Microtubule associated protein-type and function, Treadmilling and dynamic instability, Structure of cilia and flagella
The delivery of newly synthesized protein to their proper cellular destination, usually referred to as protein targeting or sorting.
The mode of protein transport depends chiefly on the location in the cell cytoplasm of the polysomes involved in protein synthesis.
There are two modes of protein sorting:-
1) Co - translational Transportation.
2) Post - translational Transportation.
Ion channels, types and their importace in managment of diseasesFarazaJaved
This topic covers voltage gated type of ion channel, general structure and functioning of ion channels and involvement of different ion channel types in the pathogenesis as wella as a target for the development of various diseases.
It is a network of protein filaments in the cytoplasm of a cell
It provides structural framework to the cell.it also helps in the cell movement and movement of cytoplasmic components during several processes such as phagocytosis,endocytosis and exocytosis.
It consists of main three components microfilaments,microtubules and intermediate filament
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Motor molecules also carry vesicles or organelles to various destinations along “monorails’ provided by the cytoskeleton.
Interactions of motor proteins and the cytoskeleton circulates materials within a cell via streaming.
Recently, evidence is accumulating that the cytoskeleton may transmit mechanical signals that re-arrange the nucleoli and other structures.
Cilia and Flagella are complex filamentous cytoplasmic structures protruding through a cell wall.
They are minute, especially differentiated appendices of the cell.
Flagella wriggle like eels. They generate waves that pass along their length, usually from base to tip at constant amplitude.
Thus the movement of water by a flagellum is parallel to its axis while a cilium moves water perpendicular to its axis and, hence, perpendicular to the surface of the cell. The axoneme is connected with the basal body which is an intracellular granule lying in the cell cortex and which originates from the centrioles.
Each axoneme is filled with ciliary matrix, in which are embedded two central singlet microtubules, each with the 13 protofilaments and nine outer pairs of microtubules, called doublets. This recurring motif is known as the 9 + 2 array.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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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.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
3. Structural Support
Mechanical support
Maintains shape
Fibers act like a geodesic dome to stabilize and balance
opposing forces
Provides anchorage for organelles
Dynamic
Dismantles in one spot and reassembles in another to change
cell shape
4. Introduction
The cytoskeleton is a network of fibers extending
throughout the cytoplasm.
The cytoskeleton
organizes the
structures and
activities of
the cell.
5. The cytoskeleton also plays a major role in cell motility.
This involves both changes in cell location and limited movements of
parts of the cell.
The cytoskeleton interacts with motor proteins.
In cilia and flagella motor proteins pull components
of the cytoskeleton past each other.
This is also true
in muscle cells.
Fig. 7.21a
6. Motor molecules also carry vesicles or organelles to various
destinations along “monorails’ provided by the cytoskeleton.
Interactions of motor proteins and the cytoskeleton circulates
materials within a cell via streaming.
Recently, evidence is accumulating that the cytoskeleton may
transmit mechanical
signals that rearrange
the nucleoli and
other structures.
Fig. 7.21b
7. There are three main types of fibers in the cytoskeleton:
microtubules, microfilaments, and intermediate
filaments.
8.
9. Microtubules, the thickest fibers, are hollow rods about 25
microns in diameter.
Microtubule fibers are constructed of the globular protein, tubulin,
and they grow or shrink as more tubulin molecules are added or
removed.
They move chromosomes during cell division.
Another function is
as tracks that guide
motor proteins
carrying organelles
to their destination.
Fig. 7.21b
10. In many cells, microtubules grow out from a centrosome near
the nucleus.
These microtubules resist compression to the cell.
11. • In animal cells, the centrosome has a pair of
centrioles, each with nine triplets of microtubules
arranged in a ring.
• During cell division the
centrioles replicate.
Fig. 7.22
12. Microtubules are the central structural supports in cilia and
flagella.
Both can move unicellular and small multicellular organisms by
propelling water past the organism.
If these structures are anchored in a large structure, they move fluid
over a surface.
For example, cilia sweep mucus carrying trapped debris from the lungs.
Fig. 7.2
13. Cilia usually occur in large numbers on the cell surface.
They are about 0.25 microns in diameter and 2-20 microns long.
There are usually just one or a few flagella per cell.
Flagella are the same width as cilia, but 10-200 microns long.
14. A flagellum has an undulatory movement.
Force is generated parallel to the flagellum’s axis.
Fig. 7.23a
15. Cilia move more like oars with alternating power and recovery
strokes.
They generate force perpendicular to the cilia’s axis.
Fig. 7.23b
16. In spite of their differences, both cilia and flagella have the same
ultrastructure.
Both have a core of microtubules sheathed by the plasma membrane.
Nine doublets of microtubules arranged around a pair at the center,
the “9 + 2” pattern.
Flexible “wheels” of proteins connect outer doublets to each other
and to the core.
The outer doublets are also connected by motor proteins.
The cilium or flagellum is anchored in the cell by a basal body,
whose structure is identical to a centriole.
18. The bending of cilia and flagella is driven by the arms of a motor
protein, dynein.
Addition to dynein of a phosphate group from ATP and its removal
causes conformation changes in the protein.
Dynein arms alternately
grab, move, and release
the outer microtubules.
Protein cross-links limit
sliding and the force is
expressed as bending.
Fig. 7.25
19. Microfilaments, the thinnest class of the cytoskeletal fibers, are
solid rods of the globular protein actin.
An actin microfilament consists of a twisted double chain of actin
subunits.
Microfilaments are designed to resist tension.
With other proteins, they form a three-dimensional network just
inside the plasma membrane.
20. Fig. 7.26 The shape of the
microvilli in this intestinal cell
are supported by microfilaments,
anchored to a network of
intermediate filaments.
21. In muscle cells, thousands of actin filaments are arranged
parallel to one another.
Thicker filaments, composed of a motor protein, myosin,
interdigitate with the thinner actin fibers.
Myosin molecules walk along the actin filament, pulling stacks of actin
fibers together and shortening
the cell.
Fig. 7.21a
22. In other cells, these actin-myosin aggregates are less organized but still
cause localized contraction.
A contracting belt of microfilaments divides the cytoplasm of animals
cells during cell division.
Localized contraction also drives amoeboid movement.
Pseudopodia, cellular extensions, extend and contract through the
reversible assembly and contraction of actin subunits into microfilaments.
Fig. 7.21b
23. In plant cells (and others), actin-myosin interactions and sol-gel
transformations drive cytoplasmic streaming.
This creates a circular flow of cytoplasm in the cell.
This speeds the distribution of materials within the cell.
Fig. 7.21c
24. Intermediate filaments,
intermediate in size at 8 - 12
nanometers, are specialized for
bearing tension.
Intermediate filaments are built from
a diverse class of subunits from a
family of proteins called keratins.
Intermediate filaments are more
permanent fixtures of the
cytoskeleton than are the other
two classes.
They reinforce cell shape and fix
organelle location.
Fig. 7.26