Study on Application of Hydrodynamic Shocker in Hydraulic Digging Machine

Some schemes that are used to improve the digging machine are introduced in this paper.The merits and faults and the feasibility of these schemes are compared.The scheme with three hydrodynamic shockers and three steel beams to improve the digging machine is discussed.This scheme can solve the problems that probably occur in the digging process.An example is introduced to explain how to determine the parameter of the hydrodynamic shocker.In this paper a new and effective scheme to improve the digging machine is presented.     

Effects of type III hysterectomy on lower urinary tract function

AIM: To analyze the urodynamic data and assess the alterations of lower urinary tract function in the patients before and after radical hysterectomy (type III). METHODS: The patients who underwent type III hysterectomy without complications and other diseases were enrolled in the study. Urodynamic examination was performed in the patients before operation and 12~14 d after surgery. The examination was carried out again 3 months post-operation. RESULTS: Post-void residual (PVR), flow time (FT), first desire to void volume (FDV) and maximum vesical pressure (Pvesmax) were increased in the patients 12~14 d after operation. Maximum flow rate (Qmax), average flow rate (Qave), voided volume (VV), maximum cystometric capacity (MCC), bladder compliance (BC), detrusor pressure (Pdet), maximum urethral pressure (MUP) and maximum urethral closure pressure (MUCP) were significantly decreased compared with preoperative data (P<0.05). PVR, FT, FDV and Pvesmax in 3 months post-hysterectomy were increased, and Qmax, Pdet, BC, MUP and MUCP were decreased compared with preoperative data (P<0.05). Qmax, Qave, VV, MCC, BC and Pdet in 3 months post-hysterectomy increased significantly, while PVR and Pvesmax were decreased compared with the data 12~14 d after operation (P<0.05). CONCLUSION: Most of the patients with type III hysterectomy show severe lower urinary tract dysfunction 12~14 d after operation, such as bladder storage dysfunction due to sharply decrease in bladder compliance, voiding function decline caused by deletion of detrusor contractility, and low urinary continence caused by decrease in urethral closure pressure. The bladder storage and voiding function can partially recover in 3 months.     

Bone marrow-derived mesenchymal stem cells regulate the function of Th17/ Treg in peripheral blood of severe asthmatic children

AIM：To investigate the regulatory function of bone marrow-derived mesenchymal stem cells (MSCs) on T helper 17 cells (Th17) and regulatory T cells (Treg) in peripheral blood of severe asthmatic children. METHODS：MSCs were isolated, cultured and identified in vitro. MSCs digested with mitomycin were cocultured with T lymphocytes (TLC) at different ratios (1∶1, 1∶2, 1∶10 and 1∶20) from severe asthmatic children for 72 h. The proliferation of TLC was measured by CCK-8 method. In the coculture system of the 1∶2 ratio and the single TLC system, the supernatant levels of interleukin-17 (IL-17) and transforming growth factor-β (TGF-β) were measured by ELISA. The mRNA expression of retinoic acid-related orphan nuclear receptor C (RORC) and forkhead box protein 3 (Foxp3) in TLC was detected by qRT-PCR. RESULTS：After cocultured with MSCs, the proliferation of TLC decreased significantly in a dose-dependent manner (P<0.05). It also showed decreases in IL-17 (3 799±441 vs 4 890 ±373, P<0.05) and RORC mRNA level (1.21±0.14 vs 3.85±0.48, P<0.05), while an increase in TGF-β level (209±32 vs 117±26, P<0.05) was observed. No influence on the mRNA expression of Foxp3 was found (P>0.05). CONCLUSION：MSCs suppresses Th17 polarization of naive peripheral blood CD4+ T cells and matures Th17 cells secreting IL-17, which may effectively revise Th17/Treg imbalance of asthma.     

中草药泰山磐石散加减方对小鼠肠道微生物菌群的影响

为了解中草药泰山磐石散加减方对小鼠肠道微生物菌群的影响,本试验选取45只SPF级昆明小鼠,分为对照A组、试验B组和试验C组。试验B组和C组小鼠分别用0.86 g/mL的中草药泰山磐石散方灌胃0.3和0.4 mL,对照A组灌胃蒸馏水0.4 mL,每天灌胃2次,间隔8 h,连续7 d。第8天采集对照组和试验组小鼠直肠部位粪便样品,从每份样品中提取微生物基因组总DNA,采用Illumina HiSeq测序技术检测样品微生物群落多样性。结果显示,中草药泰山磐石散对小鼠粪便中微生物α多样性指数（Chao1和Shannon）呈波动性变化,试验B和C组与对照A组的Chao1指数差异极显著（P<0.01）;通过检测小鼠对照组与试验组粪便中的微生物,在门水平上,有9大优势菌门,其中与对照A组相比,试验组肠道微生物Proteobacteria、Verrucomicrobia丰度显著降低（P<0.05）;而Saccharibacteria、Tenericutes丰度显著或极显著增加（P<0.05;P<0.01）;在科水平上,有19大优势菌科,其中与对照组相比,试验组肠道微生物Lactobacillaceae、Desulfovibrionaceae、Coriobacteriaceae、Porphyromonadaceae、Family_XIII和Bifidobacteriaceae丰度显著降低（P<0.05）;在属水平上,有18大优势菌属,其中与对照A组相比,试验B、C组肠道微生物Lactobacillus、Desulfovibrio和Enterorhabdus丰度显著降低（P<0.05）,而试验C组的肠道微生物Alloprevotella、Bacteroides、Lachnospiraceae_UCG-006和Faecalibaculum丰度显著增加（P<0.05）。本试验中草药泰山磐石散加减方能够有选择性的促进小鼠肠道内Bacteroidetes的生长,从而抑制Proteobacteria有害菌的生长,增强糖和脂肪代谢,最终通过改善肠道微生物多样性的结构,使整个肠道微生物多样性达到一个新的平衡。     

基于PQDT文摘库的渔业学位论文检索策略研究与初步分析

通过分类号检索、主题检索、分类主题结合检索、机构检索等方式,分别拟定了针对PQDT文摘库中人文和社会科学专辑与科学和工程学专辑的两个综合检索式,形成了基于PQDT文摘库渔业学位论文的检索策略,经检验,检准率和检全率较高。基于检索结果,从年度分布、主题、国家/地区、机构与语种等方面初步分析了PQDT文摘库收录渔业学位论文的基本情况。相关分析结果为了解渔业学科英文学位论文的收录概况提供了参考数据。     

浅谈广州大学城绿化四标工程建设的成本控制

介绍广州大学城园林绿化工程绿化四标工程建设成本控制的相关原则,分析了其在成本控制过程中的得与失,并且对于存在问题提出相应的解决措施。     

连香树嫩枝扦插繁殖技术研究

以连香树(Cercidiphyllum japonicum)当年生枝条为材料,研究了不同植物生长调节剂、不同IBA浓度及其处理时间对插穗生根的影响。结果表明:连香树属于皮部生根型,只有极少数为愈伤组织生根。植物生长调节剂处理是提高嫩枝插穗生根能力的一个必要措施,其中IBA对连香树插条生根效果最好,NAA次之,IAA最差。采用IBA 100 mg.L-1+NAA 100mg.L-1混合处理嫩枝插条效果最好,生根率达到81.67%,且幼苗长势良好。IBA 500 mg.L-1快蘸处理8 s,生根率达到71.67%;IBA 200 mg.L-1浸泡6 h,生根率为77.78%。综合各项生根指标,采用IBA 100 mg.L-1+NAA 100 mg.L-1浸泡嫩枝插条4 h,最适宜连香树插条生根。     

伞滑刃线虫交合刺形态图像的规范化和定位算法

应用数字图像处理与分析技术中的最小外接矩形算法和镜像变换算法,用Visual c 作为开发工具,通过编程实现计算机对伞滑刃属线虫交合刺形态图像鉴定规范化和定位的智能化。输入伞滑刃属66个有效种的交合刺形态图像运行程序,均获得正确的定位结果。     

植物响应低硫胁迫的分子生物学机制研究进展

[目的]硫是植物生长发育所必需的营养元素之一.硫不仅参与半胱氨酸和蛋白质等初生代谢产物的合成,还参与硫代葡萄糖苷、植保素、植物螯合肽、维生素、辅酶A等次生代谢物质的合成.因此,适量的硫供给可促进植物生长发育,提高作物的产量和品质,增强植物耐受生物和非生物胁迫的能力.[主要进展]植物主要通过根系从土壤吸收硫酸盐,硫酸盐在...     

塔里木公路防护林生态工程营建与维护

塔里木公路防护林生态工程建设是在沙漠腹地生物防沙试验研究的基础上,依据公路沿线自然条件和立地条件,选择和确定防护林生态工程营建的植物种、林地结构布局以及灌溉方式。塔里木公路防护林生态工程全长436km,林带宽度72～78m,林带面积3128hm~2；植物种选用抗逆性极强的柽柳、沙拐枣、梭梭、胡杨、沙枣等灌木及乔木；树种配置采用行间混交,林带结构选用株行距为1m×2m或1m×1m；整体布局包括阻沙带和固沙带；灌溉方式为滴灌；水源为公路沿线的高矿化度地下水。初步观测表明,防护林工程防护效益和环境改善作用明显,防护林灌溉取水没有对地下水环境形成负面影响。