Sintaxis Grafica de la Multimedia (Graphical Syntax of Multimedia)
The multimedia offers an integration that must be made by the subject with the stimuli given, in their majority visual. For that reason it is interesting to know how effective may be the use of images and to propose some basic norms for designing multimedia software based on a graphic syntax
SEM image of open cell polyurethane foam
If a gas is injected into a liquid it forms a cellular foam structure. When a thermoset prepolymer of low viscosity is foamed, the polymer can drain from the cell walls (driven by surface tension) before it sets at the cell edges, leaving an open-celled foam. The cell edges have three concave sides, giving rise to the tri-cuspid cross section visible at the bottom of this image. The average co-ordination number for the nodes (where struts meet) is four, giving tetrahedral junctions.
Fe, C 1.0 (wt%), hypereutectoid alloy
This secondary electron SEM image shows the cementite delineating prior austenite grain boundaries with a thin layer. The amount of proeutectoid phase is very low, with the majority of the area being taken by the pearlite eutectoid. Again each pearlite cell has a different orientation with the ferrite phase being selectively etched.
Animal marks and trails
Items in nature, such as twigs and leaves, can show bite and chew marks where animals have been eating off of plants. Animals make trails by traveling over the same area several times to get to a destination.
This red algal cell (Chlamydomonas nivalis) gives mountain snow packs a red tint. It uses the pollutants in snow as food. It cannot be seen without a microscope.
Acid in water
Plants and animals that live in water create some amount of acid in the water. The carbon dioxide that plants and animals release into the water makes the water acidic and unsafe for living organisms. This is why the water of captive aquatic animals and plants must be changed often.
Abundant green plants on the forest floor
Green plants make their own food by a process called photosynthesis. They also use nutrients and water from the soil to grow. Primary consumers (insects, chipmunks, mice and deer) eat green plants.
A rhinoceros is an example of an herbivore. Herbivores are animals that mostly eat producers, or plants.
A field of soil
Soil is an example of a non-living thing. Soil contains nutrients and living organisms, but the soil itself is not alive. Soil is important in plant growth because soil gives plants a place to anchor their roots and it also provides the plant with essential nutrients.
A fern plant in forest habitat
Ferns and horsetails are well-known seedless vascular plants. Different from mosses, ferns have branched spore producing structures which allows for the plant to produce many spores. The spots on the leaves of the fern contain the spores.
A dam in the middle of a river
Dams have negative impacts on the plants and animals that have adapted to the specific movement of natural rivers and streams. Dams also cause temperature changes, erosion, and movement of sediment that are deadly to many organisms.
A collection of fern plants in a California forest
Ferns are the most diverse group of seedless vascular plants. The leaves are compound and contain many little leaflets. The many leaflets contain spore spots. Ferns have a true root system, unlike the bryophytes.
A Manual of Online Molecular Biology Techniques
This is a collection of tried-and-true technique descriptions used in teaching postgraduate students in the Department of Molecular & Cell Biology at UCT.
What is the genome made of?
Genomes are composed of DNA, and a knowledge of the structure of DNA is essential to understand how it can function as hereditary material. DNA is remarkable, breathtakingly simple in its structure yet capable of directing all the living processes in a cell, the production of new cells and the development of a fertilized egg to an individual adult. DNA has three key properties: it is relatively stable; its structure suggests an obvious way in which the molecule can be duplicated, or replicated;
The Thin Blue Line-Forensic Scientists
This site draws on, and brings together, many scientific disciplines-identification of hairs and fibers, forensic psychology,DNA testing, photography, bloodstain pattern analysis, and computer forensics-that contribute to the integrated analysis of a crime and the physical evidence left at a crime scene.
Bio-engineered Animals and Models of Human Disease
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One Year After the Garnaut Climate Change Review
Professor Ross Garnaut presented the final report of the Garnaut Climate Change Review to Prime Minister Kevin Rudd on 30 September 2008, the morning of the largest ever one day points fall on the New York Stock Exchange. Since then, the histories of the financial crisis and climate change policy have been closely linked. Amongst much else, they have been linked by the challenge that Governments have faced, in Australia, in the United States and elsewhere, in formulating policy in the national i
Powering the Planet: The Challenge for Science in the 21st Century
The supply of secure, clean, sustainable energy is arguably the most important scientific and technical challenge facing humanity in the 21st century. Rising living standards of a growing world population will cause global energy consumption to increase dramatically over the next half century. Within our lifetimes, energy consumption will increase at least two-fold. This additional energy needed is not attainable from long discussed sources, the global appetite for energy is simply too much. Pet
Do Garnaut’s targets add up?
On Friday, 5 September 2008, Professor Ross Garnaut released his much awaited supplementary draft report on targets and trajectories. The report argues that Australia's mid- and long-term targets should be to reduce emissions net of international trading by 10 per cent from 2000 levels by 2020, and 80 per cent by m2050. This, we are told, is a proportionate contribution to the ‘achievable' international goal of stabilising the atmospheric concentration of greenhouse gases at 550 parts per
Unravelling the mysteries of chromsomes
The DNA in our cells is tightly packed into structures called chromosomes. The role of the physical structure of chromosomes in diseases and genetics is being explored thanks to recent advances in technology that allow scientists to look at how the DNA is packaged into chromatin- the structures that form chromosomes. In this lecture Dr Grigoryev will discuss current models of chromosome organisation, several examples of cutting edge research aimed at understanding role of chromatin in cell diffe