基于项目式课程的PEAS教学平台设计与实现

项目式课程改革已成为职业教育三教改革的发展趋势和改革重点,在课程改革实践过程中,教师常常面临教学资源整合困难、项目管理效率低下以及学生成果展示受限等问题。为解决这些问题,设计与实现基于项目式课程的PEAS教学平台,以学生为中心,强调项目经验的积累与共享,并提供综合的项目管理工具与数据分析功能,从而优化项目式课程的教学效果和学习体验,为项目式教学的实施提供有力支持,以期能为高校项目化教学信息平台建设提供经验和借鉴。

Prognostic value of PEA3 subfamily gene expression in cholangiocarcinoma

BACKGROUND Cholangiocarcinoma(CCA)is a lethal malignancy with limited treatment options and poor prognosis.The PEA3 subfamily of E26 transformation specific genes:ETV1,ETV4,and ETV5 are known to play significant roles in various cancers by influencing cell proliferation,invasion,and metastasis.AIM To analyze PEA3 subfamily gene expression levels in CCA and their correlation with clinical parameters to determine their prognostic value for CCA.METHODS The expression levels of PEA3 subfamily genes in pan-cancer and CCA data in the cancer genome atlas and genotype-tissue expression project databases were analyzed with R language software.Survival curve and receiver operating characteristic analyses were performed using the SurvMiner,Survival,and Procr language packages.The gene expression profiling interactive analysis 2.0 database was used to analyze the expression levels of PEA3 subfamily genes in different subtypes and stages of CCA.Web Gestalt was used to perform the gene ontology/Kyoto encyclopedia of genes and genomes(GO/KEGG)analysis,and STRING database analysis was used to determine the genes and proteins related to PEA3 subfamily genes.RESULTS ETV1,ETV4,and ETV5 expression levels were significantly increased in CCA.There were significant differences in ETV1,ETV4,and ETV5 expression levels among the different subtypes of CCA,and predictive analysis revealed that only high ETV1 and ETV4 expression levels were significantly associated with shorter overall survival in patients with CCA.GO/KEGG analysis revealed that PEA3 subfamily genes were closely related to transcriptional misregulation in cancer.In vitro and in vivo experiments revealed that PEA3 silencing inhibited the invasion and metastasis of CCA cells.CONCLUSION The expression level of ETV4 may be a predictive biomarker of survival in patients with CCA.

Genome-Wide Analysis for Yield-Related Agronomic and Biochemical Traits of Chinese and Bangladeshi Grass Pea Genotypes Using SSR Markers

Grass pea(Lathyrus sativus L.)is an imperative food crop cultured in dryland agricultural ecology.It is a vital source of dietary protein to millions of populaces living in low-income countries in South-East Asia and Africa.This study highlights the improvement of genomic properties and their application in marker-trait relationships for 17 yield-related characters in 400 grass pea genotypes from China and Bangladesh.These characters were assessed via 56 polymorphic markers using general linear model(GLM)(P+G+Q)and mixed linear model(MLM)(P+G+Q+K)in the tassel software based on the linkage disequilibrium and population structure analysis.Population structure analysis showed two major groups and one admixed group in the populace.Statistically significant loci pairs of linkage disequilibrium(LD)mean value(D′)was 0.479.A total of 99 and 61 marker-trait associations in GLM and MLM models allied to the 17 traits were accepted at a 5%level of significance.Among these markers,21 markers were associated with more than one trait;12 marker-trait associations passed the Bonferroni correction threshold.Both models found six markers C41936,C39067,C34100,C47146,C47638,and C43047 significantly associated with days to maturity,flower color,plant height,and seed per pod were detected in the Hebei and Liaoyang location(p≤0.01),and the interpretation rate(R^(2)value)11.2%to 43.6%.Conferring to the consequences,the association analysis methodology may operative system for quantitative,qualitative,and biochemical traits related to gene position mapping and support breeders in improving novel approaches for advancing the grass pea quality.

Evaluation of Rhizobium tropici-Derived Extracellular Polymeric Substances on Selected Soil Properties, Seed Germination, and Growth of Black-Eyed Peas (Vigna unguiculata)

Rhizobium tropici-derived extracellular polymeric substances (EPS) have been used in soils to enhance soil structures and mitigate soil erosions. However, information on their use to improve soil health and fertility indicators, and plant growth is limited. In a greenhouse study, we investigated their effects on some soil health, soil fertility indices, and the growth of black-eyed peas (Vigna unguiculate). Results showed that soils incubated with EPS significantly increased basal soil respiration, soil microbial biomass, permanganate oxidizable carbon (POC), and potentially mineralizable nitrogen (PMN). The EPS shifted microbial populations from bacteria to fungi and Gram (−ve) to Gram ( ve) bacteria. However, it had little or no effects on soil pH, soil organic matter (SOM), and cation exchange capacity (CEC). The EPS decreased soil moisture loss, increased soil aggregate stability, but delayed blacked-eyed peas germinations in the soils. At 0.1% (w/w) concentrations in soils, there was increase in plant root nodulations and vegetative growth. This study was carried out within 40 days of incubating soils with EPS or growing the black-eyed peas in a greenhouse study. The plant growth parameters were taken before flowering and fruiting. Further studies of the effects of incubating soils with the extracellular polymeric substances on plant growth. Soil microbial biomass, microbial diversities, and other soil fertility indices are deemed necessary.

Development of an Agrobacterium-mediated CRISPR/Cas9 system in pea(Pisum sativum L.)

Pea(Pisum sativum L.)is an annual cool-season legume crop.Owing to its role in sustainable agriculture as both a rotation and a cash crop,its global market is expanding and increased production is urgently needed.For both technical and regulatory reasons,neither conventional nor transgenic breeding techniques can keep pace with the demand for increased production.In answer to this challenge,CRISPR/Cas9 genome editing technology has been gaining traction in plant biology and crop breeding in recent years.However,there are currently no reports of the successful application of the CRISPR/Cas9 genome editing technology in pea.We developed a transient transformation system of hairy roots,mediated by Agrobacterium rhizogenes strain K599,to validate the efficiency of a CRISPR/Cas9 system.Further optimization resulted in an efficient vector,PsU6.3-tRNA-PsPDS3-en35S-PsCas9.We used this optimized CRISPR/Cas9 system to edit the pea phytoene desaturase(PsPDS)gene,causing albinism,by Agrobacterium-mediated genetic transformation.This is the first report of successful generation of gene-edited pea plants by this route.

Physical and emulsifying properties of pea protein:influence of combined physical modification by flaxseed gum and ultrasonic treatment

This study characterized and compared the physical and emulsifying properties of pea protein(PP)and its modified proteins(ultrasound treated-PP(PPU),flaxseed gum(FG)treated PP(PPFG)and ultrasound treated-PPFG(PPFGU)).The results showed FG triggered the formation of loosely attached complex with PP via physical modification under gentle magnetic stirring at pH 7.0,while ultrasound played an important role in reducing protein size,increasing surface hydrophobicity and molecular fluidity onto oil-water interface.So ultrasound further enhanced the interaction of PP with FG,and produced the PPFGU complex with smaller droplet size,higherζ-potential and lower turbidity.Further,combination of FG and ultrasound improved the physical properties of PP with higher viscosity,stiffer gels(defined as higher elastic modulus),stronger hydrophobic properties,better thermal stability,and fast protein absorption rate.Therefore,the PPFGU coarse emulsion performed highest emulsifying activity index(EAI)and emulsion stability index(ESI)that the stabilized nanoemulsion obtained smallest droplet size,higherζ-potential,and longest storage stability.The combination of FG and ultrasonic treatment will be an effective approach to improving the emulsifying property and thermal stability of PP,which can be considered as a potential plant-based emulsifier applied in the food industry.

基于二维钙钛矿(PEA)_(2)PbI_(4)的光电探测器

二维(2D)钙钛矿以其固有的量子阱结构、较大的激子结合能和良好的稳定性,在光电应用领域中具有广阔的前景。然而,提高二维钙钛矿薄膜质量、降低成本并简化制备工艺仍然面临巨大的挑战。本工作在低退火温度(80℃)且无需其他特殊处理的条件下,采用溶液法制备高质量二维钙钛矿(PEA)_(2)PbI_(4)薄膜,并进一步制备了光电探测器。结果表明,这种光电探测器有较低的暗电流(10^(-11)A),在450 nm光照下具有良好的响应度(107 mA·W^(-1))、较高的探测率(2.05×10^(12)Jones)和快速响应时间(250μs/330μs)。持续控制光照1200 s后,器件可以保持95%的光电流。此外,器件静置30 d后光电流几乎保持不变。本研究为开发稳定和高性能光电器件提供了良好的途径。

PED/PEA-15及其磷酸化状态在卵巢上皮肿瘤中的表达及意义

目的:探讨PED/PEA-15(phosphoprotein enriched in diabetes/phosphoprotein enriched in astrocytes)蛋白及其磷酸化状态在卵巢上皮性肿瘤中的表达及临床意义。方法:免疫组化法检测40例卵巢上皮良性肿瘤(良性组)、40例卵巢交界性肿瘤(交界性组)、50例卵巢上皮癌(恶性组)中PED/PEA-15及其磷酸化状态的阳性表达水平。结果:PEA-15蛋白在良性组中表达高于交界性组及恶性组(P<0.05),且在卵巢癌组中随着卵巢癌恶性程度的增高及临床分期的发展而降低(P<0.05),但与患者年龄无明显相关性(P>0.05)。卵巢癌中PEA-15磷酸化状态p PEA-15-Ser104蛋白表达高于交界性及良性上皮肿瘤(P<0.05)。卵巢癌组织中p PEA-15-Ser104蛋白表达与组织学分级和临床分期有关(P<0.05),但与有无淋巴结转移及年龄无明显相关性(P>0.05);另一位点磷酸化状态p PEA-15-Ser116在不同性质卵巢组织、不同年龄、组织学分级、临床分期、淋巴结转移分组中表达无差异(P>0.05)。结论:PEA-15及其磷酸化状态在卵巢癌的发生发展中发挥重要作用,可否通过调控PED/PEA-15的磷酸化状态从而使之成为卵巢癌治疗的重要靶点仍需进一步研究。

Desiccation Alters the Stability and Distribution of Pea Seed_borne Mosaic Virus in Pea (Pisum sativum) Cotyledon Cells

As a seed transmitted pathogen, pea seed_borne mosaic virus (PSbMV) not only replicates in embryonic cells but can also withstand seed desiccation. To understand the mechanism of PSbMV tolerance to seed desiccation, the authors compared the stability of viral coat protein (CP) and the distribution of viral particles in the cotyledon cells of pea (Pisum sativum L.) embryos collected before and after the dehydration process. Before dehydration, when the embryo was fresh and immature, degradation of CP was observed and a predominantly perinuclear distribution of viral particles in the cotyledon cells was evident. After dehydration, when the embryo was dry and mature, degradation of CP did not occur and the perinuclear viral distribution disappeared. Instead, aggregates containing PSbMV CP were found in the cytoplasm. Electron microscopy showed that these aggregates were composed of PSbMV particles. The formation of PSbMV particle aggregates is apparently triggered by seed dehydration and may be favorable to the virus survival in the desiccated embryonic cells.

Development of a Transient Assay for Investigating the Activation of Pea Hsp70 Gene Promoter by Potyviral Cistrons

建立了一个瞬时表达系统以研究豌豆种传花叶病毒 (PSbMV ,一种马铃薯Y类病毒 )不同基因对豌豆(PisumsativumL .)Hsp70基因启动子激活能力的差异。构建了豌豆Hsp70基因启动子指导下的GUS基因的表达载体 ,同时还制备了 35S启动子指导下的PSbMVP1和P3基因的表达载体。以表达载体DNA包被的金粉做子弹 ,利用基因枪对豌豆离体叶片进行共轰击实验 ,结果表明 ,PSbMVP1和P3基因在激活豌豆Hsp70基因启动子的能力上存在明显差异。

Ca^(2+)和CaM对苹果果实Ca^(2+)-ATPase,SOD和PEA活性的影响

采用4 5Ca2 + 示踪等方法研究苹果果肉质膜微囊Ca2 + ATPase与Ca2 + 运输之间的关系 ,在Ca2 + 和CaM激活剂和抑制剂存在条件下培养果实圆片 ,探索Ca2 + ATPase ,SOD和PEA活性受Ca2 + 和 (或 )CaM调控的可能性。结果表明 ,存在于质膜上的Ca2 + ATPase并受载体A2 3187刺激而活性增加 ,Ca2 + ATPase活性与Ca2 + 运输依抑制剂EB浓度增加而下降 ,二者变化趋势十分一致 ,从而证实了Ca2 + ATPase推动苹果果肉质膜微囊Ca2 + 的主动运输。果肉质膜微囊Ca2 + ATPase同时受到Ca2 + 和CaM调节 ,而SOD和PEA活性仅受Ca2 + 的调节 ,而与CaM无关。

Omi/HtrA2对前列腺癌细胞株PED/PEA-15表达及PC-3细胞凋亡的影响

背景与目的:促、抑凋亡因子间的相互作用与肿瘤的发生、发展密切相关。Omi/HtrA2是新近发现的一种凋亡调节因子,PED/PEA-15是一种广泛表达的抗凋亡蛋白。本研究旨在探讨Omi/HtrA2对PED/PEA-15表达和前列腺癌细胞PC-3凋亡的影响。方法:构建Omi/HtrA2的表达载体和siRNA载体,并用脂质体法分别将两载体转染至PC-3细胞中,Westernblot和ELISA法检测Omi/HtrA2对PED/PEA-15表达和细胞凋亡的影响;Caspase-8检测试剂盒检测PED/PEA-15对Caspase-8活性的影响;Westernblot、RT-PCR法检测Omi/HtrA2特异siRNA序列对其转录、翻译的影响,流式细胞仪检测siRNA导致Omi/HtrA2基因沉默后PC-3细胞凋亡的变化。结果:酶切和DNA测序证实Omi/HtrA2的表达载体和siRNA载体构建成功。通过转染Omi/HtrA2表达载体高表达Omi/HtrA2可抑制PED/PEA-15表达,并增加肿瘤细胞的凋亡率;抑制PED/PEA-15的表达可提高Caspase-8活性。siRNA沉默Omi/HtrA2基因后PC-3细胞对顺铂的敏感性降低。结论:Omi/HtrA2可通过抑制抗凋亡蛋白PED/PEA-15表达而在PC-3细胞凋亡中发挥重要作用。

Transformation of Pea Lectin Gene and Parasponia Haemoglobin Gene into Rice and Their Expressions

Lectin and leghemoglobin in legumes play the important roles, respectively, in recognition of host plants to their rhizobial bacteria, and lowering the oxygen partial pressure around bacteroids and protecting nitrogenase from oxygen in symbiotic nitrogen-fixing nodules. In order to extend the host range of the rhizobial bacteria and to make them fix nitrogen in non-legumes, pea lectin gene (pl) and Parasponia hemoglobin gene ( phl,) have been constructed into a plant expression vector (pCBHUL) and the vector pCBHUL was introduced into rice calli from immature young embryos by particle bombardment. After the calli were regenerated into plantlets on the resistant-selecting media containing hygromycin, they were identified by PCR and Southern blot hybridization. It was indicated that the pi and phb genes were integrated into nucleic genome of the transformed rice plants. GUS activity and the product of the pi gene were determined by GUS staining, Western blot and in situ hybridization at translational level. Eighteen out of 40 plants resistant to hygromycin were positively identified by PCR analysis with the rate of 45%. The pi gene was expressed in 3 out of 18 plants with 17% and 7.5% in 40 plants. The results may provide a clue for exploring whether Rhizobium leguminosarum by. viceae could extend its host range and make the transgenic rice plants have the possibility of being symbiotic, or associative to nitrogen fixation.

Effects of Light and Temperature on the Expression of the Lhcb2 Gene in Pea

An approximately 800 bp cDNA ( Lhcb 2) encoding light_harvesting chlorophyll a/b_binding protein complex (type Ⅱ) was cloned from the seedling of pea ( Pisum sativum L.) with RT_PCR method. Southern blotting using special probe demonstrated that there existed one copy of Lhcb 2 in pea genome. RT_PCR and Northern blotting revealed the expression of Lhcb 2 which was regulated by light in a time_dependent expression manner. The Lhcb 2 gene didn't express untill 2 h after irradiated with white light. Low temperature (4 ℃) also affected the Lhcb 2 gene by decreasing half of its expression under 25 ℃.

PEA3基因在大鼠肾脏组织不同发育时期的表达

目的:探讨PEA3基因在大鼠肾脏组织发育后期不同阶段的表达变化,分析PEA3基因与肾脏发育的关系。方法:获取出生后第1、7、21天和成年大鼠肾脏组织,采用RT-PCR技术检测肾脏组织中PEA3基因mRNA的表达水平。结果:PEA3基因在新生鼠肾脏表达丰富(64.09±10.12)%,出生后7天表达明显减少(22.43±7.97)%,出生后21天(12.79±2.90)%和成年鼠肾(11.17±3.08)%表达微弱,除出生后21天和成年大鼠两组间表达没有统计学差异外,其他各组表达差异均有统计学意义。结论:PEA3基因的表达水平随肾脏发育的成熟而下降,可能与肾脏发生发育有关。

PVF_2/PEA共混体系辐射效应研究

本文通过DSC测定,研究了PVF_2/PEA共混体系的辐射效应,首次发现辐照后共混体系产生熔融峰分裂现象,建立了共混体系的β_b值计算式,并将线性聚合物的溶胶分数与辐照剂量间的关系式(1)推广应用到PVF_2/PEA共混体系。

采用PEA提高灌注桩承载力的原理及工程应用

采用ＰＥＡ提高灌注桩承载力的原理及工程应用游宝坤，方瑞良，王栋民（北京中国建筑材料科学研究院，北京１０００２４）钻孔和沉管灌注桩一般是依靠混凝寸；桩与四周＿上的摩擦力来支撑上部建（构）筑物的、为提高桩的承载能力，工程界主要从桩孔形状、施工工艺等方面进...

Expression and Phylogenetic Analysis of Pea Actin Isoforms

Pea ( Pisum sativum Linn.) actin gene family contains at least three isoforms (PEAcⅠ, PEAcⅡand PEAcⅢ), and the DNA sequence of these isoforms show high similarity in the coding regions and significant divergence in the untranslated regions. RT_PCR and Southern blotting using 3′_untranslated region (3′_UTR) as specific probe revealed that pea isoactin genes were expressed in roots, stems, leaves, tendrils, pollen and juvenile siliques, but displayed different patterns of transcript accumulation. Two_fold serial dilution electrophoresis showed PEAcⅠ mRNA preferentially accumulated in rapidly developing tissues: it peaked in seven days' stem; remained at a rather high level in leaves within a month but decreased significantly later; varied a little in tendrils and reached a median and a very low level respectively in juvenile siliques and in pollen. PEAcⅡ displayed somewhat similar expression pattern to PEAcⅠ. The observed differences in sequences and transcript accumulation patterns suggest that the individual pea actin genes may differ in their transcriptional regulation and cellular function. Phylogenetic tree of actins showed that pea actin isoforms are as diverged from each other as they are from other plant actins, and pea actins might have originated from a common ancestor before the divergence of the dicot and monocot plants.

Effects of Salt Stress on the Activity and the Amount of Tonoplast H^+-ATPase from Pea Roots

To study the function and adaptive mechanism of tonoplast H + ATPase under salt stress, pea ( Pisum sativum L.) seedlings were treated with different concentrations of salt (100-250 mmol/L NaCl) and with 100 mmol/L NaCl for different days (1-3 d). The ATP hydrolytic activity and the proton transport activity and the changes of the amount of tonoplast H + ATPase (subunit A) were measured. ATP hydrolytic activity of H + ATPase prepared from plants treated with 250 mmol/L NaCl was reduced by about 25% compared to that of control plants, but that of stressed plants treated with 100 mmol/L and 200 mmol/L NaCl was unchanged. The activity from plants treated with 100 mmol/L NaCl for up to 3 d was lower than that of control plants by 20%. But the proton transport activity was increased under the same salt stresses as above. These results showed that the changes of the hydrolytic activity and the proton transport activity were not in proportion and salt stress may cause the change of the coupling ratio of H + transport activity to ATP hydrolysis. The protein amount kept unchanged and reduced a little only when pea was treated with 100 mmol/L NaCl for 3 d. These results indicated that salinity stimulated the increase of the pump efficiency of the V_ATPase from pea roots, which was due to the change of the coupling ratio, but not due to the increase of ATP hydrolysis and the amount of V_ATPase.

胃癌组织中磷酸化PEA-15蛋白的表达及临床意义

目的探讨磷酸化PEA-15蛋白在胃癌组织中的表达情况及其临床意义。方法取新鲜胃癌标本50例,并以50例慢性胃炎组织作对照。运用免疫组织化学的方法检测磷酸化PEA-15蛋白的表达,并观察磷酸化PEA-15蛋白的表达与患者性别、年龄、肿瘤分化程度和临床分期的关系。结果胃癌组织中磷酸化PEA-15蛋白阳性表达增高,而慢性胃炎组织标本未测到(P<0.05)。且磷酸化PEA-15蛋白的表达随着胃癌恶性程度增高及临床分期发展而增高(P<0.05),而与发病年龄及性别无关(P>0.05)。结论磷酸化PEA-15蛋白在胃癌的发生及发展过程中发挥重要作用,调控PEA-15磷酸化状态有望成为胃癌分子治疗的重要靶点。