高校图书馆文化建设研究

图书馆文化是现代图书馆管理模式的一个新阶段,是由传统的制度管理、目标管理向文化管理为中心的战略转移。优良的图书馆文化,能够创造出积极、和谐、上进的工作氛围,是产生源源不断的动力源泉,对图书馆事业的发展起着巨大的推动和促进作用。重视图书馆文化建设,有利于我们从新的高度推进图书馆管理科学化,促进图书馆内部管理体制改革。     

Current status and prospects of farming the giant river prawn Macrobrachium rosenbergii (De Man) in Bangladesh

Giant river prawn (Macrobrachium rosenbergii) farming plays an important role in the economy of Bangladesh. Presently, it is cultured in around 50 000 ha area with total annual production of 23 240 t. Traditional extensive prawn farming has been expanding over the last three decades through the introduction and adoption of improved culture systems, such as culture of prawn‐carps, prawn‐shrimp‐fish and prawn‐fish‐rice as concurrent and rotational systems. Efforts for the development of improved techniques on broodstock management, seed production and rearing and grow‐out of prawn have been made over the last decade. The outcomes are low‐cost feed for broodstock, production of post‐larvae in net cages (hapa), all‐male prawn culture, periphyton based prawn‐tilapia culture, C/N based prawn culture, organic prawn farming, prawn‐mola culture and prawn‐carp‐mola polyculture. Despite the development of culture technologies, a number of challenges for sustainable development of prawn farming need to be overcome to realize the potentials of this promising sector. Good aquaculture practises at all levels and application of measures for quality control and food safety would ensure sustainable development of prawn farming in Bangladesh.     

小鼠上皮细胞培养及其在EOB研究中的应用

小鼠眼睑发育需要表皮角质形成细胞的增殖、分化、凋亡及迁移的协调作用。表皮角质形成细胞是研究眼睑闭合不全机制重要的细胞模型。表皮角质形成细胞培养时,贴壁差,增殖力低,生活力弱,生长条件要求高,传代次数有限。对近年来表皮角质形成细胞的体外培养方法及其在遗传性眼睑闭合不全研究中的应用进行综述,以期为表皮角质形成细胞的长期培养和研究人类先天性眼睑发育缺陷机制提供参考。     

浅析湛江地方文化特色数据库的构建

分析了构建湛江地方文化特色数据库的重要意义,论述该特色数据库的收录内容、资料收集、建库原则、技术支持等。     

品种、培养基质和接种量对马铃薯脱毒基础苗生长的影响

以马铃薯早熟品种大西洋、中熟品种克新1号、晚熟品种青薯168脱毒基础苗为试验材料,研究品种、培养基质和接种量对马铃薯脱毒基础苗苗鲜重、根鲜重、苗干重、根干重、叶片数、株高、茎粗、根长和根条数等性状指标的影响,培养14 d时,测定各性状指标。结果表明:三个品种的主要农艺性状均在液体培养基上表现为最佳,其平均单株鲜重、干重、株高、茎粗、节长和根条数分别为:159.4 mg、9.1 mg、7.3 cm、1.16 mm、1.4 cm、5.6条。在液体培养基上,降低了马铃薯工厂化生产成本,同时还可缩短马铃薯脱毒基础苗培养时间7~9 d。接种量对马铃薯单株根鲜重、苗干重、叶片数、株高、茎粗、根长有显著性影响(P<0.05);不同成熟期品种苗鲜重、根鲜重、根干重、叶片数、株高、茎粗、根长和根条数受品种影响显著(P<0.05);不同成熟期品种、不同接种密度处理对马铃薯单株根鲜重、苗干重、根干重、叶片数、株高、茎粗、根长影响有显著性交互作用(P<0.05);早熟品种大西洋,接种密度为0.67株/cm2时,中熟品种克新1号和晚熟品种青薯168接种密度为0.80株/cm2时,综合农艺性状表现最好。     

越橘Elliot组培苗生长高度影响因素的研究

[目的]探讨影响越橘Elliot组培苗生长高度的因素。[方法]采用3因素3水平进行正交试验,研究pH值、2ip、NAA对越橘Elliot组培苗苗高生长的影响。[结果]pH值对越橘组培苗高的影响在0.01水平显著。经多重检验,最优水平是A1。[结论]影响Elliot苗高因素的顺序为：pH值〉2ip〉NAA,最佳条件为A1B3C1。     

The Prospects of Tissue Culture and Genetic Engineering for Strawberry Improvement

Abstract

Strawberry shoot meristem cultures have been used for producing virus-free strawberry plants. Plantlet regneration from leaf mesophyll protoplasts, and Agrobacterium tumefaciens mediated genetic transformation, mark the beginning of strawberry improvement with biotechnologies. The use of biotechnological tools has a greater potential in producing strawberry plants with traits such as early maturation, frost and disease resistance, mite and nematode resistance, high yield, better quality, suitability for mechanical harvesting, shipping ability, ellgaic acid content, aroma compounds and cost-effective micropropagation. Gene identification and mapping with RFLPs or RAPDs would be desirable. Transgenic strawberries should be tested for their quality before releasing to the consumers.     

Germination-enhancing and zinc-sparing roles for selenium in broccoli

Large areas of China have soils low in both available selenium (Se) and zinc (Zn). In order to investigate whether Se supplied as either selenate or selenite can increase germination and growth compared with low-Se controls we used broccoli, an important vegetable with anticancer effects, especially when biofortified with Se. Broccoli was grown under both Zn adequacy and Zn deficiency to determine whether interactions between these minerals affect plant growth. Selenite and selenate at a wide range of doses increased the speed and extent of germination. Both inorganic Se forms increased early root and shoot growth at low concentrations, with selenite having a stronger effect than selenate. A sand culture trial showed a similar growth increase due to low-dose Se under Zn deficiency but not under Zn adequacy. Conversely, at high Se levels, the results provided evidence from biomass, water use, photosynthesis and gas exchange that broccoli growth was inhibited at high Se levels, with selenite being more toxic than selenate. In this broccoli trial, the two Se forms were equally effective in increasing leaf Se concentration, whereas in most plants selenite is largely converted to organic Se forms and stored in the roots. This study suggests that Se, supplied either as selenate or selenite, may improve germination and growth in broccoli, especially on Zn-deficient soils. Field trials conducted on soils which are very low in both plant-available Se and Zn are needed.     

农业科研单位创新文化建设途径探析

科技进步离不开科技创新,科技创新又需要创新文化的支持,文章分析了农业科研单位创新文化的现状及存在的问题,提出从更新观念树立以人为本的思想、倡导追求科学真理宽容失败的科学精神、加强管理体制和机制的创新、加强精神文明建设等方面构建创新文化。     

Histopathology of Hematopoietic Tissue in Channel Catfish,Ictalurus punctatus,with Anemia

Outbreaks of anemia (CCA) in channel catfish, Ictalurirs punctatus, in Mississippi occur predominantly during spring and fall. Between October, 1990 and May, 1991, twenty-seven cases of CCA were submitted to the Mississippi Cooperative Extension Service-College of Veterinary Medicine Fish Diagnostic Laboratories. Histologic lesions were identified in the head and trunk kidneys of all affected fish. The head kidney contained less than 25% immature hematopoietic tissue in 3 of 22 cases (14%). 25-50% immature hematopoietic tissue in 7 of 22 cases (32%), and greater than 50% immature hematopoietic tissue in 12 of 22 cases (54%). The trunk kidney contained less than 25% immature hematopoietic tissue in 5 of 27 cases (18%), 25-50% immature hematopoietic tissue in 15 of 27 cases (56%), and greater than 50% immature hematopoietic tissue in 7 of 27 cases (26%). The histopathologic findings noted in cases of CCA from Mississippi affect primarily the hematopietic tissues of the head and trunk kidneys.