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Impact of Sewing Needle and Thread on the Technological Process of Sewing Knitwear

100%

Ujević D. , Rogale D. , Kartal M. , Brlobašić Šajatović B.

Fibres & Textiles in Eastern Europe

2008

tom Vol. 16, no. 4 (69)

85--89

The selection of sewing needles, the fineness of sewing thread, relative air humidity, as well as the thickness and density of knitted fabric play a significant role in the technological process of sewing. Damage to knitted fabric loops during sewing are closely connected with sewing needle penetration force and dynamic tension values of the sewing thread. In this research an instrument for measuring the sewing needle penetration force and dynamic sewing thread tension force was designed.

Wybór igły szyjącej, grubość zastosowanej nici, względna wilgotność powietrza, jak również grubość i gęstość szytej dzianiny odgrywają istotna rolę w technologicznym procesie szycia. Uszkodzenia oczek dzianin są ściśle związane z siłą penetracji igły i wartościami dynamicznych naprężeń nici. Dla realizacji badań wykonano specjalny przyrząd mierzący siłę penetracji igły i dynamiczne siły rozciągające występujące w nitce.

Quantification of daidzein, genistein and fatty acids in soybeans and soy sprouts, and some bioactivity studies

75%

Orhan I. , Ozcelik B. , Kartal M. , Aslan S. , Sener B. , Ozguven M.

Acta Biologica Cracoviensia. Series Botanica

2007

tom 49

nr 2

61-68

Effects of olive leaf polyphenols against H2O2 toxicity in insulin secreting β-cells

75%

Cumaoglu A. , Rackova L. , Stefek M. , Kartal M. , Maechler P. , Karasu C.

Acta Biochimica Polonica

2011

tom 58

nr 1

In pancreatic β-cells, although H2O2 is a metabolic signal for glucose stimulated insulin secretion, it may induce injury in the presence of increased oxidative stress (OS) as in the case of diabetic chronic hyperglycemia. Olea europea L. (olive) leaves contain polyphenolic compounds that may protect insulin-secreting cells against OS. The major polyphenolic compound in ethanolic olive leaf extract (OLE) is oleuropein (about 20 %), thus we compared the effects of OLE with the effects of standard oleuropein on INS-1 cells. The cells were incubated with increasing concentrations of OLE or oleuropein for 24 h followed by exposure to H2O2 (0.035 mM) for 45 min. H2O2 alone resulted in a significantly decreased viability (MTT assay), depressed glucose-stimulated insulin secretion, increased apoptotic and necrotic cell death (AO/EB staining), inhibited glutathione peroxidase activity (GPx) and stimulated catalase activity that were associated with increased intracellular generation of reactive oxygen species (ROS) (fluorescence DCF). OLE and oleuropein partly improved the viability, attenuated necrotic and apoptotic death, inhibited the ROS generation and improved insulin secretion in H2O2-exposed cells. The effects of oleuropein on insulin secretion were more pronounced than those of OLE, while OLE exerted a stronger anti-cytotoxic effect than oleuropein. Unlike OLE, oleuropein had no significant preserving effect on GPx; however, both compounds stimulated the activity of catalase in H2O2-exposed cells. These findings indicate different modulatory roles of polyphenolic constituents of olive leaves on redox homeostasis that may have a role in the maintenance of β-cell physiology against OS.