This document discusses bioaerosols, which are airborne biological contaminants like viruses, bacteria, and fungi. It notes that while their outdoor presence is natural, indoor control is possible. It outlines several health effects of bioaerosols, which can cause infections when inhaled or deposited on wounds. The document then focuses on fungi, molds, and the various health impacts molds can have like allergies, infections, and toxicity. It also discusses sources of bioaerosols like humans, pets and moist indoor surfaces. Sampling techniques and control strategies are presented.
Bioaerosols are small, airborne biological materials & are subcategories of particles released from terrestrial and marine ecosystems into the atmosphere. They are ubiquitous in the environment comprised of aerosols that originated biologically such as live or dead microorganism and their metabolites, toxins, or fragments that exist widely in the environment.
Air Microbiology. Aerobiology is defined as the study of life present in the air. Aeromicrobiology relates to the study of environmentally relevant microorganisms. ... In dry whether the microbial load of air is high while in wet weather the rain washes the microorganisms from the air.
Air is not a natural environment for microorganisms. Microorganisms present in air are liberated from various other sources. These various sources include soil, water, plant and animal surfaces and human beings.
Bioaerosols are small, airborne biological materials & are subcategories of particles released from terrestrial and marine ecosystems into the atmosphere. They are ubiquitous in the environment comprised of aerosols that originated biologically such as live or dead microorganism and their metabolites, toxins, or fragments that exist widely in the environment.
Air Microbiology. Aerobiology is defined as the study of life present in the air. Aeromicrobiology relates to the study of environmentally relevant microorganisms. ... In dry whether the microbial load of air is high while in wet weather the rain washes the microorganisms from the air.
Air is not a natural environment for microorganisms. Microorganisms present in air are liberated from various other sources. These various sources include soil, water, plant and animal surfaces and human beings.
Air microbiology study of microbes suspended in air. Microflora of air depend on the location and environmental condition at particular place. There are different types of air trapping devices like Slit Sampler, Andersons samplers, Impingers etc. Air borne diseases mainly spread by droplet infection, contact with infected things . Air borne diseases are discussed and concluded with control of air borne microbes.
Air sanitation is the system of removing the impurities present in air inside buildings to protect people from infections. Sanitation of air is essential in enclosed places like hospitals and operation rooms.
Air microbiology is a scientific discipline that concerns the microorganisms, including bacteria, archaea, fungi and viruses, in the atmospheric air. It is a subdiscipline of environmental microbiology.
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Introduction
History
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Airborne Diseases
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Hydrocarbon are major constituents of crude oil and petroleum. They can be biodegraded by naturally-occurring microorganisms in freshwater and marine environments under a variety of aerobic and anaerobic conditions. The ability of microorganisms - bacteria, archaea, fungi, or algae - to break down hydrocarbons is the basis for natural and enhanced bioremediation. To promote biodegradation, amendments such as nitrogen and phosphorous fertilizer are often added to stimulate microbial growth and metabolism
Air pollution is contamination of the indoor or outdoor environment by any chemical, physical or biological agent that modifies the natural characteristics of the atmosphere.
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This presentation covers the basics of Indoor Air Quality -- and much more. From actinomycetes to VOCs, we hope you find this primer on IAQ to be useful and informative. (c) 2002-2011 Michaels Engineering Inc.
Air microbiology study of microbes suspended in air. Microflora of air depend on the location and environmental condition at particular place. There are different types of air trapping devices like Slit Sampler, Andersons samplers, Impingers etc. Air borne diseases mainly spread by droplet infection, contact with infected things . Air borne diseases are discussed and concluded with control of air borne microbes.
Air sanitation is the system of removing the impurities present in air inside buildings to protect people from infections. Sanitation of air is essential in enclosed places like hospitals and operation rooms.
Air microbiology is a scientific discipline that concerns the microorganisms, including bacteria, archaea, fungi and viruses, in the atmospheric air. It is a subdiscipline of environmental microbiology.
Environmental Microbiology: Microbial degradation of recalcitrant compoundsTejaswini Petkar
A brief presentation on 'Microbial degradation of recalcitrant compounds'- their classes,their sources, the microorganisms involved and their modes of degradation,
Introduction
History
Definition
Aerobiological pathway
Fundamentals of Aerobiology
New techniques for advancing aerosol science and aerobiology
Airborne Diseases
Conclusion
Hydrocarbon are major constituents of crude oil and petroleum. They can be biodegraded by naturally-occurring microorganisms in freshwater and marine environments under a variety of aerobic and anaerobic conditions. The ability of microorganisms - bacteria, archaea, fungi, or algae - to break down hydrocarbons is the basis for natural and enhanced bioremediation. To promote biodegradation, amendments such as nitrogen and phosphorous fertilizer are often added to stimulate microbial growth and metabolism
Air pollution is contamination of the indoor or outdoor environment by any chemical, physical or biological agent that modifies the natural characteristics of the atmosphere.
Indoor Air Quality -- The Basics And MoreMartyRayToo
This presentation covers the basics of Indoor Air Quality -- and much more. From actinomycetes to VOCs, we hope you find this primer on IAQ to be useful and informative. (c) 2002-2011 Michaels Engineering Inc.
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A presentation to help Floridians understand, improve, and maintain their indoor air quality and the indoor environmental challenges in Florida. by John Lapotaire, CIEC. Microshield Environmental Services, LLC.
John P. Lapotaire, CIEC
Microshield Environmental Services, LLC
www.FloridaIAQ.com
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Indoor Air Quality in Florida's Homes, John Lapotaire, CIEC, Microshield IAQJohn P. Lapotaire, CIEC.
An introduction to the indoor air quality challenges for Florida's Real Estate Professionals. by John Lapotaire, CIEC. Microshield Environmental Services, LLC.
John P. Lapotaire, CIEC
Microshield Environmental Services, LLC
www.FloridaIAQ.com
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Multi-source connectivity as the driver of solar wind variability in the heli...Sérgio Sacani
The ambient solar wind that flls the heliosphere originates from multiple
sources in the solar corona and is highly structured. It is often described
as high-speed, relatively homogeneous, plasma streams from coronal
holes and slow-speed, highly variable, streams whose source regions are
under debate. A key goal of ESA/NASA’s Solar Orbiter mission is to identify
solar wind sources and understand what drives the complexity seen in the
heliosphere. By combining magnetic feld modelling and spectroscopic
techniques with high-resolution observations and measurements, we show
that the solar wind variability detected in situ by Solar Orbiter in March
2022 is driven by spatio-temporal changes in the magnetic connectivity to
multiple sources in the solar atmosphere. The magnetic feld footpoints
connected to the spacecraft moved from the boundaries of a coronal hole
to one active region (12961) and then across to another region (12957). This
is refected in the in situ measurements, which show the transition from fast
to highly Alfvénic then to slow solar wind that is disrupted by the arrival of
a coronal mass ejection. Our results describe solar wind variability at 0.5 au
but are applicable to near-Earth observatories.
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
Slide 1: Title Slide
Extrachromosomal Inheritance
Slide 2: Introduction to Extrachromosomal Inheritance
Definition: Extrachromosomal inheritance refers to the transmission of genetic material that is not found within the nucleus.
Key Components: Involves genes located in mitochondria, chloroplasts, and plasmids.
Slide 3: Mitochondrial Inheritance
Mitochondria: Organelles responsible for energy production.
Mitochondrial DNA (mtDNA): Circular DNA molecule found in mitochondria.
Inheritance Pattern: Maternally inherited, meaning it is passed from mothers to all their offspring.
Diseases: Examples include Leber’s hereditary optic neuropathy (LHON) and mitochondrial myopathy.
Slide 4: Chloroplast Inheritance
Chloroplasts: Organelles responsible for photosynthesis in plants.
Chloroplast DNA (cpDNA): Circular DNA molecule found in chloroplasts.
Inheritance Pattern: Often maternally inherited in most plants, but can vary in some species.
Examples: Variegation in plants, where leaf color patterns are determined by chloroplast DNA.
Slide 5: Plasmid Inheritance
Plasmids: Small, circular DNA molecules found in bacteria and some eukaryotes.
Features: Can carry antibiotic resistance genes and can be transferred between cells through processes like conjugation.
Significance: Important in biotechnology for gene cloning and genetic engineering.
Slide 6: Mechanisms of Extrachromosomal Inheritance
Non-Mendelian Patterns: Do not follow Mendel’s laws of inheritance.
Cytoplasmic Segregation: During cell division, organelles like mitochondria and chloroplasts are randomly distributed to daughter cells.
Heteroplasmy: Presence of more than one type of organellar genome within a cell, leading to variation in expression.
Slide 7: Examples of Extrachromosomal Inheritance
Four O’clock Plant (Mirabilis jalapa): Shows variegated leaves due to different cpDNA in leaf cells.
Petite Mutants in Yeast: Result from mutations in mitochondrial DNA affecting respiration.
Slide 8: Importance of Extrachromosomal Inheritance
Evolution: Provides insight into the evolution of eukaryotic cells.
Medicine: Understanding mitochondrial inheritance helps in diagnosing and treating mitochondrial diseases.
Agriculture: Chloroplast inheritance can be used in plant breeding and genetic modification.
Slide 9: Recent Research and Advances
Gene Editing: Techniques like CRISPR-Cas9 are being used to edit mitochondrial and chloroplast DNA.
Therapies: Development of mitochondrial replacement therapy (MRT) for preventing mitochondrial diseases.
Slide 10: Conclusion
Summary: Extrachromosomal inheritance involves the transmission of genetic material outside the nucleus and plays a crucial role in genetics, medicine, and biotechnology.
Future Directions: Continued research and technological advancements hold promise for new treatments and applications.
Slide 11: Questions and Discussion
Invite Audience: Open the floor for any questions or further discussion on the topic.
A brief information about the SCOP protein database used in bioinformatics.
The Structural Classification of Proteins (SCOP) database is a comprehensive and authoritative resource for the structural and evolutionary relationships of proteins. It provides a detailed and curated classification of protein structures, grouping them into families, superfamilies, and folds based on their structural and sequence similarities.
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Sérgio Sacani
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes
on Io’s surface have been monitored from both spacecraft and ground-based telescopes.
Here, we present the highest spatial resolution images of Io ever obtained from a groundbased telescope. These images, acquired by the SHARK-VIS instrument on the Large
Binocular Telescope, show evidence of a major resurfacing event on Io’s trailing hemisphere. When compared to the most recent spacecraft images, the SHARK-VIS images
show that a plume deposit from a powerful eruption at Pillan Patera has covered part
of the long-lived Pele plume deposit. Although this type of resurfacing event may be common on Io, few have been detected due to the rarity of spacecraft visits and the previously low spatial resolution available from Earth-based telescopes. The SHARK-VIS instrument ushers in a new era of high resolution imaging of Io’s surface using adaptive
optics at visible wavelengths.
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
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2. Introduction
Bioaerosols are integral part of our ecological system and play an important
role in its balance
Viruses, bacteria, fungi etc. are collectively called airborne biological
contaminants or Bioaerosols
Outdoor control of Bioaerosols is usually not possible but indoors, it is
achievable
Most of the Bioaerosols host on humans and moist places, which provide
habitable conditions
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3. General health Effects
Bioaerosols induce into human body by inhalation or by deposition on wounds
A possible reason of sick building syndrome (SBS) is the presence of
Bioaerosols in the building.
Despite the defense mechanism of the body these Bioaerosols could cause
damage to the body
The infections caused due to the Bioaerosols include:
Legionnaire’s disease
Humidifier fever
Cold
Influenza
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4. Health Effects of Bioaerosols
Viruses: Common cold, Influenza, Measles, Bronchitis
Rheumatic fever, Otitis media, Carditis, Diphtheria
Whooping cough, Tuberculosis, Meningitis and Q – fever
Fungi: Histoplasmosis, Cocciodomycosis and Blastomycosis
Antigens: Allergic diseases of hypersensitivity pneumonitis (HP)
Allergic asthma, Rhynitis and Pergillosis
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5. FUNGI
Fungi play a major role causing many ill-effects.
These are found in very ecological niche, and are necessary in the recycling of
organic building blocks that allow plant and animal lives to thrive.
Fungi need external organic food sources and water to survive.
Various groups of fungi are:
Yeasts
Molds
Mildews
Let us now know about molds, greatest problem creator for the researchers
now.
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6. Molds
Molds can grow on clothes, carpets, leather, wood, sheet rock, insulation and
on human foods wherever moist conditions exist.
As molds flourish in moist or wet indoor conditions, human exposure is
possible either by direct contact on surfaces or through the air if mold spores,
fragments, or mold products are airborne.
Mold reproduction is done by production of spores.
To support the mold growth proper conditions and food sources are provided
by wet indoor spaces with inorganic materials.
People are exposed to this mold spores or fragments through inhalation or by
contact through small breaks in skin.
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7. Various effects of molds
Effects of molds depend mainly on
Species of mold
Metabolic products being produced by molds
Amount and duration of individual’s exposure to mold parts or products
Specific susceptibility of those exposed.
Various health effects:
Allergy
Infection
Irritation (mucous membrane and sensory)
Toxicity
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8. Allergy
This is the most common response from people to mold.
People who are genetically capable of producing an allergic reaction are
referred to as atrophic.
When an atrophic person’s respiratory system or skin is exposed to mold or
mold products that have become sensitized, symptoms will be developed.
Allergic reactions range from mild transitory responses, to severe chronic
illnesses.
In Americans one in every five suffer from allergic rhinitis, the single most
common disease that is experienced by humans.
Thousands of different molds contaminate indoor air, purified allergens have
been recovered from only a few.
So, atrophic individuals may be exposed to molds found indoors and develop
sensitization, yet not be identified as having mold allergy.
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9. Infection
Infection from molds that grow indoor is not common.
A number of Aspergillus species that are found indoors are known to be
pathogenic.
Most of the infections occur among immune-compromised patients, whoa re
suffering from various causes as well.
Such infections mostly effect the skin, eyes and lungs and are also known to
effect other organs or systems.
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10. Mucous Membrane and Trigeminal Nerve
Irritation
This type of irritation is derived from VOC’s that are produced by fungal
metabolism.
Alcohol or aldehydes and acidic molecules may be produced by this fungi.
The nature of the food source from which the fungus grows may result in
pungent primary metabolic products, for instance, one fungus growing on wall
paper released the highly toxic gas arsenic from arsenic containing pigments.
Fungal volatile compounds may also impact the “common chemical sense”
associated with the trigeminal nerve, which is a mixed (motor and sensory)
nerve that responds to pungency, not odor, by initiating avoidance reactions
such as breath holding, paresthesias, itching, burning, skin crawling, dilation
of surface blood vessels, decreased attention, disorientation, diminished reflex
time, dizziness etc.
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11. Toxicity
Molds can also produce myotoxins, that are nearly cytotoxic and interfere with
vital cellular processes such as protein, RNA and DNA synthesis.
Mold toxins increase the susceptibility of the exposed person to infectious
diseases, reduce the ability of their defense system to fight against other
contaminants and can also increase susceptibility to cancer.
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13. Sources of Bioaerosols
Major sources of bacteria and viruses are humans and pets - sneezing,
coughing, dander and saliva
Fungi, many bacteria, protozoa, algae and green plants (pollen) are present
outdoors that are induced indoors by natural or mechanical ventilation
Moist surfaces of leather, wood, carpets, soaps, cloth fabric, some pastes and
adhesives are examples of amplification sites
Breeding sites for fungi and bacteria are humidifiers, air conditioning systems,
cooling towers, air distributing systems and areas of water damage
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14. Types, Sizes, Pathogenic properties and
Common sources of selected Bacteria
Escherichia coli 1.1 – 1.5 x 2 – 6
(m)
Urinary tract
infections,
Diarrhea,
Dysentery
Human body
Staphylococcus
aeruginosa
0.5 – 1.0 (m)
(diameter)
Food poisoning,
Toxic shock,
Pneumonia,
Meningitis
Human body
Staphylococcus
epidermis
0.5 – 1.5 (m)
(diameter)
Cardiovascular
infections, Wound
infections, Ottis
media
Human body
Legionella
pneumonphilia
0.3 – 0.9 x 2 – 20
(m)
Legionnaire’s
disease, Pontiac
fever
Cooling towers,
Air conditioners
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16. Types, Sizes, Pathogenic properties and
Common sources of selected Viruses
Rhinovirus
0.02 – 0.03 (m)
(diameter) Common cold Human body
Influenza virus
0.08 – 0.120 (m)
(diameter) Influenza Human body
Lymphocytic
choriomeningitis
0.2 – 0.3 (m)
(diameter)
Congenital infections,
Neurological
infections
--
Coxsackie virus
0.02 - 0.03 (m)
(diameter)
Gastrointestinal
infections, Upper
respiratory infections
--
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17. Introduction to sampling Techniques
The sampling techniques are usually same as for other particles, but the
different types in Bioaerosols complicate the process
Several factors are considered to get positive or conclusive reports:
Not one sample is good for collecting all types of microorganisms
No sampling device provides for 100% recovery of Bioaerosols
The viability of Bioaerosol samples should be maintained in the sampler
for subsequent growth and identification
Efficiency of the sampler depends on the size of the particular organism
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18. Factors affecting choice of Sampling Techniques
Growth and survival of the individual organism depends on the humidity,
temperature and pH of the culture medium
Proper selection of sampling and identification media is necessary for accurate
sampling analysis
Samplers must be calibrated and used according to the manufacturer’s flow
rate specifications
Since no method is available for collection and identification or counting of all
Bioaerosols of interest, the selection of a method is guided by what is
suspected to be present
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20. Samplers preferred
High volume filters
High volume electrostatic precipitators
AGI
Impactors:
Anderson impactors
Silt impactors
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21. Recommended samplers as per volume to be
handled
Sampler type Principle
of
Operation
Sampling
rate
(l/min)
Recommended sampling type
Silt impactor Impaction on
rotation or
stationary
plate
30 – 700,
Continuous
1- 60 min or 7 days
Cassette filter Filtration 1 – 2 15 – 60 min or 8 hrs
High volume filtration Filtration 140 - 1400 5 min to 24 hrs
High volume electrostatic filter Electrostatic
collection
Up to 12000 Variable
All glass impinger Impingement
into liquid
12.5 30 min
Sieve
Impactor
Single
stage
Impaction on
agar “rodac”
plate
90 or 185 0.5 or 0.3 min
Single
stage
Impaction on
agar 100 mm
plate
28 1 min
Two
stage
Impaction on
agar
28 1 – 5 min
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22. Control Strategies
Source Removal
After identifying the airborne microorganisms the source can either be
eliminated or its strength can be reduced
Regular Maintenance
Preventive maintenance is one the most effective ways to control the
microorganisms indoors
Maintenance of air handling systems and fan coil units, drain pans and
periodic replacement of the filters
Humidifiers using the re-circulated water should not be used. Steam
should be used instead of cold water in humidifiers, heating and HVAC
systems
Disinfectants and biocides should be used in the humidifier water
reservoirs, which kill the microorganisms
Shock dosages have better results compared to the regular dosages
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23. Biocides for controlling the most common
Legionella pneumophilia :
Quaternary ammonia compounds
1-bromo3-chloro-5
5-dimethyl-hydantoin
Bis(tri-n-butyltin)oxide
n-alkyl-1
Methylene-bis
Dithiocarbamates
Chlorine
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24. Methods for controlling molds
There is no practical way to eliminate mold and mold spores in the indoor
environment, the way to control indoor mold growth is to control moisture.
If mold problem is their in your house or school, you must clean up the mold
and eliminate sources of moisture.
Fix the source of water problem or leak to prevent mold growth.
Reduce indoor humidity ( to 30%-60%) to decrease mold growth by:
- Venting bathrooms, dryers and other moisture-generating sources to the
outside
- using air conditioners and de-humidifiers
- Increasing ventilation
- Using exhaust fans whenever cooking, dishwashing and cleaning
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25. Methods for controlling molds (contd…)
Clean and dry any damp or wet building materials and furnishings within 24-
48 hours to prevent mold growth.
Clean mold off hard surfaces with water and detergent, and dry completely.
Absorbent materials such as ceiling tiles, that are moldy, may need to be
replaced.
Prevent condensation:Reduce the potential for condensation on cold surfaces
(i. e. ,windows, piping, exterior walls, roof, or floors) by adding insulation.
In areas where there is a perpetual moisture problem, do not install carpeting
(i. e. , by drinking fountains, by classroom sinks, or on concrete floors with
leaks or frequent condensation)
Molds can be found almost anywhere; they can grow on virtually any
substance, providing moisture is present. There are molds that can grow on
wood, paper, carpet and foods.
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26. Other Strategies
Humidity control
Control of relative humidity significantly reduces the bacteria and viruses
Maximum growth of viruses resulted at a relative humidity of 95% and
above
Humidity range between 40% and 60% significantly reduces the risk to
human health
Increased ventilation with filtration
Proper intake of air indoor and using effective air filtration systems
significantly reduces the intake of Bioaerosols
Mechanical filters have been successful in removing the fungi and other
microbial agents from the outdoor air
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27. Other Strategies(contd.)
Available air filters
Coarse-fiber panel filters (efficiency – 10%)
Electrostatic precipitators (efficiency – 60% to 90%)
HEPA filters (efficiency – 90% to 100%)
Air cleaning
The air can be disinfected using various chemical compounds
Sodium hypochlorite
Hydroxy acids
Glycols
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28. Criteria for choosing Chemical disinfectants
Lethal at low concentrations
Non-toxic and non-irritant to humans
Non-corrosive to metals and fabric
Should easily vaporize
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29. Other preferred options
The most effective glycols are propylene and triethylene glycols
Desiccant air conditioning systems perform well in control of the Bioaerosols
by:
Capturing the organisms
Killing them through severe desiccation
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