Interaction of the synthetic chalcones (1b,1c) and their cyclic analogues (2b,2c) with bovine (BSA) and human serum albumin (HSA) as well as with rat liver mitochondria (RLM) was studied by fluorescence spectroscopy. ...Interaction of the synthetic chalcones (1b,1c) and their cyclic analogues (2b,2c) with bovine (BSA) and human serum albumin (HSA) as well as with rat liver mitochondria (RLM) was studied by fluorescence spectroscopy. The maxima of emission fluorescence spectra were changed only in the case of 2b and 2c during interaction with BSA, HSA as well as mitochondrial outer membrane showing a slight hypsochromic shift and decrease of fluorescence. Interaction of the methoxy-(1b,2b) and the dimethylamino-substituted (1c,2c) compounds with outer mitochondrial membrane were studied by fluorescence polarization. Fluorescence polarization of 1b in the presence of the two proteins and mitochondria was found to be unchanged. Under similar conditions (2b,1c,2c) showed continuously increasing fluorescence polarization signal during the 30 minute period of investigations. Since fluorescence polarization supposes that as a result of binding these substances to proteins and lipids. Compound 2c displayed a continuous increase of fluorescence polarization signal in the presence of proteins (BSA, HSA), yeast cytoplasm (YC) and mitochondria (YM and RLM). This compound displayed a significant cytotoxic effect. This pattern of interaction with proteins might be one of the contributing vectors of the observed cytotoxicity against several human carcinoma cell lines.展开更多
Fluorescence-based imaging has emerged as a powerful tool for detecting latent fingerprints(LFPs).However,existing fluorescent developers face challenges in differentiating friction ridges from backgrounds with intrac...Fluorescence-based imaging has emerged as a powerful tool for detecting latent fingerprints(LFPs).However,existing fluorescent developers face challenges in differentiating friction ridges from backgrounds with intractable fluorescence,and to date,post-processing techniques fail to effectively enhance poorly visualized fingerprints.Herein,trichromatic-emitting carbon dots(CDs)were synthesized via a one-step solvothermal method using dyes and ethylene glycol as precursors.Experimental and theoretical results revealed that the high photostability and photobleaching resistance of the synthesized CDs originated from the hydrogen-bond interactions between the carbonaceous matrix and dye-related functional groups and fragments,which served as the fluorophore of these Dye-CDs.By combining CDs with diatomite,the resulting composite powders demonstrated high sensitivity and selectivity in fluorescence visualization of both fresh and aging LFPs.Using a typical powdering method with Dye-CDs/diatomite stored for 30 days,levels 1–3 detailed features of LFPs deposited on various porous or non-porous substrates were identified with high contrast.The developed tunable multicolor post-processing technique,achieved by separating ridge patterns from background noise,ensured highresolution details and overcame the challenges of weakly developed fingerprints.Thus,the proposed dual-mode strategy provides a promising solution for practical fingerprint imaging.展开更多
The aim of this scientific research was to study the influence of various diets (ketogenic, low carb, mixed) on teeth and saliva structure of healthy individuals. The health condition of teeth and the influence of die...The aim of this scientific research was to study the influence of various diets (ketogenic, low carb, mixed) on teeth and saliva structure of healthy individuals. The health condition of teeth and the influence of diet (sweets, water intake) were investigated using the questionnaires which were statistically processed by descriptive and inductive statistics. Saliva was examined using synchronous fluorescent fingerprint (SFF) and atomic force microscopy (AFM). The statistical evaluation of answers of respondents using the questionnaires about intake of sweets in their diet showed significant influence of sugars on formation of tooth decay of diet. The intake of water (volume and frequency) did not show significant influence on formation of tooth decay. Endogenous fluorescence and surface structure of saliva differed in healthy subjects with different diet. The most organized surface structure showed low carb diet (without crystals). The least organized surface structure showed ketogenic diet with the big crystals (1 - 2 μm). Untraditional methods (SFF and AFM) enable the new, sensitive and quick analysis of the mixture of saliva. Saliva of individuals with low carb diet showed the most organized structure. Low content of sugar in diet is important possibility of the prevention before dental carries.展开更多
基金supported by the Austrian Science and Research Liaison Office(ASO)grant,the VEGA 1/0999/11 grant；the Faculty of Medicine Research Fund(PTE AOK-KA-2013/20),(University of Pécs).
文摘Interaction of the synthetic chalcones (1b,1c) and their cyclic analogues (2b,2c) with bovine (BSA) and human serum albumin (HSA) as well as with rat liver mitochondria (RLM) was studied by fluorescence spectroscopy. The maxima of emission fluorescence spectra were changed only in the case of 2b and 2c during interaction with BSA, HSA as well as mitochondrial outer membrane showing a slight hypsochromic shift and decrease of fluorescence. Interaction of the methoxy-(1b,2b) and the dimethylamino-substituted (1c,2c) compounds with outer mitochondrial membrane were studied by fluorescence polarization. Fluorescence polarization of 1b in the presence of the two proteins and mitochondria was found to be unchanged. Under similar conditions (2b,1c,2c) showed continuously increasing fluorescence polarization signal during the 30 minute period of investigations. Since fluorescence polarization supposes that as a result of binding these substances to proteins and lipids. Compound 2c displayed a continuous increase of fluorescence polarization signal in the presence of proteins (BSA, HSA), yeast cytoplasm (YC) and mitochondria (YM and RLM). This compound displayed a significant cytotoxic effect. This pattern of interaction with proteins might be one of the contributing vectors of the observed cytotoxicity against several human carcinoma cell lines.
基金supported by the Key Laboratory of Impression Evidence Examination and Identification Technology,Criminal Investigation Police University of China,Ministry of Public Security,People’s Republic of China(No.2018HJKF12)the Natural Science Foundation of Liaoning Province(No.2023-BS-081)the Foundation of Education Department of Liaoning Province(Nos.LJKMZ20221366 and LJKQZ20222296).
文摘Fluorescence-based imaging has emerged as a powerful tool for detecting latent fingerprints(LFPs).However,existing fluorescent developers face challenges in differentiating friction ridges from backgrounds with intractable fluorescence,and to date,post-processing techniques fail to effectively enhance poorly visualized fingerprints.Herein,trichromatic-emitting carbon dots(CDs)were synthesized via a one-step solvothermal method using dyes and ethylene glycol as precursors.Experimental and theoretical results revealed that the high photostability and photobleaching resistance of the synthesized CDs originated from the hydrogen-bond interactions between the carbonaceous matrix and dye-related functional groups and fragments,which served as the fluorophore of these Dye-CDs.By combining CDs with diatomite,the resulting composite powders demonstrated high sensitivity and selectivity in fluorescence visualization of both fresh and aging LFPs.Using a typical powdering method with Dye-CDs/diatomite stored for 30 days,levels 1–3 detailed features of LFPs deposited on various porous or non-porous substrates were identified with high contrast.The developed tunable multicolor post-processing technique,achieved by separating ridge patterns from background noise,ensured highresolution details and overcame the challenges of weakly developed fingerprints.Thus,the proposed dual-mode strategy provides a promising solution for practical fingerprint imaging.
基金supported by the ERDF EU grant under contract No.ITMS26220120047 and VEGA-1/0409/15.
文摘The aim of this scientific research was to study the influence of various diets (ketogenic, low carb, mixed) on teeth and saliva structure of healthy individuals. The health condition of teeth and the influence of diet (sweets, water intake) were investigated using the questionnaires which were statistically processed by descriptive and inductive statistics. Saliva was examined using synchronous fluorescent fingerprint (SFF) and atomic force microscopy (AFM). The statistical evaluation of answers of respondents using the questionnaires about intake of sweets in their diet showed significant influence of sugars on formation of tooth decay of diet. The intake of water (volume and frequency) did not show significant influence on formation of tooth decay. Endogenous fluorescence and surface structure of saliva differed in healthy subjects with different diet. The most organized surface structure showed low carb diet (without crystals). The least organized surface structure showed ketogenic diet with the big crystals (1 - 2 μm). Untraditional methods (SFF and AFM) enable the new, sensitive and quick analysis of the mixture of saliva. Saliva of individuals with low carb diet showed the most organized structure. Low content of sugar in diet is important possibility of the prevention before dental carries.
