The impact of^(60)Co-γirradiation on the chemical constituents of Chuanxiong Rhizoma

Background:In order to clarify the inmpat ofγirradiation on the chemical composition of traditional Chinese medicine,this paper carefully choosed Chuanxiong Rhizoma to carry on a demonstration study.Methods:Through a meticulous assessment,a comprehensive comparison was made between the irradiated and unirradiated Chuanxiong Rhizoma samples.The property characteristics were investigated by colorimeter and electronic nose.The changes in chemical structures and contents was analyzed by fourier infrared spectroscopy,high performance liquid chromatography and fingerprinting.In a quest to uncover the presence of any new radiolysis products,cutting-edge techniques like ultra performance liquid chromatography-quadrupole-time of flight-mass spectrometry and gas chromatography-mass spectrometry were employed.Moreover,the difference of antioxidant activity were investigated.Results:The irradiation doses within 12 kGy had no significant effects on the content of the main chemical components,characteristics and in vitro antioxidant activity of Chuanxiong Rhizoma,while changes in some functional groups and degradation of some volatile oil components containing olefins need further study.Conclusion:This study indicates that^(60)Co-γirradiation is a stable method for sterilization of Chuanxiong Rhizoma.It’s also provide a reference for the establishment of irradiation standards for Chuanxiong Rhizoma and other aromatic medicinal plants.

Neutron irradiation influence on high-power thyristor device under fusion environment

Because of their economy and applicability,high-power thyristor devices are widely used in the power supply systems for large fusion devices.When high-dose neutrons produced by deuterium–tritium(D–T)fusion reactions are irradiated on a thyristor device for a long time,the electrical characteristics of the device change,which may eventually cause irreversible damage.In this study,with the thyristor switch of the commutation circuit in the quench protection system(QPS)of a fusion device as the study object,the relationship between the internal physical structure and external electrical parameters of the irradiated thyristor is established.Subsequently,a series of targeted thyristor physical simulations and neutron irradiation experiments are conducted to verify the accuracy of the theoretical analysis.In addition,the effect of irradiated thyristor electrical characteristic changes on the entire QPS is studied by accurate simulation,providing valuable guidelines for the maintenance and renovation of the QPS.

In situ TEM investigation of electron irradiation and aging-induced high-density nanoprecipitates in an Mg-10Gd-3Y-1Zn-0.5Zr alloy

In-situ electron irradiation and aging are applied to introduce high-density precipitates in an Mg-10Gd-3Y-1Zn-0.5Zr(GWZ1031K,wt.%)alloy to improve the hardness.The results show that the hardness of the Mg alloy after irradiation for 10 h and aging for 9 h at 250℃ is 1.64 GPa,which is approximately 64% higher than that of the samples before being treated.It is mainly attributed to γ'precipitates on the basal plane after irradiation and the high-density nanoscale β'precipitates on the prismatic plane after aging,which should be closely related to the irradiation-induced homogenous clusters.The latter plays a key role in precipitation hardening.This result paves a way to improve the mechanical properties of metallic materials by tailoring the precipitation through irradiation and aging.

Microwave irradiation-induced alterations in physicochemical properties and methane adsorption capability of coals:An experimental study using carbon molecular sieve

In order to comprehend the applicability of microwave irradiation for recovering coalbed methane,it is necessary to evaluate the microwave irradiation-induced alterations in coals with varying levels of metamorphism.In this work,the carbon molecular sieve combined with KMnO_(4)oxidation was selected to fabricate carbon molecular sieve with diverse oxidation degrees,which can serve as model substances toward coals.Afterwards,the microwave irradiation dependences of pores,functional groups,and highpressure methane adsorption characteristics of model substances were studied.The results indicated that microwave irradiation causes rearrangement of oxygen-containing functional groups,which could block the micropores with a size of 0.40-0.60 nm in carbon molecular sieve;meanwhile,naphthalene and phenanthrene generated by macro-molecular structure pyrolysis due to microwave irradiation could block the micropores with a size of 0.70-0.90 nm.These alterations in micropore structure weaken the saturated methane adsorption capacity of oxidized carbon molecular sieve by 2.91%-23.28%,suggesting that microwave irradiation could promote methane desorption.Moreover,the increased mesopores found for oxidized carbon molecular sieve after microwave irradiation could benefit CH4 diffusion.In summary,the oxidized carbon molecular sieve can act as model substances toward coals with different ranks.Additionally,microwave irradiation is a promising technology to enhance coalbed methane recovery.

Two-dimensional particle-in-cell modeling of blow-off impulse by X-ray irradiation

Space objects such as spacecraft or missiles may be exposed to intense X-rays in outer space,leading to severe damage.The reinforcement of these objects to reduce the damage caused by X-ray irradiation is a significant concern.The blow-off impulse(BOI)is a crucial physical quantity for investigating material damage induced by X-ray irradiation.However,the accurate calculation of BOI is challenging,particularly for large deformations of materials with complex configurations.In this study,we develop a novel two-dimensional particle-in-cell code,Xablation2D,to calculate BOIs under far-field X-ray irradiation.This significantly reduces the dependence of the numerical simulation on the grid shape.The reliability of this code is verified by simulation results from open-source codes,and the calculated BOIs are consistent with the experimental and analytical results.

Review on synergistic damage effect of irradiation and corrosion on reactor structural alloys

The synergistic damage effect of irradiation and corrosion of reactor structural materials has been a prominent research focus.This paper provides a comprehensive review of the synergistic effects on the third-and fourth-generation fission nuclear energy structural materials used in pressurized water reactors and molten salt reactors.The competitive mechanisms of multiple influencing factors,such as the irradiation dose,corrosion type,and environmental temperature,are summarized in this paper.Conceptual approaches are proposed to alleviate the synergistic damage caused by irradiation and corrosion,thereby promoting in-depth research in the future and solving this key challenge for the structural materials used in reactors.

Effect of high-energy Ne ions irradiation on mechanical properties difference between Zr_(63.5)Cu_(23)Al_(9)Fe_(4.5)metallic glass and crystalline W

In this paper,high-energy Ne ions were used to irradiate Zr_(63.5)Cu_(23)Al_(9)Fe_(4.5) metallic glass(MG)and crystalline W to investigate their difference in mechanical response after irradiation.The results showed that with the irradiation dose increased,the tensile micro-strain increased,nano-hardness increased from 7.11 GPa to 7.90 GPa and 8.62 GPa,Young’s modulus increased,and H3/E2 increased which indicating that the plastic deformability decreased in crystalline W.Under the same irradiation conditions,the Zr_(63.5)Cu_(23)Al_(9)Fe_(4.5) MG still maintained the amorphous structure and became more disordered despite the longer range and stronger displacement damage of Ne ions in Zr_(63.5)Cu_(23)Al_(9)Fe_(4.5) MG than in crystalline W.Unlike the irradiation hardening and embrittlement behavior of crystalline W,Zr_(63.5)Cu_(23)Al_(9)Fe_(4.5) MG showed the gradual decrease in hardness from 6.02 GPa to 5.89 GPa and 5.50 GPa,the decrease in modulus and the increase in plastic deformability with the increasing dose.Possibly,the irradiation softening and toughening phenomenon of Zr_(63.5)Cu_(23)Al_(9)Fe_(4.5) MG could provide new ideas for the design of nuclear materials.

Effect of three-volt moxibustion with helium-neon laser irradiation on quality of care in patients with lumbar radiculopathy spondylosis

BACKGROUND Lumbar radiculopathy spondylosis is a relatively common orthopedic disease with a high incidence rate.It most commonly occurs in the lumbar 4-5 and lumbar 5-sacral 1 vertebrae,which account for approximately 95%of cases.It mostly occurs in people aged 30-50 years old and greatly affects their quality of life.AIM To determine the effect of triple-voltage acupuncture combined with helium-neon laser irradiation on the quality of care and improvement of symptoms in patients with lumbar radiculopathy spondylolisthesis.METHODS In this study,we selected 120 patients with lumbar radiculopathy spondylosis who were treated at our hospital between June 2019 to June 2020.The patients were divided into control and observation groups according to the random number table method,with 60 patients in each group.Patients in the observation group were treated with three-volt moxibustion combined with helium-neon laser irradiation,and those in the control group were treated with lumbar traction.After 1 month of treatment,the lumbar pain scores,lumbar spine motor functions,clinical treatment effects,and nursing satisfaction of the two groups were compared.RESULTS The results showed that acupuncture combined with laser irradiation significantly improved the patients'clinical symptoms,i.e.,reduced their low back pain,significantly lower numerical rating scale pain scores in the observation group than in the control group,and better lumbar spine motility than in the control group,compared to lumbar traction.In addition,they were cared for.The treatment effectiveness rate of the observation group was 95.5%,which was significantly higher than that of the control group(81.67%).Satisfaction with care was higher than 90 points in both groups,but the difference was not statistically significant.CONCLUSION Our study provides a clinical rationale for the future treatment of patients with lumbar spine disease.However,further extensive research is needed for validation.

Observation of therapeutic effect of lamp irradiation combined with purple gromwell oil gauze on alleviating intestinal colic in patients

BACKGROUND Intestinal colic is a common complication in patients who have undergone radical surgery for colorectal cancer.Traditional Chinese medicine has advantages,including safety and stability,for the treatment of intestinal colic.Lamp irra-diation for abdominal ironing has been applied in the treatment of many gas-trointestinal diseases.Purple gromwell oil has the effects of clearing heat,cooling blood,reducing swelling,and relieving pain.RESULTS The general effective rate in the observation group was 95.00%,which was significantly higher than that in the control group(86.67%,P<0.05).Before treatment,there was no significant difference in the duration of symptoms between the groups(P>0.05).After 1,2,3,and 4 d of treatment,the duration of symptoms in both groups were decreased,and the duration in the observation group was significantly lower than that in the control group(96.54±9.57 vs 110.45±11.23,87.26±12.07 vs 104.44±11.68,80.45±16.21 vs 99.44±14.95,73.18±15.58 vs 92.17±14.20;P<0.05).After 1,3,5,and 7 d of treatment,the NRS scores in both groups were decreased,and the NRS scores in the observation group were significantly lower than those in the control group(3.56±0.41 vs 4.04±0.58,3.07±0.67 vs 3.74±1.02,2.52±0.76 vs 3.43±0.85,2.03±0.58 vs 3.03±0.82;P<0.05).There was no significant difference in the rate of adverse reaction occurrence between the groups(P>0.05).CONCLUSION The use of lamp irradiation combined with purple gromwell oil gauze in patients with intestinal colic after radical surgery for colorectal cancer can reduce symptom duration,alleviate intestinal colic,and improve treatment efficacy,and this approach is safe.It is worth promoting the use of this treatment in clinical practice.

^(60)Co-γ射线对不同无花果品种一年生枝条的辐射效应分析

【目的】研究^(60)Co-γ射线对不同无花果品种一年生枝条死亡率、抗氧化酶活性等相关理化指标的影响,确定最佳辐射诱变剂量,为利用^(60)Co-γ射线辐射诱变技术提高无花果遗传多样性、创造新种质、培育优良新品种提供科学依据。【方法】以无花果品种布兰瑞克和中华紫果一年生休眠枝为试材,采用^(60)Co-γ射线为辐照源,设置不同剂量0、30、45、60、75 Gy的辐射处理,分析辐照引起枝叶死亡率、酶活性等变化。【结果】随着辐射剂量的增加,2个无花果品种扦插苗成活率呈下降趋势,株高、茎粗、节间长度、叶片长度、叶片宽度和分枝数指标呈下降趋势,叶片长宽比差异不显著。中华紫果品种的SOD、POD、CAT等酶活性均呈现先增后减的趋势,分别在45、60 Gy剂量时达到峰值,MDA含量呈现一直上升趋势,H_(2)O_(2)含量呈现先增后降趋势。布兰瑞克品种的SOD、POD、CAT酶活性,随着辐射剂量的增加均呈现先降后增趋势。MDA、H_(2)O_(2)含量基本保持上升趋势。【结论】辐射导致无花果扦插苗幼苗生长缓慢、株高矮化、茎粗变细、叶片变小、分枝减少。中华紫果的半致死辐射剂量为56 Gy,布兰瑞克为70 Gy,布兰瑞克对辐射的耐受性高于中华紫果。

含^(60)Co极低放土壤废物的填埋处置

在对四川省城市放射性废物库暂存的含^(60)Co极低放土壤废物进行源项分析的基础上确定了填埋处置方案。根据填埋处置方案对该批含^(60)Co极低放土壤废物进行了填埋,对填埋过程中工作人员受照剂量进行了估算。经计算,此次填埋操作过程中工作人员最大个人剂量为103.07μSv,满足相关剂量控制要求。

甘草查尔酮A对HL-60细胞恶性生物学行为的抑制作用及其机制

目的 探究甘草查尔酮A(LA)对急性髓系白血病(AML)细胞HL-60的作用及其机制。方法 将人AML细胞系HL-60细胞分为对照组、LA组(30μmol/L)、IL-6组(100 ng/mL,JAK2/STAT3信号通路激活剂)和LA+IL-6组。培养48 h后,采用MTT法和克隆形成实验检测HL-60细胞增殖活性;采用流式细胞术检测HL-60细胞周期分布和细胞凋亡;采用Transwell实验检测HL-60细胞侵袭和迁移;采用Western blot检测p21、p27、cyclin E2、CDK2、Bcl-2、Bax、cleaved-Caspase-3、p-JAK2,JAK2,p-STAT3和STAT3蛋白表达水平。结果 与对照组比较,LA组细胞活力、克隆形成数、侵袭和迁移细胞数均降低(P<0.05),Bcl-2、cyclin E2和CDK2蛋白表达量均降低(P<0.05),JAK2和STAT3蛋白的磷酸化水平均降低(P<0.05);G0/G1期细胞比例和细胞凋亡率均升高(P<0.05),p21、p27、Bax和cleaved Caspase-3蛋白表达量均升高(P<0.05)。与对照组比较,IL-6组细胞活力、克隆形成数、侵袭和迁移细胞数均升高(P<0.05),Bcl-2、cyclin E2和CDK2蛋白表达量均升高(P<0.05),JAK2和STAT3蛋白的磷酸化水平均升高(P<0.05),G0/G1期细胞比例和细胞凋亡率均降低(P<0.05),p21、p27、Bax和cleaved Caspase-3蛋白表达量均降低(P<0.05)。与IL-6组比较,LA+IL-6组细胞活力、克隆形成数、侵袭和迁移细胞数均降低(P<0.05),Bcl-2、cyclin E2和CDK2蛋白表达量均降低(P<0.05),JAK2和STAT3蛋白的磷酸化水平均降低(P<0.05),G0/G1期细胞比例和细胞凋亡率均升高(P<0.05),p21、p27、Bax和cleaved-Caspase-3蛋白表达量均升高(P<0.05)。LA+IL-6组和LA组间上述指标差异没有统计学意义。结论 甘草查尔酮A可抑制AML细胞系HL-60细胞增殖、侵袭和迁移,诱导细胞凋亡并将细胞阻滞在G0/G1期,其作用机制可能与抑制JAK2/STAT3信号通路激活有关。

^(60)Co-γ辐射对2种锦带幼苗生长及生理指标的影响

为了探究辐射诱变对“白花锦带花”和“锦带花”形态及生理特性的影响,采用不同剂量(0~300 Gy)的^(60)Co-γ射线辐射“白花锦带花”与“锦带花”休眠期种子,观测辐射对锦带花生长的影响,测定其生长量及幼苗叶片的叶绿素含量、叶绿素荧光指标、光合作用参数、SOD、POD、MDA和可溶性蛋白含量。研究结果显示,由于辐射剂量的增大,苗高、叶长、叶宽、节间距、叶绿素荧光、光合作用参数、SOD活性、POD活性出现了明显的先升高后降低的趋势,在50 Gy时到达了峰值。同时,随着辐射剂量的增加,叶绿素含量和可溶性蛋白含量呈现出下降的趋势,MDA含量明显升高。综上所述,在(2 Gy/min)剂量率的辐射条件下“白花锦带花”种子较适宜的诱变剂量为50 Gy,而“锦带花”以50~100 Gy最合适。

维持性腹膜透析患者血清CHI3L1、HSP60与钙磷代谢、冠状动脉钙化的关系

目的探讨维持性腹膜透析患者血清壳多糖酶3样蛋白1(CHI3L1)、热休克蛋白60(HSP60)与钙磷代谢、冠状动脉钙化的关系。方法选取2021年1月至2023年1月在周口市中心医院接受持续性非卧床腹膜透析或日间非卧床腹膜透析治疗>3个月的98例维持性腹膜透析患者作为研究对象,根据是否存在钙磷代谢异常分别分入钙磷正常组与钙磷异常组,根据多层螺旋CT结果参照Agatston评分法计算其冠状动脉钙化积分(CACS),将98例维持性腹膜透析患者再次分入未钙化组与钙化组,检测并对比两组患者的血清CHI3L1、血清HSP60水平。采用Pearson相关分析探讨血清CHI3L1、HSP60与钙磷代谢指标的关系,采用受试者工作特征(ROC)曲线评估血清CHI3L1、HSP60对维持性腹膜透析患者冠状动脉钙化的评估价值。通过多因素logistic逐步回归分析探讨维持性腹膜透析患者冠状动脉钙化的影响因素。结果98例维持性腹膜透析患者分为钙磷正常组(43例)、钙磷异常组(55例),钙磷代谢异常组患者血清CHI3L1、HSP60水平高于钙磷代谢正常组患者(P<0.05)。维持性腹膜透析患者血清CHI3L1、HSP60与钙磷乘积呈正相关(P<0.05)。根据多层螺旋CT结果参照Agatston评分法计算其CACS积分,将98例维持性腹膜透析患者分为未钙化组(37例)、钙化组(61例),钙化组患者血清CHI3L1、HSP60水平高于未钙化组患者(P<0.05)。血清CHI3L1、HSP60评估维持性腹膜透析患者预后的AUC分别为0.741、0.826,两者联合评估的AUC为0.915。钙化组患者低蛋白血症、高磷饮食人数及透析龄高于未钙化组(P<0.05)。多因素logistic回归分析显示:高磷饮食、透析龄、CHI3L1、HSP60是影响维持性腹膜透析患者冠状动脉钙化的危险因素(P<0.05)。结论血清CHI3L1、HSP60在钙磷代谢异常、发生冠状动脉钙化的维持性腹膜透析患者中均呈高表达,及早检测血清CHI3L1、HSP60水平有助于及时防治冠状动脉钙化。

血清HSP60、HSP70水平与原发性免疫性血小板减少症患儿Th17/Treg细胞和预后的关系

目的分析血清热休克蛋白60(HSP60)、热休克蛋白70(HSP70)与原发性免疫性血小板减少症(ITP)患儿辅助性T细胞17/调节性T细胞(Th17/Treg)和预后的关系。方法选取2020年6月—2022年6月保山市人民医院儿科诊治的ITP患儿128例作为病例组,另选同期体检健康儿童60例作为健康对照组。检测并比较2组血清HSP60、HSP70与Th17/Treg细胞水平。Pearson法分析血清HSP60、HSP70与Th17/Treg细胞的相关性。ITP患儿出院后随访1年,根据不同预后情况分为预后良好亚组(107例)和预后不良亚组(21例)。收集ITP患儿的临床资料,采用单因素、多因素Logistic回归模型分析ITP患儿预后的影响因素,并构建风险预测列线图模型。建立受试者工作特征(ROC)曲线分析血清HSP60、HSP70与Th17/Treg细胞对ITP患儿预后的预测价值。结果病例组血清HSP60、HSP70水平及Th17/Treg细胞显著高于健康对照组(t/Z/P=20.445/<0.001、17.467/<0.001、5.823/<0.001)。Pearson相关分析显示,血清HSP60、HSP70与Th17/Treg细胞呈正相关(r/P=0.417/<0.001、0.348/<0.001)。多因素Logistic回归分析显示,HSP60高、HSP70高、Th17/Treg高为ITP患儿预后不良的独立危险因素[OR(95%CI)=1.177(1.041~1.331),1.181(1.038~1.343),9.895(2.171~68.177)],初诊时PLT计数偏高则为保护因素[OR(95%CI)=0.848(0.726~0.990)]。ROC曲线分析结果显示,初诊时PLT、HSP60、HSP70、Th17/Treg水平及列线图模型的曲线AUC分别为0.793、0.730、0.787、0.840、0.975;Bootstrap法(B=1000)对列线图模型进行内部验证显示,Bias-corrected预测曲线与Ideal线基本重合,该模型预测能力较好。决策曲线显示,该模型的阈值概率范围为0.01~0.98,其净收益率>0,高于两条无效线。结论IPT患儿血清HSP60、HSP70、Th17/Treg水平均明显升高,血清HSP60、HSP70与Th17/Treg呈显著正相关。初诊时PLT、HSP60、HSP70、Th17/Treg水平是ITP患儿预后不良的影响因素,且基于HSP60、HSP70等独立危险因素构建的列线图模型对ITP患儿预后不良具有较好的预测价值。

60岁以下成年女性心理压力现状、影响因素及干预对策研究——以重庆市为例

回顾和梳理压力以及女性心理压力影响因素的相关文献,通过问卷调查对重庆市4270位60岁以下成年女性的心理压力程度进行分析,考察影响60岁以下成年女性心理压力的相关因素。通过有序Logistic回归分析发现,年龄、户籍、教育程度、年收入情况、工作时长、女性人才重视程度、对政策和制度的熟悉程度等变量显著影响着60岁以下成年女性的心理压力。研究结果显示:60岁以下成年女性中,农村户籍的女性心理压力显著高于城市户籍;年龄越大、工作时长越长,心理压力越大;受教育程度和年收入水平越高、女性人才重视程度越高、对政策和制度熟悉程度越高,心理压力越小。基于此,提出以下4条干预对策:重视低收入成年女性的心理问题;重视农村“留守中老年女性”的心理健康问题;重视企事业单位女性的心理健康问题;加强对成年女性心理健康教育、舆论引导及政策宣讲等。

基于响应面法的Ni60/WC涂层表面织构皮秒分束工艺参数预测研究

目的实现六分束激光在Ni60/WC涂层表面烧蚀目标织构激光加工工艺参数的精确选择。方法基于CCD响应面法,设计在不同的激光工艺参数下对Ni60/WC涂层表面进行织构烧蚀试验,以激光频率、扫描次数、扫描速度为影响因素,以圆凹坑织构直径、深度及由其直径和深度综合加权所得的综合目标为响应目标,建立目标织构所需激光工艺参数的预测模型,以织构直径、深度及综合目标作为优化条件,对预测模型进行实验验证。结果扫描次数对织构直径的影响最显著,单个脉冲光斑上所聚集的能量大小是影响织构直径误差的关键因素。对织构深度影响最显著为扫描次数和频率,织构深度与扫描次数、频率呈正相关,不同因素间的交互作用是影响织构加工结果的关键。通过对预测模型所优选的参数进行实验验证发现,以织构直径和深度、综合目标建立的预测模型优选工艺参数所加工圆凹坑织构的质量评价指标与其预测指标的误差率分别为19.37%、3.57%。功率为6 W时,六分束激光加工最优工艺参数为速度5500 mm/s、频率400 kHz、扫描2次。结论通过综合目标建立的Ni60/WC涂层表面圆凹坑织构六分束激光加工参数优选预测模型精确程度较高,能够实现Ni60/WC涂层表面加工所需织构激光参数的准确预测,为涂层表面织构加工激光参数精确选择提供了理论依据。

“30-60”双碳背景下新疆电解铝产业发展的风险识别与建议

近年来,凭借新疆丰富的能源优势,电解铝产业得到迅猛发展,并逐步形成了煤电铝一体化的发展格局。电解铝是高耗能、高碳排放行业,每生产1 t电解铝的碳素材料消耗量约为0.4 t,而其所产生的二氧化碳排放量则达到1.8 t。因此,必须采取相应措施来实现碳中和的目标。本文主要阐述了新疆地区电解铝行业主要存在的能源结构单一、交通运输成本高、电解铝产业链不完善等问题,识别并分析了碳达峰碳中和背景下新疆地区电解铝产业发展面临的挑战和风险,有针对性提出了新疆地区电解铝产业绿色低碳发展的路径与建议,为新疆电解铝产业实现跨越式、高质量发展提供参考。

南昌地区55~60周岁无偿献血者捐献血液的安全性和有效性研究

目的探讨55~60周岁无偿献血者捐献血液的安全性和有效性。方法通过江西省血液中心唐山9.0系统,研究2013年至2022年55~60周岁无偿献血者的献血不良反应发生情况和血液不合格情况。结果55~60周岁无偿献血者2018年至2022年献血不良反应发生率及2013—2022年整体的献血不良反应发生率均显著低于18~54周岁的无偿献血者,P<0.05;同时55~60周岁无偿献血者的血液不合格率无论是各年份间还是整体的血液不合格率都要显著低于18~54周岁的无偿献血者,P<0.05。结论55~60周岁的无偿献血者献血不良反应发生率低,且血液合格率更高,适宜献血。

不同剂量^(60)Co-γ射线辐照藜麦种子的效应研究

为了研究^(60)Co-γ射线辐照在藜麦育种中的应用,探讨^(60)Co-γ射线辐射诱变藜麦的适宜剂量,本研究利用4种剂量^(60)Co-γ辐射4个不同藜麦品种,对辐射后的种子进行室内发芽试验和田间种植试验,并对M1代的生育过程、畸变率、突变率进行了调查和分析。结果表明,经过150~450 Gy的辐照剂量处理后,藜麦的形态特征和生长表现出显著变化;发芽率呈先上升后下降的趋势,150 Gy剂量可促进种胚活力,250 Gy以上剂量显著降低发芽率;辐射导致出苗延迟,高剂量下甚至无法正常出苗,出苗率也显著降低,表明辐射对幼苗生长产生负面影响;成株率随辐射剂量增加而下降,幼苗自然枯死增多,说明辐射对发芽种子胚芽的继续发育抑制显著;辐射导致遗传变异,包括早熟、矮化、穗颜色等方面,突变频率随剂量增加而增加。综上可知,藜麦的生长、发芽、出苗、成株等受到辐射剂量影响,适度辐射可促进发芽,但高剂量对生长和遗传特性产生负面效应。本研究对于辐射育种的可行性和作物改良意义重大,但需深入研究其机制和应用潜力。