三江源退化高寒草原植物种间亲和性和土壤团聚体特征

为研究三江源地区不同退化程度的高寒草原土壤团聚体和种间亲和性特征,以轻度、中度、重度和极度退化草地为研究对象,对土壤特征和群落特征进行测定.结果表明:随着退化程度的加剧,同一土层相同粒径土壤颗粒的分形维数逐渐减小,>0.5mm粒径土壤团聚体占比下降、平均重量直径减小,<0.5mm粒径土壤颗粒的平均重量直径增大,各粒径团...     

林业数据仓库的设计

基于森林资源规划设计调查(简称二类调查)数据建立的林业数据仓库系统是以各类资源数据为对象、集成了多种加工、分析方法的软件系统。本文分析了林业数据仓库的特点,认为复杂性和时间特性是林业数据仓库的主要特点,由此在数据仓库的设计和实施过程中必须充分考虑时间序列和参数相关关系,并图示了林业数据仓库的体系结构以及建立逻辑模型和物理模型的主要方法。     

蔬菜废弃物资源化利用的技术路径与建议

蔬菜废弃物产生量巨大,推动蔬菜废弃物的资源化利用对于实现农业绿色发展具有重要意义。由蔬菜废弃物的特点决定,多数的处理技术集中于肥料化应用。该研究重点分析了当前较为典型的蔬菜废弃物资源化利用的技术路径以及技术推广的可行性,并从技术集成创新、新装备研发、政策支持和社会化服务4个方面提出加快蔬菜废弃物资源化利用的建议。     

清远枢纽二线船闸混凝土通水冷却智能控制

水管通水冷却是大体积混凝土温度控制最常采取的施工温控措施之一,人工操作劳动强度大,成本高.针对船闸结构混凝土温控特点,依据有关规范和借鉴地下水工衬砌混凝土通水冷却智能控制经验,确定了结构混凝土通水冷却智能控制3个参数(通水时间、冷却水温和温降速率),提出了内部温度曲线控制目标和智能控制技术方法,并配套研制了智能化控制设...     

盐碱胁迫下羊草转录因子的转录组分析

以羊草为试材,采用罗氏454二代测序方法,研究了羊草转录因子家族在逆境胁迫条件下来自38个家族的243个转录因子表达差异模式,以期揭示WRKY、C3HL、NAC等转录因子家族差异基因数量,探讨羊草的抗逆分子机制。结果表明:羊草转录组测序片段经de novo拼接共获得104 105条Unigene序列,对照含有97个转录因子基因,盐碱处理组含有213个转录因子,其中67个转录因子为2组共表达。差异基因表达分析揭示羊草主要通过WRKY、C3HL、NAC转录因子家族的差异表达调控盐碱适应性。该研究为耐盐碱型作物培育奠定了基础。     

彩叶矾根幼苗形态生理特性变化及耐阴性综合评价

以"巧克力纱""银色卷轴""教堂窗户""李子布丁""拼图""红宝石""海浪""紫晶""侃侃""红卷毛""天鹅绒""黑暗之星"12个不同矾根品种为试材,采用形态生长指标和生理生化指标测定及方差和隶属函数值的分析方法,研究了弱光环境对不同彩叶矾根品种在贵州耐阴能力强弱的影响,以期为矾根在西南地区园林景观布置提供依据。结果表明:在弱光环境下,"李子布丁""海浪"的幼苗生长前期表现出较强的耐阴特性;这些矾根品种耐阴能力大小依次为"天鹅绒""教堂窗户""李子布丁""银色卷轴""拼图""海浪""巧克力纱""红宝石""紫晶""侃侃""红卷毛""黑暗之星"。     

琼岛杨一年生播种苗生长节律研究

于2019年5月6日到12月25日对海南省琼岛杨Populus qiongdaoensis一年生播种苗的苗高、地径生长量进行定期观测,采用Logistic方程进行生长进程拟合,研究琼岛杨的苗期生长节律。结果表明,琼岛杨苗高和地径生长都呈现"慢—快—慢"的"S"形生长规律,且苗高、地径生长量与Logistic方程的回归相关性达到极显著水平,其相关系数分别达0.994和0.996。苗高生长速生期约119 d,占生长期的39.67%,占苗高年总生长量的63.77%;地径生长速生期约125 d,占生长期的45.42%,占地径年总生长量的66.15%。     

模拟城市SO2污染对晚松生理特性的影响

以2年生晚松盆栽苗为供试材料,从抗大气环境中SO₂污染方面对晚松的抗逆能力进行了定量评价,为晚松的园林应用提供理论依据。研究表明,晚松叶绿素a、b对模拟SO₂污染反应敏感,叶绿素b所受伤害大于叶绿素a,类胡萝卜素较不敏感。过氧化物酶活性的提高有助于减轻膜脂过氧化造成的伤害,从而使其在SO₂污染胁迫较轻(10 mmol/L)时免受伤害。     

Effects of bFGF on brain edema,nerve function injury and autophagy related protein in rats with traumatic brain injury

AIM:To study the effects of basic fibroblast growth factor (bFGF) on brain edema, nerve function damage and autophagy related proteins in rats with head injury. METHODS:The rat model of craniocerebral injury (CI) was constructed. The rats were divided into control group, CI group, and low-, middle-and high-dose bFGF groups (n=10). The CI model was established in CI group, while the rats in control group were not given epidural impact. The rats in low-dose, middle-dose and high-dose bFGF groups were given bFGF at 2, 4 and 6 μg, respectively, by intraperitoneal injection after 30 min. The neurological function in the rats was evaluated by improved neurological function scoring. The rat brain tissues were taken, and the water content was detected. The levels of tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6) and IL-1β in the brain tissue were measured by ELISA. The malondialdehyde (MDA) content was analyzed by thiobarbituric acid method. The activity of superoxide dismutase (SOD) was examined by WST-8 assay. The glutathine peroxidase (GSH-Px) activity was detected by colorimetric method. The protein levels of autophagy related proteins LC3-Ⅱ and beclin-1 in the brain tissues were determined by Western blot. RESULTS:The neurological function score was increased significantly of the rats in CI group. The rat model of craniocerebral injury was successfully constructed. Neurological function scores in the rats in low-dose, middle-dose and high-dose bFGF groups were reduced, the water content of the brain tissue was also reduced (P<0.05). The levels of TNF-α, IL-6 and IL-1 β were decreased in the brain tissues (P<0.05), the content of MDA was declined (P<0.05), the activities of SOD and GSH-Px were increased (P<0.05), the protein levels of LC3-Ⅱ and beclin-1 were decreased, compared with the untreated rats in CI group (P<0.05). CONCLUSION:bFGF improves the nerve function of the rats with craniocerebral injury, reduces the water content of the brain tissue, reduces the expression of autophagic protein LC3-Ⅱ and beclin-1.The mechanism is related to the inhibition of inflammatory reaction and oxidative damage.     

减氮施肥对菠菜生长发育及品质的影响

以菠菜为试材,采用随机区组方法,研究尿素不同施肥处理对菠菜生长发育的影响,以期达到菠菜生产合理施肥的目的 .结果 表明:适量的减氮施肥对菠菜植株生长发育及生理指标影响不显著,但过量的减施会显著影响菠菜的株高和产量.随着施氮量的减少,菠菜的维生素C和可溶性糖含量均显著增加.可溶性蛋白质含量有所下降,品种间菠菜硝酸盐含量下降及草酸含量下降,分别达到显著水平.综合比较,以"夏丽"品种在减氮20％处理下效果最佳.