concentration gradient

Listing 1 - 10 from 13 for concentration gradient

Membrane Transport Mechanisms
... pass directly through the membrane. Diffusion is always down a concentration gradient. This limits the maximum possible concentration of the molecule inside the cell (or outside ... gradient across the cell membrane, and then utilizing that gradient to transport a molecule of interest up its concentration gradient. An example of this mechanism is as follows: E. coli establishes a proton (H+) gradient ...
web.mit.edu

Cell Biology Problems
... ++, are efficiently removed from many living cells, even though this involves moving Ca++ up its concentration gradient. Propose a mechanism to achieve this. In your studies of some cells, you discover a ...
web.mit.edu More from this site

Botany online: Membranes and Transport
... composition, their pH value and their electric potential. Both the pH and the electric gradient can be measured. Some ions or small molecules (substrates) can be transported through the ... transport in contrast to passive transport that occurs only in the direction of the concentration gradient. Due to different compositions have the single membrane types different functions, too. Highly specialized ...
www.biologie.uni-hamburg.de

Recent Studies Upon Paphiopedilum Cultivation - Orchid Board
... are not only permeable to small ions, but have active (ATP driven) and passive (concentration gradient/charge gradient) transport channels for specific ions. Also, "artificial" fertilizers all contain naturally-occuring ... or worse than non-synthetic fertilizers, if used correctly. Problem with synthetics is concentration, you can burn roots and beneficial microbes easily. Organic (I hate that word, ...
www.orchidboard.com

CSIRO PUBLISHING - Functional Plant Biology
... KB) - $25.00 Research note: Low-boron acclimation induces uptake of boric acid against a concentration gradient in root cells of Olea europaea Sotiria Stavrianakou, Georgios Liakopoulos, Evangelos Karvonis, Evangelia Resta and ...
www.publish.csiro.au

The Succulent Plant Page: Glossary of Botanical Terms
... not green. Chemotropism - bending, growth or movement of a part under the influence of a concentration gradient of chemical substances. Aerotropism- special case of a response to oxygen. See also: Tropism. Chimera ...
www.succulent-plant.com

Molecule Illustrations
... diffusion in which no ATP is required. The ions may also move against a diffusion gradient in a process known as active transport. Unlike facilitated diffusion, active transport requires ATP. ... from a region of high concentration (inside cell) to a region of lower concentration (outside cell). Inside the cell the solution is hypotonic with a low solute (salt) concentration. Outside the membrane the ...
waynesword.palomar.edu

Botany online: Physical Chemistry - Mechanisms of Enzyme Catalysis
... + P > ES : k4 At a constant enzyme concentration, the turn-over velocity (v) of an enzyme increases as a function of the substrate concentration. It finally approaches saturation by way of an ... gradient of kM / vmax 1 / kM und 1 / vmax are the points of intersection with the co-ordinates. The dependency of the velocity of an enzymatically catalyzed reaction on the substrate concentration ...
www.biologie.uni-hamburg.de

ISSR Protocols
... soak Miscellaneous notes We usually run our reactions with a 20 to 50 µM primer concentration. I purchase my primers through Genosys (usually about $12 per primer with our institutional discount ... you may have to play with conditions for your DNAs. We usually run a temperature gradient with each new primer and then adjust [Taq] and [MgCl2] for the next rounds of ...
www.biosci.ohio-state.edu

Collar Rot in Tobacco Greenhouses
... most spores travel less than 100 yards from their source of origin. This steep dispersal gradient increases the possibility of finding and eliminating sources of primary inoculum of the pathogen. The ... 45 and 52-days are the most susceptible to collar rot. Leaf extract and inoculum concentration. High numbers of spores and the presence of a food supply on the leaf surface ...
www.ces.ncsu.edu

These listings are filtered
View all for concentration gradient