冷害对采后“大五星”枇杷果实贮藏品质及木质化败坏的影响     

付婷婷  秦文  张正周 《四川农业大学学报》2011,29(1)

研究冷害对采后"大五星"枇杷果实贮藏品质及木质化的影响,旨在阐明冷害温度下枇杷果实品质劣变,特别是木质化败坏的规律,为枇杷贮藏保鲜提供理论依据。"大五星"枇杷采后分别于冷害温度[(3±1)℃,简称3℃]和非冷害温度[(8±1)℃,简称8℃]贮藏30d,定期测定贮藏期间两组的品质及相关指标变化。结果表明,3℃条件下枇杷果实在第10天开始出现冷害症状,随后日趋严重,而在8℃条件下的果实30d内发生冷害程度很轻。冷害会加速枇杷采后失重率、膜透性、木质素、PAL、POD活性的上升,促进TSS、TA和VC含量下降。  相似文献   

依达拉奉对大鼠脑缺血-再灌注损伤的神经保护作用     

邱宗琴  ;冯涛  ;张玉丰  ;樊有忠 《吉林林学院学报》2007,(5):402-404

目的研究自由基清除剂依达拉奉对大鼠脑缺血-再灌注损伤的神经保护作用,方法采用线栓法制备大鼠大脑中动脉缺血-再灌注模型,将SD大鼠分为再灌注组和依达拉奉组,再灌注组和依达拉奉组按再灌注2，6，12，24，48h分为5个组,依达拉奉组在缺血2h后解除栓塞，给依达拉奉3mg·kg^-1静脉注射，首次给药24h后相同剂量再次给药,再灌注组给予0.9％氯化钠溶液，给药剂量、实践和方法同依达拉奉组,检测各组血清丙二醛（MDA）浓度，免疫组化染色及原住细胞凋亡检测法（TUNEL法）测定脑系组织bcl-2蛋白表达扣凋亡细胞数，并测量各组脑梗死体积,结果依达拉奉组再灌注后6，12，24，48h的梗死体积血清MDA浓度TUNEL阳性细胞数均明显小于再灌注组（P〈0.05），各时间点bcl-2蛋白均高于再灌注组（P〈0.01）,结论依达拉奉可以降低羟自由基水平，对抗细胞凋亡，对脑缺血-灌注损伤大鼠神经有明显保护作用.  相似文献   

磷肥和有机肥的产量效应与土壤积累磷的环境风险评价   总被引：32，自引：0，他引：32  

刘建玲  廖文华  张作新  张海涛  王新军  孟娜 《中国农业科学》2007,40(5):959-965

 【目的】研究大量施用磷肥和有机肥对大白菜产量、土壤各形态磷积累量、土壤磷的吸附饱和度、土壤灌溉水中可溶性磷及土壤磷渗漏的影响。【方法】采用磷肥和有机肥田间定位试验的作物产量效应和土壤积累磷的环境风险相结合的方法。【结果】施用P2O5 360 kg•ha-1和有机肥150 t•ha-1显著增加大白菜的产量，过量施用磷肥和有机肥大白菜产量无显著变化；随着磷肥和有机肥用量的增加, 0～20 cm土层Olsen-P、CaCl2-P、NaOH-P、土壤灌溉滞留水中可溶性磷均显著增加，随着磷肥和有机肥用量的增加，土壤磷的吸附饱和度（DPS）增加，在施用磷肥基础上增施有机肥，土壤最大吸磷量（Qm）明显降低；20～40 cm土层Olsen-P与CaCl2-P显著增加。【结论】过量施用磷肥和有机肥白菜产量无显著变化；随磷肥和有机肥用量的增加，土壤Olsen-P、水溶性磷、生物有效磷、土壤磷的吸附饱和度及土壤灌溉滞留水中可溶性磷含量均显著增加，从而明显增加了土壤积累磷的潜在风险。  相似文献   

冷激处理对芒果贮藏冷害及相关酶的影响   总被引：4，自引：0，他引：4  

赵志磊  顾玉红  赵玉梅  姜微波  侯名语 《河北农业大学学报》2007,30(4):27-30

为探讨减轻芒果冷害的新途径,研究了0℃冷激处理3、45、h对芒果2℃贮藏12 d的冷害症状、贮藏品质及3种同工酶的影响。结果表明:0℃冷激处理3、45、h均显著降低了果实在2℃下贮藏期间的冷害指数和冷害率,0℃处理4 h的冷害指数最低,比对照果低60%,冷害率比对照果低32%,0℃冷激处理4 h促进了芒果贮藏期间可溶性固形物含量的上升,降低了可滴定酸的含量,延缓了抗坏血酸的含量的下降,对硬度的影响不大;同工酶电泳显示:0℃冷激处理4 h提高了芒果贮藏中后期ATP酶、细胞色素氧化酶、过氧化物酶的活性。  相似文献   

壳聚糖涂膜减轻黄瓜冷害的研究   总被引：1，自引：0，他引：1  

袁蒙蒙  高丽朴  王清  杨娜 《湖北农业科学》2012,51(10):2016-2020

试验研究了在3℃环境下、不同浓度的壳聚糖醋酸溶液涂膜处理对黄瓜果实采后贮藏期间冷害的发生、贮藏品质的变化及生理生化指标动态的影响.结果表明,低温下采用壳聚糖涂膜处理可有效地延迟黄瓜冷害出现的时间,并能减轻冷害症状、降低果实采后的呼吸强度、延缓果皮叶绿素的降解、抑制细胞膜透性的上升、减缓果实内丙二醛的积累、使果实内过氧化氢酶和过氧化物酶的活性维持在较高的水平,其中以1.00％浓度的壳聚糖醋酸溶液涂膜处理的改善黄瓜在低温下的贮藏品质效果最佳.  相似文献   

Serum Cardiac Troponin I Concentrations in Dogs with Systemic Inflammatory Response Syndrome          下载免费PDF全文

L. Hamacher  R. Drfelt  M. Müller  G. Wess 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2015,29(1):164-170

  相似文献   

大叶女贞耐寒性研究——基于2009年河北省邢台市大叶女贞冻害调查分析     

刘宝臣  唐伟斌 《安徽农业科学》2012,(13):7783-7784,7831

[目的]研究2009年初冬暴雪对邢台市区栽植的大叶女贞的冻害情况。[方法]采用重点区域普查法对邢台市主城区的主要干道、公园、游园内种植的大叶女贞冻害情况逐一调查并分析。[结果]种植年限、栽植环境和温度骤降是造成冻害的主要原因。[结论]选用耐寒品种和大规格苗,选择适宜栽植环境,提高养护管理水平等可以提高大叶女贞的耐寒性。  相似文献   

S100B protein and neuron-specific enolase as predictors of postoperative cognitive dysfunction in aged dogs: a case-control study     

《Veterinary anaesthesia and analgesia》2020,47(6):740-747

ObjectivePostoperative cognitive dysfunction (POCD) may be related to brain injury. S100B protein and neuron-specific enolase (NSE) have been investigated as potential biochemical markers of neural cell injury in animals and humans. This study aimed to investigate the association between POCD, brain injury and serum concentrations of S100B and NSE after periodontal surgery in aged dogs.Study designProspective observational animal study.AnimalsA total of 24 male and female dogs undergoing periodontal surgery.MethodsDogs were separated into two groups based on age: control group, 10 dogs ≤ 8 years and aged group, 14 dogs > 8 years. Cognitive function was measured preoperatively and on the seventh postoperative day using the Canine Cognitive Dysfunction Rating scale and the Age-Related Cognitive and Affective Disorders scale. S100B protein and NSE serum concentrations were measured before and immediately after the surgery.ResultsPOCD was not observed after surgery in the present study. Serum concentrations of S100B and NSE were increased postoperatively in the control group but not in the aged group (p = 0.04 and 0.03, respectively). Preoperative S100B serum concentrations were significantly higher in the aged group (p = 0.01).ConclusionsThere was no association between POCD and high concentrations of S100B and NSE in dogs. However, increased postoperative serum concentrations of S100B and NSE were found in the control group after surgery, an effect that may indicate neural damage.Clinical relevanceThe results suggest that anesthesia and oral surgery are associated with higher postoperative serum concentrations of S100B and NSE in dogs ≤ 8 years old, which may indicate neural damage. Serum concentrations of S100B were elevated in aged dogs before anesthesia, a finding that might be related to chronic preoperative brain damage.  相似文献   

宁化县横坑切梢小蠹虫害大发生与气候因子分析     

伍小兵 《绿色科技》2012,(7):55-57

以福建省宁化县为例,调查研究了横坑切梢小蠹的生物学特性、危害规律,分析了其与气候因子的关系,并探讨了对横坑切梢小蠹的防治方法。  相似文献   

Expression of neutrophil gelatinase-associated lipocalin in a mouse model of ventilator-induced lung injury     

XIAO Rui  CHEN Rong-chang 《园艺学报》2013,29(10):1753-1757

AIM：To elucidate the effects of mechanical ventilation on the expression of neutrophil gelatinase-associated lipocalin (NGAL) in mice for identifying NGAL as a novel and potential biomarker for ventilator-induced lung injury (VILI). METHODS：Mice were subject to different strategies of mechanical ventilation to establish the mouse model of VILI. The changes of NGAL mRNA level were detected by real-time RT-PCR. At the same time, the protein levels of NGAL in the mouse lung tissues, serum and bronchoalveolar lavage fluid(BALF) were observed by Western blotting analysis. To evaluate the spatial localization of NGAL expression, triple immunohistochemical staining was conduced in the lung tissue samples from the mouse VILI model. RESULTS：NGAL expression was increased in different ventilation groups, and the levels were significantly elevated in VILI groups. The higher level of NGAL expression was observed in the high-peak inflation pressure group and high-volume group. These data implied an important role of NGAL as a sensor in mechanical stimulus and involved in the pathogenesis of VILI. CONCLUSION：NGAL is a potential and novel biomarker for the early prediction of VILI. Monitoring the changes of NGAL in serum and BALF is helpful to diagnose the patients with high risk of VILI.  相似文献