This document discusses quinolone resistance in bacteria. Quinolones are broad-spectrum synthetic antibacterial drugs that target bacterial DNA gyrase and topoisomerase IV enzymes. Resistance can occur via four main mechanisms: chromosomal mutations in gyrase and topoisomerase genes, increased efflux of drugs, alterations in cell membranes, and plasmid-mediated resistance involving qnr genes. Experiments show that Qnr proteins can protect DNA gyrase from inhibition by ciprofloxacin in a concentration-dependent manner. Point mutations in specific regions of gyrase genes can also enhance quinolone resistance.
review on virulence factors of bacteria done by Mohammed Bushera
knowledge about bacterial virulence factors is a key for medicene or vaccine production, that why I want to share this ppt to the public
The presentation include semisynthetic penicillin introduction and classification.
Contents
Semisynthetic penicillins- Introduction
Classification
Acid-resistant alternative to Penicillin G
Penicillinase- resistant penicillins
Extended spectrum penicillins
vaccine is a biological preparation that provides active acquired immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, and to further recognize and destroy any of the microorganisms associated with that agent that it may encounter in the future.
HISTORY OF VACCINES-
EDWARD JENNER conduct experiments in 1796 that lead to the creation of the first smallpox vaccine for prevention of smallpox.
A vaccine for RABIES is developed by LOUIS PASTEUR .
Vaccine for COLERA and TYPHOID were developed in 1896 and PLAGE vaccine in 1887.
The first DIPHTHERIA vaccine is developed in about 1913 by EMIL ADOLPH BEHRING,WILLIAM HALLOCK PARK.
The whole cell PERTUSIS vaccines are developed in 1914.
A TETANUS vaccine is developed in 1927.
review on virulence factors of bacteria done by Mohammed Bushera
knowledge about bacterial virulence factors is a key for medicene or vaccine production, that why I want to share this ppt to the public
The presentation include semisynthetic penicillin introduction and classification.
Contents
Semisynthetic penicillins- Introduction
Classification
Acid-resistant alternative to Penicillin G
Penicillinase- resistant penicillins
Extended spectrum penicillins
vaccine is a biological preparation that provides active acquired immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, and to further recognize and destroy any of the microorganisms associated with that agent that it may encounter in the future.
HISTORY OF VACCINES-
EDWARD JENNER conduct experiments in 1796 that lead to the creation of the first smallpox vaccine for prevention of smallpox.
A vaccine for RABIES is developed by LOUIS PASTEUR .
Vaccine for COLERA and TYPHOID were developed in 1896 and PLAGE vaccine in 1887.
The first DIPHTHERIA vaccine is developed in about 1913 by EMIL ADOLPH BEHRING,WILLIAM HALLOCK PARK.
The whole cell PERTUSIS vaccines are developed in 1914.
A TETANUS vaccine is developed in 1927.
Continuous Integration: Getting your department to drink the Kool-AidJenKnight
Everyone wants automated regression, automated builds, and single click deployments. Who wouldn’t want day to day development blockers eliminated. However, getting these things happening in your office might often face fierce resistance. Here is how one small department banded together for success.
Presented by Jen Knight, Michael Benning
History, definition, need, attributes, applications of data warehousing ; difference between data mining, big data, database and data warehouse ; future scope
Nimalox is a non steroidal anti inflammatory drug with
analgesic and antipyretic properties and cox-2
selective inhibition
it's a study to re-branding Nimalox
MBA Cairo University
antibiotics in xdr organism,the mechanism of resistance ,cause of resistance ,effect of resistance, levels of resistance, classification, xdr organisms, gram positive and gram negative ,detection and latest idsa guidelines for management.
ambler classification and detection
latest antibiotics and mechanism of action of new antibiotics.
DNA Gyrase Inhibitors -Quinolones,Fluoroquinolones Vijay Salvekar
DNA Gyrase Inhibitors -Quinolones,Fluoroquinolones ,its Structure,Antimicrobial activity ,Mechanism of action,classifications ,Mechanisms of Resistance,Pharmacokinetics,Clinical uses,Adverse effects
DNA Gyrase Inhibitors -quinolones and Fluoroquinolones.pptxVijay Salvekar
DNA gyrase inhibitors of synthetic origin. Fluoroquinolones have been the most successful antibacterial agents targeting DNA gyrase. These compounds have been extensively explored and researched to improve spectrum of activity, potency and bacterial resistance.
synthetic antimicrobials having a quinolone structure that are active primarily against gram-negative bacteria, though newer fluorinated compounds also inhibit gram-positive ones.
Quinolones are synthetic, bactericidal antibacterial agents with broad-spectrum activity. They inhibit the enzyme topoisomerase II, a DNA gyrase that is necessary for the replication of the microorganism.
Recent outbreak of diseases related to humans.MedhaPathak2
Recently we have faced many outbreak of human diseases throughout the world, one of them being COVID-19. This presentation gives a detailed information about these outbreaks. Main focus is on COVID-19 as it is the prevailing outbreak.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
This presentation explores a brief idea about the structural and functional attributes of nucleotides, the structure and function of genetic materials along with the impact of UV rays and pH upon them.
Introduction:
RNA interference (RNAi) or Post-Transcriptional Gene Silencing (PTGS) is an important biological process for modulating eukaryotic gene expression.
It is highly conserved process of posttranscriptional gene silencing by which double stranded RNA (dsRNA) causes sequence-specific degradation of mRNA sequences.
dsRNA-induced gene silencing (RNAi) is reported in a wide range of eukaryotes ranging from worms, insects, mammals and plants.
This process mediates resistance to both endogenous parasitic and exogenous pathogenic nucleic acids, and regulates the expression of protein-coding genes.
What are small ncRNAs?
micro RNA (miRNA)
short interfering RNA (siRNA)
Properties of small non-coding RNA:
Involved in silencing mRNA transcripts.
Called “small” because they are usually only about 21-24 nucleotides long.
Synthesized by first cutting up longer precursor sequences (like the 61nt one that Lee discovered).
Silence an mRNA by base pairing with some sequence on the mRNA.
Discovery of siRNA?
The first small RNA:
In 1993 Rosalind Lee (Victor Ambros lab) was studying a non- coding gene in C. elegans, lin-4, that was involved in silencing of another gene, lin-14, at the appropriate time in the
development of the worm C. elegans.
Two small transcripts of lin-4 (22nt and 61nt) were found to be complementary to a sequence in the 3' UTR of lin-14.
Because lin-4 encoded no protein, she deduced that it must be these transcripts that are causing the silencing by RNA-RNA interactions.
Types of RNAi ( non coding RNA)
MiRNA
Length (23-25 nt)
Trans acting
Binds with target MRNA in mismatch
Translation inhibition
Si RNA
Length 21 nt.
Cis acting
Bind with target Mrna in perfect complementary sequence
Piwi-RNA
Length ; 25 to 36 nt.
Expressed in Germ Cells
Regulates trnasposomes activity
MECHANISM OF RNAI:
First the double-stranded RNA teams up with a protein complex named Dicer, which cuts the long RNA into short pieces.
Then another protein complex called RISC (RNA-induced silencing complex) discards one of the two RNA strands.
The RISC-docked, single-stranded RNA then pairs with the homologous mRNA and destroys it.
THE RISC COMPLEX:
RISC is large(>500kD) RNA multi- protein Binding complex which triggers MRNA degradation in response to MRNA
Unwinding of double stranded Si RNA by ATP independent Helicase
Active component of RISC is Ago proteins( ENDONUCLEASE) which cleave target MRNA.
DICER: endonuclease (RNase Family III)
Argonaute: Central Component of the RNA-Induced Silencing Complex (RISC)
One strand of the dsRNA produced by Dicer is retained in the RISC complex in association with Argonaute
ARGONAUTE PROTEIN :
1.PAZ(PIWI/Argonaute/ Zwille)- Recognition of target MRNA
2.PIWI (p-element induced wimpy Testis)- breaks Phosphodiester bond of mRNA.)RNAse H activity.
MiRNA:
The Double-stranded RNAs are naturally produced in eukaryotic cells during development, and they have a key role in regulating gene expression .
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.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
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.
Nutraceutical market, scope and growth: Herbal drug technologyLokesh Patil
As consumer awareness of health and wellness rises, the nutraceutical market—which includes goods like functional meals, drinks, and dietary supplements that provide health advantages beyond basic nutrition—is growing significantly. As healthcare expenses rise, the population ages, and people want natural and preventative health solutions more and more, this industry is increasing quickly. Further driving market expansion are product formulation innovations and the use of cutting-edge technology for customized nutrition. With its worldwide reach, the nutraceutical industry is expected to keep growing and provide significant chances for research and investment in a number of categories, including vitamins, minerals, probiotics, and herbal supplements.
Richard's entangled aventures in wonderlandRichard 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.
9. qnrA,( was found to protect E. coli DNA gyrase
from inhibition by ciprofloxacin.)
qnrS1 (from Shigella flexneri 2b)
qnrB1 (from K. pneumoniae)
qnr gene:-
10. qnr ???
Present within a integron like environment upstream from qacEΔ1 and
suI1.
218 Amino Acid protein –
pentapeptide repeat
family(homologous to
McbG)
11. Experiment
AIM
The ability of qnr to reverse the gyrase activity
by quinolones
qnr protection of Dna gyrase is propoRtional
concentration.
Dependence of Qnr protection on
ciprofloxacin concentration
12. The ability of Qnr to reverse
the gyrase activity by quinolones.
Case 1:-
1 2 3 4 5 6
DNA Gyrase + + + + +
Ciprofloxacin
(.5µg/ml)
+ + + +
Qnr ++ +
13. 1 2 3 4 5 6 7 8 9 10
DNA Gyrase + + + + + + + + +
ciprofloxacin + + + + + + + +
Qnr +++ + + + + + +
Qnr protection of Dna gyrase is proportional
to concentration .
96%
75%
31%
No Protection Zone
(less than 81 nM)
Case 2:-
15. Effect of Qnr
Gyrase
Protection was
inversly
proportional to
Concentration of
ciprofloxacin
Gyrase
Protection was
proportional to
Concentration of
qnr.
16. The conserved domain of the gyrA N-terminus
-quinolone resistance determining
region (QRDR).
Ala51 –Val
Ala67-Ser
Asp86-Ala
Gln106-his
Distort the
drug binging
region
Chromosomal point mutations enhances
quinolones resistance :-
18. Alterations in Efflux
• The multidrug efflux system AcrA-AcrB-
TolC
• mediator of quinolone efflux in E. coli
• primary mechanism of fluoroquinolone
resistance in Salmonella
19. Conclusion
Quinolones resistant in bacteria can take place in
following ways:
1.Mutation in Chromosome.
2 Alteration in the efflux
3.Change in OMPs and LPS
4 Plasmid mediated resistance results due to Qnr
which can inhibit the drug action
