Neutron Activation Analysis is a technique used to determine the concentrations of elements in a sample. It involves irradiating a dried and powdered plant sample in a nuclear reactor to induce radioactivity in the elements. The radioactivity is then measured using a detector and specialized software analyzes the radiation peaks to identify and quantify the amounts of elements like arsenic in the sample.
Neutron Activation analysis is a nuclear process used for determining the concentrations of elements in a vast amount of materials. It is useful for precise identification and quantification
of the elements. There are two types of NAA.
It has a wide ranges of applications in chemistry , geology, archaeology, medicine, environmental monitoring and even in the forensic science.
A brief intoducation on Radiopharmaceutical including types of radiation, isotopes, manufacturing, Quality control , and equipments for measurement of radioactivity and Application of radiopharmaceuticals.
Neutron Activation analysis is a nuclear process used for determining the concentrations of elements in a vast amount of materials. It is useful for precise identification and quantification
of the elements. There are two types of NAA.
It has a wide ranges of applications in chemistry , geology, archaeology, medicine, environmental monitoring and even in the forensic science.
A brief intoducation on Radiopharmaceutical including types of radiation, isotopes, manufacturing, Quality control , and equipments for measurement of radioactivity and Application of radiopharmaceuticals.
DNA microarray technique enables one to analyze the expression of many genes in a single reaction quickly and in an efficient manner. This technique has been elaborately described in this presentation
Biofabrication of Silver Nanoparticles Using the Aqueous Extract of Weaver An...BRNSS Publication Hub
Environment has created creative and well-designed ways for developing nanomaterials having intriguing properties. Nanotechnology is having hope to open new avenues to combat and avert diseases using atomic-level fabrication of materials. Herein, we demonstrate the fabrication of silver nanoparticles using aqueous extract of weaver ant’s (Oecophylla smaragdina) nest and its characterization using valuable techniques such as ultraviolet-visible spectroscopy, X-ray diffraction analysis, scanning electron microscopy analysis, Fourier-transform infrared spectroscopy, and atomic force microscopy analysis. Cytotoxicity of newly synthesized silver nanoparticles was analyzed using the Vero cells. By analyzing the results critically, it is hypothesized that synthesis and stabilization of silver nanoparticles were achieved using the molecules present in the aqueous extract of O. smaragdina nest.
This presentation in mainly focused of understanding of automation and its utility in cytopathology. It will be very usefull for postgraduate in pathology, cytopathologist and cytotechnicians.
Nanotechnology is a field that deals with things at molecular level that is as tiny as 10^(-9) of units and finds very useful implementations from cleaning clothes to curing the "incurable"--CANCER.
DNA microarray technique enables one to analyze the expression of many genes in a single reaction quickly and in an efficient manner. This technique has been elaborately described in this presentation
Biofabrication of Silver Nanoparticles Using the Aqueous Extract of Weaver An...BRNSS Publication Hub
Environment has created creative and well-designed ways for developing nanomaterials having intriguing properties. Nanotechnology is having hope to open new avenues to combat and avert diseases using atomic-level fabrication of materials. Herein, we demonstrate the fabrication of silver nanoparticles using aqueous extract of weaver ant’s (Oecophylla smaragdina) nest and its characterization using valuable techniques such as ultraviolet-visible spectroscopy, X-ray diffraction analysis, scanning electron microscopy analysis, Fourier-transform infrared spectroscopy, and atomic force microscopy analysis. Cytotoxicity of newly synthesized silver nanoparticles was analyzed using the Vero cells. By analyzing the results critically, it is hypothesized that synthesis and stabilization of silver nanoparticles were achieved using the molecules present in the aqueous extract of O. smaragdina nest.
This presentation in mainly focused of understanding of automation and its utility in cytopathology. It will be very usefull for postgraduate in pathology, cytopathologist and cytotechnicians.
Nanotechnology is a field that deals with things at molecular level that is as tiny as 10^(-9) of units and finds very useful implementations from cleaning clothes to curing the "incurable"--CANCER.
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The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
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Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
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This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
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The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
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This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
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Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
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http://sandymillin.wordpress.com/iateflwebinar2024
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Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
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For more information, visit-www.vavaclasses.com
The French Revolution Class 9 Study Material pdf free download
neutron activation analysis re chemistry
1. Neutron Activation Analysis
Neutron Activation Analysis (NAA) – one of a
number of techniques used to accurately
determine the concentrations of elements in a
sample.
This process requires the use of a nuclear
reactor to irradiate the sample.
We will illustrate this process with a plant
sample to determine the amount of a particular
metal its tissues contain (example: arsenic).
2. 1. Obtain plant sample.
Wash the sample to remove possible contaminants.
3. 2. Dehydrate the sample.
Dehydration methods
use heat or freeze-
drying.
A lyophilizer is
frequently used for
the freeze-dry
method.
A plant sample is then
placed in the chamber
atop the lyophilizer to
the right.
4. 3. The dehydrated sample is then prepared for testing.
A small amount of dehydrated plant material is
removed from this bag.
5. 4. A portion of the dried plant material is ground into a
powder using a mortar and pestle.
Sterile technique is required to avoid cross
contamination.
6. 5. Bag the sample.
Some of the ground plant powder is bagged into a small
plastic envelope. The sample is double-bagged and
labeled.
7. 6. Select a standard for comparison.
When looking for arsenic in
plant material, you would
need to prepare a sample of
a standard containing
arsenic.
The “standard” contains a
known quantity of the
element you are looking for.
Containers of certified
standards are pictured.
8. 7. Place packages of both the prepared sample
and standard sample in a capsule.
9. 8. Take sample to the rabbit system apparatus.
The rabbit system works much
like the system used by banks
at drive-through windows. A
canister carries items back and
forth between the customer
and teller.
The sample is sent through the
wall in a mini canister into the
nuclear reactor located behind
the wall.
Once inside the reactor, the
sample is irradiated with
neutrons.
10. 8 (a). This is a close-up view of a capsule being
placed into the rabbit system.
Sterile technique is required.
11. 9. After irradiation of the sample in the capsule, and before
removing it from the reactor site, it must be determined if the
capsule is safe for transfer. A Geiger counter is used to assess
whether the radioactive decay has reached low enough levels to
be safe.
12. 10. The prepared sample and standard sample
are placed in a “detector” one at a time.
The detector system
counts and records
gamma radiation
emissions for a period
of time.
Time varies, but is
usually in the range of
5 minutes to an hour.
14. 12. Specialized software analyzes radiation peaks.
Peak data is correlated to specific elements for
identification and quantification.
15. 13. Computer data is compared to a nuclide chart
to evaluate the results.
16. Uses of Neutron Activation Analysis
NAA can be used to determine
the presence of a variety of
elements in a sample.
Examples include:
Mercury levels in tuna fish
Aluminum levels in finger nails
Gold levels in hair
Zinc levels in soil
Arsenic levels in plants
(Photos courtesy of the Laboratory
Facility at the University of Florida
Training Reactor)