Nitrogen

Publication Title: 
Journal of Agricultural and Food Chemistry
Author(s): 
Visek, W. J.
Publication Title: 
PloS One

The traditional view on dietary restriction has been challenged with regard to extending lifespan of the fruit fly Drosophila melanogaster. This is because studies have shown that changing the balance of dietary components without reduction of dietary intake can increase lifespan, suggesting that nutrient composition other than dietary restriction play a pivotal role in regulation of longevity. However, this opinion has not been reflected in yeast aging studies.

Author(s): 
Wu, Ziyun
Liu, Shao Quan
Huang, Dejian
Publication Title: 
Annals of Botany

BACKGROUND AND AIMS: The resurgence of malaria, particularly in the developing world, is considerable and exacerbated by the development of single-gene multi-drug resistances to chemicals such as chloroquinone. Drug therapies, as recommended by the World Health Organization, now include the use of antimalarial compounds derived from Artemisia annua--in particular, the use of artemisinin-based ingredients. Despite our limited knowledge of its mode of action or biosynthesis there is a need to secure a supply and enhance yields of artemisinin.

Author(s): 
Davies, Michael J.
Atkinson, Christopher J.
Burns, Corrinne
Woolley, Jack G.
Hipps, Neil A.
Arroo, Randolph R. J.
Dungey, Nigel
Robinson, Trevor
Brown, Paul
Flockart, Ian
Hill, Colin
Smith, Lydia
Bentley, Steven
Publication Title: 
Talanta

Synergistic liquid-liquid extractive spectrophotometric determination of gold(III) using 1-(2',4'-dinitro aminophenyl)-4,4,6-trimethyl-1,4-dihydro pyrimidine-2-thiol [2',4'-dinitro APTPT] has been described. Equal volumes (5cm(3)) of the 2',4'-dinitro APTPT (0.02molL(-1)) in the presence of pyridine (0.5molL(-1)) form an orange-red coloured ternary complex with gold(III) of molar ratio 1:1:1 at pH 1.8-2.4 with 5min of shaking. The absorbance of coloured organic layer in 1,2-dichloroethane is measured spectrophotometrically at 445nm against reagent blank.

Author(s): 
Kamble, Ganesh S.
Kolekar, Sanjay S.
Han, Sung H.
Anuse, Mansing A.
Publication Title: 
Fitoterapia

Black cohosh preparations are popular dietary supplements among women seeking alternative treatments for menopausal complaints. For decades, triterpene glycosides and phenolic acids have dominated the phytochemical and biomedical research on this plant. In this study, we provide evidence that black cohosh contains an unexpected and highly diverse group of secondary nitrogenous metabolites previously unknown to exist in this plant.

Author(s): 
Nikolic, Dejan
Gödecke, Tanja
Chen, Shao-Nong
White, Jerry
Lankin, David C.
Pauli, Guido F.
van Breemen, Richard B.
Publication Title: 
Journal of Animal Science

Two experiments were conducted to assess effects of endophyte treatments (Exp. 1), forage species (Exp. 2), and supplementation (Exp. 2) on urea production, excretion, and recycling in beef steers. Infusion of (15,15)N-urea and enrichment of urea in urine samples were used to calculate urea-N entry and recycling to the gut. Acceptably stable enrichment of (15)N-urea in urine was obtained after 50 h of intrajugular infusion of (15,15)N-urea, indicating that valid data on urea metabolism can be obtained from steers fed forages twice daily.

Author(s): 
Huntington, G. B.
Magee, K.
Matthews, A.
Poore, M.
Burns, J.
Publication Title: 
Proceedings of the National Academy of Sciences of the United States of America

Nitrogen acquisition and assimilation is a primary concern of insects feeding on diets largely composed of plant material. Reclaiming nitrogen from waste products provides a rich reserve for this limited resource, provided that recycling mechanisms are in place. Cockroaches, unlike most terrestrial insects, excrete waste nitrogen within their fat bodies as uric acids, postulated to be a supplement when dietary nitrogen is limited.

Author(s): 
Sabree, Zakee L.
Kambhampati, Srinivas
Moran, Nancy A.
Publication Title: 
Journal of Animal Science

Six experiments were conducted to evaluate dietary cation-anion difference (DCAD) in concentrate diets on urinary pH, feedlot performance, and N mass balance. In Exp. 1, 15 wether lambs (33.5 ± 3.0 kg) in five 3 × 3 Latin squares were fed a basal diet of 82.5% dry-rolled corn (DRC), 7.5% alfalfa hay, 5% molasses, and 5% supplement with different proportions of anionic and cationic salts. The DCAD was -45, -24, -16, -8, 0, +8, +16, +24, +32, and +40 mEq per 100 g of DM with the control basal diet (DCAD = +8) included in each square.

Author(s): 
Luebbe, M. K.
Erickson, G. E.
Klopfenstein, T. J.
Greenquist, M. A.
Benton, J. R.
Publication Title: 
The American Journal of Clinical Nutrition

During 1977 and 1978, 17 obese but otherwise healthy adult Americans died suddenly of ventricular arrhythmias during or shortly after completing rapid, massive weight reduction induced by very low-calorie diets consisting largely of collagen hydrolysates for 2 to 8 months. A reexamination of the data on these victims has disclosed a significant positive correlation (r = 0.824) between their prediet body mass index and their duration of survival on the very low-calorie diets.

Author(s): 
van Itallie, T. B.
Yang, M. U.
Publication Title: 
The American Journal of Clinical Nutrition

Six morbidly obese subjects were maintained in a metabolic ward for 64 days on liquid diets providing 600 to 800 kcal/day. Three received protein at a level of 1.5 g/kg desirable weight per day. The other three were given an identical diet in which half the protein was replaced by carbohydrate. Because there were no significant differences in either mean protein or mean fat losses between the two groups, the data on all six subjects were combined. Over the 64 days, the mean weight loss (+/- SEM) of the subjects per 1000 kcal deficit was 174.3 +/- 25.5 g.

Author(s): 
Yang, M. U.
van Itallie, T. B.

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