sábado, 30 de julio de 2016

Genetic diversity,


Genetic diversity and the r/K gradient in animals.
The average per-day fecundity is on the x axis and the average size of eggs or juveniles is on the y axis; each dot is for a family (one to four species each). The colour scale indicates the average...
Genetic diversity and the r/K gradient in animals.
The average per-day fecundity is on the x axis and the average size of eggs or juveniles is on the y axis; each dot is for a family (one to four species each). The colour scale indicates the average nucleotide diversity at synonymous positions, expressed in per cent. The negative correlation reflects a trade-off between quantity and size of offspring. r-strategists (bottom right; for example, blue mussels, heart urchins and lumbricid earthworms) are more polymorphic than K-strategists (top-left; for example, penguins, Galapagos tortoises and subterranean termites).
from the article “Determinants of genetic diversity” by NATURE REVIEWS GENETICS.

jueves, 21 de julio de 2016

lunes, 18 de julio de 2016

Graphic Biology

Sometimes figures created by scientists are striking, some others are just ugly and misleading the message. Wrong fonts, unfitting alignment of elements, excessive use of colors, dense strokes and unnecessary repetition of information, are among the issues that scientific figures can present. As a learning process, Graphic Biology will show technical images/illustrations that are accurate, self-explanatory and clear from scientific results and conclusions.Graphic Biology will try to expose the best visual examples of scientific communication from now and from the past. Tips from graphic design, cognitive psychology and semiotics will be also part of the journey. The encounter between science and art will be celebrated.
Enjoy the ride!

viernes, 15 de julio de 2016

Emil Erlenmeyer and the Erlenmeyer Flask

Whether you know it as an Erlenmeyer flask, conical flask, or by some other name, it’s a piece of glassware most of us, chemists or not, have likely used at some point. The Erlenmeyer flask is the most stereotypical piece of chemistry glassware there is, and today marks its creator’s birthday. Emil Erlenmeyer was born on 28 June in 1825; here we take a look at his eponymous flask, as well as some of his other achievements.
Firstly, to give Erlenmeyer his full name: Richard August Carl Emil Erlenmeyer. Perhaps not surprising that he chose to shorten it! He was a German chemist who originally specialised in pharmacy, but eventually gravitated back toward chemistry. During his career, he synthesised or isolated numerous organic compounds for the first time, and also made some significant contributions to our understanding of the structure of organic molecules.
Despite this, the flask that bears his name is what Erlenmeyer is invariably remembered for, though in some countries it’s known by other names. In the UK, hearing it referred to as a conical flask is more common, whereas in Italy they sometimes call it a ‘beuta’. Erlenmeyer designed his flask in the late 1850s; he first described it in a paper published at the beginning of 1860, by which point he had already arranged its commercial production and sale.