棉花异性纤维图像在线分割方法

图像分割是基于机器视觉检测棉花中异性纤维含量的关键技术。棉花图像的背景（棉花纤维）简单,灰度服从正态分布,目标（异性纤维）一般都比背景暗,但是细小且灰度分布方差大。该文有针对性地提出一种背景估计阈值BET（Background Estimation Thresholding）方法对棉花图像进行分割,并选择3类典型棉花图像样本与Otsu方法进行了对比试验。BET方法能得到更好的分割结果,并且算法速度快,100万次分割耗时仅8.46 s。试验结果表明该方法简单有效,速度快,可应用于大批量棉花异性纤维的实时在线     

Effects of Dietary Brown Rice on the Growth Performance,Systemic Oxidative Status,and Splenic Inflammatory Responses of Broiler Chickens under Chronic Heat Stress

The aim of this study was to evaluate the effects of dietary brown rice on the growth performance, systemic oxidative status, and splenic inflammatory responses of broiler chickens under both thermo-neutral and chronic heat stress conditions. Forty 12-day-old male broiler chickens (ROSS 308) were randomly assigned to two groups and fed either a control diet (corn-based) or a brown rice-based diet. After seven days (19 days old), both groups were randomly divided into two sub-groups (n=10), one of which was exposed to heat stress (33°C for 14 days), while the other was maintained at 24°C. Heat exposure reduced the body weight gain and feed intake (p<0.01) of both groups. In terms of oxidative plasma states, heat exposure reduced the glutathione peroxidase activity and increased the ceruloplasmin content, while the 2-thiobarbituric acid reactive substance and reduced glutathione levels were not affected adversely. Heat exposure activated the immune responses, as evidenced by increased plasma immunoglobin levels, and altered splenic immune-related gene expressions including heat shock proteins, toll-like receptor 4, and interleukin-12. Under both thermo-neutral and heat stress conditions, dietary brown rice improved the growth performance, decreased the immunoglobulin levels, and down-regulated the expression of splenic immune-related genes of broilers, although their systemic oxidative status was not affected. Dietary brown rice should be considered as a valuable component of broiler chicken feeds subjected to both thermo-neutral and heat stress conditions. The positive effects of brown rice on bird performance may be associated with the modulation of the immune responses, as reflected by the decreased production of immunoglobulins and altered splenic immune-related gene expression.     

健全我国农业植物新品种保护制度体系的思考

文章通过分析农业植物新品种权申请"三多三少"现象,进一步揭示出我国植物新品种保护制度体系存在的问题,从做好植物新品种保护制度体系的顶层设计、全面从严加强植物新品种保护、强化问题导向和先行先试等方面,提出了构建新时代中国特色植物新品种保护制度体系的对策建议,以推动品种不断创新,实现种业全面振兴.     

中西结合治疗犬细小病毒肠炎1例

犬细小病毒肠炎是犬的一种严重的传染病,主要临床特征是出血性肠炎和心肌炎,世界上所有养犬国家都有此病发生,发病率和死亡率高达40%～100%。一、病犬基本情况德国牧羊犬,2003年9月11日出生,体质中等。2006年2月15日,在散放时发现该犬精神萎靡,喜卧,剧烈呕吐白色粘稠状液体并拉     

Differences in free amino acid composition between testis and ovary of sea urchin <Emphasis Type="Italic">Anthocidaris crassispina</Emphasis> during gonadal development

ABSTRACT:   For the purpose of clarifying the differences of taste components between the testis and ovary of the sea urchin Anthocidaris crassispina , variations in free amino acid composition in gonadal extract during gonadal development were investigated using chemical and histopathological methods. Sea urchins were collected at Iki Island, Nagasaki, Japan between 30 April and 5 June 2003, and maturation stages and the free amino acid compositions were determined. The sweet amino acids threonine (Thr), glycine (Gly), and alanine (Ala), the umami amino acid glutamic acid (Glu), and the bitter amino acids lysine (Lys) and arginine (Arg) were the main constituents accounting for more than 80% of total free amino acids. In the testis and ovary, Gly levels were the highest among them and increased with gonadal development. The other free amino acids consisted mainly of bitter amino acids and either showed no variation or decreased with gonadal development. These variations in free amino acid composition were observed more clearly in the ovary than the testis. These findings indicate the possibility of differences in the flavor of sea urchin gonad by sex and gonadal development stages.     

斑节对虾“红体病”细菌性病原的初步研究

从患“红体病”的斑节对虾中分离到８个菌株,通过致病力试验证实其中两个菌株是引起斑节对虾“红体病”的主要病原,使对虾死亡率分别达到７０％和９０％。根据生化试验,确定这两个菌株分别是嗜水气单胞菌和副溶血弧菌。抗药性实验的结果表明,嗜水气单胞菌菌株对强力霉素较为敏感,副溶血弧菌菌株对氟哌酸、红霉素、青霉素和强力霉素较为敏感。     

碘伏对三种水生动物病毒的杀灭效果

测定了碘伏消毒液对三种感染水生动物的病毒的杀灭作用和一些因素对碘伏消毒液消毒效果的影响。结果显示,含有效碘浓度为５ｍｇ／ｌ的消毒液室温下处理５分钟,可灭活滴度为１０７５ＴＣＩＤ５０／ｍｌ的草鱼呼肠孤病毒和１０７０ＴＣＩＤ５０／ｍｌ的病毒性出血败血症病毒;含有效碘浓度为５０ｍｇ／ｌ的消毒液可灭活滴度为１０５７５ＴＣＩＤ５０／ｍｌ的甲鱼虹彩病毒。细胞培养液中的有机成分对碘伏消毒液中有效碘浓度有较大的影响;酸碱度６～９之间,碘伏消毒液中有效碘浓度没有明显变化。     

Food habits of small fishes in seagrass habitats in Trang,southern Thailand

To clarify the feeding habits of seagrass fishes, we examined the gut contents from 42 fish species collected in seagrass habitats in Trang. Thirteen species showed ontogenetic and/or seasonal changes in food-use patterns. Smaller individuals generally preyed on small planktonic items (e.g., copepod larvae) or small benthic/epiphytic crustaceans (e.g., harpacticoid copepods), with subsequent changes to other prey items (e.g., shrimps, crabs, detritus and filamentous algae) with growth. The most important dietary items for the seagrass fish assemblages comprised benthic/epiphytic crustaceans, detritus, and planktonic copepods. Cluster analysis based on dietary overlaps showed that the seagrass fishes comprised eight feeding guilds (large benthic/epiphytic crustacean, detritus, planktonic animal, small benthic/epiphytic crustacean, mollusc, invertebrate egg, polychaete, and fish feeders). Of these, the first three guilds were the most abundantly represented, whereas the last three were each represented by only a single species.     

栗子坪自然保护区野生动物疫源疫病监测工作现状及发展对策研究

四川栗子坪保护区国家级陆生野生动物疫源疫病监测站是2018年新增的监测站点,为加快监测站职能建设,对监测站疫源疫病监测工作现状及存在问题进行分析,提出成立专门机构、整合现有资源、加强日常巡护的快速建设建议以及完善基础设施建设、开展疫病本底调查、培训监测队伍的长期建设的发展建议,期望对新增疫源疫病监测站的发展和建设提供参...     

台湾进境日本对虾中检出斑节对虾杆状病毒

斑节对虾杆状病毒（Ｐｅｎａｅｕｓｍｏｎｏｄｏｎ－ｔｙｐｅｂａｃｕｌｏｖｉｒｕｓ,ＭＢＶ）能危害斑节对虾（Ｐｅｎａｅｕｓｍｏｎｏｄｏｎ）、万氏对虾（Ｐ．ｖａｎｎａｍｅｉ）、长毛对虾（Ｐ．ｐｅｎｉｃｉｌａｔｕｓ）、短沟对虾（Ｐ．ｓｅｍｉｓｕｌｃａｔｕｓ）...