The document discusses the structure and function of cells. It defines the cell as the basic structural and functional unit of life. Human beings contain billions of cells arranged into over 200 types across four basic tissue groups. The document then describes the key components of cells including the cell membrane, cytoplasm, organelles like mitochondria and lysosomes, and inclusions. It provides detailed information on the structure and functions of the cell membrane and various organelles.
Introduction
Structure of Plasma Membranes
Functions of Plasma Membranes
Cytoplasm: Cytosol, Organelles
Functions of Cytoplasm
Ribosome, Functions of Ribosomes
2. Endoplasmic reticulum (ER)
a. Rough Endoplasmic Reticulum and its Functions
b. Smooth ER and its Functions
3. Golgi complex and its Functions
4.Lysosomes and its Functions
5. Peroxisomes and its Functions
6. Proteasomes and its Functions
7.Mitochondria and its Functions
8. Cytoskeletal
a. Microfilaments and its Functions
b. Intermediate filaments and its Functions
c. Microtubules and its Functions
9. Centrosome and its Functions
10. Cilia and Flagella and its Functions
11. Nucleus and its Functions
a. Nuclear Membrane and its Functions
b. Nucleoplasm and its Functions
c. Chromosomes and its Functions
d. Nucleolus and its Functions
The cell membrane is composed of a lipid bilayer with embedded proteins. The lipid bilayer is fluid and allows only fat-soluble substances to pass through. Integral proteins span the membrane while peripheral proteins are attached to surfaces. Membrane proteins function in transport, structure, signaling and more. Carbohydrates attached to proteins and lipids form the glycocalyx and function in cell recognition and selective permeability. The cell membrane protects the cell, regulates what enters and exits, and maintains the cell's shape and size.
The document describes the main organelles found in animal cells including their structures, locations within the cell, and functions. The organelles discussed are the nucleus, ribosomes, endoplasmic reticulum, Golgi apparatus, mitochondria, lysosomes, and peroxisomes. Each organelle plays an important role such as generating energy, modifying and transporting proteins, breaking down waste, and carrying genetic instructions.
The document summarizes key organelles and structures found within eukaryotic cells, including:
1) The cytosol is the jelly-like material within the cell cytoplasm with dissolved substances like amino acids.
2) The nucleus contains the cell's DNA and controls the cell. Inside is the nucleolus which makes ribosomes.
3) Mitochondria convert food into ATP for energy in most eukaryotic cells, with more in muscle cells. They have inner and outer membranes.
4) The endoplasmic reticulum synthesizes proteins and lipids, with ribosomes on the rough ER and no ribosomes on the smooth ER.
This provides a high-level overview of
Biology Class 11 Chapter 8
FOR FURTHER DETAILS YOU CAN WATCH THE RELATED VIDEO AT THE GIVEN LINK
https://www.youtube.com/channel/UCxo06Nj-QWo_7SNvMyDnJCQ?view_as=subscriber
The document summarizes the key components of the cell including the plasma membrane, cytoplasm, and nucleus. It provides details on the structure and functions of the plasma membrane, including the lipid bilayer structure and roles of membrane proteins. It then describes the two main parts of the cytoplasm - the cytosol and organelles within it. Specific organelles are outlined like the endoplasmic reticulum, Golgi complex, lysosomes, and peroxisomes. The nucleus is noted as housing the cell's DNA within chromosomes.
All organisms are composed of cells, which are the basic unit of life. Most cells are small, around 1-10 micrometers, and can only be seen under a microscope. Cells come in various shapes and sizes and perform specialized functions. They contain organelles that carry out different tasks to keep the cell functioning. The nucleus houses genetic material and controls cellular activities, while other organelles like mitochondria produce energy and the endoplasmic reticulum and Golgi apparatus modify and transport cellular products.
Introduction
Structure of Plasma Membranes
Functions of Plasma Membranes
Cytoplasm: Cytosol, Organelles
Functions of Cytoplasm
Ribosome, Functions of Ribosomes
2. Endoplasmic reticulum (ER)
a. Rough Endoplasmic Reticulum and its Functions
b. Smooth ER and its Functions
3. Golgi complex and its Functions
4.Lysosomes and its Functions
5. Peroxisomes and its Functions
6. Proteasomes and its Functions
7.Mitochondria and its Functions
8. Cytoskeletal
a. Microfilaments and its Functions
b. Intermediate filaments and its Functions
c. Microtubules and its Functions
9. Centrosome and its Functions
10. Cilia and Flagella and its Functions
11. Nucleus and its Functions
a. Nuclear Membrane and its Functions
b. Nucleoplasm and its Functions
c. Chromosomes and its Functions
d. Nucleolus and its Functions
The cell membrane is composed of a lipid bilayer with embedded proteins. The lipid bilayer is fluid and allows only fat-soluble substances to pass through. Integral proteins span the membrane while peripheral proteins are attached to surfaces. Membrane proteins function in transport, structure, signaling and more. Carbohydrates attached to proteins and lipids form the glycocalyx and function in cell recognition and selective permeability. The cell membrane protects the cell, regulates what enters and exits, and maintains the cell's shape and size.
The document describes the main organelles found in animal cells including their structures, locations within the cell, and functions. The organelles discussed are the nucleus, ribosomes, endoplasmic reticulum, Golgi apparatus, mitochondria, lysosomes, and peroxisomes. Each organelle plays an important role such as generating energy, modifying and transporting proteins, breaking down waste, and carrying genetic instructions.
The document summarizes key organelles and structures found within eukaryotic cells, including:
1) The cytosol is the jelly-like material within the cell cytoplasm with dissolved substances like amino acids.
2) The nucleus contains the cell's DNA and controls the cell. Inside is the nucleolus which makes ribosomes.
3) Mitochondria convert food into ATP for energy in most eukaryotic cells, with more in muscle cells. They have inner and outer membranes.
4) The endoplasmic reticulum synthesizes proteins and lipids, with ribosomes on the rough ER and no ribosomes on the smooth ER.
This provides a high-level overview of
Biology Class 11 Chapter 8
FOR FURTHER DETAILS YOU CAN WATCH THE RELATED VIDEO AT THE GIVEN LINK
https://www.youtube.com/channel/UCxo06Nj-QWo_7SNvMyDnJCQ?view_as=subscriber
The document summarizes the key components of the cell including the plasma membrane, cytoplasm, and nucleus. It provides details on the structure and functions of the plasma membrane, including the lipid bilayer structure and roles of membrane proteins. It then describes the two main parts of the cytoplasm - the cytosol and organelles within it. Specific organelles are outlined like the endoplasmic reticulum, Golgi complex, lysosomes, and peroxisomes. The nucleus is noted as housing the cell's DNA within chromosomes.
All organisms are composed of cells, which are the basic unit of life. Most cells are small, around 1-10 micrometers, and can only be seen under a microscope. Cells come in various shapes and sizes and perform specialized functions. They contain organelles that carry out different tasks to keep the cell functioning. The nucleus houses genetic material and controls cellular activities, while other organelles like mitochondria produce energy and the endoplasmic reticulum and Golgi apparatus modify and transport cellular products.
Cell was first discovered in 1665 by Robert Hooke, who observed cork slices under his microscope and saw they resembled a honeycomb structure. There are two main types of cells: prokaryotic and eukaryotic. Prokaryotic cells are smaller and lack organelles, while eukaryotic cells are larger and have organelles like the nucleus. Organisms can also be unicellular, consisting of a single cell, or multicellular, made of many cells. The basic components of cells include the cell membrane, nucleus, cytoplasm, and various organelles that carry out specific functions to keep the cell alive.
This document discusses cell structure, function, and cellular transport. It begins by defining the cell and outlining the three main points of the cell theory: 1) all living things are made of cells, 2) new cells are produced from existing cells, and 3) the cell is the basic unit of structure and function. It then describes the structure and functions of key cellular components like the plasma membrane, nucleus, cytoplasm, organelles, and ribosomes. The final section discusses cellular transport mechanisms, distinguishing between passive transport (diffusion and osmosis) which moves substances down concentration gradients without energy input, and active transport which requires ATP and transports substances against gradients.
The document discusses the structure and function of cells. It describes the key compartments of cells including the plasma membrane, cytoplasm, mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, peroxisomes, cytoskeleton, and nucleus. The major functions of these compartments are transport of ions and molecules, metabolism of carbohydrates lipids and amino acids, energy production, synthesis of proteins and lipids, modification and sorting of proteins, cellular digestion, utilization of hydrogen peroxide, cell morphology and motility, and DNA synthesis and repair.
The document discusses the structure and function of cells. It describes the key components of cells including the plasma membrane, cytoplasm, organelles like mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, peroxisomes, cytoskeleton, and nucleus. The major functions of these components are transport of molecules, metabolism, energy production, synthesis of proteins and lipids, modification and sorting of proteins, cellular digestion, utilization of hydrogen peroxide, cell morphology and motility, and DNA synthesis and repair.
The Cell........................................................................mariafermani1
The document summarizes key aspects of cell biology. It begins by outlining cell theory and distinguishing between eukaryotic and prokaryotic cells. It then describes several organelles found in eukaryotic cells including the nucleus, mitochondria, lysosomes, endoplasmic reticulum, Golgi apparatus, peroxisomes, and cytoskeleton. It also discusses tissue formation, classification of prokaryotic cells, and the structure and function of bacterial and viral cells.
This document provides an overview of cell structure and function. It begins with the cell theory proposed by Matthias Schleiden and Theodore Schwann stating that all living organisms are made of cells, the cell is the basic unit of life, and new cells are formed from existing cells. It then discusses the organization of eukaryotic cells, including the nucleus, cytoplasm, organelles like mitochondria, endoplasmic reticulum, Golgi apparatus, and lysosomes. The document also covers intercellular junctions, the physical structure of the cell membrane, and processes of endocytosis, pinocytosis, and phagocytosis.
2 Plant Cell physiology and their role ttBhim Joshi
The document provides information on the structure and functions of plant cells. It discusses the key components of plant cells including the cell wall, cell membrane, cytoplasm, vacuoles, mitochondria, plastids, endoplasmic reticulum, ribosomes, Golgi bodies, lysosomes and nucleus. The cell wall provides shape and protection, while the cell membrane regulates what enters and exits the cell. The cytoplasm contains organelles that carry out important processes like respiration, photosynthesis, protein synthesis, and waste removal. The vacuole stores water, nutrients and pigments.
This document summarizes key aspects of cell biology. It describes the structures and functions of eukaryotic cells including cell organelles like the nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, lysosomes, and vacuoles. It also compares the key differences between prokaryotic and eukaryotic cells, noting that eukaryotic cells are generally larger, have a nucleus bounded by a nuclear envelope, and contain membrane-bound organelles, while prokaryotic cells lack these structures. The document provides details on the composition and functions of important cell structures like the cell membrane, cell wall, and cytoplasm.
The document provides information on the structure and functions of various cell organelles. It discusses the cell membrane, cytoplasm, and nucleus. Within the cytoplasm, it describes the organelles with limiting membranes like the endoplasmic reticulum, Golgi apparatus, lysosomes, peroxisomes, centrosomes, mitochondria and those without limiting membranes like ribosomes and cytoskeleton. Each organelle is described in terms of its structure, composition, location within the cell and specific functions. The document serves as a comprehensive guide to the essential components within the cell and their roles in maintaining cellular activities.
This document provides an overview of cellular structure and function. It begins with definitions of the cell and its components, including the plasma membrane, cytoplasm, organelles like the nucleus, mitochondria and Golgi apparatus. It then discusses cellular transport mechanisms, both passive (diffusion, osmosis, filtration) and active. The functions of the cell are outlined, including structure, growth, transport, energy production and metabolism. Finally, it briefly describes the four main types of cell junctions - tight junctions, adherens junctions, desmosomes and gap junctions.
This document summarizes the organelles found in eukaryotic cells and their functions. It describes the nucleus, which controls the cell and stores DNA; the cytoplasm, where most chemical reactions occur; the cell membrane, which regulates what enters and exits the cell; and other organelles like the endoplasmic reticulum, Golgi apparatus, mitochondria, ribosomes, lysosomes, centrioles, cytoskeleton, cilia, and flagella. Each organelle has a specific structure and role in the cell.
This document provides information on cells at both the prokaryotic and eukaryotic levels. It discusses cell theory and key aspects of prokaryotic cells including their shape, structures like plasmids and mesosomes, and cell envelopes. For eukaryotic cells, it describes the membrane-bound organelles like the nucleus, mitochondria, plastids, Golgi apparatus, endoplasmic reticulum, lysosomes and vacuoles. It also discusses cytoskeletal elements and membrane properties.
This presentation file contains all about cell discovery, cell theory, organelles which are present within the cell and cell comparison between prokaryotic and Eukaryotic organisms.
this presentation providing about the cell .Cell is the basic living, structural, and functional unit of the body.
Cells are grouped together to form tissues, each of which has a specialized function, e.g.- Bone and blood tissue.
Different tissues are grouped together to form a organs, e.g. liver, stomach, and kidney etc.
Organs are grouped together to form a system, each of which performs a particular function responsible for maintaining homeostasis .
e.g. Urinary system, Respiratory system etc.
1. The document summarizes the structure and function of cells and their organelles. It describes the key components of cells, including the cell membrane, cytoplasm, nucleus, and various organelles like mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, ribosomes, cytoskeleton, vacuoles, and centrioles.
2. It explains that cells are the basic structural and functional units of life, and outlines the modern cell theory. It provides details on the structures and functions of major cell organelles involved in various processes like protein synthesis, energy production, transport, and waste disposal.
3. The document is intended as an overview of cell anatomy and the roles of intracellular components.
The document provides information on cell structure and various cell organelles. It discusses the nucleus, noting its spherical shape and presence of nuclear pores that control movement between the nucleus and cytoplasm. The endoplasmic reticulum is described as a network of membranes involved in synthesis, storage and transport. The Golgi complex packages and modifies proteins and lipids. Lysosomes and peroxisomes are involved in digestion and detoxification, while mitochondria produce energy through ATP synthesis and have a role in apoptosis.
The document summarizes the structure and function of the cell and its organelles. It discusses that the cell is the basic unit of life and contains a cell membrane and cytoplasm. It then describes the structure and functions of the cell membrane, nucleus, endoplasmic reticulum, ribosomes, Golgi apparatus, mitochondria, lysosomes, centrioles, and microtubules. The key roles of these organelles in protein synthesis, energy production, waste disposal, and cell division are highlighted.
The document discusses the fundamental unit of life - the cell. It describes the key components of cells including the plasma membrane, cytoplasm, organelles like mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, peroxisomes, and cytoskeleton. It also discusses the nucleus. The main functions of these components are to transport ions and molecules, carry out metabolism of carbohydrates, lipids and amino acids, produce energy, synthesize proteins and lipids, modify and sort proteins, aid in cellular digestion, utilize hydrogen peroxide, maintain cell morphology and enable cell motility, and facilitate DNA synthesis and repair.
The document describes the structure and functions of the major components of the cell, including the plasma membrane, cytoplasm, organelles, cytoskeleton, and nucleus. It discusses how the plasma membrane regulates the passage of molecules in and out of the cell and links cells together. It explains that the cytoplasm contains cytosol and various organelles, such as mitochondria, which produce energy, and the endoplasmic reticulum and Golgi apparatus, which are involved in protein synthesis and modification. The nucleus contains the genetic material and controls gene expression. Overall, the document provides an overview of the basic constituents of the cell and their roles in important cellular processes.
The document describes the structure and functions of the major components of the cell, including the plasma membrane, cytoplasm, organelles, cytoskeleton, and nucleus. It discusses how the plasma membrane regulates the passage of molecules in and out of the cell and links cells together. It explains that the cytoplasm contains cytosol and various organelles, such as mitochondria, which produce energy, and the endoplasmic reticulum and Golgi apparatus, which are involved in protein synthesis and modification. The nucleus contains the genetic material and controls gene expression. Overall, the document provides an overview of the basic constituents of the cell and their roles in important cellular processes.
Parabolic antenna alignment system with Real-Time Angle Position FeedbackStevenPatrick17
Introduction
Parabolic antennas are a crucial component in many communication systems, including satellite communications, radio telescopes, and television broadcasting. Ensuring these antennas are properly aligned is vital for optimal performance and signal strength. A parabolic antenna alignment system, equipped with real-time angle position feedback and fault tracking, is designed to address this need. This document delves into the components, design, and implementation of such a system, highlighting its significance and applications.
Importance of Parabolic Antenna Alignment
The alignment of a parabolic antenna directly affects its performance. Even minor misalignments can lead to significant signal loss, which can degrade the quality of the received signal or cause communication failures. Proper alignment ensures that the antenna's focal point is accurately directed toward the signal source, maximizing the antenna's gain and efficiency. This precision is especially crucial in applications like satellite communications, where the antenna must track geostationary satellites with high accuracy.
Components of a Parabolic Antenna Alignment System
A parabolic antenna alignment system typically includes the following components:
Parabolic Dish: The primary reflector that collects and focuses incoming signals.
Feedhorn and Low Noise Block (LNB): Positioned at the dish's focal point to receive signals.
Stepper or Servo Motors: Adjust the azimuth (horizontal) and elevation (vertical) angles of the antenna.
Microcontroller (e.g., Arduino, Raspberry Pi): Processes sensor data and controls the motors.
Potentiometers: Provide feedback on the antenna's current angle positions.
Fault Detection Sensors: Monitor for potential faults such as cable discontinuities or LNB failures.
Control Software: Runs on the microcontroller, handling real-time processing and decision-making.
Real-Time Angle Position Feedback
Real-time feedback on the antenna's angle position is essential for maintaining precise alignment. This feedback is typically provided by potentiometers or rotary encoders, which continuously monitor the azimuth and elevation angles. The microcontroller reads this data and adjusts the motors accordingly to keep the antenna aligned with the signal source.
Fault Tracking in Antenna Alignment Systems
Fault tracking is vital for the reliability and performance of the antenna system. Common faults include cable discontinuities, LNB malfunctions, and motor failures. Sensors integrated into the system can detect these faults and either notify the user or initiate corrective actions automatically.
Design and Implementation
1. Parabolic Dish and Feedhorn
The parabolic dish is designed to reflect incoming signals to a focal point where the feedhorn and LNB are located. The dish's size and shape depend on the specific application and frequency range.
2. Motors and Position Control
Stepper motors or servo motors are used to control the azimuth and elevation of
Cell was first discovered in 1665 by Robert Hooke, who observed cork slices under his microscope and saw they resembled a honeycomb structure. There are two main types of cells: prokaryotic and eukaryotic. Prokaryotic cells are smaller and lack organelles, while eukaryotic cells are larger and have organelles like the nucleus. Organisms can also be unicellular, consisting of a single cell, or multicellular, made of many cells. The basic components of cells include the cell membrane, nucleus, cytoplasm, and various organelles that carry out specific functions to keep the cell alive.
This document discusses cell structure, function, and cellular transport. It begins by defining the cell and outlining the three main points of the cell theory: 1) all living things are made of cells, 2) new cells are produced from existing cells, and 3) the cell is the basic unit of structure and function. It then describes the structure and functions of key cellular components like the plasma membrane, nucleus, cytoplasm, organelles, and ribosomes. The final section discusses cellular transport mechanisms, distinguishing between passive transport (diffusion and osmosis) which moves substances down concentration gradients without energy input, and active transport which requires ATP and transports substances against gradients.
The document discusses the structure and function of cells. It describes the key compartments of cells including the plasma membrane, cytoplasm, mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, peroxisomes, cytoskeleton, and nucleus. The major functions of these compartments are transport of ions and molecules, metabolism of carbohydrates lipids and amino acids, energy production, synthesis of proteins and lipids, modification and sorting of proteins, cellular digestion, utilization of hydrogen peroxide, cell morphology and motility, and DNA synthesis and repair.
The document discusses the structure and function of cells. It describes the key components of cells including the plasma membrane, cytoplasm, organelles like mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, peroxisomes, cytoskeleton, and nucleus. The major functions of these components are transport of molecules, metabolism, energy production, synthesis of proteins and lipids, modification and sorting of proteins, cellular digestion, utilization of hydrogen peroxide, cell morphology and motility, and DNA synthesis and repair.
The Cell........................................................................mariafermani1
The document summarizes key aspects of cell biology. It begins by outlining cell theory and distinguishing between eukaryotic and prokaryotic cells. It then describes several organelles found in eukaryotic cells including the nucleus, mitochondria, lysosomes, endoplasmic reticulum, Golgi apparatus, peroxisomes, and cytoskeleton. It also discusses tissue formation, classification of prokaryotic cells, and the structure and function of bacterial and viral cells.
This document provides an overview of cell structure and function. It begins with the cell theory proposed by Matthias Schleiden and Theodore Schwann stating that all living organisms are made of cells, the cell is the basic unit of life, and new cells are formed from existing cells. It then discusses the organization of eukaryotic cells, including the nucleus, cytoplasm, organelles like mitochondria, endoplasmic reticulum, Golgi apparatus, and lysosomes. The document also covers intercellular junctions, the physical structure of the cell membrane, and processes of endocytosis, pinocytosis, and phagocytosis.
2 Plant Cell physiology and their role ttBhim Joshi
The document provides information on the structure and functions of plant cells. It discusses the key components of plant cells including the cell wall, cell membrane, cytoplasm, vacuoles, mitochondria, plastids, endoplasmic reticulum, ribosomes, Golgi bodies, lysosomes and nucleus. The cell wall provides shape and protection, while the cell membrane regulates what enters and exits the cell. The cytoplasm contains organelles that carry out important processes like respiration, photosynthesis, protein synthesis, and waste removal. The vacuole stores water, nutrients and pigments.
This document summarizes key aspects of cell biology. It describes the structures and functions of eukaryotic cells including cell organelles like the nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, lysosomes, and vacuoles. It also compares the key differences between prokaryotic and eukaryotic cells, noting that eukaryotic cells are generally larger, have a nucleus bounded by a nuclear envelope, and contain membrane-bound organelles, while prokaryotic cells lack these structures. The document provides details on the composition and functions of important cell structures like the cell membrane, cell wall, and cytoplasm.
The document provides information on the structure and functions of various cell organelles. It discusses the cell membrane, cytoplasm, and nucleus. Within the cytoplasm, it describes the organelles with limiting membranes like the endoplasmic reticulum, Golgi apparatus, lysosomes, peroxisomes, centrosomes, mitochondria and those without limiting membranes like ribosomes and cytoskeleton. Each organelle is described in terms of its structure, composition, location within the cell and specific functions. The document serves as a comprehensive guide to the essential components within the cell and their roles in maintaining cellular activities.
This document provides an overview of cellular structure and function. It begins with definitions of the cell and its components, including the plasma membrane, cytoplasm, organelles like the nucleus, mitochondria and Golgi apparatus. It then discusses cellular transport mechanisms, both passive (diffusion, osmosis, filtration) and active. The functions of the cell are outlined, including structure, growth, transport, energy production and metabolism. Finally, it briefly describes the four main types of cell junctions - tight junctions, adherens junctions, desmosomes and gap junctions.
This document summarizes the organelles found in eukaryotic cells and their functions. It describes the nucleus, which controls the cell and stores DNA; the cytoplasm, where most chemical reactions occur; the cell membrane, which regulates what enters and exits the cell; and other organelles like the endoplasmic reticulum, Golgi apparatus, mitochondria, ribosomes, lysosomes, centrioles, cytoskeleton, cilia, and flagella. Each organelle has a specific structure and role in the cell.
This document provides information on cells at both the prokaryotic and eukaryotic levels. It discusses cell theory and key aspects of prokaryotic cells including their shape, structures like plasmids and mesosomes, and cell envelopes. For eukaryotic cells, it describes the membrane-bound organelles like the nucleus, mitochondria, plastids, Golgi apparatus, endoplasmic reticulum, lysosomes and vacuoles. It also discusses cytoskeletal elements and membrane properties.
This presentation file contains all about cell discovery, cell theory, organelles which are present within the cell and cell comparison between prokaryotic and Eukaryotic organisms.
this presentation providing about the cell .Cell is the basic living, structural, and functional unit of the body.
Cells are grouped together to form tissues, each of which has a specialized function, e.g.- Bone and blood tissue.
Different tissues are grouped together to form a organs, e.g. liver, stomach, and kidney etc.
Organs are grouped together to form a system, each of which performs a particular function responsible for maintaining homeostasis .
e.g. Urinary system, Respiratory system etc.
1. The document summarizes the structure and function of cells and their organelles. It describes the key components of cells, including the cell membrane, cytoplasm, nucleus, and various organelles like mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, ribosomes, cytoskeleton, vacuoles, and centrioles.
2. It explains that cells are the basic structural and functional units of life, and outlines the modern cell theory. It provides details on the structures and functions of major cell organelles involved in various processes like protein synthesis, energy production, transport, and waste disposal.
3. The document is intended as an overview of cell anatomy and the roles of intracellular components.
The document provides information on cell structure and various cell organelles. It discusses the nucleus, noting its spherical shape and presence of nuclear pores that control movement between the nucleus and cytoplasm. The endoplasmic reticulum is described as a network of membranes involved in synthesis, storage and transport. The Golgi complex packages and modifies proteins and lipids. Lysosomes and peroxisomes are involved in digestion and detoxification, while mitochondria produce energy through ATP synthesis and have a role in apoptosis.
The document summarizes the structure and function of the cell and its organelles. It discusses that the cell is the basic unit of life and contains a cell membrane and cytoplasm. It then describes the structure and functions of the cell membrane, nucleus, endoplasmic reticulum, ribosomes, Golgi apparatus, mitochondria, lysosomes, centrioles, and microtubules. The key roles of these organelles in protein synthesis, energy production, waste disposal, and cell division are highlighted.
The document discusses the fundamental unit of life - the cell. It describes the key components of cells including the plasma membrane, cytoplasm, organelles like mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, peroxisomes, and cytoskeleton. It also discusses the nucleus. The main functions of these components are to transport ions and molecules, carry out metabolism of carbohydrates, lipids and amino acids, produce energy, synthesize proteins and lipids, modify and sort proteins, aid in cellular digestion, utilize hydrogen peroxide, maintain cell morphology and enable cell motility, and facilitate DNA synthesis and repair.
The document describes the structure and functions of the major components of the cell, including the plasma membrane, cytoplasm, organelles, cytoskeleton, and nucleus. It discusses how the plasma membrane regulates the passage of molecules in and out of the cell and links cells together. It explains that the cytoplasm contains cytosol and various organelles, such as mitochondria, which produce energy, and the endoplasmic reticulum and Golgi apparatus, which are involved in protein synthesis and modification. The nucleus contains the genetic material and controls gene expression. Overall, the document provides an overview of the basic constituents of the cell and their roles in important cellular processes.
The document describes the structure and functions of the major components of the cell, including the plasma membrane, cytoplasm, organelles, cytoskeleton, and nucleus. It discusses how the plasma membrane regulates the passage of molecules in and out of the cell and links cells together. It explains that the cytoplasm contains cytosol and various organelles, such as mitochondria, which produce energy, and the endoplasmic reticulum and Golgi apparatus, which are involved in protein synthesis and modification. The nucleus contains the genetic material and controls gene expression. Overall, the document provides an overview of the basic constituents of the cell and their roles in important cellular processes.
Parabolic antenna alignment system with Real-Time Angle Position FeedbackStevenPatrick17
Introduction
Parabolic antennas are a crucial component in many communication systems, including satellite communications, radio telescopes, and television broadcasting. Ensuring these antennas are properly aligned is vital for optimal performance and signal strength. A parabolic antenna alignment system, equipped with real-time angle position feedback and fault tracking, is designed to address this need. This document delves into the components, design, and implementation of such a system, highlighting its significance and applications.
Importance of Parabolic Antenna Alignment
The alignment of a parabolic antenna directly affects its performance. Even minor misalignments can lead to significant signal loss, which can degrade the quality of the received signal or cause communication failures. Proper alignment ensures that the antenna's focal point is accurately directed toward the signal source, maximizing the antenna's gain and efficiency. This precision is especially crucial in applications like satellite communications, where the antenna must track geostationary satellites with high accuracy.
Components of a Parabolic Antenna Alignment System
A parabolic antenna alignment system typically includes the following components:
Parabolic Dish: The primary reflector that collects and focuses incoming signals.
Feedhorn and Low Noise Block (LNB): Positioned at the dish's focal point to receive signals.
Stepper or Servo Motors: Adjust the azimuth (horizontal) and elevation (vertical) angles of the antenna.
Microcontroller (e.g., Arduino, Raspberry Pi): Processes sensor data and controls the motors.
Potentiometers: Provide feedback on the antenna's current angle positions.
Fault Detection Sensors: Monitor for potential faults such as cable discontinuities or LNB failures.
Control Software: Runs on the microcontroller, handling real-time processing and decision-making.
Real-Time Angle Position Feedback
Real-time feedback on the antenna's angle position is essential for maintaining precise alignment. This feedback is typically provided by potentiometers or rotary encoders, which continuously monitor the azimuth and elevation angles. The microcontroller reads this data and adjusts the motors accordingly to keep the antenna aligned with the signal source.
Fault Tracking in Antenna Alignment Systems
Fault tracking is vital for the reliability and performance of the antenna system. Common faults include cable discontinuities, LNB malfunctions, and motor failures. Sensors integrated into the system can detect these faults and either notify the user or initiate corrective actions automatically.
Design and Implementation
1. Parabolic Dish and Feedhorn
The parabolic dish is designed to reflect incoming signals to a focal point where the feedhorn and LNB are located. The dish's size and shape depend on the specific application and frequency range.
2. Motors and Position Control
Stepper motors or servo motors are used to control the azimuth and elevation of
1. The Cell
Cell: is the structural and functional unit of life (and of disease processes). Cell also defines
as the smallest unit of protoplasm than can exist independently and reproduce its kind.
Human being possesses billions of cells, arranged in more than 200 types ,but on the
functional similarities, theses cells are classified into 4 basic groups: epithelial, connective,
muscular and nervous tissues.
2. The cell either:
• Eu-karoytic : contain nuclei.
• Pro-karotic : contain no nuclear envelop, no histones and no membranous
organells.
3.
4.
5. A- The cytoplasm
1. Cytoplasmic matrix ( cell sap): it is a colloidal gel-like solution of proteins, lipids,
carbohydrates, minerals, enzymes, small molecules, and ions.
2. Cytoplasmic organelles (organoids): these are specialized structures with specific
functions, and they can be enclosed in membranes (membranous organelles) or not (non-
membranes organelles).
3. Cytoplasmic Inclusions: these are
temporary, non-living components
which appear and disappear at
different periods in certain cells,
such as stored food(glycogen, fat),
Pigments(exogenous & endogenous)
and crystals.
6. Cell Organelles(Organoids)
Membranous organelles: these are permanent components, present in all nucleated
cells, and included:
1. Cell membrane(plasma membrane or plasmalemma).
2. Mitochondria.
3. Golgi Apparatus.
4. Lysosomes.
5. Rough Endoplasmic Reticulum (RER).
6. Smooth Endoplasmic Reticulum (SER).
7. Peroxisomes.
7. 1-Cell membrane(plasma membrane or plasmalemma):
Is the boundary that separates the living cell from it’s non-living surroundings.
Thickness: 7.5-10 nm(75-100 Angstrom) and consequently is visible only in electron
microscope, where it appears as if it’s formed of three layers, therefore it’s called
tri-lamellare membrane. Its outer and inner layers appear as dark lines, while its
middle layer appears as a light area.
9. 1-Lipids
a. Phospholipids: It’s composed of:
i. Phosphate head:
• Has affinity for aqueous solution (hydrophilic )
• It's the charged polar head
• Directed outwards
ii. Fatty acid tails:
Has no affinity for aqueous solution (hydrophobic )
It's the non- polar (not charged )tail
Directed inwards
Phosphate head
Fatty acid
Arranged as a bilayer
10. b. Cholesterol: fit into spaces between phospholipids and prevent water-soluble
molecules from diffusing across the membrane.
11. 2- Protein molecules
a. Extrinsic or Peripheral protein:
Lie outside lipid bilayer
forms a non-continuous layer loosely bound to both surface of membrane.
b. Intrinsic or Integral proteins:
-Small intrinsic proteins: small proteins embedded in the lipid bilayer.
-Large intrinsic proteins: called trans membrane proteins, they contain channels
through which ions can pass.
trans membrane proteins
Peripheral protein
12. Functions of membrane proteins
Outside
Plasma
membrane
Inside
Transporter Cell surface
receptor
Enzyme
activity
Cell surface
identity marker
Attachment to the
cytoskeleton
Cell adhesion
“Antigen”
“Channel”
13. 3- Carbohydrates molecules
Membrane carbohydrates either linked to the protein molecules forming glycoproteins or to
lipid forming glycolipids.
Glycoproteins + Glycolipids = Glycocalyx (Cell Coat), it may be thick or thin according to
function of cell.It helps in adhesion adjacent cells and enables cells to recognize other cells
of their own special kind. ABO antigen. Form part of the basement membrane
Cell adhesion Cell surface identity marker
Dr.
Sabah
A.
AL-Qadasi
14. The functions of the cell membrane
1. protects the cell by acting as a barrier
2. regulates the transport of substances in and out of the cell(active transport,
selective transport, phagocytosis, pinocytosis and exocytosis)
3. receives chemical messages from other cell
4. acts as receptors
5. cell mobility, secretions, and absorptions of substances
15.
16. 2-Endoplamic Reticulum(ER):
They are membranous cell organelles formed of communicating wide and narrow
tubules (cisternae).
They synthesize protein, carbohydrates, lipid and regulate mineral metabolism.
They are 2 types of ER: Rough and Smooth
i. Rough Endoplasmic Reticulum(RER):
is studded with ribosomes and is the site of protein synthesis and processing.
They are basophilic substances (stains well with basic stains)
Their number increases in protein
secreting cells such as fibroblast, plasma
cell,ameloblast, hepatic and pancreatic cells
Protects the cytoplasm from the action
Of the hydrolytic enzyme.
17. ii. Smooth Endoplasmic Reticulum(SER):
Can’t demonstrated by LM, while by EM
With EM it appears as anastomosing tubules with no ribosomes.
It’s the site of phospholipids and carbohydrates synthesis
Fund in great amount in endocrine cells which synthesize steroid hormones.
Regulates muscles contraction (calcium ions).
Play role in platelets formation
Play role in HCL formation
Detoxification of excess
drugs or hormones
18. 3- Golgi Apparatus:
The Golgi structure is a smooth, curvy structure. It is a flattened stack of membranes.
It has a front end and a back end.
The front end is called the cis face and the back end is called the trans face.
Golgi apparatus has cisternae which are the flattened membrane folds and secretory
vesicles which are what the cell discharges.
Golgi apparatus is responsible for collecting, concentrating, packaging, sorting and
adding specific products to the secretion.
By TEM
19. • In nerve cells it surrounds the nucleus, while in secretory epithelial cells it’s found
between the nucleus and cells free border.
• With silver stain: it appears as brown
fibrillar or granular network called positive image.
• With H&E: it appears as an unstained area called
negative image in a highly basophilic cells
(e.g. plasma cells).
• With EM: it has 3 forms:
i. Saccules: small sacks arranged one above the other to form stacks.
Each stack has concave mature face and a convex immature face.
ii. Transfer vesicles: small round membranous vesicles containing protein and originate
from RER.
Transfer vesicles fuse with saccules of immature convex face.
20. iii. Secretor vesicles: when transfer vesicles are concentrated and enveloped by
membrane they known as secretory vesicles.
They arise from the periphery of saccules. Secretory vesicles are discharged outside the
cell by exocytosis, others remain intracellular as lysosomes.
Functions of Golgi apparatus:
1. Accumulate, concentrate and package secretory products of cells.
2. Rich in sulfotransferase enzyme which adds sulfates to certain secretory products.
3. Rich in sugar transferase enzyme which adds carbohydrates to certain secretory
products.
4. Keep cell membranes and cell coat in good condition.
21. 4- Lysosomes:
• Lysosomes are enzyme-filled sacs, generally spherical, surrounded by a single membrane,
present in all kind of the cells.
• Their main function is an intracellular digestion.
• They are very common in white blood cells, where disease and sickness are fought so a
lot of bacteria needs to be digested.
• Their shape and size vary depending on what material is digested.
• They contain about 40 different enzymes (ex. nucleases, proteases, lipases, and
carbohydrases, phosphatase).
22. With EM they appear in 2 forms:
i. Primary lysosomes: homogeneous rounded vesicle.
ii. Secondary lysosomes: heterogeneous rounded
bodies because they contain ingested and digested elements.
Fate of the primary lysosomes:
These are newly formed lysosomes which have budded off from the Golgi apparatus.
They may circulate in cytoplasm and remain such as or fuse with some foreign particles or
cytoplasmic bodies like old organelles to form secondary lysosomes.
23. Secondary lysosomes formed through the following processes:
1. Phagocytosis: (cell eating) the phagocytosed foreign bodies (phagosomes) fused with
primary lysosomes to form digestive vacuole.
2.Pinocytosis: (cell drinking) the pinocytosed foreign bodies (pinocytic vesicles) fused with
primary lysosomes to form multivesicular body.
3. Autophagocytosis: old membrane bound mitochondria fused with primary lysosomes to
form autophagic vacuole. They may be expelled by exocytosis or remain in cytoplasm.
4. Residual bodies: after digestion of the contents of secondary lysosomes diffuse into the
cytoplasm, the remaining vacuole is called
residual body. They may be expelled by
exocytosis or remain in cytoplasm.
Long lifespan cells (nerve& cardiac cells)
contain many residual bodies (lipofuscin) .
They may be expelled by exocytosis or
remain in cytoplasm.
24. Functions of the lysosomes:
1. Intracellular digestion
2. Defense the body against invading organisms
3. Digest old mitochondria
4. Facilitate penetration of sperm into the oocyte
5. Concerned with post-mortem changes (suicide bags) such as hypoxia, ischemia and
bacterial infection.
25. 5- Mitochondria(The Powerhouse) :
• Mitos= thread + chondrons = granules, so with LM they appear as rods, granules or
filaments.
• With EM they appear as vesicles surrounded by 2 membranes; an outer smooth, and an
inner rough because it projects into the cavity of the mitochondrion forming shelves called
cristae which increase the surface area.
• Mitochondrial matrix contains respiratory apparatus, DNA &RNA , ribosomes, calcium and
magnesium granules.
• Mitochondrion has its own
strand of DNA, so they can
divide to increase their number.
• They are concerned with
oxidative phosphorylation and ATP
production and also play role in lipid synthesis (except in RBCs)
26. • Each cell contains a different number of mitochondria. The number present is
dependent upon how much energy the cell requires. The more energy a cell needs the
more mitochondria that will be present. Cells have the ability to produce more
mitochondria as needed.
• Mitochondria are in constant movement and they are able to expand, contract, divide
and fuse to make larger ones (giant mitochondrion) .
• They are sensitive to temperature, PH, osmotic pressure.
• Their life span is about 10 days.
Functions of the mitochondria:
1. Supply energy (ATP) to all cellular activities.
2. Storage of calcium and magnesium ions as dark granules.
3. Catalyze the enzymatic reactions of mitochondria.
4. Play role in lipid synthesis.
27. 6- Peroxisomes or Microbodies:
• Peroxidase are self-replicating organelles that contain oxidative enzymes.
• They are somewhat larger than primary lysosomes.
• In rats, they are distinguishable from lysosomes by an electron-dense granule nucleoid of
urate oxidase
• They contain more than 40 oxidative enzymes, especially urate oxidase, D-amino acid
oxidase, hydroxyacid oxidase, and catalase.
Functions of Peroxisomes:
Hydrogen peroxidase (H2O2) degradation: beta oxidation of long chained fatty acids
produces H2O2 a potentially toxic substance to cells that must be eliminated.
Peroxisomes contain catalase enzyme which destroys H2O2. Excess H2O2 that accumulates in
cells from other sources can also be eliminated by peroxisomes.