论外来词

随着科学技术的迅猛发展以及我国对外交往的日益频繁,外来词（借词）特别是英语词汇越来越多地渗透到我们的日常生活中.不少人对此表现出了很深的忧虑：这会不会破坏汉语文字的纯洁性？本文主要对外来词所涉及的内容、存在的依据、借用的形式以及应用等方面进行探讨,并着重指出外来词不会影响汉语的纯洁性;相反,外来词的借入会不断地丰富我们的语言宝库,因此人们应该以一种更开放的心态来吸纳外来词.     

饲料加工工对营养物质利用率及畜禽生产性能的影响

高品质的饲料产品不仅取决于配方好坏、原材料的优劣,同时加工工艺也起着重要的作用.饲料在加工过程中会发生一系列物理、化学变化,从而影响饲料中各种营养成分的利用率,以及动物的生产性能.文中从饲料粉碎粒度、混合均匀度、膨化与否、制粒效果方面对营养物质利用率和畜禽生产性能的影响作一综述.     

饲用塑性大豆浓缩磷脂流态化研究

研究了温度和水分含量对饲用大豆浓缩磷脂黏度的影响,发现Na 能提高浓缩磷脂的黏度,而Ca2 能降低浓缩磷脂的黏度。对于水分含量较低的塑性浓缩磷脂,添加0.4%的氯化钙或添加3%大豆油脱臭馏出物能显著降低低水分塑性浓缩磷脂的黏度,使其流态化。但对于高水分塑性浓缩磷脂,其作用不明显。0.3%的氯化钙和3%的大豆油脱臭馏出物复合使用能使塑性浓缩磷脂的黏度降到2000cPa.s以下,而且长时间保持稳定。     

WTO协议的文体特征探析

应用现代文体学理论并结合语用学和认知语言学理论观点,尝试从字位与书写、词汇、句法层面描述和分析WTO英文协议的文体特征,希望对理解和翻译世界贸易法规和类似的经贸法规有所帮助。     

供水工程影响下中国北方地区耕地后备资源开发潜力

灌溉水源是北方地区耕地后备资源能否有效开发的关键。当前,中国正在推动国家水网工程规划建设,为北方地区耕地后备资源开发提供了新的机遇。在以往研究基础上,该研究考虑北方地区已建、在建及规划的供水工程,基于自然适宜、利用高效、发展稳定三方面评价准则,结合三维魔方空间分类方法,开展了雨养情景和供水灌溉情景下耕地后备资源开发潜力分析。结果表明：雨养农业情景下,北方地区勉强适宜（Ⅱ级）、中度（Ⅲ级）和高度（Ⅳ级）适宜的耕地后备资源面积分别为2.9万、1.0万和0.6万km²。灌溉农业情景下,耕地后备资源面积明显增加,勉强适宜（Ⅱ级）、中度（Ⅲ级）和高度（Ⅳ级）适宜的耕地后备资源面积将分别达到5.4万、7.6万和6.5万km²,主要集中于新疆、内蒙古和甘肃3省（自治区）。该研究结果可为中国耕地后备资源开发利用及国家水网工程效益发挥提供参考。     

The application of atomic force microscope in clinic diagnosis of erythrocytes

AIM: To investigate the application of atomic force microscope (AFM) in clinic diagnosis. METHODS: Topographic images and some parameters of large range field and microstructures of erythrocytes in the blood of normal subjects, lung cancer and myelodisplastic syndrome (MDS) patients were examined by atomic force microscope. RESULTS: Many clear topographic images of many erythrocytes, single erythrocyte, and microstructure of erythrocyte membrane surface were obtained. Many erythrocytes in lung cancer patients were found to change into echinocytes. One erythrocyte had 10-20 protuberances, most of which, with a mean width of 589. 0 nm and a length of 646. 7 nm, were on the edge of cells. The protuberances on the center of echinocytes are lodged and embedded. The erythrocytes of MDS patients were biconcave in shape. Many apertures with different diameters of tens to hundreds nanometer appeared on the surface of cell membrane. CONCLUSIONS: AFM can be widely applied in clinic pathological inspection, including quantification of cells, obtainment and comparison of many parameters (such as diameter, thickness, volume, surface, surface area/volume ratio), observation of topograph of single cell, and observation and comparison of membrane surface microstructure of cells, and so on.     

Effects of PD98059 on the differentiation from mesenchymal stem cells to osteoblasts

AIM: To investigate the effects of PD98059 on the differentiation from mesenchymal stem cells to osteoblasts.METHODS: hMSC were separated from human marrow and expanded in cuture medium. hMSC were induced with dexamethasone, β-glycerophosphate, vitamin C which acted as osteoblast differentiation inducer. PD98059 was added into the osteoblasts induction medium. The cells were assayed with cell morphology, alkaline phosphatase (AP) activity and calcium deposition. RESULTS: The isolated cultured MSC comprised a single phenotypic population and displayed a fibroblast-like morphology. After induced with osteoblasts induction medium, the cells showed changes in cell morphology from spindle-shape to cuboidal and polygonal. The AP activity increased gradually and reached the peak in 12 days, then decreased. Many scattered tangerice calcium nodes were observed. PD 98059 significantly inhibited AP activity and calcium deposition in a dose-dependent manner. A striking observation of the present study was that a few adipocytes appeared in cultures that were treated with PD 98059 and osteogenic differentiation medium. CONCLUSION: These results indicated that osteogenic diferentiation from the hMSCs was related to the activation of the ERK.