background: toxoplasmosis, a worldwide zoonotic disease, is caused by toxo­plasma gondii . the distribution of genetic diversity of t. gondii in wild animals is of great importance to understand the transmission of the parasite in the environ­ment. however, little is known about t. gondii prevalence in wild animals and birds in china. methods: we conducted the genetic characterization of t. gon...

Ori en ta tion sur veys are an es sen tial part of any largescale geo chem i cal pro gram be cause they serve to es tab lish op ti mum sam pling and an a lyt i cal tech niques. Among vari ables that need to be de ter mined by a soils ori en ta tion are the sam ple den sity, soil ho ri zon, sam ple grain size or min eral frac tion, and an a lyt i cal method. Es tab lish ing geo chem i cal back g...

background: saliva is an alternative biological matrix in drug testing. it has several advantages in comparison with other biological fluids such as blood and urine. collection of saliva is simple, noninvasive and can be controlled under direct observation in drug abusers, or opium addicts.   methods: in the present study we report our experience with saliva collection, liquid-liquid extraction...

the objective of this study is to model and estimate the effect of financial services in the agricultural sector of iran on the value added of this sector. moreover, since as of 1984, the interest free banking law was implemented, the effect of this change on the value added of the sector will be studied as the second objective. the model of the study consists of three tions. the volume of real...

The inverse problem of identifying an unknown source control param- eter in a semilinear parabolic equation under an integral overdetermina- tion condition is considered. The series pattern solution of the proposed problem is obtained by using the weighted homotopy analysis method (WHAM). A description of the method for solving the problem and nding the unknown parameter is derived. Finally, tw...

Adaptive Finite Element Simulation of Currents at Mi roele trodes to a Guaranteed A ura y. Appli ation to Channel Mi roband Ele trodes. Kathryn Harriman David Gavaghan Paul Houston David Kay Endre S uli We extend our earlier work (see K. Harriman et al., Te hni al Report NA99/19) on adaptive nite element methods for dis ele trodes to the ase of rea tion me hanisms to the in reasingly popular h...

| This paper proposes a new method to reduce training time for neural nets used as function approximators. This method relies on a geometrical control of Multilayer Perceptrons (MLP). A geometrical initializa-tion gives rst better starting points for the learning process. A geometrical parametriza-tion achieves then a more stable convergence. During the learning process, a dynamic geometrical c...

Background: Saliva is an alternative biological matrix in drug testing. It has several advantages in comparison with other biological fluids such as blood and urine. Collection of saliva is simple, noninvasive and can be controlled under direct observation in drug abusers, or opium addicts. Methods: In the present study we report our experience with saliva collection, liquid-liquid extraction a...