溴酸钾-吖啶红-萘酚体系的光谱研究及其分析应用

基于稀硫酸介质中,萘酚与溴酸钾、吖啶红等发生反应,并形成聚集体,导致体系的共振光散射(RLS)大大增强,从而建立了测定尿中痕量萘酚的RLS新方法.研究了体系的RLS强度的影响因素,优化了反应条件,并对反应机理进行了初步探讨.α-萘酚和β-萘酚最大的RLS峰均位于340 nm;α-萘酚的线性范围为1.85×10-7～2.30×10-5 mol/L,β-萘酚为1.29×10-7～2.40×10-5 mol/L;检出限α-萘酚为5.5×10-8 mol/L,β-萘酚为3.9×10-8 mol/L.该方法已成功用于人尿中痕量萘酚的测定相对标准偏差为4.80 %～6.10 %,平均回收率为98.40 %.与高效液相色谱法比较,结果满意.     

人体血样中肝素钠含量的测定

采用分光光度法,在pH=6.5的Britton(B-R)中,研究了甲基红与肝素钠的相互作用,甲基红在430nm处出现一个特征吸收峰,表明两者能够相互结合形成缔合物,在最佳实验条件下,吸光度值的降低与肝素钠的浓度呈线性关系。线性方程为y=-0.179x+1.333(n=12,r=0.996),测定的线性范围为0.10～12.0 mg.L-1,检测限(3)σ为0.073 mg.L-1。将本法用于人体血样中肝素钠含量的测定,结果令人满意。     

高营养功能性水稻“巨胚红粳1号”选育、营养价值及应用

"巨胚红粳1号"是上海师范大学植物种质资源开发中心育成的一个早熟晚粳功能性水稻品系,主要特点是产量高,胚大(比普通品种增大2~3倍),糙米呈红色,富含花青素.经分析测定,"巨胚红粳1号"稻米的营养价值均明显好于普通种的糙米和精米,尤其γ-氨基丁酸(GABA)和维生素E含量均高于普通种糙米2倍以上,营养极其丰富,具有极大应用价值.     

基质掺杂离子对(Y,Rn)2O2S:Sm3+,Ti4+,Mg2+(Rn=La,Gd,Lu,Ga,Al)红色长余辉材料余辉性能的影响

采用高温固相法制备了基质掺杂的(Y,Rn)2O2S:Sm3 ,Ti4 ,Mg2 (Rn=La,Gd,Lu,Ga,Al)红色长余辉材料,主峰均为4G5/2→6H7/2跃迁的红橙色光发射,不受基质掺杂的影响.余辉性能测试表明掺杂离子半径对余辉性能具有重要的影响:单掺时,与Y3 半径相近并略小时样品的余辉时间有正增长;双离子共掺时均为小半径的掺杂对余辉性能有显著的提高,其中之一半径较大时即具有负效应.并对可能存在的机理进行了初步探讨.     

基质掺杂离子对(Y,Rn)_2O_2S∶Sm~(3 ),Ti~(4 ),Mg~(2 )(Rn=La,Gd,Lu,Ga,Al)红色长余辉材料余辉性能的影响

采用高温固相法制备了基质掺杂的(Y,Rn)_2O_2S∶Sm~(3 ),Ti~(4 ),Mg~(2 )(Rn=La,Gd,Lu,Ga,Al)红色长余辉材料,主峰均为4G5/2→6H7/2跃迁的红橙色光发射,不受基质掺杂的影响.余辉性能测试表明掺杂离子半径对余辉性能具有重要的影响:单掺时,与Y3 半径相近并略小时样品的余辉时间有正增长;双离子共掺时均为小半径的掺杂对余辉性能有显著的提高,其中之一半径较大时即具有负效应.并对可能存在的机理进行了初步探讨.     

Morphological and phylogenetic analysis of a <Emphasis Type="Italic">Gymnodinium</Emphasis>-like species from the Chinese Coast

A Gymnodiniurn-like species was studied with light microscopy （LM） and scanning electron microscopy （SEM）. Also, the internal transcribed spacers （containing 5.8S rDNA） and large ribosomal subunit DNA （D1-D2） sequences were obtained by PCR amplification, and then sequenced to explore the relationships within our isolate, Gymnodinium and other Gymnodiniurn-like species, including Karenia, Gyrodinium, Karlodinium and Symbiodinium. The LM observation showed that the species was characterized by moving in a levorotatory direction, visible hypocone, epicone and transverse groove, all of which are typical for Gymnodinium. In addition, two flagella could be found under SEM. The phylogenetic analysis revealed that the isolate grouped with Symbiodium, rather than other relevant dinoflagellates. All results showed our isolate belongs to Symbiodium. The strain was isolated from a red tide water sample, denoting that Symbiodium may be causative species for algal bloom.     

Red sprites over thunderstorms in the coast of Shandong Province,China

Red sprites, different from lightning flashes occurring in the troposphere, are large and brief dis-charges which appear in the altitude range from about 40 to 90 km above large thunderstorms and are usually caused by cloud-to-ground lightning discharges （CGs）. A total of 17 sprites over two thunder-storms were first observed during the summer of 2007. One of the sprites occurred on July 28 above a thunderstorm in Guan County and the center of the storm was about 272 km from the observation site. The other sprites were recorded at the late night of August I and in the early morning of August 2, and the storm center was about 315 km away. All of the observed sprites occurred in cluster, and their appearances were very different, including ‘columniform sprites＇, ‘columniform sprites＇ with angel-like wings, ‘carrot sprites＇,‘dancing sprites＇, etc. The duration of the sprites varied from a minimum of 40 ms to a maximum of 160 ms with a geometric mean （GM） of 61 ms. The time delay between parental positive cloud-to-ground lightning flashes （＋CGs） and the associated sprites varied from 3.4 to 11.8 ms with a GM of 7.1 ms. The ratio of the number of ＋CGs to the total number of CGs during the time period with sprites was 7 times larger than that when no sprites occurred. Sprites did not appear frequently at the time when the convective activity is strong but when the thunderstorm starts to become weak.     

基于卫星遥感图像的农作物分类算法

为提高遥感图像对农作物的预估精度和农业种植效率, 设计了基于卫星遥感图像的农作物分类算法。 以2018 年 7 月 30 日哨兵二号(Sentinel-2)卫星拍摄的高分辨率哈尔滨市农业示范基地卫星影像为实验数据, 在不同光谱波段内(含红边波段), 通过使用最大似然法、 支持向量机法、 神经网络法分别对影像中水稻、 大豆、玉米、 高粱等农作物特征进行提取、 分类, 获得到农作物分类图;将统计结果与真实的参数进行比较, 分析了相同算法下使用不同数据源, 不同算法使用相同数据源, 这两种情况下的分类精度与可靠性。 实验结果表明,通过神经网络法得到的分类结果精度最高, 可靠性最强, 适合于全国范围内推广。     

近岸海域自动监测网络在广西环境管理服务中的应用

自动监测网络实时在线监测为海洋环境管理提供新的技术方法和基础数据,通过研究和分析近岸海域自动监测网络在水质污染评价和赤潮预警方面的应用,提出构建基于自动监测网络的陆海统筹环境监控预警系统,为广西近岸海域环境管理提供支撑。     

撂荒堆积红壤性土次生演替植物群落结构研究

采用样方法对位于韶关市郊的撂荒堆积红壤性土进行次生演替植物群落结构调查研究．结果表明：撂荒堆积红壤性土经过3年的植被恢复,植物种类组成比较丰富,共有24科48种,植物群落以落叶灌木和多年生草本为优势种群,群落呈现上层灌木下层草本的分层结构,季相明显．从山麓到山顶呈现多年生藤本——多年生草本——落叶灌木的分布特征,说明撂荒堆积红壤性土植被恢复快速,葛藤、鸡矢藤是固定堆积红壤性土的优势藤本植物,丝茅、狗牙根是先锋草本,盐肤木、黄荆树是红壤性土的优势木本植物,也是红壤性土的建群种．此外,被鉴定的48种植物中属于入侵种的有17种,占植物种类的35．42％,说明本地红壤性土植被恢复很容易受外来物种入侵．