Three-dimensional stress variation characteristics in deep hard rock of CJPL-Ⅱ project based on in-situ monitoring

In deep hard rock excavation, stress plays a pivotal role in inducing stress-controlled failure. While the impact of excavation-induced stress disturbance on rock failure and tunnel stability has undergone comprehensive examination through laboratory tests and numerical simulations, its validation through insitu stress tests remains unexplored. This study analyzes the three-dimensional stress changes in the surrounding rock at various depths, monitored during the excavation of B2 Lab in China Jinping Underground Laboratory Phase Ⅱ(CJPL-Ⅱ). The investigation delves into the three-dimensional stress variation characteristics in deep hard rock, encompassing stress components and principal stress. The results indicate changes in both the magnitude and direction of the principal stress during tunnel excavation. To quantitatively describe the degree of stress disturbance, a series of stress evaluation indexes are established based on the distances between stress tensors, including the stress disturbance index(SDI), the principal stress magnitude disturbance index(SDIm), and the principal stress direction disturbance index(SDId). The SDI indicates the greatest stress disturbance in the surrounding rock is 4.5 m from the tunnel wall in B2 Lab. SDIm shows that the principal stress magnitude disturbance peaks at2.5 m from the tunnel wall. SDId reveals that the largest change in principal stress direction does not necessarily occur near the tunnel wall but at a specific depth from it. The established relationship between SDI and the depth of the excavation damaged zone(EDZ) can serve as a criterion for determining the depth of the EDZ in deep hard rock engineering. Additionally, it provides a reference for future construction and support considerations.

Crop water stress index for off-season greenhouse green peppers in Liaoning, China

The crop water stress index(CWSI)is a complex instrument to effectively monitor the degree of water stress of crops and provides guidance for timely irrigation.In an experiment utilizing the CWSI with off-season green peppers planted in barrels in a greenhouse in Liaoning Province,Northeast China,this study monitors the sub-indexes--such as canopy temperature,environmental factors and yield--determines the changing law of each constituent,achieves an empirical model as well as a baseline formula for the canopy temperature of the peppers with a sufficient water supply,and verifies the rationality of the formula with corresponding experimental data.The results obtained by using the CWSI show that the optimal time to determine the water deficit for off-season green peppers is at noon,by measuring the diurnal variation in the peppers with different water supplies.There is a nonlinear relationship between the yield and the average CWSI at the prime fruit-bearing period;moreover,the optimal time to supply water for off-season green peppers comes when the average water stress index ranges between 0.2 and 0.4 during the prime fruiting stage,thereby ensuring a high yield.

A method for canopy water content estimation for highly vegetated surfaces-shortwave infrared perpendicular water stress index

In this paper, a new method for canopy water content (FMC) estimation for highly vegetated surfaces- shortwave infrared perpendicular water stress index (SPSI) is developed using NIR, SWIR wavelengths of Enhanced Thematic Mapper Plus (ETM+) on the basis of spectral features and distribution of surface targets with different water conditions in NIR-SWIR spectral space. The developed method is further explored with radiative transfer simulations using PROSPECT, Lillesaeter, SailH and 6S. It is evident from the results of validation derived from satellite synchronous field measurements that SPSI is highly correlated with FMC, coefficient of determination (R squared) and root mean square error are 0.79 and 26.41%. The paper concludes that SPSI has a potential in vegetation water content estimation in terms of FMC.

Novel association between sperm deformity index and oxidative stress-induced DNA damage in infertile male patients

Aim:To investigate the impact of abnormal sperm morphology using the sperm deformity index (SDI) on reactive oxygen species (ROS) production and its correlation with sperm DNA damage.Methods:Semen samples were collected from men undergoing infertility screening (n=7) and healthy donors (n=6).Mature spermatozoa were isolated and incubated with 5 mmol/L β-nicotinamide adenine dinucleotide phosphate (NADPH) for up to 24 h to induce ROS.Sperm morphology was evaluated using strict Tygerberg's criteria and the SDI.ROS levels and DNA damage were assessed using chemiluminescence and terminal deoxynucleotidyl transferase-mediated fluorescein- dUTP nick end labeling (TUNEL) assays,respectively.Results:SDI values (median [interquartiles]) were higher in patients than donors (2 [1.8,2.1] vs.1.53 [1.52,1.58],P=0.008).Aliquots treated with NADPH showed higher ROS levels (1.22 [0.30,1.87] vs.0.39 [0.10,0.57],P=0.03) and higher incidence of DNA damage than those not treated (10 [4.69,24.85] vs.3.85 [2.58,5.10],P=0.008).Higher DNA damage was also seen following 24 h of incubation in patients compared to donors.SDI correlated with the percentage increase in sperm DNA damage following incubation for 24 h in samples treated with NADPH (r=0.7,P=0.008) and controls (r=0.58,P=0.04). Conclusion:SDI may be a useful tool in identifying potential infertile males with abnormal prevalence of oxidative stress (OS)-induced DNA damage.NADPH plays a role in ROS-mediated sperm DNA damage,which appears to be more evident in infertile patients with semen samples containing a high incidence of morphologically abnormal spermatozoa.

Assessment of Photochemical Reflectance Index as a Tool for Evaluation of Chlorophyll Fluorescence Parameters in Cotton and Peanut Cultivars Under Water Stress Condition

The relationships between photochemical reflectance index （PRI） and the chlorophyll fluorescence parameters were examined to assess suitability of PRI as a remote-sensing tool for the chlorophyll fluorescence parameters. A greenhouse experiment was conducted using cotton and peanut crops under water stress condition. Five cotton and six peanut cultivars were grown using Andosole soil in pots maintained at two water levels; the control and water stress treatment （WS） of 100 and 50% of the daily transpiration, respectively. Higher non-photochemical quenching （NPQ） was exhibited by peanut than that of cotton by the water stress. On the other hand, the decreases of the actual quantum yield of photosystem II （△F/F＇m） and PRI by the water stress in cotton were larger than those in peanut. There were positively significant correlation coefficients between PRI and △F/F＇m in cotton at noon and in the afternoon including the control and WS. The correlations of PRI with NPQ were negatively significant at noon and in the afternoon for cotton, and in the afternoon for peanut. No clear relationship was found among these parameters in the morning probably due to the diurnal increase in global solar radiation. It was concluded that there would be a possibility to detect the effects of water stress on △F/F＇m and NPQ by PRI with some exceptions, although PRI could not note varietals differences in △F/F＇m and NPQ for each treatment.

红景天注射液对帕金森病患者治疗效果及血清DJ-1/Nrf2通路相关氧化应激指标的影响

目的 探究红景天注射液对帕金森病患者治疗效果及血清DJ-1/核因子相关因子2(Nrf2)通路相关氧化应激指标的影响。方法 前瞻性选取2021年6月至2022年6月来河北北方学院附属第一医院治疗的120例帕金森病患者作为研究对象,按照随机数字表法将患者分为研究组与对照组,每组各60例。对照组患者接受常规抗帕金森病治疗,研究组患者在此基础上联用红景天注射液治疗,连续治疗4周。比较两组患者的临床疗效,治疗前、治疗后4周的氧化应激指标[超氧化物歧化酶(SOD)、丙二醛、谷胱苷肽过氧化物酶(GSH-Px)、DJ-1蛋白、Nrf2],治疗前、治疗后4个月的帕金森病综合症状、生活质量情况,并观察两组患者不良反应发生情况。结果 治疗后,观察组患者的治疗有效率为96.61%,明显高于对照组(83.05%),差异有统计学意义(P<0.05)。治疗后4周,观察组患者血清SOD、GSH-Px、Nrf2水平分别为(44.27±2.19) U/mL、(44.12±6.72) U/L、(669.68±87.23) U/L,均明显高于对照组[(31.29±2.97) U/mL、(40.82±4.12) U/L、(602.09±52.31) U/L],而血清丙二醛、DJ-1蛋白水平分别为(2.27±0.86) nmol/mL、(7.08±2.19)μg/L,均明显低于对照组(3.69±1.15) nmol/mL、(10.92±1.29)μg/L,差异均有统计学意义(P<0.05)。治疗后4个月,观察组患者的UPDRS评分为(46.23±2.34)分,明显低于对照组[(63.28±1.93)分],差异有统计学意义(P<0.05)。治疗后4个月,观察组患者的生理功能、躯体功能、社会功能、心理状态、情感功能5个方面的评分分别为(73.12±5.22)、(78.23±2.34)、(81.23±2.13)、(88.29±3.91)、(86.39±3.23)分,均明显高于对照组[(53.13±6.48)、(59.28±4.92)、(69.24±5.91)、(71.23±2.03)、(71.13±3.25)分],差异均有统计学意义(P<0.05)。治疗后,观察组患者不良反应发生率为8.47%,明显低于对照组(23.73%),差异有统计学意义(P<0.05)。结论 在常规抗帕金森病治疗基础上,采用红景天注射液治疗帕金森病可明显提高患者的临床疗效,抑制DJ-1/Nrf2通路相关氧化应激反应,改善帕金森病症状,提高患者生活质量,降低不良反应发生率。

Clinical effect of acupuncture at ghost points combined with fluoxetine hydrochloride on mild-to-moderate depression

BACKGROUND Depression is a common,chronic,and recurrent mood disorder that has become a worldwide health hazard.Fluoxetine hydrochloride,a common treatment method,can inhibit 5-hydroxytryptamine(5-HT)recycling in the presynaptic membrane;however,the efficacy of a single drug is inadequate.At present,mildto-moderate depression can be treated with acupuncture of ghost caves,but the clinical curative effect of combined therapy with fluoxetine hydrochloride has not been sufficiently reported.AIM To evaluate the clinical effect of acupuncture at ghost points combined with fluoxetine hydrochloride in the treatment of mild-to-moderate depression.METHODS This retrospective study included 160 patients with mild-to-moderate depression who were admitted to Shanghai Hospital of Integrated Traditional Chinese and Western Medicine,Affiliated to Shanghai University of Traditional Chinese Medicine,between January 2022 and June 2023.Patients were separated into a single-agent group(fluoxetine hydrochloride treatment,n=80)and a coalition group(fluoxetine hydrochloride treatment combined with acupuncture at ghost points,n=80).Pre-treatment symptoms were recorded,and the clinical curative effect and adverse reactions[Asberg Antidepressant Side Effects Scale(SERS)]were assessed.Depression before and after treatment[Hamilton Depression Scale(HAMD)-24],neurotransmitter levels[5-HT,norepinephrine(NE),dopamine(DA)],oxidative stress indicators[superoxide dismutase(SOD),malondialdehyde(MDA)],and sleep quality[Pittsburgh Sleep Quality Index(PSQI)]were compared.RESULTS The total efficacy rate was 97.50%in the coalition group and 86.25%in the single-agent group(P<0.05).After 2,4,6,and 8 wk of treatment,the HAMD,self-rating depression scale,and SERS scores of the coalition and single-agent groups decreased compared with pre-treatment,and the decrease was more significant in the coalition group(P<0.05).After 8 wk of treatment,the levels of NE,DA,5-HT,and SOD in the coalition and single-agent groups increased,while the levels of MDA decreased;the increases and decrease in the coalition group were more significant(P<0.05).The PSQI scores of the coalition and single-agent groups decreased,and the decrease was more significant in the coalition group(P<0.05).CONCLUSION Acupuncture at ghost points combined with paroxetine tablets can safely improve depressive symptoms and sleep disorders,regulate neurotransmitter levels,and reduce stress responses in patients with mild-to-moderate depression.

丁二磺酸腺苷蛋氨酸联合熊去氧胆酸治疗原发性胆汁性胆管炎的效果及对氧化应激指标的影响

目的研究丁二磺酸腺苷蛋氨酸联合熊去氧胆酸治疗原发性胆汁性胆管炎(PBC)的效果及对氧化应激指标的影响。方法选取2017年5月至2022年5月在我院接受治疗的100例PBC患者为研究对象,根据随机数字表法将其分为对照组和观察组,每组50例。对照组采用熊去氧胆酸治疗,观察组采用丁二磺酸腺苷蛋氨酸联合熊去氧胆酸治疗。比较两组的肝功能指标、炎症和氧化应激指标、临床疗效及不良反应发生情况。结果治疗后,观察组的总胆红素(TBiL)、总胆汁酸(TBA)、丙氨酸氨基转移酶(ALT)、碱性磷酸酶(ALP)以及天冬氨酸氨基转移酶(AST)水平明显低于对照组,差异具有统计学意义(P<0.05)。治疗后,观察组的白细胞介素-12(IL-12)、磷脂转运蛋白(PLTP)、丙二醛(MDA)水平低于对照组,差异具有统计学意义(P<0.05)。观察组的治疗总有效率高于对照组,差异具有统计学意义(P<0.05)。两组的不良反应总发生率比较,差异无统计学意义(P>0.05)。结论丁二磺酸腺苷蛋氨酸联合熊去氧胆酸治疗PBC的效果理想,可明显改善肝功能,抑制机体氧化应激反应。

迷你临床演练评估(Mini-CEX)在中医儿科临床带教中的应用效果

目的 分析迷你临床演练评估(Mini-CEX)在中医儿科临床带教中的应用效果。方法 选取2019年5月—2020年5月医院中医儿科实习医学生30例,按随机数字表法分为研究组15例和对照组15例,对照组采用传统教学方法,研究组采用Mini-CEX教学方法。对比两组中医临床综合能力、临床教学认可情况、压力指数和职场正念评分以及职业满意度评分变化。结果 干预后,研究组临床判断、沟通技巧评分较对照组高(P<0.05);研究组提高学习积极性,提高学习效率,提高自主学习能力、提高发现问题能力、提高解决问题能力与对照组对比无显著差异(P>0.05);干预后,研究组压力指数较对照组低、职场正念评分较对照组高(P<0.05);干预后,研究组职业满意度评分较对照组高(P<0.05)。结论 Mini-CEX教学方法可以提高实习医学生的中医临床综合能力,减轻实习医学生对临床工作的压力,提高其职场正念和职业满意度。

干旱胁迫下丛生福禄考的生理响应

以丛生福禄考(Phlox subulata)为材料,采用干旱胁迫的方法,研究不同干旱处理时间对丛生福禄考生理指标的影响,以期为研究丛生福禄考响应干旱胁迫的分子机制提供理论依据,为福禄考属植物园林应用及种质资源创新提供参考依据。结果表明,随着干旱时间的延长,丛生福禄考根系MDA含量在干旱4天时含量较高,之后呈下降趋势。总糖含量在干旱8天时达到最低值,之后缓慢增加。Pro含量呈现升-降-升-降变化,SOD活性先下降然后上升,POD活性呈现先下降后上升再下降的趋势。综上所述,丛生福禄考在遭受到干旱胁迫损伤后,积累了一定的活性氧,进而激发了氧化过程,复水后恢复。可见,丛生福禄考具有较强的耐旱能力。

‘娇红1号’红花玉兰对水分胁迫的生理响应

以‘娇红1号’1年生嫁接苗为试材,设置盆栽土壤含水量为田间最大持水量(FWC)的20%(HD)、40%(LD)、60%(CK)、80%(LF)、100%(HF)5个处理,测定不同处理条件下‘娇红1号’叶片的光合特性和生理指标分析‘娇红1号’红花玉兰对水分胁迫的生理响应,探究‘娇红1号’红花玉兰在江西等江南丘陵区的引种效应。结果表明:在水分胁迫下,HD处理下的‘娇红1号’苗木在胁迫第10天全部死亡(其余的存活率为100%),CK下‘娇红1号’叶片的叶绿素含量先降后升,其余处理都随着胁迫时间的加长而降低。P_(n)和G_(s)的日变化出现双峰现象,T_(r)日变化呈现先升后降趋势,C_(i)日变化呈现上升趋势,WUE和L_(s)的日变化呈现下降趋势。CK处理的P_(n)、G_(s)、C_(i)和T_(r)日均值最大,HF处理下WUE和L_(s)最大。随着胁迫时间的延长,‘娇红1号’苗木叶片可溶性糖、可溶性蛋白和MDA含量呈现先升后降的变化趋势。Pro含量和SOD活性呈现上升趋势。APX活性呈现先降后升再降的变化趋势,且在胁迫维持到第40天时CK处理下最低。可见,60%~80%FWC的条件下最利于‘娇红1号’红花玉兰的生长。

基于内聚力模型的再生沥青混合料低温断裂性能研究

内聚力模型(CZM)在沥青混凝土开裂研究中得到了广泛应用,但采用内聚力模型对再生沥青混凝土断裂的研究还很少。本文采用随机算法和坐标控制法建立包含旧集料和新集料的再生沥青混合料半圆弯拉模型,将模型分为集料同分布模型和集料随机分布模型两类。研究-10℃时不同RAP掺量(0、25%、50%、75%、100%,质量分数)对再生沥青混合料SCB试件应力强度因子K_(IC)、断裂能G_(F)和抗裂指数I_(CR)的影响。研究结果表明:无RAP掺入的SCB试件具有较好的断裂性能;随着RAP掺量增大,应力强度因子K_(IC)、断裂能G_(F)和抗裂指数I_(CR)均减小,表明RAP的掺入会削弱沥青混合料的低温断裂性能;采用有限元模型得到的断裂参数与室内试验结果一致;相比于集料同分布模型,集料随机分布模型各评价指标的变异性系数整体更大,表明集料分布状态对开裂结果有一定影响;当计算样本足够多时,这两类模型获得的抗裂参数变化规律一致,可有效评价再生沥青混合料断裂性能。

基于SWAT的沁河流域水压力指数计算及生态脆弱性分析

生态脆弱性是综合反映流域生态系统健康水平的重要属性,而水资源是维持流域生态系统健康和可持续发展的关键因素。因此,从水资源领域评估流域生态脆弱性并分析其时空变化特征对于应对流域水资源短缺压力和改善流域生态系统健康水平具有重要的研究价值。以沁河流域为研究对象,构建流域SWAT模型,引入水压力计算公式,从蒸散发量的角度,量化分析沁河流域2010-2016年生态脆弱性的时间变化和空间分布特征。结果表明:①SWAT模型经过率定与验证后,纳什系数E NS和相关系数R 2均符合模型精度标准,表明该模型在沁河流域具有良好的适用性。②流域年际水压力指数值随时间递减,表明沁河流域生态脆弱性及生态系统状态逐年好转,蒸散发量是主要影响因素。③流域水压力指数年内变化大,本年度12月到次年度2月的生态脆弱性较强;结合相关研究结果,认为降水和冰雪天气是主要影响因素。④流域整体生态脆弱性状况逐年改善,但流域内部生态脆弱性空间差异化呈现扩大趋势。

盐胁迫下不同抗性小麦幼苗生理生化特性及转录组分析

为探究不同抗盐性小麦对盐胁迫的响应差异,选用‘百农889’和‘中国春’小麦品种,利用200 mmol·L^(-1)NaCl溶液处理离体叶片和小麦幼苗,对盐胁迫后小麦幼苗叶片的生理、生化特征进行分析,并基于转录组数据分析差异基因表达及可变剪切事件。结果表明,盐胁迫下,‘百农889’离体叶片的失绿程度较‘中国春’轻微;伊文思蓝染色后,‘中国春’离体叶片的蓝色着色范围更大,且细胞相对活性显著降低;‘中国春’幼苗表现出明显的萎蔫、倒伏,‘百农889’幼苗的形态与对照组无明显差异;2个品种的相对电解质渗漏率都有所增加,但‘中国春’幼苗的相对电解质渗漏率增幅更大;‘中国春’的净光合速率(net photosynthetic rate,Pn)和气孔导度(stomatal conductance,Gs)受到显著抑制,‘百农889’的净光合速率和气孔导度与对照比无明显变化。转录组测序结果分析表明,与‘中国春’相比‘,百农889’中上调差异表达基因2299个,下调差异表达基因2527个;对差异表达基因的GO(gene ontology)富集分析发现,与叶绿体、光合作用和质膜相关的功能基因被显著富集;KEGG(Kyoto encyclopedia of genes and genomes)富集分析发现,与植物激素信号转导和植物次生代谢物相关的通路被显著富集。盐胁迫下,‘中国春’表现出更多的可变剪切事件,且主要富集在RNA转运和内质网蛋白加工等通路中。因此,小麦可以通过调控与叶绿素、质膜、次生代谢物以及光合作用相关基因的表达来抵抗盐胁迫,可变剪切事件的发生也说明小麦可以通过调控基因互作网络来应对盐胁迫。

口服麻杏石甘散对BRD犊牦牛血清指标的影响

研究探讨了麻杏石甘散灌服对犊牦牛呼吸道疾病(bovine respiratory disease,BRD)的治疗效果及血清中氧化应激指标和炎性指标的影响,为其在临床应用提供理论依据。选择12头表现BRD症状的犊牦牛,以0.75 g/kg剂量温热水冲调灌服麻杏石甘散,每天1次,连用6 d,以5头健康犊牛正常饲喂作为空白对照,用药前(第0天),药后第3、6天记录犊牦牛临床症状并根据WI评分表进行打分评价,颈静脉采血测定血清中肿瘤坏死因子-α(TNF-α)、溶菌酶(LYZ)、白细胞介素-6(IL-6)、乳铁蛋白(LTF)、血清淀粉样蛋白A(SAA)等5种抗炎及抗氧化应激指标水平。结果表明,用药后第6天,WI评分较第3天显著性降低(P<0.05),治愈率为83.3%。通过6 d治疗,患病组犊牛血清中TNF-α、LZM、IL-6、LTF、SAA等抗炎及抗氧化指标浓度与健康组差异不显著(P>0.05)。可见,在本试验条件下,麻杏石甘散能有效改善犊牦牛BRD症状,缓解炎性反应及氧化应激症状,对治疗牦牛BRD具有一定的价值,可用于高寒地区牦牛及相关草食动物呼吸道疾病治疗。

盐胁迫下不同基因型核桃实生幼苗生长及生理响应

【目的】研究不同基因型核桃实生幼苗对盐胁迫的生长及生理响应状况,综合评价其耐盐能力,为盐碱地区耐盐品种的筛选提供参考。【方法】以新新2号(JX2)、温185(JW185)、扎343(JZ343)和辽宁1号(JL1)共4种基因型种子的当年生实生苗为材料,以不同浓度NaCl溶液(0、50、100、200和300 mmol·L^(-1))进行胁迫处理,观测幼苗生长状况,测定处理不同天数(6、12、18和24天)的光合参数、膜透性、渗透调节物质、酶活性和内源激素含量等相关生理指标,对4种基因型的耐盐能力进行综合评价。【结果】1)盐胁迫条件下,4种基因型幼苗的生长受到不同程度的影响,各基因型的叶片均表现出了不同程度的枯黄、卷曲和脱落等盐害症状,苗高增量、地径增量及植株干质量等生长指标随NaCl浓度的增加呈下降趋势,其中,JX2生长状况相对较好,受抑制程度较轻。2)随盐浓度的增加和胁迫时间的延长,各基因型的叶绿素含量和光合参数总体呈下降趋势,JX2较对照的降幅较小,表现较好。3)随盐浓度的增加和胁迫时间的延长,相对电导率(REC)和丙二醛(MDA)含量总体呈上升趋势,其中,JX2的REC值和MDA含量较低,较对照增幅较小,JZ343则相反。4)随盐浓度的增加和胁迫时间的延长,脯氨酸(Pro)含量总体呈上升趋势,可溶性糖(SS)和酶活性总体表现为先增加后减少,其中,JX2积累的Pro和SS较多,并且JX2的酶活性较高。5)在内源激素方面,促进脱落酸(ABA)生成的同时抑制了生长素(IAA)等的合成。【结论】盐胁迫显著影响各基因型幼苗的生长和光合作用,使其叶片细胞光合活性降低,植株生长减缓,幼苗能够通过增加渗透调节物质含量、提高酶活性、调节自身激素平衡等机制来应对盐胁迫。通过综合评价可知,4种基因型耐盐能力的大小顺序为:JX2>JW185>JL1>JZ343。

医护一体化工作模式对回肠造口患者应激指标及肠功能恢复的影响

目的探讨医护一体化工作模式对回肠造口患者应激指标及肠功能恢复的影响。方法将2022年2月至2023年1月在我院接受回肠造口术的82例患者以随机数字表法分为对照组(40例)与观察组(42例)。对照组给予常规护理,观察组给予医护一体化工作模式。比较两组的护理效果。结果术前,两组的空腹血糖(FBG)、C反应蛋白(CRP)、白细胞介素-6(IL-6)及皮质醇(Cor)水平比较,差异无统计学意义(P>0.05);术后第5天,观察组的FBG、CRP、IL-6及Cor水平低于对照组(P<0.05)。观察组的肠鸣音恢复时间、首次排气时间短于对照组,差异具有统计学意义(P<0.05)。观察组的护理满意度高于对照组(P<0.05)。结论医护一体化工作模式可以减轻回肠造口患者的应激反应,促进肠功能恢复,帮助患者早日回归社会。

腹腔镜子宫切除手术瑞芬太尼联合丙泊酚镇痛效果及对患者血流动力学、应激指标影响

目的:探究腹腔镜子宫切除术应用瑞芬太尼联合丙泊酚麻醉镇痛效果及对患者血流动力学、应激指标和不良反应影响。方法:选取本院2021年1月-2023年12月接诊的拟行腹腔镜子宫切除术患者128例,随机分为观察组和对照组(均n=64),均行腹腔镜子宫切除术,术中对照组予以舒芬太尼联合丙泊酚麻醉诱导,随后持续泵入维持;观察组予以瑞芬太尼联合丙泊酚麻醉诱导,随后持续泵入维持。对比两组血流动力学指标、应激指标、疼痛指标、疼痛视觉模拟评分(VAS)及不良反应。结果:麻醉诱导后、气管插管时、手术开始时及手术结束即刻心率和平均动脉压水平观察组均低于对照组,术后即刻两组肾上腺素、皮质醇、5-羟色胺和脑内神经肽水平均低于术前且观察组(60.26±5.41 pg/ml、84.22±5.03ng/ml、90.24±9.31ng/L、121.69±13.47μg/L)低于对照组(69.96±5.15pg/ml、92.15±6.39ng/ml、139.64±12.13ng/L、160.55±16.36μg/L),两组术后即刻疼痛评分均低于术前,且观察组(2.95±0.21分)低于对照组(3.37±0.32分)(均P<0.05);不良反应发生率观察组(9.4%)与对照组(3.1%)无差异(P>0.05)。结论:腹腔镜子宫切除术应用瑞芬太尼联合丙泊酚麻醉,可显著改善患者血流动力学指标、应激水平,降低患者疼痛介质水平和VAS评分,且不增加不良反应。

2,4-表油菜素内酯对干旱胁迫下西瓜幼苗生长及相关基因表达的影响

【目的】研究外源2,4-表油菜素内酯(2,4-epibrassinolide,EBR)对干旱胁迫条件下西瓜幼苗生长以及相关基因表达的影响,为西瓜抗旱研究提供理论基础。【方法】以西瓜品种齐红1号为材料,利用15%聚乙二醇(PEG6000)模拟干旱胁迫,设置3个处理CK(清水)、PEG和PEG+EBR,其中EBR的浓度为0.01 mg/L。检测不同处理后西瓜幼苗的生物量、光合作用指标、叶绿素含量、抗氧化酶活性以及相关基因的表达量。【结果】喷施外源EBR可以缓解干旱胁迫对西瓜幼苗生长发育的抑制和损害程度,还可以通过增加应答基因的表达量,激活EBR信号转导途径,提高西瓜幼苗的耐旱性。喷施外源EBR西瓜幼苗株高、根长、地上鲜重、地下鲜重较PEG胁迫分别增加了2.41%、36.76%、1.88%和3.42%;而且也增强光合作用各项指标,抗氧化酶(POD和SOD)活性。油菜素内酯(BRs)信号转导途径关键应答基因BRI1、BIN2、BES1和DWF4的表达量也呈现不同程度变化,抗旱相关基因CDSP32和MYB101的表达量也有显著变化。【结论】外源EBR能够有效缓解干旱胁迫对西瓜幼苗造成的损害,从而提高西瓜幼苗的抗旱性。

不同季节长毛兔部分血清生化指标变化分析

长毛兔生产受季节变化,特别是夏季受热应激的影响,而血清生化指标是反映这一变化的潜在指标。文章分析了不同季节(春季、夏季和秋季)和性别(公、母)长毛兔血清生化指标水平的变化差异,旨在探明季节对长毛兔生化指标水平的影响,筛选获得热应激相关指标,从而指导长毛兔夏季生产。结果表明,长毛兔公、母兔的血清碱性磷酸酶(ALP)水平变化规律相似,均为夏季降低,秋季回升;公、母兔的肌酸肌酶(CK)水平均为8月初大幅上升,8月中旬显著下降,秋季又回升;公、母兔的乳酸脱氢酶(LDH)水平在8月初均较大幅度上升,公兔8月中旬继续显著上升至秋季恢复正常,而母兔8月中旬即恢复正常。公兔的总蛋白(TP)在8月初无变化,而8月中旬和秋季显著升高(P<0.05),母兔无显著变化(P>0.05);8月初公、母兔的白蛋白(ALB)均小幅下降后逐渐显著上升(P<0.05);公兔的尿素(UREA)水平季节变化不明显(P>0.05),母兔秋季UREA水平低于其他季节。公兔的丙氨酸氨基转移酶(ALT)和天门冬氨酸氨基转移酶(AST)均无季节性差异(P>0.05),母兔ALT和AST水平均在8月中旬最低(P<0.05);公兔AST/ALT比值随热应激逐渐上升,8月中旬显著高于春季(P<0.05),秋季恢复,母兔AST/ALT比值8月初即大幅上升,而后基本恢复正常。综上,长毛兔热应激相关的主要变化指标有ALP、ALB、LDH和AST/ALT比值;公兔应激持久,而母兔敏感却恢复较快。