过氧戊二酸对大肠杆菌噬菌体f2杀灭机理

观察结果表明过氧戊二酸对大肠杆菌噬菌休ｆ２有较强的杀灭作用，并影响其吸附特性和感染能力。电镜观察表明过氧戊二酸处理后的ｆ２颗粒聚集成团、变形破碎或残缺不全，这可能是ｆ２灭活的主要原因。     

Glutamine and Other Amino Acid Losses During Continuous Venovenous Hemodiafiltration

Abstract: Serum amino grams and daily losses of glutamine (Gin) and other amino acids (AAs) into diafiltrate were measured during the first 5 days of continuous venovenous hemodiafiltration (CVVHDF) in 6 ICU patients with acute renal failure (ARF). Four patients had ARF as a part of multiple organ failure (MOF) of septic origin, and 2 patients had isolated ARF because of primary renal disease. During the study, all the patients received defined total parenteral nutrition (TPN). The mean daily AA losses into dialysate were relatively low (0.61 ± 0.1 g N ) and reached 4.5% of the daily AA substitution. Gln represented 32.7 ± 5.9% of the total AA losses (0.19 ± 0.04 g N ). Serum levels of Gin (p = 0.002) and of most other AAs were significantly lower in the patients than in the control subjects (AA analysis in 16 healthy volunteers). Phenylalanine (Phe) was the only AA that was increased significantly (p < 0.01) in the patients. The mean patient serum concentrations of Phe and tyrosine were significantly higher (p < 0.03) than the correspondent concentrations in dialysate, but the lysine concentration was higher in dialysate (p < 0.03). The serum and dialysate concentrations of other AAs did not differ. Gin in serum decreased significantly (p < 0.03) on the second day of CVVHDF but returned to the baseline levels subsequently. Serum concentrations of Phe increased on the second day of CVVHDF (p < 0.05). Serum concentrations of other AAs remained stable during the whole study. We conclude that Gin losses into dialysate during CVVHDF are relatively low, but CVVHDF itself may induce changes in Gin metabolism and distribution that are reflected by a decrease of serum Gin levels at the institution of this treatment. Therefore, the need for Gin supplementation in ICU patients is even greater in the first days of CVVHDF.     

Involvement of glutamate receptors,lipases, and phospholipases in long-term potentiation and neurodegeneration

Glutamate is the primary excitatory amino acid in the mammalian central nervous system. Normal excitation of glutamate receptors initiates the stimulation of phospholipases and lipases with the generation of second messengers that are necessary for normal cell function. The overstimulation of glutamate receptors can initiate a cascade of biochemical events including stimulation of membrane phospholipid turnover, excessive calcium entry, abnormal phosphorylation, and proteolysis. These events may be responsible for neuronal injury and degeneration found in Alzheimer disease, ischemia, spinal cord trauma, epilepsy, and Huntington disease.     

妊娠期肝内胆汁淤积症与血清甘胆酸的关系

检测了７４例正常足月妊娠妇女和５６例妊娠期肝内胆汁淤积症（ＩＣＰ）患血清甘胆酸（ＣＧ）的浓度，结果ＩＣＰ患血ＣＧ浓度显升高（１３．５２±９．５４ｍｇ／Ｌ），为正常孕妇（２．６７±１．９２ｍｇ／Ｌ）的５～１０倍，根据血ＣＧ浓度将ＩＣＰ患分为〈１０、１０～２０，〉２０ｍｇ／Ｌ３组，将３组胎儿出生情况与正常组相对照，结果显示血ＣＧ浓度〈１０ｍｇ／Ｌ组羊水胎粪污染率及新生儿窒息率与正常组无差异，而     

78例胃窦癌的治疗分析

自１９８８年２月至１９９２年８月期间手术治疗的７８例胃窦癌患者进行了回顾性分析，手术后肿瘤复发的情况，与十二指肠断端有无癌细胞残存密切相关，并发现于幽门环下切断十二指肠少于３ｃｍ者有癌细胞残存达３４％，切除十二指肠达３ｃｍ者，无论肿瘤分化程度如何，恶性程度高低，切除断端均无癌细胞残存，手术后辅以化疗，对于病人的预后有一定提高。本组随访到的５９例病人中，接受化疗的３３例，在２年３个月至６年１个月内死亡７例（２１．２％），未接受化疗的２６例，在５个月至３年８个月内死亡的２６例，在５个月至３年８个月内死亡９例（３５％）。     

Oxidative breakdown of octanoic acid is maintained in patients with cirrhosis despite advanced disease

As an octanoic acid 13CO2 breath test is frequently used to test gastric emptying of solid food, the purpose of the present study was to study whether oxidative breakdown of octanoic acid is affected by severe liver disease. The design of our study was twofold. First, cirrhotic patients (n = 82) of varying severity were compared with healthy controls (n = 17). Values of half-time, time point of maximal expiration and cumulative recovery of octanoic acid breath tests (OBT) were not significantly different between them. Secondly, cirrhotic patients (n = 10) were studied before placement of transjugular intrahepatic portosystemic shunt, 4-7 days later and 1-2 months later. Values of half-time, time point of maximal expiration and cumulative recovery of consecutive OBTs did not change significantly. The OBT may therefore be a suitable test in the future to detect delayed gastric emptying of solids in cirrhotic patients with reduced liver function and portal hypertension.     

Effect of various stabilizing agents on Imperata cylindrica grass pollen allergen extract

BACKGROUND: Allergen extracts are unstable, heat labile or susceptible to proteases. Stability of allergen extracts is important for proper diagnosis and therapy of allergic disorders. OBJECTIVE: The present study was undertaken to determine the preservation and stabilization conditions of Imperata cylindrica (Ic) grass pollen extract. METHODS: The Ic extract was kept with 0.1 mepsilon-aminocaproic acid (EACA), 0.75 m sucrose, 5% glycerol, 0.03% human serum albumin (HSA) or 0.4% phenol for different time periods. The extracts were stored for 3, 6 and 12 months each at 4 degrees C, 4 degrees C with daily exposure to room temperature (RT) for 1 h, and RT. The quality of extracts was analysed by SDS-PAGE, Western blot, ELISA, ELISA inhibition and skin test. RESULTS: Extracts kept with EACA and sucrose retained most of the protein bands followed by glycerol as determined by SDS-PAGE and Western blot during all storage periods and conditions in comparison with standard extracts. The extracts kept with HSA, phenol and without preservative (WP) showed protein degradation below 33 kDa after 3 months storage at all conditions. However, a 67-kDa allergen was stable in these extracts. EACA extract required 75 to 120 ng of protein for 50% inhibition in IgE binding under different conditions, whereas standard extract required 70 ng for the same. ELISA also demonstrated high allergenic reactivity of EACA extract. ID test on allergy patients with EACA extract demonstrated same allergenic potency as that of standard extract. CONCLUSION: EACA is the best preservative/stabilizing agent of Ic pollen extract, followed by sucrose and glycerol. Ic extract kept with phenol, HSA and without preservative showed degradation within 3 months. EACA preserved extract is equally potent as that of standard extract up to 1 year's storage.     

某钢铁厂工艺改进前后金属酸洗岗位职业危害的对比

目的了解工艺改进后金属酸洗岗位职业危害因素及浓度降低效果，控制岗位人员职业危害因素接受量，预防职业病的发生。方法通过对某钢铁厂金属酸洗车间工艺改进前后酸洗和天车操作两个岗位职业危害因素监测结果进行对比、分析，确定工艺改进对控制岗位职业危害的效果。结果天车操作室：硫酸雾合格率由60．2％上升到88．9％，盐酸雾合格率由63.0％提高到100％；酸洗操作岗位：硫酸雾合格率由37．0％上升到87．9％，盐酸雾合格率由49．0％提高到99．1％。经统计学分析，工艺改进前与工艺改进后硫酸雾、盐酸雾总体合格率差异均有显著性（P〈0．05），说明工艺改进后主要岗位职业危害因素减低的合格率均有较大提升。结论工艺改进对控制酸洗岗位职业危害效果明显。     

Cluster headache: phospholipid metabolism in polymorphonuclear cells

Our group has previously reported significant changes in the incorporation of precursors into glycerophospholipids, particularly phosphatidylserine, in polymorphonuclear cells obtained from the peripheral blood of cluster headache patients, when compared with controls. The potential of these results led to further work using both the previous methodology and a modified isolation technique to obtain polymorphonuclear cells in as pure a state as possible. Neither the new results obtained using the original technique, nor the results with high purity polymorphonuclear cells from controls and cluster headache patients, confirm the marked changes in precursor uptake into glycerophospholipids originally reported.     

A Comparative Study on the Effect of BCG-PSN and Thymopeptides on T-lymphocyte Subsets of Normal and Immunosuppressed Mice

Polysaccharidenucleicacidfractionofbacilluscalmetteguerin (BCG PSN ,SiqikangInjection)andthymopeptidesarenowtwowidelyusedimmunomod ulatorsinclinicalpractice .Theyareusuallyusedasanadjuvanttherapyforvirusinfection ,autoimmunediseasesandneoplasms ,whichhavebeenclinicallyprovedtobeeffective .Somereportsdemonstratedthattheybothcanstimulatetheproliferationanddif ferentiationofT lymphocytes.However ,theexactmechanismshavenotbeenelucidatedyet .InordertocomparetheirmodulatingmechanismsonT lympho c…