Wyniki wyszukiwania - Biblioteka Nauki

1

Ocena składu chemicznego wód podziemnych w kilku miejscowościach okolic Siedlec

100%

Kluska M. , Kroszczyński W. , Oprządek K.

|

2003

|

tom R.8, NR 1-2

53--57

PL

W latach 1992-1995 i 1999-2000 badano niektóre naturalne i antropogenne właściwości wód podziemnych w wybranych miejscowościach okolic Siedlec. Uzyskane wartości omówiono w porównaniu do odpowiednich norm.

EN

Some natural and anthropogenic properties of underground water in four selected localities in the neighbourhood of Siedlce have been investigated in the years 1992-1995 and 1999-2000. Obtained results were compared with the Polish National Standards.

2

Nie kończąca się historia witaminy D

100%

Kroszczyński W. , Morzycka B. , Morzycki J. W.

|

tom [Z] 56, 9-10

793-809

EN

The existence of vitamin D was discovered as a consequence of human disease. Vitamin D deficiency in childhood produces rickets, which is characterized by inadequate calcification of cartilage and bone. In rickets, the whole bony structure is soft and flexible, so that can hardly support the superposed weight of the body. Rickets was common in the 19th century, when the industrial revolution caused change of an agrarian society to an industrial society. The population in large measure spent much more time inside buildings, which shielded them from ultraviolet light. It was proved that sun light and cod liver oil are equally active in preventing and curing rickets. Further studies led to the discovery of an anti-rachitic vitamin D. A deficiency in vitamin D impairs bone formation in growing animals. The precursor of cholecalciferol (vitamin D3) is 7-dehydrocholesterol (provitamin D3) present in the skin. Irradiation of this compound results in the formation of previtamin D3, which spontaneously isomerizes to vitamin D3 (thermal rearrangement). Vitamin D3 is further converted by enzymatic hydroxylation reactions occurring in the liver and kidneys into an active hormone, which was isolated and identified as 1a,25-dihydroxyvitamin D3. Other biologically active metabolites and analogues of vitamin D were also described. The vitamin D endocrine system was primarily recognized for its critical role in calcium and phosphorus homeostasis. The active form of the vitamin, 1a,25-(OH) 2D3, acts on the intestine, bone, and kidney to increase serum levels of these two elements. Receptors for 1a,25-(OH) 2D3 have also been detected in a wide variety of target tissues and cell types, which are not involved in the calcemic activity. The non-classical actions of 1a,25-(OH) 2D3 have suggested a multitude of potential therapeutic applications of the vitamin D hormone for the treatment of hyperproliferative disorders (e.g. cancer and psoriasis), immune dysfunction and endocrine disorders. A number of new drugs based on the vitamin D analogues has been recently introduced to the pharmaceutical market. The story of vitamin D is not finished yet.

3

Assessment of pollution by heavy metals and polycyclic aromatic hydrocarbons of surface water in Kampinos National Park

88%

Oprządek K. , Syrocka K. , Kluska M. , Kroszczyński W. , Zalewski W.

|

2004

|

tom Vol. 30, no. 3

27--34

EN

Some natural and anthropogenic properties of surface water were investigated in National Park of Kampinos in years 2000-2002. Obtained results were compared with corresponding standards. Analyses of samples of water revealed most of them to be adequate to the 1 class of purity. Benzo(a)pyrene was not detected. However, in two cases high concentration of iron and manganese was observed. As a rule, the samples collected in November exhibited higher concentration of manganese. In one case high concentration of nitrates was determined. Most of samples collected in Aleksandrów met the requirement for the II class of purity because of phosphate concentration.

PL

W latach 2000-2002 badano niektóre naturalne i antropogenne właściwości wód powierzchniowych Kampinoskiego Parku Narodowego. Uzyskane wartości średnie omówiono w porównaniu do odpowiednich norm. Analizy większości próbek wykazały, że odpowiadają one I klasie czystości. Benzo(a)pirenu nie wykryto. Jednak w dwóch przypadkach zaobserwowano wysokie stężenie żelaza i manganu. Próbki pobrane w listopadzie zawierały więcej manganu. W jednym przypadku oznaczono wysokie stężenie azotanów. Większość próbek pobranych w Aleksandrowie odpowiadała 11 klasie czystości ze względu na zawartość fosforanów.