Three-Dimensional and Cross-sectional Characteristics of Normal Grain Growth Based on Monte Carlo Simulation

An appropriate Monte Carlo method was developed to simulate the three-dimensional normal grain growth more completely. Comparative investigation on the three-dimensional and the cross-sectional characteristics of normal grain growth was done. It was found that the time exponent of grain growth determined from cross-section exhibits the same rule of increasing slowly with time and approaching the theoretical value n = 0.5 of steadygrain growth as the three-dimensional (3-D) system. From change of the number of grains per unit area with timemeasured in cross-section, the state of 3-D normal grain growth may be predicted. The gtain size distribution incross-section is different from that in 3-D system and can not express the evolution characteristic of the 3-D distribution. Furthermore, there exists statistical connection between the topological parameters in cross-section and thosein three-dimensions.

Influence of Cross-Inoculation on Groundnut and Bambara Groundnut-<i>Rhizobium</i>Symbiosis: Contribution to Plant Growth and Yield in the Field at Sarh (Chad) and Ngaoundere (Cameroon)

In the context of sustainable research aiming at improving seed yield and maintaining soil fertility, a study on cross-inoculation of groundnut (Arachis hypogaea L.) and Bambara groundnut (Vigna subterranean (L.) Verd.) with rhizobia strains from four crop legumes was carried out at Sarh (Chad) and Ngaoundere (Cameroon). The experiment was conducted in each site following a randomized complete block design with 6 treatments known as the control, and 5 cross-inoculation formulations (RA, RN, RS, RV and MR), each of which was replicated thrice. Results obtained show that cross-inoculation contributed to the improvement of growth (plant sizes and biomasses) of the two crop legumes, as well as their seed yield at harvest. The enhanced yield expressed in kg/ha varied from 9.83% to 63.73% for groundnut and 72.71% for Bambara groundnut. These findings suggest that groundnut and Bambara groundnut do have a symbiotic affinity with rhizobia from other crop legumes. Whereas Groundnut, Cowpea, Soybean, Bambara groundnut rhizobia (GR, CR, SR, BR) alone, and the fourth in a mixture (RM) could be used to help improving groundnut seed yields;this mixture would not be indicated for intensive cultivation of Bambara groundnut later.

Growth Performance of Different Cross Combinations of Quality Lean Type Pig

Ten healthy weaning piglets of Landrace x Yorkshire （LY） in good body condition with body weight of （24 ± 1.27） kg were selected, and ten weaning piglets of Berkshire × LY （BLY） and Duroc × LY （DLY） with similar situation were also selected respectively to study the growth performance of different cross combinations. Three groups of experimental pigs were bred with conventional diet. The results showed that the average dry matter intakes of combinations of BLY and DLY were slightly decreased by 4.97% and 5.47% compared with the combination of LY, while average daily gain was significantly increased by 3.13% and 1.14%, and feed-weight ratio was decreased by 7.94% and 6.35%, respectively; economic benefit per pig was increased by 0.61 and 0.41 yuan, respectively. The combinations of BLY and DLY have better growth performance, which can be promoted in the production.

Use of Cross-Fostering to Enhance Growth of Pigs That Are Predicted to Grow Poorly Based on Plasma α-1 Acid Glycoprotein Concentration

Porcine α-1 acid glycoprotein (AGP) in newborn pigs can be used to predict growth rate through weaning and is a marker for growth impairment. This study examined whether nutritional support can improve the growth rate of piglets identified as having poor growth potential. Cross-fostering (CF) and CF plus a milk supplement (CF + MS) were used to attempt to improve the growth performance of pigs. Blood was collected at d1 post-parturition for measurement of plasma AGP for all pigs in 28 litters contributing to the experiment. Piglets with the highest plasma AGP level were weight and sex matched to a littermate with a low plasma AGP concentration and four pairs of these weight and sex matched pigs were grouped into four foster litters per treatment (control, CF, CF + MS). The control group was assembled by pairing littermates remaining in donor litters. Pigs stayed on treatment until weaning at 21 days of age. At 35 days of age, dual energy X-ray absorptiometry (DXA) was performed on CF and CF + MS pigs to evaluate carcass composition. Control pairs differed in weaning weight, with pigs with higher plasma AGP at 1 day of age having smaller weaning weights than their littermates of similar birth weight (P < 0.05). However, CF eliminated the difference in weaning weight between the slow growing pigs and their birth weight matched littermates. CF + MS produced a similar effect as CF (P > 0.05). At 35 days of age, body weights were still similar between CF littermates and between CF + MS littermates (P > 0.05). DXA analysis demonstrated that body composition was similar between CF or CF + MS treated pigs and their littermates. These data demonstrate that CF can be used to correct the growth impairment in pigs predicted using plasma AGP as the marker. CF + MS can do the same, but at greater expense.

基于主成分分析的二元杂交鸽生长性能和繁殖性能评价

为评价石歧鸽、白卡奴鸽、欧洲肉鸽三个品种鸽不同二元杂交组合的生长性能和繁殖性能,寻求最佳二元杂交组合,试验设置XL组合[石歧鸽(X)■×欧洲肉鸽(L)♀]、XY组合[石歧鸽(X)■×白卡奴鸽(Y)♀]、LY组合[欧洲肉鸽(L)■×白卡奴鸽(Y)♀]和LX组合[欧洲肉鸽(L)■×石歧鸽(X)♀],每个组合170对,进行为期1年的生长性能和繁殖性能统计,比较产蛋间隔、产蛋窝次、年产蛋数、无精蛋数、死胚数、出雏数、出栏乳鸽数、死雏数、受精率、出雏率、成活率、公鸽重、母鸽重、28日龄乳鸽体重等指标,运用主成分分析方法进行杂交组合的综合评价和优良组合的筛选。结果表明:XY组合的产蛋间隔最短(25.50 d),极显著低于LY组合(31.28 d)和LX组合(30.67 d,P<0.01);XY组合的年产蛋数最多(22.69个),极显著高于LY组合(21.28个,P<0.01);LY组合受精率最高为88.96%,极显著高于XY组合(83.51%,P<0.01),显著高于XL组合(84.57%,P<0.05);XY组合出栏乳鸽数最多,为13.57只。产蛋窝次、产蛋数、无精蛋数和死胚数与产蛋间隔之间呈强负相关,产蛋数、无精蛋数、死胚数与产蛋窝次之间呈强正相关,乳鸽重与公鸽重和母鸽重之间呈强正相关,XL组合的公母鸽体重均较重,因此该组合的乳鸽体重最重(547.65 g)。LX组合死淘率低,出栏数相对较多,且28日龄乳鸽体重较重。从繁殖性能中提取了三个主成分,分别为产蛋因子、乳鸽数因子、乳鸽体重因子,LX组合产蛋因子得分较高,LX组合乳鸽数因子较高。说明LX组合适合于肉鸽生产;XY组合产蛋量高,适合于蛋用鸽生产。

Emodin regulating excision repair cross-complementation group 1 through fibroblast growth factor receptor 2 signaling

AIM: To investigate the molecular mechanisms underlying the reversal effect of emodin on platinum resistance in hepatocellular carcinoma. METHODS: After the addition of 10 μmol/L emodin to HepG2/oxaliplatin (OXA) cells, the inhibition rate (IR), 50% inhibitory concentration (IC 50 ) and reversal index (IC 50 in experimental group/IC 50 in control group) were calculated. For HepG2, HepG2/OXA, HepG2/OXA/T, each cell line was divided into a control group, OXA group, OXA + fibroblast growth factor 7 (FGF7) group and OXA + emodin group, and the final concentrations of FGF7, emodin and OXA in each group were 5 ng/mL, 10 μg/mL and 10 μmol/L, respectively. Single-cell gel electrophoresis was conducted to detect DNA damage, and the fibroblast growth factor receptor 2 (FGFR2), phosphorylated extracellular signal-regulated kinase 1/2 (p-ERK1/2) and excision repair cross-complementing gene 1 (ERCC1) protein expression levels in each group were examined by Western blotting. RESULTS: Compared with the IC50 of 120.78 μmol/L in HepG2/OXA cells, the IC 50 decreased to 39.65 μmol/L after treatment with 10 μmol/L emodin; thus, the reversal index was 3.05. Compared with the control group, the tail length and Olive tail length in the OXA group, OXA + FGF7 group and OXA + emodin group were significantly increased, and the differences were statistically significant (P < 0.01). The tail length and Olive tail length were lower in the OXA + FGF7 group than in the OXA group, and this difference was also statistically significant. Compared with the OXA + FGF7 group, the tail extent, the Olive tail moment and the percentage of tail DNA were significantly increased in the OXA + emodin group, and these differences were statistically significant (P < 0.01). In comparison with its parental cell line HepG2, the HepG2/OXA cells demonstrated significantly increased FGFR2, p-ERK1/2 and ERCC1 expression levels, whereas the expression of all three molecules was significantly inhibited in HepG2/ OXA/T cells, in which FGFR2 was silenced by FGFR2 shRNA. In the examined HepG2 cells, the FGFR2, p-ERK1/2 and ERCC1 expression levels demonstrated increasing trends in the OXA group and OXA + FGF7 group. Compared with the OXA group and OXA + FGF7 group, the FGFR2, p-ERK1/2, and ERCC1 expression levels were significantly lower in the OXA + emodin group, and these differences were statistically significant. In the HepG2/OXA/T cell line that was transfected with FGFR2 shRNA, the FGFR2, p-ERK1/2 and ERCC1 expression levels were significantly inhibited, but there were no significant differences in these expression levels among the OXA, OXA + FGF7 and OXA + emodin groups. CONCLUSION: Emodin markedly reversed OXA resistance by enhancing OXA DNA damage in HepG2/OXA cells, and the molecular mechanism was related to the inhibitory effect on ERCC1 expression being mediated by the FGFR2/ERK1/2 signaling pathway.

经济增长目标调整促进了资本流动吗——基于企业跨地区投资的视角

地方政府“为增长而竞争”的发展模式是造成市场分割的重要因素,那么经济增长目标下调能否缓解这一局面、促进要素资源自由流通?为了回答这一问题,本文以上市公司在异地设立子公司的行为衡量资本要素的流动性,系统考察经济增长目标下调对企业跨地区投资的影响。研究发现,经济增长目标下调能够促进资本流动,表现为经济增长目标下调显著提升了辖区内上市公司设立异地子公司的比例;影响机制分析表明,经济增长目标下调提高了政府放权意愿,降低了市场分割程度,进而促进了企业跨地区投资;进一步的异质性分析揭示,在地区行政壁垒较低、行业竞争程度较高及民营企业样本中,经济增长目标下调对企业跨地区投资的促进作用更加明显。本文丰富了制度性政府行为影响资源配置的相关研究,为当前推进全国统一大市场建设提供了直接的政策思路。

国有企业稳增长:跨周期调节机理与实施路径

稳增长是国有企业的核心功能之一。文章从跨周期调节视角论述了国有企业稳增长的内在机理、经验事实与实施路径,研究发现:国有企业稳增长要坚持发挥国家发展规划的战略导向作用,以做实做强做优实体经济为着力点,以促进经济增长方式转变、结构优化、动力转换为重点,坚持稳中求进方法论,促进高质量发展;国有企业在基础设施、科技创新、区域平衡发展、收入分配、社会责任等领域的跨周期调节表现较为突出;新发展阶段,国有企业稳增长的实施路径包括:拓展有效投资空间和领域、优化国有资本空间行业布局、发挥价格调节机制在降低宏观经济运行成本中的基础性作用、提供更多高质量的基本公共产品和服务。

不同杂交组合肉鸡生长曲线拟合及分析

通过对不同杂交组合肉鸡生长发育规律的研究,旨在为小型优质肉鸡品种选育提供参考。以AA肉鸡与R132、F112两个肉鸡品系杂交后代以及与G1、G3、C4三个蛋鸡品系杂交后代为试验组,白羽肉鸡WOD168为对照组,采用Logistic、Gompertz和Bertalanffy 3种模型对各组试验鸡进行生长曲线拟合。结果:6组试验鸡3种生长曲线模型拟合度(R^(2))均大于0.99。Gompertz和Bertalanffy模型的R~2均大于Logistic模型。进一步从统计学参数及其生物学意义角度评价可知,Gompertz模型是3种模型中拟合效果最好的。Gompertz模型拟合AA×R132、AA×F112、AA×G1、AA×G3、AA×C4和WOD168组的R~2分别为0.999、0.999、0.999、0.998、0.999和0.999,拐点体重分别为1 789.97、2 073.82、1 516.83、1 769.91、1 336.01和1 792.47 g,拐点周龄分别为5.75、6.30、7.19、7.20、6.38和7.64周,以AA×G3组拐点周龄和体重与WOD168组最为接近。本研究表明,3种模型均可用于不同杂交组合肉鸡生长曲线拟合及分析,以Gompertz模型的拟合效果最好,AA×G3组生长曲线最佳。

跨境资本流动与东道国收入分配——来自跨国面板数据的经验证据

本文基于57个经济体1990-2019年的跨国面板数据,实证检验了各种类型的跨境资本流动对东道国收入分配的影响。研究结果显示:第一,整体而言,FDI改善了东道国的收入分配,证券投资与其他投资对收入分配的影响并不显著;第二,FDI对收入分配的改善作用在发达程度较高、金融市场更完善的经济体以及2008年金融危机发生后更为显著;最后,资本账户开放程度的提高有利于促进FDI对东道国收入分配的改善。根据上述结论,本文为如何更好地利用跨境资本流动来改善中国的收入分配提出了政策建议。

基于GAMLSS方法构建新疆维吾尔自治区部分地区10~13岁儿童生长曲线

目的 确定新疆维吾尔自治区部分地区儿童体格检测指标的百分位参考值和生长曲线,为新疆维吾尔自治区部分地区儿童生长发育评价和肥胖的识别提供参考依据。方法 利用分层随机整群抽样方法对2327名10~13岁儿童进行了一项体格测量的横断面研究。采用位置、尺度和形状的广义加性模型(GAMLSS)构建不同体格指标生长曲线。以BMI>P95,TMI> P95,腰围>P90,腰高比≥0.5设置为肥胖的阈值,评价儿童肥胖。BMI和腰围临界值与国家学龄儿童青少年肥胖筛查标准进行比较。结果 男女生身高、体重、臀围随年龄增加而增加,TMI和腰高比随年龄增加而下降。10~13岁儿童使用BMI、TMI、腰围、腰高比的肥胖检出率分别为男生:7.8%、7.2%、12.4%和16.9%,女生:7.2%、6.7%、11.5%和8.8%。男生:BMI肥胖临界值10岁阶段高于国家筛查标准,11~13岁低于国家筛查标准,腰围肥胖临界值均高于国家筛查标准;女生:BMI肥胖临界值均低于国家筛查标准,腰围肥胖临界值10~12岁高于国家筛查标准,13岁阶段低于国家筛查标准。结论 新疆部分地区学龄儿童以腰围判断肥胖的临界值高于国家标准,建议针对儿童肥胖的预防与管理中加强对腰围的关注。

跨境电商对我国经济增长的影响——基于省级面板数据实证分析

跨境电商作为贸易新业态,能够很好地改善传统贸易方式、激发国内市场活力、扩大国内市场需求,同时也为促进我国经济增长注入新活力。采用我国2012—2021年省级面板数据,通过构建跨境电商指标体系,研究跨境电商对于我国经济增长的影响效应,同时还采用门槛效应模型来研究跨境电商交易额对我国经济增长是否存在非线性关系。研究结果表明,在做基准回归时,跨境电商对我国经济增长具有显著的促进作用。考虑控制变量的情况下,促进作用仍然存在。将跨境电商划分行业发展、运输物流、政策管理三维度,分别研究对我国经济增长影响,结果表明都产生显著的正向影响。在进行面板门槛效应回归时发现,跨境电商交易额对我国经济增长存在单一门槛效应,超过门槛值影响系数变大,表明跨境电商交易额对我国经济增长存在边际效用递增的影响。从加大跨境电商综合试验区的设立、推进跨境电商基础设施建设、推进跨境电商技术人才培养以及提升互联网信息化水平这四个方面提出完善跨境电商发展的相关建议。

中国纺织业跨境电商集聚及其对区域经济增长的影响分析

跨境电商已成为产业升级、地区发展的重要路径。采用空间基尼系数和区位熵指数,测度2012—2021年全国31省/市的纺织业跨境电商集聚水平,探索其对区域经济增长的影响效应。结果表明:在考察期内纺织业跨境电商产业集聚现象突出,但集聚程度呈现下降趋势;分地区看,江苏、浙江、河北、湖北4省的集聚度高且增速较快,产业竞争优势较大,山东省集聚度也较为明显但逐渐丧失产业竞争优势;从影响效应看,纺织业跨境电商集聚能够促进区域经济增长。作为新型贸易方式的跨境电商集聚发展对区域经济增长的促进作用已经较为明显,对区域产业发展政策的制定有借鉴意义。

新疆杨树和柳树上壳囊孢属真菌的致病性分析

【目的】研究分离自杨树(Populus spp.)与柳树(Salix spp.)上壳囊孢属(Cytospora spp.)真菌的致病性。【方法】将前期鉴定的13种壳囊孢属真菌的代表菌株,通过离体枝条烫伤法将菌饼接种于新疆杨(Populus alba)和白柳(Salix alba)上,测量病斑面积并比较不同种壳囊孢属真菌的致病性。【结果】菌株2067-3(Cytospora nivea)和1579-1(C.chrysosperma)在新疆杨和白柳上的致病性最强,病斑面积最高分别为6021.30和5661.87 mm^(2)。选择5种分离自杨树与柳树的壳囊孢属真菌,分别接种至新疆杨与白柳的离体枝条上,新疆杨离体枝条的病斑面积明显大于白柳离体枝条的病斑面积;选3种分离自杨树的壳囊孢属真菌与5种分离自柳树的壳囊孢属真菌交互侵染后均能致病,并且致病性显著差异。分离自柳树的菌株2191-2(C.leucostoma)、1010-1(C.salicacearum)在杨树上的致病性高于分离自柳树的壳囊孢属真菌。【结论】分离自杨树和柳树的13种壳囊孢属真菌均能在杨树和柳树上致病,且致病性存在显著性差异。

留守初中生抑郁症状对非自杀性自伤行为影响的纵向研究

目的 评估留守初中生抑郁症状与非自杀性自伤行为变化趋势,探讨二者发展关系及时序效应。方法 通过多阶段分层整群随机抽样,使用儿童抑郁量表(CDS)和青少年非自杀性自伤评定问卷(ANSAQ),对372名留守初中生进行为期1年的3次纵向调查。结果 留守初中生抑郁症状和非自杀性自伤行为呈线性增长。抑郁初始水平正向预测非自杀性自伤初始水平与增长速率(β=0.473,β=0.577;P<0.01),抑郁增长速率正向预测非自杀性自伤增长速率(β=0.806,P<0.001);交叉滞后回归分析显示:Tn抑郁可正向预测Tn+1非自杀性自伤行为(β=0.365,β=0.322;P<0.001),Tn非自杀性自伤行为不能预测Tn+1抑郁(β=0.117,β=0.094;P>0.05)。结论 留守初中生抑郁症状和非自杀性自伤行为随时间不断增长,抑郁症状是非自杀性自伤的前因变量,抑郁症状可预测非自杀性自伤发生。

高等教育与职业教育跨界:逻辑起点、空间基础与推进路径

高等教育与职业教育跨界的内涵包括跨界生长和跨以成人。其目的在于完善人才培养体系,实现人自由而全面的发展。其作用在于对内推动高质量高等教育体系建设,对外促推产业结构转型升级。其最终形态是要达成高等教育与职业教育“自组织”与跨界社会“他组织”融合共生的“超组织”。体系、知识、师资和理念的内部边界,以及高等教育与职业教育和产业的外部边界的存在,不仅是高等教育与职业教育彰显存在价值的必要前提,也是构成高等教育与职业教育跨界的空间基础。实践中,需要加大政策制度保障,遵循系统跨界理念,建设信息对称机制以及构筑协同治理格局。

生长激素联合宫腔用交联透明质酸钠凝胶用于宫腔粘连分离术后辅助治疗的临床疗效观察

目的探讨生长激素联合宫腔用交联透明质酸钠凝胶用于宫腔粘连分离术(TCRA)后辅助治疗的临床疗效。方法选取2020年7月至2021年12月在重庆大学附属三峡医院诊断为中重度宫腔粘连的病人60例,采用随机数字表法分为观察组和对照组,每组30例,两组均实施宫腔镜下TCRA,术后均予以雌孕激素序贯治疗。对照组手术结束后宫腔内灌注交联透明质酸钠凝胶;观察组在对照组基础上术后采用生长激素皮下注射;所有病人随访月经恢复情况及妊娠情况,在术后1个月、3个月行宫腔镜检查了解宫腔情况及再粘连情况,术后3个月(月经周期第10~15天)行超声检查了解子宫内膜厚度、子宫动脉搏动指数(PI)、子宫动脉血流阻力指数(RI)。结果术后1个月,观察组轻度粘连2例、中度粘连1例,对照组轻度粘连7例、中度粘连3例;术后3个月,观察组轻度粘连4例、中度粘连2例,对照组轻度粘连10例、中度粘连4例,观察组的再粘连率显著低于对照组(P<0.05)。术后观察组的子宫内膜厚度(7.47±1.08)mm也较对照组(6.83±1.21)mm明显增厚(P<0.05),观察组的RI、PI也明显低于对照组,首次妊娠时间也明显短于对照组,均差异有统计学意义(P<0.05)。两组病人在治疗后的妊娠率及月经恢复情况差异无统计学意义(P>0.05)。结论生长激素联合宫腔用交联透明质酸钠凝胶,作为宫腔粘连术后的辅助治疗,能有效促进子宫内膜修复、减少再粘连,值得临床推广。

连续跨国并购情景下民营企业适应性成长路径与机制——基于美的股份的探索性案例研究

以科技自立自强与创新驱动为视角,以美的股份1999~2017年连续跨国并购实现适应性成长过程为研究样本,采用探索性单案例研究,探讨连续跨国并购情景下中国民营企业适应性成长的路径与机制。研究首先梳理企业成长路径、企业成长压力、适应性成长机制研究现状,然后以一手数据与二手数据相结合的方式构建美的股份成长原始数据库,其次遵循研究现状对原始数据一阶/二阶编码后进行结构化数据分析,得出了在中国民营企业连续跨国并购实现适应性成长过程中,成长路径呈现“核心产品创新能力-关键领域创新能力-核心产业跨领域创新能力”的动态演化过程,“替换机制-转移机制-升级机制”依次发挥作用。研究结果丰富了中国民营企业适应性成长理论研究,为中国民营企业克服成长压力,实现科技自立自强提供管理启示。

IGF-1、β-CTX与胫骨平台骨折术后感染及骨痂X线评分的关系

目的分析血清胰岛素样生长因子-1(IGF-1)、β-Ⅰ型胶原羧基端肽(β-CTX)水平与胫骨平台骨折患者术后感染及骨痂X线评分的关系。方法回顾性分析2020年1月至2023年1月北京市仁和医院收治的90例胫骨平台骨折患者的临床资料,根据术后感染情况分为感染组(n=23例)和未感染组(n=67例)。对比两组的临床资料,应用二元Logistic回归模型分析胫骨平台骨折患者术后感染影响因素;采用Spearman相关系数分析IGF-1、β-CTX与术后3个月的骨痂X线评分的相关性,绘制受试者工作特征(ROC)曲线分析IGF-1和β-CTX对患者术后骨折愈合情况的预测价值。结果两组一般资料中性别、损伤机制、骨质疏松情况、合并糖尿病情况、手术时间、联合应用抗生素情况以及住院天数比较差异均无统计学意义(P>0.05);感染组中年龄≥60岁、开放性骨折损伤类型、有遗留死腔的比例均高于未感染组,血清IGF-1和β-CTX水平均低于未感染组,差异有统计学意义(P<0.05);骨痂X线分级Ⅰ~Ⅱ级患者的血清IGF-1和β-CTX水平低于骨痂X线分级Ⅲ~Ⅳ级患者,差异有统计学意义(P<0.05);年龄≥60岁(OR=3.840,95%CI:1.803~8.178)、开放行骨折损伤类型(OR=3.656,95%CI:1.705~7.834)、有遗留死腔(OR=3.407,95%CI:1.670~6.955)、<中位数水平的血清IGF-1(OR=2.578,95%CI:1.388~4.789)和β-CTX(OR=2.550,95%CI:1.262~5.153)的胫骨平台骨折患者术后感染风险更高(P<0.05);血清IGF-1和β-CTX水平与胫骨平台骨折患者术后骨痂X线评分均呈正相关(r=0.671、0.699,P<0.05);血清IGF-1、β-CTX水平及二者联合预测胫骨平台骨折患者术后骨折愈合情况的AUC分别为0.799、0.832、0.884,敏感度分别为0.727、0.727、0.909,特异性分别为0.785、0.798、0.772。结论胫骨平台骨折患者术后感染情况与年龄、损伤类型、遗留死腔、血清IGF-1和β-CTX水平有关,临床可通过检测IGF-1和β-CTX水平变化预测患者术后骨折愈合情况。

X射线断层融合技术对股骨颈骨折股骨颈动力交叉钉系统内固定后疗效评估的价值

目的:通过常规X射线与X射线断层融合成像两种影像技术的比较,探讨X射线断层融合技术对股骨颈骨折股骨颈动力交叉钉系统(FNS)内固定后骨愈合和骨痂生长情况评估的应用价值。方法:选取2019年10月至2020年6月北京市海淀医院骨科收治的18例股骨颈骨折患者,所有患者均采用FNS内固定治疗,分别于术后1个月和12个月时行普通X射线和X射线断层融合成像,评价两种影像技术对股骨颈骨折FNS内固定术后骨愈合和骨痂生长情况的显示情况,统计两种影像技术对股骨颈骨折FNS内固定图像检测过程的相关参数。结果:在股骨颈骨折患者术后1个月时X射线断层融合成像技术的骨痂检出率均低于术后12个月,且X射线断层融合技术在患者术后1个月和12个月时的骨痂检出率(94.44%和61.11%)均高于X射线(61.11%和33.33%),差异有统计学意义(x2=5.100、5.790,P<0.05);经秩和检验显示,两种影像技术在股骨颈骨折患者术后1个月和12个月时的骨痂生长情况图像质量评分分布差异有统计学意义(Z=2.113,2.018,P<0.05),两种影像技术的术后1个月和12个月骨愈合图像质量比较,差异有统计学意义(Z=2.868、2.258,P<0.05);X射线断层融合技术成像引导的治疗前骨折处检测影像图显示效果理想,图像清晰,较完整清晰地显示出患者的骨折线,术后12个月X射线正侧位可见连续性骨痂通过骨折线,达临床愈合;X射线断层融合技术对股骨颈骨折FNS内固定图像检测过程的空气比释动能、剂量面积乘积以及有效剂量均低于常规X射线成像,差异均有统计学意义(t=5.900、2.466、32.255,P<0.05)。结论:在对股骨颈骨折FNS内固定后患者骨愈合情况的诊断评价中,使用X射线断层融合技术能够更好地对患者的骨痂生长情况进行检测,判定骨愈合程度,尤其是对术后恢复时间更长的判定效果更佳,且安全性较好,在检测过程中辐射损伤较小。