Wyniki wyszukiwania

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Phosphate removal by crystallization in a pellet reactor

100%

Kryger-Styga H.

Zeszyty Naukowe Wyższej Szkoły Pedagogicznej w Bydgoszczy. Studia Przyrodnicze

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1994

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tom 11

2

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Primary structure of the connecting ring of ammonoids and its preservation

84%

Kulicki C., Tanabe K., Landman N. H.

Acta Palaeontologica Polonica

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2007

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tom 52

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nr 4

The most distinctive and important element of the hydrostatic organ of ammonoids and nautiloids is the siphuncular tube. It consists of mineral and organic segments (so−called connecting rings). The connecting ring of ammonites never preserves its original organic matter in the mineralized state, usually having undergone diagenetic phosphatisation, more rarely, calcification, or even complete loss. Our knowledge about its original ultrastructure is based upon comparison with Recent Nautilus and phosphatised or calcified ammonite fossils. We show that depending on the taphonomic history, both calcium phosphate and calcite can participate in the diagenesis of the connecting ring wall. Under standard light microscopy, the phosphatised elements are indistinguishable from the calcified ones. Both are dark brown in colour, due to an excess of carbon. The structure of the phosphatised siphuncle does not closely replicate the structure of its organic elements. This casts doubts on conclusions of other authors who described a complex porous structure in ammonite siphuncles, which is completely dissimilar to the siphuncular structure of Recent Nautilus and suggests that this organ functioned differently in ammonites. SEM observations using a BSE detector on the calcified parts of the walls of connecting rings revealed a multilayered structure with perpendicular elements connecting particular layers, resembling the structure of a stacked nacreous layer.

3

Morphological evaluation of bone defect regeneration after treatment with two different forms of bone substitution materials on the basis of bonitmatrix

84%

Kunert-Keil C., Gedrange T., Mai R., Spassov A., Lucke S., Klinke T., Kalukin J., Loster B. W., Gredes T.

Journal of Physiology and Pharmacology. Supplement

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2009

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tom 60

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nr 8

57-60

4

Effect of limestone meal or grit in laying hen diets on egg shell quality

84%

Koreleski J., Swiatkiewicz S.

Annals of Animal Science. Supplement

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2003

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nr 2

5

Assessment of viral and non-viral gene transfer into adult rat brains using HSV-1, calcium phosphate and PEI-based methods

67%

Corso T. D., Torres G., Goulah C., Roy I., Gambino A. S., Nayda J., Buckley T., Stachowiak E. K., Bergey E. J., Pudavar H., Dutta P., Bloom D. C., Bowers W. J., Stachowiak M. K.

Folia Morphologica

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2005

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tom 64

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nr 3

130-144

CNS gene transfer could provide new approaches to the modelling of neurodegenerative diseases and devising potential therapies. One such disorder is Parkinson’s disease (PD), in which dysfunction of several different metabolic processes has been implicated. Here we review the literature on gene transfer systems based on herpes simplex virus type 1 (HSV-1) and non-viral polyethyleneimine (PEI) and calcium phosphate nanoparticle methods. We also assess the usefulness of various CNS gene delivery methods and present some of our own data to exemplify such usefulness. Our data result from vectors stereotaxically introduced to the substantia nigra (SN) of adult rats and evaluated 1 week and/or 1 month post injection using histochemical methods to assess recombinant β-galactosidase enzyme activity. Gene transfer using PEI or calcium phosphate-mediated transfections was observed for both methods and PEI was comparable to that of HSV-1 amplicon. Our data show that the amplicon delivery was markedly increased when packaged with a helper virus and was similar to the expression profile achieved with a full-size replication-defective HSV-1 recombinant (8117/43). We also examine whether PEI or HSV-1 amplicon-mediated gene transfer could facilitate assessment of the biological effects induced by a dominant negative FGF receptor-1 mutant to model the reduced FGF signalling thought to occur in Parkinson’s disease.

6

Elektrodializa jonów fosforanowych w wodnych roztworach [zawiesinach] jedno- i dwuwodorofosforanów wapniowych i magnezowych

59%

Bartoszewicz J., Drabent Z.

Acta Academiae Agriculturae ac Technicae Olstenensis. Agricultura

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1993

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tom 56

81-91

W pracy zbadano zachowanie się jonów fosforanowych pochodzących z Ca(H2PO4)2, CaHPO4, Mg(H2PO4)2 i MgHPO4 w polu elektrycznym elektrodializatora. Na przemieszczenie takiej samej ilości jonów fosforanowych do komory anodowej elektrodializatora zużyto więcej energii dla fosforanów wapniowych niż magnezowych i więcej dla fosforanów jednowodorofosforanowych niż dwuwodorofosforanowych oraz odpowiednio więcej dla tych jonów wprowadzonych do Zerolitu FF niż dla takich samych jonów wprowadzonych w badanych solach do wody.

7

Rozpuszczalność fosforanów wapnia w biosferze gleby buraka

59%

Saive R.

Gazeta Cukrownicza

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1988

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tom 96

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nr 02