PHAR 4813

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Questions and Answers

What triggers the release of the nanoparticle in the S.aureus protease biosensor?

  • Magnetic attraction
  • Direct contact with gold
  • Exposure to light
  • Enzymatic cleavage of the amide bond (correct)

What is the purpose of the external magnets in the biosensor system?

  • To immobilize the sensor
  • To cool the sensor platform
  • To attract nanoparticles for detection (correct)
  • To enhance color resolution

What does the color change from black to gold in the S.aureus protease biosensor signify?

  • Successful enzymatic activity (correct)
  • Binding of aptamer
  • Presence of M.tuberculosis
  • Loss of substrate

In the aptamer-based Latent TB Infection Test, what is the role of the 3’-biotin-labelled aptamer?

<p>To recognize mannose-capped lipoarabinomannan (D)</p> Signup and view all the answers

What is the significance of using horseradish peroxidase (HRP) in the Latent TB Infection Test?

<p>To catalyze the oxidation of TMB (C)</p> Signup and view all the answers

What characteristic is NOT required for a bacterial surveillance method?

<p>Complexity (C)</p> Signup and view all the answers

Which statement best describes the detection method used in the Latent TB Infection Test?

<p>It employs colorimetric detection. (A)</p> Signup and view all the answers

What is the consequence of the reaction between HRP and TMB in the presence of hydrogen peroxide?

<p>Change of TMB from colorless to blue (D)</p> Signup and view all the answers

What is the quantitation limit for ManLAM when detecting bacteria?

<p>10^4 CFU/mL (A)</p> Signup and view all the answers

Which of the following properties is dependent on particle size?

<p>Melting point (B)</p> Signup and view all the answers

What does the high ratio of surface area to volume in nanoscale materials contribute to?

<p>Increased energy absorbance (A)</p> Signup and view all the answers

How is the recombinant hepatitis B vaccine produced?

<p>By inserting a plasmid into yeast (D)</p> Signup and view all the answers

What characteristic of nanoparticles allows for strong absorption at specific wavelengths?

<p>Localized surface plasmon resonance (C)</p> Signup and view all the answers

What historical milestone is associated with the recombinant hepatitis B vaccine?

<p>First licensed vaccine produced by recombinant DNA technology (C)</p> Signup and view all the answers

Why do gold nanoparticles display a red color in dispersion?

<p>Due to localized surface plasmon resonance (A)</p> Signup and view all the answers

What does nanoscience primarily deal with?

<p>Materials at meso-scale dimensions (B)</p> Signup and view all the answers

What is a consequence of decreasing particle size to below 5 nm in gold particles?

<p>Decreased melting point (C)</p> Signup and view all the answers

What does the term 'nanoscale' emphasize in materials science?

<p>High ratio of surface area to volume (B)</p> Signup and view all the answers

What is the primary purpose of biologicals in medical applications?

<p>To treat, prevent, diagnose, or modify physiological processes (C)</p> Signup and view all the answers

What document must be listed for a Class 1 application in the therapeutic goods regulation?

<p>Schedule 16 of Therapeutic Goods Regulation (B)</p> Signup and view all the answers

Which of the following is not a use of biologicals?

<p>To serve as a dietary supplement (D)</p> Signup and view all the answers

Which class of application does not require Good Manufacturing Practice (GMP)?

<p>Class 1 (C)</p> Signup and view all the answers

What major legislation regulates genetically modified organisms (GMOs) in Australia?

<p>Gene Technology Act 2000 (B)</p> Signup and view all the answers

What is the main focus of the User's Guide in relation to the Gene Technology Act?

<p>To offer plain English context for regulations and the Act (C)</p> Signup and view all the answers

Which of the following materials is currently listed in Schedule 16 of the Therapeutic Goods Regulation for Class 1 application?

<p>Faecal microbiota transplant material (C)</p> Signup and view all the answers

Which option best describes the outcome of the Gene Technology Act 2000?

<p>It established a national scheme for GMO regulation. (B)</p> Signup and view all the answers

What phenomenon describes the collective oscillation of conduction band electrons in response to incident light?

<p>Surface plasmon resonance (SPR) (D)</p> Signup and view all the answers

How does the size of metal nanoparticles affect their surface plasmon resonance?

<p>Larger nanoparticles lead to red-shifts in their SPR. (B)</p> Signup and view all the answers

What effect does aggregation of nanoparticles have on the surface plasmon band?

<p>The band red-shifts due to interparticle coupling. (B)</p> Signup and view all the answers

Which of the following trends is exhibited by the emission color of quantum dots as their size increases?

<p>It shifts from blue to green to red. (B)</p> Signup and view all the answers

Which characteristic of Au nanorods influences their longitudinal surface plasmon resonance?

<p>Aspect ratio (L/W ratio) (D)</p> Signup and view all the answers

What happens to the band gap of quantum dots as their size increases?

<p>It decreases. (A)</p> Signup and view all the answers

What type of light emission is observed when electrons in quantum dots return to the valence band?

<p>Radiative emission (C)</p> Signup and view all the answers

How does uneven excitation of free electrons in larger nanoparticles affect surface plasmon resonance?

<p>It causes a red-shift of the SPR. (C)</p> Signup and view all the answers

What is a liposome?

<p>A sealed compartment formed by phospholipid bilayers. (A)</p> Signup and view all the answers

Which of the following statements about localized surface plasmon resonance (LSPR) is correct?

<p>LSPR can be found in nanosized structures. (B)</p> Signup and view all the answers

What is the primary model currently used to describe mRNA-LNPs?

<p>Core-shell model (D)</p> Signup and view all the answers

As of 2023, what is projected to be the global market size for protein therapeutics?

<p>USD 605.38 Billion (D)</p> Signup and view all the answers

What mechanism allows semaglutide to enhance its absorption in the stomach?

<p>Increase in gastric pH via SNAC (C)</p> Signup and view all the answers

Which generation of therapeutic proteins is defined by modified structures to improve specificity and efficacy?

<p>Second generation (A)</p> Signup and view all the answers

Why must proteins typically be injected rather than taken orally?

<p>They rapidly degrade in the body (A)</p> Signup and view all the answers

What is a significant milestone in the treatment of type 2 diabetes as mentioned in the content?

<p>The first oral GLP-1 receptor agonist formulation (C)</p> Signup and view all the answers

Which type of nanocarrier is designed to respond to external stimuli such as light or temperature?

<p>Stimuli-responsive nanocarriers (C)</p> Signup and view all the answers

What is the purpose of PEGylation in therapeutic proteins?

<p>To improve therapeutic effectiveness (D)</p> Signup and view all the answers

What is the role of GLP-1 in the human body?

<p>Promoting satiety and reducing energy intake (B)</p> Signup and view all the answers

What does the Therapeutic Goods Act, 1989 aim to ensure?

<p>Quality, safety, efficacy, and timely availability of therapeutic goods (B)</p> Signup and view all the answers

Which type of medicines includes those that require a prescription?

<p>Prescription medicines (B)</p> Signup and view all the answers

What is the expected outcome of oral administration of semaglutide regarding hypoglycemia risk?

<p>Low risk for hypoglycemia (A)</p> Signup and view all the answers

Which development pathway is NOT typically part of medical devices?

<p>Gene therapy isolation (B)</p> Signup and view all the answers

What is the role of the protein capsid in viral vectors?

<p>To encapsulate the genetic payload and determine cell tropism (A)</p> Signup and view all the answers

Why are lentiviral and retroviral vectors particularly suited for dividing cells?

<p>They can effectively integrate into the cell genome (A)</p> Signup and view all the answers

What gene is targeted by the Luxturna therapy to restore vision?

<p>RPE65 gene (D)</p> Signup and view all the answers

What type of compound is Lipofectamine primarily composed of?

<p>Cationic lipids (B)</p> Signup and view all the answers

What is the primary function of small interfering RNA (siRNA)?

<p>To inhibit gene expression by targeting mRNA (C)</p> Signup and view all the answers

Which of the following statements about the RNA-induced silencing complex (RISC) is true?

<p>It contains proteins like AGO2 and Dicer (D)</p> Signup and view all the answers

What type of RNA molecules are primarily involved in RNA interference (RNAi)?

<p>MicroRNA (miRNA) and small interfering RNA (siRNA) (D)</p> Signup and view all the answers

Which factor is crucial for the success of siRNA therapy in vivo?

<p>Ability to resist degradation by nucleases (B)</p> Signup and view all the answers

Patisiran is primarily used to treat which condition?

<p>Hereditary transthyretin-mediated amyloidosis (C)</p> Signup and view all the answers

What cellular component is primarily targeted by the lipid nanoparticles used in siRNA delivery?

<p>Cell membranes (A)</p> Signup and view all the answers

Which of the following vaccines instructs cells to produce the SARS-CoV-2 spike protein?

<p>Comirnaty (D)</p> Signup and view all the answers

Which mechanism allows siRNA to guide the cleavage of target mRNA?

<p>Formation of the activated RNA-induced silencing complex (siRISC) (A)</p> Signup and view all the answers

Flashcards

S.aureus Protease Biosensor

A biosensor that uses magnetic nanoparticles conjugated to a peptide substrate to detect S.aureus protease activity.

ECL Detection

Measures the colour change in the biosensor that happens upon enzymatic cleavage, leading to the detection of a substrate.

Magnetic Nanoparticles

Small particles that are attracted to magnets, used to detect enzymatic reactions.

Aptamer-based Latent TB Infection Test

A test that uses aptamers to detect the presence of M. tuberculosis, utilizing a colour change for detection.

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Mannose-capped Lipoarabinomannan (ManLAM)

A glycolipid found in M. tuberculosis cell walls, recognized by specific aptamers for diagnosis.

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Colorimetric Detection

A method of detecting and quantifying a substance by measuring a colour change.

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Bacterial Surveillance Method Requirements

A surveillance method must be sensitive, specific, rapid, reliable, and cost-effective for bacterial detection.

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3,3′,5,5′-tetramethylbenzidine (TMB)

A colourless chemical that becomes coloured during oxidation, used in the quantification process of Aptamer-based Latent TB Infection Test.

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Aptamer

A molecule that specifically binds to a target, like ManLAM (a bacterial component).

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Nanoparticle

A tiny particle, measured in nanometers.

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Nanoscale

The realm of structures and properties at the nanometer scale.

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Surface Area to Volume Ratio

The ratio of surface area to volume of a structure, high at the nanoscale.

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Gold Nanoparticles

Nanoparticles made of gold, with properties different from bulk gold.

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Melting Point (Gold NPs)

Melting point of gold nanoparticles is affected by size.

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Localised Surface Plasmon Resonance

When light interacts with a metal nanoparticle, causing it to absorb light.

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Recombinant DNA Technology

A technique to create a copy of genes for vaccines or other products.

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Hepatitis B Vaccine

Vaccine produced by using recombinant DNA technology to produce the antigen.

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Lipid Nanoparticle-mRNA Formulations

Nanoparticles using lipids to deliver mRNA, a component of COVID-19 vaccines.

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Surface Plasmon Resonance (SPR)

The collective oscillation of conduction band electrons in resonance with incident light, producing plasmonic electrons through non-radiative excitation.

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Localized Surface Plasmon Resonance (LSPR)

Surface plasmon resonance occurring on nanosized structures.

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Gold Nanoparticles as Quenchers

Gold nanoparticles can diminish the intensity of light or other signals in SPR or LSPR systems.

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Size Dependence of SPR

The surface plasmon resonance of metal nanoparticles shifts to longer wavelengths (red-shifts) with increasing nanoparticle size.

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Quantum Dots (QDs)

Semiconductor nanostructures that confine conduction band electrons and valence band holes in all three spatial dimensions.

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QD Emission Colour

The emission colour of QDs changes from blue to green to red as their size increases.

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Liposomes

Sealed compartments spontaneously formed by phospholipid bilayers.

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Nanoparticle Aggregation

The clustering of nanoparticles, causing a red-shift in surface plasmon band.

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Quantum Size Effect (QSE)

Strong size-dependent energy band gap for QDs when their size is small compared to excitation Bohr radius.

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Nanorod SPR

Au nanorods exhibit both transverse and longitudinal SPRs, with the longitudinal peaks sensitive to aspect ratio (L/W).

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Protein capsid

The protein shell that encloses and protects the viral genome.

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Lentiviral vector

A type of viral vector that can integrate its genetic material into the host cell's genome.

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Retroviral vector

A type of viral vector that can integrate genetic material into the host cell's genome.

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Tissue/cell tropism

A virus's ability to infect certain types of cells or tissues.

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Restriction endonucleases

Enzymes that cut DNA at specific sequences.

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Polymerase Chain Reaction (PCR)

A method used to amplify specific DNA sequences.

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Gene therapy

A technique using genes to treat or prevent disease.

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Luxturna

First FDA-approved gene therapy for a genetic eye disease.

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Non-viral vectors

Gene delivery methods that do not use viruses.

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RNA interference (RNAi)

A biological process that silences specific genes by degrading their mRNA.

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siRNA

Small interfering RNA; a type of RNA molecule used to silence gene expression.

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RISC

RNA-induced silencing complex; a complex that degrades target mRNA molecules guided by siRNA.

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Lipid nanoparticles

Tiny particles made of lipids used to deliver drugs, including siRNA.

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Patisiran

First approved siRNA drug to treat a genetic disease.

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Synthetic mRNA

Man-made mRNA used for vaccines to trigger immune responses.

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Biological

A material derived from human cells or tissues, used to treat, prevent, diagnose, or modify physiological processes in humans.

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GMO

Genetically modified organism; an organism with altered genes.

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Class 1 Biological

Low-risk biological product needing no GMP (Good Manufacturing Practices), listed in the Therapeutic Goods Regulation.

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Application Process (biologicals)

Submit application, appropriate fees, potentially listing in Therapeutic Goods Schedule 16, GMP may not be needed.

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Gene Technology (GT) Act

National scheme for regulating GMOs and came into effect on 21 June 2001

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Class 2, 3, or 4 Biological

High-risk biological products needing GMP; different application processes.

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Therapeutic Goods Regulation

Regulation governing therapeutic goods in Australia, including biologicals.

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Faecal microbiota transplant (FMT)

A type of biological that is currently listed in the schedule as a class 1 biological needing no GMP, but not a generic biological, in the therapeutic goods regulation.

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mRNA-LNPs

Lipid nanoparticles used to deliver mRNA for vaccines and therapies.

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Core-Shell Model

Model describing mRNA-LNP structure with a core and surface layer.

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Exocytosis

Process of releasing molecules from a cell.

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First mRNA Vaccine

First mRNA-based vaccine authorized by the FDA.

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Protein Therapeutics

Drugs based on proteins and peptides.

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Protein Degradation

Process by which proteins break down.

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Oral Peptide Therapy

Delivering peptides through the mouth.

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GLP-1

30 amino acid peptide hormone promoting satiety.

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Semaglutide

GLP-1 receptor agonist, used to treat type 2 diabetes.

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Insulin

Peptide hormone regulating blood glucose.

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Therapeutic Goods

Products used to diagnose, treat, or prevent diseases.

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Regulatory Approval

Governmental approval for a product or therapy to enter the market.

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Stimuli-responsive Nanocarriers

Nanoparticles that release drugs based on specific cues.

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Nanotechnology-based delivery

Using nanotechnology to transport drugs and proteins.

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First Generation

Therapeutic proteins with native sequences.

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