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A carrier is not open simultaneously to both the extracellular and intracellular environments. Either its inner gate is open, or outer gate is open. In contrast, a channel can be open to both environments at the same time, allowing the molecules to diffuse without interruption. Carriers have binding sites, but pores and channels do not.
Facilitated diffusion in cell membrane, showing ion channels and carrier proteins. Facilitated diffusion (also known as facilitated transport or passive-mediated transport) is the process of spontaneous passive transport (as opposed to active transport) of molecules or ions across a biological membrane via specific transmembrane integral proteins. [1]
Some of the key disciplines used in reservoir analysis are the fields of structural analysis, stratigraphy, sedimentology, and reservoir engineering. The seal, or cap rock, is a unit with low permeability that impedes the escape of hydrocarbons from the reservoir rock. Common seals include evaporites, chalks and shales. Analysis of seals ...
In interwell tests, the tracer is injected at one well along with the carrier fluid (water in a waterflood or gas in a gasflood) and detected at a producing well after some period of time, which can be anything from days to years. In single well tests, the tracer is injected into the formation from a well and then produced out the same well ...
The commensal species of Neisseria can act as a reservoir of genes that can be acquired; for example, this is how capsule switching can occur as a means of hiding from the immune system. [17] An invasive N. meningitidis strain of serogroup C broke out in Nigeria in 2013 – the strain was a new sequence type, ST-10217 determined by multilocus ...
A person was arrested after attempting to climb a temporary fence near the White House this morning, according to a U.S. Secret Service spokesperson. The Secret Service said the person was ...
Keira Knightley is reflecting on her younger years in the spotlight.. In an interview with The Times published on Saturday, Nov. 23, the Pride & Prejudice star, 39, opened up about what it was ...
Jayson Tatum had 28 points and 12 rebounds and the Boston Celtics cruised to a 112-98 victory over the Washington Wizards on Sunday night. Tatum had missed two of Boston's previous four games with ...