Cellulose acetate (CA) membranes have a very low binding affinity for most macromolecules and are especially recommended for applications requiring low protein binding, such as filtering culture media containing sera. However, both cellulose acetate and cellulose nitrate membranes are naturally hydrophobic and have small amounts (less than 1%) of non-toxic wetting agents added during manufacture to ensure proper wetting of the membrane. If desired, these agents can be easily removed prior to use by filtering a small amount of warm purified water through the membrane or filter unit. Surfactant-free cellulose acetate membranes with very low levels of extractables are available on some Corning® syringe filters.
Although some hackers may be unwilling to become entangled in politics, Moss sees the intense post-election interest in his community as an opportunity. “Part of it is dark because the average consumer is starting to know enough to worry about their refrigerator spying on them, where before that was an abstract. It might’ve been happening but it wasn’t on their radar. Now they will start questioning, ‘Why is my Nest tracking when I’m home and when I’m not? Now Alexa can get my questions subpoenaed by police, do I not speak out loud at home?’ The optimist in me says, now people know to ask those questions,” he said.
A new study published on July 20 in Current Biology suggests that elephant seals are able to recognize the tone and rhythmic patterns of their rivals’ calls. Just as it is with people who squabble online, maintaining dominance is very important to elephant seals’ social order. A team of researchers spent weeks studying an elephant seal colony in Año Nuevo State Park, California, where they were able to identify the alpha male and record his call. The team changed the rhythm and timbre of the call, and presented two modified versions back to the seal colony, in addition to the original.