The principle of natural selection, thus formulated, has the... HJ Hamilton - 《Zygon®》 被引量: 24发表: 1977年 A four elements porous model to estimate the strength of unsaturated soils One of the most prevalent relationships for effective stresses on unsaturated soils was proposed by ...
The 172 keV photopeak was integrated with a region-of-interest procedure, and each datum corrected for rate-related losses before fitting to an exponential function by a nonlinear least-squares procedure. The half-life found is 5.580 ± 0.032 h, where the uncertainty is an estimate of the 95...
The half-life acts on an exponential decay, which means that two half-lives correspond of half of a half (one-fourth) instead of the entire substance being depleted.Answer and Explanation: Given: t=29.1 yr is the half-life of...
The half-life is useful to estimate the dosing interval, the duration of action of a drug, and the time required to attain steady-state plasma concentrations during a multiple dosage regimen. The volume of distribution and clearance of a drug influence the half-life (eqn [6]). For example...
PASylation: a biological alternative to PEGylation for extending the plasma half-life of pharmaceutically active proteins A major limitation of biopharmaceutical proteins is their fast clearance from circulation via kidney filtration, which strongly hampers efficacy both in an......
The lake is frozen during the winter months allowing sediment coring through the ice cover. The precise chronology for sediment accumulation in the lake was obtained by varve counting for a period of 6300 years with an error of <1% Extraction of biogenic silica from the sediments The sediments...
Using a technique known ascarbon dating, it’s possible to estimate the age of an organic compound. While a plant or animal is alive, the carbon in the living organism is constantly renewed, and the ratio of carbon-12 to carbon-14 remains constant. This process of renewal stops when the...
A Kaplan-Meier plot was used to estimate the half-life time of the children developing treatment failure. In addition, the Log-rank test was used to see the degree of discrepancy between the predictor variable and the actual one. The Cox proportional hazard model was checked through the ...
We have the following: each half-life is {eq}A_o = 6.93\ \text{days} {/eq} Now, let's investigate the number of half lives required {eq}\begin{ali...Become a member and unlock all Study Answers Start today. Try it now Cr...
half-life of a radioactive element is defined as the time that it takes for one-half a quantity of the element to decay. Radioactive Carbon-14 is found in all living organisms and has a half-life of 5730 years. Archaeologists use this information to estimate the age of fossils. Consider...