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Biomedical subjects

H Sabelli

Publications and source records attributed to H Sabelli.

6 recordsLinked to original sources

Bios data analyzer.

The Bios Data Analyzer (BDA) is a set of computer programs (CD-ROM, in Sabelli et al., Bios. A Study of Creation, 2005) for new time series analyses that detects and measures creative phenomena, namely diversification, novelty, complexes, nonrandom complexity. We define a process as creative when its time series displays these properties. They are found in heartbeat interval series, the exemplar of bios .just as turbulence is the exemplar of chaos, in many other empirical series (galactic distributions, meteorological, economic and physiological series), in biotic series generated mathematically by the bipolar feedback, and in stochastic noise, but not in chaotic attractors. Differencing, consecutive recurrence and partial autocorrelation indicate nonrandom causation, thereby distinguishing chaos and bios from random and random walk. Embedding plots distinguish causal creative processes (e.g. bios) that include both simple and complex components of variation from stochastic processes (e.g. Brownian noise) that include only complex components, and from chaotic processes that decay from order to randomness as the number of dimensions is increased. Varying bin and dimensionality show that entropy measures symmetry and variety, and that complexity is associated with asymmetry. Trigonometric transformations measure coexisting opposites in time series and demonstrate bipolar, partial, and uncorrelated opposites in empirical processes and bios, supporting the hypothesis that bios is generated by bipolar feedback, a concept which is at variance with standard concepts of polar and complementary opposites.

Creativity↗

Sustained antidepressant effect of PEA replacement.

Phenylethylamine (PEA), an endogenous neuroamine, increases attention and activity in animals and has been shown to relieve depression in 60% of depressed patients. It has been proposed that PEA deficit may be the cause of a common form of depressive illness. Fourteen patients with major depressive episodes that responded to PEA treatment (10-60 mg orally per day, with 10 mg/day selegiline to prevent rapid PEA destruction) were reexamined 20 to 50 weeks later. The antidepressant response had been maintained in 12 patients. Effective dosage did not change with time. There were no apparent side effects. PEA produces sustained relief of depression in a significant number of patients, including some unresponsive to the standard treatments. PEA improves mood as rapidly as amphetamine but does not produce tolerance.

Adult↗

A high-pressure liquid chromatographic method for plasma phenylacetic acid, a putative marker for depressive disorders.

An HPLC procedure for the determination of total phenylacetic acid (PAA) in human plasma is described. After precipitation of plasma proteins with 0.4 N HClO4, the supernatant was hydrolyzed with 1.5 N HCl at 100 degrees C for 5 h, and PAA was extracted with benzene. From the organic layer PAA was back-extracted into 0.5 ml of 0.1 N NaOH. After neutralization with HCl the sample was directly injected onto the HPLC column (C18). An ultraviolet detector at 210 nm was used to monitor PAA. The plasma PAA values for a control population (536.18 +/- 54.99 ng/ml, N = 10) (X +/- SE) obtained by the described method are in agreement with values reported using GC/MS methods. Depressed subjects showed significantly lower values (327.64 +/- 45.44 ng/ml, N = 10), supporting the view that PAA may be a marker for depressive disorders.

Adolescent↗

Gas-liquid chromatographic determination of total phenylacetic acid in urine.

A gas-liquid chromatographic procedure to measure total phenylacetic acid in urine is described. The method is simple, rapid, and reliable. Normal subjects (N = 48) excreted 141.1 +/- 10.1 mg/24 h. Untreated depressed patients (N = 42) excreted 102.77 +/- 15.9 mg/24 h. The difference in the means is significant and supports the role of phenylacetic acid as a biological marker in certain kinds of mental illnesses.

Chromatography, Gas↗