Responses of Gardenia jasminoides Ellis Leaf Traits and Anatomical Structures to Drought Stress in Purple Soil

[Objectives]This study was conducted to investigate the response of Gardenia to purple soil drought stress,hoping to provide a reference for the selection of plants for vegetation restoration in purple soil regions.[Methods]The pot-weighing water control method was used to apply different degrees of drought stress to Gardenia seedlings in purple soil,and the effects of drought stress on the electrical conductivity,chlorophyll content,leaf morphology and structure of Gardenia leaves were explored.[Results]The leaf electrical conductivity increased with the increase of drought stress intensity,and the leaf electrical conductivity under severe drought stress increased by 59.93%compared with the control;the chlorophyll content of Gardenia showed a single-peak changing trend that increased and then decreased with the development of drought stress,and it was the highest in each stress stage under severe drought stress;the leaf thickness,palisade tissue thickness and sponge tissue thickness of Gardenia were reduced with the stress degree increasing,and showed the largest decreases under severe stress;the stomatal length,stomatal width and stomatal opening of Gardenia gradually decreased with the increase of stress,while the stomatal density gradually increased.[Conclusions]This study provides a technical and resource basis for vegetation restoration in purple soil.

Practical Cultivation Techniques of Gardenia jasminoides Ellis for Flowers-Fruits in Hunan Province

In order to protect and develop the local resources of Gardenia jasminoides Ellis with Hunan characteristics,this paper uses the existing technology,analyzes the existing achievements in the cultivation of G.jasminoides Ellis,investigates and analyzes the actual situation of the seedling base and cooperatives in Hunan,and collects the relevant index data related to the cultivation of G.jasminoides Ellis.This paper summarizes the practical techniques related to land selection,soil preparation,seedling breeding,afforestation technology,tending management,pest control and so on,in order to provide reference basis for planting and cultivateon and industrial development of G.jasminoides Ellis in Hunan.

Technique of Three-dimensional Cuttage of Gardenia jasminoides Ellis

[Objectives]This study was conducted to improve the propagation efficiency of Gardenia jasminoides Ellis and improve the quality of plantlets.[Methods]A G.jasminoides cutting experiment was carried out with three different cuttage modes and two cutting treatment methods,and the rooting time,rooting rate,root amount and plantlet growth were measured and analyzed.[Results]The three-dimensional cutting model of CL1 could not only shorten the nursery cycle and promote root development,but also effectively improve the quality of plantlets and increase the yield of plantlets per unit area.It is an ideal way to improve the quality and efficiency of cutting plantlets.[Conclusions]This study has a positive role in promoting the healthy development of the nursery stock industry.

甲状腺微小乳头状癌合并BRAF^(V600E)基因突变伴侧颈淋巴结转移相关危险因素分析

目的:探讨BRAF^(V600E)基因突变的甲状腺微小乳头状癌侧颈淋巴结转移相关危险因素,对存在基因突变高危因素的微小乳头状癌患者行侧颈淋巴结清扫的适应证进行探索。方法:回顾性分析2018年1月至2019年8月于四川省肿瘤医院80例行甲状腺全切并行侧颈淋巴结清扫的微小乳头状癌患者的临床资料。术后均行石蜡病理切片BRAF^(V600E)基因测序,根据测序结果分为基因突变组(A组)及基因未突变组(B组),术前年龄、性别等进行统计学分析无显著性差异(P>0.05),探究术后侧颈淋巴结转移情况。在BRAF^(V600E)已基因突变患者中,按侧颈淋巴结转移与否分为侧颈淋巴结转移组(C组)和侧颈未转移组(D组),分别进行性别、年龄、肿瘤直径、肿瘤位置、甲状腺功能、甲状腺球蛋白、抗甲状腺球蛋白抗体、肿瘤外侵、肿瘤多灶性、中央区淋巴结转移情况与侧颈淋巴结转移的单因素与多因素分析。结果:80例患者中经BRAF^(V600E)基因测序中50例有突变(A组)以及30例未突变(B组),术前年龄、性别、甲状腺功能、肿瘤位置、多灶性等差异均无统计学意义(P>0.05),术后A组侧颈淋巴结转移(60%)明显高于B组(27%),差异具有统计学意义(P=0.004);BRAF^(V600E)基因突变的50例微小乳头状癌患者中,C组年龄≥55岁的12例(24%)出现侧颈淋巴结转移(P=0.038)、中央区淋巴结转移伴侧颈淋巴结转移存在20例(40%)(P=0.011)、肿瘤位置位于中上份的侧颈淋巴结转移19例(38%)(P=0.049)、肿瘤直径≥7.5 mm出现侧颈转移19例(38%)(P=0.021);而性别、是否存在桥本氏甲状腺炎、甲状腺球蛋白、抗甲状腺球蛋白抗体、肿瘤外侵、多灶性情况同侧颈淋巴结转移差异均无统计学意义(均P>0.05)。结论:BRAF^(V600E)基因突变的甲状腺微小乳头状癌患者更易发生侧颈淋巴结转移,且患者年龄<55岁、肿瘤直径≥7.5 mm、肿瘤位于中上份、中央区淋巴结转移是存在BRAF^(V600E)基因突变的微小乳头状癌侧颈淋巴结转移的危险因素。

功能性TiO_(2)纳米粒子的合成及对聚甲基丙烯酸甲酯物理性能的影响

由水热反应法合成了二氧化钛(TiO_(2))纳米粒子,以“Grafting-onto”的方式对TiO_(2)进行接枝改性,合成了带有聚甲基丙烯酸甲酯(PMMA)长链的TiO_(2)纳米粒子(M-TiO_(2))。红外光谱与热重分析结果表明,TiO_(2)表面成功接枝了PMMA的长侧链,且PMMA接枝密度为0.042 nm^(-2)。随后,将不同表面修饰的纳米粒子与PMMA进行熔融共混,发现相较于纯TiO_(2),改性后的TiO_(2)纳米粒子在PMMA中分散性更好,在扫描电镜与透射电镜中没有观察到明显的团聚现象。通过透光率/雾度测试表征,发现当添加5%未改性TiO_(2)时,复合材料光学性能较差(透光率83.7%,雾度为15.99%);而添加相同量M-TiO_(2),复合材料的透光率和雾度与纯PMMA相近(透光率90.0%,雾度4.96%),折射率可由1.487提升至1.524,且其力学性能和热稳定性也明显改善。这为制备兼具有高机械与折射性能的有机无机杂化纳米复合材料提供了一种新的可靠途径。

Soil Respiration Characteristics and Its Relationship with Environmental Factors of Different Vegetation Types during Growing Season in Dongting Lake

In order to ascertain the soil carbon flux characteristics of poplar plantations and crop communities in the Dongting Lake area during the growing season and their correlation with hydrothermal conditions,soil respiration rate was monitored at fixed sites and time points with an LI-8100 A automated soil flux system.Meanwhile,the surface temperature and soil temperature and humidity were measured. The soil respiration variation in the two different vegetation types and its correlation with environmental factors were analyzed. The results showed that in the growing season,the diurnal variation curves of soil respiration rate in the two different vegetation types showed a single peak variation,but there was certain difference in the appearance time of the peak. The peak of the crop appeared around11: 00 am,while the peak of soil respiration in the poplar appeared around 13: 00. The soil respiration rate of the poplar was also significantly higher than that of the crop,and the average difference of soil respiration rate between the two was 3. 09 and 3. 55 μmol/( m^2·s) in April and August,respectively. Temperature and soil moisture were the main factors affecting soil respiration of the poplar plantation and crop community. Temperature had a greater effect on the soil respiration of the crop community,and soil humidity had a greater impact on soil respiration in the poplar plantation,showing a correlation coefficient reaching 0. 952.

The Oscillatory Motion of Oldroyd-B Fluid by Incorporating Some of the Mechanical Factors

The aim of this paper is to present a numerical study of oscillatory motion of Oldroyd-B fluid in a uniform magnetic field through a small circular pipe. First, we derive the orientation stress tensor by considering the Brownian force. Then, the orientation stress tensor is incorporated by taking Hookean dumbbells on Brownian configuration fields in the Oldroyd-B model. The Oldroyd-B model is then reformulated coupled with the momentum equation and the total stress tensor. Finally, we analyze the orientation stress tensor in the pipe by the numerical simulations of the model and showed that the effect of orientation stress tensor is considerable although the Brownian force is sufficiently small.

Compressive Strength Parallel to Grain Variation of Different Clones of Populus deltoides Marsh.

In order to explore the differences in the compressive strength parallel to grain （CSPG） between different clones and individual woods of Populus deltoides Marsh., the CSPGs of 5 15-year-old P. deltoides clones were determined and analyzed. The results showed that there were significant differences in CSPG of wood between different clones of P. deltoides . The CSPG of the tested clones reached more than 41 MPa, which was higher than the average compressive strength of P. deltoides （32.94 MPa）. Similar to the changes of stem height, the CSPG of the clones gradually increased with the increase of stem height. However, there were significant differences in CSPG of an individual plant at different tree heights. The CSPG of P. deltoides clones was related with their growth traits, but not significantly. Therefore, it is expected to achieve simultaneous and independent improvement on CSPG and the growth of P. deltoides , so as to get excellent individuals with fast growth and high CSPG.

Color tunable and white light emitting via energy transfer in single-phase BiOCl:Er^(3+),Sm^(3+) phosphors for WLEDs

BiOCl crystal shows potential as efficient optical host due to its special layered structure. Here,the luminescence properties of the Er^3＋/Sm^3＋ co-doped BiOCl phosphors as single-phase phosphors were reported. Upon near ultraviolet excitation（NUV, 380 nm corresponding the ^4 I15/2→ ^4 G11/2 transition of Er^3＋ ions）, the phosphors exhibit the efficient characteristic emissions of Er^3＋ and Sm^3＋ ions simultaneously. The energy transfer（ET） from Er^3＋ to Sm^3＋ ions in the layered crystals has been validated by the variation of emission intensities and decay lifetimes respectively, which is ascribed to be a dipoledipole interaction. By virtue of the ET behavior and increasing Sm^3＋ ion concentration, the enhancing emission intensity of Sm^3＋ and the tunability of emission color from yellowish-green（0.318, 0.420） to white（0.343, 0.347） are realized. The results of our work indicate that the Er^3＋/Sm^3＋ co-doped BiOCI phosphor has a promising application serving as single component white emitting phosphors for NUV excited WLEDs.

Effect of poly(4-tert-butylstyrene)block length on the microphase structure of poly(ethylene oxide)-b-poly(4-vinylbenzyl chloride)-b-poly(4-tert-butylstyrene)triblock terpolymers

A series of linear poly(ethylene oxide)-b-poly(4-vinylbenzyl chloride)-b-poly(4-tert-butylstyrene)(PEO_(113)-b-PVBC_(130)-b-Pt BS_(x)or E_(113)V_(130)T_(x))triblock terpolymers with various lengths x(=20,33,66,104,215)of Pt BS block were synthesized via a two-step reversible addition-fragmentation chain transfer(RAFT)polymerization.The E_(113)V_(130)T_(x)triblock terpolymers were non-crystalline because the PVBC and Pt BS blocks strongly hindered the crystallization of PEO block.The effects of Pt BS block length x on the phase structures of E_(113)V_(130)T_(x)triblock terpolymers were investigated by combined techniques of small-angle X-ray scattering(SAXS)and transmission electron microscopy(TEM).It was found that with increasing x from20 to 215,the phase structure of E_(113)V_(130)T_(x)triblock terpolymers became more ordered and changed from disordered structure,hexagonally-packed cylinder(HEX),hexagonally perforated layer(HPL),to lamellar(LAM)phase structures.Temperature-variable SAXS measurements showed that the HEX,HPL and LAM phase structures obtained for E_(113)V_(130)T_(66),E_(113)V_(130)T_(104)and E_(113)V_(130)T_(215)by thermal annealing,respectively,were thermodynamically stable in the temperature range of 30-170℃.

Cohen弱核多线性算子

本文介绍并研究Banach空间上一类新的多线性算子,称为Cohen弱p-核多线性算子.本文为这一类新的多线性算子建立了相应的Pietsch控制定理.作为应用,本文证明了每个Cohen弱p-核多线性算子都是强p-可和的并且也是Cohen强p-可和的.

Enhancement of solar-driven photocatalytic activity of oxygen vacancy-rich Bi/BiOBr/Sr_(2)LaF_(7)∶Yb^(3+),Er^(3+)composites through synergetic strategy of upconversion function and plasmonic effect

For better use of solar energy,the development of efficient broadband photocatalyst has attracted extraordinary attention.In this study,a ternary composite consisting of Sr_(2)LaF_(7)∶Yb^(3+),Er^(3+)upconversion(UC)nanocrystals and Bi nanoparticles loaded BiOBr nanosheets with oxygen vacancies(OVs,SLFBB)was designed and synthesized by multi-step solvent-thermal method.Mechanisms of in-situ formation of Bi nanoparticles and OVs in BiOBr/Sr_(2)LaF_(7)∶Yb^(3+),Er^(3+)composites(SFLB)are clarified.The Bi metal and OVs enhanced the light-harvesting capacity in the region of visible-near-infrared(Vis-NIR),and promoted the separation of electron-hole(e-/h+)pairs.Furthermore,the surface plasmon resonance(SPR)effect of Bi metal can improve the energy transfer from Sr_(2)LaF_(7)∶Yb^(3+),Er^(3+)to BiOBr via nonradiative energy transfer process,resulting in enhancing the light utilization from up-converting NIR into Vis light.Due to the synergistic effects of UC function,SPR and OVs,the SFLBB exhibited obviously enhanced photocatalytic ability for the degradation of BPA with a rate of 8.9×10^(-3) min^(-1),which is about 2.78 times higher than 3.2×10^(-3) min^(-1) of BiOBr(BOB)under UV-Vis-NIR light irradiation.This work provides a novel strategy for the project of high-efficiency Bismuth-based broadband photocatalysts,which is helpful to fur-ther understand the mechanism of enhanced photocatalysis by UC function and plasmonic effect.