几种药剂对防治白及苗期锈病效果对比

通过对比试验,筛选出防治白及苗期锈病效果最佳的药剂。选用硫制剂敌锈纳、20%粉锈宁乳油、65%代森锌可湿性粉剂、70%甲基托布津可湿性粉剂作为防治药剂,设置4个处理,1个空白对照,试验结果表明:几种药剂均可不同程度的控制白及苗期锈病的发生,以硫制剂敌锈纳喷施防治白及苗期锈病效果最佳,其平均保存率达78.3%。     

The effects of carotenoids in quail breeder diets on egg yolk pigmentation and breeder performance

The effects of supplementation of 10?mg/kg (i) apoester, (ii) canthaxanthin, (iii) 3% clover extract, (iv) paprika oleoresin and (v) aztec marigold extract pigments to a wheat-based non-pigmented feed on hatchery performance and egg yolk pigmentation in quail breeders were investigated. At six weeks of age a total of 432 Japanese quail breeders were randomly divided into 6 treatments, each of which was replicated 3 times, with 24 birds (18 female:6 male) per replicate. Hatchability was significantly better in the apoester treatment compared to the control, canthaxanthin, clover extract and paprika oleoresin treatments (p?p?>?.05). Total carotenoids concentration, YCF score, yellowness (b*) and redness (a*) of egg yolk were significantly higher in pigment-supplemented treatments compared to the control treatment (p?a*) were highly correlated in all treatments (0.94; p?相似文献   

杉木不同优良品种早期生长对比试验

通过对2年生杉木不同优良品种对比试验林连续2 a的调查分析,结果表明,试验林1年生时的成活率和2年生时的保存率分别为94.38%和93.67%,优良品种适应性强且品种间差异极显著;试验林生长良好,1年生时平均树高为0.78m,2年生时达到1.98 m,当年平均抽高达到1.20 m,不同优良品种在树高性状上差异极显著;杉木优良品种适应性和早期速生性具有一致性。除了2号无性系和3号无性系表现较差外,其他杉木优良品种均表现良好。     

孝顺竹愈伤组织诱导及植株再生

利用孝顺竹小穗和种胚为外植体,诱导出胚性愈伤组织并成功实现植株再生.对影响愈伤组织诱导和分化的基本培养基、激素种类及质量浓度等进行筛选,结果表明:愈伤组织诱导以NB,N6基本培养基附加4 mg·L-1 2,4-D较好;外植体在NB+500 mg·L-1脯氨酸+500 mg·L-1谷氨酰胺+300 mg·L-1水解酪蛋白+30 g·L-1蔗塘+8 g·L-1卡拉胶(Carrageenan)+4 mg·L-1 2,4-D的诱导培养基上经20 d培养,小穗愈伤组织诱导率达87.30%,种胚愈伤组织诱导率为76.27%.愈伤组织预分化及分化的基本培养基以MS较适宜,经MS+30 g·L-1蔗糖+10 g·L-1卡拉胶+4 mg·L-1 KT培养基预分化7 d后,转入无激素的MS培养基上分化14 d,小穗愈伤组织仅个别长出绿色芽头;但种胚愈伤组织芽分化率可达80.0%.分化芽中有8%左右的白化苗,并伴有花叶苗出现.优化后的种胚愈伤组织预分化最佳培养基是MS+3 mg·L-1 6-BA+3 mg·L-1 KT.分化芽苗在添加2mg·L-1 NAA的MS培养基上生根良好,移栽成活率可达70%以上.     

Density and sound speed contrasts of the Japanese common squid Todarodes pacificus and their influence on acoustic target strength

ABSTRACT:   In this study, density and sound speed contrasts were measured for the Japanese common squid Todarodes pacificus . Target strength (TS) data derived from an acoustic scattering model based on measurements of these two parameters were compared with TS values based on acoustic measurement data to determine whether the measured parameters are reasonable values for theoretical scattering model. Density contrast ( g ) was measured from the displacement volume and wet weight, while sound speed contrast ( h ) was measured from the acoustic measurements of travel time (time-of-flight method). The Kirchhoff ray mode model, which represents the squid body as a set of fluid-filled cylinders, was used to calculate theoretical TS. Mean g- and h -values of the squid were 1.029 and 1.041, respectively. Comparison with previous data showed that g was similar, whereas h was relatively high. The difference in the TS between the theoretical model using measured parameters and the acoustic measurement was within 3 dB. Thus, the measured g- and h -values are acceptable for theoretical models of squid.     

两个牡丹杂交系种子胚培养技术研究

为保存和扩繁牡丹杂交系种质资源,提供牡丹组培苗的菌根化供试体系,本试验筛选牡丹杂交系‘Z1-10-3’和‘Z1-WM’的种子,取种胚进行胚培养,建立了牡丹胚培养无菌体系。结果表明：成熟种子经70%酒精2 min与0.1%HgCl 20 min表面消毒后去外种皮切开胚乳直接取胚接种,3 d时启动率达76.7%,比直接用种子和去外种皮的种子接种启动时间提前30～50 d。胚根苗直接培养的最佳培养基和培养条件为：1/2MS＋IBA 1.0 mg/L ＋AC 0.4 g/L＋Sugar 30 g/L,在自然弱光照下培养。     

Mathematical modelling of combined diffusion of heat and mass transfer through fabrics

This study presents a theoretical and experimental investigation of the process of drying of fabrics on a continuously moving flat plate. A mathematical model is developed for heat and mass transfer analysis of fabric in the impingement dryers. For simplicity, it is assumed that during the drying period of the fabric has porous media and on the drying surface the vapour pressure of the evaporating liquid remains at a quasi-saturated value corresponding to the temperature of the liquid. Using the model, the calculated transient fabric temperatures in the impingement dryers agree well with the experimental results.     

蜡蚧轮枝菌昆明菌株(KM9803)的生物学特性研究(二)——培养基种类、储藏条件对菌落生长、产孢量和孢子萌发率的影响*

 用7种培养基培养的结果,在麦芽汁培养基(MEA)上(23℃)得到最大产孢量(4.7×10⁹分生孢子/皿);用6种谷物的固体培养基试验中,大米粒培养基最适宜产孢,发酵培养10d得到最大产孢量1.5×10⁹分生孢子/g,孢子萌发率95.14% 。3种储藏条件试验的结果,以4℃冰箱中黑暗下6个月的孢子萌发率最高(91.47%)。     

葡萄离体培养及快速繁殖

取“无核白鸡心”“美人指”“甬优一号”等3个葡萄品种0．5cm长的单芽嫩茎作为外植体，接种于不同配方的培养基上。结果表明“无核白鸡心”“美人指”接种于GS分别附加6－BA1．0mg.L^-1和2．0mg.L^-1的培养基，“甬优一号”接种MS附加6－BA1．0mg.L^-1培养基诱导芽，芽的诱导率分别达100％，100％和86％。当芽伸长至1．0－1．5cm时，3个品种种均转接于MS‘附加IAA0．05mg.L^-1，6－BA1．0mg.L^-1和GA32．0mg.L^-1的分化培养基，芽的分化最佳，分化率达80％－865，增殖4．2倍左右，苗生长健壮。将“无核白鸡心”转入1／2MS附加IBA1．0mg.L^-1，“美人指”“甬优一号”转入1／2MS附加IBA2．0mg.L^-1的培养基，生根率达84％－96％，平均根数在5－7之间，根生长良好，表6参10     

屋顶绿化栽培基质的选择

屋顶绿化栽培基质的基本要求是容重轻 ,以减轻屋顶荷载 ,大小孔隙比合适 ,持水性和通气性协调。可以利用草炭、锯末屑、稻壳等有机基质与珍珠岩、蛭石等无机基质混配而成 ,还可适当添加一定的有机肥。