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concentration in this tissue. However, we can measure drug concentration in the blood or plasma, urine, saliva, and other easily sampled fluids (Figure 1-1). Kinetic homogeneity describes the predictable relationship between plasma drug concentration and concentration at the receptor site where a given drug produces its thera-peutic effect ...
This scenario is believed to explain the intracellular accumulation of azithromycin, the concentration of which can be 100-fold greater within the lysosome than within plasma. Ion trapping is also believed to explain the accumulation of drugs that are weak bases in prostatic fluid, which has a lower pH (pH 6.3) than plasma (pH 7.4).
Diffusion refers to the process in which particles from a higher concentration tend to move or transport to a lower concentration medium in order to attain the equilibrium. In diffusion, the concentration is equalized throughout the medium. Now we will try to understand this process of diffusion with the help of a diagram given below
Plug your values into the formula C 1 V 1 = C 2 V 2. In this formula, C 1 is the concentration of the starting solution, V 1 is the volume of the starting solution, C 2 is the concentration of the final solution, and V 2 is the volume of the final solution. Plugging your known values into this equation will allow you to find the unknown value with minimum difficulty.
The concentration ratio is calculated as the sum of the market share percentage held by the largest specified number of firms in an industry. The concentration ratio ranges from 0% to , and an ...
Define concentration. concentration synonyms, concentration pronunciation, concentration translation, English dictionary definition of concentration. n. 1. a. The act or process of concentrating, especially the fixing of close, undivided attention. b. The condition of being concentrated. 2.
Froth flotation is an important concentration process. This process can be used to separate any two different particles and operated by the surface chemistry of the particles. In flotation, bubbles are introduced into a pulp and the bubbles rise through the pulp. In the process, hydrophobic particles become bound to the surface of the bubbles.
Concentration polarization is a phenomenon that negatively effects the overall process efficiency of membrane-based processes. Generally, rejected solutes may accumulate on the membrane surface and their concentration will gradually increase. A concentration build-up occurs on the bulk side.
The ability to selectively process information (attention) and to retain information in an accessible state (working memory) are critical aspects of our cognitive capacities. While there has been much work devoted to understanding attention and working memory, the nature of the relationship between these constructs is not well understood.
From Hess's law we know that we can add the energies of each step in the cycle to determine the energy of the overall process. Therefore, the energy of solution formation, the enthalpy of solution, equals the sum of the three steps: D H soln = D H 1 + D H 2 + D H 3. The breaking of bonds requires or absorbs energy. This process is endothermic.
The concentration of ore can is the chemical process of eliminating impurities like sand, rocks, silt, grit etc. from the ore for the extraction of metal. In this content definition and methods for concentrating ore are explained along with the definition of ore and its types.
Osmosis relates to solute concentration in that when solute concentration is lower, the concentration of solvent is higher, and when the solute concentration is higher, the concentration of solvent is lower.. So, we could also say that osmosis is the net movement of a solvent across a semi-permeable membrane from an area of low solute concentration to an area of greater solute concentration.
The self-concentration process developed by 3H Company is the other liquid-liquid phase-change absorption process. In this process, the nonaqueous solvent contains an amine dissolved in alcohol that absorbs carbon dioxide at mild conditions. The absorption of CO 2 results in the formation of two liquid phases: one is CO 2 -rich phase (lower ...
Stress concentration is the accumulation of stress in a body due to sudden change in its geometry. When there is a sudden change in the geometry of the body due to cracks, sharp corners, holes and decrease in the cross section area, then there is an increase in the localised stress near these cracks, sharp corners, holes, and decreased cross section area.
Similarly, energy stored in chemical concentration gradients or electric potential gradients is used to synthesize chemical bonds, or to transport other molecules "uphill" against a concentration gradient. This latter process occurs during the transport of nutrients such as glucose into certain cells and transport of many waste products out ...
Molecules diffuse from areas of high concentration, to areas of low concentration, down a concentration gradient. The concentration gradient therefore represents the concept that, just as a ball rolls down a slope, during diffusion molecules move down the concentration gradient. Higher concentration gradients will result in higher rates of diffusion.
Gangue also means impurities. Note: Remember that the process of froth flotation is mainly used for sulphide ores of copper, lead and zinc. Apart from these it can also be used for the concentration of Cinnabar ( HgS ) the ore of mercury.
The concentration camps, standing outside the reach of the German justice authorities, had always been places where the SS could kill prisoners. After the beginning of the war, however, the camps increasingly became sites for the systematic murder of individuals or small groups of persons. ... Explain the systematic nature of the attempt to ...
hemihydrate process that produces calcium sulfate with a half molecule of water (CaSO4 ½H2O). This one-step hemihydrate process has the advantage of producing wet process phosphoric acid with a higher P2O5 concentration and less impurities than the dihydrate process. Due to these advantages,
The concentration process is based on a pressure gradient over a membrane, which rejects the analyte molecules. High molecular weight substances are already rejected by ultrafiltration membranes. But the typical application of reverse osmosis is the separation of low molecular weight substances from aqueous solutions to purify the water or to ...
The flotation process for the concentration of ores is a method by means of which one or more of the minerals in the ore (usually the valuable ones) are picked up by means of a liquid film and floated at the surface of a mass of fluid pulp. Here they are separated from the other minerals, which remain immersed in the body of the pulp. In general, the minerals which are floated are sulphides of ...
Diffusion is the process of movement of molecules under a concentration gradient. It is an important process occurring in all living beings. Diffusion helps in the movement of substances in and out of the cells. The molecules move from a region of higher concentration to a region of lower concentration until the concentration becomes equal ...
The reverse Haber process is an example of a zero-order reaction because its rate is independent of the concentration of ammonia. As always, it should be noted that the order of this reaction, like the order for all chemical reactions, cannot be deduced from …
Polymerase Chain Reaction, 12/2004 5 MgCl 2 The concentration of MgCl 2 influences the stringency of the interaction between the primers and the template DNA. The range of MgCl 2 usually tested is from 0.5 - 4 mM in 0.5 mM increments, while the default starting point is often is 1.5 mM.
A concentration camp had been established at Majdanek in 1941. In the spring of 1942, following the Wannsee Conference, the camp was adapted to become an extermination camp by the addition of gas chambers and crematoria. Auschwitz-Birkenau was a complex, consisting of a concentration camp, a forced labour camp and an extermination camp.
3. Set aside specific times during the day in order to let your mind wander or your concentration drift. If you have a set time during the day — say your "drift off" time is at 5:30 every day, when you get back from school or work — you may be less likely to sanction drifting off during 11 a.m. or 3 …
concentration gradient of glucose will be kept high, and there will a steady one-way traffic. Osmosis Osmosis is a special example of diffusion. It is the diffusion of water through a partially permeable membrane from a more dilute solution to a more concentrated solution – down the
What Is Concentration – Definition. Concentration is the ability to direct one's attention in accordance with one's will. It means control of the attention. It is the ability to focus the mind on one subject, object or thought without being distracted. It is the ability to focus the attention, and at the same time, ignore other unrelated ...
A 2007 study from Stanford University published in the journal Neuron found that music engages the areas of the brain linked with paying attention, making …
Concentration definition is - the act or process of concentrating : the state of being concentrated; especially : direction of attention to a single object. How to use concentration in a sentence.
Explain why and how passive transport occurs; ... In passive transport, substances move from an area of higher concentration to an area of lower concentration in a process called diffusion. A physical space in which there is a different concentration of a single substance is said to have a concentration …
The linear relationship between absorbance and concentration displays that absorbance depends on the concentration. Beer's Law, A=Ebc, helped to develop the linear equation, since absorbance was equal to y, Eb was equal to m, and the concentration, c, was equal to the slope, x, in the equation y=mx+b. To calibrate the spectrometer, a solution ...
Prior to breakthrough, the concentration of adsorbate in the effluent is nearly zero, then it increases as the mass-transfer zone exits the end of the column. Ultimately, the trailing edge of the mass-transfer front reaches the end of the bed, and the effluent concentration increases to the feed value (i.e., c/c 0 = 1).
Risk assessment is the process of gathering all available information on the ... the concentration of a substance at the point of exposure. Modeling is mostly used when determining concentrations of substances in air, but can be used to determine the amount in lakes or other bodies of water. #