Search Results - "Zasoski, R. J."

Active silicon uptake by wheat by Rains, D.W, Epstein, E, Zasoski, R.J, Aslam, M

“…The absorption of Si by wheat, Triticum aestivum L. 'Yecora Rojo,' followed Michaelis–Menten kinetics over a concentration range of 0.004–1.0 mM. Km and Vmax…”
Get full text

Hyphal-mediated transfer of nitrate, arsenic, cesium, rubidium, and strontium between arbuscular mycorrhizal forbs and grasses from a California oak woodland by Meding, S.M., Zasoski, R.J.

“…Arbuscular mycorrhizal (AM) fungi colonize most plant species in the savannah/oak woodland ecosystem of the California Sierra Foothills. These fungi may form…”
Get full text

Fertility and pH effects on polyphenol and condensed tannin concentrations in foliage and roots by Kraus, T.E.C, Zasoski, R.J, Dahlgren, R.A

“…Plant secondary compounds such as polyphenols and tannins are purported to influence nutrient cycling by affecting organic matter degradation, mineralization…”
Get full text

Linking chemical reactivity and protein precipitation to structural characteristics of foliar tannins by KRAUS, T. E. C, YU, Z, PRESTON, C. M, DAHLGREN, R. A, ZASOSKI, R. J

“…Tannins influence ecosystem function by affecting decomposition rates, nutrient cycling, and herbivory. To determine the role of tannins in ecological…”
Get full text

Contribution of Amino Compounds to Dissolved Organic Nitrogen in Forest Soils by Yu, Z., Zhang, Q., Kraus, T. E. C., Dahlgren, R. A., Anastasio, C., Zasoski, R. J.

“…Dissolved organic nitrogen (DON) may play an important role in plant nutrition and nitrogen fluxes in forest ecosystems. In spite of the apparent importance of…”
Get full text

Importance of Mn(III) Availability on the Rate of Cr(III) Oxidation on δ-MnO2 by Nico, Peter S, Zasoski, Robert J

“…The oxidation of Cr(III) to Cr(VI) significantly increases its mobility and toxicity and therefore its environmental hazard. The oxidation rate of aqueous…”
Get full text

Ammonium fixation in sub-grade decomposed granite substrates by Rider, D, Zasoski, R.J, Claassen, V.P

“…Granitic materials represent a common erosive substrate in California and much of the western United States. When granitic rocks weather, they disintegrate…”
Get full text

Nitrogen sink strength of ectomycorrhizal morphotypes of Quercus douglasii, Q. garryana, and Q. agrifolia seedlings grown in a northern California oak woodland by He, X. H, Horwath, W. R, Zasoski, R. J, Aanderud, Z, Bledsoe, C. S

“…Little information is known on what the magnitude of nitrogen (N) processed by ectomycorrhizal (ECM) fungal species in the field. In a common garden experiment…”
Get full text

Interaction of lime, organic matter and fertilizer on growth and uptake of arsenic and mercury by Zorro fescue (Vulpia myuros L.) by Heeraman, D.A., Claassen, V.P, Zasoski, R.J.

“…The Sulphur Bank Mercury Mine (SBMM) is an abandoned open pit mine located on the eastern shores of Clear Lake, California. Revegetation efforts have been…”
Get full text

Soil pH and the activity of a pelletized nematophagous fungus by JAFFEE, B. A, ZASOSKI, R. J

“…ABSTRACT When formulated as assimilative hyphae in alginate pellets, the nematophagous fungus Hirsutella rhossiliensis was more active (i.e., parasitized more…”
Get full text

Carbon and nitrogen dynamics in a forest soil amended with purified tannins from different plant species by Kraus, Tamara E.C., Zasoski, Robert J., Dahlgren, Randy A., Horwath, William R., Preston, Caroline M.

“…Tannins are purported to be an important factor controlling nitrogen cycling in forest ecosystems, and the ability of tannins to bind proteins in…”
Get full text

Microbial effects in maintaining organic and inorganic solution phosphorus concentrations in a grassland topsoil by Seeling, B. (Georg-August Univ., Goettingen (Germany). Inst. of Agricultural Chemistry), Zasoski, R.J

“…Replenishment of soil solution organic and inorganic P in a sterile and nonsterile grassland soil amended with 0 and 235 kg P ha⁻¹ for 13 consecutive years was…”
Get full text

Mn(III) Center Availability as a Rate Controlling Factor in the Oxidation of Phenol and Sulfide on δ-MnO2 by Nico, Peter S, Zasoski, Robert J

“…Manganese oxides are involved in many environmentally important redox reactions. This work focuses primarily on the reaction of phenol and sulfide with δ-MnO2…”
Get full text

Rapid photo-oxidation of Mn(II) mediated by humic substances by Nico, Peter S, Anastasio, Cort, Zasoski, Robert J

“…The oxidation of Mn(II) by O 2 to Mn(III) or Mn(IV) is thermodynamically favored under the pH and pO 2 conditions present in most near surface waters, but the…”
Get full text

Ammonium-potassium and ammonium-calcium exchange equilibria in bulk and rhizosphere soil by Chung, J.B. (Res. Inst. of Industrial Science and Technology, Chunnam, Korea.), Zasoski, R.J

“…This study was conducted to determine whether differential soil properties in bulk and rhizosphere soil could influence cation-exchange equilibria. The pH of…”
Get full text

Effects of VA-mycorrhizae and nitrogen sources on rhizosphere soil characteristics, growth and nutrient acquisition of coffee seedlings (Coffea arabica L.) by Vaast, P. (California Univ., Davis, CA (USA). Dept. of Land, Air and Water Resources), Zasoski, R.J

“…Effects of N sources (ammonium, nitrate and ammonitrate) and VA mycorrhizae (Glomus intraradices) on rhizosphere soil characteristics (pH, exchangeable…”
Get full text

A comparison of plant available nutrients on decomposed granite cut slopes and adjacent natural soils by Claassen, V. P., Zasoski, R. J.

“…Decomposed granite (DG) slopes are often difficult to revegetate after existing topsoil and vegetative cover have been removed. In this study, naturally…”
Get full text

Competing metal ion influences on Chromium (III) oxidation by birnessite by Fendorf, S.E, Zasoski, R.J, Burau, R.G

“…The oxidation of Cr(III) to Cr(VI) presents a significant environmental hazard due to the much greater mobility and toxicity of Cr(VI). Despite the importance…”
Get full text

Nitrogen source effects on rhizosphere pH and nutrient accumulation by Pacific Northwest conifers by ROLLWAGEN, B.A., ZASOSKI, R.J.

“…Nitrogen source effects on rhizosphere pH were evaluated for Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco], Sitka spruce [Picea sitchensis (Bong.) Carr.]…”
Get full text

Sorption and Sorptive Interaction of Cadmium and Zinc on Hydrous Manganese Oxide by Zasoski, R. J., Burau, R. G.

“…Adsorption of Zn, Cd, and Ca by δ‐MnO2 was measured at pH 4, 6, and 8 by a batch technique at steady‐state conditions. Fitting the data to Langmuir and…”
Get full text