Methylphenidate Decreased the Amount of Glucose Needed by the Brain to Perform a Cognitive Task

submitted by: noravolkow
The use of stimulants (methylphenidate and amphetamine) as cognitive enhancers by the general public is increasing and is controversial. It is still unclear how they work or why they improve performance in some individuals but impair it in others. To test the hypothesis that stimulants enhance signal to noise ratio of neuronal activity and thereby reduce cerebral activity by increasing efficiency, we measured the effects of methylphenidate on brain glucose utilization in healthy adults. We...
Authors: Nora d. Volkow, Joanna s. Fowler, Gene-jack Wang, Frank Telang, Jean Logan, Christopher Wong, Jim Ma, Kith Pradhan, Helene Benveniste, James m. Swanson

Saving the Tijuana Estuary

submitted by: ucsandiego

The estuary stands as the last barrier between the Pacific Ocean and pollution. Its mix of plants and silt acts as a filter that purifies inland rain and flood waters before they reach the ocean. The beaches of Imperial Beach are closed about 180 days every year. Without the estuary, they would be closed year round.

Tumour cords' growth in a vascular network

submitted by: sast
Evolutions of oxygen concentration and formation of hypoxic zones during tumour growth in the vascular network . This simulation was produced with an experimental modification to the model, where vessels are oxygen sources inside the simulation domain, cells do not switch to anaerobic metabolism in this simulation. For more information refer to .

ATP deficit in oxygen-limited tumour cord growth (FF++)

submitted by: sast
This is a simulation of tumour cord growth , where cells suffer from hypoxia (energy deficit shown with colour). The tumour grows along the blood vessel (coincides with x -axis). Red line shows the position of the tumour–host interface. This particular simulation was programmed in FreeFEM++ out of curiousity. The source code for simulation may be found at . This video reflects work in progress and may be different from the final results .

Spiranthes praecox Rich.

submitted by: Timothy M. Jones
Spiranthes praecox, greenvein lady's tresses, is an orchid native to eastern North America, from eastern Texas to New Jersey. Though many members of the genus are difficult to identify, this species is readily distinguished by the green veins on the lip of the flower. A yellow veined form is also known (C.J. Sheviak and P.M. Brown. In: Flora of North America. Vol 26, 2002). Plant 15-80 cm tall; with mostly linear leaves (1 - 5 mm wide) often hidden in leaf litter; inflorescence...

open genius: strumento per una scienza libera

submitted by: atnp lab

In this presentation, Andrea Gaggioli describes crowd-funding as a possible strategy to cope with the lack of investments in research, as well as to increase democratization in the sciences. Projects seeking funding could be stored in an online repository. Each project would include a description of its objectives, duration, and requested contribution. Investors (either people or funding agencies) could decide which projects to fund.