旱地生态学问题弱解对初值的连续依赖性

随着工业化的发展,人们越来越注重生态环境保护问题.利用能量方法,采用Sobolev不等式研究了旱地生态学问题,得到了旱地生态学问题非负弱解对初值的连续依赖性.     

柳栎高效造林关键技术研究

柳栎树形优美,且抗高温和寒冷气候,是目前国内最具前景的多用途树种。考察了立地类型、栽植方式和苗木地径规格对柳栎造林成活率及苗高、地径生长的影响,结果表明:选择地径2.0 cm裸根苗,通过宽窄行栽植能有效提高柳栎造林成活率,最大造林成活率高达91.86%。在出圃幼苗地径规格相同的情况下,柳栎造林成活率宽窄行栽植行植均匀栽植。栽植方式和出圃苗木地径规格均对造林后柳栎苗高及地径生长产生显著影响。     

中职生对体育课“厌学”的原因及预防措施

文章采用问卷调查、数据统计等方法,对部分中职学生进行研究,找出影响中职学生在体育课学习中"厌学"的原因,采取一些有效的教学措施,来提高她们对体育课学习的积极性和主动性,发展学生的心理机能与自我控制能力,排除情绪障碍。     

湛江市园林水景的水生植物配置现状及分析

通过对湛江市几个滨水绿地的实地调查,详细研究了湛江市主要园林水景中水生植物的主要形态特性及其在园林中的应用,并讨论了其应用现状及存在的不足。     

1～21日龄黄羽肉鸡棉籽粕傅里叶近红外及化学成分净能预测模型研究

本试验在用比较屠宰法实测25个棉籽粕样品净能(NE)值的基础上,旨在研究用傅里叶近红外( NIRS)和化学成分2种方法建立的NE预测模型的可行性,并比较2种预测模型的预测效果.1)棉籽粕NE值的测定采用维持NE (NEm)+沉积NE(NEp)的方法.其中NEm用回归法测定,设自由采食及限饲20％、40％、60％和80％...     

TTC法快速测定白鲜种子生活力

采用2,3,5-氯化三苯基四氮唑(TTC)染色法测定白鲜种子生活力,利用正交试验设计,研究不同的浸种温度、浸种时间、TTC溶液浓度、染色温度和染色时间对白鲜种子染色效果的影响。结果表明,TTC法能够快速测定白鲜种子的生活力,其染色最佳条件为30℃浸种6 h,35℃条件下0.3%TTC溶液避光染色24 h。     

安络小皮伞提取物对运动外伤的镇痛作用

为研究安络小皮伞提取物对运动外伤的镇痛作用,对其所含生物碱、多糖和麦角甾醇类等物质进行了定性检测并进行了小鼠醋酸扭体和小鼠热板镇痛试验。结果表明,安络小皮伞提取物中含有的成分能够消除并缓解小鼠各种神经疼痛,具有抗炎镇痛的功效。     

食用菌企业并购与增强市场竞争力分析

食用菌企业能否通过龙头企业进行并购重组,调整产能过剩,解决产业集中度低,技术水平低和科研创新能力低的问题,从而激发市场的竞争活力,提升食用菌产业的规模结构,提高企业管理效率,迅速实现食用菌产业的转型升级。为此,通过分析食用菌市场的发展现状,龙头企业的运行模式,企业并购的现实因素等方面来总结龙头企业进行并购的积极影响,以期能为食用菌产业的技术进步和规模扩大提出建设性的意见,促进食用菌产业的高质量发展。     

中早熟西瓜新品种科丰16号的选育

科丰16号是以自交系A45为母本,以自交系花大板为父本育成的西瓜一代杂种。中早熟,全生育期95 d左右,果实发育期30 d左右,主蔓第7~8节着生第1雌花,以后每5~7节现1雌花;植株长势强,坐瓜整齐,果实圆形,果皮绿色覆墨绿色条带,外形美观;瓤肉红色,口感好,瓤质沙脆,中心可溶性固形物含量12%左右;单瓜质量7 kg左右,667 m~2产量4 500 kg左右;抗病性强、适应性广,适宜陕西及相同生态区早春保护地及露地栽培。     

Effect of eleutheroside B/E on proliferation and expression of PPARγ and TGF-β1 in HBZY-1 cells cultured with high glucose

AIM: To explore the effects and mechanism of eleutheroside (ETS) B or E on the proliferation of HBZY-1 cells treated with high glucose. METHODS: The HBZY-1 cells were cultured under high glucose condition. The 4th generation of HBZY-1 cells was used for determining the optimal cell density, which was consistent with the growth regulation curve of the cells. The cells were divided into 6 groups: low glucose (LG) group, high glucose (HG) group, high glucose plus ETS-B/E (low dose, medium dose and high dose) groups, and high glucose plus losartan (LTG) group. After all cells were treated with the corresponding drugs at 24 h, 48 h and 72 h, the inhibitory rate of the proliferation was measured, and the expression of TGF-β1 and PPARγ was detected by immunocytochemistry and Western blotting. RESULTS: The best cell density was 2 000 cells/well, which was complied with the basic rules of the cell growth, and high glucose significantly promoted the HBZY-1 cell proliferation. At each time point, the inhibitory effects of ETS-B/E were significantly different between HG group and LTG group on the proliferation of the HBZY-1 cells (P<0.05). The expression of TGF-β1 was significantly inhibited, and the expression of PPARγ was significantly promoted by ETS-B/E (P<0.05). ETS-E showed stronger effect than ETS-B (P<0.05) in a concentration- and time-dependent manner. CONCLUSION: ETS-B/E significantly inhibits the proliferation of HBZY-1 cells under high glucose condition by decreasing TGF-β1 expression and promoting PPARγ expression.