棉花在不同整枝方式下生长发育规律的研究

在两年田间试验的基础上探讨了棉花整枝打顶和简化栽培措施下生长发育的区别。供试的两个棉花品种为中晚熟品种冀668和中早熟品种中棉30。结果表明,整枝打顶处理下的棉株的株高、主茎茎节、叶面积指数和蕾数都低于对照。然而脱落果节数的减少使得整枝打顶处理的有效铃数却增加了。整枝打顶处理总干物质量减少,但是生殖器官干物质量的比例却增加了。产量组成分析表明,整枝打顶处理的总铃数增加,单铃质量和衣分处理之间没有显著差别。两个品种在不同处理间的表现趋势一致,但是中熟品种比中早熟品种的趋势更明显。     

浅议文化造园

首先分析当前文化造园存在的一些问题,包括漠视园林文化和歪曲传统文化的现象,继而指出文化造园需要了解场地、尊重历史,其发展与丰富依赖于人与风景在时间长轴上的共同作用、不断积淀；最后以南宁孔庙植物景观和贵港龙蝠山庄假山的设计为例,简明阐释了在园林设计过程中如何结合实际、因地制宜,有效传承、发扬中国传统园林植物文化和山水文化.     

杉木人工林凋落量及气候因子敏感性分析

为研究凋落量、组成和动态变化及其与气候因子间的关系,对福建沙县杉木人工林进行了连续7 a的定位观测。结果表明,2005-2011年杉木凋落量变化范围为1 051.83-2 407.80 kg.hm-2,年平均值为1 493.14 kg.hm-2,凋落量2005-2006年显著降低(P<0.05),随后6 a间呈先增加再降低又增加的趋势,但变化幅度较为缓和。凋落物中落叶、落枝、落果、树皮及碎屑所占比例分别为62.9%、16.6%、7.63%、3.16%和9.73%。杉木凋落量季节动态总体表现为双峰型,峰值分别出现在2月(全年最大值)和7月,且2-7月凋落量占全年的62.3%,是杉木全年凋落量的主要贡献期。对凋落物的逐月观测数据与相应气象因子进行相关分析(Pearson和Spearman相关系数,n=84),结果显示,杉木凋落量对降水量和风速最为敏感(P<0.05),其次是气温和日照时间。     

柑橘矢尖蚧的发生为害及综合防治研究

柑橘矢尖蚧(Unaspis yanonensis Kuwana)是我国柑橘上为害最严重的介壳虫之一。严重发生时,不但可造成成片枝、叶干枯、树势衰弱,产量下降,甚至整株橘树死亡。果实受害后,果面分散或成片黏附虫体或造成黄绿斑点,果味变酸、品质大降。十堰市现有柑橘2万hm2,近年来柑橘矢尖蚧有逐年加重之势,局部橘园暴发成灾。为及时、有效地搞好该虫的预测预报和防治工作,我们于2003～2004年对其消长规律和综合防治对策进行了调查研究。1调查方法柑橘矢尖蚧发生情况观察选择在丹江六里坪柑橘园进行。每处固定调查20株,每株按高度分为上(距地面200cm以上)、…     

Effect of glycine on body weight and lipid metabolism in mice

AIM: To study the effect of glycine on body weight and lipid metabolism in mice. METHODS: Mice were randomly divided into four groups, control, high-fat diet group (HF), glycine group (Gly), and glycine treatment group (Gly+HF). The mice were fed with normal diet and high-fat diet for 12 days, respectively, and then were treated with glycine solution by intraperitoneal injection. Finally, the serum was collected to measure serum lipid, epididymal fat-pads, pararenal fat-pads and abdominal fat-pads were taken out to weight. Moreover, pathologic changes in liver were observed. RESULTS: The body weight of HF group was obviously lower than that in control; the body weight and adipose tissue content of Gly group were obviously lower than those in control; the body weight and adipose tissue content of Gly+HF group were obviously lower than those in HF group; the levels of TC and TG in Gly group were obviously lower than those in control; there was no statistical difference in serum lipid between Gly+HF and HF groups. In addition, marked hepatic steatosis in HF group, and slight hepatic steatosis in Gly+HF group were found. CONCLUSION: Gly can decrease the body weight and adipose tissue content and serum lipid in normal diet and high-fat diet mice, and it also can prevent hepatic steatosis.     

安哥拉山羊与建昌黑山羊及其杂种后代的DNA指纹分析

以 (CA/GATA/TCC) 5探针 ,HinfI酶切 ,研究安哥拉山羊和建昌黑山羊及安哥拉山羊与建昌黑山羊级进杂交的F2 、F3的DNA指纹图谱。结果 ,在供试山羊中 ,个体平均检出 1 8.2± 0 .4条谱带 ,安哥拉山羊、F2 、F3的鉴别机率分别为 1 .38× 1 0 - 12 ,1 .1 8× 1 0 - 13,0 .50× 1 0 - 10 ;群体内相似系数安哥拉山羊为0 .4 539,F2 为 0 .4 0 77,F3为 0 .61 1 1 ;亲子鉴定的父权概率W =0 .9889;安哥拉山羊与建昌黑山羊比较 ,2 .3kb和 8.6kb谱带为安哥拉山羊的特异谱带     

不同处理方法对美国截叶胡枝子种子发芽的影响

美国截叶胡枝子的硬实率很高,发芽率只有17.3%.经过种子预处理,如采用不同温度下浸种、98%浓硫酸浸泡、机械破皮和机械破皮结合热水浸种等处理,结果表明,机械破皮后用60℃热水浸种处理的效果最好,发芽势和发芽率分别达到64.0%和74.3%;其次是机械破皮,平均发芽率达到50%;浓硫酸浸种可以显著提高种子发芽势,浓硫酸浸种5min效果最好,发芽率达到44.7%;热水浸种的处理效果不佳,最好的90℃热水浸种处理发芽率也仅有26.7%.     

不同处理方法对美国截叶胡枝子种子发芽的影响

美国截叶胡枝子的硬实率很高,发芽率只有17.3%。经过种子预处理,如采用不同温度下浸种、98%浓硫酸浸泡、机械破皮和机械破皮结合热水浸种等处理,结果表明,机械破皮后用60℃热水浸种处理的效果最好,发芽势和发芽率分别达到64.0%和74.3%;其次是机械破皮,平均发芽率达到50%;浓硫酸浸种可以显著提高种子发芽势,浓硫酸浸种5min效果最好,发芽率达到44.7%;热水浸种的处理效果不佳,最好的90℃热水浸种处理发芽率也仅有26.7%。     

Influence of APP17 peptide on the learning,memory in SAMP10 mi ce and oxidative stress in mouse mitochondria in hippocampal neurons

AIM:To observe the influence of APP17-mer peptide on the learning and memory,and oxidative stress in mitochondria in hipp ocampal neurons of senescence accelerated mouse/prone 10 (SAMP10).METHODS:The 4-month-old SAMP 10s were randomly divided into mod el group and APP17-mer peptide group (the model group+APP17-mer peptide).The se nescence accelerated mouse/resistance1 (SAMR1) were used for normal control.The APP17-mer peptide group was injected with APP17-mer peptide subcutaneously in a dose of 0.34 μg/per mouse,three times a week;while the model group and the control group were injected with saline.After 28 weeks,water maze test was use d to evaluate the learning and memory of these mice.Then hydroxy lamine reactio n and thiobarbituric acid reaction were used to assay the activity of superoxid e dismutase (SOD) and contents of malondialdehyde (MDA) in mitochondria in hippo campal neurons,respectively.RESULTS:(1) The water maze test showed that the full-course swi mming time and numbers of error committed in model group were significantly incr eased as compared with the normal control (P<0.05).The results in APP17-me r peptide treated group were the same as that in normal control group.(2) Compa red with the normal control,the activity of SOD decreased in model group (P <0.01),and the contents of MDA increased (P<0.01).APP17-mer partially re versed the increase in MDA and the decrease in SOD.The content of MDA was lower and the activity of SOD was higher in APP17-mer peptide group than those in mod el group (P<0.05).CONCLUSION:The learning and memory deficit in SAMP10 are observ ed,and the balance of free radical generation/free radical scavenger is impai red.APP17-mer peptide has an antioxidant character and corrects the abnormal ch ange of SOD and MDA,which may be related to its protective effect of learning and memory.     

破伤风疫苗的研究进展

作者阐述了破伤风毒素的来源、危害、历史以及在预防破伤风方面的疫苗研制情况，破伤风类毒素制备工艺及其存在的不足，提出了亚单位疫苗、基因疫苗和基因工程疫苗等的优点和应用前景。