Andrew jackson also had a pipe , made from a corncob 安德鲁?杰克逊也有一个用玉米棒子芯制成的烟斗。
2.
Well , if the corncob fits . . 呃，要是想挨玉米棒子…
3.
Uncle jonathan ' s corncob pipe 乔安森的玉米穗管
4.
Well , if the corncob fits 呃，要是想挨玉米棒子
5.
Catalytic co - pyrolysis of corncob and low density polyethylene mixtures in hydrogen atmosphere 玉米芯与低密度聚乙烯混合物在氢气气氛下的催化热解研究
6.
Maize plants grow slower in early period because of low temperature , while grow rapidly in the mid and later periods when high temperature and rainy , especially after tasseling the development of grains , corncobs and husks need to accumulate a large amount of dry matter 玉米植株因低温而前期生长缓慢，生育中、后期高温多雨，生长迅速；特别是抽雄后，籽粒、玉米棒和苞皮发育需要积累大量干物质。
7.
The xylanase activity of the mutant kept stable after 10 generations . after orthogonal designing experiment , the optimum fermentation conditions of a . niger j 506 were obtained , which is as followed : concentration of the major carbon resource 4 % , ratio between bran and corncob 5 : 5 , concentration of glucose 0 . 1 % , concentration of ammonium oxalate as supplemental nitrogen resource 2 . 0 % , the initial ph of liquid medium 5 . 0 , 100ml / 250ml flask 经过正交试验设计，得出突变株a . nigerj506产木聚糖酶最佳的工艺条件为：主碳源浓度4 、麸皮与玉米芯的比例为5 ： 5 、辅加碳源葡萄糖的浓度是0 . 1 、辅加氮源草酸铵的浓度是2 . 0 ，培养基初始ph为5 . 0 ， 250ml三角瓶的装液量为100ml 。
8.
The recombinants were constructed by transforming ppic9 a - xynb into p . pastoris gs115 . the assay results revealed that the xylanase gene xynb was overexpressed and secreted effectually in p . pastoris . in 3l fermentor the expression level of xylanase xynba exceeded 1200iu / ml and the expressed xylanase had normal bioactivity . the molecule weight of xynba was determined as about 31kd which is higher than 23kd of original enzyme xynb from streptomyces olivaceoviridis a1 . xynbb was gotten by deglycasylation of xynba , whose molecule weight returned to 23kd . we comparised the enzymatic properties of xynba expressed in p . pastoris , xynbb deglycasylated from xynba and xynb produced from streptomyces olivaceoviridis al : there was little difference among the three enzymes on optimal ph , the optimal ph of xynb and xynba were both 5 . 2 , the optimal ph of xynbb was 5 . 0 ; the optimal temperature of xynb and xynba were both 60 c , while the optimal temperature of xynbb was 50 ? ; because of glycosylation the thermal stability of xynba was better than xynb and xynbb ; the specific activity of xynba and xynbb were 883 . 88iu / mg and 832 . 5hu / mg respectively , which were both lower than 2814 . 45iu / mg of xynb ; the km values of xynb and xynba were similar to each other which were 21 . 56 ( g / kg ) and 20 . 87 ( g / kg ) , while the km value of xynbb was 27 . 10 ( g / kg ) ; the fmax of xynba and xynbb were 4568umol / mg . min and 5329umol / mg . min respectively which were lower than 27623 umol / mg . min of xynb ; additionally all of the three enzymes did not display cellulase activity . they all had well resistance to pepsion and trypsin , and were not sensitive to metal iron , surface active agent and chelating agent . the analysis of different xylans enzymatic hydrolysate revealed : by xynba , that the main constitutions of enzymatic hydrolysate of birch wood xylans were xylotriose and xyloquaiose , which account for 68 . 43 % and 16 . 50 % respectively , additionally there was 11 . 79 % of xylobiose ; the main constitutions of enzymatic hydrolysate of corncobs xylans were xylobiose and xylotriose , which account for 81 . 78 % and 11 . 55 % . the result indicated that this xylanase was a kind of 1 , 4 - b - d - xylanohydrolase and was fit to used in industrial procession of xylooligosacc harides 进一步对xynba进行了脱糖基化处理得到xynbb ,其分子量恢复到23kd ，证明xynba是糖基化蛋白。通过对毕赤酵母重组表达的木聚糖酶xynba 、脱糖基化的木聚糖酶xynbb以及橄榄绿链霉菌a1所产原酶xynb之间酶学性质的比较发现：三种酶的最适ph差异不大， xynb和xynba均为5 . 2 ， xynbb为5 . 0 ； xynb和xynba的最适温度均为60 ， xynbb降为50 ：在耐热性上， xynba由于糖基化作用热稳定性明显高于未糖基化的xynb和xynbb ； xynba和xynbb的比活性分别为883 . 88iu mg和832 . 51iu mg ，明显低于原酶的比活2814 . 45iu mg ； xynb和xynba的km值相当，分别为21 . 56 ( g kg )和20 . 87 ( g kg ) ，而xynbb的km值较大为27 . 10 ( g kg ) ； xynba和xynbb的vmax相差不大，分别为4568 mol mg ? min和5329 mol mg ? min ，明显低于xynb的27623 mol mg ? min此外三种酶均无纤维素酶活性，对胃蛋白酶和胰蛋白酶有很好的抗性，且对作用环境中的各种离子、表面活性剂、螯合剂不敏感。通过对不同木聚糖的酶解产物的糖份分析发现：以桦木木聚糖为底物时，酶解产物主要为木三糖和木四糖，含量分别为68 . 43和16 . 50 ，另外还含有11 . 79的木二糖；以玉米芯木聚糖为底物时，酶解产物主要为木二糖和木三糖，含量分别为81 . 78和11 . 55 。
