Tag Archives: Science

340 Years of Royal Society Journals Online

The complete archive (from 1665) of the Royal Society journals, is freely available electronically for two months. You can try using the Journal archive – it sure does have spectacular content, if only you can unearth it:

The archive contains seminal research papers including accounts of Michael Faraday’s groundbreaking series of electrical experiments, Isaac Newton’s invention of the reflecting telescope, and the first research paper published by Stephen Hawking.

Note to anyone with scientific content of high value that decides to allow internet access. Please contact Google and have them help you make it available online. They don’t have any official program to do so, but for collections of enough merit I can’t imagine you would have any trouble getting some Google engineer to take on the project.
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Spider Thread

Spider hanging by its thread

Why a spider hanging from a thread does not rotate

The extraordinary properties of spider’s thread are like a blessing for researchers working on polymers. However, the amazing twisting properties it displays are still not very well understood. How can one explain the fact that a spider suspended by a thread remains completely motionless, instead of rotating like a climber does at the end of a rope?
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Spider’s thread, on the other hand, is very efficient at absorbing oscillations, regardless of air resistance, and retains its twisting properties during the experiments. It also returns to its exact original shape. Certain alloys, such as Nitinol, possess similar properties but must be heated to 90° to return to their original shape.

The amazing properties of spider’s thread have been known for several years: its ductility, strength and hardness surpass those of the most complex synthetics fibers

See more blog posts on life science, biology, etc. and more posts of interest to students and everyone interesting in learning about science.

Arctic Seed Vault

Work begins on Arctic seed vault:

More than 100 countries have backed the vault, which will store seeds, packaged in foil, at sub-zero temperatures.
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The vault’s purpose is to ensure survival of crop diversity in the event of plant epidemics, nuclear war, natural disasters or climate change; and to offer the world a chance to restart growth of food crops that may have been wiped out.

At temperatures of minus 18C (minus 0.4F), the seeds could last hundreds, even thousands, of years. Even if all cooling systems failed, explained Mr Riis-Johansen, the temperature in the frozen mountain would never rise above freezing due to the permafrost on the mountainside.

Science for Kids

‘Sciencing’ with kids by Prakash Rao:

Let us understand well that science is better learnt through activities, experiences, experiments and projects.

Children’s experiences need to be real, concrete and [tangible]. We should never get carried away by just contents and facts. Link experiences to children’s life. Then they will feel a desire to know.

Children are naturally inquisitive. Mainly we need to provide opportunities for them to do what they would do naturally. In previous posts we have highlighted many ways to give kids the chance to learn and figure out how things work.

Self-Assembling Cubes Could Deliver Medicine

Nanocubes photos

Tiny Self-Assembling Cubes Could Carry Medicine, Cell Therapy – News Release from Johns Hopkins (pdf format)

Details of photos: “Scanning electron microscopy images of image of (A) a hollow, open surfaced, biocontainer, and (B) a device loaded with glass microbeads. (C) Fluorescence microscopy images of a biocontainer loaded with cell-ECM-agarose with the cell viability stain, Calcein-AM. (D) Release of viable cells from the biocontainer.”

Johns Hopkins researchers have devised a self- assembling cube-shaped perforated container, no larger than a dust speck, that could serve as a delivery system for medications and cell therapy.

When the process is completed, they form a perforated cube. When the solution is cooled, the solder hardens again, and the containers remain in their box-like shape.

“To make sure it folds itself exactly into a cube, we have to engineer the hinges very precisely,” Gracias said. “The self-assembly technique allows us to make a large number of these microcontainers at the same time and at a relatively low cost.”

Gracias and his colleagues used micropipettes to insert into the cubes a suspension containing microbeads that are commonly used in cell therapy. The lab team showed that these beads could be released from the cubes through agitation. The researchers also inserted human cells, similar to the type used in medical therapy, into the cubes. A positive stain test showed that these cells remained alive in the microcontainers and could easily be released.

And they are “always on the lookout for exceptional and highly creative undergraduate, graduate students and post-doctoral candidates” – maybe you.