für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution 4.0 International License. Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschung in Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht: Creative Commons Namen...

Noncovalently bound fluorescent probes have been used to study changes in the platelet which may occur during platelet aggregation. Platelets were exposed to either N-phenyl-naphthylamine (NPN) or 8-anilino-1-naphthalene-sulfonic acid (ANS). Both dyes were bound by the platelet, and platelet aggregation by collagen or thrombin was unaffected by the presence of the label. No change in fluorescen...

We demonstrate the design and integration of droplet-based microfluidic devices with microoptical element arrays for enhanced detection of fluorescent signals. We show that the integration of microlenses and mirror surfaces in these devices results in an 8-fold increase in the fluorescence signal and in improved spatial resolution. Using an array of microlenses, massively parallel detection of ...

Abstract The aim of this study is to separate PET flakes by applying floatation technique, initially from binary polymer blends and later the mixture five common polymers such as polypropylene, polyethylene, poly(vinyl chloride), polstyrene poly(ethylene terephthalate). A connection line between fiber presumed in study, because dyeing recovered polyester with three disperse dyes followed. separ...

A new method based on partial filling micellar electrokinetic chromatography (MEKC) for the quantitative determination of Sudan dyes (I, II, III, and IV) in chilli sauces is presented. The separation is achieved filling 25% of the capillary with a MEKC buffer composed of 40 mM NH(4)HCO(3), 25 mM sodium dodecyl sulfate, and 32.5% (v/v) acetonitrile (ACN). The rest of the capillary is filled usin...

264 Substituted 1,3-indandione derivatives have shown a large applicability during the last three decades in the fields of medicine [1-5], biology [6,7] and agriculture [8]. There are many references related to the biological activity of some 2-substituted indan-1,3-dione derivatives such as their good anticoagulant [9], anti-inflammatory [10], analgezic [11], antibacterial [12] or bronchiadila...

A simple spectrophotometric method is described for resolving binary mixtures of some food dyes: Amaranth, Brilliant Blue, Sunset Yellow and Tartrazine, using the first-derivative spectra with measurements at zero-crossing wavelengths. Analytical curves are linear up to 20 mg L(-1). Standard deviations of 1.30, 2.22, 1.93 and 0.81% were obtained for synthetic binary mixtures of 2 mg L(-1) of Am...

Hair dyes have been evaluated as possibly being mutagenic and carcinogenic in animals. Studies of the association between human cancer risk and use of hair dyes have yielded inconsistent results. The authors evaluated the risk of lymphoid malignancies associated with personal use of hair dyes. The analysis included 2,302 incident cases of lymphoid neoplasms and 2,417 hospital- or population-bas...

PURPOSE Near-IR fluorescence imaging has great potential for noninvasive in vivo imaging of tumors. In this study, we show the preferential uptake and retention of two hepatamethine cyanine dyes, IR-783 and MHI-148, in tumor cells and tissues. EXPERIMENTAL DESIGN IR-783 and MHI-148 were investigated for their ability to accumulate in human cancer cells, tumor xenografts, and spontaneous mouse...