四川宜宾三种乔木内生真菌的多样性

对四川宜宾同一生境中的油樟 [Cinnamomum longepaniculatum (Gamble) N. Chao]、香樟 [C. camphora(Linn.) Presl]和白栎(Quercus fabri Hance)三种30棵乔木根、茎、叶中的内生真菌多样性进行了研究。结果显示：三种植物中的内生真菌在属一级分类单位上都存在一定程度的多样性和器官特异性, 组丝核菌属(Phacodium Pers.)为3种植物内生真菌共有的优势属; 同时, 通过对3种植物内生真菌的比较, 发现3种植物整体及对应部     

阔筋膜与涤纶布修补术对胸壁肿瘤切除后胸壁缺损的临床疗效

目的:探讨阔筋膜修补术与涤纶布修补术对胸壁肿瘤切除后胸壁缺损的临床疗效观察。方法:选取我院胸外科收治的早期胸壁肿瘤患者81例,随机分为阔筋膜组40例行阔筋膜修补术,涤纶布组41例行涤纶布修补术。比较两组患者术后镇痛药用量、肺部体征、引流量、CRP、白细胞及临床康复情况。结果:治疗后与阔筋膜组比较,涤纶布组患者术后镇痛药量、呼吸受限时间及胸膜粘连发生率均较低,(P0.05)。与治疗前比较,两组患者白细胞水平均升高(P0.05),C反应蛋白水平均降低,(P0.05)。与阔筋膜组相比较,涤纶组白细胞水平,C反应蛋白水平均较低(P0.05),涤纶布组治疗后SPO2水平恢复正常的天数缩短(P0.05)。与阔筋膜组比较,涤纶布组患者术后发热天数,引流天数及住院天数均较少,(P0.05)。结论:涤纶布修补术较传统阔筋膜修补术临床疗效优越,且患者痛苦小,术后恢复快,对临床具有指导意义。     

麻栎壳斗染料在羊毛染色中的应用

本文研究了提取自麻栎壳斗的植物染料(麻栎染料)的耐酸、碱稳定性,染浴pH值及铝、铁离子等环保型媒染剂对其染毛织物效果的影响,并且探究了其染色动力学.研究表明,麻栎染料在强酸性染浴(pH=3)中对羊毛织物直接性好,染色后毛织物得棕色,也可采用铝离子、铁离子对直接染色后的毛织物进行后媒染,以得到不同色相的毛织物,尤其是铁后...     

绿僵菌无纺布菌条的制作(Ⅰ)液体种子培养条件

研究了金龟子绿僵菌菌株Ma83液体培养最佳营养及环境条件,为无纺布培养提供良好的液体种子.以生物量为指标,通过液体摇瓶试验确定了绿僵菌Ma83菌株液体种子培养参数,对不同的氮源、碳源及其浓度和初始pH进行单因素分析.结果表明,绿僵菌Ma83菌株液体种子培养最佳营养条件为4%黄豆粉,2%白砂糖,0.5%MgSO4·7H2O,0.05g/LKCl,0.1g/L FeSO4·7H2O,1.0g/L KH2PO4,pH6.3～6.5.70L发酵罐培养,干生物量第三天可达35g/L,显著优于筛选前培养基(SDA,28g/L,a=0.05).     

Tooth components of mandibular deciduous molars of Homo sapiens sapiens and Homo sapiens neanderthalensis: a radiographic study.

Tooth components of deciduous molars were measured from standardized radiographs of Homo sapiens sapiens and Homo sapiens neanderthalensis. Enamel height and width were greater in deciduous teeth of Homo sapiens sapiens than in Homo sapiens neanderthalensis and the differences were statistically significant (p less than 0.01). Dentin height showed no significant differences between the two groups, but enamel to floor of pulp chamber and pulp height and width dimensions were significantly greater in Homo sapiens neanderthalensis. Discriminant analysis carried out between groups, using deciduous tooth components, showed an accuracy of 98-100% for identification of Homo sapiens sapiens and 83-92% for identification of Homo sapiens neanderthalensis. The results obtained in this study on dental dimensions support the hypothesis of a distinct evolutionary line for Neanderthals.     

Functionalization of cotton fabrics with titanium oxide doped silver nanoparticles: Antimicrobial and UV protection activities

The target of our current work was designed to prepare titanium oxide doped silver nanoparticles (Ag/TiO₂NPs) and their impact on the functionalization of cotton fabrics. Additionally, the effect of Ag/TiO₂NPs was compared with the individually prepared silver nanoparticles (AgNPs) and titanium oxide nanoparticles (TiO₂NPs). In this work, AgNPs were prepared in the solid state using arabic gum as efficient stabilizing and reducing agent. Then, two concentrations of the as-synthesized nanoparticles were used to functionalize the cotton fabrics by pad-dry-cure treatment in the presence of fixing agent to increase the durability of treated cotton fabrics against vigorous washing cycles. The findings implied that the as-prepared nanoparticles were successfully synthesized in nano-size with spherical shape and homogeneity. The efficacy of the functionalized cotton fabrics with those nanoparticles were evaluated in terms of multifunctional properties including antimicrobial and ultraviolet protection factor (UPF) and the mechanical features before and after many washing cycles; 10, 15 and 20 times. The resultant also proved that Ag/TiO₂NPs-treated cotton fabrics exhibited the greater values of both antimicrobial and UPF properties with enhancement in the tensile strength and elongation features. Thus, the combination between these two nanoparticles through doping reaction is suitable for imparting superior antimicrobial properties against the four tested microbial species (Staphylococcus aureus, Escherichia coli, Candida albicans, and Aspergillus niger) and good UPF properties. Depending on the promising obtained results of the multi-finishing fabrics, these nanoparticles of Ag/TiO₂NPs can be applied for the production of an efficient medical clothes for doctors, nurses and bed sheets for patients in order to kill and prevent the spread of bacteria and then, reduce the transmission of infection to others.     

Energy use and recovery strategies within wastewater treatment and sludge handling at pulp and paper mills

This paper presents an inclusive approach with focus on energy use and recovery in wastewater management, including wastewater treatment (WWT) and sludge handling. Process data from three Swedish mills and a mathematical model were used to evaluate seven sludge handling strategies. The results indicate that excess energy use in WWT processes counters the potential energy recovery in the sludge handling systems. Energy use in WWT processes is recommended to aim for sufficient effluent treatment, not for sludge reduction. Increased secondary sludge production is favourable from an energy point of view provided it is used as a substrate for heat, biogas or electricity production.     

绿僵菌无纺布菌条的制作(I)液体种子培养条件

研究了金龟子绿僵菌菌株M a83液体培养最佳营养及环境条件,为无纺布培养提供良好的液体种子。以生物量为指标,通过液体摇瓶试验确定了绿僵菌M a83菌株液体种子培养参数,对不同的氮源、碳源及其浓度和初始pH进行单因素分析。结果表明,绿僵菌M a83菌株液体种子培养最佳营养条件为4%黄豆粉,2%白砂糖,0.5%MgSO4.7H2O,0.05g/LKC l,0.1g/L FeSO4.7H2O,1.0g/L KH2PO4,pH6.3~6.5。70L发酵罐培养,干生物量第三天可达35g/L,显著优于筛选前培养基(SDA,28g/L,a=0.05)。     

Occurrence and characterization of actinobacteria and thermoactinomycetes isolated from pulp and board samples containing recycled fibres

The aim of this study was to characterize the actinobacterial population present in pulps and boards containing recycled fibres. A total of 107 isolates was identified on the basis of their pigmentation, morphological properties, fatty acid profiles and growth temperature. Of the wet pulp and water sample isolates (n=87), 74.7% belonged to the genus Streptomyces, 17.2% to Nocardiopsis and 8.0% to thermoactinomycetes, whereas all the board sample isolates (n=20) were thermoactinomycetes. The identification of 53 isolates was continued by molecular methods. Partial 16S rDNA sequencing and automated ribotyping divided the Streptomyces isolates (n=31) into 14 different taxa. The most common streptomycetes were the mesophilic S. albidoflavus and moderately thermophilic S. thermocarboxydus. The Nocardiopsis isolates (n=11) belonged to six different taxa, whereas the thermoactinomycetes were mainly members of the species Laceyella sacchari (formerly Thermoactinomyces sacchari). The results indicated the probable presence of one or more new species within each of these genera. Obviously, the drying stage used in the board making processes had eliminated all members of the species Streptomyces and Nocardiopsis present in the wet recycled fibre pulp samples. Only the thermotolerant endospores of L. sacchari were still present in the final products. The potential of automated ribotyping for identifying actinobacteria was indicated, as soon as comprehensive identification libraries became available.     

Methylobacterium sp. isolated from a Finnish paper machine produces highly pyruvated galactan exopolysaccharide

The slime-forming bacterium Methylobacterium sp. was isolated from a Finnish paper machine and its exopolysaccharide (EPS) was produced on laboratory scale. Sugar compositional analysis revealed a 100% galactan (EPS). However, FT-IR showed a very strong peak at 1611 cm(-1) showing the presence of pyruvate. Analysis of the pyruvate content revealed that, based on the sugar composition, the EPS consists of a trisaccharide repeating unit consisting of D-galactopyranose and [4,6-O-(1-carboxyethylidene)]-D-galactopyranose with a molar ratio of 1:2, respectively. Both linkage analysis and 2D homo- and heteronuclear 1H and 13C NMR spectroscopy revealed the following repeating unit: -->3)-[4,6-O-(1-carboxyethylidene)]-alpha-D-Galp-(1-->3)[4,6-O-(1-carboxyethylidene)]-alpha-D-Galp-(1-->3)-alpha-D-Galp-(1-->. By enrichment cultures from various ground and compost heap samples a polysaccharide-degrading culture was obtained that produced an endo acting enzyme able to degrade the EPS described. The enzyme hydrolysed the EPS to a large extent, releasing oligomers that mainly consisted out of two repeating units.