Polymers: A Comprehensive Guide to Types, Properties, and Applications
Elastomers
Polymers are able to develop a large elastic deformation if they are subject to relatively small efforts. Some elastomers have extensions of 500% or more and return to their original shape. Elastomers consist of long chain molecules cross-linked. They have elastic properties due to two characteristics: 1) the long molecules are folded tightly when not stretched, and 2) the degree of crosslinking is well below the ternofijos.
Production Technology
Synthetic elastomers are obtained by polymerization
Read MoreDisinfection Methods: Chemical, Physical, and Biological Approaches
Disinfection Methods
1. Chemical Processes: These are used for disinfection and can act in two ways:
Microbiostatic Action: Impedes the growth and proliferation of microorganisms.
Microbicidal Action: Destroys microorganisms in the environment, killing them.
These compounds can act as disinfectants or antiseptics.
– Antiseptics: Chemicals that kill pathogenic microbes, but not all, and can be tolerated on the surface of living organisms. Examples include ethyl alcohol, hydrogen peroxide, iodine solutions,
Theories of Evolution: From Creationism to Punctuated Equilibrium
Species
A species is a group of individuals that can reproduce with each other and produce fertile offspring. There are two main explanations for the origin of species: direct creation and biological evolution.
Creationism
Creationism posits that each species was created by a specific creative act.
Fijismo
Fijismo argued that species remain unchanged over time.
Cuvier and Catastrophism
Georges Cuvier, a supporter of the immutability of species, proposed the theory of catastrophism. Catastrophism suggests
Read MoreImmunity, Vaccines, and Infectious Diseases
1. The term immunity is derived from the Latin open pal immune, it means to be free of charge, or be invulnerable to a particular infectious disease.
Immunity can be of two types: congenital or acquired.
Congenital or natural immunity, is one that is inherited, which develops the body itself at the individual level, racial or specific and is determined by the specific characteristics of the individual’s constitution, race or species.
Acquired immunity is acquired during life and can be further:
The Challenge of Living Longer and Healthier: A Comprehensive Guide
HEALTH: THE CHALLENGE OF LIVING MORE AND BETTER
You will have a world without hunger, without illness, without cancer or pain. You just need to want it. – György Albert Szent
Outline of Unit
- What is Health?
- Healthy Habits
- Disease: Types of Diseases
- Treatment of Diseases
- Medical Research Patents
- Medicine in Different Countries
WHAT IS HEALTH?
According to the World Health Organization (WHO), health is a state of complete physical, mental, and social well-being, not merely the absence of disease. Health is
Read MorePhonetics and Phonology: An Introduction to Speech Sounds
Phonetics: The Study of Speech Sounds
Phonetics studies the sounds of human speech. It is an empirical science based on the observation of facts. It tells us how sounds are produced and furnishes us with methods for their classification. Phonetics is not considered to be part of linguistics. It is divided into three branches:
- Articulatory Phonetics: Studies the articulation of sounds.
- Acoustic Phonetics: Studies the physical properties of speech sounds during the transmission of sounds from speaker