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Quantitative structure–activity relationship (QSAR) models were developed to predict for CCR5 binding affinity of substituted 1-(3, 3-diphenylpropyl)-piperidinyl amides and ureas using multiple linear regression (MLR) and artificial neural network (ANN) techniques. A model with four descriptors, including Hydrogen-bonding donors HBD(R7), the partition coefficient between n-octanol and water logP and logP(R1) and Molecular weight MW(R7), showed good statistics both in the regression and artificial neural network with a configuration of (4-3-1) by using Bayesian and Leven-berg-Marquardt Methods. Comparison of the descriptor’s contribution obtained in MLR and ANN analysis shows that the contribution of some of the descriptors to activity may be non-linear.
present study we reported the feasibility of the Anethum graveolens as biosorbent to remove Pb(II) from aqueous
solutions. Anethum graveolens was
characterized by scanning electron microscopy and elemental analysis. The
ability of Anethum graveolens to
adsorb Pb(II) was investigated by using batch adsorption procedure. The effects
such as pH, contact time, adsorbate concentration and biosorbent dosage on the
adsorption capacity were studied. The experimental data were analysed using
various adsorption kinetic models viz., the pseudo-first and second-order
equations, Bangham’s equation, intraparticle diffusion and Elovich models.
Results show that the pseudo-second-order equation provides the best correlation for the
biosorption process. The equilibrium nature of Pb(II) adsorption at 30℃ has been described by the Langmuir, Freundlich,
Temkin and Redlich-Peterson isotherm models. The equilibrium data fit well on
Langmuir isotherm. The monolayer adsorption capacity of Pb(II) onto Anethum graveolens as obtained from
Langmuir isotherm at 30℃ was found to be 303 mg/g. This high adsorption
capacity of Anethum graveolens places
this biosorbent as one of the best adsorbents for removal of Pb(II) from
Annular pancreas is a rare congenital anomaly characterized by the presence of ectopic pancreatic tissue surrounding the duodenum. This malformation is usually asymptomatic in adults, but can manifests as pancreatitis, duodenal stenosis, or duodenal or gastric ulceration. We report the case of a young patient of 18 years old hospitalized for epigastric pain and vomiting, in whom radiological investigations showed an annular pancreas. At operation, a complete obstruction of the duodenum between its first and second parts was found, caused by an annular pancreas. No other congenital anomaly of the intra abdominal organs was noted. A gastroenterostomy was performed. Both the rarity of this congenital abnormality and its successful correction by surgical means have prompted us to make the following presentation.