Ammonium Sulfate ACS Crystals

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• Journal of Experimental Botany. 2017 Mar Ammonium as a signal for physiological and morphological responses in plants

  Ammonium is a major inorganic nitrogen source for plants. At low external supplies, ammonium promotes plant growth, while at high external supplies it causes toxicity. Ammonium triggers rapid changes in cytosolic pH, in gene expression, and in post-translational modifications of proteins, leading to apoplastic acidification, co-ordinated ammonium uptake, enhanced ammonium assimilation, altered oxidative and phytohormonal… Read Abstract

• Applied and Environmental Microbiology. 1990 Dec Mechanism by which ammonium bicarbonate and ammonium sulfate inhibit mycotoxigenic fungi.

  In this study we examined the mechanism by which ammonium bicarbonate inhibits mycotoxigenic fungi. Elevated extracellular pH, alone, was not responsible for the antifungal activity. Although conidia of Penicillium griseofulvum and Fusarium graminearum had internal pH (pHi) values as high as 8.0 in buffer at an external pH (pHo) of 9.5, their viability was not… Read Abstract

• Chemosphere. 2015 Sep Combination of powdered activated carbon and powdered zeolite for enhancing ammonium removal in micro-polluted raw water.

  Even zeolite is promising in ammonia pollution disposing, its removal efficiency is frequently interfered by organics. As activated carbon has good removal efficiency on organic contaminants, combination of two adsorbents may allow their respective adsorption characteristics into full play. This paper provides a performance assessment of the combination for enhancing ammonium removal in micro-polluted raw… Read Abstract

• Journal of Pharmaceutical Sciences. 2014 Aug Physical characterisation and long-term stability studies on quaternary ammonium palmitoyl glycol chitosan (GCPQ)--a new drug delivery polymer.

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• Acta Physiologica. 2015 Jun Ammonium increases Ca(2+) signalling and upregulates expression of Cav1.2 gene in astrocytes in primary cultures and in the in vivo brain.

  AIM: The primary aim of this study was to identify the effects of hyperammonaemia on functional expression of Cav1.2 L-type Ca(2+) channels in astroglia.METHODS: Primary cultures of mouse astrocytes were used to study effects of chronic treatment (1-5 days) with ammonium chloride, at 1, 3 and 5 mm on depolarization-induced increases in free cytosolic Ca(2+)… Read Abstract

• Journal of Chromatography A. 2016 Dec Headspace gas chromatography based methodology for the analysis of aromatic substituted quaternary ammonium salts.

  The analysis of quaternary ammonium salts (QAS) using GC is often performed by “in injector” pyrolysis to create volatile degradation products for quantification purposes. Besides the risk of severe system contamination, the application of this approach on aqueous samples is problematic. In this work, the sample is treated in a vial with 2,2-dimethoxypropane (DMP) under… Read Abstract

• Stem Cells. 2015 Sep Brief Report: Human Mesenchymal Stem-Like Cells Facilitate Floating Tumorigenic Cell Growth via Glutamine-Ammonium Cycle.

  How mesenchymal stem cells (MSCs) promote tumor growth remains incompletely understood. Here, we show that mesenchymal stem-like cells (MSLCs) are commonly present in malignant pleural effusion or ascites of cancer patients, where they directly interact with tumor cells. Chemokines and chemokine receptors, especially the CCL2/CCR2 pathway, are involved in this interaction. As a result, MSLCs… Read Abstract

• International Journal of Food Microbiology. 2014 May New insights into the advantages of ammonium as a winemaking nutrient.

  Nitrogen limitation is the most common cause for stuck or sluggish fermentation in winemaking, and it is usually dealt with by supplementing grape juice with either ammonium salts or organic nutrients. These practices have a direct impact on both fermentation kinetics and the sensorial features of the final product. The aim of this work is… Read Abstract

• Science of the Total Environment. 2019 Jan Development of a polydimethylsiloxane-thymol/nitroprusside composite based sensor involving thymol derivatization for ammonium monitoring in water samples.

  This report describes a polydimethylsiloxane (PDMS)-thymol/nitroprusside delivery composite sensor for direct monitoring of ammonium in environmental water samples. The sensor is based on a PDMS support that contains the Berthelot’s reaction reagents. To prepare the PDMS-thymol/nitroprusside composite discs, thymol and nitroprusside have been encapsulated in the PDMS matrix, forming a reagent release support which significantly… Read Abstract

• Proceedings of the National Academy of Sciences of the United States of America . 2014 Jul Direct observation of electrogenic NH4(+) transport in ammonium transport (Amt) proteins.

  Ammonium transport (Amt) proteins form a ubiquitous family of integral membrane proteins that specifically shuttle ammonium across membranes. In prokaryotes, archaea, and plants, Amts are used as environmental NH4(+) scavengers for uptake and assimilation of nitrogen. In the eukaryotic homologs, the Rhesus proteins, NH4(+)/NH3 transport is used instead in acid-base and pH homeostasis in kidney… Read Abstract

• Journal of Experimental Botany. 2017 Mar Ammonium as a signal for physiological and morphological responses in plants

  Ammonium is a major inorganic nitrogen source for plants. At low external supplies, ammonium promotes plant growth, while at high external supplies it causes toxicity. Ammonium triggers rapid changes in cytosolic pH, in gene expression, and in post-translational modifications of proteins, leading to apoplastic acidification, co-ordinated ammonium uptake, enhanced ammonium assimilation, altered oxidative and phytohormonal… Read Abstract

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