This Catalyst article explains how scientists came to understand plants' sensitivity to external stimuli and their ability to move. Mimosa pudica...

A Catalyst article looking at the chemicals that are in plants and trees and the role they play in the life of the plant. Starting with photosynthesis the article moves onto naturally occurring chemicals and explains why plants need fertilisers. Growing salad crops hydroponically is also examined.

This...

These resources from the Wellcome Trust look at how populations grow, change and move, and why understanding them is so important. The resources use real research to illustrate many aspects of the study of populations, including:

• ecology
• epidemiology
• ...

A Catalyst article about predators. The article explores some general principles about predator–prey relationships and looks in some detail at the adaptations shown by a predatory insect being used in the control of an insect pest.

This article is from Catalyst: GCSE Science Review 2005, Volume 16, Issue 1...

A Catalyst article about the human gut and the many microbes it hosts, mainly bacteria. Probiotics are live bacterial ingredients or supplements designed to multiply in the colon and have an impact on health. A prebiotic is a carbohydrate that is not digestible by humans. The article examines the role they play,...

These resources explore proteins by their different function, with examples of how they give structure to living things, carry messages and molecules around our bodies, support the immune system, catalyse chemical reactions, and their use in industry and medicine:

Structure and movement How...

A Catalyst article which explores how the nervous system works. Sensitivity, the ability to respond to stimulation, is a product of nervous system activity. How nerve impulses pass around the body, and why these responses are so fast are investigated in the article. Neurones, reflexes, synapses and receptors are...

This Catalyst article looks at cuttlefish which have a remarkable ability to change their appearance at high speed. But how do they do this?

This article is from Catalyst: Secondary Science Review 2016, Volume 26, Issue 4.

Traditional cooking stoves burn fuel and produce a lot of smoke which is a major cause of pollution, leading to problems locally for the people using the stoves and also globally as a probable cause of retreating glaciers. According to the World Health Organisation, four million people worldwide die each year from...

This Catalyst article outlines volunteering opportunities for young scientists, engineers and medical students who put their studies to good use, working with local people around the world to bring the benefits of technology to communities who otherwise would go without some of the basic needs of life.

This...

This issue of the Big Picture, from the Wellcome Trust, looks inside the cells that make up every part of the human body. Focussing on animal cells, the articles are suitable for post-16 students or as an extension for 14-16 students. The topics covered include: * What are cells for? * What are the structures of...

Each individual blade of grass consists of various tissues, each made of cells in their thousands. In these cells an as yet unknown number of reactions and interactions are constantly taking place. The cells contain different parts known as organelles, which can be thought of as the cellular equivalent of the...

This Catalyst article describes how biophysics is helping in the search for novel antibiotics. Bacteria produce an array of proteins to kill off their competitors. These proteins, called bacteriocins, are very efficient at penetrating the defensive outer layers of bacteria cells by moving through specific membrane...

The human population of Earth has reached seven billion. This Catalyst article explores the impact that human activity may have on the planet. The article looks at the rate of population growth and how human impact is also related on the amount of resources used by an individual. It considers if the effects of...

Published by the Wellcome Trust, this issue explores the biological basis of sex differences and the relationship between sex and gender.

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