Spectral Properties and Sensitization of Ce3+ and Eu2+ Codoped Calcium Zinc Chlorosilicate

ＳｐｅｃｔｒａｌＰｒｏｐｅｒｔｉｅｓａｎｄＳｅｎｓｉｔｉｚａｔｉｏｎｏｆＣｅ３＋ａｎｄＥｕ２＋ＣｏｄｏｐｅｄＣａｌｃｉｕｍＺｉｎｃＣｈｌｏｒｏｓｉｌｉｃａｔｅＬｉｎＨａｉ（林海），ＬｉｕＸｉｎｇｒｅｎ（刘行仁），ＺｈａｎｇＸｉａｏ（张晓）（Ｃｈａ...     

镧对青枯假单胞菌生长及若干生化性状的影响

单一稀土氧化镧Ｌａ２Ｏ３对青枯假单胞菌的生长有明显抑制作用。当Ｌａ３＋质量浓度为５０,１００,１５０,２００,２５０,３００,３５０ｍｇ／Ｌ时,与对照相比,固体平板上病菌初生长时间延迟,７天后的菌落直径减小,生长量也减少。液体培养中的生物量也比对照显著下降。当Ｌａ３＋质量浓度大于３５０ｍｇ／Ｌ时,病菌停止生长。浓度为２００ｍｇ／Ｌ的Ｌａ３＋明显刺激该病菌的胞外蛋白酶、果胶酶及纤维素酶活性。     

Calculation of RECl_3-CaCl_2-LiCl Phase Diagrams(RE=La, Ce, Pr, Nd)

ＣａｌｃｕｌａｔｉｏｎｏｆＲＥＣｌ_３－ＣａＣｌ_２－ＬｉＣｌＰｈａｓｅＤｉａｇｒａｍｓ（ＲＥ＝Ｌａ，Ｃｅ，Ｐｒ，Ｎｄ）ＱｉａｏＺｈｉ－Ｙｕ（乔芝郁）；ＸｉｎｇＸｉａｎ－Ｒａｎ（邢献然），ＤｕａｎＳｈｕ－Ｚｈｅｎ（段淑贞）（ＤｅｐａｒｔｍｅｎｔｏｆＰｈ...     

Effect of CeCl_3 on the Photosynthetic Characteristics of Spirulina Platensis

ＥｆｆｅｃｔｏｆＣｅＣｌ_３ｏｎｔｈｅＰｈｏｔｏｓｙｎｔｈｅｔｉｃＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＳｐｉｒｕｌｉｎａＰｌａｔｅｎｓｉｓ￥ＣｈｕＺｈｏｎｇ－Ｘｉ；ＭｕＭｅｎｇ－Ｈｕａ；ＺｈａｎｇＨｅ－Ｍｉｎ；ＧａｏＤｅ－Ｌｕ；ＷｕＺｈａｏ－Ｍｉｎｇ（?..     

Study of Temperature Enhancement of the Photorefractive Effect in Ce：Fe：LiNbO_3 Crystal

ＳｔｕｄｙｏｆＴｅｍｐｅｒａｔｕｒｅＥｎｈａｎｃｅｍｅｎｔｏｆｔｈｅＰｈｏｔｏｒｅｆｒａｃｔｉｖｅＥｆｆｅｃｔｉｎＣｅ：Ｆｅ：ＬｉＮｂＯ_３ＣｒｙｓｔａｌＬｉＭｉｎｇｈｕａ（李铭华）；ＷａｎｇＪｉａｃｈａｎｇ（王家昌）；ＸｕＹｕｈｅｎｇ（徐玉恒）；Ｘ?..     

Oxidation Behavior of Fe26Cr1Mo Stainless Steel in the Presence of Ni-La_2O_3 Electrodeposited Composite Film

ＯｘｉｄａｔｉｏｎＢｅｈａｖｉｏｒｏｆＦｅ２６Ｃｒ１ＭｏＳｔａｉｎｌｅｓＳｔｅｌｉｎｔｈｅＰｒｅｓｅｎｃｅｏｆＮｉＬａ２Ｏ３ＥｌｅｃｔｒｏｄｅｐｏｓｉｔｅｄＣｏｍｐｏｓｉｔｅＦｉｌｍＰｅｎｇＸｉａｏ（彭晓），ＺｈｏｕＬｏｎｇｊｉａｎｇ（周龙江），...     

Current Status and Prospeet of Process Research in CISRI

ＣｕｒｒｅｎｔＳｔａｔｕｓａｎｄＰｒｏｓｐｅｃｔｏｆＰｒｏｃｅｓｓＲｅｓｅａｒｃｈｉｎＣＩＳＲＩＹＡＭＧＳｈｕＳｅｎＰｒｏｆｅｓｓｏｒ，ＣｈｉｅｆＥｄｉｔｏｒｏｆＪｏｕｒｎａｌｏｆＩｒｏｎａｎｄＳｔｅｅｌＲｅｓｅａｒｃｈ，Ｖｉｃｅ－ｐｒｅｓｉｄｅｎｔ...     

Effect of CeO_2 on Crystal Structures and Catalytic Properties of the Mn_2O_3 Catalysts

ＥｆｆｅｃｔｏｆＣｅＯ_２ｏｎＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅｓａｎｄＣａｔａｌｙｔｉｃＰｒｏｐｅｒｔｉｅｓｏｆｔｈｅＭｎ_２Ｏ_３ＣａｔａｌｙｓｔｓＬｕｏＭｅｎｇ－Ｆｅｉ（罗孟飞）；ＺｈｕＢｏ（朱波）；ＹｕａｎＸｉａｎ－Ｘｉｎ（袁贤鑫）（Ｃａｔａｌｙ...     

Extended X-ray Absorption Fine Structure Study of Eu-Doped BaPbO_3

ＥｘｔｅｎｄｅｄＸｒａｙＡｂｓｏｒｐｔｉｏｎＦｉｎｅＳｔｒｕｃｔｕｒｅＳｔｕｄｙｏｆＥｕＤｏｐｅｄＢａＰｂＯ３ＣａｉＷｅｉｍｉｎ（蔡伟民），ＦｅｎｇＹｕｊｉｅ（冯玉杰），ＺｈｏｕＤｉｎｇ（周定）（ＤｅｐａｒｔｍｅｎｔｏｆＡｐｐｌｉｃａｔｉｏｎＣｈ...     

Influence of Ga~(3 ) on Photoluminescence of Ce~(3 )

ＩｎｆｌｕｅｎｃｅｏｆＧａ３＋ｏｎＰｈｏｔｏｌｕｍｉｎｅｓｃｅｎｃｅｏｆＣｅ３＋ＸｕＣｈｕｎｘｉａｎｇ（徐春祥），ＬｏｕＺｈｉｄｏｎｇ（娄志东）（ＩｎｓｔｉｔｕｔｅｏｆＭａｔｅｒｉａｌＰｈｙｓｉｃｓ，ＴｉａｎｊｉｎＩｎｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏ...     

Effect of Lanthanum on Growth and Extracellular Enzyme Acitivty of Erwinia Chrysanthemi in vitro

Ａｌｏｎｇｗｉｔｈｔｈｅｌａｒｇｅｓｃａｌｅａｐｐｌｉｃａｔｉｏｎｏｆｒａｒｅｅａｒｔｈｉｎａｇｒｉｃｕｌｔｕｒｅ，ｇｒｅａｔａｍｏｕｎｔｏｆｒａｒｅｅａｒｔｈｃｏｍｐｏｕｎｄｓｅｎｔｅｒｅｄｅｎｖｉｒｏｎｍｅｎｔｔｏｒｅｓｕｌｔｉｎａｃｕｍｕｌａｔ...     

Ni2+、Cu2+、Zn2+对氧化亚铁硫杆菌氧化 活性影响

为研究金属离子对氧化亚铁硫杆菌（Acidithiobacillus ferrooxidans,At.f）氧化活性的影响,通过测定经初步驯化的At.f菌在不同初始pH下的生长活性,开展不同浓度梯度的Ni2+、Cu2+、Zn2+及三种金属离子共存时对At.f菌的氧化活性影响的试验。结果表明,当初始pH为1.8时,At.f菌生长活性最好,且低浓度的Ni2+、Zn2+对At.f菌氧化活性影响较小,对两种金属离子的耐受浓度均在20 g/L以上;而该细菌对Cu2+比较敏感,当Cu2+浓度为2.5 g/L时,菌株的生长活性明显下降,特别是10 g/L时,对At.f菌的氧化能力有显著的抑制作用。三种金属离子同时存在时对At.f菌氧化活性的影响大于单一金属离子,当三种金属离子的浓度均为2.5 g/L时,在48小时内对At.f菌的氧化能力有显著的抑制作用,当三种金属离子的浓度均为5 g/L时,80小时时菌株对Fe2+的氧化率极低,说明At.f菌需要经过多种金属离子共存驯化培养后才能更好地运用于多金属复杂矿物的处理。     

Stimulatory effect of cooling tower biocides on amoebae

Two species of amoebae were isolated from the cooling tower of an air-conditioning system and examined for effects of exposure to four cooling tower biocides, a thiocarbamate compound, tributyltin neodecanoate mixed with quaternary ammonium compounds, another quaternary ammonium compound alone, and an isothiazolin derivative. The amoebae isolated were Acanthamoeba hatchetti and a Cochliopodium species. Two other amoeba cultures, an A. hatchetti culture and Cochliopodium bilimbosum, were obtained from the American Type Culture Collection (ATCC) and were also tested. The cooling tower isolates were more resistant to most of the biocides than the ATCC isolates were. The isothiazolin derivative was the least inhibitory to all four amoeba isolates, and tributyltin neodecanoate mixed with quaternary ammonium compounds was the most inhibitory to three of the four isolates. After exposure to lower concentrations of the biocides, including for one strain the manufacturer's recommended concentration of one biocide, the cooling tower amoeba populations increased significantly compared with unexposed controls, whereas the ATCC isolates were not stimulated at any of the concentrations tested. In some cases, concentrations which stimulated cooling tower amoebae inhibited the growth of the ATCC isolates. These results suggest that cooling tower amoebae may adapt to biocides, underscoring the need to use freshly isolated cooling tower organisms rather than organisms from culture collections for testing the efficacy of such biocides. The stimulatory effect of biocides on amoeba populations is an alarming observation, since these organisms may be reservoirs for legionellae. Biocides used to control microbial growth may actually enhance populations of host organisms for pathogenic bacteria.     

Other methods of laparoendoscopic hernia repair: mini-hernia--inguinal hernia repair through a 2-cm incision

Ruminal lactic acid-producing bacteria were selectively isolated and enumerated using a one hour aerobic exposure prior to incubation on a semi-selective Lactobacillus medium, MRS, under anaerobic conditions. The technique allowed growth of pure cultures of ruminal Lactobacillus spp. and Streptococcus bovis without supporting the growth of pure cultures of any of the prominent ruminal bacterial species. In mixed cultures, the one hour aerobic pre-incubation inhibited the growth of the obligate anaerobic ruminal bacteria which can otherwise grow on the MRS medium, and the subsequent anaerobic incubation permitted maximal recovery of the weakly aerotolerant ruminal lactic acid-producing Lactobacillus spp. and Streptococcus spp. The efficacy of this technique in selecting exclusively for the lactic acid-producing bacteria was also demonstrated from populations of rumen bacteria from mixed culture end-point in vitro fermentation, continuous in vitro culture and isolations from fresh ruminal samples.     

以铀矿渣为载体联合PEG2000的细菌固定化培养

以铀矿渣为载体,采用逐次降低接种率循环培养的方法,开展了氧化亚铁硫杆菌的固定化培养试验,研究了聚乙二醇2000（PEG2000）对游离细菌和铀矿渣载体柱中固定化细菌生长的影响。试验结果表明：90 mg/L PEG2000对游离细菌的生长促进作用最大。铀矿渣和K3环材料均可作为载体进行细菌固定化培养。固定化完成时,其亚铁离子的平均氧化速率分别稳定在0.6和0.5 g/(L?h)附近。90 mg/L PEG2000对循环培养和连续培养阶段的固定化细菌生长均具有促进作用。循环培养阶段,可使Fe2+氧化为Fe3+的时间缩短约1/3。连续培养阶段,PEG2000能够促进固定化细菌对亚铁离子的氧化速率,在0.5 L/h进液流量时,未加PEG2000的亚铁离子氧化速率为7.04 g/(L?h),而加PEG2000的,达到了8.18 g/(L?h),亚铁离子氧化效率提高了16.2%。     

Effects of laidlomycin propionate and monensin on glucose utilization and nutrient transport by Streptococcus bovis and Selenomonas ruminantium

The objective of this study was to compare the effects of laidlomycin propionate and monensin on cell growth, glucose fermentation, and glucose uptake in Streptococcus bovis strain JB1 and Selenomonas ruminantium strain HD4. Experiments were also conducted to compare the effects of both ionophores on sodium-dependent serine transport and cell yield in S. bovis. Batch cultures (500 mL) of each bacterium were grown on 3.6 g/L D-glucose in semidefined medium and treated with either 5 ppm monensin or 2 ppm laidlomycin propionate (n=2). Cell growth was monitored by measuring optical density at 600 nm (OD600). Glucose and L-lactate concentrations were measured using coupled enzyme assays. In S. bovis, both monensin and laidlomycin propionate decreased OD600, glucose utilization, and L-lactate production. Neither ionophore had any effect on glucose utilization by S. ruminantium. [14C]Glucose uptake between 5 and 30 min by both bacteria was not altered by either ionophore. Sodium-dependent [14C]serine uptake by S. bovis was inhibited by monensin but not laidlomycin propionate. When S. bovis was grown in glucose-limited continuous culture (dilution rate=.10 h(-1)) at extracellular pH 6.7, increasing concentrations of both ionophores decreased bacterial yield, and both ionophores were more potent at an extracellular pH of 5.7. However, monensin was a more potent inhibitor than laidlomycin propionate at pH 6.7 and 5.7. Collectively, these results suggest that the ionophore laidlomycin propionate inhibits the Gram-positive bacterium S. bovis in a manner similar to that of monensin, but, at the concentrations used in this study, laidlomycin propionate seems to be less potent than monensin in inhibiting serine uptake and cell yield.     

In vitro activity of the new fluoroquinolone CP-99,219

The in vitro activity of the new fluoroquinolone CP-99,219 [7-(3-azabicyclo[3.1.0]hexyl)naphthyridone] was compared with those of four other quinolones against 541 gram-negative, 283 gram-positive, and 70 anaerobic bacterial isolates. CP-99,219 inhibited 90% of many isolates in the family Enterobacteriaceae at a concentration of < or = 0.25 micrograms/ml (range, < 0.008 to 1 microgram/ml), an activity comparable to those of tosufloxacin and sparfloxacin and two times greater than that of temafloxacin. Ninety percent of the Proteus vulgaris, Providencia rettgeri, Providencia stuartii, and Serratia marcescens isolates were inhibited by 0.5 to 2 micrograms of CP-99,219 per ml. CP-99,219 inhibited 90% of the Pseudomonas aeruginosa and Haemophilus influenzae isolates at 1 and 0.015 micrograms/ml, respectively. The compound inhibited methicillin-susceptible Staphylococcus aureus at 0.06 micrograms/ml, whereas a ciprofloxacin concentration of 1 microgram/ml was required to inhibit these organisms. CP-99,219 inhibited 90% of methicillin-resistant S. aureus isolates at a concentration of < or = 4 micrograms/ml, while ciprofloxacin and temafloxacin had MICs against these isolates of > 16 micrograms/ml. Streptococci were inhibited by < or = 0.25 micrograms/ml, an activity comparable to that of tosufloxacin. CP-99,219 was eight times more active than ciprofloxacin against Streptococcus pneumoniae. Bacteroides species were inhibited by CP-99,219 at a concentration of 2 micrograms/ml, whereas inhibition of these species required 4- and 16-microgram/ml concentrations of tosufloxacin and ciprofloxacin, respectively. The MBCs of CP-99,219 ranged from two to four times the MICs, and inoculum size had a minimal effect on MIC. CP-99,219 was active against P. aeruginosa at pH 5.5, with only a fourfold increase in MIC compared with values obtained at pH 7.5. The addition of up to 9 mM Mg(2+) increased the MIC range from 0.03 to 0.06 microgram/ml to 0.12 to 0.5 microgram/ml. In view of its excellent in vitro activity against both gram-positive and gram-negative bacteria, CP-99,219 merits further study to determine it's clinical pharmacologic properties and potential for therapeutic use.     

Studies on interactions between metmyoglobin and heparin

Butyric acid is released from milk by pre-intestinal lipases during suckling. It is also known to inhibit bacterial growth. To investigate whether butyric acid may be a significant factor in controlling bacterial growth in the stomach of pre-weaned animals, the ability of butyric acid to inhibit growth of selected bacteria was tested over physiological ranges of pH and butyric acid concentrations. Six enteric and environmental strains of bacteria were used: two strains of Escherichia coli, Klebsiella pneumoniae, Enterococcus faecium, Enterococcus faecalis, and Enterococcus casseliflavus. At pH 4.5 and 5.0, the growth of all organisms was significantly inhibited in the presence of butyrate, and in some cases growth was completely arrested. At pH 6.0, butyric acid did not affect bacterial growth until the concentration reached 40 mM. The maximum concentration of butyric acid available in cow's milk after incubation with pre-gastric lipase is approximately 16 mM, which would be sufficient to prevent growth of the organisms tested at pH values occurring in the stomach. Therefore, butyric acid inhibition of bacterial growth may explain in part, the role of pre-intestinal lipases in young animals' natural defenses against bacteria in ingested food prior to weaning.     

Halogenated anesthetics inhibit Pseudomonas aeruginosa growth in culture conditions reproducing the alveolar environment

We assessed the effects of halogenated anesthetics on Pseudomonas aeruginosa growth in a liquid nutrient broth. Sterile Petri dishes (3.5-cm diameter) were filled with a 1-mL suspension of a Pseudomonas aeruginosa strain and incubated at 37 degrees C. Exposure of bacterial plates to halothane, isoflurane, and enflurane administered at 1 and 2 minimum alveolar anesthetic concentration (MAC) were studied for different exposure times (1, 2, 3, and 4 h) using an airtight chamber. For each time, a control point was obtained. Serial dilutions and agar plates were made, and developed colonies were counted. A significant decrease in bacterial growth was observed from the second hour of exposure to every halogenated anesthetic. For long periods of exposure (3 and 4 h), bacterial growth was significantly reduced in the plates exposed to 2 MAC compared with 1 MAC. The maximal inhibition was observed after a 4-h exposure at 2 MAC and reached 60%, 49%, and 42% for halothane, isoflurane, and enflurane, respectively. We conclude that a decrease in Pseudomonas aeruginosa growth is observed after exposure to halogenated anesthetics, but whether this inhibition is clinically important remains to be demonstrated. Implications: Bacterial pneumonia is a major source of morbidity after general anesthesia. We measured the effects of volatile anesthetics on the growth of Pseudomonas aeruginosa, one of the pathogens most often isolated in hospital-acquired pneumonia. The experiments were performed in vitro in culture conditions reproducing those observed in the alveolar space. Volatile anesthetics inhibited the growth of these bacteria, but the clinical significance of this fact remains to be determined.