试论高校图书馆工作人员综合素质的培养

当今世界已步入知识经济时代,作为高等学校信息资源存储与传递基地的图书馆面临新的挑战.现着重论述了高校图书馆工作人员应具备的综合素质以及提升综合素质的有效途径.     

G-CSF促进造血功能恢复及其机理的研究

研究了粒细胞集落生长因子（Ｇ－ＣＳＦ）受辐射小鼠造血功能恢复的作用,并对机理进行了实战探讨。结果表明：Ｇ－ＣＳＦ不仅可以促进受辐射小鼠外周血细胞的恢复,促进脾脏内源性脾结节的形成,而且可以增加骨髓细胞含量和促进骨髓细胞巨噬系造血祖细胞（ＣＦＵ－ＧＭ）的形成,提高受辐射小鼠的生存率,其促进辐射后机体造血功能恢复的机理是通过刺激照射后残余造血干细胞的增殖、分化,该过程需要一段较长的时间,而不是抑制照射     

采矿工程专业工程实践性教学探讨

为满足社会用人单位对采矿工程专业人才工程实践能力培养要求,对采矿工程专业本科教学过程中如何培养学生工程实践能力等进行深入探讨。分析了目前工程实践性教学存在的问题以及矿山企业对采矿工程技术人才的新要求,提出工程实践能力培养对策,主要包括完善专业培养方案、加强实践性实习基地建设、利用政策保障工程实践性教学和加强师资队伍建设。     

Influence of γ‐irradiation and maize lipids on the production of aflatoxin B1 by Aspergillus flavus

The effect of γ‐irradiation and maize lipids on aflatoxin B₁ production by Aspergillus flavus artificially inoculated into sterilized maize at reduced water activity (a_w 0.84) was investigated. By increasing the irradiation doses the total viable population of A. flavus decreased and the fungus was completely inhibited at 3.0 kGy. The amounts of aflatoxin B₁ were enhanced at irradiation dose levels 1.0 and 1.5 kGy in both full‐fat maize (FM) and defatted maize (DM) media and no aflatoxin B₁ production at 3.0 kGy γ‐irradiation over 45 days of storage was observed. The level in free lipids of FM decreased gradually, whereas free fatty acid values and fungal lipase activity increased markedly by increasing the storage periods. The free fatty acid values decreased by increasing the irradiation dose levels and there was a significant enhancement of fungal lipase activity at doses of 1.0 and 1.50 kGy. The ability of A. flavus to grow at a_w 0.84 and produce aflatoxin B₁ is related to the lipid composition of maize. The enhancement of aflatoxin B₁ at low doses was correlated to the enhancement of fungal lipase activity.     

RELATIONSHIP BETWEEN THERMAL SHOCK STRENGTH BY LASER IRRADIATION TECHNIQUE AND FRACTURE TOUGHNESS FOR CERAMICS

The traditional water quenching technique used to evaluate the thermal shock resistance of ceramics is accompanied by an unstable heat transfer coefficient in the quenching process. This leads to an unreliable result of the value of the thermal shock strength of ceramics. Our purpose is to establish a new method using the laser irradiation technique by which the thermal shock strength of ceramics could be evaluated. Defining the laser power density, the so-called critical power density P L at which the ceramic specimen fractures, the method was evaluated both theoretically and experimentally for several structural ceramic materials. Since thermal shock fractures are caused by the induced thermal stress, the thermal shock strength must be correlated to the fracture toughness of ceramics. This study presents a relationship between the thermal shock strength P L , which corresponds to the critical powerdensity, by laser irradiation and the fracture toughness K IC by the indentation fracture technique for ceramics as a means to investigate their fracture mechanism. The thermal shock strength P L can be used as a fracture criterion corresponding to the critical temperature difference in the quenching method. The thermal shock strength for several ceramics was obtained by the irradiations with CO 2 lasers. On the other hand, their fracture toughness was measured by the indentation technique using a micro Vickers hardness tester. It was concluded that these two quantities, the thermal shock strength and the fracture toughness, were closely correlated; a linear relation was shown in a semi-log plane.     

层次分析法及其在人才招聘中的应用

通过建立层次结构,构造成对比较矩阵,计算权向量并做一致性检验,计算组合权向量并做组合一致性检验,计算出各个因素的权重,从而构造出层次分析法模型。并用层次分析法解决实际问题———工作人员的招聘,得到各因素在应聘者综合情况中的权重,从而对各应聘者的分数排名,该模型使工作人员的招聘更加客观、准确、系统、有效。     

Effect of garlic, onion, and their combination on the quality and sensory characteristics of irradiated raw ground beef

Irradiated raw ground beef had lower a*- and b*-values than nonirradiated ones regardless of garlic or onion treatment at 0 d. Irradiation increased TBARS values of control ground beef, but addition of 0.5% onion or 0.1% garlic+0.5% onion reduced oxidative changes during storage. Addition of garlic or onion greatly increased the amounts of sulfur compounds, but the increase was greater with garlic. With irradiation, the profiles and amounts of S-volatiles in raw ground beef changed significantly. However, the intensity of irradiation aroma in irradiated raw ground beef with garlic or onion was similar to that of the nonirradiated control. This indicated that some of the sulfur compounds unique to garlic or onion interacted with common sulfur compounds detected in irradiated meat and masked or changed the odor characteristics of irradiated raw ground beef. It was concluded that >0.5% onion or <0.01% garlic would be needed to mask or prevent irradiation aroma in irradiated raw ground beef.     

Effect of radiation processing of lamb meat on its lipids

The changes in lipid content of radiation processed lamb meat were investigated. Meat from the rib region of lamb had almost double the lipid content found in the leg region. No differences were observed in the lipid profile of the radiation processed and non-irradiated meat. TLC detected all the five major classes of lipids in both irradiated and non-irradiated meat. However, there was a radiation dose dependent decrease in phospholipid (PL) and cholesterol content, while an increase was observed in the free fatty acid content. The predominant fatty acids present were oleic acid, palmitic acid and stearic acid. There was a significant decrease in the ratio of PUFA/SFA of phospholipids on irradiation. Lipid peroxidation measured in terms of thiobarbituric acid-reactive substances (TBARS) increased on irradiation and chilled storage.     

辐射诱导p53腺病毒重组体转染对结直肠癌细胞周期的影响

以复制缺陷型重组腺病毒载体（AdCMV-GFP）为对照,用复制缺陷型p53重组腺病毒载体（AdCMV-p53）转染经0．5、1．0、2．0Gyγ射线照射的HT-29细胞,克隆形成法检测对细胞的抑制作用,流式细胞分析法检测细胞周期和细胞凋亡,探讨辐射诱导对AdCMV-p53转染p53突变型结直肠癌细胞（HT-29细胞系）细胞周期的影响。结果显示,0．5—1．0Gy辐射诱导明显增强40MOIAdCMV-p53转染对HT-29细胞的抑制。与AdCMV-p53转染对照相比,1d后,辐射诱导转染组G0／G1期细胞减少5％-15％,s期细胞增加2％-19％,2．0Gy辐射诱导80MOI AdCMV-p53转染组G2／M期细胞增加12％;3d后,0．5、1．0Gy辐射诱导40MOI AdCMV-p53转染组G2／M期细胞分别增加10%-13％。辐射诱导AdCMV-p53转染组细胞凋亡与辐射诱导剂量和AdCMV-p53转染剂量相关。以上结果表明,辐射诱导加速AdCMV-p53转染细胞由Go／G1期到S期的进程,促进S期阻滞和G2／M期阻滞发生。     

Pigment analysis of a color-leaf mutant in Wandering Jew （Tradescantiafluminensis） irradiated by carbon ions

Many mutants of plant induced by heavy ion beam irradiation have been reported in recent years,but leaf anthocyan mutants induced by ion irradiation in evergreen were rarely found.In this study,a color-leaf mutant with purple leaves,stems and petals was isolated from clones of Wandering Jew irradiated by 95.8 MeV/u carbon ion beam.The concentration and histological distribution of leaf pigment were surveyed in wild type and mutant.In mutant,contents of total chlorophylls (Chl),chlorophyll a (Chl a),chlorophyll b (Chl b) and carotenoids (Car) decreased significantly,while concentration of the anthocyanins was 6.2-fold higher than that of wild type.Further composition analysis of anthocyanins by electrospray ionization mass spectrometry (ESI-MS) indicated that the purple pigmentation of leaves in mutant was caused by accumulation of petunidin anthocyanin.Microscopic examination showed that most petunidin anthocyanin accumulated in the lower epidermis,and little in vascular parenchyma of mutant,while there was no pigment in wild type.Meanwhile,in spongy parenchyma of mutant we observed little Chl,which the wild type abounds in.In conclusion,the color-leaf mutant of Wandering Jew induced by irradiation of carbon ions was improved in ornamental value,and it could be contribute to variation in level,component and distribution of foliar pigment.The possible mutation mechanisms were discussed.