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pro-long涂膜对采后贮藏荔枝果实色泽和酶活性变化的影响
张东林,陈芳,刘淑湘,李月标,蒋跃明,郭俊彦,PeterC.Quantick,PeterJWarren?
热带亚热带植物学报 , 1997, DOI: 10.3969/j.issn.1005-3395.1997.2.009
Abstract: 本文以荔枝品种“槐枝”为材料,以1.5%和2.5%pro-long涂膜处理果实,研究pro-long涂膜对果后贮于4℃的荔枝果皮色泽变化和有关酶活性的变化。对照和处理的hunterl值和b值均随贮藏时间的延长而降低,处理的比对照的下降慢。采后贮藏开始21d内,对照和处理的huntcra值变化很小,保持相对稳定,之后的贮藏时间内有较显著的下降,说明贮藏初期果实的红色特性变化较少,之后变化很明显,这与果皮花色素苷、类黄酮、总酚的变化是相对应的。在贮藏后期,处理的huntcra值下降明显较对照慢。hunter值的变化与在贮藏过程中果实外观逐渐变成暗红和揭变以及在果实的来后根变中起着重要作用的多酚氧化酶和部分地涉及褐变过程的过氧化物酶的变化相对应。处理的过氧化物酶活性增加较对照慢,而且,与对照比较,多酚氧化酶的峰值稍稍延迟了。未发现l‘5%和2.5%处理间有明显差别。因此,pro-long涂胶对荔枝的应用可以部分地降低多酚氧化酶和过氧化物酶,影响果皮花色素苷的降解、类黄酮和总酚的变化,延迟了褐变过程的发生。
EFFECTS OF PRO-LONG COATING ON CHANGES IN COLOUR AND ENZYME ACTIVITY OF POSTHARVEST LITCHI FRUIT
PRO-LONG涂膜对采后贮藏荔枝果实色泽和酶活性变化的影响

Zhang Donglin,Chen Fang,Liu Shuxian,Li Yuebiao,Jiang Yueming,Guo Junyan,Peter C Quantick,Peter J Warren,
张东林
,陈芳,刘淑湘,李月标,蒋跃明,郭俊彦,PeterC.Quantick,PeterJWarren

热带亚热带植物学报 , 1997,
Abstract: A common litchi cultivar Huaizhi was used to investigate how the application of Pro-long coating affects the browning of litchi peel and relevant enzymes during 4 t storage. The Hunter L and b values in both the control and treated fruits decreased continuously with storage time, indicating that the peel became darker and had less yellow characteristics. The Hunter L and b values in the control decreased faster than those in treated fruits. The Hunter a values ifl both the control and treated fruits were relatively stable during the first 20 days of storage and then significantly decreased during the remaining days, implying that stored litchi fruits maintained basically red characteristics during the first 20 days of storage and then became less red, corresponding to the changes in contents of anthocyanin, flavonoid and total phenolics. Hunter a values in the control decreased faster than those in treated fruits after the 21st day of storage. These correspond to a visible change to a dark red and brown during storage and changes in polyphenol oxidase (PPO) and peroxidase (POD), which indicate that polyphenol oxidase plays a definitive role in postharvest browning, and peroxidase is partially involved in the browning process. The increase in POD activities of treated fruits was slower than that of the control, and the peaks in PPO activities of treated fruits were delayed slightly compared to that of the control. There was no significant difference between 1.5% and 2.5% Pro-long treatments. Therefore, we suggest that the application of Pro-long coating to litchi fruits partially inhibits PPO and POD activities, and influences the breakdown of anthocyanin and the changes in contents of flavonoid and total phenolics, thereby delaying browning progress.
Mineralocorticoid Deficiency and Treatment in Congenital Adrenal Hyperplasia
Padidela Raja,Hindmarsh PeterC
International Journal of Pediatric Endocrinology , 2010, DOI: 10.1186/1687-9856-2010-656925
Abstract: Approximately 75%–80% of patients with Congenital Adrenal Hyperplasia (CAH) fail to synthesize sufficient mineralocorticoids to maintain salt and water balance. In most instances genotype can predict mineralocorticoid deficiency in CAH. Early recognition and replacement with 9-fludrocortisone and salt supplements will prevent development of potentially lethal salt losing crises. In infancy a relative state of aldosterone resistance exists and replacement dose of 9-fludrocortisone based on body surface area is higher during infancy compared to childhood and adults. Salt supplementation is generally not required after weaning is started. Regular monitoring of blood pressure and measurements of plasma electrolytes and renin are required to prevent complications of under or over dosage.
水雷冲击掩埋的一维--三维模型预测
PeterC.Chu
力学进展 , 2010, DOI: 10.6052/1000-0992-2010-6-lxjzJ2010-053
Abstract: 当圆柱体或非圆柱体海军水雷通过空气、水和沉积物下落时,水雷冲击掩埋状态预测模型建立了一段时间历程.模型的输出是预测水雷在空气和水柱中的运动轨迹、在沉积物中的掩埋深度和方向,以及雷体在掩埋物中凸出部分的高度、面积和体积.模型的输入包括环境、水雷特征和初始释放状态等参数.综述近30年来水雷冲击掩埋预测模型从一维到三维的发展情况(1)一维模型预测了在水雷降落角度恒定时的水雷质心的垂向位置;(2)二维模型预测了水雷质心在($x$,$z)$二维平面中的位置以及绕$y$轴的旋转情况;(3)三维模型预测了水雷质心在($x$,$y$,$z)$三维空间里的位置以及绕$x$,$y$和$z$轴的旋转情况.这些模型均通过从水雷冲击掩埋试验中获得的实验数据进行了验证.一维模型只求解了在沿$z$轴方向运动的一个动量方程,它不能很好地预测水雷的运动轨迹和掩埋深度.二维模型仅限于水雷在($x$,$z)$平面中的运动状态预测,而且要求雷体周围的流体是静止的,另外,使用了不准确的阻尼系数和不精确的沉积物动力学.因此,二维模型在水雷的运动轨迹和埋藏深度的预测上误差很大(比在Monterey湾砂底观察的深度大6$\sim$10倍).三维模型能很好地预测圆柱体、近圆柱体以及实验用的Manta和Rockan等水雷的运动轨迹和掩埋深度.
Repetitive Stimulation of the Pituitary with Growth-Hormone-Releasing Hormone Alters the Proportion of 22 and 20 Kilodalton Human-Growth Hormone Released
Webb EmmaA,Pringle PJane,Robinson IainCAF,Hindmarsh PeterC
International Journal of Pediatric Endocrinology , 2010, DOI: 10.1186/1687-9856-2010-781317
Abstract: Background/Aims. 20 Kilodalton-hGH (20 K-hGH) is the second most abundant pituitary GH variant after 22 K-hGH. In the steady state the proportion of 20 : 22 K-hGH appears constant; does this proportion change with repetitive somatotroph stimulation? Methods. Forty adult males were randomised to receive a GHRH(1–29) bolus ( or (, preceded or followed by a saline bolus, 1 week apart. Four to six weeks later, 10 subjects received GHRH(1–29) at 0, 60, 120, and 180 minutes. Clearance rate of 22 and 20 K-hGH was measured in 10 subjects. Results. Total amount/proportion of 22 K-hGH/20 K-hGH secreted was similar for both GHRH(1–29) doses. Repetitive stimulation reduced the amount of 22 K-hGH released whereas the amount of 20 K-hGH did not change significantly leading to an increase in the proportion of 20 K-hGH . Half-life of 20 and 22 K-hGH were not significantly different . Conclusions. Repetitive stimulation of the somatotroph may alter the proportion of GH variant released.
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