时政; 韩承华; 黄凯丰
Thirty five portions of tartary buckwheat resource from different origin were used as experimental material to determine the total amylum content,amylose and amylopectin content. The amylum content of 35 portions of tartary buckwheat varied from 40. 70％ to 86. 41％ with an average of 62. 80％ ; The amylose content of 35 portions of tartary buckwheat varied between 12. 24％-32. 18％ with an average of 19. 32％ ;The amylopectin content of 35 portions of tartary buckwheat varied between 13. 31％ -68 78％ with an average of 43. 48％. The amylum content is higher,amylopectin content is the highest. There was difference among different origin of tartary buckwheat. The results of this study had important significance for further study on the genetic variation law of amylum content between different tartary buckwheat resources.%以不同原产地的35份苦养资源为试验材料,测定了其籽粒中的总淀粉、直链淀粉、支链淀粉的含量.结果表明,35份苦养资源的总淀粉含量变化幅度为40.70%～86.41%,平均值为62.80%;直链淀粉含量的变异幅度为12.24%～32.18%,平均值为19.32%;支链淀粉含量的变异幅度为13.31%～68.78%,平均值为43.48%.苦荞中淀粉含量较高,以支链淀粉为主.不同产地的苦荞种子中总淀粉、直链淀粉、支链淀粉含量存在差异.
The N,N'-Methylenebisacrylamide was used as crosslinking agent and the potassium persulfate was used as initiator to copolymerization and cross -linking of collophanite, amylum and acrylate by using aqueous solution polymerization method to prepare a kind of coating material with water retention and phosphor containing for coating slow release urea fertilizer. When mass fraction of phosphorite was 14%, the water absorption amount of the coating material was 560 g/g for deionized water and 254 g/g for tap water, while the slow release period of coated urea was 65 d. Therefore, the coating material meets the technological standards of GB/T23348-2009.%采用水溶液聚合法,以N,N’-亚甲基双丙烯酰胺为交联剂,过硫酸钾为引发剂,使胶磷矿、淀粉与丙烯酸盐共聚交联,制备了一种兼具保水性的含磷缓释肥包膜材料并应用于包衣尿素缓释肥.磷矿质量分数为14％时,材料在去离子水、自来水中的吸水率分别为560 g/g、254 g/g,包衣尿素的缓释周期为65 d,符合GB/T23348-2009规定的缓释要求.
Meijer, H.J. [TNO Milieu, Energie en Procesinnovatie TNO-MEP, Apeldoorn (Netherlands)
Amylum Netherlands in Koog aan de Zaan, Netherlands, produces amylum and glucose syrup. The amylum dryers consume a large amount of energy. Two dryers were modified and partly make use of hot flue gases from the cogeneration installation. The results of the modifications are discussed. [Dutch] AmyLum Nederland in Koog aan de Zaan produceert zetmeet en glucosestroop. De zetmeeldrogers zijn de grote energieverbruikers in het productieproces. Twee van deze drogers zijn gemodificeerd en gebruiken als droogmedium gedeeltelijk hete rookgassen uit de aanwezige WKK. De gevolgen van deze aanpassing voor de bedrijfsvoering van de drogers en de WKK passeren de revue.
Ti(C,N) was synthesized with the starting materi-als of 76.9% titania white and 23.1% carbon black (graphite or activated carbon),or 40% titania white and 60% amylum,with or without 10% NaBr-KCI,dry moulding and carbon embedded firing at 1 300 ℃ and 1 400 ℃ for 3 h,respectively.Phase composition and microstructure of the synthesized Ti (C,N) were analyzed by XRD,SEM and EPMA.Effects of different carbon sources and NaBr-KCl on the synthesis of Ti (C,N) were investigated.The results show that:(1) Ti (C,N) can be synthesized by using carbon black,graphite,activated carbon or amylum as carbon source separately;(2) Additive NaBr-KCI is more fa-vorable for accelerating the carbothdrmal reduction reac-tion using carbon black or amylum as carbon source;(3) In the presence of NaBr-KCl,particle size of the synthesized Ti (C,N) is 5-8 μm using carbon black as carbon source fired at 1 300 ℃ for 3 h,while that is only 1-3 μm using graphite,activated carbon or amy-lum fired at 1 400 ℃ for 3 h.
Full Text Available The use of polymeric pack has made for many important problems. Biodegradable plastics may provide solutions to global environmental problems. The aim of this study is to examine the utilization possibilities in natural environment of biodegradable films, which was developed with polyvinyl alcohol and organic filler materials (amylum and cellulose. The films stability against the filamentous fungus was analyzed, the soil type with optimal conditions to the biodegradation of polymers was determined; the mold fungi were separated from biodegradable films and were identified to a genus.
Rhodopseudomonas XL-1 gained from textile wastewater can effectively decolorize anthraquinone dye. Under anaerobic condition, 93 percent of the anthraquinone dye is decolorized , which is higher than that under aerobic condition. The optimum pH is 6～9 and the optimum temperature is 20～40℃ for the anthraquinone dye decolorization by XL-1 . XL-1 can not decolorize the anthraquinone dye when it is the sole carbon source. Microbial cometabolism and decolorization of the dye take place in the presence of some other carbon source(0.2～0.4g/100ml)called cometabolic substrate. The cometabolic substrate can be peptone, glucose, sodium acetate, beef extract, amylum, etc. The change of molecular structure of the dye before and after decolorized by XL-1 is studied by UV-Vis absorption spectrum. The results indicate that its molecular structure is changed evidently.
NINING NURUL AZIZAH
Full Text Available Fluorescent pseudomonass isolated from local plants-rishosphere in temanggung controlled lincat disease of tobacco. This report describe phenotypic charactheristics of the bacteria in order to be used as a base for the development of the bacteria as a biological control agent of lincat disease. Phenotypic charactheristics of six isolates of fluorescent Pseudomonass which controlled lincat disease in the field were determined in the laboratory of Plant Bacteriology, Faculty of Agriculture, Gadjah Mada University. Plant pathogenicity tests were conducted by hypersensitive reaction into tobacco leaf and inoculation to tobacco plants. Antagonism test between fluorescent Pseudomonass and other candidate of biological control agents were also conducted. The results indicated that the bacteria were rod shape, Gram negative, positive reaction in catalase and oxidase tests. Nitrate reduce to nitrite, arginine was hydrolysed, fluorescent pigment were produced on King’s B medium, levan formation positive and all bacteria denitrifiy. The bacteria used urea, tween 80 and amylum were not hydrolised, poly--hydroxybutyrate was not accumulated in the cells. Negative reactions were observed for lysine decarboxylation, indol production, VP/MR reaction, and gelatn liquefation. Some compounds could be used as solely carbon sources. All isolates grew on the medium containing 2% NaCl. The best pH for growth was 6-7 and all isolates grew at 20-41C. Negative result were obtained for hypersensitive reaction and pathogenicity tests.
张文学; 管珊红; 孙刚; 胡水秀; 彭春瑞; 李祖章; 刘光荣
在早稻始穗期及齐穗后一周内叶面喷施4种外源激素复配剂,研究了它们对早稻产量、强弱势粒中蔗糖、淀粉积累的影响,并用Richards方程对不同粒位的灌浆过程进行统计回归分析.结果表明:4种复配剂均提高了籽粒灌浆速率,促进了蔗糖转化、淀粉积累,提高了结实率、充实度和产量.与对照相比,喷施外源激素使强、弱势粒的生长终值量分别提高1.77％～2.52％和8.03％ ～22.49％；强、弱势粒的起始生长势分别提高0.29％ ～6.56％和3.74％ ～26.06％；强、弱势粒的最大灌浆速率分别提高5.86％～16.12％和4.63％～27.38％；强、弱势粒的平均灌浆速率分别提高2.78％～17.64％和6.08％ ～18.12％.外源激素对弱势粒的灌浆特性影响较强势粒大.4种复配剂对早稻的增产效果为GA3+6- BA+ BR＞ GA3+ BR＞6 - BA+ BR＞ GA3 +6 - BA,其中,GA3+6- BA+ BR增产高达9.14％.%To clarify the effects of 4 kinds of exogenous phytohormone compounds (PCs) on the yield, sucrose and amylum accumulation in grain of early rice, an experiment was conducted by spraying exogenous PCs at the initial heading stage and full heading stage, and the experimental data were simulated and analyzed with Richards equation. The results indicated that spraying 4 kinds of exogenous PCs all enhanced the grain - filling rate, accelerated the transformation of sucrose and accumulation of amylum, increased seed setting rate, grain plumpness and yield. As compared with the control, the treatments of spraying PCs enhanced the growth capacity of superior grains and inferior grains by 1.77% ～ 2.52% and 8.03% ~ 22.49% respectively, the initial grain - filling potential of superior grains and inferior grains by 0.29% ～ 6.56% and 3.74% ~ 26.06% respectively, the maximum grain - filling rate of superior grains and inferior grains by 5. 86% ~ 16. 12% and 4. 63% ～ 27. 38% separately, and the mean grain - filling rate of superior grains
刘小真; 梁越; 汪月华
Objective To explore the method of high concentration ozone based on alkalinity potassium iodide colorimetric method. Methods Based on alkalinity potassium iodide colorimetric method,the analysis method of high concentration ozone from O3 generator was studied, which included dilution of ozone (O3) samples, selection of diluent, and the relationship between different extent of dilution and analysis result. Results The ozone (O3) samples with high concentration transformed into iodine (I2) samples with high concentration after reaction with potassium iodide and acidification. Then the minimum dilutability of the thinning iodine samples with high concentration not producing suspended matter after adding in amylum was found out by pre-experiment. In formal experiment, color development adding amylum into the iodine samples would be done under the condition of slightly greater than the dilutablity, and the color solution would be diluted. Under the precondition of decreasing dilution mulriple, the color development solution would be diluted to the 3th-6th tubes of standard color comparison tube ,which would be helpful to get accurate data. Conclusion This method is applicable to the determination of high concentration ozone.%目的 探讨一种基于碱性碘化钾比色法的高浓度臭氧(O3)分析方法.方法 基于碱性碘化钾比色法,从臭氧样品的稀释、稀释剂的选择以及不同的稀释度与分析结果之间的关系等方面,对O3供源所产生的高浓度臭氧分析方法进行了研究.结果 高浓度O3样品与碘化钾反应及酸化后形成高碘样品,在预实验基础上,找出某一高碘的稀释样品在加淀粉后不产生悬浮物的最小稀释度;正式实验时,在略大于该稀释度的条件下,加淀粉显色,再对显色溶液进行稀释,在减少稀释倍数的前提下,尽量将此显色溶液稀释到标准色列管的第3～6管之间,测定结果准确.结论 该方法能较好地分析高浓度O3供源所产生的臭氧浓度.
Tan, Zhilei; Wang, Hongcui; Wei, Yuqiao; Li, Yanyan; Zhong, Cheng; Jia, Shiru
Gluconobacter oxydans is known to oxidize glucose to gluconic acid (GA), and subsequently, to 2-keto-gluconic acid (2KGA) and 5-keto-gluconic acid (5KGA), while 5KGA can be converted to L-(+)-tartaric acid. In order to increase the production of 5KGA, Gluconobacter oxydans HGI-1 that converts GA to 5KGA exclusively was chosen in this study, and effects of carbon sources (lactose, maltose, sucrose, amylum and glucose) and nitrogen sources (yeast extract, fish meal, corn steep liquor, soybean meal and cotton-seed meal) on 5KGA production were investigated. Results of experiment in 500 mL shake-flask show that the highest yield of 5KGA (98.20 g/L) was obtained using 100 g/L glucose as carbon source. 5KGA reached 100.20 g/L, 109.10 g/L, 99.83 g/L with yeast extract, fish meal and corn steep liquor as nitrogen source respectively, among which the optimal nitrogen source was fish meal. The yield of 5KGA by corn steep liquor is slightly lower than that by yeast extract. For the economic reason, corn steep liquor was selected as nitrogen source and scaled up to 5 L stirred-tank fermentor, and the final concentration of 5KGA reached 93.80 g/L, with its maximum volumetric productivity of 3.48 g/(L x h) and average volumetric productivity of 1.56 g/(L x h). The result obtained in this study showed that carbon and nitrogen sourses for large-scale production of 5KGA by Gluconobacter oxydans HGI-1 were glucose and corn steep liquor, respectively, and the available glucose almost completely (85.93%) into 5KGA.
郭英超; 李燕玲; 王子岚; 杜克久
In order to discuss the cuttings rooting mechanism and to enhance the rooting rate of Sabina davurica (Pall.) Ant, the variations of the content of the water and nutrient components in twig cuttings were analyzed during the rooting process after treated with different endogenous hormones. The results show that the water and the soluble carbohydrate increased first and decreased later during the rooting process. The content of the soluble amylum presented a single peak curve, the soluble protein was a typical bi-modal curve. The plant hormones treatment promoted nutrient components transformation. All the changes were good for cuttings root-ing.% 为了提高兴安圆柏扦插生根率，探讨兴安圆柏的扦插生根机理，本试验采取不同激素处理兴安圆柏嫩枝插穗，分析嫩枝插条内水分及营养物质含量变化。结果表明，插穗生根过程中，水分、可溶性糖都是先降低后升高的过程，可溶性淀粉变化呈现升-降的单峰曲线，可溶性蛋白变化为升-降-升-降的双峰曲线。激素处理促进插穗内营养物质的转化，促进插穗生根。
Suitability of thermoluminescence, chemiluminescence, ESR and viscosity measurements as detection method for the irradiation of medicinal herbs; Eignung von Thermolumineszenz-, Chemilumineszenz-, ESR- und Viskositaetsmessungen zur Identifizierung strahlenbehandelter Arzneidrogen
Schuettler, C.; Gebhardt, G.; Stock, A.; Helle, N.; Boegl, K.W.
Chemiluminescence, electron spin resonance, thermoluminescence and viscosity measurements have been investigated for their suitability as detection method for the irradiation of the medicinal herbs anise seeds (anisi fructus), valerian roots (valerianae radix), redberry leaves (uvae ursi folium), birch leaves (betulae folium), greek hay seeds (foenugraeci semen), cayenne pepper (capsici fructus acer), black-aldertee bark (frangulae cortex), fennel fruits (feoniculi fructus), rose hip shells (cynosbati fructus), coltsfoot (farfarae folium), acorus roots (calami rhizoma), chamomile flowers (matricariae flos), caraway (carvi fructus), lavender flowers (lavandulae flos), linseed (lini semen), lime tree flowers (tiliae flos), St. Mary`s thistle fruit (cardui mariae herba), lemon balm (melissae folium), java tea (orthosiphonis folium), peppermint (menthae piperitae folium), sage leaves (salviae folium), scouring rush (equiseti herba), senna leaves (sennae folium), plantain herbs (plantaginis lanceolata herba), thyme herbs (thymi herba), juniper berries (juniperi fructus), hawthorne herbs (crataegi folium), wheat starch (amylum tritici) and wormwood (absinthii herba). Depending on the herbs, the methods used were more or less suitable. Chemiluminescence measurements showed the smallest differences between untreated and irradiated samples whereas thermoluminescence measurements on isolated minerals from the vegetable drugs gave better results. In some herbs radiation-specific radicals could be identified by ESR spectroscopy. Viscosity measurement is suitable for some herbs as fast and inexpensive method for screening. (orig.) [Deutsch] Die Eignung von Chemilumineszenz-, ESR-, Thermolumineszenz- und Viskositaetsmessungen als Nachweismethode fuer die Behandlung von Arzneidrogen mit ionisierenden Strahlen wurde an Anis, Baldrianwurzel, Baerentraubenblaettern, Birkenblaettern, Bockshornsamen, Cayennepfeffer, Faulbaumrinde, Fenchel, Hagebuttenschalen, Huflattichblaettern
卢辛成; 蒋剑春; 孟中磊; 孙康; 谢新苹
Formed biomass charcoal was prepared by powder charcoal from biomass. The influences of category, dosage of adhesive and temperature of the heat treatment on the properties of the formed biomass charcoal were studied. It was found that formed biomass charcoal prepared using carboxymethylcellulose as an adhesive has a better performance than that from amylum. The optimum technological process is that the dosage of adhesive is 6 % and heat treatment at 200℃ for one hour. Physical and chemical properties of the formed charcoal were also studied. The results showed that the formed biomass charcoal has the fixed carbon content of 88.95 % , heat value of 30.6 kJ/g and abrasion resistance of 99. 83 % .%以生物质炭粉为原料制备成型炭燃料,考察了黏结剂种类、用量以及热处理温度对成型炭性能的影响.结果表明:羧甲基纤维素用作黏结剂制备得到的成型炭性能优于以淀粉为黏结剂制备的成型炭,并且得到最优的工艺条件为黏结剂添加量为6％,在200℃下热处理1h.测定了制备得到的成型炭的理化性能,其固定碳质量分数可达到88.95％,热值为30.6 kJ/g,强度为99.83％.
蒋文天; 孙承林; 杨旭; 孙春水; 于杨
A mixture collector with sodium oleate as the main ingredients was prepared,and its flotation performance and mechanism in processing iron ore was studied and compared with commercial collector by use of contact angle and infrared spectra.An open-circuit flotation was made and the results showed that the iron content of concentrate obtained by using the prepared collector(DLC-2) was 58.34%,which was 1.64% more than one obtained by using commercial collector under the similar recovery of iron concentrate.The measuring data of contact angle showed that the contact angle of the silicon dioxide particles which were modified with calcium oxide,amylum and sodium oleate could increase from 65.5° to 74.3°,its hydrophobic property was enhanced,and it was easier to be free from ferric oxide particles.The FTIR results of single mineral showed that flotation reagents are physically absorbed on the surface of ferric oxide,while chemically adsorbed on the surface of silicon oxide.%复配了一种以油酸（钠）为主要成分的混合捕收剂,并从接触角及红外光谱角度对其浮选铁矿石的机理进行了比较研究。开路浮选实验结果表明,与现场药剂相比,在精矿回收率相近的情况下,自配药剂（DLC-2）可获得铁含量为58.34%的精矿,高于现场药剂1.64个百分点。接触角测量结果显示,二氧化硅经氧化钙、淀粉和油酸钠接触改性后,接触角由65.5°增大到74.3°,疏水性能增强,易于与氧化铁分离;单矿物的FTIR测试结果表明,浮选药剂在氧化铁表面以物理吸附为主,在二氧化硅表面发生了化学吸附。
V. V. Ananskikh
Full Text Available Starch is the raw materials for production of crystal food glucose. With at enzyme conversion of the high purity starch, it is possible to receive glucosic syrups of a glucose equivalent (GE 98%, where there is about 95% glucose and maltose and maltotriose – of about 5%. Starch hydrolysis is carried out with a gain of solids. Thus, 100 kg of amylum is possible to give up to 109.81 kg of glucose syrup on dry basis. Taking in account the losses at manufacture steps a yield can decrease to 105.61 kg. The purified glucose syrup is concentrated up to 73–75% of dry matters and goes to a crystallization step. Crystallization of glucose is carried out in a supersaturated solution within 56–70 hours at reduced temperature from 46–48 °C to 24–26 °C, resulting a mixture of glucose crystals and an intercrystal run-off syrup called a massecuite. The crystallization process is stopped when a 50% of crystals content in massecuite is reached. At the same time glucose yield will be 105.61/2 = 52.8%. Crystallization is carried out according to the single-stage scheme, with partial return of the end product – hydrol into the hydrolised syrup. Then the massecuite is sent to a centrifugation step for dividing glucose crystals and a run-off syrup, which is partially returned to the initial syrup to reduce in GE. The second part of the run-off syrup goes to realization. It must be kept in mind: the higher GE of the glucose syrup sent to a crystallization step, the more quantity of a hydrol is possible to be returned to hydrolysed syrup. Therefore, it is in a resulted a higher yield of glucose crystals. On the basis of the carried-out calculations the computer program was made with which it is possible to define a theoretical glucose and a hydrol yield, while changing values of a hydrolysed syrup. The higher GE values of a hydrolysed syrup are the higher yield of crystal glucose and the lower one of hydrol are. So, at 98% GE of a hydrolysed syrup it is
从榆次后沟堡子酒的酒曲中分离纯化酵母菌,得到了2株菌株S1和S2,并采用同化碳源试验、同化氮源试验、硝酸盐利用试验、生成类淀粉试验以及酵母菌的耐酒精性试验对其特性进行探索,结果如下:S1和S2菌株均不能利用甲醇作为碳源,对葡萄糖和蔗糖的利用情况也不同,S1菌株对葡萄糖的利用率最高,蔗糖次之；S2菌株对葡萄糖和蔗糖的利用情况相似；在葡萄糖和蔗糖利用方面,S1菌株较S2菌株同化率高.S1和S2菌株均能在所加氮源周围形成同化圈,表明二者对氮源的利用率很高；在硝酸盐利用试验中,S1和S2菌株所得结果均呈阳性反应,表明二者可以分泌大量胞外酶分解利用细胞外分子中的糖和蛋白质；S1和S2菌株均不能产生类淀粉物质；两株菌对酒精的耐受性也不相同,在同等酒精浓度下,S1菌株较S2菌株长势良好,12％为最适酒精度.%Two yeast strains named SI and S2 were isolated and purified from Hougou Buzi wine of Yu-ci. The tests on carbon assimilation, nitrogen assimilation, nitrate utilization, to generation amylum, and alcohol resistance were conducted to explore its properties. The results were as follows; SI and S2 strains could not use methanol as carbon source. SI strain had the highest use rate of glucose followed by sucrose, similar to S2 strain, but the assimilation rate of SI strain was higher than that of S2 strain in the utilization of glucose and sucrose. SI and S2 strains also had higher nitrogen assimilation rate. The results of SI and S2 strains in the nitrate utilization test were all positive, which indicated that they could secret many extracellular enzymes to utilize the sugar and protein out of cells. Both SI and S2 strains could not produce amyloid substances. The growth of SI strain was better than that of S2 strain under the same alcohol concentration, and 12% was the best alcohol concentration.
clear the Heat and stop diarrhea. These two herbs are capable of promoting Yin, nourishing the Stomach fluid and Spleen Yang-Qi thrives. Then the function of Spleen-Stomach becomes sound, which leads to cease diarrhea and generate the fluid. Besides, Portulaca is rich in potassium salt, combines with glucose and sodium chloride, which makes the electrolyte ingredients of ZXBYM, and basically coincides with that of ORS. Therefore, ZXBYM could either adjust mild or moderate dehydration complicated by infantile diarrhea, or invigorate the Spleen and stop diarrhea. Experimental studies revealed that ZXBYM could obviously inhibit the small intestinal movement in mice, which was confirmed by the charcoal powder advancement test and the defecation study of mice. Also it can promote the absorption of the increasing water content in mice caused by MgSO4 , and recover the loss of body weight induced by diarrhea. In comparison with ORS, the ZXBYM is superior in stopping diarrhea, while in promoting water reabsorption, there is insignificant difference between the two preparations. Moreover, Pueraria and Portulaca contain some amount of amylum, protein, amino acid, vitamin, and such minerals as calcium, phosphorus, etc.,(3,4) so it can compensate for the loss of nutrients to some extent in diarrheal status; its good taste attracts the children to be fond of it. ZXBYM is a new preparation possessing the function of both rehydration and antidiarrhea, so it is better than ORS, and is worthy of development and application.
冯颖辰; 韩如泉; 王纲; 王明然
目的 研究术前含服硝苯地平对吸入七氟醚麻醉中体感诱发电位(SEP)监测的影响.方法 30例ASAⅠ~Ⅱ级Ⅱ期高血压患者,术前SEP检查无异常,随机分为两组,术前1 h A组舌下含服硝苯地平片,B组舌下含服淀粉片.入室后常规快速诱导.维持用药:吸入七氟醚,使吸入浓度分别达到0.5、1.0、1.5 MAC,并维持15 min,观察记录并比较两组患者间血压、心率的变化以及P15、N20、P25波的潜伏期和P15-N20、N20-P25波幅的改变.结果 术前含服硝苯地平组插管期MAP明显低于对照组(P0.05).结论 术前含服硝苯地平对吸入七氟醚麻醉中体感诱发电位监测的影响较小,可以安全地用于需监测体感诱发电位高血压患者术前降压治疗.%Objective To investigate the effects of using nifedipine preoperative during sevoflurane anesthesia on somatosensory evoked potentials ( SEP) in neurosurgical patients. Methods Thirty hypertensive patients with ASA Ⅰ - Ⅱ , and normal SEP undergoing neurosurgery were divided into two groups randomly. Group A was treated nifedipine one hour before operation. Group B was treated a piece of amylum. After tracheal intubation, sevoflurane was inhaled and sevoflurane concentrations of intra-alveoli reached to 0. 5 MAC,1. 0 MAC and 1. 5 MAC in turn. The mean arterial blood pressure, heart rate, and SEP were recorded in both groups. The correlation among them was calculated. Results NIBP and MAP decreased significantly after induction in both groups. With increasing concentrations of sevoflurane, MAP decreased significantly. There was a positive correlation between the latency of LP15,LN20,LP25,P15-N20 wave,N20-P25 wave and concentration of sevoflurane ( P < 0. 05 ). There were no significant differences between the two groups. Conclusions There is no significant effect on SEP with using nifedipine preoperative during sevoflurane anesthesia in neurosurgical patients.
张亚平; 黄嫣红; 林丽卿
目的 建立一种简单的光度比色法,测定饮用水中宽浓度范围碘化物.方法 水中碘化物在碱性条件下经高锰酸钾氧化为碘酸盐,在酸性条件下用亚硝酸钠除去过量氧化剂并以氨基磺酸加尿素除去过量亚硝酸盐后,与碘化钾作用生成I_2并与淀粉显色进行光度比色测定,测定体系中加适量本底微量碘及氯化钠,解决在水样含碘量<100 μg/L时碘-淀粉显色与水碘浓度不成线性比例的显色灵敏度问题.结果 本方法标准曲线线性范围为0～1200 μg/L(r=0.9998);水碘检测限为4μg/L;对含碘量76.6、207.8、560.4μg/L水样各重复测定6次,相对标准偏差(RSD)均<1%;8份不同含碘量水样加标回收率范围为97.0%(485.2/500.0)～102.5%(102.5/100.0);试剂中加亚铁盐消除了水中6价铬(Cr~(6+))的干扰,加溴化钾及亚硝酸钠消除了水中溴酸盐(BrO_3~-)的干扰,水中含0.2 mg/L Cr~(6+)、0.1 mg/L BrO_3~-不干扰测定.结论 本方法操作简单,检测浓度范围宽,具有良好的精密度和准确度,适于应用.%Objective To establish a simple photometric method for the determination of broad concentration range of iodide in drinking water. Methods Iodide in water was oxidized with potassium permanganate in alkaline medium to generate iodate. After excessive oxidant was eliminated with nitrite sodium in acidic medium condition and excessive nitrite was eliminated with a mixture of aminosulfonic acid and urea, iodate was used to react with potassium iodide reagent to form I_2 which further reacted with amylum to form color complex. The absorbance was determined by photometry. In determination reagent system suitable amount of iodide that acted as background and sodium chloride were added to solve the problem of the chromogenic sensitivity, i.e., when iodine concentration was < 100 μg/L in water sample the degree of iodine-starch complex color change could not be in linear proportion to the concentration of iodine in