Preliminary Identification of Red Pigment and Positive Correlation between the Contents of Red Pigment and Total Saponins of Panax notoginseng Fruits

[Objective] This study aimed to identify red pigment of Panax notoginseng fruits and explore the correlation between pigment content and total saponins of the fruits. [Method] The red pigment of Panax notoginseng fruits was preliminarily identi- fied with specific color reactions and UV-vis spectra, and the contents of the pigment and total saponins were determined via spectrophotometry. [Result] The red hues of the fruits were contributed by anthocyanins and/or the anthocyanidins. The contents of anthocyanins and total saponins of the fruits both decreased along with thinning of the red hues. The content difference of the anthocyanins in fruits with different red hues reached extremely significant level, but that of total saponins just reached significant level. [Conclusion] The red pigment of P. notoginseng fruits is anthocyanins which are of extremely significant positive correlation with total saponins in contents.

Study on Chironomid Larvae Recognition Based on DWT and Improved KNN

A chironomid larvae images recognition method based on wavelet energy feature and improved KNN is developed. Wavelet decomposition and color information entropy are selected to construct vectors for KNN that is used to classify of the images. The distance function is modified according to the weight determined by the correlation degree between feature and class, which effectively improves classification accuracy. The result shows the mean accuracy of classification rate is up to 95.41% for freshwater plankton images, such as chironomid larvae, cyclops and harpacticoida.

Preparation of Cr_2O_3-based pigments with high NIR reflectance via thermal decomposition of CrOOH

In order to reduce greenhouse gas emission and urban heat island mitigation, pure and titanium（Ti）-doped Cr2O3 cool pigments were prepared via the thermal decomposition of CrOOH. The result reveals that the pure Cr2O3 pigment presents both a high near-infrared reflectance and excellent yellowish-green color. Meanwhile, titanium was doped to improve the NIR reflectance and strengthen the color. The color of the designed pigments was brighter, and most importantly, the NIR reflectance increased from 84.04% to 91.25% with increasing Ti content from 0 to 0.006% （mole fraction）. However, excessive doping of Ti4＋ for Cr3＋ in Cr2O3 （x（Ti）≥0.008%） decreased the NIR reflectance. One possible reason is that the conductivity type of the Cr2？xTixO3＋δ changed from p-type conduction to n-type conduction with increasing Ti content, accompanied by the change of the electrical resistivity and the NIR reflectance. The prepared yellowish-green Cr2O3 pigments have a great potential for extensive applications in construction and military.

罗志祥 红颜

NSNS编花编草的关系很复杂，真的！ 郎小宇和桃小花是好姐妹； 桃小花和朝小颜是“朝桃组合”（意思是一起招桃花）；

Effect of Nutrimental Stress on the Pigment Content of the Heliophytic Poinsettia （Euphorbia Pulcherrima cv. Valenciana）

Nutrimental requirements of heliophytic poinsettias have not yet been determined, this information is essential for developing an adequate technological package to orient producers in its management. The behavior of the plant under nutritional stress needs to be known by the application of a hydroponic system. The objective of the present work was to evaluate the physiological effect of induced deficiencies of five macronutriments （nitrogen, phosphorous, potassium, calcium, and magnesium） and its influence on the pigment production of the poinsettia Euphorbia puleherrima cv. ＂Valenciana＂. The study was made during 2010 at the Research Unit ＂Dr. Ramon Fernandez Gonzalez＂ in Texcoco, State of Mexico. Six treatments were tested during 240 days from transplant in a totally randomized experimental design. Chlorophylls contents were determined at the beginning of the experiment. At the end of the treatment period, the contents of nutrients, chlorophylls, leaf carotenoids and bract anthocyanins were determined. The effects observed as results of the treatments were： reduction in plant height and diameter; the lowest content of total chlorophylls was observed in the absence of nitrogen, the largest reduction being of chlorophyll a and carotenoids; a low content of anthocyanins was observed to be associated with low nitrogen and calcium; a high correlation was found between nitrogen supplementation and measured non-destructively with a SPAD 502 Minolta unit values measured intensity of green color of leaves.