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Biomedical subjects

F Cabrera

Publications and source records attributed to F Cabrera.

At least 37 records · Page 2Linked to original sources
PubMed1998

Analysis of cations in drainage water and soil solution by single-column ion chromatography.

Single-column ion chromatography (SCIC) for cation determination in drainage water and soil solution was tested. Using a 100-microliter sample loop, the SCIC detection limits were 0.04 mg l-1 for Na+, 0.02 mg l-1 for NH4-N, 0.06 mg l-1 for K+, 0.05 mg l-1 for Mg2+, and 0.085 mg l-1 for Ca2+. Results were highly reproducible in wide ranges of concentrations. Results obtained by the SCIC method were compared with those by atomic emission spectrometry (Na+ and K+) and atomic absorption spectrometry (Mg2+ and Ca2+). Student's t-test and regression analysis showed that corresponding methods agree closely.

Calcium↗
PubMed1998

Analysis of inorganic anions in drainage water and soil solution by single-column ion chromatography.

Single-column ion chromatography (SCIC) for anion determination in drainage water and soil solution was tested. The SCIC minimum detection limits (100-microliter sample loop) were 0.75 mg l-1 for Cl-, 0.2 mg l-1 for NO2-N, 0.02 mg l-1 for NO3-N, 1.25 mg l-1 for HPO4-P, and 0.5 mg l-1 for SO4-S. The results showed a high reproducibility. Results for Cl-, NO3-N and SO4-S obtained by the SCIC method were compared with those obtained by traditional methods; Student's t-test and regression analysis showed that the methods agree closely.

Anions↗
PubMed1994

Previous ocular compression increases intraocular penetration of systemic drugs.

Intraocular drug penetration is dependent upon the physical and chemical characteristics of the drug, the manner of drug administration and the drug's ability to pass through the blood/aqueous barrier. Most systemically administered drugs do not achieve intraocular therapeutic levels. The authors present a new method to increase the intraocular concentration of intravenously administered drugs based on the premise that ocular hypotony by ocular compression produces a temporary break in the blood/aqueous barrier during the period of hypersecretion that follows to regain normal intraocular pressure levels. Vancomycin introduced parenterally was used as the drug model. The right eye of 22 rabbits served as experimental eye, while the left eye served as control. The concentrations of vancomycin in the aqueous humor half an hour after intravenous injection of 40 mg/kg vancomycin in 50 ml of lactated Ringer's solution were as follows: 30.17 +/- 20.68 micrograms/ml in the right (hypotonized) eyes and 4.92 +/- 3.33 micrograms/ml in the left (control) eyes. The difference in drug levels between the two sets of eyes had a high statistical significance at p = 0.001.

Animals↗