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P Marković

Publications and source records attributed to P Marković.

8 recordsLinked to original sources
PubMed1992

Calculating the calibration coefficient for radon measurements with the bare LR 115-II track detector.

Model calculations were performed to determine the calibration coefficient for radon measurements using a bare LR 115-II track detector. Calculations were based on an expression for stopping power for heavily charged particles, as well as on the Monte Carlo method. The sensitivity of the LR 115-II detector depends on equilibrium factor F, and it has been calculated for various values of F. For equilibrium factor F = 1, the calibration coefficient in this calculation was 89 m-1 (10.3 Bq d m-3 per tracks cm-2) for the removed layer, which was 5.5 microns thick.

Alpha Particles↗
PubMed1988

Influence of fasting and dopamine on the tissue catecholamines diurnal variations.

To define the role of catecholamines (CA) in the metabolic adaptation to fasting we examined the effect of exogenous dopamine(DA) on heat production(HP) and CA content in the interscapular brown adipose tissue(IBAT) and adrenals of control-fed and 2-day fasted rats in the morning(M) and in the evening(E). DA stimulates HP in fed rats in the M by 45% but the thermogenic effect of this CA is markedly higher in the E. However, DA had no thermogenic effect in fasted rats. The tissue CA in fed rats fluctuates diurnally: in the IBAT noradrenaline(NA) was much higher in the E while adrenaline(A) in adrenals was lower. DA in fed rats did not change the adrenal A but reduced NA content both in the adrenals and in the IBAT all over the day. Fasting depleted A from adrenals but increased NA content both in the M and in the E. Unlike the adrenals in the IBAT fasting did not affect NA content. In the adrenal gland of fasted rats DA significantly increased the A content to the equal degree during the day, while this CA had no effect on NA content of the IBAT.

Adaptation, Physiological↗
PubMedDate not supplied

[Diverticulum of the stomach].

Gastric diverticula are very rare and usually asymptomatic diseases. Clinical symptoms may include haemorrhage, mild discomfort and pain in upper abdomen. They are most frequently diagnosed incidentally during X-Ray examinations. In symptomatic diverticulum of gastric fundus was diagnosed roentgenographically and endoscopically and was successfully cured surgically.

Adult↗
PubMedDate not supplied

[Changes in intraocular pressure during dialysis].

We studied 29 patients on dialysis for terminal uremia, of whom one showed a dramatic rise in intraocular pressure (IOP) during dialysis. We examined the blood pressure (BP) and body weight (BW) before and after treatment in each patient and visual acuity by gonioscopic examination and optic disk status. After dialysis the statistically significant fall in BP and BW was observed in all patients, and in 28 subject an significant rise in IOP was noted. Only one patient experienced a dramatic rise in IOP, and he was the only one suffering from angular glaucoma during the last two years. All this time he was continually treated for glaucoma. After dialysis his IOP was 45 mmHg. With the adequate medication, his IOP lowered to the point when he was able to bear iridectomy which was done with argon and YAG laser. After the surgery his IOP reached the normal values. His visual acuity was good (1.0), visual field was normal, gonioscopic findings showed a narrow angle (Shaffer I, with normal pigmentation), and the optic disk had no abnormalities. It is not yet clear what was the cause of IOP rise during dialysis. It might be that the increased production of aqueous humor, which has been reported in such cases, might be caused by imbalance between blood and aqueous osmolality. If dialysis causes decrease in blood osmolality and if, at some time, blood becomes hypotonic in relation to ocular fluid, then the regular osmotic forces transfer the fluid to the ocular fluid into the eye. This case suggests that all patients on dialysis should undergo a minute ocular anamnesis and examination, and if needed administered adequate medication during the treatment.

Adult↗