Creative Commons licences

The Wellcome Foundation has a collection of images that can be used in teaching under a Creative Commons licence. The collection includes drawings of Lavoisier at work and of Priesdey s chemical apparatus. 

Fig. 6 Schematic design for a sensor for attomolar concentrations of specific DNA strands from work by N. Kotov et al7° Reproduced from Kotov et al under a creative commons attribution 3.0 unported licence.

Fig. 16 Schematic representation of the formation of CSFs. (A) The surface of the substrate is treated to create abundant silanol groups, which can be rationally controlled with the pretreatment method. (B) The quaternary ammonium groups are chemically modified on the substrate surface by co-condensation between the silanol and siloxane of TMAPS. (C) Parallel-aligned DNA molecules are arranged on the surface by electrostatic interaction between the quaternary ammonium groups of the substrate and the phosphate groups of DNA. (D) The formation of CDSFs is due to chiral DNA packing, and the CDSFs are subsequently arranged on the surface of the substrate by the self-assembly of DNA, TMAPS and TEOS in the presence of Mg. (E) The pure CSEs are obtained by calcination to remove the DNA. Reproduced from Che etal. under a creative commons attribution 3.0 unported licence.

Fig. 17 Macroscopic helical morphologies of CDSFs. Top view and side view of the low-and high-magnification SEM images of CDSEs formed on the silicon substrates without pretreatment (al-4) and with H2SO4/H2O2 pretreatment (bl-4) showing the impeller-like helical architecture composed of several blades grown on the substrate. The molar composition of the synthesis gel was DNA (phosphate group). Reproduced from Che et a/. under a creative commons attribution 3.0 unported licence.

Copyright in this article, its metadata, and any supplementary data is held by its author or authors. It is published under the Creative Commons Attribution By licence. For further information go to http //creativecommons.org/licenses/ by/3.0/. 

Fig. 3.12 The albedo for different substances. The higher the albedo, the larger the fraction of diffusely reflected sunlight. The range of the albedo is from 0 completely dark) to 1 bright). On Earth this effect is very well known If a snow covered area warms and the snow melts, the albedo decreases, more sunlight is absorbed, and the temperature tends to increase. If snow forms, a coohng cycle happens. Credit H. Grohe, Creative Commons BY-SA licence...

---