Antioxidant capacities,phenolic compounds,carotenoids, and vitamin C contents of nectarine,peach, and plum cultivars from California   总被引：8，自引：0，他引：8  

Gil MI  Tomás-Barberán FA  Hess-Pierce B  Kader AA 《Journal of agricultural and food chemistry》2002,50(17):4976-4982

Genotypic variation in composition and antioxidant activity was evaluated using 25 cultivars, 5 each of white-flesh nectarines, yellow-flesh nectarines, white-flesh peaches, yellow-flesh peaches, and plums, at the ripe (ready-to-eat) stage. The ranges of total ascorbic acid (vitamin C) (in mg/100 g of fresh weight) were 5-14 (white-flesh nectarines), 6-8 (yellow-flesh nectarines), 6-9 (white-flesh peaches), 4-13 (yellow-flesh peaches), and 3-10 (plums). Total carotenoids concentrations (in microg/100 g of fresh weight) were 7-14 (white-flesh nectarines), 80-186 (yellow-flesh nectarines), 7-20 (white-flesh peaches), 71-210 (yellow-flesh peaches), and 70-260 (plums). Total phenolics (in mg/100 g of fresh weight) were 14-102 (white-flesh nectarines), 18-54 (yellow-flesh nectarines), 28-111 (white-flesh peaches), 21-61 (yellow-flesh peaches), and 42-109 (plums). The contributions of phenolic compounds to antioxidant activity were much greater than those of vitamin C and carotenoids. There was a strong correlation (0.93-0.96) between total phenolics and antioxidant activity of nectarines, peaches, and plums.  相似文献   

Temperature, Osmotic Pressure and Seed Treatments Influence Imbibition Rates in Sorghum Seeds   总被引：1，自引：1，他引：0  

M. A. Kader  S. C. Jutzi 《Journal of Agronomy and Crop Science》2002,188(4):286-290

Imbibition is an essential part of the germination process and is affected by various environmental factors. The effects of temperature, seed treatment, storage and osmotic pressure on primed and untreated sorghum seed were examined. The potential influence of NaCl‐based seed‐soaking treatments was also investigated. Experiments on sorghum seeds showed that imbibition rates were higher in untreated than in primed seeds after more than 24 h of soaking and that a rise in priming temperature increased imbibition to a greater extent in the former. The influence of imbibition in regulating the seed response to priming, heat and osmotic stress is discussed.  相似文献   

QUANTITATIVE ULTRASONIC ASSESSMENT OF LIVER SIZE IN THE DOG     

Cynthia P.  Godshalk  DVM  Robert R.  Badertscher II  DVM  PhD  Marian K.  Rippy  DVM  Arthur W.  Ghent  PhD 《Veterinary radiology & ultrasound》1988,29(4):162-167

Static and real-time B-mode hepatic ultrasound imaging was performed on 16 anesthetized dogs (7.7–29 kg). Sagittal static B-mode scans were acquired at 1–cm intervals, and transverse scans were made with both static and real-time units. Measurements were made from the surface of the liver to the diaphragm and were tested individually and when added or multiplied together for significant correlation with liver and body weight. Only one of the static B-mode measurements had a significant correlation ( p >0.05), and none of the real-time measurements was dependent on liver weight. Ultrasonographic assessment of canine liver size using these methods was of little value in predicting actual liver weight.  相似文献   

香梨果萼黑斑病菌Alternaria alternata遗传转化体系的建立及GFP标记菌株的获得     

宋博  张丽娟  朱晓锋  徐兵强  艾米都拉·克尤木  阿布都克尤木·卡德尔  杨森 《植物病理学报》2022,52(1):97-103

 为建立香梨果萼黑斑病菌链格孢(Alternaria alternata)的原生质体遗传转化体系,本实验以香梨果萼黑斑病菌强致病性菌株LI1为供试材料,研究菌龄、酶系统、酶解时间等对链格孢菌原生质体制备的影响。链格孢菌菌丝在CM液体培养基中培养20 h,以0.7 mol·L^-1 NaCl为稳渗剂,1%裂解酶+1%崩溃酶+1%蜗牛酶的酶液组合下,28 ℃酶解4 h,原生质体制备效率最高。通过PEG/CaCl₂介导法将含有潮霉素B抗性基因和绿色荧光蛋白基因的质粒转入链格孢菌LI1,转化子生长表型及外源基因的PCR鉴定结果表明抗性基因已成功整合到香梨果萼黑斑病菌中。成功建立了香梨果萼黑斑病菌链格孢菌的原生质体遗传转化体系,并成功获得GFP标记菌株,为病原菌侵染定殖过程及致病机制研究奠定了基础。  相似文献   

Associations between the Exposure to Airborne Virulent Rhodococcus equi and the Incidence of R equi Pneumonia among Individual Foals     

Kyle R. Kuskie  Jacqueline L. Smith  Samiran Sinha  Craig N. Carter  Morgan K. Chaffin  Nathan M. Slovis  Stuart E. Brown II  Randolph S. Stepusin  Shinji Takai  Noah D. Cohen 《Journal of Equine Veterinary Science》2011,31(8):463-469

Rhodococcus equi is a significant cause of pneumonia, resulting in disease and sometimes death of foals. It is believed that infection occurs by inhalation of dust contaminated with virulent R equi. Although association between the airborne concentration of virulent R equi and the incidence of foal pneumonia at breeding farms has been documented, studies at the level of individual foals have not been reported. Thus, the objective of this study was to determine whether the magnitude of airborne virulent R equi was significantly associated with risk of R equi pneumonia for individual foals. The concentration of virulent R equi was significantly (P < .001) greater in stalls than paddocks among samples collected from 47 foals at a breeding farm in central Kentucky. The presence of airborne virulent R equi in stalls was significantly (P = .045) more likely at 7 days of age for foals subsequently found to be affected by rhodococcal pneumonia. Additionally, airborne concentrations of virulent R equi in stalls were significantly greater at 7 and 14 days of age than at birth. Presence of the mare and foal at the time of sampling was significantly (P < .001) associated with increased airborne concentrations of virulent R equi in stalls. These findings suggest that environments containing airborne virulent R equi during the first week of life may influence the risk of subsequent disease for a foal.  相似文献   

新疆鹅观草属3个种的核型     

孔祥祯  阿布来提  艾力  木克热木 《新疆农业大学学报》1993,(4)

本文首次报道了中国新疆地区鹅观草属3个种的核型。结果如下:宽叶鹅观草2n=4x=28=28m;屋尕鹅观草2n=4x=28=26m+2sm;长芒大穗鹅观草2n=4x=28=28m。它们均属于“1A”类型  相似文献   

低O ₂和高CO ₂对草莓采后酯类生物合成的作用模式     

周丽丽  DangyangKe  AdelAKader 《中国农业大学学报》1995,(2):180-186

草莓(Fragria ananassa Duck.cv.Chandler)果实于采收当天分别放在:①空气;②0.25%O_2;③21%O_2+50%CO_2;④0.25%O_2+50%CO_2(用 N_2平衡)四种流动气体条件(5℃)下1～7d,以研究气调贮藏对草莓的挥发性物质和发酵性酶活性的影响。在三种气调贮藏条件下,果肉中乙醛、乙醇、乙酸乙酯、丁酸乙酯的浓度较空气处理明显增加而乙酸异丙酯和乙酸丁酯的含量下降。气调贮藏处理增加了丙酮酸脱羧酶(PDC)和乙醇脱氢酶(ADH)的活性但略微减少了醇酰基转移酶(即酯化酶,AAT)的活性。低 O_2、高 CO_2条件下草莓中乙醇的大量累积加速了乙酸乙酯的生物合成。由于 AAT 活性的降低及过量的乙醇与其他醇类化合物对相同羧基化合物的竞争作用导致其他乙酸酯类产物的减少。  相似文献   

Identification of wild apple germplasm (Malus spp.) accessions with resistance to the postharvest decay pathogens Penicillium expansum and Colletotrichum acutatum     

Wayne M. Jurick II  Wojciech J. Janisiewicz  Robert A. Saftner  Ivana Vico  Verneta L. Gaskins  Eunhee Park  Philip L. Forsline  Gennaro Fazio  William S. Conway 《Plant Breeding》2011,130(4):481-486

  相似文献   

光果甘草和苦豆子硬实种子处理方法研究   总被引：1，自引：1，他引：0  

司马义·巴拉提  卡德尔·阿布都热西提 《种子》2011,30(3)

在不同处理条件下,对光果甘草(Glycyrrhiza glabra L.和苦豆子(Sophora alopecuroides L.)硬实种子处理效果进行了研究.结果表明:用水浸泡5 d的种子吸胀率很低,硬实率很高,用硫酸处理1～1.5 h减少硬实率、提高发芽率的效果最好,光果甘草和苦豆子种子发芽率分别可以提高到98%和100%,其次是赤霉素处理,磨损种皮处理效果为第三.  相似文献   

Effects of wind-driven rainfall on stemflow generation between codominant tree species with differing crown characteristics   总被引：1，自引：0，他引：1  

John T. Van Stan II  Courtney M. SiegertDelphis F. Levia Jr.  Carrie E. Scheick 《Agricultural and Forest Meteorology》2011,151(9):1277-1286

Meteorological influences on the variability of stemflow generation can affect the hydrology, ecology and soil chemistry of wooded ecosystems, yet the effects of directional wind-driven rainfall on differential stemflow production remain relatively un-researched. This study examines the correspondence of directional wind-driven inclined rainfall with stemflow generation in individual tree crowns utilizing multiple correspondence analysis (MCA) and intrastorm observations at 5 min monitoring intervals. In general, preferential stemflow generation at Fair Hill was observed during episodes of inclined rainfall driven by wind from the east to north-northeast (33.76-101.25°). This was supported by MCAs which produced significant correspondences between stemflow production and periods of inclined wind-driven rainfall for nearly all monitored storm events. Intrastorm plots of stemflow production from dominant and subcanopy trees of each codominant species (Fagus grandifolia Ehrh. (American beech) and Liriodendron tulipifera L. (yellow poplar)) also verified this correspondence. Interspecific canopy characteristics of L. tulipifera and F. grandifolia affected crown position, canopy structural characteristics, and, thus, the canopy's response to inclined precipitation. The greater vertical canopy depth observed for F. grandifolia trees enabled them to more efficiently capture inclined rainfall for enhanced stemflow production; whereas, the greater horizontal surface area of L. tulipifera canopies enhanced their droplet capture efficiency and subsequent stemflow generation for periods of un-inclined rainfall. As inclined wind-driven rainfall occurred within a majority of rain events at this site, preferential stemflow production may be a significant process to consider when examining the spatial distribution of canopy-derived water fluxes to the forest floor of wooded catchments under similar meteorological conditions.  相似文献