This document provides an overview of microtomy, which is the process of cutting thin sections of tissue for microscopic examination. It discusses the history and types of microtomes, including rocking, rotary, base-sledge, sliding, vibrating, freezing, saw, cryostat, ultra, and laser microtomes. For each type, the key features and mechanisms are described. It also covers the different parts of microtomes like the knife, block and knife holders. Finally, it discusses the various knife profiles, materials, angles and their applications in microtomy.
Centrifugation is a widely used technique for separating mixtures of substances based on density. It involves placing a mixture in a centrifuge that spins it at high speeds, applying centrifugal force to separate components. There are various types of centrifuges for different applications in fields like biochemistry, pharmaceuticals, and more. Centrifugation plays an important role in both industrial processes like oil extraction and biological areas like blood analysis.
Centrifugation is a technique that uses centrifugal force to separate components of a solution based on properties like density, size, and shape. It works by spinning the solution at high speeds, allowing heavier components to sediment to the bottom. There are two main types - density gradient centrifugation, where particles separate through a density gradient, and differential centrifugation, which separates organelles from cells. Centrifugation has many applications, including separating cream from milk, clarifying wine, and purifying proteins and cells.
Centrifugation uses centrifugal force to separate mixtures based on density. There are several types of centrifuges that differ in maximum speed and other features. Desktop centrifuges have the lowest maximum speed below 3000rpm, while ultracentrifuges can reach speeds over 75,000rpm. Centrifuges consist of a drive motor, temperature control, vacuum, and rotors. Sedimentation velocity separates mixtures in a shallow gradient over a short time, while sedimentation equilibrium separates mixtures to their equilibrium positions in a steep gradient over prolonged high-speed centrifugation.
This document discusses biological species and speciation. It defines a biological species as members of a population that can breed and produce fertile offspring. It describes reproductive isolating mechanisms that prevent interbreeding between species, including prezygotic mechanisms like behavioral, temporal, ecological, mechanical, and gametic isolation and postzygotic mechanisms like zygotic mortality, hybrid inviability, and hybrid infertility. Speciation occurs through allopatric speciation by physical separation of populations or sympatric speciation within a single population through disruptive selection on extreme traits.
Centrifugation is a process that uses centrifugal force to separate mixtures based on density. It works by spinning a liquid sample at high speeds, causing denser components to migrate outward and separate from less dense components. There are several types of centrifugation including density gradient centrifugation, differential centrifugation, and ultracentrifugation. Centrifugation has many applications such as separating immiscible liquids, purifying cells, and separating blood components.
This document provides an overview of microtomy, which is the process of cutting thin sections of tissue for microscopic examination. It discusses the history and types of microtomes, including rocking, rotary, base-sledge, sliding, vibrating, freezing, saw, cryostat, ultra, and laser microtomes. For each type, the key features and mechanisms are described. It also covers the different parts of microtomes like the knife, block and knife holders. Finally, it discusses the various knife profiles, materials, angles and their applications in microtomy.
Centrifugation is a widely used technique for separating mixtures of substances based on density. It involves placing a mixture in a centrifuge that spins it at high speeds, applying centrifugal force to separate components. There are various types of centrifuges for different applications in fields like biochemistry, pharmaceuticals, and more. Centrifugation plays an important role in both industrial processes like oil extraction and biological areas like blood analysis.
Centrifugation is a technique that uses centrifugal force to separate components of a solution based on properties like density, size, and shape. It works by spinning the solution at high speeds, allowing heavier components to sediment to the bottom. There are two main types - density gradient centrifugation, where particles separate through a density gradient, and differential centrifugation, which separates organelles from cells. Centrifugation has many applications, including separating cream from milk, clarifying wine, and purifying proteins and cells.
Centrifugation uses centrifugal force to separate mixtures based on density. There are several types of centrifuges that differ in maximum speed and other features. Desktop centrifuges have the lowest maximum speed below 3000rpm, while ultracentrifuges can reach speeds over 75,000rpm. Centrifuges consist of a drive motor, temperature control, vacuum, and rotors. Sedimentation velocity separates mixtures in a shallow gradient over a short time, while sedimentation equilibrium separates mixtures to their equilibrium positions in a steep gradient over prolonged high-speed centrifugation.
This document discusses biological species and speciation. It defines a biological species as members of a population that can breed and produce fertile offspring. It describes reproductive isolating mechanisms that prevent interbreeding between species, including prezygotic mechanisms like behavioral, temporal, ecological, mechanical, and gametic isolation and postzygotic mechanisms like zygotic mortality, hybrid inviability, and hybrid infertility. Speciation occurs through allopatric speciation by physical separation of populations or sympatric speciation within a single population through disruptive selection on extreme traits.
Centrifugation is a process that uses centrifugal force to separate mixtures based on density. It works by spinning a liquid sample at high speeds, causing denser components to migrate outward and separate from less dense components. There are several types of centrifugation including density gradient centrifugation, differential centrifugation, and ultracentrifugation. Centrifugation has many applications such as separating immiscible liquids, purifying cells, and separating blood components.
The document provides an overview of light microscopes, including their history and key components. It discusses how the first microscopes were developed in the 1600s using simple lenses. Modern light microscopes use lenses to magnify specimens up to 1000x their actual size and include features like brightfield, darkfield, phase contrast and fluorescence microscopy. Brightfield microscopes produce a dark image on a bright background while darkfield shows bright specimens on a dark background. Microscopy has many applications in diagnostic microbiology like rapid identification of pathogens and determination of clinical significance.
This document discusses different types of locomotion in protozoa, including amoeboid locomotion, flagellar locomotion, and ciliary locomotion. It provides details on the structure and movement of pseudopodia, flagella, and cilia. Several theories are described for the mechanism of amoeboid movement, including the sol-gel theory, molecular folding and unfolding theory, and fountain zone contraction theory. The key differences between flagella and cilia are also outlined.
Diffusion and osmosis are important transport processes in living cells. Diffusion is the movement of molecules from an area of high concentration to low concentration. Osmosis is the diffusion of water across a selectively permeable membrane from an area of higher water concentration to lower. When a red blood cell is placed in distilled water, osmosis causes water to enter the cell, making it swell and burst due to the higher water concentration outside. These processes allow cells to exchange gases, take in nutrients and water, and eliminate waste, which is essential for maintaining homeostasis.
This document discusses microtomy, which is the process of sectioning tissue samples for microscopic examination. It describes different types of microtomes used to cut thin, uniform slices of tissue, including rocking, rotary, sledge, sliding, and freezing microtomes. The mechanisms and uses of each microtome type are explained. Additionally, details are provided about microtome knives, angles, sharpening techniques, and types of abrasives used to maintain a sharp cutting edge for sectioning tissues.
This document discusses four main types of electron microscopes: transmission electron microscope (TEM), scanning electron microscope (SEM), reflection electron microscope (REM), and low-voltage electron microscope (LVEM). It provides details on the components, imaging mechanisms, advantages, limitations, and typical voltages used for each microscope type. The TEM is noted as the original and most powerful microscope for high resolution imaging, but requires thin sample preparation. The SEM can image thicker bulk samples but provides 3D surface images rather than internal structure. The REM uses elastically scattered electrons for raster scanning. The LVEM provides high contrast images at lower voltages than TEMs, with improved thickness limits over conventional TEM.
This document explains leaf chromatography and the pigments found in leaves. It provides instructions for performing leaf chromatography to separate and view the different pigments. During leaf chromatography, alcohol is used to extract pigments from crushed leaves on a coffee filter. Different pigment bands appear on the filter over time, including orange carotenoids, yellow xanthophylls, blue-green chlorophyll A, and greenish-yellow chlorophyll B. Chromatography separates mixtures and is used in scientific research, food processing, forensics, and quality control.
This document summarizes plant nutrition and photosynthesis. It discusses that plants are autotrophs that produce their own food through photosynthesis, using carbon dioxide, water, and sunlight to produce glucose and oxygen. The process involves light and dark reactions that take place in the chloroplasts of leaf cells. Photosynthesis is affected by factors like carbon dioxide, temperature, and light levels. The document also describes leaf structure and mineral nutrition, noting that plants require macronutrients and micronutrients to carry out their functions.
This document discusses and compares prokaryotic and eukaryotic cells. It provides information on their key structures and functions. Prokaryotic cells are single-celled organisms that lack a nucleus and include bacteria. They have a cell membrane, cell wall, cytoplasm, ribosomes, and can reproduce asexually. Eukaryotic cells are larger, have membrane-bound organelles and a true nucleus, and can reproduce both sexually and asexually. Examples of eukaryotes include plants, animals and fungi. The document provides details on specific structures like the nucleus, cell membrane, and flagella in both cell types.
Microtomy, or the preparation of tissue slides, is the foremost technique used in histological studies. This presentation is a brief overview of the technique and the steps involved.
Phase contrast microscopy by sivasangari shanmugam
Phase-contrast microscopy, first described by Dutch physicist Frits Zernike in 1934.
It can be utilized to produce high-contrast images of transparent specimens, such as living cells (usually in culture), microorganisms, thin tissue slices, fibers, latex dispersions, glass fragments, and subcellular particles (including nuclei and other organelles).
The electron microscope was invented in 1931 and allows viewing objects at much higher magnifications than a light microscope. There are two main types: transmission electron microscopes (TEM), which use a beam of electrons to view thin samples, and scanning electron microscopes (SEM), which scan a sample's surface with a focused beam. TEMs can achieve resolutions of less than 1 nanometer but require complex sample preparation while SEMs provide three-dimensional views of surfaces but have lower resolution. Both have contributed greatly to scientific fields like biology, medicine, and materials science by revealing ultrastructures invisible to light microscopes.
The cell membrane allows the cell to maintain different internal conditions than its external environment. It is semi-permeable, allowing small molecules to pass through via diffusion or channel proteins while preventing the passage of larger molecules and ions. The membrane is made up of a phospholipid bilayer with embedded and associated proteins that transport molecules, act as receptors, and facilitate processes like active transport.
The document discusses microtomy, which is the technique of cutting extremely thin tissue sections for microscopic examination. It describes the history and development of the microtome from early manual razor cutting to modern rotary microtomes. Different types of microtomes are discussed including rotary, sliding, and freezing microtomes. Key aspects of microtomy like knife types, sharpening techniques, section cutting and processing are summarized.
Chromatography is a technique used to separate mixtures by exploiting differences in how components interact with two phases - a stationary phase and a mobile phase. The mixture is dissolved in the mobile phase which carries it through a structure containing the stationary phase. Components travel at different speeds, separating as they differentially partition between the phases. Chromatography has various applications including separating amino acids, proteins, carbohydrates, and analyzing drugs, hormones, vitamins and more. There are different types of chromatography based on the mobile and stationary phases used, such as thin layer chromatography, gas chromatography, ion exchange chromatography, and high performance liquid chromatography.
during this ppt of microscopes we will be able to know
INTRODUCTION
DEFINITION
HISTORICAL BACKGROUND
VARIABLES USED IN MICROSCOPY
VARIOUS TYPES OF MICROSCOPES
COMPOUND MICROSCOPE - Structure and Function
USE OF MICROSCOPE
CARE OF MICROSCOPE
defintion
A microscope (Greek: micron = small and scopos = aim)
MICROSCOPE - An instrument for viewing objects that are too small to be seen by the naked or unaided eye
MICROSCOPY - The science of investigating small objects using such an instrument is called microscopy
Darkfield microscopy illuminates sample edges to appear as silhouettes against a dark background. It uses a modified condenser to direct light obliquely below the sample, blocking directly transmitted light. This technique is useful for viewing thin, unstained, or living samples like bacteria, allowing observation without staining. While simple, it produces high-quality images but requires a clean sample to avoid confusing background particles.
Microscopy - Magnification, Resolving power, Principles, Types and ApplicationsNethravathi Siri
Magnification, Resolving power, Principles and Applications of Simple, Compound, Stereozoom, Phase contrast, Fluorescent and Electron microscopes (TEM & SEM).
Microscopy is the technical field that uses microscopes to observe samples which are not in the resolution range of the normal-unaided eye.
The document summarizes electron microscopes. It describes that Ernst Ruska invented the first electron microscope in 1931, which uses a beam of electrons instead of light to magnify objects. It has three main parts - an electron gun that generates electrons, electromagnetic lenses that focus the electron beam, and a specimen holder. Electron microscopes can magnify objects up to two million times, allowing visualization of structures at the nanoscale. There are two main types - transmission electron microscopes (TEM), which produce highly detailed images but require thin specimens, and scanning electron microscopes (SEM) which scan surfaces and provide 3D topographic information.
This document summarizes information about primates. It begins by describing prosimians as more primitive primates that live in small groups and rely more on smell. Strepsirrhines are very social primates that live in large family units and rely more on sight. The document then describes the evolution of primates from Purgatorius and the
Centrifugation is a process that uses centrifugal force to separate mixtures of particles based on density. It works by spinning a sample rapidly, causing denser particles to migrate outward while less dense particles move inward. There are various types of centrifuges and rotors that can be used for different applications like separating blood components, purifying proteins, or clarifying wine. Common techniques include differential centrifugation to separate cell components, density gradient centrifugation to separate mixtures based on buoyant density, and ultracentrifugation for high-speed separations. Centrifugation is widely used in industries like water treatment and laboratories for analytical purposes.
The document provides an overview of light microscopes, including their history and key components. It discusses how the first microscopes were developed in the 1600s using simple lenses. Modern light microscopes use lenses to magnify specimens up to 1000x their actual size and include features like brightfield, darkfield, phase contrast and fluorescence microscopy. Brightfield microscopes produce a dark image on a bright background while darkfield shows bright specimens on a dark background. Microscopy has many applications in diagnostic microbiology like rapid identification of pathogens and determination of clinical significance.
This document discusses different types of locomotion in protozoa, including amoeboid locomotion, flagellar locomotion, and ciliary locomotion. It provides details on the structure and movement of pseudopodia, flagella, and cilia. Several theories are described for the mechanism of amoeboid movement, including the sol-gel theory, molecular folding and unfolding theory, and fountain zone contraction theory. The key differences between flagella and cilia are also outlined.
Diffusion and osmosis are important transport processes in living cells. Diffusion is the movement of molecules from an area of high concentration to low concentration. Osmosis is the diffusion of water across a selectively permeable membrane from an area of higher water concentration to lower. When a red blood cell is placed in distilled water, osmosis causes water to enter the cell, making it swell and burst due to the higher water concentration outside. These processes allow cells to exchange gases, take in nutrients and water, and eliminate waste, which is essential for maintaining homeostasis.
This document discusses microtomy, which is the process of sectioning tissue samples for microscopic examination. It describes different types of microtomes used to cut thin, uniform slices of tissue, including rocking, rotary, sledge, sliding, and freezing microtomes. The mechanisms and uses of each microtome type are explained. Additionally, details are provided about microtome knives, angles, sharpening techniques, and types of abrasives used to maintain a sharp cutting edge for sectioning tissues.
This document discusses four main types of electron microscopes: transmission electron microscope (TEM), scanning electron microscope (SEM), reflection electron microscope (REM), and low-voltage electron microscope (LVEM). It provides details on the components, imaging mechanisms, advantages, limitations, and typical voltages used for each microscope type. The TEM is noted as the original and most powerful microscope for high resolution imaging, but requires thin sample preparation. The SEM can image thicker bulk samples but provides 3D surface images rather than internal structure. The REM uses elastically scattered electrons for raster scanning. The LVEM provides high contrast images at lower voltages than TEMs, with improved thickness limits over conventional TEM.
This document explains leaf chromatography and the pigments found in leaves. It provides instructions for performing leaf chromatography to separate and view the different pigments. During leaf chromatography, alcohol is used to extract pigments from crushed leaves on a coffee filter. Different pigment bands appear on the filter over time, including orange carotenoids, yellow xanthophylls, blue-green chlorophyll A, and greenish-yellow chlorophyll B. Chromatography separates mixtures and is used in scientific research, food processing, forensics, and quality control.
This document summarizes plant nutrition and photosynthesis. It discusses that plants are autotrophs that produce their own food through photosynthesis, using carbon dioxide, water, and sunlight to produce glucose and oxygen. The process involves light and dark reactions that take place in the chloroplasts of leaf cells. Photosynthesis is affected by factors like carbon dioxide, temperature, and light levels. The document also describes leaf structure and mineral nutrition, noting that plants require macronutrients and micronutrients to carry out their functions.
This document discusses and compares prokaryotic and eukaryotic cells. It provides information on their key structures and functions. Prokaryotic cells are single-celled organisms that lack a nucleus and include bacteria. They have a cell membrane, cell wall, cytoplasm, ribosomes, and can reproduce asexually. Eukaryotic cells are larger, have membrane-bound organelles and a true nucleus, and can reproduce both sexually and asexually. Examples of eukaryotes include plants, animals and fungi. The document provides details on specific structures like the nucleus, cell membrane, and flagella in both cell types.
Microtomy, or the preparation of tissue slides, is the foremost technique used in histological studies. This presentation is a brief overview of the technique and the steps involved.
Phase contrast microscopy by sivasangari shanmugam
Phase-contrast microscopy, first described by Dutch physicist Frits Zernike in 1934.
It can be utilized to produce high-contrast images of transparent specimens, such as living cells (usually in culture), microorganisms, thin tissue slices, fibers, latex dispersions, glass fragments, and subcellular particles (including nuclei and other organelles).
The electron microscope was invented in 1931 and allows viewing objects at much higher magnifications than a light microscope. There are two main types: transmission electron microscopes (TEM), which use a beam of electrons to view thin samples, and scanning electron microscopes (SEM), which scan a sample's surface with a focused beam. TEMs can achieve resolutions of less than 1 nanometer but require complex sample preparation while SEMs provide three-dimensional views of surfaces but have lower resolution. Both have contributed greatly to scientific fields like biology, medicine, and materials science by revealing ultrastructures invisible to light microscopes.
The cell membrane allows the cell to maintain different internal conditions than its external environment. It is semi-permeable, allowing small molecules to pass through via diffusion or channel proteins while preventing the passage of larger molecules and ions. The membrane is made up of a phospholipid bilayer with embedded and associated proteins that transport molecules, act as receptors, and facilitate processes like active transport.
The document discusses microtomy, which is the technique of cutting extremely thin tissue sections for microscopic examination. It describes the history and development of the microtome from early manual razor cutting to modern rotary microtomes. Different types of microtomes are discussed including rotary, sliding, and freezing microtomes. Key aspects of microtomy like knife types, sharpening techniques, section cutting and processing are summarized.
Chromatography is a technique used to separate mixtures by exploiting differences in how components interact with two phases - a stationary phase and a mobile phase. The mixture is dissolved in the mobile phase which carries it through a structure containing the stationary phase. Components travel at different speeds, separating as they differentially partition between the phases. Chromatography has various applications including separating amino acids, proteins, carbohydrates, and analyzing drugs, hormones, vitamins and more. There are different types of chromatography based on the mobile and stationary phases used, such as thin layer chromatography, gas chromatography, ion exchange chromatography, and high performance liquid chromatography.
during this ppt of microscopes we will be able to know
INTRODUCTION
DEFINITION
HISTORICAL BACKGROUND
VARIABLES USED IN MICROSCOPY
VARIOUS TYPES OF MICROSCOPES
COMPOUND MICROSCOPE - Structure and Function
USE OF MICROSCOPE
CARE OF MICROSCOPE
defintion
A microscope (Greek: micron = small and scopos = aim)
MICROSCOPE - An instrument for viewing objects that are too small to be seen by the naked or unaided eye
MICROSCOPY - The science of investigating small objects using such an instrument is called microscopy
Darkfield microscopy illuminates sample edges to appear as silhouettes against a dark background. It uses a modified condenser to direct light obliquely below the sample, blocking directly transmitted light. This technique is useful for viewing thin, unstained, or living samples like bacteria, allowing observation without staining. While simple, it produces high-quality images but requires a clean sample to avoid confusing background particles.
Microscopy - Magnification, Resolving power, Principles, Types and ApplicationsNethravathi Siri
Magnification, Resolving power, Principles and Applications of Simple, Compound, Stereozoom, Phase contrast, Fluorescent and Electron microscopes (TEM & SEM).
Microscopy is the technical field that uses microscopes to observe samples which are not in the resolution range of the normal-unaided eye.
The document summarizes electron microscopes. It describes that Ernst Ruska invented the first electron microscope in 1931, which uses a beam of electrons instead of light to magnify objects. It has three main parts - an electron gun that generates electrons, electromagnetic lenses that focus the electron beam, and a specimen holder. Electron microscopes can magnify objects up to two million times, allowing visualization of structures at the nanoscale. There are two main types - transmission electron microscopes (TEM), which produce highly detailed images but require thin specimens, and scanning electron microscopes (SEM) which scan surfaces and provide 3D topographic information.
This document summarizes information about primates. It begins by describing prosimians as more primitive primates that live in small groups and rely more on smell. Strepsirrhines are very social primates that live in large family units and rely more on sight. The document then describes the evolution of primates from Purgatorius and the
Centrifugation is a process that uses centrifugal force to separate mixtures of particles based on density. It works by spinning a sample rapidly, causing denser particles to migrate outward while less dense particles move inward. There are various types of centrifuges and rotors that can be used for different applications like separating blood components, purifying proteins, or clarifying wine. Common techniques include differential centrifugation to separate cell components, density gradient centrifugation to separate mixtures based on buoyant density, and ultracentrifugation for high-speed separations. Centrifugation is widely used in industries like water treatment and laboratories for analytical purposes.
This document provides information on centrifugation techniques. It discusses:
- Centrifugation uses centrifugal force to separate heterogeneous mixtures using a centrifuge. It can be used for rapid separation of solids from liquids or separation of immiscible liquids.
- There are different types of centrifuges including perforated basket centrifuges (batch, semi-continuous, continuous) and non-perforated basket centrifuges.
- Centrifugation has various applications including production of bulk drugs, biological products, evaluation of suspensions and emulsions, and molecular weight determination. It is a useful separation technique when ordinary filtration is difficult.
i am HAFIZ M WASEEM from mailsi vehari
bsc in science college multan pakistan
msc univesity of education lahore pakistan
i love pakistan and my teachers
The document discusses centrifugation, which uses centrifugal force to separate mixtures based on density. It separates fluids and particles by spinning them at high speeds in a centrifuge. Centrifugation is commonly used in biology to isolate cellular components like organelles, DNA, RNA, and proteins. It separates mixtures into a pellet of dense particles and a supernatant of less dense fluid. Centrifugation has many applications and works by accelerating denser substances outward using sedimentation. Safety is important when operating centrifuges.
Centrifugation is a technique used to separate particles in a solution based on their density. It works by applying centrifugal force using a centrifuge. There are different types of centrifuges that separate particles at varying speeds, including low-speed centrifuges up to ultracentrifuges that can spin at over 65,000 RPM. The principle involves particles of higher density sinking to the bottom while lower density particles float to the top. Centrifugation is used in clinical and research applications to separate blood components, subcellular organelles, proteins, and more.
Centrifugation is a technique that uses centrifugal force to separate mixtures based on density. It works by spinning samples at high speeds, which causes heavier components to sediment. There are several types including preparative centrifugation to separate/purify biological samples, analytical centrifugation to determine physical characteristics, differential centrifugation to separate cell components, density gradient centrifugation to separate mixtures based on density differences, and ultracentrifugation using very high speeds. Centrifugation has many applications in research, medicine, and industry.
Separation techniques are those techniques that can be used to separate two different states of matter such as liquids and solids.
Separation is an important asset to purify component of interest from a mixture.
Separation techniques are used to separate mixtures into individual components. Some common separation techniques include distillation, crystallization, chromatography, filtration, centrifugation, and magnetic separation. Distillation uses boiling point differences to separate liquid mixtures through heating and condensation. Crystallization separates dissolved solids from liquids by controlling temperature during solvent evaporation. Chromatography separates mixtures based on how components interact with stationary and mobile phases.
This document summarizes a presentation on centrifugation given by Bhavika B. Katariya. It defines centrifugation as a process that uses centrifugal force to separate materials of different densities in a suspension. The key principles of centrifugation are explained, including how centrifuges use very strong centrifugal forces compared to gravity alone to separate particles based on density differences. The main types of centrifugation are described as density gradient, differential, and ultra centrifugation. Applications of centrifugation in various fields like biology, chemistry and forensics are also listed.
Centrifugation is a technique used to separate substances of different densities using centrifugal force. There are several types of centrifuges that differ in maximum speed, including low-speed centrifuges up to 5000 rpm, high-speed centrifuges up to 20,000 rpm, and ultracentrifuges up to 65,000 rpm. Common types of centrifugation include differential centrifugation, density gradient centrifugation, and rate-zonal density gradient centrifugation, which separate particles based on sedimentation rate and density. Centrifugation has many applications, such as separating blood components, purifying proteins and other macromolecules, and separating particles from fluids.
This document summarizes differential and density gradient centrifugation. It defines centrifugation as a process used to separate materials suspended in a liquid medium using centrifugal force. It then discusses the principle behind centrifugation, where denser components migrate away from the axis. It describes the instrumentation, including low-speed centrifuges used for routine sedimentation, high-speed centrifuges for more sophisticated applications, and ultracentrifuges generating intense heat. It also outlines types of centrifugation techniques like density gradient and differential centrifugation and their uses. Applications include separating blood components, precipitated proteins, and subcellular organelles.
Solid liquid separation - unit operationsVickyVicrun
This document discusses various techniques for solid-liquid separation used in downstream processing. It begins by defining downstream processing as the recovery and purification of products from fermentation or other industrial processes. Some key techniques discussed include centrifugation, filtration, evaporation, flocculation, and flotation. Centrifugation uses centrifugal force to separate particles based on size, shape and density. Filtration separates solids from liquids by passing the liquid through a porous filter. Flocculation involves aggregating cells or debris to settle more easily. Overall, the document provides an overview of several important solid-liquid separation methods employed in downstream bioprocessing.
Isolation of organelles is accomplished by cell membrane lysis and density gradient centrifugation to separate organelles from contaminating cellular structures. Intact nuclei and organelles have distinctive sizes in mammalian cells, enabling them to be separated by this method.
This document provides information about centrifugation including its definition, principle, applications, types, and instruments. It can be summarized as follows:
Centrifugation uses centrifugal force to separate particles in a solution based on properties like size, density, and viscosity. It works by spinning the solution at high speeds, which forces denser particles to settle out. Common applications include separating drugs, proteins, and analyzing suspensions and emulsions in pharmaceutical and biomedical fields. There are two main types - sedimentation centrifuges separate based on density differences, while filtration centrifuges use a membrane to retain solids. Common instruments described include perforated basket, non-perforated basket, semi-continuous, and super centrifuges.
Differential centrifugation is a technique used to separate cellular components based on differences in size, shape, and density. It involves subjecting a sample to a series of centrifugation steps with increasing centrifugal force. In each step, particles sediment at different rates, allowing separation into distinct fractions. Larger, denser particles pellet in earlier steps, while smaller, less dense particles require higher forces. This sequential separation results in distinct pellets containing isolated organelles, structures, and other cellular particles according to their physical properties. Differential centrifugation is a fundamental technique in cell biology and biochemistry.
Pharmaceutical Engineering Unit -4.pptxNikita Gupta
This document provides information about various filtration and centrifugation techniques used in pharmaceutical engineering. It discusses the principles, applications, and mechanisms of filtration including plate and frame filters, filter leaves, rotary drum filters, meta filters, cartridge filters, and membrane filters. It also covers the principles, objectives, and applications of centrifugation. Specific devices discussed include perforated basket centrifuges, non-perforated basket centrifuges, semi-continuous centrifuges, and super centrifuges. Theories related to filtration rate and factors influencing filtration are also summarized.
This document discusses various membrane separation techniques used in food processing, including reverse osmosis, ultrafiltration, and microfiltration. It explains the basic operation of these techniques, comparing how they separate molecules of different sizes. It also covers membrane materials and module designs, factors that influence separation efficiency like concentration polarization, and techniques for membrane cleaning. Finally, it discusses freeze concentration as another method for separating ice crystals from concentrated liquid food.
Centrifugation is a technique used for the separation of particles from a solution according to their size, shape, density, viscosity of the medium and rotor speed. The particles are suspended in a liquid medium and placed in a centrifuge tube. The tube is then placed in a rotor and spun at a define speed.
Similar to Extraction techniques(cell fraction filtration distellation soxhlet extraction centrifugation ultracentrifgation ) (20)
Production of live food (Aquatic micro animals)for the rearing of fish fry at...Hafiz M Waseem
Production of live food (Aquatic micro animals)for the rearing of fish fry at hatcheries ROTIFERSBrachionus sp. CRUSTACEANS (CLADOCERANS)Moina sp. Daphnia sp.
green water production at fish hatcheries and its uses to enhance primary pro...Hafiz M Waseem
green water production at fish hatcheries and its uses to enhance primary productivity.ppt
Chlorella sp.
Scenedesmus sp.
Tetraselmis chuii
Skeletonemia sp
Spirulina sp.
Chaetoceros sp.
Nitzschia sp.
The biofloc is a protein-rich aggregate of organic material and microorganisms that forms in aquaculture systems. Biofloc technology maintains water quality and provides nutrients by balancing carbon and nitrogen through the addition of carbon sources like molasses. It has been successfully used in tilapia and shrimp farming and allows for high stocking densities through natural water treatment. Key factors that must be controlled include carbon to nitrogen ratio, dissolved oxygen, pH, and ammonia, nitrite and nitrate levels.
Determination of p h of waste water sample .....................................Hafiz M Waseem
ecologyDetermination of pH of Waste Water Sample ..................................................... 4
Determination Dissolved Oxygen within Water ................................................... 5
Adaptive Features of Animals in Relation to Food and Environment .................. 7
Study the Plant Population Density ................................................................... 10
Experimental Design and Approaches to Ecological Research ........................ 12
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
I AM HAFIZ MUHAMMAD WASEEM from mailsi vehari
BSc from science college Multan
MSC university of education Lahore
i love Pakistan and my teachers and my parents
I AM HAFIZ MUHAMMAD WASEEM from mailsi vehari
BSc from science college Multan
MSC university of education Lahore
i love Pakistan and my teachers and my parents
I AM HAFIZ MUHAMMAD WASEEM from mailsi vehari
BSc from science college Multan
MSC university of education Lahore
i love Pakistan and my teachers and my parents
Trophic levels and energy variation with increasing trophic levels.food chain...Hafiz M Waseem
I AM HAFIZ MUHAMMAD WASEEM from mailsi vehari
BSc from science college Multan
MSC university of education Lahore
i love Pakistan and my teachers and my parents
I AM HAFIZ MUHAMMAD WASEEM from mailsi vehari
BSc from science college Multan
MSC university of education Lahore
i love Pakistan and my teachers and my parents
I AM HAFIZ MUHAMMAD WASEEM from mailsi vehari
BSc from science college Multan
MSC university of education Lahore
i love Pakistan and my teachers and my parents
I AM HAFIZ MUHAMMAD WASEEM from mailsi vehari
BSc from science college Multan
MSC university of education Lahore
i love Pakistan and my teachers and my parents
I AM HAFIZ MUHAMMAD WASEEM from mailsi vehari
BSc from science college Multan
MSC university of education Lahore
i love Pakistan and my teachers and my parents
I AM HAFIZ MUHAMMAD WASEEM from mailsi vehari
BSc from science college Multan
MSC university of education Lahore
i love Pakistan and my teachers and my parents
This document contains personal information for Hafiz Muhammad Waseem of Lahore, Pakistan who is taking the course Applied Ecology (ZOOL3118) at the University of Education Lahore, Pakistan. It also lists Books for reference.
I AM HAFIZ MUHAMMAD WASEEM from mailsi vehari
BSc from science college Multan
MSC university of education Lahore
i love Pakistan and my teachers and my parents
Reimagining Your Library Space: How to Increase the Vibes in Your Library No ...Diana Rendina
Librarians are leading the way in creating future-ready citizens – now we need to update our spaces to match. In this session, attendees will get inspiration for transforming their library spaces. You’ll learn how to survey students and patrons, create a focus group, and use design thinking to brainstorm ideas for your space. We’ll discuss budget friendly ways to change your space as well as how to find funding. No matter where you’re at, you’ll find ideas for reimagining your space in this session.
Chapter wise All Notes of First year Basic Civil Engineering.pptxDenish Jangid
Chapter wise All Notes of First year Basic Civil Engineering
Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
Levelling: Instrument used Object of levelling, Methods of levelling in brief, and Contour maps.
Chapter 4
Buildings: Selection of site for Buildings, Layout of Building Plan, Types of buildings, Plinth area, carpet area, floor space index, Introduction to building byelaws, concept of sun light & ventilation. Components of Buildings & their functions, Basic concept of R.C.C., Introduction to types of foundation
Chapter 5
Transportation: Introduction to Transportation Engineering; Traffic and Road Safety: Types and Characteristics of Various Modes of Transportation; Various Road Traffic Signs, Causes of Accidents and Road Safety Measures.
Chapter 6
Environmental Engineering: Environmental Pollution, Environmental Acts and Regulations, Functional Concepts of Ecology, Basics of Species, Biodiversity, Ecosystem, Hydrological Cycle; Chemical Cycles: Carbon, Nitrogen & Phosphorus; Energy Flow in Ecosystems.
Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
Text Books:
1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
This document provides an overview of wound healing, its functions, stages, mechanisms, factors affecting it, and complications.
A wound is a break in the integrity of the skin or tissues, which may be associated with disruption of the structure and function.
Healing is the body’s response to injury in an attempt to restore normal structure and functions.
Healing can occur in two ways: Regeneration and Repair
There are 4 phases of wound healing: hemostasis, inflammation, proliferation, and remodeling. This document also describes the mechanism of wound healing. Factors that affect healing include infection, uncontrolled diabetes, poor nutrition, age, anemia, the presence of foreign bodies, etc.
Complications of wound healing like infection, hyperpigmentation of scar, contractures, and keloid formation.
Leveraging Generative AI to Drive Nonprofit InnovationTechSoup
In this webinar, participants learned how to utilize Generative AI to streamline operations and elevate member engagement. Amazon Web Service experts provided a customer specific use cases and dived into low/no-code tools that are quick and easy to deploy through Amazon Web Service (AWS.)
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...PECB
Denis is a dynamic and results-driven Chief Information Officer (CIO) with a distinguished career spanning information systems analysis and technical project management. With a proven track record of spearheading the design and delivery of cutting-edge Information Management solutions, he has consistently elevated business operations, streamlined reporting functions, and maximized process efficiency.
Certified as an ISO/IEC 27001: Information Security Management Systems (ISMS) Lead Implementer, Data Protection Officer, and Cyber Risks Analyst, Denis brings a heightened focus on data security, privacy, and cyber resilience to every endeavor.
His expertise extends across a diverse spectrum of reporting, database, and web development applications, underpinned by an exceptional grasp of data storage and virtualization technologies. His proficiency in application testing, database administration, and data cleansing ensures seamless execution of complex projects.
What sets Denis apart is his comprehensive understanding of Business and Systems Analysis technologies, honed through involvement in all phases of the Software Development Lifecycle (SDLC). From meticulous requirements gathering to precise analysis, innovative design, rigorous development, thorough testing, and successful implementation, he has consistently delivered exceptional results.
Throughout his career, he has taken on multifaceted roles, from leading technical project management teams to owning solutions that drive operational excellence. His conscientious and proactive approach is unwavering, whether he is working independently or collaboratively within a team. His ability to connect with colleagues on a personal level underscores his commitment to fostering a harmonious and productive workplace environment.
Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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Find out more about ISO training and certification services
Training: ISO/IEC 27001 Information Security Management System - EN | PECB
ISO/IEC 42001 Artificial Intelligence Management System - EN | PECB
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A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
This presentation was provided by Steph Pollock of The American Psychological Association’s Journals Program, and Damita Snow, of The American Society of Civil Engineers (ASCE), for the initial session of NISO's 2024 Training Series "DEIA in the Scholarly Landscape." Session One: 'Setting Expectations: a DEIA Primer,' was held June 6, 2024.
3. CENTRIFUGATION
• Separates different particles from a
solution
• Separates according to their size, shape,
density, viscosity of the medium and rotor
speed.
4. • The particles are suspended in a liquid medium
and placed in a centrifuge tube.
• The tube is then placed in a rotor and spun at a
define speed.
• Rotation of the rotor about a central axis
generates a centrifugal force upon the particles
in the suspension.
7. CENTRIFUGE MACHINE
• It is a device that separates
particles from a solution
through use of a rotor.
• these particles are usually
cells, subcellular organelles, or
large molecules.
8. TYPES OF
CENTRIFUGATION
• Microcentrifuges
• SMALL BENCHTOP CENTRIFUGES
• GENERAL PURPOSE CENTRIFUGES
• LARGE CAPACITY CENTRIFUGES
• SUPERSPEED CENTRIFUGES
• ULTRACENTRIFUGES
• DENSITY GRADIENT CENTRIFUGATION
• DIFFERENTIAL CENTRIFUGATION
9. Microcentrifuges
• used to process small
volumes of biological
molecules, cells,
or nuclei.
• generally hold 0.5 - 2.0
mL of liquid
10. Continued….
• spun at maximum angular speeds of 12,000–
13,000 rpm.
• small enough to fit on a table-top and
• have rotors that can quickly change speeds.
• They may or may not have
a refrigeration function.
11. SMALL BENCHTOP
CENTRIFUGES
• used for small amount of
material that rapidly sediment
like yeast cells, erythrocytes
etc.,
• they offer maximized capacity
in a compact footprint.
14. GENERAL PURPOSE
CENTRIFUGES
• These centrifuges feature innovative
rotor technologies designed for
improved benchtop performance
and flexibility, greater sample
capacity, and increased speed.
• There is lots of choice of rotors,
buckets and adaptators to fit your
needs.
15. LARGE CAPACITY CENTRIFUGES
• our large capacity centrifuges provide
reproducible separations for
high‐throughput applications such as
blood banking and bioprocessing.
16. SUPERSPEED CENTRIFUGES
• Combine cutting-edge technology,
• high-speed performance, and
• versatile rotor capacities, allow to
maximiz productivity
with impressive acceleration rates.
• .
18. DENSITY GRADIENT
CENTRIFUGATION
• one of the more efficient methods of separating
suspended particles.
• Density gradient centrifugation can be used both
as a separation technique and as a method of
measuring the densities of particles or molecules
in a mixture.
19. DIFFERENTIAL
CENTRIFUGATION
• selectively spins down components of a mixture by a
series of increasing centrifugation forces.
• This method is commonly used to separate organelles
and membranes found in cells.
• Organelles generally differ from each other in density in
size, making the use of differential centrifugation.
• The organelles can then be identified by testing for
indicators that are unique to the specific organelles.
20. APPLICATION
• Separating chalk powder from water
• Removing fat from milk to produce skimmed milk
• Separating particles from an air-flow using cyclonic separation
• The clarification and stabilization of wine
• Separation of urine components and blood components in
forensic and research laboratories
• Aids in separation of proteins using purification techniques
such as salting out, e.g. ammonium sulfate precipitation
22. CELL FRACTIONATION
• It allows different parts of a cell to be separated
from each other using centrifugation.
• The purpose is to
isolate/fractionate cell components based on
size and density.
23. • Once the cells have been fractionated,
organelles such as the plasma membrane,
nucleus, and mitochondria can be studied
separately.
• Cell fractionation allows to study the different
parts of a cell in isolation.
• Let's look further into the steps involved in this
process.
24. STEPS INVOLVED IN CELL
FRACTIONATION
• Step One: Breaking the cells or cell lysis
• Step Two: Separation
• Step Three: Collection
25. STEP ONE: BREAKING THE CELLS
OR CELL LYSIS
• Detergents disrupt cell membrane to be opened so
that the contents inside the cell can be obtained.
• Detergents do so because they can interact with
both membranes and parts of the cell that are
soluble in water.
26. • Since detergents can interact with both lipid
(membrane) and soluble (cytoplasmic) parts of
the cell, they allow cellular components to be
mixed or homogenized.
• When the cellular components are mixed, a cell
homogenate, or cell lysate, is formed.
27. • Lysing, or opening the cells, in detergent is usually
combined with a physical method that breaks the cell
further, such as machines that are similar to blenders,
glass beads, or breaking the cell using sound energy.
• Using physical methods in combination with detergents
ensures that all of the cells in the sample get broken, and
you can isolate as much of your cellular fraction as
possible
28.
29. STEP TWO: SEPARATION
• Cell homogenates are separated into fractions by
centrifugation.
• centrifugation produces forces that are thousands of times
higher than gravity, and cellular components are pushed
toward the bottom of the container they are in.
30. Continued….
• The smaller components stay homogenized in the liquid
(labeled supernatant in the image) and the larger
components will move to the bottom.
• Repeating the centrifugation with increasing force allows
smaller cellular components to be separated as seen in
this figure.
31.
32. STEP THREE: COLLECTION
• The way cell fractions are collected will depend on the liquid in
which the cell fractions are centrifuged.
• Cell fractions are usually centrifuged in a medium, or liquid, that
provides osmotic support such as sucrose or Percoll.
• The liquids aid in the separation of cellular components based on
density and size.
• If only one concentration of sucrose or Percoll is used, it is
called differential centrifugation because the different fractions will
be collected by centrifuging the sample several times, as shown in
this figure.
33.
34. FILTRATION
• Filtration is a physical,
biological or chemical
operation that
separates solid matter
and fluid from a
mixture.
35. CONTINUED….
• It requires a filter medium through which only
fluid can pass.
• Solid particles that cannot pass through the filter
medium are described as oversize and
• the fluid that passes through is called the filtrate
36. Hot filtration
• used to separate solids from a hot solution.
• This is done in order to prevent crystal formation in the
filter funnel and other apparatuses
• Therefor apparatus and the solution used are heated
• One of the most important measures to prevent the
formation of crystals is use of stemless filter funnel.
37. COLD FILTRATION
• This method is used when the solid is initially dissolved.
• The solution is cooled down before filtration.
• Cold Filtration method is the use of ice bath in order to
rapidly cool down the solution to be crystallized rather
than leaving it out to cool it down slowly in the room
temperature.
• This technique results to the formation of very small
crystals.
38. DISTILLATION
• A process in which a liquid or
vapour mixture of two or more
substances is separated into
its component fractions of
desired purity, by the
application and removal of
heat.
39. CONTINUED….
• Distillation is based on the fact that the vapour of a
boiling mixture will be richer in the components that
have lower boiling points.
• Therefore, when this vapour is cooled and condensed,
the condensate will contain more volatile components.
40. • At the same time, the original mixture will contain more
of the less volatile material.
• Distillation columns are designed to achieve this
separation efficiently.
41. SOXHLET EXTRACTOR
• invented in 1879 by Franz von Soxhlet.
• designed for the extraction of a lipid from a solid
material.
• Typically, Soxhlet extraction is used when the
desired compound has a limited solubility in a
solvent, and
• the impurity is insoluble in that solvent.
To get to the content inside of something, you have to open it. Cells are no different.
Detergents allow the cell membrane to be opened so that the contents inside the cell can be obtained.