UREA FOR THE PRESERVATION OF MOIST HAY IN BIG ROUND BALES

1987 ◽  
Vol 67 (4) ◽  
pp. 1043-1053 ◽  
Author(s):  
G. BÉLANGER ◽  
A.-M. ST-LAURENT ◽  
C. A. ESAU ◽  
J. W. G. NICHOLSON ◽  
R. E. McQUEEN
Keyword(s):  
Cell Wall ◽  
Nitrogen Content ◽  
Key Words ◽  
Microbial Activity ◽  
Total Nitrogen ◽  
Temperature Increase ◽  
Weight Basis ◽  
Ammonia Loss ◽  
Wet Weight ◽  
Urea Addition

Urea was evaluated in two experiments as a preservative of moist grass hay stored in big round bales. Three levels of urea: 0, 24 and 46 g urea kg−1 forage (wet weight basis) were applied to hay at two moisture levels (23 and 29%) in exp. 1. The effects of applying 40 g urea per kilogram forage having 23% moisture and of a plastic cover over the bales during storage were evaluated in exp. 2. Hay baled at 29% moisture in exp. 1 lost more moisture during storage, had a greater temperature increase and a higher ratio of acid detergent insoluble nitrogen to total nitrogen after storage than hay baled at 23% moisture. The addition of urea at a rate of 40 g kg−1 forage and above (wet weight basis) reduced microbial activity as indicated by lower bale temperatures during storage, subsequent lower cell wall concentration after storage and visual appraisal even though less than 45% of the urea was hydrolyzed. Urea addition also improved the digestibility of moist hay. The nitrogen content of hay was increased by approximately 14.5 g kg−1. The plastic cover over the bales did not increase the effect of urea even though it slightly reduced the ammonia loss to the air. Key words: Urea, moist hay, round bales, preservation

Dogfish Gelatin

1962 ◽  
Vol 19 (2) ◽  
pp. 321-326 ◽  
Author(s):  
Shirley E. Geiger ◽  
Eve Roberts ◽  
N. Tomlinson
Keyword(s):  
Total Nitrogen ◽  
Weight Basis ◽  
Melting Points ◽  
Wet Weight

Gelatin has been prepared from the skin and skeleton (separately) of the dogfish, Squalus suckleyi. The gelling and melting points of a 10% solution were 15 and 22 °C respectively, for gelatin from skin, and 14 and 23 °C for that from skeleton. The skin gelatin contained 16.3%, total nitrogen, 6.4% hydroxyproline, and 0.28% tyrosine. The corresponding values for skeleton gelatin were 15.7, 8.8, and 0.29%. Yields of gelatin were low, being 7% from skin and 2% from skeleton on a wet-weight basis.

Studies on the camparative physiology of Chara corallina. III. Nitrogen relations of internodal cell components during internodal cell expansion

1971 ◽  
Vol 19 (1) ◽  
pp. 1 ◽  
Author(s):  
MJ Mercer ◽  
FV Mercer
Keyword(s):  
Cell Wall ◽  
Nitrogen Content ◽  
Total Nitrogen ◽  
Higher Plants ◽  
Chara Corallina ◽  
Soluble Nitrogen ◽  
Internodal Cell ◽  
Wall Cell ◽  
Cell Components ◽  
Chloroplast Fraction

Changes in the total nitrogen content of single internodal cells and in the nitrogen content of the cell wall, chloroplast fraction, TCA-insoluble cytoplasmic fraction, cytoplasmic sap, and vacuolar sap during the growth of the internodal cell are described. The nitrogen content of all fractions increases as the cells expand from c. 10 �l to over 200 �l in volume, and protein increases in the cytoplasm, the chloroplast fraction, and the cell wall. Cell wall nitrogen accounts for over half the total nitrogen of the cell and the bulk of the soluble nitrogen is present in the cytoplasm; only about 1% is found in the vacuole. The observations are discussed in relation to the cells of higher plants.

scholarly journals Pemanfaatan Limbah Kulit Pisang Sebagai Pupuk Organik Cair dan Aplikasinya Terhadap Pertumbuhan Tanaman Kangkung Darat (Ipomea Reptans Poir)

2018 ◽  
Vol 6 (4) ◽  
pp. 219
Author(s):  
Ince Manis ◽  
Supriadi Supriadi ◽  
Irwan Said
Keyword(s):  
Plant Growth ◽  
Nitrogen Content ◽  
Plant Height ◽  
Total Nitrogen ◽  
Organic Liquid ◽  
Organic Fertilizer ◽  
Banana Peel ◽  
Liquid Fertilizer ◽  
Wet Weight ◽  
Number Of Leaves

Banana peel waste utilization as organic manure and its application has been made to the land kale plant growth (Ipomea reptans Poir). This paper aims to describe how to manufacture liquid organic fertilizer from the waste banana skin, determine the total nitrogen content of liquid organic fertilizer and the effect of liquid organic fertilizer waste banana skin on plant growth kale land (Ipomea reptans Poir). The method used was experimental at the stage of making a liquid organic fertilizer waste banana peel in fermentation, the determination of total nitrogen content and the application of the organic liquid fertilizer waste banana skin using a randomized block design (RBD) with 4 treatments include P0 (0 mL); P1 (20 mL); P2 (40 mL); and P3 (60 mL).The parameters measured were plant height (cm), the number of leaves (leaf) and wet weight (g). The growth data of the swamp cabbage land (Ipomea reptans poir) were analyzed by using the statistical test analysis of variance (ANOVA) then followed by Duncan test with significance level of 5%. The results showed that levels of total nitrogen of the organic liquid fertilizer waste was 0.032% and the application of the organic liquid fertilizer of banana peel waste on the growth of swamp cabbange land (Ipomea reptans poir) influence on plant height (cm) and wet weight (g) but have no effect on the number of leaves (leaf). Treatment P2 (40 mL) showed the best result for the average plant height (cm), the number of leaves (leaf) and wet weight (g) of the swamp cabbage land (Ipomea reptans poir).

Operational Results of the Wolfsburg Wastewater Treatment Plant

1992 ◽  
Vol 25 (4-5) ◽  
pp. 203-209 ◽  
Author(s):  
R. Kayser ◽  
G. Stobbe ◽  
M. Werner
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Nitrogen Content ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Phosphate Removal ◽  
Total Nitrogen Content ◽  
Activated Sludge Process

At Wolfsburg for a load of 100,000 p.e., the step-feed activated sludge process for nitrogen removal is successfully in operation. Due to the high denitrification potential (BOD:TKN = 5:1) the effluent total nitrogen content can be kept below 10 mg l−1 N; furthermore by some enhanced biological phosphate removal about 80% phosphorus may be removed without any chemicals.

scholarly journals Exploring the role of macroalgal traits on the feeding behaviour of a generalist herbivore in Malaysian waters

2020 ◽  
Vol 63 (5) ◽  
pp. 407-417
Author(s):  
Lim Wai Yin ◽  
Lim Phaik Eem ◽  
Affendi Yang Amri ◽  
Song Sze Looi ◽  
Acga Cheng
Keyword(s):  
South China Sea ◽  
Nitrogen Content ◽  
Total Nitrogen ◽  
South China ◽  
Nutritional Quality ◽  
Feeding Behaviour ◽  
Total Nitrogen Content ◽  
Generalist Herbivore ◽  
Macroalgal Species ◽  
Straits Of Malacca

AbstractWith the potential adverse effects of climate change, it is essential to enhance the understanding of marine ecosystem dynamics, which can be driven by the co-evolutionary interaction between autotrophs and herbivores. This study looked into the autotroph-herbivore interactions in Malaysian waters, mainly to determine if autotroph nutritional quality significantly influences herbivore consumption rates. We documented the relative consumption rate of a generalist herbivore (Chanos chanos Forsskål) obtained from the Straits of Malacca through multiple feeding trials using 12 macroalgal species collected from different coastal areas of the Straits of Malacca, the Straits of Johor, and the South China Sea. The herbivore fed selectively on the tested macroalgal species, with the most and least consumed species having the lowest and highest total nitrogen content, respectively. Besides total nitrogen content, the least consumed species also had the highest total phenolic content. Interestingly, we observed that the herbivore generally preferred to consume filamentous macroalgae, especially those collected from the South China Sea. Overall, our findings demonstrated that the feeding behaviour of a generalist herbivore could be influenced by the nutritional quality of the autotrophs, which may depend directly or indirectly on other factors such as autotroph morphology and geography.

On the Chemical Form of Mercury in Edible Fish and Marine Invertebrate Tissue

1992 ◽  
Vol 49 (5) ◽  
pp. 1010-1017 ◽  
Author(s):  
Nicolas S. Bloom
Keyword(s):  
Total Mercury ◽  
Marine Invertebrates ◽  
Marine Invertebrate ◽  
Chemical Form ◽  
Weight Basis ◽  
Atomic Fluorescence Spectrometry ◽  
Atomic Fluorescence ◽  
Saltwater Fish ◽  
Relative Standard ◽  
Wet Weight

Total mercury, monomethylmercury (CH3Hg), and dimethylmercury ((CH3)2Hg) in edible muscle were examined in 229 samples, representing seven freshwater and eight saltwater fish species and several species of marine invertebrates using ultraclean techniques. Total mercury was determined by hot HNO3/H2SO4/BrClldigestion, SnCl2 reduction, purging onto gold, and analysis by cold vapor atomic fluorescence spectrometry (CVAFS). Methylmercury was determined by KOH/methanol digestion using aqueous phase ethylation, cryogenic gas chromatography, and CVAFS detection. Total mercury and CH3Hg concentrations varied from 0.011 to 2.78 μg∙g−1 (wet weight basis, as Hg) for all samples, while no sample contained detectable (CH3)2Hg (<0.001 μg∙g−1 as Hg). The observed proportion of total mercury (as CH3Hg) ranged from 69 to 132%, with a relative standard deviation for quintuplicate analysis of about 10%; nearly all of this variability can be explained by the analytical variability of total mercury and CH3Hg. Poorly homogenized samples showed greater variability, primarily because total mercury and CH3Hg were measured on separate aliquots, which vary in mercury concentration, not speciation. I conclude that for all species studied, virtually ail (>95%) of the mercury present is as CH3Hg and that past reports of substantially lower CH3Hg fractions may have been biased by analytical and homogeneity variability.

scholarly journals THE MOLECULAR WEIGHT OF RHODOPSIN AND THE NATURE OF THE RHODOPSIN-DIGITONIN COMPLEX

1954 ◽  
Vol 37 (3) ◽  
pp. 381-399 ◽  
Author(s):  
Ruth Hubbard
Keyword(s):  
Molecular Weight ◽  
Single Molecule ◽  
Extinction Coefficient ◽  
Dry Weight ◽  
Weight Basis ◽  
Sedimentation Behavior ◽  
A Value ◽  
Wet Weight ◽  
Single Boundary ◽  
Stoichiometric Complex

The sedimentation behavior of aqueous solutions of digitonin and of cattle rhodopsin in digitonin has been examined in the ultracentrifuge. In confirmation of earlier work, digitonin was found to sediment as a micelle (D-1) with an s20 of about 6.35 Svedberg units, and containing at least 60 molecules. The rhodopsin solutions sediment as a stoichiometric complex of rhodopsin with digitonin (RD-1) with an s20 of about 9.77 Svedberg units. The s20 of the RD-1 micelle is constant between pH 6.3 and 9.6, and in the presence of excess digitonin. RD-1 travels as a single boundary also in the electrophoresis apparatus at pH 8.5, and on filter paper at pH 8.0. The molecular weight of the RD-1 micelle lies between 260,000 and 290,000. Of this, only about 40,000 gm. are due to rhodopsin; the rest is digitonin (180 to 200 moles). Comparison of the relative concentrations of RD-1 and retinene in solutions of rhodopsin-digitonin shows that RD-1 contains only one retinene equivalent. It can therefore contain only one molecule of rhodopsin with a molecular weight of about 40,000. Cattle rhodopsin therefore contains only one chromophore consisting of a single molecule of retinene. It is likely that frog rhodopsin has a similar molecular weight and also contains only one chromophore per molecule. The molar extinction coefficient of rhodopsin is therefore identical with the extinction coefficient per mole of retinene (40,600 cm.2 per mole) and the E(1 per cent, 1 cm., 500 mµ) has a value of about 10. Rhodopsin constitutes about 14 per cent of the dry weight, and 3.7 per cent of the wet weight of cattle outer limbs. This corresponds to about 4.2 x 106 molecules of rhodopsin per outer limb. The rhodopsin content of frog outer limbs is considerably higher: about 35 per cent of the dry weight, and 10 per cent of the wet weight, corresponding to about 2.1 x 109 molecules per outer limb. Thus the frog outer limb contains about five hundred times as much rhodopsin as the cattle outer limb. But the relative volumes of these structures are such that the ratio of concentrations is only about 2.5 to 1 on a weight basis. Rhodopsin accounts for at least one-fifth of the total protein of the cattle outer limb; for the frog, this value must be higher. The extinction (K500) along its axis is about 0.037 cm.2 for the cattle outer limb, and about 0.50 cm.2 for the frog outer limb.

Shearing force of alfalfa stems: Effects of genotype and year interactions

1998 ◽  
Vol 78 (4) ◽  
pp. 719-722
Author(s):  
A. D. Iwaasa ◽  
K. A. Beauchemin ◽  
S. N. Acharya ◽  
J. G. Buchanan-Smith
Keyword(s):  
Cell Wall ◽  
Medicago Sativa ◽  
Key Words ◽  
Chemical Constituents ◽  
Stem Segment ◽  
Shearing Force ◽  
Medicago Sativa L ◽  
Genotype Clustering ◽  
Force Characteristics

Shearing force of alfalfa (Medicago sativa L.) stems was measured to evaluate genotype-by-year interactions. Based on mean shearing force for each stem segment and genotype clustering criteria, several genotypes had similarly shearing forces among years. Therefore, selecting genotypes with desirable shearing force characteristics to improve digestibility or intake potential of forages may be possible. Key words: Genotype, environment, shearing force, cell wall chemical constituents

Amelioration of sodic soils with blue-green algae

Soil Research ◽  
1981 ◽  
Vol 19 (3) ◽  
pp. 361 ◽  
Author(s):  
D Subhashini ◽  
BD Kaushik
Keyword(s):  
Electrical Conductivity ◽  
Hydraulic Conductivity ◽  
Nitrogen Content ◽  
Total Nitrogen ◽  
Algal Growth ◽  
Algal Flora ◽  
Exchangeable Sodium ◽  
Sodic Soils ◽  
Blue Green Algae ◽  
Biological Input

Algal growth resulted in significant reductions in pH, electrical conductivity, exchangeable sodium and in hydraulic conductivity and aggregation status of the soil. There was a significant increase in the total nitrogen content of the soil due to algal growth. Two out of the three inoculated species of algae could establish in the pots along with the indigenous algal flora. Combination of gypsum and algal application were found to have appreciable reclamative properties, and the possibility of using algae as a biological input for the reclamation of sodic soils has been indicated.

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