Mechanisms of natural attenuation of arsenic (As) by wetland plants may be classified by plant uptake and adsorption and/or co-precipitation by iron (oxy)hydroxide formed on the root surface of plants or in rhizosediment. A natural Cattail (Typha spp.) wetland impacted by tailings containing high levels of As from the Myungbong abandoned Au Mine, South Korea was selected, and the practical capa...

  Introduction:  The use of radioactive iodine (131I) has become an important adjunct to the treatment of thyroid cancer and hyperthyroidism. Salivary gland has the ability to concentrate radioactive iodine under normal circumstances. Salivary gland dysfunction and dry mouth are the common side effectsof high-dose radioiodine therapy. The purposeof this stu...

The sound attenuation of a silencer consisting lamella network made with melamine foam inserted in rectangular duct is investigated numerically and experimentally. arrangement designed so that skeleton bending elastic resonances appear at low frequency. In addition to this phenomenon, viscothermal losses the porous material ensure broadband attenuation. provides natural sub-wavelength resonator...

Prior Converted Croplands (PCCs) are historic wetlands that were transformed (drained, dredged, filled or leveled) to support production of agricultural crops prior to “Swampbuster” provisions of the 1985 Food Security Act. Our research suggests that PCCs can substantially reduce nitrate export from agricultural watersheds in the region, an ecosystem function shared with natural and restored we...

elastic energy of seismic wave is lost through propagation into the earth. various factors affect seismic energy. some of them are frequency independent and recovered in processing steps. but other factors such as intrinsic absorption of medium are frequency dependent and cannot be recovered by processing methods. lost energy caused by these factors is called attenuation. there are various meth...

Surgical excision of cancerous tumors and the human stress response can lead to metastasis of tumor cells. Furthermore, the medications used during the perioperative period (eg, opioids and anesthetic agents) have been shown to inhibit or suppress natural killer (NK) cell activity, one of the body's main defenses against spread of cancer. There are currently no anesthetic regimens that have bee...

Natural attenuation is a major ecosystem function allowing to abate soil organic contaminants such as polycyclic aromatic hydrocarbons (PAHs). Biodegradation of PAHs classically considered the driver natural attenuation, yet role abiotic transformation, including photodegradation, chemical oxidation, formation non-extractable residues, and polymerization, has been overlooked due lack investigat...

amplitudes of seismic waves decrease with distance according to anelastic properties of the earth and geometrical spreading. the attenuation of ground-motion amplitudes in the frequency domain is an important problem in engineering seismology. it is of particular practical interest in the regions such as zagros (iran). the zagros fold- thrust belt, as a part of alpine- himalayan orogenic belt i...