This document provides an overview of bacteria, including their morphology, reproduction, functions, and role in food microbiology. It describes bacteria as microscopic single-celled organisms that are found everywhere and come in various shapes. Bacteria reproduce through binary fission or genetic transfer. Most bacteria are harmless or beneficial, while some can cause disease. The document also differentiates between probiotic and pathogenic bacteria, and discusses several types of bacteria important in food, such as lactic acid-forming and thermophilic bacteria.
General features of Proteobacteria, alpha Proteobacteria
subscribe youtube channel: Dharmesh Sherathia
https://www.youtube.com/watch?v=JxOIqxYmerk&t=348s
join me on insta @dharmesh.biology
A short yet comprehensive presentation on bacterial genetics, an important microbiology topic for BDS 2nd, MBBS 2nd and MD/MS /MDS 1st . Made using CP Baveja's Textbook of Microbiology. Meant as an introduction and overview with stress on some key areas.
Topics covered: Basic Principles, Synthesis of Protein, Extra Chromosomal Genetic Material, Bacterial Variation , Gene Transfer, Genetic Mechanisms of Drug Resistance, Genetic Engineering, DNA Probes, Polymerase Chain Reaction, Genetically Modified Organisms and Gene Therapy.
Bacteria are microscopic, single-celled organisms that thrive in diverse environments. These organisms can live in soil, the ocean and inside the human gut. Humans' relationship with bacteria is complex. Sometimes bacteria lend us a helping hand, such as by curdling milk into yogurt or helping with our digestion.
This presentation is all about the different shapes in bacteria. This can help you in determining shapes that you do in your experiments in Microbiology. Hope this can help. :-)
General features of Proteobacteria, alpha Proteobacteria
subscribe youtube channel: Dharmesh Sherathia
https://www.youtube.com/watch?v=JxOIqxYmerk&t=348s
join me on insta @dharmesh.biology
A short yet comprehensive presentation on bacterial genetics, an important microbiology topic for BDS 2nd, MBBS 2nd and MD/MS /MDS 1st . Made using CP Baveja's Textbook of Microbiology. Meant as an introduction and overview with stress on some key areas.
Topics covered: Basic Principles, Synthesis of Protein, Extra Chromosomal Genetic Material, Bacterial Variation , Gene Transfer, Genetic Mechanisms of Drug Resistance, Genetic Engineering, DNA Probes, Polymerase Chain Reaction, Genetically Modified Organisms and Gene Therapy.
Bacteria are microscopic, single-celled organisms that thrive in diverse environments. These organisms can live in soil, the ocean and inside the human gut. Humans' relationship with bacteria is complex. Sometimes bacteria lend us a helping hand, such as by curdling milk into yogurt or helping with our digestion.
This presentation is all about the different shapes in bacteria. This can help you in determining shapes that you do in your experiments in Microbiology. Hope this can help. :-)
“This structure has novel features which are of considerable biological interest.”
This may be the science most famous statement, which appeared in April 1953 in the scientific paper where James Watson and Francis Crick presented the structure of the DNA-helix.
“It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material."
“Microbes matters”. Cooperation among bacteria. Good microbes. Microbes too helps us in various ways. List of uses of microbes. The reason behind tasty foods. Microbes are useful in food production and food industries. “Fermentation may have been greater discovery than fires”. Fermentation – the main job of microbes. Brewing beer, liquors and wine. The need of microbes in agriculture. It helps in encountering of insects. Microorganisms are an important part of wastewater treatment. Contribution to medicine - thousands of antibiotics known to us are made by microorganisms. The best kind of biodegradable plastics are the ones made by bacteria because they can also be broken down by bacteria. It also helps to set up your aquarium. The complex microbial communities on and in the human body can sometimes get out of balance – Maintaining of balance. Microorganisms have evolved as a potential alternate source of energy. Microorganisms are used to produce biofuels like biodiesel, bioalcohol and also microbial fuel cell. We are all here because of an organism that changed the world and also paved the way for complex life on earth – Evolution. Microorganisms help us in researching on diseases, such as in vaccination. We conclude with the a considerations of the consequences of the these complex interactions and we briefly discuss the potential role of social interactions involving multiple traits and multiple environment constraints in the evolution of specialization and division of microbes.
Micro-organisms important in Food Microbiology. Bacteria, Yeast, MoldsSt Xaviers
Here is a ppt on food microbiology. consisting information for molds, bacteria and yeast. information on types of good and bad components in each category.
In the presentation I have shown the various ways the microbes help us in our day to day life. There are different types of microbes in and around us who help us in ways we even don't know about. Please comment if any improvement needed.
Many people are allergic towards different foods. But what is introlerance to deal with. How are allergy and intolerance related? know about them in this presentation
Ethanol (CH3CH2OH), or beverage alcohol, is a two-carbon alcohol
that is rapidly distributed in the body and brain. Ethanol alters many
neurochemical systems and has rewarding and addictive properties. It
is the oldest recreational drug and likely contributes to more morbidity,
mortality, and public health costs than all illicit drugs combined. The
5th edition of the Diagnostic and Statistical Manual of Mental Disorders
(DSM-5) integrates alcohol abuse and alcohol dependence into a single
disorder called alcohol use disorder (AUD), with mild, moderate,
and severe subclassifications (American Psychiatric Association, 2013).
In the DSM-5, all types of substance abuse and dependence have been
combined into a single substance use disorder (SUD) on a continuum
from mild to severe. A diagnosis of AUD requires that at least two of
the 11 DSM-5 behaviors be present within a 12-month period (mild
AUD: 2–3 criteria; moderate AUD: 4–5 criteria; severe AUD: 6–11 criteria).
The four main behavioral effects of AUD are impaired control over
drinking, negative social consequences, risky use, and altered physiological
effects (tolerance, withdrawal). This chapter presents an overview
of the prevalence and harmful consequences of AUD in the U.S.,
the systemic nature of the disease, neurocircuitry and stages of AUD,
comorbidities, fetal alcohol spectrum disorders, genetic risk factors, and
pharmacotherapies for AUD.
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
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Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
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Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
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TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
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These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
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NVBDCP.pptx Nation vector borne disease control programSapna Thakur
NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
2. Bacteria are microscopic organisms that live in the air, soil and water, on
surfaces, and in and on the human body.
They are the smallest free-living organisms, meaning they support their
own growth and reproduction.
These organisms are only about two-thousandth of a millimeter in size.
Most bacteria are harmless and, in fact, perform useful functions.
Many of the bacteria in the body protect against the harmful effects of other
organisms.
When they enter internal tissues, however, bacteria can cause disease,
discomfort and even death.
What are Bacteria?
7/16/2016
3. Morphology Of Bacteria:
Size
0.2 µm – 0.1 mm
Most 0.5 – 5.0 µm
Shape
Coccus shape (cocci); rod shape (bacillus, bacilli); spiral shapes
(spirochetes; spirillum, spirilla); filamentous; various odd shapes.
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5. An overview of Bacterial cell: Bacillus species
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6. Cell wall:
Outmost portion of the cell.
15-30nm in thickness
10%-25% of dry weight.
Functions:
Maintaining the cell's characteristic shape- the rigid wall
compensates for the flexibility of the phospholipid membrane
and keeps the cell from assuming a spherical shape.
Play an essential role in cell division.
Providing attachment sites for bacteriophages
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7. Cell Membrane:
Site of biosynthesis of DNA, cell wall polymers and membrane lipids.
Selective permeability and transport of solutes into cells
Electron transport and oxidative phosphorylation.
Excretion of hydrolytic exo-enzymes.
Cytoplasm:
Composed largely of water, together with proteins, nucleic acid, lipids
and small amount of sugars and salts
Ribosomes: numerous, 15-20nm in diameter; distributed throughout the
cytoplasm.
Plasmids: extrachromosomal genetic elements
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8. Pili:
Pili are hair-like projections of the cell , They are known to be receptors for
certain bacterial viruses. Chemical nature is pilin.
Classification and Function:
Common pili or fimbriae: fine , rigid numerous, related to bacterial adhesion.
Sex pili: longer and coarser, only 1-4, related to bacterial conjugation.
Flagellum:
The primary role of the flagellum is locomotion but it also often
has function as a sensory organelle, being sensitive to chemicals and
temperatures outside the cell.
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10. Binary Fission:
One parent involved
Offspring are identical to parent & each other
Advantages:
simple: only 1 parent
offspring are fully formed (no maturation needed)
very fast (20 min. in ideal conditions)
Asexual mode of reproduction:
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12. Two parents are involved
Offspring are genetically different to parents & to each other.
Advantages:
Genetic variety i.e. some are able to adapt to unfavourable conditions (ex:
antibiotic resistance)
Disadvantages:
More complex: slower because must find a compatible partner.
No new individuals produced (i.e. no increase in population)
Sexual mode of reproduction:
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13. plasmid
pili
• plasmid copies itself
• passes through pili (cytoplasmic bridge)
into recipient cell
• cells separate with both cells containing
the plasmid
donor recipient
cell (+) cell ( - )
Bacterial Conjugation:
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14. Transformation:
The alteration of a bacterial cell’s genotype and phenotype by the uptake of
foreign DNA from the surrounding environment.
Many bacteria possess cell surface proteins that facilitate transformation in
natural populations.
Transduction:
Phages (viruses that infect bacteria) carry bacterial genes from one host
cell to another as a result of mistakes in the phage reproductive cycle.
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16. Based on their functions bacteria are divided into two categories:
Good bacteria (Probiotic bacteria)
Bad bacteria (Pathogenic bacteria)
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18. Good Bacteria (Probiotic bacteria):
Supports a healthy immune system by helping to protect against harmful
bacteria.
Probiotics which are useful in the food digestion; Example: Yoghurt (curd)
Without the bacteria in the gut one cannot survive.
The best example for probiotic bacteria is Lactobacillus species which can
be seen in the yoghurt and curd.
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21. Bad bacteria or Pathogenic bacteria:
These bacteria are very contagious, which means they spread very quickly,
or they make a lot of people ill.
The bad bacteria in the environment cause lots of problems – they can cause
waste and disease. If you leave food out in the open, it will begin to
rot. This is because bacteria like food too and will eat the food you have left
out and make lots more bacteria in the process!
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22. A list of bad bacteria that are pathogenic to humans:
Streptococci sps.
Staphylocococci sps.
Clostridia sps.
Bacilli sps. etc.
The diseases that are prone to humans due to these bad bacteria are:
Escherichia coli and Salmonella cause food poisoning.
Neisseria gonorrhoeae causes the sexually transmitted disease gonorrhea.
Neisseria meningitidis causes meningitis.
Staphylococcus aureus causes a variety of infections in the body, including
pneumonia, and food poisoning.
Streptococcal bacteria cause a variety of infections in the body, including
pneumonia, meningitis, ear infections, and strep throat.
Bacterial diseases are contagious and can result in many serious or life-threatening
complications, such as blood poisoning (bacteremia), kidney failure, and toxic
shock syndrome.
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23. Bacteria that are important in Food microbiology:
Lactic acid – forming bacteria or lactics:
These bacteria ferment sugars to lactic acid. This may be desirable in making
products such as sauerkraut and cheese. But undesirable in terms of spoilage
of wines because they usually form acid rapidly.
Ex: Leuconostoc, Lacto bacillus, Streptococcus and Pediococcus
Acetic acid forming bacteria or acetics:
Most of the acetic acid belong to two genera Acetobacter and Gluconobacter.
Both oxidize ethyl alcohol to acetic acid, but Acetobacter is capable of oxidizing
acetic acid further to CO2.
Ex: Acetobacter acetic sub sp. suboxydans
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24. Butyric acid forming bacteria or butyrics:
Most bacteria of this group are spore forming anaerobes of the genus clostridium.
Propionic acid – forming bacteria or propionics: Ex: Propionic bacterium
Proteolytic bacteria:
They produce extracellular proteinases, proteolytic bacteria may be aerobic,
facultative, spore forming, anaerobic and spore forming.
Bacillus cereus – Aerobic, spore forming
Pseudomonas fluorescens – Non spore forming and aerobic to facultative.
Clostridum sporogenes – Spore forming and anaerobic other examples are
clostridium, bacillus, proteus. Acid proteolytic bacteria carry on an acid
fermentation and proteolysis simultaneously.
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25. Thermophilic Bacteria or Thermophiles:
Optimum temperature required for these bacteria 45°C - 55°C.
Bacillus stearothermophilus – thermophilic flat sour spoilage of low acid canned
foods.
Psychotropic Bacteria or psychrotrophs:
These bacteria are able to grow at commercial refrigeration temperatures. Unlike
psychrophiles, psychrotrophs do not have their optimal temperature for growth at
refrigeration temperature and their optimum between 25°C and 30°C.
Ex: Pseudomonas, Flavobacterium, Achromobacter and Alcaligenes,
Micrococcus, Lactobacillus etc.
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26. Lipolytic Bacteria:
This bacteria produce lipases which catalyze the hydrolysis of fats to fatty
acids and glycerol. Many of the aerobic, actively proteolytic bacteria also are
lipolytic.
Ex: Pseudomonas fluorescens – Strongly lipolytic
Pseudomonas, Alcaligenes, Staphylococcus, Serratia and Micrococcus are
genera that contain lipolytic bacteria.
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