This paper deals with the influences of pH, acidity and ionic intensity of the solutions on the resonance Rayleigh scattering spectra and fluorescence spectra of humic acid. When the pH value is low and the acidity an...This paper deals with the influences of pH, acidity and ionic intensity of the solutions on the resonance Rayleigh scattering spectra and fluorescence spectra of humic acid. When the pH value is low and the acidity and ionic intensity are high, the resonance Rayleigh spectra and fluorescence spectra both show a tendency of increasing, though the former's intensity is much higher. In combination with the transmission electron microscope data, the factors leading to the occurrence and enhancement of the resonance Rayleigh scattering spectra of humic acid were explored. It is considered that particle enlargement caused by aggregation, the increase of heterogeneity, the increase of hydrophobility, the formation of interface, etc., are the factors leading to the occurrence and enhancement of the resonance Rayleigh scattering spectra of humic acid. As the intensity of the resonance Rayleigh scattering spectra of humic acid is much higher, resonance Rayleigh scattering spectroscopy can be used as a newly developed spectrum technology, which is more sensitive and simpler, to study humic acid and its complicated behaviors.展开更多
患者女,46岁,主因“咽部异物阻塞感2个月”于2017年12月9日就诊于昆明医科大学第一附属医院耳鼻咽喉科.患者自诉2个月前无诱因出现咽部异物阻塞感,进行性加重,2周以来伴有轻度吞咽受限,无咯血及呼吸困难等.纤维喉镜检查见右侧梨状窝及...患者女,46岁,主因“咽部异物阻塞感2个月”于2017年12月9日就诊于昆明医科大学第一附属医院耳鼻咽喉科.患者自诉2个月前无诱因出现咽部异物阻塞感,进行性加重,2周以来伴有轻度吞咽受限,无咯血及呼吸困难等.纤维喉镜检查见右侧梨状窝及会厌缘与杓状会厌襞淡红色肿物,表面光滑覆盖少许伪膜及分泌物(图1A).MRI扫描提示为右侧下咽及梨状窝处肿瘤(图1B);右侧颈部Ⅱb区一大小1.4 cm ×0.8 cm的肿大淋巴结.展开更多
基金supported jointly by the National Natural Science Foundation of China (No. 20475045)the Social Development Key Project of Guizhou Province [SY(2010)3035]the Frontier Project under the Knowledge-Innovation Program sponsored by the Institute of Geochemistry, Chinese Academy of Sciences (2006)
文摘This paper deals with the influences of pH, acidity and ionic intensity of the solutions on the resonance Rayleigh scattering spectra and fluorescence spectra of humic acid. When the pH value is low and the acidity and ionic intensity are high, the resonance Rayleigh spectra and fluorescence spectra both show a tendency of increasing, though the former's intensity is much higher. In combination with the transmission electron microscope data, the factors leading to the occurrence and enhancement of the resonance Rayleigh scattering spectra of humic acid were explored. It is considered that particle enlargement caused by aggregation, the increase of heterogeneity, the increase of hydrophobility, the formation of interface, etc., are the factors leading to the occurrence and enhancement of the resonance Rayleigh scattering spectra of humic acid. As the intensity of the resonance Rayleigh scattering spectra of humic acid is much higher, resonance Rayleigh scattering spectroscopy can be used as a newly developed spectrum technology, which is more sensitive and simpler, to study humic acid and its complicated behaviors.
文摘患者女,46岁,主因“咽部异物阻塞感2个月”于2017年12月9日就诊于昆明医科大学第一附属医院耳鼻咽喉科.患者自诉2个月前无诱因出现咽部异物阻塞感,进行性加重,2周以来伴有轻度吞咽受限,无咯血及呼吸困难等.纤维喉镜检查见右侧梨状窝及会厌缘与杓状会厌襞淡红色肿物,表面光滑覆盖少许伪膜及分泌物(图1A).MRI扫描提示为右侧下咽及梨状窝处肿瘤(图1B);右侧颈部Ⅱb区一大小1.4 cm ×0.8 cm的肿大淋巴结.