983 resultados para Dendritische Zelle, Glucocorticoid, IL-10, IL-21, Treg


Relevância:

100.00% 100.00%

Publicador:

Resumo:

采用复合垂直流人工湿地处理武汉东湖污染水的中试结果表明 ,出水中NH+ 4-N、NO- 2 -N和凯氏氮 (KN)浓度均显著降低 ,而NO- 3-N含量有所上升 ;系统最佳运行水力负荷为 80 0mm/d ,超过此负荷后系统净化效果随负荷增加而下降 ;在东湖现有的污染负荷下 ,处理系统仍呈现出继续承载污染量的潜力 ;就基质中KN的分布而言 ,水平方向为下行流池含量高于上行流池 ,垂直方向为上层 >中层 >下层 ,而在植物体内的分布则为叶片中含量最高。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

8种浮选药剂对大型溞的48小时LC_(50)值在2.40—102.30毫克/升之间。它们的毒性顺序为:MPA>2号油>Fu>0145>Yx>S808>甘苄油>10号油。浮选药剂0145对大型溞21天慢性毒性试验结果:NOEC为2毫克/升,LOEC为3毫克/升,其应用因子在0.15—0.22之间。磷矿选矿厂废水毒性甚低。磷矿选矿过程中加入的4种选矿药剂其毒性单位分别为:S808 50.00,亚硫酸化皂26.67,Na_2CO_3 6.66,Na_2SiO_3 0.35。文中提出化学物按溞类48小时LC_(5

Relevância:

100.00% 100.00%

Publicador:

Resumo:

为适应日益激烈的市场竞争压力,企业集群成为当今中小企业发展的重要方向。随着信息技术和计算机网络技术的发展,网络化制造的出现使企业集群的优势更加凸显,两者互相促进,形成良性循环。本文对企业集群及其成因、企业集群的网络化制造机理、企业集群的网络化制造运行模式及实施过程进行了一些探讨。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Background: Flying lemurs or Colugos (order Dermoptera) represent an ancient mammalian lineage that contains only two extant species. Although molecular evidence strongly supports that the orders Dermoptera, Scandentia, Lagomorpha, Rodentia and Primates form a superordinal clade called Supraprimates (or Euarchontoglires), the phylogenetic placement of Dermoptera within Supraprimates remains ambiguous. Results: To search for cytogenetic signatures that could help to clarify the evolutionary affinities within this superordinal group, we have established a genome-wide comparative map between human and the Malayan flying lemur (Galeopterus variegatus) by reciprocal chromosome painting using both human and G. variegatus chromosome-specific probes. The 22 human autosomal paints and the X chromosome paint defined 44 homologous segments in the G. variegatus genome. A putative inversion on GVA 11 was revealed by the hybridization patterns of human chromosome probes 16 and 19. Fifteen associations of human chromosome segments (HSA) were detected in the G. variegatus genome: HSA1/3, 1/10, 2/21, 3/ 21, 4/8, 4/18, 7/15, 7/16, 7/19, 10/16, 12/22 (twice), 14/15, 16/19 (twice). Reverse painting of G. variegatus chromosome-specific paints onto human chromosomes confirmed the above results, and defined the origin of the homologous human chromosomal segments in these associations. In total, G. variegatus paints revealed 49 homologous chromosomal segments in the HSA genome. Conclusion: Comparative analysis of our map with published maps from representative species of other placental orders, including Scandentia, Primates, Lagomorpha and Rodentia, suggests a signature rearrangement (HSA2q/21 association) that links Scandentia and Dermoptera to one sister clade. Our results thus provide new evidence for the hypothesis that Scandentia and Dermoptera have a closer phylogenetic relationship to each other than either of them has to Primates.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

本论文对滇金足草(Goldfussia yunnanensis)、凋缨菊(Camchaya loloana)和长喙吴萸(Evodia vestia)的化学成分进行了研究,通过色谱分离得到40个化合物。主要基于波谱数据鉴定了它们的结构,其中10个为新化合物。 1.从滇金足草地上枝叶的95%乙醇提取物中共分离鉴定了16个化合物:泽漆内酯A(1)、18-羟基泽漆内酯A(2)、18-氧代泽漆内酯A(3)、18-羟基-3-O-β-D-吡喃葡萄糖-泽漆内酯A(4)、3-O-β-D-吡喃葡萄糖-泽漆内酯A(5)、3-O-β-D-吡喃半乳糖-泽漆内酯A(6)、6-E-肉桂酰哈巴俄苷(7)、E-哈巴俄苷(8)、5,6-异亚丙二氧基哈巴俄苷(9)、β-谷甾醇(10)、β-胡萝卜苷(11)、齐墩果酸(12)、肉桂酸(13)、麦角固醇(14)、硬脂酸(15)和丁二酸(16)。其中2-7为新化合物。5,6-异亚丙二氧基哈巴俄苷(9)以人工产物形式得到。 2.从凋缨菊地上枝叶的95%乙醇提取物中分离并鉴定了13个化合物:凋缨菊内酯A~C (17-19)、1β-乙酰基凋缨菊内酯C(20)、b-谷甾醇(10)、β-胡萝卜苷(11)、羽扇豆醇(21)、桦木醇(22)、桦木酸(23)、芥子醇(24)、紫丁香苷(25)、咖啡酸(26)和熊果酸(27)。其中化合物17-20为桉叶烷内酯类新化合物。化合物17、18、20对细胞株HepG2的GI50依次为7.80、7.08、4.99 µg/mL。 3.从长喙吴萸(E. vestia)地上枝叶的95%乙醇提取物中分离并鉴定了13个化合物:佛手内酯(28)、花椒毒素(29)、异茴芹内酯(30)、七叶内酯(31)、东莨宕素(32)、瑞香素(33)、异紫花前胡内酯(34)、茵芋碱(35)、山刈碱(36)、白鲜碱(37)、黄柏酮(38)、柠檬苦素(39)和对羟基苯甲醛(40)。 4.综述了1990—2007年期间从菊科植物中发现的桉叶烷-12,6内酯的化学结构、生物活性、生物转化及化学合成方面的研究进展。 Phytochemical investigation on Goldfussia yunnanensis, Camchaya loloana, and Evodia vestia, led to the isolation of 40 compounds, 10 of which were new ones. 1. Six new compounds were isolation from 95% ethanolic extract of the aerial parts of G. yunnanensis, and identified as 18-hydroxyhelioscopinolide A (2), 18-oxohelioscopinolide A (3), 18-hydroxy-3-O-β-D-glucopyranosylhelioscopinolide A (4), 3-O-β-D-glucopyranosylhelioscopinolide A (5),3-O-β-D-Galactopyranosyl helioscopinolide A (6), 6-O-trans-cinnamoyl E-harpagoside (7). The known compounds isolated were helioscopinolide A (1), E-harpagoside A (8), 5,6-isopropylidene E-harpagoside A (9), β-sitosterol (10), β-daucosterol (11), oleanolic acid (12), cinnamic acid (13), ergosterol (14), stearic acid (15) and succinic acid (16). Compound 9 was an artifact. 2. Four new compounds, loloanolides A – C (17 - 19) and 1β-acetoxy-loloanolide C (20), were isolation from 95% ethanolic extract of the aerial parts of C. loloana. The known ones were β-sitosterol (10), β-daucosterol (11), lupeol (21), betulin (22), betulinic acid (23), sinapyl (24), syringin (25), caffeic acid (26) and ursolic acid (27). The GI50 values of compounds 17, 18 and 20 to HepG2 cell line were 7.80, 7.08 and 4.99 µg/mL, respectively. 3. Thirteen were isolated from 95% ethanolic extract of the aerial parts of E. vestia for the first time. They were determined to be bergapten (28), xanthotoxin (29), isopimpinellin (30), esculetin (31), scopoletin (32), daphnetin (33), marmesin (34), skimmianine (35), confusameline (36), dictamine (37), obacunone (38), limonin (39) and p-hydroxy phenyl aldehyde (40). 4. The structures, biological activities, biotransformation and chemical syntheses of eudesmane-12, 6-olides from the Asteraceae during 1990-2007 were reviewed.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

本文主要研究了泸州老窖古酿酒作坊内外环境空气真菌和空气细菌的群落结构和分布特征。结果如下: 作坊内外环境空气微生物浓度差别显著,并随季节变换而变化,春、夏季微生物浓度较高,秋、冬季较低,空气真菌在夏季达到最高,细菌在春季最高。 古作坊内外环境检测到的真菌均为16 属,但优势菌属不同,作坊外的优势菌属为青霉属(Penicillium)、曲霉属(Aspergillus)、无孢菌(non-sporing)、枝孢霉属(Cladosporium)和链格孢属(Alternaria);而作坊内优势菌属为曲霉属、青霉属、酵母菌(Yeast)、无孢菌,作坊内还含有较高浓度的根霉属(Rhizopus)、毛霉属(Mucor)、短梗霉属(Aureobasidiu),枝孢霉属和链格孢属等,曲霉属、酵母菌、根霉属、毛霉属为古酿酒作坊重要的酿酒真菌,青霉属、链格孢属为酿酒不利菌群。对古作坊内曲霉属进行了初步鉴定,主要是小冠曲霉(A.cristatellus)、米曲霉(A.oryzae)、黑曲霉(A.niger)和白曲霉(A.cadidus)。 空气细菌10 属21 种,作坊内外环境的优势菌属均为芽孢杆菌属(Bacillus)、微球菌属(Micrococcus)、葡萄球菌属(Staphylococcus)、假单胞菌属(Pseudomonad),其中芽孢杆菌属在作坊内占有绝对的优势,浓度比在40℅以上,是古酿酒作坊重要的酿酒细菌,另外还检测到较高浓度的乳酸杆菌(lactobucillus),这类菌容易使酒味发涩发苦,为酿酒不利菌。 作坊内外环境空气微生物表现出明显的交流现象。作坊内,青霉属、枝孢霉属、链格孢属、葡萄球菌属等杂菌占有一定比例;而在作坊外,芽孢杆菌属、曲霉属、根霉属(Rhizopus)、酵母菌等处于相对较高水平,绿化环境较好的营沟头作坊内的短梗霉属,枝孢霉属和链格孢属等杂菌含量低于什字头和新街子作坊。 The community structure and distribution characteristic of airborne microbes was investigated in ancient brewage workshops of luzhoulaojiao. The results are as follows: The concentration of airborne microbes was different in interior and exterior environment of ancient workshops, and also varied by seasons. microbial concentration was higher in spring and summer, and lower in fall and winner. The highest levels of airborne bacteria was in spring, but the fungal’s in summer. The identified genus of fungi were 16 in interior and exterior environment of the ancient workshops. But the dominant genus were different , The advantage genus in the interior were Aspergillus, Yeasts, Penicillum and Nonsporing and in the exterior were Penicillum, Nonsporing, Cladosporium, Aspergillus and Aureobasidiu. Rhizopus ,mucor, Aureobasidiu, Cladosporium, Alternaria and all also were at a higher level. Among these, Aspergillus, Yeasts, Rhizopus ,mucor are important vintage flora . Penicillum, Alternaria do harm to vintage. Aspergillus of ancient workshops was identified , the preponderant aspergillus species were A.cristatellus, A.oryzae, A.niger and A.cadidus in ancient brewage workshops. 10 genus 21 species bacteria were identified, the advantage genuses among the interior and exterior of the three workshops were bacillus, microccus, Staphylococcus Pseudomonas. Bacillus, which account for beyond 40℅ of the total bacteria concentration in all sampling pots, was the most dominant genus. Lactobacillus was identified at a high level in ancient workshops, it makes spirit taste bitter and astringent. So it is not a kind of good bacterium for vintage. The fungus in the interior and exterior atmosphere characterized intercommunion phenomenon. Obviously, the concentration of profitless fungus such as Penicillum, Cladosporium, Alternaria appeared in the interior, and the fungus such as Bacillus, Aspergillus, Rhizopus and Yeasts in the exterior were at a relatively high level. the harmfull fungus in yinggoutou workshops such as Aureobasidiu, Cladosporium, Alternaria and all were lower than shenzitou and xinjiezi workshops.

Relevância:

100.00% 100.00%

Publicador:

Relevância:

100.00% 100.00%

Publicador:

Resumo:

对光活化金丝桃素体外抑制口蹄疫病毒与宿主细胞吸附作用进行实验。体外培养的BHK-21细胞加入金丝桃素,日光灯下光活化1 h后感染FMDV。通过细胞病变观察、MTT法、双抗体捕获抗原法、扫描电子显微镜进行抑制FMDV与宿主细胞吸附、融合研究。结果表明金丝桃素有明显抑制细胞病变的作用。双抗体捕获抗原法检测金丝桃素有效抑制FMDV和BHK-21细胞的吸附、融合,抑制率可达59.72%。扫描电镜观察,金丝桃素组与病毒对照组相比,BHK-21细胞FMDV颗粒明显减少。提示金丝桃素在体外有显著抑制口蹄疫病毒与宿主细胞的吸附、融合作用。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

In terms of the quantitative causal principle, this paper obtains a general variational principle, gives unified expressions of the general, Hamilton, Voss, Holder, Maupertuis-Lagrange variational principles of integral style, the invariant quantities of the general, Voss, Holder, Maupertuis-Lagrange variational principles are given, finally the Noether conservation charges of the general, Voss, Holder, Maupertuis-Lagrange variational principles axe deduced, and the intrinsic relations among the invariant quantities and the Noether conservation charges of all the integral variational principles axe achieved.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

以马铃薯栽培品种甘农薯2号试管苗为试材,研究了在0.4%、0.6%NaCl胁迫下外源激素GA3、6-BA、IAA对试管苗耐盐性的影响。结果表明:3种激素均对马铃薯试管苗受到的盐胁迫具有一定缓解作用,使盐胁迫下的试管苗叶绿素含量提高、脯氨酸和丙二醛含量降低,其中GA3和IAA提高叶绿素含量的效果显著,GA3降低脯氨酸和丙二醛含量的效果比6-BA和IAA明显。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

循环经济是经济效益与环境效益有机结合的一种新的经济发展模式,将经济发展推向循环经济的轨道是保证可持续发展的重要举措。循环经济具有深刻的经济学基础和生态学基础,发展循环经济具有重要的现实意义,它是生态社会最适宜的经济发展模式,世界发达国家已在发展循环经济领域取得了较大成就。本文从循环经济的基础理论入手,阐述了我国发展循环经济的现状、重要意义和所面临的问题,提出我国发展循环经济的对策,并指出循环经济是中国21世纪经济可持续发展模式的必然选择。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

本文生长出了K2Ln(NO3)5.2H2O(Ln=La;Ce;Pr;Nd;Sm)的单晶,并对其进行了晶体结构及差热-热重分析研究.结果表明,K2Ln(NO3)5.2H2O(Ln=La;Ce;Pr;Nd)的晶体属正交晶系,Fdd2空间群.首次生长出KPrN单晶并用直接法解出其晶体结构.解得KPrN的晶胞参数为:a=11.2210(10),b=21.411(3),c=12.208(2),Z=6;R=0.0240.对KLnN加热,则依次出现脱水、熔化、不可逆相变和NO的分解过程(K2Ce(NO3)5·2H2O除外)K2Ln(NO3)5·2H2O(Ln=La;Nd;Sm)的NO分三步分解,K2Ln(NO3)5·2H。O(Ln=Ce;Pr)的NO分两步分解·KNO3和Ln(NO3)3·nH2O的混合物在225℃左右生成K2Ln(NO3)5

Relevância:

100.00% 100.00%

Publicador:

Resumo:

本文研究了16口虾塘的饲料投喂量、水位、盐度、透明度、水温、pH、溶解氧浓度、NH3-N浓度、水色、对虾体长及浮游植物的种类和数量等水体理化因子和生物因子的变化。经过统计分析结果如下: 在养殖前4个月饲料的日平均投喂量基本上呈一个倒“U”型。即随着养殖时间的推移,饲料日平均投喂量逐渐增大,到养殖60 d左右,饲料日平均投喂量达到了最大值,然后进入一个平台期,平台期大约维持30 d左右,随后饲料日平均投喂量逐渐减少。在120 d~130 d饲料日平均投喂量降到最低点后又逐渐回升。 水位平均值变化趋势基本相同,均为前浅后深,即随着养殖时间的推移养殖水位平均值逐渐加深 。 盐度变化趋势基本相同,均为前低后高,即随着养殖时间的推移养殖水体盐度逐渐升高。 透明度的总体变化趋势为:早上透明度比下午大,前期透明度比后期大。 水温基本上是随着养殖时间的推移而逐渐下降。6:30的水温比17:30的水温低。且6:30水温与17:30水温基本上呈平行趋势。 pH变化的总体趋势为:前期较高,随着养殖时间的推移pH逐渐下降,到中期(90d左右)pH降到最低点,尔后又逐渐上升,略呈“V”字形。早上的pH比下午的低。且早上的pH与下午的pH基本上呈平行趋势,间或有较大波动。 6:30时溶解氧浓度的平均值随着养殖时间的推移而逐渐增高。17:30时溶解氧浓度的平均值在整个养殖过程中比较平稳。同时,17:30时溶解氧浓度的平均值高于6:30,养殖前期(前90d)这种趋势更明显。 NH3-N浓度的平均值随着养殖时间的推移而逐渐增高。在养殖后期NH3-N浓度的波动较大。同时,养殖过程中17:30时NH3-N浓度的平均值高于6:30。 6:30时出现9~21号水色,它们出现的比例分别为:9号占0.1%,10号占0.3%,11号占1.1%, 12号0.6%,13号1.5%,14号占3.7%,15号占7.1%,16号占17.5%,17号占22.0%,18号占15.9%,19号占13.7%,20号10.9%,21号占5.8%;17:30时出现11~21号水色,它们出现的比例分别为11号占0.1%, 12号占0.3%,13号占1.2%,14号占4.0%,15号占6.0%,16号占17.8%,17号占24.7%,18号占18.1%,19号占11.8%,20号占9.7%,21号5.7%。 在11种典型水色中共检出浮游植物67种。其中11号水色检出16种,优势种为诺马斜纹藻(占总数47.1%)和菱形海线藻(占总数29.8%)。12号水色共检出16种,优势种为原甲藻(占总数40.85%)和圆筛藻(占总数20.73%)。13号水色共检出16种,优势种为颤藻(占总数45.58%)。14号水色共检出18种,优势种为拟货币直链藻(占总数56.73%)和膝沟藻(占总数12.87%)。15号水色共检出18种,优势种为诺马斜纹藻(占总数64.76%)。16号水色共检出16种,优势种为拟货币直链藻(占总数69.93%)。17号水色共检出14种,优势种为诺马斜纹藻(占总数62.56%)和膝沟藻(占总数15.76%)。18号水色共检出21种,优势种为拟货币直链藻(占总数71.19%)。19号水色共检出18种,优势种为圆筛藻(占总数94.99%)。20号水色共检出18种,优势种为圆筛藻(占总数87.14%)。21号水色共检出15种,优势种为拟货币直链藻(占总数59.80%)和萎软几内亚藻(占总数17.57%)。 相关分析结果表明高位池理化因子中对水色的主要影响因素:17:30PH值、养殖生物量、17:30NH3-N、17:30 透明度、水交换量。 对体长的主要影响因素为 6:30溶解氧、水交换量、17:30水色、饲料投喂量、盐度、17:30透明度、17:30水温、6:30NH3-N。 对对虾本身生物学形状对体重的影响研究表明体长、头胸甲长、胸宽、额剑下缘刺数目对体重的通径系数达到显著水平,它们是直接影响体重的重要指标,其中体长对体重的直接影响(0.428**)最大,是影响体重的最主要因素,其次为头胸甲长(0.290**)和胸宽(0.245**),额剑下缘刺数对体重的直接影响(0.070*)较小;胸高与体重的相关程度很大(0.7923),但它与额剑上缘刺数对体重的直接影响都非常小,主要通过其他性状间接影响活体重,是影响体重的次要因素。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

七功能水下机械手采用至少1个摆动液压缸作为关节驱动。为进行水下作业要求摆动液压缸工作压力为21MPa。为实现其作业压力,对摆动液压缸采用聚四氟乙烯(PTFE)-橡胶组合密封。设定密封件压缩量,对其进行力学分析和弹性流体动力学(EHL)建模,计算出密封压力、油膜厚度等参数。计算结果表明组合密封能够完成21MPa下摆动液压缸的密封。

Relevância:

100.00% 100.00%

Publicador: