AtHsfA2 modulates expression of stress responsive genes and enhances tolerance to heat and oxidative stress in Arabidopsis

In nature, plants are subject to changes of tempera-ture. Thus, like other organisms, plants have evolved strategies for preventing damage caused by rapid changes in temperature and for repairing what damage is unavoidable. Heat stress responses have been well documented in a wide range of organisms. In all spe-cies studied, the heat shock (HS) response is charac-terized by a rapid production and a transient accumu-lation of specific families of proteins known as heat shock proteins (Hsps) th…     

Establishment of trophic continuum in the food web of the Yellow Sea and East China Sea ecosystem: Insight from carbon and nitrogen stable isotopes

The determination of trophic level for the biology in a marine ecosystem is very important as alteration of its structure and function may be reflected in the tro-phic level of component species. A change in trophic level indicates variation in an organism’s feeding bi-ology or in the pathway of energy flow from primary producers to the consumer. The gut content analysis is a traditional method for studying trophodynamics of food web in marine ecosystems. Species composition and amounts in al…     

The algae-lytic ability of bacterium DC10 and the influence of environmental factors on the ability

Nowadays, eutrophication and massive accumula-tions of microalgae have caused serious environmental problems. So it is very important to find an effective method for controlling the growth of the algae and the algal blooms. Measures for controlling the algae in-clude physical, chemical and biological means. Physi-cal means are limited and usually act as an assistant for controlling the algae, and include mechanical means, high frequent electromagnetic pulses and ul-trasonic processes[1]. Algae…     

Cortactin mediated morphogenic cell movements during zebrafish (Danio rerio) gastrulation

Cortactin, a filamentous actin (F-actin) associated protein and a prominent substrate of protein tyrosine kinase Src[1,2], is composed of several functional do-mains, including an amino terminal domain (NTA) that is rich in acidic residues, six and one half 37-amino-acid tandem repeating segments, an al-pha-helical motif, a less conserved region but rich in tyrosine, proline, serine and threonine residues, and a Src homology 3 (SH3) domain at the distal carboxyl terminus. In mammalian cells …     

Systemic induction of H2O2 in pea seedlings pretreated by wounding and exogenous jasmonic acid

Mechanical stress was one of stresses with whichplants often met. With the development of fruit andvegetable finish machining in food industry, artificialinjury also appeared. As response to other stresses,plants have evolved with some adaptive mechanismsto cope with wounding[1]. Jasmonic acid (JA) andmethyl jasmonate (MeJA), as important signal mole-cules in plant response to wounding, have attracted agreat deal of attention. The studies on some crops, suchas potato[2], rice[3], and tomato[…     

芦竹内生真菌F0238细胞生长及其代谢调控

对芦竹内生真菌F0238的细胞生长和代谢产曲酸量进行了代谢调控。结果表明,F0238生长及产曲酸的营养和环境条件为：PDA培养基,8％淀粉为碳源,0．2％蛋白胨为N源,发酵温度28℃,初始pH为6．5,发酵时间5d／（120h）,装液量80mL/500mL三角瓶。在摇瓶试验的基础上,对该菌发酵过程作了初步放大试验（10L全自动发酵罐）,得到F0238发酵过程的动态曲线。动态曲线反映了在一个发酵周期内,发酵液的pH值、DO值及残糖的降低趋势和生物量与抗菌产物量的上升趋势。     

枯草芽孢杆菌B-903菌株的诱变选育*

枯草芽孢杆菌B-903菌株是由河南省农业科学院植物保护研究所从郑州果园中分离得到,其代谢产生的抗菌物质对多种植物病原真菌具有较强抑制作用。以此菌株为出发菌株,进行亚硝基胍(NTG)和微波诱变处理,确定了二者诱变处理的最佳处理剂量:NTG最佳处理浓度为200μg/mL,微波诱变为HI微波挡(850W、脉冲频率2450MHz)处理100s,筛选出13个高效突变株。经传代实验,2株高效突变株N₁和W₂抑菌圈直径分别稳定在26mm和24mm以上,比出发菌株提高21·8%     

几株光合细菌的分离鉴定及在养殖罗非鱼中的应用*

从渔场底泥样品中分离纯化得到5株紫色非硫光合细菌,根据分离菌株的细胞形态结构、光合内膜结构、活细胞光吸收特征以及生理生化特征,参照伯杰氏细菌分类学手册,5个分离株分别属于沼泽红假单胞菌(Rhodopseudom onas palusteris)和类球红细菌(Rhodobacter spheroides)。利用它们的纯培养物及混合培养物进行的水产养殖试验表明,光合细菌可以明显提高养殖鱼的成活率以及生长速度,罗非鱼经过2周的养殖后,加入光合细菌的试验组比没加入光合细菌的对照组(成活     

中菊头蝠中国三亚种的形态特征比较

比较了四川、广东和海南3地的中菊头蝠(Rhinolophus affinis)种群的外部和头骨形态差异。在测量23个外部可量性状以及22个头骨可量性状的基础上,运用统计分析软件SPSS12.0对其中12个外部可量性状以及22个头骨可量性状进行数理统计。主成分分析的结果表明四川、广东和海南3地的中菊头蝠在外部形态和头骨形态上均有明显差异,用判别分析对主成分分析结果的正确性进行验证,证明了中国的中菊头蝠划为喜马拉雅、华南、海南3个亚种是合理的。     

有线电视在医院手术演示中的作用

电化教育是学习、教育的一种重要手段,它不仅直观,能加深理解,丰富教育内容,充分发挥视听并用的优势,加强学习效果,而且还具有迅速及时,覆盖面广,方便自学,收效大等特点,因此普遍受到包括医务工作在内的广大学习的欢迎。有线电视是一种非常有效的电化教育手段。通过有线电视,能提供直观的素材,促进人们对知识的理解,把抽象内容具体化。据研究。在人的五种感觉器官中,人类获取的信息83％来自视觉。11％来自听觉,单靠视觉学习记忆的约有27％,单靠听觉学习记忆的有16％。视听并用时记忆力最高可达66％。有线电视声像同步传递信息,有利于知识的吸收和积累。同时,医学教育是实践性很强的教育,医生要在基础理论知识之上获得感性知识和医疗经验,手术演示在医学教育中有着举足轻重的作用,但手术现场由于受到环境、场地等条件限制,能到现场观摩的人数有限,通过有线电视现场直播能扩大收视范围,增加观摩人数,通过增加硬件设施,同台手术能让成百上千的人观摩,大大满足了学习、交流的需要。