Results: The average of purity of extracted DNA is 1.58,the average of concentration of that is 58.6 ng/μL,and the molecular weight of that is about 23 kb,without RNA.
wood knife threshing(0.8 cm sieve) got the most seed number,937.3 g seeds were extracted from 10 kg materials,showing 8.37% damage,88.33% seed purity and 92.33% germination rate,ranked the second among eight methods.
The weldability, deposited metal's mechanical properties and purity of the new developed shell butt welding SAW material as the same level compared with Kobe Steel US-521HD/PF-500D.
the demonstrative quantity of seeds was 10.3kg/667m2 according to the thousand-seed weight,nursery germinating rate,seed purity and unit yield of seedlings.
In order to improve the purity of Austenitic Stainless Steel lCrl8Ni9Ti used in aviation,smelting process by vacuum induction furnace was studied. The results have shown that through controlling element content to Cr/Ni≤l. 80,7.7≤Ti/C≤15.5,Al<0.10% of lCrl8Ni9Ti smelted by VIF,intergranular corrosion was avoided,crazing of the steel was decreased to enhance the plastic properties as well.
Starting with isovanillin, a two-step sequence involving reductive amination and N-benzylation was performed to provide the compounds in good purity.
After the crude product is recrystallized from tetrahydrofuran (THF), the final product is obtained with purity above 99%.
The polycrystalline materials of SrWO4 were synthesized by means of a solid phase reaction with analytical purity SrCO3 and WO3 at high temperature.
The purity of CPS-0 was determined by HPLC and the structure was elucidated by monosaccharide composition analysis, methylation analysis, GC, GC-MS, NMR spectral (1H-NMR, 13C-NMR, HMQC), UV, IR, and elemental analysis.
After AACH has been calcined at 1200°C for 2 h, the ultrafine α-Al2O3 with uniform particle size, spherical shape, and more than 99.97% purity is obtained and its powder is well dispersed.
An addition product which is very likely a β-sultone was obtained from the spontaneous reaction between chlorotrifluoroethylene and sulfur trioxide as a distillable colorless liquid (Ia+Ib; b. p. 76.0—76.5°, n_D~(20°) 1.3672, d~(21.8°) 1.71). Its structure was elucidated by elementary analysis, determinations of molecular weight and saponification equivalent, and its infrared spectrum. Preliminary studies of its chemical behavior are also here reported.Similarly, from the reaction of sulfur trioxide with 4,...
An addition product which is very likely a β-sultone was obtained from the spontaneous reaction between chlorotrifluoroethylene and sulfur trioxide as a distillable colorless liquid (Ia+Ib; b. p. 76.0—76.5°, n_D~(20°) 1.3672, d~(21.8°) 1.71). Its structure was elucidated by elementary analysis, determinations of molecular weight and saponification equivalent, and its infrared spectrum. Preliminary studies of its chemical behavior are also here reported.Similarly, from the reaction of sulfur trioxide with 4, 5-dichloroperfluoropentene1 (IV), 4, 6, 7-trichloroperfluoroheptene-1 (V)、4, 6, 8, 9-tetrachloroperfluorononene-1 (VI) and 4, 6, 8, 10, 11-pentachloroperfluoroundecene-1(VII) compounds were also obtained namely; (VIII) (b. p. 79.8—80.0°/63.7mm, n_D~(22.2°) 1.3642)、(IX) (b. p. 56°/0.17 mm, n_D~(20.5°) 1.3800)、(X) (b. p. 81—82°/0.08 mm, n_D~(20°) 1.3893)、 and (XI) (b. p. 115—116°/0.40 mm, n_D~(20°) 1.3949). The yields ranged between 70% and 80%.The addition of sulfur trioxide to 4, 4-dichloropernuorobutene-1 and 2,3-dichloroperfiuorobutene-2 yielded products of lesser purity. From the same reactions, the formation of products which possibly were the carbyl sulfates of these two butenes were noted. The products obtained from the reaction of sulfur trioxide with 1, 2-dichloroperfluoroethene and perfluoropropene were mixtures.
In the presesnt paper, two methods for the determination of rare earth impu-rities ia "purified" cerium are described. (1) The sample to be analyzed is converted into chlorides (concentration 10mg CeO_2/ml and acidity 1: 19 HCl). Transfer a drop of the prepared solution tothe flat top of graphite electrode previously treated with liquid paraffin. The elec-trodes are dried on a hot plate and then excited in an A. C. arc (220 V, 5 Amp).Spectrograph, ISP--51 (with UF-85 autocollimating camera tube). Slit, 0.01...
In the presesnt paper, two methods for the determination of rare earth impu-rities ia "purified" cerium are described. (1) The sample to be analyzed is converted into chlorides (concentration 10mg CeO_2/ml and acidity 1: 19 HCl). Transfer a drop of the prepared solution tothe flat top of graphite electrode previously treated with liquid paraffin. The elec-trodes are dried on a hot plate and then excited in an A. C. arc (220 V, 5 Amp).Spectrograph, ISP--51 (with UF-85 autocollimating camera tube). Slit, 0.01 mm.Photographic plate, NIKFI Ⅱ. Using the line pairs (La 4333.74)/(Ce 4330.90'), (Pr 4225.33)/(Ce 4229.63'), (Nd 4061.09)/(Ce 4057.30) and (Y 4374.94)/(Ce 4376.88')La, Pr, Nd & Y can be determined quantitatively in the concentration ranges0.055--0.62%, 0.089--1.29%, 0.052%--0.59% and 0.025--0.40% respectively. Theroot mean square deviations of single determination amount to ±4.7%, ±10.8%,±7.0% and ±7.0% respectively. (2) For cerium samples of high purity, ether extraction is used to removemost of the cerium so that the rare-earth impurities can be concentrated. Becauseof its relatively simple spectrum, the element Y has been used as carrier and in-ternal standard. The concentrate, also in the form of chloride solution (concentration1 mg rare-earth oxides/ml), is excited and photographed by the same method asmentioned in (1) The line pairs used are: (La 4238.38)/(Y 4235.73'), (La 3988.52)/(Y 3951.60'), (Pr 4222.98)/(Y 4235.73) and (Nd 4232.38)/(Y 4235.73')With a sample of 100 mg (1 mg Y_2O_3 added as internal standard), the analyticalsensitivities reach 0.01%, 0.025% and 0.028% for La, Pr and Nd respectively. Theerror of the method amounts to about ±10%.
本工作报告铈中杂质镧、镨,钕及钇的两种光谱测定方法。(1)将试样的氯化物溶液滴于经液体石腊处理过的碳电极上,干燥后以交流电弧激发进行摄谱。采用线对 La 4333.74/Ce 43330.90,Pr 4225.33/Ce4229.63,Nd 4061.09/Ce 4057.30及Y 4374.94/Ce 4376.88时测定灵敏度分别可达0.055％,0.089％,0.052％,0.025％。单次摄谱的均方误差分别为±4.7％,±10.8％,±7.0％及±7.0％。 (2)对于较纯的铈,则采用乙醚萃取先行分离,以浓缩其中所含的杂质,并采用谱线较少的元素钇作内标及载体,以补偿分离过程中损失。浓缩物仍以氯化物溶液状态用上述的激发方法进行摄谱。采用下列线对: La 4238.38/Y 4235.73,La 3988.52/Y 3951.60,Pr 4222.98/Y 4235.73,Nd 4232.38/Y 4235.73取样100毫克时,镧、镨及钕的测定灵敏度分别可达0,01％;0.025％及0.028％。一般误差约在±10％左右。
Design data for high purity toluene recovery from platformate by extractive distillation with phenol, were obtained by a pilot plant study. The extractive distillalations column, 200mm in diameter, possessed 44 bubble cap plates and had a Capacity o?processing 250 kilograms of feed per day. The platformate was first prefractionated to 70-117℃, which contained 0.8% benzene and 48% toluene by weight. The heart cut was then used as the feed for the extractive distillation. The recommended operating conditions...
Design data for high purity toluene recovery from platformate by extractive distillation with phenol, were obtained by a pilot plant study. The extractive distillalations column, 200mm in diameter, possessed 44 bubble cap plates and had a Capacity o?processing 250 kilograms of feed per day. The platformate was first prefractionated to 70-117℃, which contained 0.8% benzene and 48% toluene by weight. The heart cut was then used as the feed for the extractive distillation. The recommended operating conditions were as follows: phenol/feed ratio, 4; reflux ratio, 4-5; feed temperature, 120℃; phenol inlet temperature, 130℃. The actual plates of rectifying, stripping and phenol recovery section were 19, 20 and 5 respectively. The recovery of nitration grade toluene from the feed was 97-98%. When losses in prefractionation, acid washing and redistillation were included, the net recovery of toluene from the platformate was 93%. The result of this study gave the data for designing of full scale production plants.
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