Nano-crystalline particles of CeO2 have been synthesized by a low temperature chemical precipitation method. The precursor materials used in this research were Ce(NO3)3.6H2O, NaOH and diethylene glycol as surfactant. X-ray powder diffraction results showed that face centered cubic CeO2 nanoparticles with crystalline size in nanometer scale were formed. Scanning electron microscopy measurement s...

haploid microspore-derived embryos (mdes) of wheat were obtained by in vitro androgenesis. these  embryos were employed to evaluate the transient expression of gus gene (uida) following particle bombardment. using the bio-rad pds-1000/he system, the physical parameters including rupture disk pressure (900, 1100 and 1350 psi); microprojectile travel distance (6 and 9 cm); gold particles size (0....

As many particle-associated contaminants and nutrients are supply controlled, the question of particle source is crucial. In addition, sediment storage has important implications for the delivery and fate of pollutants. Increased accumulations of fine sediment ( < 63 Am) in gravel beds not only modify benthic habitat but also increase the retention time of sediment-associated contaminants in th...

An IgG2 monoclonal antibody (mAb) solution was subjected to stirring, generating high concentrations of nanometer and subvisible particles, which were then successfully size-enriched into different size bins by low-speed centrifugation or a combination of gravitational sedimentation and fluorescence-activated cell sorting (FACS). The size-fractionated mAb particles were assessed for their abili...

Occupational exposure to crystalline silica is a well-established occupational hazard. Once in the lung, crystalline silica particles can result in the activation of alveolar macrophages potentially leading to silicosis, a fibrotic lung disease. Because the activation of alveolar macrophages is the beginning step in a complicated inflammatory cascade, it is necessary to define the particle char...

Various types of aerosols affect cloud microphysical properties and cloud lifetime through the so-called “indirect effect”. The decrease of particles size when the cloud is polluted by small aerosol particles serving as additional cloud condensation nuclei and the reduction of the efficiency of the precipitation forming processes are phenomena described in numerous recent studies (Bréon et al. ...