LD-50 Lab Introduction

LD-50 Lab Introduction earthref.org Scripps Classroom Connection

“Everything is poisonous yet nothing is poisonous.”Paracelsus earthref.org Scripps Classroom Connection

Max Benefit Beneficial Increasing Amount Harmful Everything can be beneficial up to a certain point, and then might be harmful. • earthref.org Scripps Classroom Connection

Example: Watching TV Max Benefit Beneficial 0.5 1 2 3 4 5 6 7 Increasing Hours Harmful • earthref.org Scripps Classroom Connection

Dose Response Curves • How can you decide what is the optimal dose? A harmful dose? • Important dose “indicator” • LD50-lethal dose, where 50% of the population dies • earthref.org Scripps Classroom Connection

A Closer Look: LD 50 Examples Toxic Substance A 100 100 Toxic Substance B 50 50 % Showing A Response 0 0 Dose of toxicant • earthref.org Scripps Classroom Connection

Threshold Effects Threshold:no effects are seen to occur in response to the dose 100 Which substance, A or B has a higher threshold for toxicity? A B 50 Response % 0 • earthref.org Scripps Classroom Connection

Risk Assessments • Determining potential adverse environmental health effects on people exposed to pollutants • LD50 and threshold effects • Includes many steps and processing • Eventually incorporated into regulations • earthref.org Scripps Classroom Connection

LD-50 Lab Introduction

LD-50 Lab Introduction

Presentation Transcript

J-50 Lab 1

Facts: LD

LD 50/30

ITS LAB Introduction

Group Lab Assignment (50 Points)

Lab 1 Introduction

J-50 lab 4

OpenMP Lab Introduction

Circuits Lab Introduction

Lab 5 Introduction

Lab 1: Introduction

Advanced Lab introduction

Lab 8 Introduction

LD 50 determination of Procaine

Lab 1: Introduction

“Lab Session Introduction”

Lab 3 Introduction

Lab Introduction

PHYSICS 50: Introduction

Lab 3 Introduction