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Biomedical subjects

P J Phillips

Publications and source records attributed to P J Phillips.

At least 19 recordsLinked to original sources
PubMed1992

Simulation of animal cell metabolism.

A simulation of hybridoma growth and antibody production has been developed. It is capable of simulating all major variables of interest (e.g., specific growth rate, cell yield, sugars and amino acids profile, and antibody yield). This simulation is the most complete reported to date including such factors as cell composition, media composition, substrate and product effects, osmolarity etc. The stimulation of a large range of experimental data for hybridomas illustrates that this simulation is a powerful tool in the rational assessment of factors influencing the growth and metabolism of hybridoma cells.

Animals↗
PubMed1991

An analysis of some batch and continuous kinetic data of specific monoclonal antibody production from hybridomas.

An analysis of batch and continuous kinetic data obtained from hybridoma cell cultures has been performed with particular reference to the existence of specific antibody production profiles. The results presented by several groups, including our own, have been studied. Our analysis suggests that different interpretations of the data can be made to those previously presented in the literature. In view of the significance of these profiles, particularly in terms of production strategies designed to maximise antibody production, we believe that more consideration needs to be given to accuracy in reporting of kinetic studies in the future.

Animals↗
PubMed1979

Ion cluster techniques in drug metabolism: an example of the use of mixtures of the [12C]:[14C] isotopic forms of the synthetic prostaglandin cloprostenol ('Estrumate') to facilitate metabolite identification.

The synthetic prostaglandin analogue cloprostenol has been prepared radiolabelled with 14C. The isotopic abundance of 14C at position C-15 was greater than 90% of the theoretical maximum. We have utilizted the high abundance of the 14C isotope for metabolism studies by preparing mixtures of [12C]:[14C]cloprostenol such that fragments detected by mass spectrometry contained characteristic isotope clusters analogous to those often obtained using stable isotopes.

Animals↗
PubMed1979

Nalidixic acid and lactic acidosis.

Nalidixic acid may cause severe acidosis and we report a fatal case of lactic acidosis assocaited with nalidixic acid therapy. Studies in normal volunteers showed drug related impairment of lactate metabolism. We question whether the drug should be used in patients who may accumulate the drug or be predisposed to lactic acidosis.

Acidosis↗
PubMed1979

The disposition of the synthetic prostaglandin analogue cloprostenol ('Estrumate') in the rat and marmoset.

1. Following subcutaneous administration of the synthetic prostaglandin analogue [14C]cloprostenol to the rat (200 micrograms/kg), the dose was quantitatively recovered from the excreta: 52% of the dose was present in the urine and 43% in faeces. After intravaginal administration (200 micrograms/kg) 42% of the dose was recovered from the excreta, equally divided between urine and faeces, and 40% (range 25--66%) of the dose was recovered from the site of application. The radiolabelled compounds present in faeces were eliminated initially via the bile. 2. The max. observed plasma concn. of total 14C in the rat was 84 ng equiv./ml at 30 min after subcutaneous administration of cloprostenol (200 micrograms/kg). A component which co-chromatographed with cloprostenol on t.l.c. was rapidly cleared from plasma with a half-life of 54 min. After intravaginal administration of cloprostenol (200 micrograms/kg), low and persistent plasma concn. of 14C were detected. 3. The metabolic fate of cloprostenol in the rat and marmoset has been studied with radiolabelled and non-labelled drug mixed such that fragments detected by mass spectrometry exhibited characteristic 12C:14C isotope clusters. Metabolites derived from cloprostenol contained these characteristic doublets. 4. In the rat cloprostenol is metabolized by beta-oxidation to tetranor-cloprostenol. Unchanged cloprostenol and a conjugate of tetranor-cloprostenol were minor urinary metabolites. In the rat biotransformation of cloprostenol in the cyclopentane ring occurred; the tetranor acid of 9-keto-cloprostenol was identified in urine. In the marmoset unchanged cloprostenol and dinor-cloprostenol were major urinary components.

Animals↗
PubMed1978

Compartmental shift of potassium--a result of sympathomimetic overdose.

A 17-year-old youth was admitted with a serum potassium concentration of 1.8 mmol/l after taking an overdose of pseudoephedrine and choline theophyllinate. Apart from tachycardia, tachypnoea and ankle clonus, examination was normal as was the initial electrocardiograph. The hypokalaemia resolved, but there was an overall positive potassium balance of only 13 mmol. This suggests that the sympathomimetics provoked a compartmental shift of potassium perhaps indirectly by inducing hyperglycaemia and hyperinsulinaemia, as well as directly. Other factors known to affect body potassium distribution were excluded. The fact that features commonly associated with hypokalaemia could not be demonstrated may be explained by a normal body potassium content. Severe hypokalaemia caused by a compartmental shift occurs with large doses of sympathomimetics as well as in periodic paralysis.

Adolescent↗
PubMed1978

Metformin associated lactic acidosis.

A case of lactic acidosis occurring in association with inappropriate and excessive metformin therapy and a high serum metformin concentration is described. In the other 23 cases of metformin associated lactic acidosis reported to December 1977, renal, cardiovascular and liver disease were common. Although metformin is less likely to cause lactic acidosis than phenformin, neither drug should be prescribed in the presence of renal, hepatic or cardiovascular disease.

Acidosis↗
PubMed1978

Urinary free corticosteroid excretion and renal function.

Theoretically urinary free corticosteroid excretion should be affected by renal function and this would make it a less sensitive index of hypercortisolaemia. In 28 consecutive urine samples there was a clear relationship (r = 0.83; P less than 0.001) over a range of creatinine clearances 0.3-200 ml/min. Although an allowance could be made for renal function this would not necessarily improve the discrimination of normal from abnormal. Until data comparing corrected to uncorrected urinary free corticosteroid excretion become available, we recommend a short dexamethasone test as the initial investigation in patients with suspected hypercortisolaemia and abnormal plasma creatinine concentrations.

Adrenal Cortex Hormones↗
PubMed1977

The anion gap.

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Aged↗