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101.
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4种植物水浸提液对乌丹蒿的化感作用研究 总被引:2,自引:0,他引:2
温都日呼;王铁娟;韩文娟;代亭亭 《植物研究》2013,33(1):86-90
分布于科尔沁沙地西部的固沙先锋植物乌丹蒿近些年呈现出衰退趋势。本研究选取了该地区3种主要飞播植物白沙蒿、柠条、羊柴以及乌丹蒿自身进行了化感作用的研究,结果表明:3种飞播植物及乌丹蒿自身的水浸提液对乌丹蒿的生长均有不同程度的化感作用,并且不同部位(根、叶、果皮或总苞片)中存在的化感物质的作用不同。主要表现为:乌丹蒿种子的萌发率在各供体的根浸提液中均下降,除羊柴外均达到显著,白沙蒿总苞片和羊柴果皮浸提液也有着同样的结果,而乌丹蒿叶浸提液则有一定的促进作用;4种植物不同部位的水浸提液对乌丹蒿种子发芽速度及幼根的生长均有显著的抑制作用。从综合效应来看,4种植物对乌丹蒿均有抑制作用,抑制作用由强到弱的顺序为:白沙蒿>柠条>乌丹蒿>羊柴。 相似文献
103.
目的:低温在许多小鼠心跳骤停后复苏模型的研究中被证实是有效的。心跳骤停后释放的氧自由基是产生继发性损伤的一个重要机制。本研究旨在探索心跳骤停期间应用中度低温对复苏后抗氧化物酶活性的影响。方法:用氯化钾诱导8min心跳骤停。此实验分为常温心跳骤停组(NCA)、低温心跳骤停组(HCA)TL对照组。HCA组在心跳骤停5min后开始降温使核心温度维持在(30.0±1.0)℃。应用胸部按压和肾上腺素来复苏。在心跳骤停两组各选择三个时间点:复苏后1h、4h和24h。测量超氧化物歧化酶(SOD)和过氧化氢酶(CAT)在心脏和肝脏的活性。结果:实验动物在HCA组比常NCA组生存率高。HCA组比NCA组复苏时间明显延长。与NCA组相比,HCA组复苏后24h的SOD活性在肝脏表达明显降低。与NCA组相比,HCA组复苏后4h的CAT活性在肝脏表达显著增高。结论:在心跳骤停过程中,与正常体温相比,应用中度低温能够提高生存率。与正常体温相比较,在心跳骤停中期间应用中度低温不影响心脏的SOD与CAT活性,应用中度低温在肝脏可延迟性抑制SOD的活性并且短暂提高CAT活性。 相似文献
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UDP-N-acetylglucosamine pyrophosphorylases (UAP) function in the formation of extracellular matrix by producing N-acetylglucosamine (GlcNAc) residues needed for chitin biosynthesis and protein glycosylation. Herein, we report two UAP cDNA’s derived from two different genes (LmUAP1 and LmUAP2) in the migratory locust Locusta migratoria. Both the cDNA and their deduced amino acid sequences showed about 70% identities between the two genes. Phylogenetic analysis suggests that LmUAP1 and LmUAP2 derive from a relatively recent gene duplication event. Both LmUAP1 and LmUAP2 were widely expressed in all the major tissues besides chitin-containing tissues. However, the two genes exhibited different developmental expression patterns. High expression of LmUAP1 was detected during early embryogenesis, then decreased greatly, and slowly increased before egg hatch. During nymphal development, the highest expression of LmUAP1 appeared just after molting but declined in each inter-molting period and then increased before molting to the next stage, whereas LmUAP2 was more consistently expressed throughout all these stages. When the early second- and fifth-instar nymphs (1-day-old) were injected with LmUAP1 double-stranded RNA (dsRNA), 100% mortality was observed 2 days after the injection. When the middle second- and fifth-instar nymphs (3- to 4-day-old) were injected with LmUAP1 dsRNA, 100% mortality was observed during their next molting process. In contrast, when the insects at the same stages were injected with LmUAP2 dsRNA, these insects were able to develop normally and molt to the next stage successfully. It is presumed that the lethality caused by RNAi of LmUAP1 is due to reduced chitin biosynthesis of the integument and midgut, whereas LmUAP2 is not essential for locust development at least in nymph stage. This study is expected to help better understand different functions of UAP1 and UAP2 in the locust and other insect species. 相似文献
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106.
莫莫格自然保护区白鹤秋季迁徙停歇期觅食生境选择 总被引:1,自引:0,他引:1
2008年秋季(10月8日—20日)及2009年秋季(9月20日—10月16日),通过样方法对觅食生境11个生态因子进行调查,利用卡方检验、资源选择指数和资源选择函数在莫莫格保护区对秋季迁徙停歇期白鹤觅食生境选择进行研究。结果表明,白鹤对距人为干扰源距离、植被密度、盖度、高度、植物性食物密度以及水深均具有选择性,但对宏观尺度干扰因子的选择性较低。其偏好觅食生境的特点为:距一级路>5000m,>二级路1500m以上,>三级路1000m以上,>居民点1000m以上,农田>1000m;植被密度20~50株/m2,盖度<10%,高度<20cm,扁杆藨草密度1~50株/m2,藨草密度1~10株/m2,水深40~60cm。白鹤秋季觅食生境资源选择函数为Logistic(P)=0.663+0.565×与一级道路距离+0.042×与二级道路距离+0.519×与三级道路距离+0.353×与居民点距离+0.169×与农田距离–0.455×植被密度–0.618×植被盖度–0.548×植被高度–0.158×扁杆藨草密度–0.404×藨草密度+0.920×水深,T(x)=eLogistic(p)/[1+eLogistic(p)],模型正确预测率为82.9%。 相似文献
107.
Background
Many studies have reported the associations of polymorphic CAG repeats in androgen receptor (AR) gene with PCOS risk, but with inconsistent results. So, the aim of present meta-analysis was to clarify such inconsistence, so as to provide more conclusive results.Methods
PubMed was searched for the eligible reports published until February 2012 without language limitation. The studies reporting the relationship between CAG repeat length and PCOS were selected for the meta-analysis according to the inclusion criteria. Two reviewers independently extracted the data and evaluated the study quality.Principal findings
As for the relationship between CAG repeat length and PCOS risk, the pooled results showed that the biallelic mean was not significantly different between PCOS and controls (SMD − 0.03, 95% CI − 0.16–0.10, P = 0.603), and that the ORs of PCOS were not demonstrated for the individuals with the biallelic mean less than median (OR 0.96, 95% CI 0.68–1.35, P = 0.794), with the short CAG allele (OR 0.94, 95% CI 0.80–1.10, P = 0.424), or with the X-weighted biallelic mean (OR 0.81, 95% CI 0.46–1.41, P = 0.447). Further, as for the relationship between CAG repeat length and T levels in PCOS patients, the biallelic mean was not significantly different between PCOS patients with high T and those with low T (SMD 0.79, 95% CI − 0.12–1.70, P = 0.088), while the summary correlation r indicated that the CAG biallelic mean appeared to be positively associated with T levels in PCOS (r 0.20, 95% CI 0.11–0.30, p = 0.000).Conclusions
This meta-analysis demonstrates no evident association between the CAG length variations in AR gene and PCOS risk, while the CAG length appears to be positively associated with T levels in PCOS patients. 相似文献108.
Summary In-laboratory evaluation of the larvicide effect of an aqueous extract of Persea americana (Miller 1768) on the various larval stages of Anopheles gambiae (Giles 1902) has shown that larvae at all stages are sensitive to this extract. Inversely proportional to the larval stage, their sensitivity proved to depend on the level of concentration: the higher the latter, the higher the former. Indeed, after a 24-h exposure, concentrations of 510 μg/ml resulted in the death of 100% of larvae at stages 1 and 2, whereas for the same time of exposure there was need to resort to concentrations of 850 μg/ml to kill them at stages 3 and 4. The aqueous extract of Persea americana has therefore a poisonous effect on larvae of Anopheles gambiae. This extract has direct lethal effects and acts as an inhibitor of larval development at sublethal concentration levels. 相似文献
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Meng Zhang Liang Dong Zhubing Shi Shi Jiao Zhen Zhang Wenqing Zhang Guoguang Liu Cuicui Chen Miao Feng Qian Hao Wenjia Wang Mengxin Yin Yun Zhao Lei Zhang Zhaocai Zhou 《Structure (London, England : 1993)》2013,21(4):680-688
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