持续干旱下天山野生杏幼苗渗透调节物质的累积特性

以新疆伊犁地区的4类野生杏(野生甜仁杏1号、野生甜仁杏2号,野生苦仁杏1号、野生苦仁杏2号)为材料,研究其在干旱胁迫下渗透调节物质的积累特性.对二年生天山野杏苗进行持续80 d的田间自然干旱处理过程中,每隔20 d取样分析土壤相对含水量(SRWC)及叶片相对含水量(LRWC),Na+,K+和可溶性蛋白质、可溶性糖以及脯...     

Characterization of Promising Apricot (<Emphasis Type="Italic">Prunus armeniaca</Emphasis> L.) Genetic Resources in Malatya,Turkey

The study here was conducted on nearly 12,000 apricot seedlings in the Malatya Region in the Eastern part of Turkey. This region is famous for its horticulture based mainly on apricot production and the Country's highest apricot production originates from this region. The flower and fruit characteristics of all populations, which include apricot seedlings, in the region were evaluated. Based on their horticultural performances, 13 genotypes were selected, of which seven were considered as apricots served in dried form and six as in table consumption form. Among the selected genotypes, the fruit weight ranged between 28.5 and 71.19 g, soluble solids ranged between 12.7 and 26.5%, while the range in total acidity was between 0.35 and 1.80% and fruit development period was between 87 and 183 days. To determine the selected genotypes performance in a similar environment, they were grafted on to 4-year-old rootstocks. The results from these combinations showed that there was some decrease, especially in fruit size and soluble solids, in the genotypes performance when compared to the results of the initial observations. Some differences were also detected in taste, fruit shape, pit shape, fruit flesh firmness, skin and flesh colors. The dry fruit yield was determined as 22.50–28.36% for the selected dry apricot genotypes. The dry fruit yield of all seven genotypes considered for dry consumption were similar to ‘Hacıhaliloğlu’ and higher than ‘Canino’, which were evaluated as control cultivars.     

超高压技术结合气调包装保持冷藏带鱼品质

为探讨超高压结合气调包装对4℃冷藏带鱼品质的影响,该试验以超高压(290 MPa,6 min)前处理后4℃真空冷藏为对照,超高压(290 MPa,6 min)分别结合不同比例的气调包装体积分数为(60%CO2+40%N2、60%CO2+7%O2+33%N2、60%CO2+15%O2+25%N2、50%CO2+15%O2+35%N2)处理鲜带鱼并放置4℃冷藏。贮藏期间,以冷藏带鱼的感官评定(sensory evaluation,SE)、菌落总数(total plant count,TPC)、挥发性盐基氮(total volatile basic nitrogen,TVB-N)、硫代巴比妥酸(thiobarbituric acid,TBA)、肌动球蛋白溶出量(actomyosin content,AM)、肌动球蛋白的总巯基含量(total sulfhydryls content,TSH)为测定指标,研究不同气调包装对冷藏带鱼的保鲜效果。结果表明:通过菌落总数与TVB-N综合判定货架期可知,超高压处理鲜带鱼后真空贮藏仅延长冷藏带鱼货架期至11 d,超高压处理后气调贮藏各组:60%CO2+40%N2气调包装组可延长货架期至16d,60%CO2+7%O2+33%N2气调包装组可延长货架期至19d,60%CO2+15%O2+25%N2与50%CO2+15%O2+35%N2气调包装组可延长货架期至21d,是对照组货架期近2倍,说明超高压结合气调包装能有效抑制细菌总数增长和TVB-N产生。气调包装会加速超高压后带鱼肌动球蛋白和肌动球蛋白中总巯基含量的降低,且气调贮藏中高比例的O2对超高压处理后冷藏带鱼的脂肪氧化也有明显促进作用。因此综合考虑,超高压处理后结合60%CO2+7%O2+33%N2的气调包装在显著延长货架期的同时,仍可较好地保持冷藏带鱼原有鲜度。研究结果为冷藏带鱼的保鲜研究提供一定的理论参考。     

~(60)Coγ射线辐射对鲜兔肉品质影响的研究

本文叙述了γ射线对鲜兔肉品质的影响。试验测定了鲜兔肉辐照后各项品质指标,结果表明:1到60kGy的辐射剂量对鲜兔肉的基本化学组成和氨基酸的含量无明显影响,没有改变兔肉食品的营养结构。辐照后兔肉的挥发性盐基氮随着辐射剂量的增加而增高.与对照组比较有明显差异.但未超过规定的鲜兔肉标准(小于15mg/100g).γ射线对鲜兔肉的蛋白质分解和脂肪的氧化有一定作用,但作用程度很小,并且在适宜的辐照剂量范围内不能引起兔肉的变质。10kGy以上辐射剂量处理的鲜兔肉均出现不同程度的“异味”,并随着辐照剂量的增加而加重,但在低温下,“异味”随着贮藏时间的延长而减弱或消失。密封包装的鲜兔肉用10kGy剂量辐照后,在2±1℃条件下贮藏3个月以上仍属于次鲜兔肉等级。     

真空预冷技术在子芋冷藏保鲜上的应用研究

将真空预冷技术配合塑料薄膜袋包装应用于冷藏保鲜子芋的预处理，研究不同的真空预冷处理工艺条件对子芋冷藏保鲜效果的影响，筛选最佳真空预冷工艺条件，并将保鲜效果同普通冷藏相比较。结果表明：采用真空室的真空度650 Pa，真空预冷终温4℃，预冷时间30 min进行真空预冷处理，并配合塑料薄膜袋包装的冷藏子芋比一般冷藏保鲜效果明显更好。表现在：冷藏30 d，外观饱满不皱皮，好果率提高19.5个百分点，失重率减少15.51个百分点，呼吸曲线明显下移，呼吸高峰推迟10 d出现，峰值减少20.2％。总糖保存率提高23.5个百分点。     

三种紫色土上不同绿肥品种的生物量及养分差异

采用框栽法对不同绿肥品种的生物量和氮磷钾养分进行分析比较,初步筛选出旱坡地不同紫色土上适宜的绿肥品种。结果表明,在酸性紫色土上,黑麦草和毛叶苕子是鲜干草产量较高且养分积累量较多的绿肥品种;在碱性紫色土上,蚕豆和黑麦草是鲜干草产量较高且养分积累量较多的绿肥品种;在中性紫色土上,黑麦草和紫云英是鲜干草产量较高且养分积累量较多的绿肥品种。因此,酸性紫色土上适宜种植和翻压黑麦草和毛叶苕子,碱性紫色土上适宜种植和翻压蚕豆和黑麦草,中性紫色土上适宜种植和翻压黑麦草和紫云英。     

大葱生产用种量试验研究

经过2000～2001年两年试验,育苗面积66.7m2,每定植667m2大葱生产田,用种100g育出的葱苗数量少,满足不了定植需求;用种150～250g育出的葱苗质量高,数量充足,生产出的鲜葱质量和产量较高,是适宜用种量范围;用种300～450g育出的葱苗质量不高,达到壮苗标准的葱苗较少,种子浪费较多,生产出的鲜葱质量和产量较低,不宜提倡.     

缁峥蒲а芯抗ぷ?加强学风建设和职业

。(二)本规范由广大专家学者广泛讨论、共同参与制订,是高校师生及相关人员在学术活动中自律的准则。0黔西南民族师范高等专科学校学报Journal of Southwest Guizhou Teachers College for Nationalities99C01H122;1;HH122_1;000400010001000195共和地区旱作条件下13种牧草引种试验张维云,颜红波,纪亚君青海省海南州经管站,青海省畜牧兽医科学院草原所,青海省畜牧兽医科学院草原所 共和,81300     

川滇高原湖泊鱼类分布的聚类分析

对川滇高原湖泊鱼类的聚类分析表明,14个湖泊鱼类分布在种(亚种)级和属级均具有相似性。属级的相似性程度很低,但仍反映出它们在鱼类区系形成上的共同源流;种(亚种)级间的差异显著,反映了地理隔离和生态隔离对鱼类物种形成和分化过程中双重因素的严重影响。本文还对其相似性和差异性的形成因素作了分析。