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The sedimentation coefficient (s) of a particle characterizes its sedimentation during centrifugation. It is defined as the ratio of a particle's sedimentation velocity to the applied acceleration causing the sedimentation. $${\displaystyle s={\frac {v_{t}}{a}}}$$The sedimentation speed $${\displaystyle v_{t}}$$ (in m/s) is also the terminal velocity. It is constant because the force applied to a particle by gravity or by a centrifuge (typically in multiples of ten

The sedimentation coefficient (s) of a particle characterizes its sedimentation during centrifugation. It is defined as the ratio of a particle's sedimentation velocity to the applied acceleration causing the sedimentation. $${\displaystyle s={\frac {v_{t}}{a}}}$$The sedimentation speed $${\displaystyle v_{t}}$$ (in m/s) is also the terminal velocity. It is constant because the force applied to a particle by gravity or by a centrifuge (typically in multiples of tens of thousands of gravities in an ultracentrifuge) is balanced by the viscous resistance (or "drag") of the fluid (normally water) through which the particle is moving. The applied acceleration a (in m/s ) can be either the gravitational acceleration g, or more commonly the centrifugal acceleration $${\displaystyle \omega ^{2}r}$$. In the latter case, $${\displaystyle \omega }$$ is the angular velocity of the rotor and r is the distance of a particle to the rotor axis (radius). The viscous resistance for a spherical particle is given by Stokes' law: 6πηr0v, where η is the viscosity of the medium, r0 is the radius of the particle and v is the velocity of the particle. Stokes' law applies to small spheres in an infinite amount of fluid. The centrifugal force is given by the equation: mrω , where m is the excess mass of the particle over and above the mass of an equivalent volume of the fluid in which the particle is situated (see Archimedes' principle) and r is the distance of the particle from the axis of rotation. When the two opposing forces, viscous and centrifugal, balance, the particle moves at constant (terminal) velocity. The terminal velocity for a spherical particle is given by the equation: $${\displaystyle {v_{t}}={\frac {mr\omega ^{2}}{6\pi \eta r_{0}}}}$$

Wikipedia Texte sous licence CC-BY-SASedimentation velocity allows the determination of purity or homogeneity of a macromolecular species (see the chapter by Arthur, Kendrick, Gabrielson, 2015 in this volume). If there are contaminants or aggregates, these can often be quantified by velocity methods down to 0.1–1%.

The erythrocyte sedimentation rate (ESR) is a general condition indicator and serves as a guide to determine diagnosis and treatment follow-up of different autoimmune diseases, acute and chronic infections and tumours.

Sédimentation Définition Classé sous : médecine Séparation du sang en ses composants liquide ( plasma ) et solide ( globules ) ; le sédiment - la partie solide - se dépose au fond du tube ...

Erythrocyte sedimentation rate is a hematological test that measures the rate of fall of a column of red cells in plasma in 1 hour when placed in a vertical tube. The principle applied in Erythrocyte sedimentation rate

Parasite sedimentation rates (estimated using Stoke's law for discrete particle settling) will vary between parasite species depending on the specific gravity and dimensions of the parasite and liquid density (and temperature) suggesting that eggs of Ascaris and Trichuris will be removed more effectively than eggs with slower rates of settling velocity, such as hookworm and (oo)cysts of protozoa (Table 31.2).

The constants in a Svedberg equation for estimating the molecular weight of a protein from the rate of movement in a centrifugal field. The Svedberg unit (S) is arbitrarily set at 1 × 10-13 sec and is often used to describe the sedimentation rate of macromolecules (e.g., 4 S RNA). Synonym(s): sedimentation

In this study, an attempt has been made to draw some correlations between sedimentation rate constants (overall sedimentation rate constant (Ko), sedimentation rate constant for constant rate...

Les sédiments se disposent en strates. S'il y a interruption dans la continuité de la sédimentation on parle de discordance. Entre deux strates, lorsque le sédiment n'est pas encore compacté, il y a glissement et donc formation d'un slump : les couches sont

Type 1 sedimentation is characterized by particles that settle discretely at a constant settling velocity, or by the deposition of Iron-Rich minerals to streamlines down to the point source. They settle as individual particles and do not flocculate or stick to

Sedimentation rate \(k_{settle}\) determines the speed at which particles (whether nanoparticles or suspended particulate matter, SPM) are removed from the water through sedimentation (sediment deposition).The higher the rate, the faster particles are removed. Predicting the sedimentation rate is needed in order to predict movement of particles from the water column to the sediment layer.

Sedimentation constant definition at Dictionary, a free online dictionary with pronunciation, synonyms and translation. Look it up now!

Type 1 sedimentation is characterized by particles that settle discretely at a constant settling velocity, or by the deposition of Iron-Rich minerals to streamlines down to the point source. They settle as individual particles and do not flocculate or stick to each other during settling. Example: sand and grit material

(sed'i-mĕn-tā'shŭn kon'stănt) The constants in a Svedberg equation for estimating the molecular weight of a protein from the rate of movement in a centrifugal field. The Svedberg unit (S) is arbitrarily set at 1 × 10 -13 sec and is often used to describe the sedimentation rate of macromolecules (e.g., 4 S RNA).

Thus, sedimentation rate calculations depend most heavily on nannofossil datums. Despite these limitations, five intervals of relatively constant sedimentation separated by hiatuses, mass flows, or condensed intervals are apparent in the age-depth plot (Fig. F12). Sedimentation Rates and Hiatuses . The upper 368 m of section at Site 1261 is unique among the five sites drilled during Leg 207 ...

Most of previous models assumed a constant sedimentation rate and thus may result in inaccurate estimates of total amount of hydrate within the HSZ. In this study, we developed a hydrate accumulation model that is capable of handling multiple sedimentation stages. Site 997 of ODP Leg 164, with data indicating its recent history of four sedimentation stages of different rates, is chosen to ...

refers to a constant flux-constant sedimentation rate (CF:CS) model (Crickmore, et al, 1990; Ballestra, et al, 1994). In many cases it is clear that rates of erosion and sedimentation have varied significantly during the past 150 years. In this event the 210Pb profile may be expected to be non-linear. There are essentially two models which are mathematically practicable for calculating 210Pb ...

Une vitesse de sédimentation trop basse, c’est-à-dire trop lente, est un phénomène assez rare. Il peut être causé par un trouble de la coagulation si le sang est trop épais ...

La vitesse de sédimentation s’obtient par un prélèvement sanguin effectué sur un anticoagulant (citrate de sodium). Elle est mesurée à deux moments : une heure et deux heures après le prélèvement. La VS est mesurée en millimètres de dépôts. Comment se préparer : Amenez l’ordonnance de prescription, la Carte Vitale et la carte de mutuelle. Venir de préférence à jeun et en ...

Sedimentation constant definition at Dictionary, a free online dictionary with pronunciation, synonyms and translation. Look it up now!

The overall sedimentation rate constant is also found to be dependent on slurry concentration for a constant particle size. Such dependence can be expressed with a fair degree of accuracy by the relation, Ko =A1(C) B 1 (9) The plot plotted between ln (Ko) versus ln (C) satisfies the relation expressed in equation (9). From the results (Table 6) it is observed that the value of B1 has decreased ...

Define sedimentation rate. sedimentation rate synonyms, sedimentation rate pronunciation, sedimentation rate translation, English dictionary definition of sedimentation rate. Noun 1. sedimentation rate - the rate at which red blood cells settle out in a tube of blood under standardized conditions; a high rate usually indicates...

This model proposes a decay constant (α) and sedimentation coefficient (s). The model can also be used to calculate the instantaneous sedimentation rate of the clay suspensions at any time and any depth for the settling cylinder. These sedimentary characteristics were simulated by adopting the established deposition model. The results show that the model is capable of predicting the time ...

Translations in context of "erythrocyte sedimentation rate" in English-Russian from Reverso Context: An erythrocyte sedimentation rate and a C-reactive protein.

rate of sedimentation for small particles is too low to give a practical analysis time, and because Brownian motion of small particles becomes too large to allow effective settling. A very narrow distribution of small particles will be reported as a broad distribution when the rate of particle diffusion is comparable to the sedimentation rate. Very small particles (<0.1 micron) never settle by ...

refers to a constant flux-constant sedimentation rate (CF:CS) model (Crickmore, et al, 1990; Ballestra, et al, 1994). In many cases it is clear that rates of erosion and sedimentation have varied significantly during the past 150 years. In this event the 210Pb profile may be expected to be non-linear. There are essentially two models which are mathematically practicable for calculating 210Pb ...

Introduction. The API sedimentation test (API RP 10B-2, Second Edition, April 2013, section 12.5) is an important test used to evaluate the stability of a cement slurry in static conditions, i.e. once placed in the well.The laboratory test method consists of placing the cement slurry in a metal tube and exposing the slurry to appropriate temperature and pressure conditions until set.

Une vitesse de sédimentation trop basse, c’est-à-dire trop lente, est un phénomène assez rare. Il peut être causé par un trouble de la coagulation si le sang est trop épais ...

La vitesse de sédimentation s’obtient par un prélèvement sanguin effectué sur un anticoagulant (citrate de sodium). Elle est mesurée à deux moments : une heure et deux heures après le prélèvement. La VS est mesurée en millimètres de dépôts. Comment se préparer : Amenez l’ordonnance de prescription, la Carte Vitale et la carte de mutuelle. Venir de préférence à jeun et en ...

Pyrite sulfur isotopes constrained by sedimentation . Alternatively, slow sedimentation rates could promote diffusive exchange between porewater and seawater sulfate, forming an “open” diagenetic system (McKay and Longstaffe, 2003), where a constant seawater sulfate supply precludes 34 S enrichment in porewater sulfate and therefore in the resulting sulfide (Claypool, 2004; Gomes and ...

Sedimentation constant definition of sedimentation ... sedimentation constant the constant s in the Svedberg equation for estimating the molecular weight of a protein from the rate of movement in a centrifugal field:where M is the molecular weight, R the gas constant, T the absolute temperature, D the diffusion constant (in square centimeters per second), the partial specific volume of the ...

It is constant because the drag force of the particle in the fluid is balanced by the centrifugal forces generated by the centrifuge. A centrifuge can generate forces several times higher than gravity so settling occurs much faster during centrifugation. Again, the ratio of two constants are constant so the sedimentation coefficient is constant.

The overall sedimentation rate constant is also found to be dependent on slurry concentration for a constant particle size. Such dependence can be expressed with a fair degree of accuracy by the relation, Ko =A1(C) B 1 (9) The plot plotted between ln (Ko) versus ln (C) satisfies the relation expressed in equation (9). From the results (Table 6) it is observed that the value of B1 has decreased ...

This model assumes a constant flux of unsupported 210 Pb to the sediment, allows the rate of sedimentation to vary over time. The applicable of CRS model was used to analysis of two bottom ...

Sedimentation rates were established according to the "Constant Flux:Constant Sedimentation" (CF:CS) (210)Pb dating model, which was preferred rather than the "Constant Rate of Supply-Minimum Variance" (CRS-MV) model. Variations in sediment grain-size were accounted for by application of several normalization procedures. Al was selected for grain-size correction. Corrected sedimentation rates ...

refers to a constant flux-constant sedimentation rate (CF:CS) model (Crickmore, et al, 1990; Ballestra, et al, 1994). In many cases it is clear that rates of erosion and sedimentation have varied significantly during the past 150 years. In this event the 210Pb profile may be expected to be non-linear. There are essentially two models which are mathematically practicable for calculating 210Pb ...

The rate of sedimentation is dependent upon the applied centrifugal field (G) ... Hence, the particle no longer accelerates but achieves a maximum velocity, with the result that it now sediments at a constant rate. Its rate of sedimentation (v) is then given by. v = dr/dt = 2r 2 p (ρ p-p m)ω 2 r = 9η. It is evident from this equation that the sedimentation rate of a given particle is ...

a constant sedimentation rate, the model estimates the average rate of deposition over the period involved. The model also has the important advantage that an estimate of the Table 1 The flood plain sites investigated in this study. Site/River Location Grid reference 1 Exe Stoke Canon, Devon SX 923963 2 Culm Silverton Mill, Devon SS 983012 3 Stour Spetisbury, Dorset ST 024023 4 Avon ...

Estuarine sedimentation rates are estimated for vertical increments of sediment cores by adjusting average rates between dated horizons with the ratio of pollen concentration to concentration of sediment. The method assumes independent influxes of pollen and sediment into the estuary, similar patterns of transport and deposition for both pollen and fine sediment, a uniform influx of pollen ...

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