Prokaryotic cells are the earliest and most primitive forms of life on Earth. They include bacteria and archaea and some are capable of photosynthesis. Prokaryotic cells have no nucleus and their DNA is located in the nucleoid region of the cytoplasm. They reproduce through binary fission and can also undergo genetic recombination through conjugation, transformation, or transduction to generate variation. Prokaryotic cells play important roles in various environments and as normal flora in humans and animals.
Cell structure, prokaryotice cell, eukaryotic cell, organization of the cellBiren Daftary
11th Std Maharashtra board Biology Syllabus: Organization of the cell. This is a powerpoint presentation to clear the doubts based on the basic concepts of the chapter. All the videos have their respective copyrights and copying or sharing of the powerpoint is not permitted.
Cell structure, prokaryotice cell, eukaryotic cell, organization of the cellBiren Daftary
11th Std Maharashtra board Biology Syllabus: Organization of the cell. This is a powerpoint presentation to clear the doubts based on the basic concepts of the chapter. All the videos have their respective copyrights and copying or sharing of the powerpoint is not permitted.
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
2.) Evaluate emerging data on targeted therapeutic approaches for treatment-naive and relapsed/refractory MCL and their applicability to older adults
3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
Lung Cancer: Artificial Intelligence, Synergetics, Complex System Analysis, S...Oleg Kshivets
RESULTS: Overall life span (LS) was 2252.1±1742.5 days and cumulative 5-year survival (5YS) reached 73.2%, 10 years – 64.8%, 20 years – 42.5%. 513 LCP lived more than 5 years (LS=3124.6±1525.6 days), 148 LCP – more than 10 years (LS=5054.4±1504.1 days).199 LCP died because of LC (LS=562.7±374.5 days). 5YS of LCP after bi/lobectomies was significantly superior in comparison with LCP after pneumonectomies (78.1% vs.63.7%, P=0.00001 by log-rank test). AT significantly improved 5YS (66.3% vs. 34.8%) (P=0.00000 by log-rank test) only for LCP with N1-2. Cox modeling displayed that 5YS of LCP significantly depended on: phase transition (PT) early-invasive LC in terms of synergetics, PT N0—N12, cell ratio factors (ratio between cancer cells- CC and blood cells subpopulations), G1-3, histology, glucose, AT, blood cell circuit, prothrombin index, heparin tolerance, recalcification time (P=0.000-0.038). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and PT early-invasive LC (rank=1), PT N0—N12 (rank=2), thrombocytes/CC (3), erythrocytes/CC (4), eosinophils/CC (5), healthy cells/CC (6), lymphocytes/CC (7), segmented neutrophils/CC (8), stick neutrophils/CC (9), monocytes/CC (10); leucocytes/CC (11). Correct prediction of 5YS was 100% by neural networks computing (area under ROC curve=1.0; error=0.0).
CONCLUSIONS: 5YS of LCP after radical procedures significantly depended on: 1) PT early-invasive cancer; 2) PT N0--N12; 3) cell ratio factors; 4) blood cell circuit; 5) biochemical factors; 6) hemostasis system; 7) AT; 8) LC characteristics; 9) LC cell dynamics; 10) surgery type: lobectomy/pneumonectomy; 11) anthropometric data. Optimal diagnosis and treatment strategies for LC are: 1) screening and early detection of LC; 2) availability of experienced thoracic surgeons because of complexity of radical procedures; 3) aggressive en block surgery and adequate lymph node dissection for completeness; 4) precise prediction; 5) adjuvant chemoimmunoradiotherapy for LCP with unfavorable prognosis.
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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Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
Explore natural remedies for syphilis treatment in Singapore. Discover alternative therapies, herbal remedies, and lifestyle changes that may complement conventional treatments. Learn about holistic approaches to managing syphilis symptoms and supporting overall health.
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.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
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!
3. Prokaryotes are single-celled organisms that are the
earliest and most primitive forms of life on earth. As
organized in the Three Domain System, prokaryotes
include bacteria and archaeans. Some prokaryotes,
such as cyanobacteria, are photosynthetic
organisms and are capable of photosynthesis
6. Many prokaryotes are extremophiles and are able to
live and thrive in various types of extreme
environments including hydrothermal vents, hot
springs, swamps, wetlands, and the guts of humans
and animals (Helicobacter pylori). Prokaryotic
bacteria can be found almost anywhere and are part
of the human microbiota. They live on your skin, in
your body, and on everyday objects in your
environment.
7. Prokaryotic Cell Structure
Prokaryotic cells are not as complex as eukaryotic
cells. They have no true nucleus as the DNA is not
contained within a membrane or separated from the
rest of the cell, but is coiled up in a region of
the cytoplasm called the nucleoid. Prokaryotic
organisms have varying cell shapes. The
most common bacteria shapes are spherical, rod-
shaped, and spiral.
8. Prokaryotic Cell Structure
Using bacteria as our sample prokaryote, the following structures and organelles can be
found in bacterial cells:
Capsule - Found in some bacterial cells, this additional outer covering protects the cell when
it is engulfed by other organisms, assists in retaining moisture, and helps the cell adhere to
surfaces and nutrients.
Cell Wall - The cell wall is an outer covering that protects the bacterial cell and gives it
shape.
Cytoplasm - Cytoplasm is a gel-like substance composed mainly of water that also contains
enzymes, salts, cell components, and various organic molecules.
Cell Membrane or Plasma Membrane - The cell membrane surrounds the cell's cytoplasm
and regulates the flow of substances in and out of the cell.
Pili (Pilus singular)- Hair-like structures on the surface of the cell that attach to other
bacterial cells. Shorter pili called fimbriae help bacteria attach to surfaces.
Flagella - Flagella are long, whip-like protrusion that aids in cellular locomotion.
Ribosomes - Ribosomes are cell structures responsible for protein production.
Plasmids - Plasmids are gene carrying, circular DNA structures that are not involved in
reproduction.
Nucleiod Region - Area of the cytoplasm that contains the single bacterial DNA molecule.
9. Prokaryotic cells lack organelles found in
eukaryotic cells such
as mitochondria, endoplasmic reticuli,
and Golgi complexes. According to
the Endosymbiotic Theory, eukaryotic
organelles are thought to have evolved
from prokaryotic cells living in
endosymbiotic relationships with one
another.
10. Like plant cells, bacteria have a cell wall. Some bacteria
also have a polysaccharide capsule layer surrounding the
cell wall. It is in this layer where bacteria
produce biofilm, a slimy substance that helps bacterial
colonies adhere to surfaces and to each other for
protection against antibiotics, chemicals, and other
hazardous substances. Similar to plants and algae, some
prokaryotes also have photosynthetic pigments. These
light-absorbing pigments enable photosynthetic bacteria
to obtain nutrition from light.
11. Binary Fission
E. coli bacteria undergoing binary fission. The cell
wall is dividing resulting in the formation of two
cells.
12.
13. Most prokaryotes reproduce sexually through a
process called binary fission. During binary fission,
the single DNA molecule replicates and the original
cell is divided into two identical cells.
14. Steps of Binary Fission
Binary fission begins with DNA replication of the single DNA
molecule. Both copies of DNA attach to the cell membrane.
Next, the cell membrane begins to grow between the two DNA
molecules. Once the bacterium just about doubles its original size,
the cell membrane begins to pinch inward.
A cell wall then forms between the two DNA molecules dividing
the original cell into two identical daughter cells.
Although E.coli and other bacteria most commonly reproduce by
binary fission, this mode of reproduction does not produce genetic
variation within the organism.
15. Prokaryotic Recombination
Genetic variation within prokaryotic organisms
is accomplished through recombination. In
recombination, genes from one prokaryote are
incorporated into the genome of another prokaryote.
Recombination is accomplished in bacterial
reproduction by the processes of conjugation,
transformation, or transduction.
16. Prokaryotic Recombination
In conjugation, bacteria connect with one another through a
protein tube structure called a pilus. Genes are transferred
between bacteria through the pilus.
In transformation, bacteria take up DNA from their
surrounding environment. The DNA is transported across the
bacterial cell membrane and incorporated into the bacterial
cell's DNA.
Transduction involves the exchange of bacterial DNA
through viral infection. Bacteriophages, viruses that
infect bacteria, transfer bacterial DNA from previously
infected bacteria to any additional bacteria that they infect.