An investigation into the growth and production of the sharptooth catfish Clarias gariepinus (Burchell) was conducted over a period of 75 d in recirculating water, using three types of biofiltration ...systems. Yields fluctuating between 195.2 kg and 242.1 kg were obtained with the mean fish mass per m super(3) of water ranging between 19.5 and 22.5 kg. A biofilter system using PVC shavings was not only found to be the most efficient in the transformation of nitrogenous wastes, but also produced the highest growth and production of catfish as well as the best feed conversion ratio of the three biofiltration systems used.
The synthesis of 6β-bromopenicillanic acid labeled with deuterium and tritium in the β-methyl group is described. The S-sulfoxide of benzyl- or p-methoxybenzyl 6α-bromopenicillanate is refluxed in ...benzene containing an excess of tert-BuOD, D2O or HTO. After deoxygenation and deprotection of the ester, the labeled 6α-bromopenicillanic acid is epimerized (N, O-bis(trimethylsilyl)acetamide/1, 5-diazabicyclo4.3.0non-5-ene in CH2Cl2). The two epimerized are separated by column chromatography.
The effects of Staphylococcus aureus mastitis on milk yield and composition throughout subsequent lactation in lactating guinea-pigs and the role of endotoxin pretreatment on these phenomena were ...investigated. Primiparous lactating guinea-pigs were intramammarily inoculated with sterile saline (group 1), S. aureus strain UC 6097 (group 2), or with S. aureus UC 6097 after endotoxin pretreatment (group 3). Clinical signs and survival rate were monitored. During the second lactation, daily milk yield was measured and milk composition was determined. In primiparous inoculated guinea-pigs, moderate (group 3)-to-severe acute mastitis (group 2) was produced. During subsequent lactation, milk yield in the control group peaked on day 5 and then decreased. Concentrations of Na+ and Cl- in milk, and concentrations of fat, gradually increased, but lactose and K+ decreased. After an early decrease, NAGase in milk increased towards the end of lactation. Except for higher NAGase concentrations in group 3, milk yield and composition during the second lactation did not differ significantly between the mastitis and the control groups. Endotoxin pretreatment only plays a role in the determination of the severity of the infection.
Leadership and Catholic College Graduates Philip Roets, C. Ss. R.
The American Catholic Sociological Review,
03/1949, Letnik:
10, Številka:
1
Book Review, Journal Article
A liquid chromatographic method was developed for the separation of thymidine from its anomer and isomers. The method was implemented during a comparative stability study of thymidine and 1- ...(2-deoxy-α-D-erythro-pentofurano-syl)thymine.
Centennial of Rerum Novarum Danner, Peter L; Misner, Paul; Waterman, A.M.C. ...
Review of social economy,
01/1991, Letnik:
XLIX, Številka:
4
Journal Article
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