生物信息学以及植物新基因的发现研究

新基因的发现对植物生命科学的研究及发展起着不可估量的作用,可以增强植物抗逆性、提高作物产量、改善经济植物品质等.然而,在发现植物新基因的方法中,生物信息学始终扮演着重要的角色.     

主成分分析法在长春市石头口门水库水环境质量评价中的应用

根据主成分分析法能够在保证原始数据信息损失最小的情况下,以少数的综合变量取代原有的多个变量的特点,对长春市石头口门水库汇水区的主要河流进行了水环境质量综合评价,并进一步对各个监测断面的水质优劣程度进行了排序.结果表明:该区水环境质量总体较差,以有机污染和农业非点源污染引起的水质污染为主.在空间分布上,石头口门断面水质相对较好,烟筒山断面和星星哨水库断面的水质次之,双阳河新安断面水质最差.     

不同施氮水平对黄瓜产量和品质的影响

研究了青紫塥粘田上施用氮肥对黄瓜产量和品质的影响.结果表明,在磷、钾肥底肥的基础上.施用氮肥具有显著增产作用,但施氮量在450 kg/hm2以上产量极显著降低.施用氮肥对黄瓜卫生标准没有明显影响,黄瓜硝酸盐舍量符合生食标准(<432 mg/kg).施氮水平对黄瓜的品质影响很大,VC含量,可溶性蛋白质在一定范围内有所提高,但随氮肥的进一步增加呈下降趋势,可溶性糖舍量在450～600 kg/hm2 范围内有所增高.综合考虑作物产量、品质、生产成本、人体健康等因素,在本试验条件下,黄瓜氮肥施用量为300 kg/hm2左右为宜.     

华东监测区营造林与人工林质量状况评价

选取了华东监测区近三年营造林综合核查和全国第六次森林资源连续清查的相关数据。对华东监测区八省（市）营造林质量主要指标进行了分析。运用SPSS软件对华东监测区营造林质量与人工林质量的有关指标进行了聚类分析。按照聚类分析结果对华东监测区八省（市）营造林质量、人工造林与人工林质量分成三种类型。     

那氏齐齐发诱导剂对桃果实的影响

以陇蜜9号桃和千年红油桃为供试材料,利用那氏齐齐发诱导剂800倍液在3月底树液流动后灌根,以2000倍液分别于6月初果实膨大期和果实成熟前1周叶面喷施.结果表明:那氏齐齐发诱导剂能够提早果实成熟,使果个显著增大、产量增加、提高果实的可溶性固形物含量,并能改善果实着色,提高果实品质.     

药剂结合低温贮藏对青花菜品质的影响

研究了0℃包装贮藏条件下,化学药剂处理对单花球青花菜品质的影响.研究结果表明,赤霉素(GA3)、苯甲酸钠(SBN)、6-苄基腺嘌呤(6-BA):均能延缓青花菜的品质下降,其中以40 mg/kg 6-BA+0.2%SBN处理的效果最好,在药后30 d时,叶绿素含量仅下降9.8%,未表现出黄化,失水率仅为2.25%,花球形态紧密充盈,保持了较好的商品性.     

Effect of radiation intensity on the outcome of postharvest UV-C treatments

Studies on the use of UV-C radiation of fresh produce have focused on the selection of appropriate doses (energy per unit area) for different commodities, but little attention has been placed on the effect of radiation intensity (dose per unit time). In this study, tomatoes (Solanum lycopersicum cv. Elpida) and strawberries (Fragaria × ananassa cv. Camarosa), were harvested (breaker and 100% of surface red color respectively) and treated with 4 kJ m⁻² of UV-C, at low (3 W m⁻²) or high (33 W m⁻²) radiation intensities. Untreated fruits were used as controls. After the treatments and at different storage times the incidence of postharvest rots and the changes in fruit physical and chemical properties were determined. UV-C treatments reduced decay, with the effects being were more marked in fruit exposed to high intensities. Mold counts were unaffected by the treatments, suggesting that improved disease control did not result from greater germicide effect. In both fruit species exposure to UV-C radiation delayed ripening, evidenced as lower color development, pigment accumulation and softening. UV-C-treated fruit maintained better quality than the control. In strawberry, high intensity treatments were more effective to prevent deterioration than in tomato where the differences between UV-C treatments were subtler. Soluble solids, titratable acidity and ethanol soluble antioxidants were not affected regardless of the UV-C intensity. Consumer tests showed higher preference of fruit treated at high UV-C intensity. Results show that in addition to the applied dose, radiation intensity is a main factor determining the effectiveness of UV-C treatments and should not be over-sighted. For a given dose, increasing radiation intensity may in some cases maximize the benefits of UV-C on fruit quality, while significantly reducing the treatments time.     

抗坏血酸钛对樱桃番茄产量和品质的影响

抗坏血酸钛在樱桃番茄上的试验于2006～2008年进行,发现对樱桃番茄叶面喷施抗坏血酸钛具有显著的提高产量和改善品质的作用。叶面喷施10～20 mg/kg的钛2次,对促进保护地、露地樱桃番茄早熟增产、优质及提高经济效益效果显著。抗坏血酸钛能促进樱桃番茄植株生理活性增强,提高过氧化氢酶活性,有利于樱桃番茄叶绿素含量增加和光合作用强度提高,果实中可溶性固形物和维生素C含量增加等。     

哈大高速公路沥青混凝土面层施工质量控制

对哈大高速公路沥青混凝土路面面层施工质量控制，对包括标准、材料试验和混合料组成设计、施工技术等几个方面进行了阐述，并对其质量进行了分析和评价。     

土壤特性对大麻纤维产量和品质的影响

通过对多处麻田的定点观测和取样测定 ,分析了栽培大麻的主要土壤类型和土壤条件 ,明确了影响大麻纤维产量和品质的主要土壤理化因素及相关程度。