Results 121 to 130 of about 1,249,363 (328)
Ambient nitrate switches the ammonium consumption pathway in the euphotic ocean
Nature Communications, 2018 Phytoplankton assimilation and microbial oxidation of ammonium are two critical conversion pathways in the marine nitrogen cycle. The underlying regulatory mechanisms of these two competing processes remain unclear. Here we show that ambient nitrate acts
X. Wan +8 more
semanticscholar +1 more source
Transcriptomics of ammonium nutrition in the conifer Pinus pinaster Aiton [PDF]
, 2019 Nitrogen is an important element for all living beings because it is part of macromolecules as significant as nucleic acids or amino acids. For plants, it constitutes a limiting factor in their growth and development1 due to their low natural ...
Canovas-Ramos, Francisco Miguel +5 more
core
Calculation of the bulk modulus of mixed ionic crystal NH_4Cl_{1-x}Br_x [PDF]
arXiv, 2017 The ammonium halides present an interesting system for study in view of their polymorphism and the possible internal rotation of the ammonium ion. The static properties of the mixed ionic crystal NH$_4$Cl$_{1-x}$Br$_x$ have been recently investigated, using three-body potential model (TDPM) by the application of Vegard's law.
arxiv
Revista Brasileira de Ciência do Solo, 2012 O transporte de poluentes via escoamento superficial em áreas agrícolas, principalmente na forma solúvel, é considerado um problema ambiental, mesmo em sistemas conservacionistas de preparo do solo.
Adriana Timofiecsyk +3 more
doaj
Reentrant superconductivity in a composite formed by YBa$_2$Cu$_3$O$ _{7-δ}$ and Ammonium Terbium Oxalate [PDF]
arXiv, 2017 We present a study of reentrant behavior in a composite formed by a Hight-T$ _{c} $ superconductor, YBa$_2$Cu$_3$O$ _{7-\delta}$ and Ammonium Terbium Oxalate, Tb(H$_2$O)(C$ _2$O$_4$)$_2$ $\cdot $NH$_4$. The composite has a transition temperature about 92 K, and it presents a reentrant behaviour resulting of the coexistence between superconductivity and
arxiv
Pesquisa Agropecuária Brasileira, 2005 O objetivo deste trabalho foi avaliar o efeito do alumínio sobre a capacidade das cultivares de arroz Fernandes (tolerante) e Maravilha (sensível) de modificar o pH de soluções nutritivas com diferentes proporções de NO3-/NH4+ .
Renilton Joaquim de Mendonça +3 more
doaj +1 more source
Evidence for ammonium-bearing minerals in Ceres [PDF]
Evidence for ammonium-bearing minerals was found on the surface of the largest asteroid Ceres. The presence of ammonium-bearing clays suggests that Ceres has experienced a period of alteration by substantial amounts of an ammonium-bearing fluid.
Brown, R. H. +5 more
core +1 more source
Meteoritic Tutton salt, a naturally inspired reservoir of cometary and asteroidal ammonium [PDF]
arXivThe lack of benchmark data on the real minerals, native ammonium carriers in Solar System gives rise to controversial opinions on extraterrestrial ammonium reservoirs. We herein report on discovery of the first mineral carrier of meteoritic ammonium and show its relevance to the compositional and spectral characteristics of cometary and asteroidal ...
arxiv
Optical Properties of Nanoporous Al2O3 Matrices with Ammonium Dihydrogen Phosphate Crystals in Nanopores [PDF]
arXiv, 2019 In this paper, the technology of growing ammonium dihydrogen phosphate (ADP) crystals in pores of nanoporous aluminum oxide (Al2O3) matrices was presented. On the grown nanocomposites, the optical properties of such structures were studied. In particular, the direct and diffuse optical transmission, as well as specular reflection of Al2O3 matrices with
arxiv
The activation of tryptophanase apo-enzyme by potassium, ammonium and rubidium ions [PDF]
, 1954 Frank Charles Happold, A Struyvenberg
openalex +1 more source