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- E Bramley, I J Lean, W J Fulkerson, M A Stevenson, A R Rabiee, N D Costa
- Journal of dairy science
- 2008

This cross-sectional survey examined the prevalence of ruminal acidosis and the effects of acidosis on the production of dairy cattle. Eight fresh cows, 3 primiparous and 5 multiparous (< 100 d in milk), were selected randomly from each of 100 dairy herds in 5 regions of Australia. Rumen fluid was obtained from each cow by rumenocentesis and a stomach tube,… (More)

- E. H. Alves, Newton C. A. da Costa
- Notre Dame Journal of Formal Logic
- 1977

- N D Costa, D E McDonald, R A Swan
- Australian veterinary journal
- 1993

Blood samples were collected from 40 emus (Dromaius novaehollandiae) of 4 different age groups ranging from 1 week to 14 months. Plasma values of glucose, cholesterol, uric acid, total protein, albumin, creatine kinase, aspartate amino transferase, alkaline phosphatase, calcium, phosphorus and magnesium were measured. Fourteen-month-old birds had lower… (More)

- Newton C. A. da Costa, V. S. Subrahmanian
- Artificial Intelligence in Medicine
- 1989

We describe Richardson's functor from the Diophantine equations and Diophantine problems into elementary real-valued functions and problems. We then derive a general undecidability and incompleteness result for elementary functions within ZFC set theory, and apply it to some problems in Hamiltonian mechanics and dynamical systems theory. Our examples deal… (More)

- Newton C. A. da Costa, Jean-Yves Béziau, Otávio A. S. Bueno
- Logic Journal of the IGPL
- 1995

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- Newton C. A. da Costa, V. S. Subrahmanian, Carlo Vago
- Math. Log. Q.
- 1991

- Irene F. Mikenberg, Newton C. A. da Costa, Rolando Chuaqui
- J. Symb. Log.
- 1986

- James J. Lu, Lawrence J. Henschen, V. S. Subrahmanian, Newton C. A. da Costa
- Automated Reasoning: Essays in Honor of Woody…
- 1991