4种植物生长调节剂对台农控梢效果及对花的影响

本文选用4种植物生长调节剂(氟节胺、调环酸钙、烯效唑、多效唑)探究对台农芒果的控梢效果,以及对后期抽花率及花穗长的影响。结果表明：芒果控梢中期进行用药,氟节胺、调环酸钙、烯效唑调环酸钙复配和多效唑处理可显著降低新梢长,多效唑、烯效唑调环酸钙复配、调环酸钙配合乙烯利有良好的脱叶和杀嫩芽的效果。药剂处理控梢效果越好,花穗长度越短。     

Phosphorelay and transcription control in cytokinin signal transduction

The past decade has seen substantial advances in knowledge of molecular mechanisms and actions of plant hormones, but only in the past few years has research on cytokinins begun to hit its stride. Cytokinins are master regulators of a large number of processes in plant development, which is known to be unusually plastic and adaptive, as well as resilient and perpetual. These characteristics allow plants to respond sensitively and quickly to their environments. Recent studies have demonstrated that cytokinin signaling involves a multistep two-component signaling pathway, resulting in the development of a canonical model of cytokinin signaling that is likely representative in plants. This Viewpoint outlines this general model, focusing on the specific example of Arabidopsis, and introduces the STKE Connections Maps for both the canonical module and the specific Arabidopsis Cytokinin Signaling Pathway.     

Resources required for global tuberculosis control

We estimate that to achieve the World Health Organization's tuberculosis control targets, the 22 high-burden countries (HBCs) that collectively account for approximately 80% of the world's tuberculosis cases require about $1 billion per year during the period 2001 to 2005. A further $0.2 billion per year is needed for low and lower-middle income countries outside the 22 HBCs. There is a resource gap of up to around $300 million per year. Substantial progress in tuberculosis control could be achieved with increased investment that is large in the context of existing spending, but small in the wider context of global health expenditure.     

海门山羊GATA-4转录因子的表达

本试验选用2个山羊品种(海门山羊和安徽白山羊),采用实时定量PCR技术,检测了GATA-4转录因子在2个山羊品种下丘脑、肌肉、心脏、垂体、卵巢、肝、子宫、脾、肾和脑组织中的表达情况。结果显示:GATA-4转录因子在海门山羊各组织中都有表达,且在海门山羊下丘脑和垂体组织中GATA-4转录因子的表达量高于安徽白山羊。表明GATA-4在海门山羊下丘脑和垂体组织中的表达水平可能影响海门山羊的繁殖能力。     

A new global effort to control malaria

The time has come to resurrect a worldwide effort to control malaria, following decades of neglect during which the disease has resurged in many parts of sub-Saharan Africa and other endemic regions.     

猪TLR4基因单核苷酸多态性对转录的影响

TLR4能识别革兰氏阴性菌脂多糖,并将信号向下游传递,启动天然免疫反应并诱发获得性免疫反应,在机体的防御反应中发挥重要作用。研究利用PCR-RFLP方法对TLR4基因的3个SNPs位点(c.611 T>A、c.962 G>A和c.1027 C>A)进行基因型分析,同时利用荧光定量PCR法检测每个个体TLR4基因的表达量,统计学方法比较不同基因型个体间表达量的差别。发现SNPs c.611 T>A和c.962 G>A显著影响TLR4的转录(P<0.05)。结果表明,SNPs c.611 T>A和c.962 G>A引起的蛋白质合成量变化,影响机体免疫反应。     

基于HACCP理论的酒曲害虫防治方法探讨

利用HACCP理论,分析酒曲害虫防治过程的关键环节,并针对关键环节制定防治措施,以达到良好的曲虫防治效果。实验结果表明,曲虫治理中的关键曲虫为咖啡豆象,曲虫防治的关键环节为出房曲的曲虫感染治理以及在采取曲虫治理手段的同时采用覆盖等隔离手段。针对关键环节采取治理措施,能达到高效地预防为主的防治效果。     

不同植物生长调节剂与90%嘧草硫醚混配在棉田杂草防除中的应用

为研究开发一种新型安全、高效的棉田苗后茎叶处理除草剂,选择1.6%胺鲜酯水剂、1.8%复硝酚钠水剂和0.01%14-羟基油菜素甾醇可溶液剂这3种植物生长调节剂与除草剂90%嘧草硫醚原药和108 g/L高效氟吡甲禾灵乳油进行合理混配,研究其对棉田杂草的防治效果及对棉花安全性的影响。结果表明,这3种植物生长调节剂均可有效缓解90%嘧草硫醚对棉花产生的药害现象,但对除草效果的影响表现不一。1.6%胺鲜酯水剂可显著提高90%嘧草硫醚原药与108 g/L高效氟吡甲禾灵乳油混剂对棉田杂草的防效,而0.01%14-羟基油菜素甾醇可溶液剂对二者混剂的防效无明显影响,1.8%复硝酚钠水剂与二者混剂配合使用会降低防效。因此,可使用90%嘧草硫醚原药100 g/L+108 g/L高效氟吡甲禾灵乳油300 m L/hm2+1.6%胺鲜酯水剂225 mL/hm2于棉花出苗后三至五叶期、一年生禾本科杂草四至六叶期、阔叶杂草三至五叶期进行行间定向喷雾处理。     

An insulin-stimulated protein kinase similar to yeast kinases involved in cell cycle control

A protein kinase characterized by its ability to phosphorylate microtubule-associated protein-2 (MAP2), is thought to be an early intermediate in an insulin-stimulated phosphorylation cascade and in a variety of other mammalian cell responses to extracellular signals. A complementary DNA that encodes this protein serine-threonine kinase has been cloned, and the protein designated extracellular signal-regulated kinase 1 (ERK1). ERK1 has striking similarity to two protein kinases, KSS1 and FUS3, from yeast. The yeast kinases function in an antagonistic manner to regulate the cell cycle in response to mating factors. Thus, ERK1 and the two yeast kinases constitute a family of evolutionarily conserved enzymes involved in regulating the response of eukaryotic cells to extracellular signals.