Showing 4 results for Uric Acid
F. Khajehali, H. Nassiri Moghaddam, R. R. Marquardt, M. Danesh Mesgaran,
Volume 6, Issue 3 (10-2002)
Abstract
Evaluation of uric acid contents of poultry excreta was examined for use in the estimation of apparent protein digestibility. Uric acid was determined either by high-performance liquid chromatography or by spectrophotometric method. A high-pressure liquid chromatographic assay was used with absorbance measured at 285 nm. The method used a reverse-phase system with a C18-bonded column (250*4.6 mm, i.d.). The mobile phase was distilled deionized water. Injection volume was 20 l with a flow rate of 1 ml/min.
Correlation (r) between the two methods for uric acid content of excreta from birds fed diets with different methionine levels was 0.976. The uric acid values were then used to determine apparent protein digestibility. The apparent protein digestibility values, when corrected for uric acid nitrogen, were comparable with those calculated from amino acid analysis.
K. Etebari, M. Fazilati,
Volume 7, Issue 1 (4-2003)
Abstract
In order to investigate the effects of mineral compounds as complementary nutrients for silkworm, Bombyx mori, an experiment was performed in CRD with five treatments including: 1%, 5% and10% concentrations of multi-mineral mixtures (nitrogen, phosphorus and potassium) with normal and distilled water treatments as controls. The larvae were fed by mulberry leaves from Shien Ichenoise variety up to the fourth instar. From the beginning of the fourth instar, the supplementary leaves were used once a day. The supplementation of the leaves was done by spraying the solution on them. The amount of total protein and uric acid in haemolymph of a 6-day 5th instar larva was measured. The value of total protein compared to controls had significantly increased in all mineral treatments. The larvae's weight on the third day of the fifth instar had significant difference from controls, but the weight of silk gland did not show such a difference. However, uric acid of insect's blood demonstrated little differences but it showed no statistical significant differences from that in controlled insects. Despite this, the weight of cocoon, cocoon shell and pupa also had significant differences compared to controls, where this enhancement was higher in females than in males. Due to increase of the number of eggs, statistically there was a significant difference between the 10% treatment and others. The compounds had decreased the hatching percentage.
M. Behgar, M. Danesh Mesgaran, H. Nasiri Moghadam, S. Sobhani Rad,
Volume 11, Issue 40 (7-2007)
Abstract
This study was conducted to investigate the effect of formic and sulphuric acids on chemical composition, dry matter (DM) and crude protein (CP) degradability of alfalfa silage and its effect on early lactating Holstein cow as three trials. In the first trial, chopped alfalfa (22 and 33% DM) was ensiled with three levels of formic acid (0.0, 15 and 20 ml/kg DM) and two levels of sulphuric acid (0 and 4 ml/kg DM). In the second trial, DM and CP degradability coefficients of silages (Treatment 1: without acid Treatment 2: 15 ml formic acid + 4 ml sulphuric acid per kg DM) and alfalfa hay (Treatment 3) were determined using nylon bag technique in two cannulated steers. In the third trial, silages (treatments 1 and 2) were replaced with 50% of alfalfa hay in the early lactation Holstein cow diet (11 cows, 19 ± 8 days in milk). Diets were fed for 49 days. Dry matter intake, milk production and milk composition were evaluated. Blood metabolites were determined in weeks 4 and 6. Effect of wilting on pH was significant (p<0.05). Quickly degradable fraction (a) of DM was similar in both silages (0.35) but was higher (0.5) for hay rather than the silages. Slowly degradable fraction (b) of DM of the acid - treated silage was higher compared with the hay (0.39 and 0.32, respectively). Fraction (a) of CP in acid treated silage was less than the control silage and hay (0.46, 0.57 and 0.57, respectively). Fraction (b) of CP in
acid - treated silage was less compared with the control silage and hay (0.41, 0.28 and 0.35, respectively). There were no significant differences between the treatments on the cow’s performance. However, time effect on milk fat and solid non-fat was significant (p<0.01). Blood glucose concentration before feeding with treatment 2 was significantly higher (p<0.01) than cows feeding with treatment 1.
E Fatahi Kiasari , A Fotovvat, A.r Astaraei , Gh Haghnia ,
Volume 14, Issue 51 (4-2010)
Abstract
The contamination of soils with lead is a major environmental problem throughout the world. Phytoextraction of heavy metals from contaminated soils has the prospect of being a more economic in situ alternative. Chemically enhanced phytoextraction has been proposed as an effective approach to remove heavy metals from contaminated soil through the use of high biomass plants. Using a pot experiment, the effects of the application of three rates of EDTA at 0, 1.5 and 3 mmol/kg soil and sulfuric acid at 0, 0.5 and 1 mmol/kg soil with two rates of Pb at 0 and 200 mmol.kg-1 on the uptake of Pb by corn (Zea mays L. single cross 704 var.), sunflower (Helianthus annuus L. ajili var.), and cotton (Gossypium hirsutum L. varamin var.) plants were studied. The results showed that EDTA was more effective than sulfuric acid in increasing the concentration of Pb in shoots and roots for all plants studied. The maximum amount with application of EDTA to soil for shoots of corn, sunflower, and cotton were 4.07, 6.49 and 31.33 times higher than the control, respectively. EDTA also enhanced Pb content of roots of corn, sunflower, and cotton 3.38, 1.63 and 1.09 times higher than the control, respectively. DTPA-Pb was higher in soil treated with EDTA than sulfuric acid. The application of EDTA also significantly increased shoot-to-root ratio of Pb in plants examined. The results of this study showed that corn was able to phytoextract more Pb than sunflower and cotton.
