Diazepam and experimental tumour growth.
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Animals↗
Biomedical subjects
M Rocchetti
Publications and source records attributed to M Rocchetti.
NL-FIT: a microcomputer program for non-linear fitting.
A program for a microcomputer (HP 85) has been written using BASIC language. Given the analytical form of a model y: R leads to R the program computes the optimal parameters for non-linear least-squares fitting and gives information for its statistical evaluation. The program uses the Gauss-Newton algorithm with Marquardt's modification and other tricks. During the run a message is displayed if there is a high correlation between one or more couples of parameters to establish an interactive dialogue with the user on critical problems. The authors' aim was to make the program sufficiently quick and easy to use, efficient for a wide class of models and robust enough to deal with bad starting parameters.
Computers↗
SPBS: programs for non-parametric tests.
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Computers↗
CURT: a randomization test for statistical comparison between experimental curves.
In this paper, a new nonparametric method for testing the difference between two groups of time series is considered. A difference index between the two groups, based on the mathematical notion of norm, is introduced. Then, the statistical significance of the observed difference is assessed by means of a randomization procedure. The percentages of alpha and beta errors are evaluated by means of computer simulation. The method is also applied to a set of experimental data and the results are compared with those obtained by means of Student's t-test.
Animals↗
Differential response to immobilization stress of striatal dopaminergic and hippocampal noradrenergic systems in aged rats.
The effect of restraint stress on synthesis of central norepinephrine (NE) and dopamine (DA) was studied in adult and old rats. The rate of in vivo synthesis of the two catecholamines was determined in hippocampus (a prevalently noradrenergic area) and in striatum (a prevalently dopaminergic area) by measuring the accumulation of DOPA for 60 min after decarboxylase inhibition. NE synthesis was stimulated by stress in the first 30 min, after which the accumulation of DOPA declined. The stimulation was much greater in old rats. In striatum, endogenous DOPA concentration was significantly lower in old rats. Stress significantly enhanced DOPA accumulation in the first 30 min in both age groups but after this interval accumulation continued linearly only in young rats. These results indicate that in aged rats the response to stress of some noradrenergic and dopaminergic systems may be altered in opposite directions.
Aging↗