a split plots experiment based on randomized complete blocks design was carried out at field research center of islamic azad university, shoushtar branch during 2012 to find out the suitable sowing date and urea fertilizer used in chamomile (matricaria recutita). main plots including three sowing date (9, 19 and 29 february 2012) and subplots including four levels of urea fertilizers (5, 10, 15...

Urea nitrogen has been proposed to contribute significantly to nitrification by marine thaumarchaeotes. These inferences are based on distributions of thaumarchaeote urease genes rather than activity measurements. We found that ammonia oxidation rates were always higher than oxidation rates of urea-derived N in samples from coastal Georgia, USA (means ± SEM: 382 ± 35 versus 73 ± 24 nmol L-1  d-...


 Kedelai merupakan alternatif penggunaan enzim urease murni komersial dalam metode calcite precipitation. Ukuran butiran tepung kedelai salah satu faktor penting karena berpengaruh terhadap jumlah material yang tidak terlarut dan selanjutnya reaksi pembentukan kalsit. Tepung digunakan penelitian ini telah diayak dengan saringan No. 300 (50 μm), 150 (100 75 (200 μm) bagian tertahan di seti...

?????????????????????????????????????2 km???150 m?????????????????????????????????????????????????U–Pb???????????280 Ma???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

Homocitrulline arises from the reaction between cyanate and the epsilon-amino group of lysine residues; in milk, cyanate derives from heat-induced urea breakdown. Since homocitrulline levels were unknown in heated milk, its formation was studied in the temperature range 100-150 degrees C. Firstly, an analysis method based on ion-exchange chromatography using an amino acid analyser was developed...

A 72 year-old male with previous history of coronary heart disease, diabetes and gallbladder lithiasis, regularly medicated with low dose aspirin and oral anti-diabetics drugs, was admitted at the emergency room complaining of severe right upper abdominal quadrant pain and hematemesis. Physical examination: pallor, BP 110/70 mmHg, HR 90 bpm; tender and distended abdomen and normal cardiac-pulmo...

ABSTRACT: Sugarcane is a good source of renewable energy and helps reduce the emission greenhouse gases. Nitrogen has critical role in plant growth; therefore,estimating nitrogen levels essential, remote sensing can improve fertilizer management. This field study selects wavelengths from hyperspectral data on sugarcane canopy to generate models for estimating leaf concentrations. The was carrie...

The performance of the Paci¢c white shrimp Litopenaeus vannamei (Boone) under various stocking strategies was evaluated in earthen ponds ¢lled with freshwater amended with major ions. Six 0.1-ha earthen ponds located in Pine Blu¡, AR, USA, were ¢lled with freshwater in 2003 and 2004, and potassium magnesium sulphate added to provide 50mgK L 1 and stock salt added to provide 0.5 g L 1 salinity. ...

In the terminal part of the kidney collecting duct, rapid urea reabsorption is essential to maintaining medullary hypertonicity, allowing maximal urinary concentration to occur. This process is mediated by facilitated urea transporters on both apical and basolateral membranes. Our previous studies have identified three rat urea transporters involved in the urinary concentrating mechanism, UT1, ...