环境监测的新突破——BOD快速测定仪

生物化学需氧量(BOD)是环境监测工作中的一项重要指标,它表示水中有机物的综合污染程度.目前国内外普遍规定样品在20±1℃的温度中培养五天,分别测定培养前后的溶解氧,二者之差即为BOD5值,以氧的毫克/升(mg/L)表示.     

山东近海海水COD与BOD相关性研究

传统方法检测生化需氧量(BOD)的测量时间过长问题制约着该领域的发展,而寻求化学需氧量(COD)和BOD之间的相关性,可在使用光学方法测得水体COD值的同时获得BOD值.为研究海水中COD与BOD间的关系,对山东地区多个站点海水COD、BOD、溶解氧、温度等参数进行测定,并对实验数据进行数理统计分析.结果表明,COD与...     

不同温度培养对根癌农杆菌生长及水稻幼胚再生的影响

设计26,30,34,36,38,40℃6个温度对根癌农杆菌进行培养.结果显示:根癌农杆菌在38℃和40℃条件下无法生长;将水稻幼胚经26℃诱导获得的愈伤组织分别放置在农杆茵不能耐受的38℃和40℃环境中培养.并设计了7,14,21,28d不同培养时间,同时以26℃常规培养温度作为对照,分析在较高温度条件下培养对水稻愈伤组织再生的影响.结果显示:水稻幼胚诱导的愈伤组织经过38℃所有时间及40℃部分时间(7,14d)下模拟抗性筛选培养,仍然能够正常生长,而且经38℃、14d继代培养的愈伤组织植株再生率比26℃常规培养提高63.17%,统计分析两者达显著差异.     

臭氧氧化法预处理叔丁醇模拟废水

本文采用臭氧氧化技术对叔丁醇模拟废水进行预处理,考查了臭氧进气量、溶液pH值、反应温度和反应时间对废水化学需氧量(CODCr)的影响.实验结果表明:在pH值为11.00、臭氧进气量为1400mg/h的条件下,反应时间90min、反应温度35℃,废水的CODCr去除率达到31.93％,BOD5/CODCr由0.001提高到0.2～0.3.     

松突圆蚧发育起点温度和有效积温的测定及其应用

采用恒温培养与林间观察相结合的方法对松突圆蚧发育的起点温度和有效积温进行测定,结果表明:松突圆蚧各虫期的发育起点温度分别为1龄若虫(6.99±0.23)℃,2龄若虫(8.74±1.06)℃,蛹期(13.08±1.56)℃,雌成虫期(9.44±1.22)℃,整个生活史(10.47±1.03)℃;有效积温分别为1龄若虫208.30℃.d,2龄若虫200.23℃.d,蛹期77.61℃.d,雌成虫期477.80℃.d,整个生活史810.87℃.d。用有效积温法估测松突圆蚧在福建省各县(市、区)和广东部分地区可能发生的世代数,估测值与实际年发生世代数基本相符,可作为松突圆蚧监测预警和防治决策的依据。     

不同高温温度致神经上皮细胞凋亡的研究

目的:研究不同高温温度致原代神经上皮细胞的凋亡情况。方法:取孕12d小鼠胚胎神经管上皮细胞进行原代培养,将其分为正常对照组、39℃高温组、40℃高温组和41℃高温组。倒置相差显微镜下观察细胞的形态学变化,MTT法测定细胞活性,DAPI染色法测定细胞凋亡率。结果:MTT法测得各高温组细胞光密度值(OD值)均低于正常对照组,且温度越高OD值越低;高温后12h各高温组细胞凋亡率均高于正常对照组,差异有统计学意义;高温后24h,40℃、41℃高温组细胞凋亡率高于正常对照组(P<0.01)。结论:40℃是研究高温致神经上皮细胞凋亡的适宜温度。     

绳状青霉及其代谢产物浸铀研究

本文开展绳状青霉直接浸铀研究,探索培养温度、培养时间、接种量对铀浸出率的影响;同时开展绳状青霉代谢产物浸铀研究,探索不同pH值的绳状青霉代谢产物的铀浸出率。结果表明,当培养温度为35 ℃、培养时间为3 d、接种浓度为0.1%时,绳状青霉直接浸铀的铀浸出率为70.13%;当绳状青霉代谢产物的pH值为2.6时,铀的浸出率达到峰值,为82.58%。     

嗜酸氧化亚铁硫杆菌驯化条件的研究

随着办研究氧化亚铁硫杆菌结果表明,最佳培养温度为30℃左右,最佳生长pH为2.0～2.5,最佳生长初始Fe2+浓为0115mol/L左右,在进行细菌培养时接种量取10%比较恰当.低pH值和高浓度Fe2+驯化后,在培养温度30℃、初始pH值1.5、初始Fe2+浓度25g/L条件下,氧化亚铁硫杆菌仍能保持一定的Fe2+氧化活性,6天Fe2+氧化率可达82.28%,Fe2+平均氧化速率达3.43g/L/d,pH值的变化是先上升后下降,最后稳定在1.81.     

纳木错牦牛粪便中纤维素降解菌的鉴定及产酶特征

通过富集、纯化从西藏纳木错的牦牛粪便中筛选得到2株高效纤维素降解菌株，采用滤纸条崩解试验测定不同培养温度、培养时间和初始pH值条件下纤维素降解菌株的产酶特征，并初步分析了目标菌株的遗传地位.结果表明，菌株X1和X2具有显著降解纤维素优势，两菌株在培养温度9℃、培养时间6 d、初始pH值4的条件下，产出的纤维素降解酶具有较强的相对酶活性.系统发育分析显示，X1和X2可能为Cronobacter属菌株.     

冷藏温度对金枪鱼品质变化的影响研究

研究了大眼金枪鱼冷藏温度和品质之间的变化规律.以-20℃,-30℃,-60℃,-80℃下冷藏的大眼金枪鱼的肉和内脏为研究对象,选择pH值、TBA值、TVBN值、蛋白质含量和高铁肌红蛋白含量为检测指标,每隔15 d进行检测一次,获得大眼金枪鱼的酸度、脂肪含量、蛋白质含量等品质指标随储藏温度和时间的变化规律.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.