Fluorescence paper-based sensor for visual detection of carbamate pesticides in food based on CdTe quantum dot and nano ZnTPyP.

The needing of rapid and sensitive detection method for pesticides is increasing, to facilitate its detection without complicated instruments. Herein, a novel paper-based senor was developed for the visual detection of three carbamate pesticides (metolcarb, carbofuran, and carbaryl) based on CdTe quantum dots (QDs) and nano zinc 5, 10, 15, 20-tetra(4-pyridyl)-21H-23H-porphine (nano ZnTPyP) with a "turn-off-on" mode. This fluorescence sensing model could be applied in the highly selective and sensitive detection of carbamate pesticides both by fluorescence spectrometry or paper-based sensors. Based on the extracted RGB color values of paper, the partial least squares regression (PLSR) was used to accurately quantify the concentrations of carbamate pesticides in different food matrices (apple, cabbage and tea water). This method featured in high speed, low price and high accuracy, and provided a new strategy for the detection of food safety.

Clinical features and biological markers of lung cancer-associated stroke.

Objective To identify the unique clinical features and biological markers of lung cancer-associated stroke. Methods We recruited 102 patients with lung cancer plus stroke, 102 with lung cancer, and 102 with stroke. Detailed information was analysed and compared among groups. Results The groups were age-matched. Patients with lung cancer plus stroke showed multiple lesions involving multiple cerebral artery territories on magnetic resonance imaging, compared with stroke-alone patients. These patients also had a poorer modified Rankin Scale score at 30 days, and high mortality (18.6%). Patients with lung cancer plus stroke had a higher incidence of metastasis, and higher blood levels of D-dimer, CA125 and CA199 compared with patients with lung cancer alone. Multivariate logistic regression analysis showed that levels of D-dimer, CA125 and CA199 were independently related to lung cancer-associated stroke. Conclusion Elevated plasma D-dimer, CA125 and CA199 may be independent risk factors for and biomarkers of lung cancer-associated stroke.

Clinical features of systemic cancer patients with acute cerebral infarction and its underlying pathogenesis.

BACKGROUND: The increased incidence of cerebral infarction in patients with systemic cancer has been reported; however, the underline mechanisms remain unclear. Investigation regarding the clinical features of cerebral infarction in cancer patients could be helpful to understand its underlying pathogenesis. METHODS: A total of 537 patients were recruited and divided into three groups: 1) stroke and cancer group (SCG), defined as active cancer patients with acute cerebral infarction; 2) stroke group (SG), defined as acute cerebral infarction patients without cancer; and 3) Cancer group (CG), defined as active cancer patients without cerebral infarction. These patients were age and gender-matched among groups. RESULTS: 179 patients, including 128 male subjects (73.68%) were enrolled in each group. Compared to SG patients, more SCG patients lacked conventional vascular risk factors (CRFs), and had elevated plasma D-dimer, cancer antigen (CA) 125 and 199 levels with multiple lesions in multiple cerebral arterial territories. In addition, SCG patients were found to have poorer prognosis. Compared to CG patients, more SCG patients' cancer had metastasized. Multiple logistic regression analysis showed that the elevated plasma D-dimer, CA125 and CA199 levels may independently increase, but chemoradiotherapy decreased the risk of cerebral infarction in cancer patients. CONCLUSIONS: Our study demonstrated that the clinical features of acute cerebral infarction in most active cancer patients can be identified as multiple lesions in multiple cerebral arterial territories with elevated plasma D-dimer and the elevated levels of cancer antigens.