Root growth in higher plants is sensitive to excess ammonium (NH(4)(+)). Our study shows that contact of NH(4)(+) with the primary root tip is both necessary and sufficient to the development of arrested root growth under NH(4)(+) nutrition in Arabidopsis. We show that cell elongation and not cell division is the principal target in the NH(4)(+) inhibition of primary root growth. Mutant and exp...

In the Author Contributions section, Nathalie J. M. van Hees (NH), Erik J. Giltay (EG), Thomas Puvill (TP), Nadine Janssen (NJ), and Willem van der Does (WD) all should be listed as one of the persons who wrote the paper. The correct contributions are: Conceived and designed the experiments: NH EGWD. Performed the experiments: NH TP NJ. Analyzed the data: NH EG TP NJ WD ST. Contributed reagents...

Ardis L. Olson, MD;1 Cecelia A. Gaffney, MEd;1 Viking A. Hedberg, MD, MPH;2 Wendy Gladstone, MD;3 Sam Dugan, MD;4 Robert Mathes, MD;5 Paul Reiss, MD6 1Dartmouth Medical School, Hanover, NH 2Plymouth Pediatrics, Dartmouth-Hitchcock Clinic, Plymouth, NH 3Exeter Pediatric Associates, Exteter, NH 4Bedford Pediatrics, Dartmouth-Hitchcock Clinic, Bedford, NH 5Abenaki Family Physicians, Wolfeboro Fall...

Rhbg is a membrane glycoprotein that is involved in NH(3)/NH(4)(+) transport. Several models have been proposed to describe Rhbg, including an electroneutral NH(4)(+)/H(+) exchanger, a uniporter, an NH(4)(+) channel, or even a gas channel. In this study, we characterized the pH sensitivity of Rhbg expressed in Xenopus oocytes. We used two-electrode voltage clamp and ion-selective microelectrode...

Negative impacts on the environment, bird well-being, and farm worker health indicate the need for abatement strategies for poultry litter NH(3) generation. Type of bedding affects many parameters related to poultry production including NH(3) losses. In a randomized complete block design, 3 trials compared the cumulative NH(3) volatilization for laboratory-prepared litter (4 bedding types mixed...

Interest in quotidian (daily) hemodialysis (HD) is growing. Some advocate short-hours high-efficiency daily HD (SDH) and others long-hours slow-flow nocturnal HD (NH) while the patient is asleep, both being used 5 to 7 d/week. The London Daily/Nocturnal Hemodialysis Study was the first attempt to obtain data of SDH and NH that may be compared with conventional thrice weekly HD (CH). This was a ...

Advanced photolithography developed for the semiconductor industry has been used to fabricate interdigitated microelectrode arrays that pass steady-state limiting currents of up to 230 nArmM analyte — 2.5 times more than the most sensitive interdigitated array built to date, and exhibit response times of ;5 ms. This performance results from the small interelectrode gap and the large active area...

O objetivo desse trabalho foi produzir mudas de espécie florestal da caatinga (Sabiá – Mimosa caesalpiniifolia Benth) submetidas a diferentes níveis irrigação, no viveiro do Centro Saúde e Tecnologia Rural/CSTR, Campus Patos PB. Seguiu-se um delineamento inteiramente casualisado (DIC), com 5 irrigação (L) acordo as necessidades hídricas das plantas (NH), sendo os seguintes: L1 (100%NH); L2 (80%...

A series of aluminium derivatives containing substituted bidentate and symmetrical tridentate pyrrolyl ligands, [C(4)H(3)NH(2-CH(2)NH(t)Bu)] and [C(4)H(2)NH(2,5-CH(2)NH(t)Bu)(2)], in toluene or diethyl ether were synthesized. Their reactivity and application for the ring opening polymerization of ε-caprolactone have been investigated. The reaction of AlMe(3) with one equiv. of [C(4)H(3)NH(2-CH(...