不同处理方法对辣椒采后贮藏特性的影响

分别采用热处理、1-MCP处理、乙烯处理尖椒.结果显示,各处理均引起了采后辣椒膜损伤,同时热处理和1-MCP处理可以抑制乙烯生成和呼吸高峰,延迟叶绿素降解,起到延长贮藏期的目的.     

Isolation and Characterization of Pepsin-Soluble Collagen from the Skin of Peru Squid (Dosidicus gigas)

Pepsin-soluble collagen (PSC) was isolated from Peru squid (Dosidicus gigas) skin and physicochemical properties of the PSC were determined. The PSC exhibited a maximum absorbance at 220 nm. Sodium dodecyl sulfate polyacrylamide gel electrophoresis suggested the collagen containing α1 and α2 chain was classified as type I collagen. Amino acid composition indicated that the collagen had lower amino acid content than that of mammalian collagen. Denaturation temperature (T_d) of the PSC was 26.8°C. The PSC had relatively high solubility in alkaline condition or NaCl concentrations below 2%. Fourier transform infrared spectroscopy investigations showed the existence of helical arrangements of collagen. The lyophilized collagen had a uniform and regular network structure. These results suggested that Peru squid skin was a potential source of collagen for further research and application.     

木瓜愈伤组织中齐墩果酸的含量测定

利用木瓜芽孢进行愈伤组织的诱导,采用渗漉法对木瓜愈伤组织中的齐墩果酸进行了提取,然后用薄层层析法对齐墩果酸进行了分离,用比色法进行测定.筛选出最适合愈伤组织生长的培养基为,MS+2,4-D2.5 mg·L-1+6-BA 0.5 mg·L-1,木瓜愈伤组织中游离齐墩果酸的含量为0.078%.通过木瓜愈伤组织进行齐墩果酸的...     

An ecosystem-based assessment of the Korean blue crab trammel net fishery in the Yellow Sea and management implications

Landings in the blue crab, Portunus trituberculatus, fishery in Korean waters of the Yellow Sea have declined substantially from 11,000 t in the 1980s to 2,300 t in 2004. Blue crab habitat quality in the Yellow Sea has been degraded by anthropogenic activities including sand mining, land reclamation, and coastal pollution. Various traditional management measures have been implemented, including closed seasons during spawning and size limits, but these measures alone have been unsuccessful to conserve blue crab stocks. Consequently, a total allowable catch and a stock-rebuilding program using an ecosystem-based management approach were implemented in 2003 and 2006, respectively to rebuild blue crab stocks and restore habitats. This program involved assessment of both blue crab stock status and trammel-net fishery impacts at an ecosystem-level using an ecosystem-based fisheries assessment method ( [Zhang et al., 2009] and [Zhang et al., 2010]), which considered fishery data from catch and effort time-series, crab population biology, and ecosystem characteristics, including habitats and environmental conditions. Recent (2008) management status indices have shown significant positive change compared to conditions in 2000 with respect to sustainability of the stock and fishery and with regards to biodiversity and ecosystem habitat quality.     

茵陈蒿汤加味配合西药治疗犬传染性肝炎的试验研究

为了观察3种治疗方法治疗犬传染性肝炎的疗效并进行对比,选出较好的治疗方案,以提高犬传染性肝炎的治愈率。本研究选宠物医院确诊为犬传染性肝炎的病犬60只,将患犬随机分4组,分别采用茵陈篙汤加味配合西药、单用茵陈篙汤加味、单用西药的治疗方法,并设对照组。结果显示,茵陈篙汤加味配合西药组的治愈率86.67%;茵陈篙汤加味组治愈率73.33%;西药组治愈率66.67%;对照组治愈率为0。试验表明,采用茵陈篙汤加味配合西药治疗犬传染性肝炎的疗效高于其他两种方法,为临床治疗该病提供了确实可行的治疗方法。     

高,宝,邵伯湖浮游植物资源调查报告

本文报道了高，宝，邵伯湖游植物资源调查结果。     

Short-term storage and cryopreservation of Urechis unicinctus (Echiura: Urechidae) sperm

In the present study, attempts were made to preserve Urechis unicinctus sperm at 4°C. Cryopreservation procedures were optimized for various cryoprotectants and freezing rates, equilibration times and dilution ratios. During short‐term storage, the motility of undiluted sperm was extended for 6 days of cold storage,and in 70% and 100% artificial seawater only persisted for 2 and 4 days respectively. The survival rate of undiluted sperm was maintained at a high level accordingly. After cryopreservation, the highest motility and survival rate (41.5±2.2%) were obtained in 15% dimethyl sulphoxide (Me₂SO) using a freezing rate of 30°C min^?1. After thawing the sperm cryopreserved in glycerol lost almost all motility. The motility and survival rate of post‐thawing sperm did not show significant differences after 8 and 15 min equilibration using 15% Me₂SO as cryoprotectant; the values were significantly higher than those of 2 min equilibration. Comparisons of motility and survival rate between treatments pooled by dilution ratio showed that the effect of 1:1 ratio (sperm volume to cryoprotectant volume) was best. There was no difference between 1:3 and 1:5, and other ratioswere significantly worse.     

30个香蕉品种遗传多样性的ISSR分析

利用ISSR技术对香蕉30个品种的遗传多态性进行了分析。从60个随机引物中筛选出8个多态性引物,共扩增出54条DNA带,其中44条为多态性带,占81.5%,平均每个引物扩增的DNA带数为6.75条。按照相同迁移位上有扩增带记为1、无带为0的方法构建ISSR表型数据矩阵,用MEGA2.0软件对香蕉30个品种进行UPGMA聚类分析,计算出30个品种间的平均距离系数为0.313,并在此基础上建立了聚类分析树状图,将香蕉30个品种划分为A、B、C、D4大聚类组。     

Apparent digestibility coefficients of selected feed ingredients for juvenile snakehead,Ophiocephalus argus

Apparent digestibility coefficients (ADCs) of dry matter, crude protein, crude lipid, gross energy, phosphorus and amino acids in Peruvian fish meal, poultry by‐product meal, meat and bone meal, spray‐dried blood meal, hydrolysed feather meal, corn gluten meal, soybean meal, peanut meal, cottonseed meal and rapeseed meal were determined for juvenile snakehead (Ophiocephalus argus) with initial mean body weight of 78.1 g. A reference diet and test diets that consisted of a 70 : 30 mixture of the reference diet to test ingredient were used with 5 g kg^?1 Cr₂O₃ as an external indicator. Fish meal, poultry by‐product meal and corn gluten meal had higher ADCs of dry matter, crude protein, and gross energy among ingredients tested. Dry matter ADCs ranged 61.9–81.5% for animal ingredients and corn gluten meal and ranged 52.2–68.0% for soybean meal, peanut meal, cottonseed meal and rapeseed meal. Energy ADCs of ingredients followed similar trends to differences in dry matter digestibility. Protein ADCs of animal and plant ingredients ranged 73.6–92.8% and 75.3–85.6%, respectively. Amino acid ADCs generally reflected protein digestibility. Lipid ADCs were relatively high for the ingredients tested. Phosphorus ADCs of animal and plant ingredients ranged 39.5–65.2% and 38.7–57.1%, respectively.