Assessment of Natural Radioactivity in Cements Used as Building Materials in Poland.

It has been analyzed in this article the radioactivity concentrations of Ra, Th, K and radiological hazard parameters in different types of cements commonly used in Poland and available on the Polish market. The radiological hazard parameters are, in particular, absorbed gamma dose rate, annual effective dose, radium equivalent activity, the external hazard index, and the gamma and alpha indices. The radionuclide activities of the most important radionuclides Ra, Th, K have been determined by gamma-ray spectrometry with the use of two kinds of spectrometers of different operational parameters.

Assessment of the Natural Radioactivity of Polish and Foreign Granites Used for Road and Lapidary Constructions in Poland.

The measurements of the specific activity of natural radioactive isotopes of radium (Ra), thorium (Th) and potassium (K) in chosen samples of imported (China, Finland, Spain, India, Sweden) and Polish (Izerski, Karkonosze, Siedlimowicki, Strzegomski, Strzelinski) granites were performed. The measurements were carried out with 2 × 2" NaI(Tl) scintillation detector. The measured specific activity on natural radioactive isotopes were within the following ranges: 5.

A subchronic application period of glucocorticoids leads to rat cognitive dysfunction whereas physostigmine induces a mild neuroprotection.

The cholinergic neurotransmitter system and prolonged glucocorticoid-induced stress can affect cognitive functions in opposite ways. While pharmacological enhancement of cholinergic neurotransmission is known to induce neuroprotective effects, chronic glucocorticoids impair cognitive functions. Up to now, there is no consensus as to whether a subchronic stress period of several days would affect cognitive function.

Finasteride treatment inhibits adult hippocampal neurogenesis in male mice.

Introduction: The 5-alpha-reductase inhibitor finasteride is used for the treatment of androgenic alopecia, benign prostate hyperplasia and prostate cancer. Besides inhibiting the conversion of testosterone to the biologically more active 5alpha-dihydrotestosterone, it also inhibits the production of neurosteroids. Decreased neurosteroid levels are postulated to be involved in the pathophysiology of psychiatric disorders such as depression.

Generalized phenomenological equation of plant growth.

Enlargement is one of the most fundamental activities of plants, and there are many simultaneous processes involved. Several could be temperature-dependent, like metabolic processes and cell wall sensitivity. A description of plant cell elongation was elaborated by Lockhart in the mid-60's of the last century in the form of time-dependent differential equation.