Emission Mechanism of High Al-content AlGaN Multiple Quantum Wells

紫外LED的发光功率和效率还远不能令人们满意,波长短于300 nm的深紫外LED的发光效率普遍较低。厘清高Al组分Al Ga N多量子阱结构的发光机制将有利于探索改善深紫外LED的发光效率的新途径、新方法。为此,本文通过金属有机气相外延技术外延生长了表面平整、界面清晰可辨且陡峭的高Al组分AlGa N多量子阱结构材料,并对其进行变温光致发光谱测试,结合数值计算,深入探讨了Al Ga N量子阱的发光机制。研究表明,量子阱中具有很强的局域化效应,其发光和局域激子的跳跃息息相关,而发光的猝灭则与局域激子的解局域以及位错引起的非辐射复合有关。The quantum efficiency of deep UV light emitting diodes( LED) drops dramatically with the increasing of Al content. Understanding the emission mechanism of high Al-content Al Ga N multiple quantum wells( MQW) is the one of the most important objects for improving the quantum efficiency of deep UV LED. In this work,high Al-content Al Ga N MQW structure with atomically flat hetero-interfaces was grown and characterized by photoluminescence( PL) measurements at different temperatures. The results indicate that there is a strong exciton-localization effect in the MQW structure and the emission is closely related to the hopping of the excitons. Due to the exciton delocalization and nonradiative recombination at defects,the PL intensity is strongly quenched at high temperatures.“973”国家重点基础研究发展计划(2012CB619300);; “863”国家高技术研究发展计划(2014AA032608);; 国家自然科学基金(U1405253;61227009;11204254;11404271);; 福建省自然科学基金(2015J01028)资助项

一种含有鲫鱼IFN干扰素的蓝藻工程菌及应用

本发明公开了一种含有鲫鱼IFN干扰素的蓝藻工程菌及应用，通过将鲫鱼IFN基因转入蓝藻，获了一种可表达鲫鱼干扰素的转基因蓝藻。将该转基因蓝藻作为饲料添加剂加入鱼饲料中，减少了干扰素在投喂过程中以及消化道中的损耗，实现了使用投喂的方式即能达到提高免疫保护效果的目的，同时这种方法比注射免疫更为便利，适用于鱼类养殖业。因此，将转基因蓝藻作为饲料添加剂添加到鱼饲料中，通过其中的干扰素来提高动物体的免疫机能，从而提高其抗病能力，为开发安全的免疫增强型饲料提供一种解决方案。</p

Species composition in genus Scylla from the coast of southeast China

【中文摘要】 为调查青蟹属在中国大陆东南沿海的种类组成及明确优势种的种类,采集了13个地区共413只青蟹。通过形态比较,确认有4个种,它们是:锯缘青蟹(Scylla serrata),紫螯青蟹(Scylla tranquebarica),拟穴青蟹(Scylla paramamosain),榄绿青蟹(Scylla olivacea)。这4个种类可以从头胸甲额缘4齿的长度(FMSH/DFMS)、形状,螯足腕节内刺的有无、螯足及步足斑纹来区分。其中拟穴青蟹在中国大陆东南沿海分布最广,数量最多,其他3个种仅在海南和北部湾被发现。在拟穴青蟹中有9.7%的成熟个体和33.3%未成熟个体具有螯足内刺,因此不能仅凭借这个特征来鉴别拟穴青蟹。本文对青蟹属4个种的特征进行了描述并编制分种检索表。 【英文摘要】 There has been argument on dominant species and the species composition in the coast of southeast China in genus Scylla.413 individuals were collected from 13 sites and took 24 measurements with vernier calipers to the nearest 0.1 mm.By morphological comparison,there are 4 species being classified,namely Scylla serrata,Scylla tranquebarica,Scylla paramamosain,Scylla olivacea.The four species can be distinguished from the length and shape of the four frontal spines,with or without inner carpus spine and the ...福建省重中之重项目“福建省海洋生物优良种质和生物活性物质的应用基础研究”; 国家自然科学基金项目(40376044

EFFECTS OF SALINITY ON SURVIVAL AND DEVELOPMENT OF THE MUD CRAB SCYLLA SERRATA

【摘要】 盐度对锯缘青蟹幼体存活与生长发育的影响ＥＦＦＥＣＴＳＯＦＳＡＬＩＮＩＴＹＯＮＳＵＲＶＩＶＡＬＡＮＤＤＥＶＥＬＯＰＭＥＮＴＯＦＴＨＥＭＵＤＣＲＡＢＳＣＹＬＬＡＳＥＲＲＡＴＡ王桂忠林淑君（厦门大学海洋系，３６１００５）ＷＡＮＧＧｕｉＺｈｏｎｇ，ＬＩＮＳ..

A review of nutrient requirements and diets of groupers

主要综述了石斑鱼的营养需求及其饲料的研制。主要内容包括 :(1)石斑鱼对饲料中蛋白质、脂类、碳水化合物、维生素等的营养需求。 (2 )石斑鱼饲料的研制概况。 (3)针对石斑鱼营养学研究以及目前我国石斑鱼养殖还是以小杂鱼为主 ,配合饲料使用率很低的现状 ,对今后开展石斑鱼营养与饲料研究提出了若干建议。 【英文摘要】 This is a review of studies on the nutrient requirements and diets of groupers. It includes the following parts: (1) Nutrient requirements of protein, lipid, carbohydrate and Vitamins for groupers. (2) General situations in the development on formulated diets for grouper. (3) Several suggestions to the further studies on nutrient requirements and formulated diets for grouper according to the recent situation in China that the breeding groupers are fed by trash fish and the use of formulated diet is much li...福建省重大科技项目”海水养殖鱼类抗菌肽基因克隆与高效表达及绿色饲料的研发”部分资

无公害渔用饲料的研究开发

无公害渔用饲料是指以提供水产动物营养为目的 ,能促进动物生长、增强免疫力 ,无农药残留 ,无抗生素残留 ,有毒有害物质含量控制在安全允许范围内 ,无致病微生物 ,霉菌毒素不超过标准 ,不污染环境 ,不影响人体健康。其技术指标符合有关质量标准 ,并经有关部门认定的一类饲料。概述了无公害渔用饲料研究开发的要点 ,主要内容包括 (1 )饲料原料与饲料添加剂的要求 ;(2 )无公害渔用饲料营养质量方面的要求 ;(3)无公害渔用饲料加工质量方面的要求 ;(4 )无公害渔用饲料投喂技术方面的要求。最后 ,分析了该领域目前存在的问题并讨论了今后的研究方

Genetic diversity of two wild populations of Penaeus semisulcatus revealed by RAPD technique

【中文摘要】 利用RAPD标记技术检测了厦门和汕头沿海2个短沟对虾群体基因组DNA的多态性,并对其遗传多样性进行了分析。从40条随机引物中筛选出13个10bp引物,共扩增出65条清晰可重复的DNA片段,片断长度为100~2200 bp,在2个群体间没有检测到特异的片段。厦门和汕头群体的多态片段比例分别为87.69%和89.23%,杂合度分别为0.212和0.218,遗传多样性指数分别为0.2847和0.2913,两群体间的遗传距离为0.018,FST值为0.004。可见两野生群体种质资源仍然维持在良好水平,遗传分化程度很低,可能是同一种群,具有进一步开发的潜力。 【英文摘要】 The green tiger prawn,Penaeus semisulcatus is one of the biggest penaeid prawns and widely distributed in tropical and subtropical regions of the Indian Ocean and the West Pacific Ocean.The important economic shrimp species in the north of the South China Sea are Penaeus semisulcatus,Penaeus monodon,Marsupenaeus japonicus and Fenneropenaeus penicillatus.Although the disease-resistance of Penaeus semisulcatus is more effective than that of Penaeus monodon,Litopenaeus vannamei and Fenneropenaeus chinensis,the...国家自然科学基金资助项目(30471322

A review of nutrient requirements and diets of groupers

主要综述了石斑鱼的营养需求及其饲料的研制。主要内容包括 :(1)石斑鱼对饲料中蛋白质、脂类、碳水化合物、维生素等的营养需求。 (2 )石斑鱼饲料的研制概况。 (3)针对石斑鱼营养学研究以及目前我国石斑鱼养殖还是以小杂鱼为主 ,配合饲料使用率很低的现状 ,对今后开展石斑鱼营养与饲料研究提出了若干建议。This is a review of studies on the nutrient requirements and diets of groupers. It includes the following parts: (1) Nutrient requirements of protein, lipid, carbohydrate and Vitamins for groupers. (2) General situations in the development on formulated diets for grouper. (3) Several suggestions to the further studies on nutrient requirements and formulated diets for grouper according to the recent situation in China that the breeding groupers are fed by trash fish and the use of formulated diet is much limited.福建省重大科技项目”海水养殖鱼类抗菌肽基因克隆与高效表达及绿色饲料的研发”部分资

Holocrine activity of androgenic gland in mud crab Scylla serrata

采用透射电镜技术,对锯缘青蟹(Scyllaserrata)促雄腺细胞的分泌活动进行了观察。结果表明,腺细胞具有2种类型:A型细胞核内常染色质丰富,具有大量的扁平嵴的线粒体、粗面内质网与核糖体,A型细胞进行分泌时,细胞质大量排出,属于全浆分泌方式;B型细胞异染色质绕核内膜分布,仅见极少量的细胞器或细胞质完全消失。B型细胞为A型细胞完成分泌后的存在形式。本研究为甲壳动物促雄腺的全浆分泌活动提供了直接的证据。 【英文摘要】 The secretive activity of androgenic glands in TBScylla serrata was studied using transmission microscope. The results show that there are two types of glandular cells: Type A, which has nucleus rich in euchromatin, and large numbers of mitochondria with flat cristae, rough endoplasmic reticulum and ribosome; Type B, which has nucleus rich in heterochromatin, and the organelles almost vanished. After Type A cell performed the secretion function, it exists as the form of Type B cell. This paper provides the...福建省重中之重项目资助(1998～2002年);; 高等学校博士学科点专项科研基金项目资助(20010384010)

Holocrine activity of androgenic gland in mud crab Scylla serrata

【中文摘要】 采用透射电镜技术,对锯缘青蟹(Scyllaserrata)促雄腺细胞的分泌活动进行了观察。结果表明,腺细胞具有2种类型:A型细胞核内常染色质丰富,具有大量的扁平嵴的线粒体、粗面内质网与核糖体,A型细胞进行分泌时,细胞质大量排出,属于全浆分泌方式;B型细胞异染色质绕核内膜分布,仅见极少量的细胞器或细胞质完全消失。B型细胞为A型细胞完成分泌后的存在形式。本研究为甲壳动物促雄腺的全浆分泌活动提供了直接的证据。 【英文摘要】 The secretive activity of androgenic glands in TBScylla serrata was studied using transmission microscope. The results show that there are two types of glandular cells: Type A, which has nucleus rich in euchromatin, and large numbers of mitochondria with flat cristae, rough endoplasmic reticulum and ribosome; Type B, which has nucleus rich in heterochromatin, and the organelles almost vanished. After Type A cell performed the secretion function, it exists as the form of Type B cell. This paper provides the...福建省重中之重项目资助(1998～2002年);高等学校博士学科点专项科研基金项目资助(20010384010)