高效液相色谱法同时测定氧化型染发产品中33种染发剂

建立了高效液相色谱同时测定氧化型染发产品中33种禁限用染发剂含量的分析方法。采用Waters Atlantis^® T3 MV Kit色谱柱（250 mm×4.6 mm，5 μm），以磷酸盐缓冲液-乙腈为流动相，梯度洗脱，流速为1.0 mL/min，柱温为25℃；采用二极管阵列检测器（DAD），检测波长为235及280 nm，进样量为5 μL。结果表明，各成分在线性范围内线性关系良好，相关系数均高于0.999，各成分精密度实验相对标准偏差（RSDs）均小于2%；四氨基嘧啶硫酸盐和2，4-二氨基苯氧基乙醇盐酸盐在12 h内稳定性实验RSDs小于5%，其余31种成分在24 h内稳定性实验RSDs均小于5%；各成分在3个浓度水平下的加标回收率为77.6%~116.3%。该方法简便、快速、准确，适用于氧化型染发产品中多种染发剂的检测。     

Crystal Structure and Catalytic Properties of Tetrakis（4-hydroxyphenyl）Porphyrinato Manganese （Ⅲ） Chloride （MnTHPPCI）

The crystal structure of meso-tetrakis （4-hydroxyphenyl） porphyrinato manganese chloride （MnTHPPC1） and its supramolecular architecture based on the hydrogen bonds of one counter C1 anion with four hydrogen atoms of four-OH groups from different MnTHPPC1 molecules cooperated by self-assembly of the porphyrin units were first repor-ted. This compound crystallized in the tetragonal space group 14/m with a = 1.39928（7） nm, b = 1.39928（7） nm, c =0.94498（10） nm, V= 1.8503（2） nm^3, and Z =2. As a catalyst, MnTHPPC1 also showed a high catalytic acti-vity in the conversion from 1-naphthylamine （1-NA） to his （4-oxo-benzo-2-cyclohexen-l-yl） amine （BOBCHA） v/a oxidative coupling under mild conditions.     

LIGHT PROMOTION OF SEED GERMINATION IN Datura ferox IS MEDIATED BY A HIGHLY STABLE POOL OF PHYTOCHROME

Abstract— The duration of the far-red light-absorbing form of phytochrome (Pfr) of the photoreceptor pool involved in the control of seed germination was investigated for Datura ferox seeds. These seeds require both Pfr and alternating temperatures (20/30°C) to germinate. After 24 h imbibition (25°C), the seeds received pretreatment-light pulses providing different phytochrome photoequilibria (Pfr/P), followed by a 24 h dark incubation (25°C), and test-light pulses providing different Pfr/P immediately prior to transfer to alternating temperatures. Germination increased with increasing Pfr/P provided by the test-light pulses, but was unaffected by the pretreatment-light pulses. This suggests that phytochrome synthesis, phytochrome degradation and phytochrome-mediated changes in response to phytochrome were negligible. In other experiments, red light-pretreatment pulses were followed by dark incubations (25°C) of different duration before transfer to alternating temperatures. The proportion of Pfr remaining after the 25°C incubation period was estimated by comparing germination rates with those of seeds that received test-light pulses of known calculated Pfr/P immediately prior to the start of the cycles of alternating temperatures. More than 80% of the Pfr established by a Pfr/P= 0.87 light pulse was present and active even after 48 h dark incubation at 25°C. Surprisingly, when a pretreatmentlight pulse providing a Pfr/P= 0.70 was given, the reduction in [Pfr] was significantly faster.
Germination of Datura ferox seeds is under the control of a highly stable (type II like) phytochrome pool. Apparently, this pool follows Pfr dark reversion to the red light-absorbing form, the times to reach half the original Pfr pool being > 96 h or <14 h after light pulses providing Pfr/P= 0.87 or 0.70, respectively.     

可再生能源的开发与利用

为了人类持久的能源供应及日益严重的环境问题，由石化能源逐步过渡到以再生能源为主的时代终将来临。本文简单介绍了新能源在我国发展的优势、条件及目前的发展状况。     

精细化工实验课程教学改革与实践:可陶瓷化阻燃EVA复合材料的制备与性能研究*

结合科研课题及实验教学经验,设计了题为“可陶瓷化阻燃EVA复合材料的制备与性能研究”的精细化工实验课教学项目。该实验以乙烯-醋酸乙烯酯共聚物(EVA)为基材,以叶腊石粉(PL)和磷酸盐玻璃粉(GD)为陶瓷化填料(CF),以有机蒙脱土(OMMT)为抗熔滴剂,以三聚氰胺氰尿酸盐(MCA)为阻燃剂,制备可陶瓷化阻燃EVA复合材料。实验优化了影响阻燃效果、陶瓷强度和复合材料力学性能的因素,确定了合适的配方组成等内容。本精细化工实验课结合了科研内容,能激发学生主动参与实验设计并自主探索科学的兴趣,有利于培养学生的创新能力和解决实际问题的能力。     

Detection and Theoretical Study of Fukui Function of Nitroaromatics by Carbazole-Based Iridium（Ⅲ）Phosphorescent Probe北大核心CSCD

A room temperature phosphorescent Ir（Ⅲ）complex Ir（ppyCz）3 is synthesized by a two-step synthesis method with a carbazole modified organic ligand. The high-efficiency luminescent detection strategy of six familiar nitroaromatics including 1,3-dinitrobenzene,etc. is developed using Ir（ppyCz）3 as the luminescent probe. The highest detection efficiency of 1,3-dinitrobenzene by Ir（ppyCz）3 is demonstrated with the quenching content KSV of（26. 38±1. 05）L/mmol,and minimum detection limit of 2. 50×10−6 mmol/L. Density functional theory calculations and spectral overlap experiments show that the detection mechanism of Ir（ppyCz）3 for the six nitroaromatics is assigned to electron transfer. The sequence of the orbital weighted Fukui function for the six nitroaromatics dovetails with the corresponding detection efficiency sequence of nitroaromatics by Ir（ppyCz）3. © 2022, Science Press (China). All rights reserved.     

超声心动图诊断胎儿先心病及危险因素分析

本研究探讨超声心动图在胎儿先心病诊断中的价值以及影响先心病发病的危险因素。采用回顾性研究方法,选取孕产妇18987例,均进行系统的彩色多普勒超声检查,同时问卷调查胎儿先心病家庭65例(病例组)及130例正常胎儿家庭(对照组)的病史等情况。结果显示,先心病发病率为0.43%,疾病类型中:以单纯性室间隔缺损、心内膜垫缺损和右心室双出口为主;Logistic回归分析结果显示:产妇年龄、孕期有致畸物接触史、产妇糖尿病、产妇结缔病、不良妊娠史、染色体异常、胎儿早期NT值、先心病家族史是先心病发生的影响因素(P<0.05)。从上述结果可知,超声心动图在胎儿先心病诊断中有较好的价值,先心病发病受产妇年龄、致畸物接触史等因素的影响。     

Բ���λ���ƽ�������ά��ʴģ����ʵ���о�

通过使用数值模拟和实验相结合的方法研究圆柱形霍尔等离子体推进器。应用蒙特卡洛方法和Particle In Cell(PIC)方法对放电通道内等离子体碰撞和行为进行模拟。建立圆柱形霍尔推进器的物理和数值模型;通过对放电和加速区等离子体的产生和输运进行模拟,掌握了等离子体放电和加速机理以及内磁极的刻蚀情况。结果表明:随着电压的升高,内磁极刻蚀较为严重;推进器内部离子能量值约为放电电压值的50%左右。同时通过实验方法测定不同放电电压情况下推进器的放电性能。     

NaYF_4∶Yb~(3+),Tm~(3+)/CdSe纳米异质结构的近红外上转换发光性能

采用两步高温热分解法合成了纳米异质结构的Na YF4∶Yb3+,Tm3+/Cd Se。X射线衍射测试结果表明样品由纯六角相的Na YF4(β-Na YF4)和纤锌矿型Cd Se组成。980 nm激发的上转换光谱表明Na YF4∶Yb3+,Tm3+和Cd Se之间存在能量传递,Tm3+将Yb3+传递给它的能量部分地传递给Cd Se,被激发的Cd Se又将能量回传给Tm3+的相应能级,最终使得Na YF4∶Yb3+,Tm3+的紫外和蓝光发射完全消失,而797 nm的近红外发射大幅增强。Na YF4∶Yb3+,Tm3+/Cd Se纳米异质结构的激发光和发射光均处于生物组织的光学透过窗口(700~1 100 nm),对生物组织的光损伤小,在生物医学领域有很大的应用潜力。