双歧杆菌酸奶冻干发酵剂不同菌株特性的研究

研究了不同来源的4株双歧杆菌在乳中的生长与发酵特性、冷藏期间的存活力和后酸化活性以及抗冷冻干燥特性。结果表明:4菌株在乳中42℃发酵的凝乳时间均为6.0h,Blm和Bbm凝乳后的活菌数高,均在1×109cfu/mL以上,而其pH值均在5.0左右,滴定酸度70～80°T,且无显著差别;4菌株在发酵后的酸乳中冷藏期间,Blm和Bbm的存活力高,Blm、Bbm和Blr均表现出较低的后酸化活性;4℃冷藏21d,Blm和Bbm活菌数下降至不足1个log数量级,Blm、Bbm和Blr的酸度上浮不足10°T,pH值下降仅0.2～0.3;4菌株在以脱脂乳为保护剂的冷冻干燥试验中,Blm和Bbm抗冻干性强,其冻干存活率均在30%以上。     

电厂精处理混床树脂再生度测定方法研究及应用

树脂再生度是表征高速混床树脂再生程度的指标。基于电厂实际需要,结合高速混床离子交换树脂性能特点和离子交换水处理再生工艺,建立了一种运行树脂再生度测试方法,用于电厂凝结水精处理混床树脂再生度的定量测定。     

凝结水精处理混床树脂分离度测定方法及系统

树脂分离度是表征高速混床树脂再生程度的指标。基于电厂实际需要,结合高速混床离子交换树脂性能特点和离子交换水处理再生工艺,建立了一种凝结水精处理混床运行树脂再生度测试方法及系统。该系统对树脂样品中的杂质树脂实现了彻底分离,计量方法准确可靠,满足了电厂对凝结水精处理混床树脂分离度定量测定的实际需要。     

骨肉泥丁鲜辣酱的研制

骨肉泥丁鲜辣酱以猪骨泥、猪肉糜为主要原料，经正交试验确定最佳工艺配方制成骨肉泥丁，添加到辣椒糊中，既提高了制品的营养价值，又明显改善了辣椒酱的口感和风味。     

特宽幅织机经向连续性疵点的控制措施

探讨双织轴喷气织机织造特宽幅织物时经向连续性疵点的有效控制措施.将经向连续性疵点分为筘路、左右色差布、磨痕、断经等几类,分析了各类疵点产生的原因,采取了行之有效的工艺技术措施并建立了严格的管理制度.通过采取一系列有效措施,使经向疵点得到了控制,棉布下机一等品率由10%提高到45%,棉布入库一等品率由98%提高到99.8%.     

中国气体燃料资源及开发利用前景展望

在经济发展迅猛、能源紧缺、环境恶化等因素的共同驱动下,中国对气体燃料发动机的需求非常紧迫。为此,分析了中国常规天然气、煤层气、垃圾填埋气、页岩气等轻质气体燃料的资源分布、开采及利用状况,认为大量的气体燃料资源储备为中国气体燃料发动机的发展提供了契机。然而,对我国动力行业的发展水平及规模的分析结果表明,目前我国气体燃料发动机的技术水平和制造规模都远远落后于发达国家,缺乏竞争力,满足不了国内市场的需求。进而,对气体燃料的开发利用和气体燃料发动机的发展提出以下建议:1健全煤层气利用设施,推动煤层气产业的发展;2规范市场,优化资源利用比例,提高气体燃料的利用效率;3加快对气体燃料发动机的研究,在中远期能源和动力发展规划中要高度重视我国气体燃料发动机核心关键技术和制造水平的迅速提高;4针对不同的气体燃料,优化气体燃料发动机的性能。     

我国地下饮用水除铁除锰技术研究及应用进展

分析了当前我国现有或有待进一步研究的几种除铁除锰技术的研究及应用情况,并对其技术原理、优缺点等进行了论述与比较,阐明了我国地下饮用水除铁除锰技术的发展前景。     

焦炉硅火泥用天然硅质原料的性能分析及选用

硅质耐火泥在焦炉用耐火材料中与硅砖是同等重要的材料,对焦炉的寿命影响很大。为了使硅质耐火泥能够满足未来超大容积焦炉的使用需要,从配置硅火泥的原料入手,研究了各种因素对硅火泥性能的影响。     

Combined effects of cyclooxygenase-1 and cyclooxygenase-2 selective inhibitors on ovarian carcinoma in vivo

The present study was designed to investigate the combined effects of cyclooxygenase (COX)-1 and COX-2 selective inhibitors on human ovarian SKOV-3 carcinoma cells xenograft-bearing mice. The animals were treated with 3 mg/kg SC-560 (a COX-1 selective inhibitor) alone, 25 mg/kg celecoxib (a COX-2 selective inhibitor) alone, or SC-560/celecoxib by gavage, twice a day for three weeks. To test the mechanism of inhibition of tumor growth by COX selective inhibitors, the index of proliferating cells in tumor tissues was determined by immunostaining and the index of apoptotic cells by the terminal-deoxynucleotidyl-transferase-mediated deoxyuridine triphosphate nick end labeling (TUNEL) method. The inhibitory rate on tumor growth in the combination group was 35.54% which is significant statistically compared with that of the control group (P < 0.05). In the combination group, the index of cell proliferation and apoptosis were 12.40% and 51.03% respectively, which are significant statistically compared with those of the control group (22.56%, 19.07%, all P < 0.05). These studies indicate that synergism between two COX inhibitors and inhibitor combination treatment has particular potential for chemoprevention of ovarian cancer growth.     

Hexafluorozirconic acid based surface pretreatments: Characterization and performance assessment

A new phosphate-free pretreatment from Henkel Corp. named TecTalis^®, was investigated. The treatment bath is composed of dilute hexafluorozirconic acid with small quantities of non-hazardous components containing Si and Cu. The corrosion resistance of treated steel was compared to samples treated in a phosphate conversion coating bath, in simple hexafluorozirconic acid and in TecTalis without the addition of the Cu-containing component. Atomic Force Microscopy (AFM) and Transmission Electron Microscopy (TEM) were used to characterize the coating surface morphology, structure and composition. A Quartz Crystal Microbalance (QCM) was used for studying film growth kinetics on thin films of pure Fe, Al and Zn. Electrochemical Impedance Spectroscopy (EIS) was performed on treated and painted steel for studying long-term corrosion performance of the coatings. The phosphate-free coating provided long-term corrosion performance comparable to that of phosphate conversion coatings. The coatings uniformly cover the surface in the form of 10–20 nm sized nodules and clusters of these features up to 500 nm in size. The coatings are usually about 20–30 nm thick and are mostly composed of Zr and O with enrichment of copper at randomly distributed locations and clusters.