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酵素菌肥的金属元素营养分析 总被引:1,自引:0,他引:1
在磷酸根、硅酸根存在下以2%硝酸镧作机体改进剂,测定了酵素菌肥中多种金属元素的含量,各元素的平均回收率分别为:K98.69%,Ca100.37%,Mg97.81%,Na96.06%,Cu98.26%,Fe96.45%,Zn99.78%,Sr93.54%,Li94.22%。方法简便,快速可靠,肯定 酵素菌肥的金属元素营养价值。 相似文献
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图G的一个L(2.1)-标号是从顶点集V(G)到非负整数的一个函数f,使得若d(u,v)=1时,有|f(u)-f(v)|≥2;若d(u,v)=2时,有|f(u)-f(v)|≥1.图G的L(2.1)-标号数λ(G)是G的所有L(2.1)-标号下的跨度max{f(v):v∈V(G)}的最小数.图Fn+1*为扇图的路上每个顶点增加一个悬挂边得到的图.图Hn为轮图的圈上每个顶点增加一个悬挂边得到的图.本文确定了图Fn+1*与Hn的L(2.1)-标号数. 相似文献
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Molecular fluorescence spectrometry, resonance Rayleigh scattering and gas chromatography-mass spectroscopy(GC-MS) were used to study the effect of pure fish serum albumin(FSA) as the model protein on the extraction of three chlorobenzenes(CBs: 1,3-DCB, 1,2-DCB and 1,2,4-TCB; DCB=dichlorobenzene; TCB=trichlorobenzene) in fish samples. The results show that there was a strong binding effect between CB and FSA. In an aqueous solution of 90%(volume fraction) acetone, a slow but full protein denaturation might take place, which would cause the unfolding of protein and the releasing of CBs. Based on these results, a QuEChERS(quick, easy, cheap, effective, rugged and safe) method was modified by replacing the traditional acetonitrile with acetone aqueous solution in the present work. This modified QuEChERS method was applied in the determination of CBs in fish samples. The spiked recoveries and the limits of detection were 80.4%--118.3% and 2.4--7.3 ng/g, respectively. This paper proposes a new strategy by slowing down the protein denaturation and releasing bound organic compounds to enhance the extraction efficiency of CBs in fish samples. 相似文献
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Gui-zhi Chen 《计算数学(英文版)》2002,(5)
Let A be a real square matrix and VTAV = G be an upper Hessenberg matrix with positive subdiagonal entries, where V is an orthogonal matrix. Then the implicit Q-theorem states that once the first column of V is given then V and G are uniquely determined. In this paper, three results are established. First, it holds a reverse order implicit Q-theorem: once the last column of V is given, then V and G are uniquely determined too. Second, it is proved that for a Krylov subspace two formulations of the Arnoldi process are equivalent and in one to one correspondence. Finally, by the equivalence relation and the reverse order implicit Q-theorem, it is proved that for the Krylov subspace, if the last vector of vector sequence generated by the Arnoldi process is given, then the vector sequence and resulting Hessenberg matrix are uniquely determined. 相似文献
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Blends of PC and PPSQ (A) with high M_w and good ladderlike regularity or PPSQ(B) withlow M_w and more defective Si-atoms in its structure have been prepared by solution casting. Thedispersed spheres (PPSQ(A)-rich) are unevenly dispersed in the continuous PC-rich phase and there isno phase-inversion as PPSQ(A) content increases when the percentage of PPSQ(A) is not more than70%. PPSQ(B)-rich spheres are evenly dispersed in the continuous phase (PC-rich) and phase-inversion occurs when PPSQ(B) percentage is up to 70%. T_g of PPSQ(A)/PC or PPSQ(B)/PC at somecompositions are lower than that of pure PC due to the enlarged free-volume of PC-rich phase becausesome spheres of rigid PPSQ chains are included in the PC-rich phase. PC and PPSQ(A) or PPSQ(B)are partially compatible. The compatibility of PC and PPSQ(B) is better than that of PC and PPSQ(A)with high M_w and good ladderlike regularity. Heat history has some influence on the T_gs andcompatibility of PPSQ(A)/PC and PPSQ(B)/PC blends. 相似文献
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在高温烧结炉中对SrxMg1-xF2(x=0.7,0.9)进行了恒温1000℃-5 h烧结,用X射线测试仪对两种样品进行了衍射实验(XRD).基于Rietveld精修方法的RIETAN-2000程序对所得实验结果进行了晶体结构解析,获得了晶体结构参数和原子热振动各向同性温度因子B.通过Maximum Entropy Method(MEM)解析得到了SrxMg1-xF2(x=0.7,0.9)晶体的等高电子密度分布图谱,实现了等高电子密度分布三维(3D)和二维(2D)的可视化,进一步确定了晶体结构和原子位置. 相似文献