海洋胶体中的氮、磷和铁对微藻生长的效应

利用错流超滤技术提取海洋胶体,研究了无氮、无磷和无铁的营养介质中海洋胶体对海水小球藻、亚心形扁藻和球等鞭金藻生长的影响。结果表明,在胶体有机碳(COC)浓度为0～238.4μmol/L的范围内,3种微藻在以胶体为N源的介质中的平均相对增长率Y分别为20.7％～44.0％,80.1％～110.1％和68.6％～106.2％;在以胶体为P源的介质中的Y值分别为19.3％～43.2％,78.3％～156.7％和77.9％～115.3％。3种微藻的Y值随COC浓度增大呈下降趋势。3种微藻在以胶体为Fe源的介质中的Y值分别为12.7％～35.3％,171.7％～266.3％和400.5％～498.8％,3种微藻的Y值随COC浓度增大呈线性上升。这意味着海洋胶体中存在微藻生长必需的N,P和Fe营养,对微藻的生长有显著的刺激作用。胶体中的Fe营养对球等鞭金藻和亚心形扁藻的效应比N和P营养的约大6～7倍,而胶体中的N和P营养对小球藻的促进作用则约比Fe的大3倍。国家教育部高等学校骨干教师计划基

2018年安溪珠塔内窑调查报告

2018年5月至7月,厦门大学历史系考古专业、福建博物院文物考古研究所及安溪县博物馆等单位联合组成\"安溪古窑址调查队\",对安溪珠塔内窑进行了全面的调查,基本了解珠塔内窑古窑址分布与保存情况,采集了一批明末清初的青花瓷器、白瓷与窑具标本,并发现部分窑炉遗迹,为研究闽南地区青花瓷窑业发展提供了第一手资料

Experimental study on reperfusion of intraocular lens

作者简介: 祁明信, 男, 1945 年7 月 出生, 教授、主任医师、博士研究生 导师, 主要从事白内障的基础与临 床研究。联系电话: 0591-83570887; E-mail:qihuang@netease. com 通讯作者: 黄秀榕,E-mail:[email protected][中文文摘]目的开展晶状体再灌注的离体和动物实验研究,并对再灌注人工晶状体技术进行评价。方法采用新鲜离体幼兔眼、离体猪眼、新西兰白兔眼,应用自行研制的人工晶状体材料,进行以下实验:(1)体外固化实验;(2)晶状体前囊膜微型撕囊及其稳固性实验;(3)经微型前囊膜开口超声乳化吸出晶状体内容物实验;(4)活的新西兰白兔眼内人工晶状体再灌注实验。结果(1)按硅酮聚合物与固化剂50:1的比例可获得柔软、弹性好、固化时间短(完全固化时间为60min)的注入材料;(2)晶状体前囊膜1.8～2.0mm的连续环形撕囊口具有较好的稳定性,可经该微型开口吸出晶状体内容物并灌注材料;(3)超声能量18%、流量25mL·min-1、负压120mmHg(1kPa=7.5mmHg)为晶状体内容物经微型前囊膜开口吸出的最佳条件;(4)注入灌注材料后可形成由晶状体囊膜包裹的、置换原晶状体皮质和核的、新的再灌注人工晶状体。结论采用再灌注人工晶状体的方法可进行新型人工晶状体再灌注,可为治疗白内障和老视提供参考。[英文文摘]Objective To carry out the experimental study on reperfusion of intraocular lens(IOLs) in vitro or in animal,and to assess the technique of IOLs reperfusion.Methods The following experiments were performed by using self-developed materials in fresh rabbit eyes and pig eyes in vitro,as well as in eyes of alive New-Zea-land rabbits:(1)Solidification study of self-developed material in vitro;(2)Continuous circular capsulorhexis(CCC) in anterior capsule of lens and its stability;(3)Draw of lens contents via phaco through mini-CCC;(4)IOLs ref illing in the eyes of alive New-Zea land rabbits. Results(1) Thematerialwhich was soft, springy and short-term solidification(full solidification time was 60 minutes) were obtained in certain proportion of geland solidified agent(50:1) in vitro; ( 2)The CCC in anterior capsule of lens with 1.8-2.0 mm diameter had very good stability. The lens contents were drawn and the materialwere refilled through themini-CCC; (3) The best conditions of drawing out lens contents through m ini-CCC were phaco energy 18% , flow 25 mL·min- 1, and negative pressure 120 mmH g (1kPa=7.5 mmHg);(4) The new refilled IOLs, which were wrapped by capsule of lens and were replaced original cortex and nucleus of lens, were obtained after thematerial refillied. Conc lusion. New IOLs are refilled through this method, which can prov ide reference for the treatment of cataract and presbyopia.福建省科技三项费用;教育厅重点资助项目基金资助(编号:K98041

THE EFFECT OF NATURAL COLLOIDS ON THE GROWTH OF ALGAE

利用错流超滤技术提取天然胶体,研究了胶体的有机碳浓度、粒径和来源对海水小球藻(Chlorellaspp.)、亚心形扁藻(Platymonassubcordiformis)和球等鞭金藻(Isochrysisgalbana)生长的影响。结果表明,当粒径为10kDa—0.2μm、胶体有机碳浓度为4.8—238.4μmol/L时,胶体使小球藻、扁藻和金藻的生长率分别提高了4.0%—7.0%、19.1%—28.9%和2.9%—8.7%。海水小球藻生长率的相对增长百分数(Y)值与胶体有机碳浓度(CCOC)呈线性正相关;亚心形扁藻和球等鞭金藻的Y与CCOC呈多项式相关;胶体对扁藻生长的刺激作用大于球等鞭金藻和海水小球藻。粒径为10kDa—0.2μm的胶体对3种藻的促进作用大于1—10kDa的胶体。河口、河流和生源胶体使小球藻的生长率提高1.5%—14.1%,不同来源的3种胶体对海水小球藻的促进作用依序是河流胶体>生源胶体>河口胶体。以上结果表明,天然胶体含有微藻生长所必需的营养元素,对微藻的生长有显著的刺激作用。Natural colloids are originated from multiple sources from river runoffs, sediment re-suspension, and marine biological processes. Colloids are contained in organic matters in different sizes and concentrations, which would impact phytoplankton growth in different manners. To study the mechanism that would help mariculture and marine pharmaceutical application, we conducted this research on the effect in terms of colloidal organic carbon(COC)concentration on the phytoplankton growth. Water samples were collected from waters near Xiamen(Amoy)of Fujian representing natural river, estuary, and sea water masses, from which natural colloids were abstracted with cross-flow ultrafiltration technique. Phytoplankton samples were algae including Chlorella spp., Platymonas subcordiformis and [WTBX]Isochrysis galbana. Biogenic colloid was isolated from the cultured solution of Chlorella spp.With the cross-flow ultrafiltration technique, the water samples were passed through a 0.2μm pore-size cartridge filter to remove suspended particulate matter, and then ultrafiltrate using a cross-flow ultrafiltration cartridge with a 10kDa or 1kDa hollow-fiber membrane. At the end of ultrafiltration, the colloids in retentate were in sizes of 10kDa? C0.2μm or 1—10kDa.The results showed that the growth rates([WTBX]k)of three algae increased respectively 4.0%—7.0%, 19.1%—28.9% and 2.9%—8.7% at COC concentrations of 4.8—238.4μmol/L and colloidal sizes in 10kDa? C0.2μm. The percentage of relative increase of growth rate([WTBX]Y)for Chlorella spp. was directly related to COC concentration, and the relations between [WTBX]Y and COC concentration for [WTBX]P.subcordiformis and [WTBX]I. galbana were polynomial. The stimulation of marine colloids on [WTBX]P.subcordiformis is greater than [WTBX]I. galbana and the [WTBX]Chlorella spp. Results also showed that the growth rates([WTBX]k)of three algae in the colloids in sizes of 1—10kDa increased respectively by 11.6%, 25.4% and 3.2%, and in the colloids sized in 10kDa? C0.2μm, by 22.5%, 29.5% and 4.5%. The values of [WTBX]k for the three algae in the presence of colloids in sizes of 10kDa? C0.2μm were 1.9, 1.2 and 1.4 times greater than that in sizes of 1—10kDa. This means that bioactivity of high molecular weight marine colloids are higher than those in low molecular weight. The adding of estuarine, riverine and biogenic colloids caused 1.5%, 14.1% and 9.7% enhancement in growth rate of [WTBX]Chlorella spp. respectively. The maximum growth stimulations of Chlorella spp. by the three colloids was riverine colloids, biogenic colloids and estuarine colloids in descending order. It is clear that natural colloids contain nutrients required in growth of phytoplankton, and they can markedly boost the algae growth and be uptaken by algae.国家教育部高等学校骨干教师计划基金资助项目,2005;; 国家自然科学基金重大研究计划重点项目,90411016

第三代移动通信系统的发展分析

文章回顾了移动通信技术从第一代到第二代的演进,对发展第三代移动通信所面临的问题与提交给ITU各种技术标准进行了简单说明,进而重点介绍第三代移动通信标准(ITU-RSPC)、系统结构及基本特征