乌兰察布胡麻连作田杂草种类及优势种杂草调查

为明确乌兰察布市胡麻连作田杂草种类及优势种杂草,2019—2021年对乌兰察布市农林科学研究所平地泉基地连作13年的胡麻田内的杂草种类和发生危害程度进行调查研究。结果表明,乌兰察布市胡麻连作田杂草有24种,隶属于9科21属,包含杂草种类最多的科是禾本科,有5属5种,占杂草种类总量的20.83%。一年生杂草有16种,占杂草种类总量的66.67%;依据杂草重要值评价,优势种杂草为薄荷、凹头苋、反枝苋、刺儿菜、藜、羊草、稗等7种,其在杂草群落的重要性地位表现为薄荷>凹头苋>反枝苋>刺儿菜>藜>羊草>稗。研究结果可为胡麻田杂草综合防控提供依据。

Crystal Structure,Nano-particle Morphology and Interaction with ATP of [NH_3CH_2CH(NH_2)CH_3]_2 [M(Ⅵ)O_2(OC_6H_4O)_2](M= Mo_(0.6)W_(0.4))and Its Activity to Promote DNA Cleavage

The title complex [ NH3 CH2 CH （ NH2 ） CH3 ]2 [ M （ Ⅵ ） O2 （ OC6 H4 O）2 ] （ M = Mo0. 6 W0.4 ） was synthesized via a simple solution-phase ehemieal route. The determination of single erystal X-ray diffraction revealed that the title eompound is erystallized in a monoelinie system with P2（ 1 ）/n spaee group, a = 1. 0913（10） nm, b = 1. 0442（10） nm, c=1.8842（19） nm, α=90°, β=96.530（17）°, γ=90°, Z=4, and V=2.133（4） nm^3. The mononuelear anionie unit [ M （ Ⅵ ） O2 （ 0C6 H4 O） 2 ] 2 - displays ehiral pseudo-oetahedral [ MO6 ] eoordination geometry and is linked by ehiral eations via hydrogen bond and π…π stacking interaetion. The transmission electron microseopy images show that the title eomplex is eomprised of nano-partieles with diameters ranging from 20 to 50 nm. The NMR study shows the ^1H downfield chemical shifts of [ NH3 CHa Hb CH （ NH2 ） CH3 ]^＋ eations in the title eomplex when it is mixed with adenosine-triphosphate（ ATP）, and the chemical shift difference between Ha and Hb is inereased greatly, and most of the eateeholate ligands dissociate from the eentral metal atoms. The DNA cleavage aetivity experiment reveals that DNA eleavage promoted by the title eomplex is lower than that by Na2 MoO4 whieh possesses antitumor propetty, but higher than that by Na2WO4.

Synthesis of Nonionic Oligomeric Manganese(Ⅱ) Complexes and Investigation of Their Toxicity andΤ_1-Relaxation Enhancement

Six nonionic oligomeric manganese （ Ⅱ ） complexes with oligomeric phosphate-polyglycol-EDTA ester ligands were synthesized and characterized. The longitudinal relaxivities of these complexes were measured. One of these complexes, which showed the highest relaxivity, was chosen to be used in the acute toxicity test and the T1-weighted imaging experiment. It has been found that compared to Gd-DTPA, this nonionic oligomeric Mn（ Ⅱ ） complex exhibits no acute toxicity, generates highly enhanced MRI signals and increases the intention time in the rat liver tissue.

1.5 T下高介电材料几何结构对发射场影响的仿真研究

近年来研究发现,在高场及超高场磁共振成像(MRI)中,高介电材料在提高磁共振射频线圈性能,以及增强图像信噪比方面具有极大的应用潜力.当前高介电材料研究主要集中于其对磁共振图像信噪比的改善,但对于高介电材料几何结构,以及其对发射场分布均匀度影响的研究不多.本研究利用电磁仿真的方法定量分析了1.5 T下,高介电材料几何结构对水模感兴趣区内发射效率均值和发射场B^(+)_(1)均匀度的影响.结果表明,高介电材料的几何结构对B^(+)_(1)均匀度会产生较大影响;比较了不同几何结构的高介电衬垫之后发现,加入四等分圆筒状高介电衬垫后,感兴趣区内发射效率提升最高,同时B^(+)_(1)均匀度也保持良好.该结果对高介电材料应用于MRI具有重要的参考价值.

Implementation of a Quantum Algorithm for Deutsch- Jozsa Problem with Improved Nuclear Magnetic Resonance Sequences

A quantum algorithm for Deutsch-Jozsa problem was implemented by nuclear magnetic resonance of benzene with heteronuclear decoupling during the readout period. It was demonstrated that decoupling can not only remove the undesired long-range couplings but also save the frequency space taken up by nuclear spins, which was expected to be important when scaling to large systems, and also to enhance the signal-to-noise ratio.

Parametrization of Spin Rotation and the Two-Level Problem

The evolution behavior of a spin system subject to a time-varying magnetic field and the relevant two-level problem essentially exhibit like a rotation in a three-dimensional space.It is shown that the parametrization of this rotation is shifted into solving the time-dependent Schrodinger equation of a spin-1/2 system and the rotation parame ters can thus be obtained by a straightforward method.

LC-MS/MS检测早产儿咖啡因血清浓度及其临床应用

目的 建立液相色谱串联质谱法测定早产儿咖啡因血清浓度的方法,并对66例早产儿给药7 d后的咖啡因血清谷浓度进行监测及疗效评估。方法 采用咪达唑仑作为内标,样品经过蛋白沉淀法处理后上样。色谱柱为UPLC BEH C_(18)(2.1 mm×50 mm,1.7μm),柱温设为30℃,流动相由甲醇和0.1%甲酸组成,梯度洗脱,流速为0.4 mL·min^(-1),洗脱时间为4 min,进样量10μL。收集连续使用咖啡因7 d后早产儿血清,进行咖啡因血清谷浓度测定,并观察患儿在用药第8~12天疗效和不良反应发生情况。结果 血清中内源性物质不干扰待测物定量,咖啡因血清浓度在0.5~64μg·mL^(-1)内呈良好的线性关系(R~2为0.999 5)。66例早产儿给药7 d后咖啡因血清浓度为(8.92±6.31)μg·mL^(-1),治疗有效率和不良反应发生率分别为68.18%和10.60%。咖啡因血清浓度水平与治疗有效率和不良反应发生率均有一定的关系,具有统计学意义(P值分别为0.033和0.011)。结论 本方法灵敏度高,重复性好,所需样本量少,能快速准确测定咖啡因血清浓度,为临床安全有效使用咖啡因治疗早产儿呼吸暂停提供保障和依据。