Navigation Links
Facilitated diffusion


Facilitated diffusion (facilitated transport) is a process of passive transport (diffusion) via which molecules diffuse across membranes, with the help of transport proteins (mediated transport).

Small uncharged molecules can easily diffuse across cell membranes. However, due to the hydrophobic nature of the lipids that make up cell membranes, water-soluble molecules and ions cannot do so; instead, they are helped across by transport proteins. The transport protein involved is intrinsic, that is, it completely spans the membrane. It also has a binding site for the specific molecule (e.g., glucose) or ion to be transported. After binding the molecule, the protein changes shape and carries the molecule across the membrane, where it is released. The protein then returns to its original shape, to wait for more molecules to transport.

In contrast to active transport, facilitated diffusion does not require energy and carries molecules or ions down a concentration gradient.


'"/>


(Date:3/24/2015)... ( http://www.researchandmarkets.com/research/kvdtcw/face_and_voice ) has announced the addition of the ... report to their offering. This report analyzes the worldwide ... following Segments: Face Biometrics, and Voice Biometrics. The report provides separate ... Japan , Europe , ... Africa , and Latin America . ...
(Date:3/23/2015)... YORK , March 23, 2015   HOYOS ... property management company, today announced that the Company will ... for both enterprise and consumers at Connect:ID on March ... HOYOS Labs will highlight the IEEE Biometric ... TM ; and enterprise access control system. BOPS ...
(Date:3/20/2015)... --Research and Markets ( http://www.researchandmarkets.com/research/rswjb4/hand_geometry ) has announced ... Business Report" report to their offering. This ... Thousands. The report provides separate comprehensive analytics for the US, ... Europe , Asia-Pacific , ... Annual estimates and forecasts are provided for the ...
Breaking Biology News(10 mins):Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 2Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 3Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 4Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 5Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 6HOYOS Labs to Showcase Host of Biometrics Technologies at Connect:ID in Washington, D.C. 2HOYOS Labs to Showcase Host of Biometrics Technologies at Connect:ID in Washington, D.C. 3Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 2Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 3Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 4
... presented Jim Gartland of the Virginia Institute of Marine ... for his outstanding contributions to the field of fisheries ... Atlantic coastal states in 1942 for the conservation and ... covers near-shore waters from Florida to Maine. ASMFC ...
... NYNovember 6, 2013: Decades worth of research shows that teathe ... illnesses, including heart disease, certain types of cancer and type ... help promote weight loss and maintain a healthy weight, improve ... attention, problem solving and mood. The December 2013 issue ...
... suggests that the brain plays a key role in glucose regulation ... Nov. 7 issue of the journal Nature . If the ... ways to prevent and treat this disease, which is projected to ... In the paper, lead author Dr. Michael W. Schwartz, director ...
Cached Biology News:ASMFC honors Gartland with Annual Award of Excellence 2ASMFC honors Gartland with Annual Award of Excellence 3New research shows tea may help promote weight loss, improve heart health and slow progression of prostate cancer 2New research shows tea may help promote weight loss, improve heart health and slow progression of prostate cancer 3New research shows tea may help promote weight loss, improve heart health and slow progression of prostate cancer 4New research shows tea may help promote weight loss, improve heart health and slow progression of prostate cancer 5Brain may play key role in blood sugar metabolism and development of diabetes 2
Other biology definitionOther Tags