一种干膜状深海鱼皮胶原肽面膜及制备方法

本发明公开一种干膜状深海鱼皮胶原肽面膜及其制备方法。该方法以提取的深海鱼皮胶原多肽1~10份结合玫瑰纯露1~3份、海藻糖1~2份、菊糖0.5~1份为功能原料，以羧甲基纤维素钠2~10份、淀粉0.1~1份、保湿剂5~10份为辅助原料，原料中各组分均以重量计，经溶解、混合、搅拌、均质、干燥等工艺制得干膜状深海鱼皮胶原肽面膜。本发明的胶原多肽面膜可以补充肌肤营养、平整细纹、延缓衰老，是一种实用有效的美容护肤化妆品。

大银鱼和小齿日本银鱼线粒体细胞色素b 和16S rRNA基因部分序列分析

　对大银鱼和小齿日本银鱼的线粒体细胞色素b 和16S rRNA 基因片段进行了扩增和序列测定,分析比较了2 种 间的序列差异。大银鱼2 个个体间细胞色素b 基因序列无差异,小齿日本银鱼3 个个体的序列出现了2 种单倍型;大银鱼 同小齿日本银鱼细胞色素b 序列(单倍型SB21) 之间存在86 个碱基差异(差异率21 %) ,变异较大。大银鱼、小齿日本银鱼 的16S rRNA 基因片段种内个体间无序列差异,两种间存在21 个碱基的差异(差异率5 %) ,有1 个碱基的插入/ 缺失。由 此可见,2 种银鱼间线粒体细胞色素b 基因的进化速率较快,约为16S rRNA 基因片段的4 倍。根据细胞色素b 序列数据, 推算出2 种银鱼大概在中新世晚期发生分化。

The study of biological characteristics and determination of population dynamic parameters of sawtooth barracuda (Sphyraena putnamae) in the Persian Gulf (Hormozgun Province waters)

The biological characteristics and population dynamisms of Sphyraena putnamae, were studied in the northern Persian Gulf and Oman Sea restricted to Hormuzgan province waters within 13 months period, from November 2006 up to November 2007. Biometrical and anatomical measurements were carried out, and biological surveys were conducted on 486 specimens. On the other hand, the growth and mortality parameters were estimated by using 3096 samples. These samples were collected from 3 landings, namely Bandar Abbas, Bandar Lengeh and Bandar Jask. The measurements of the minimum and maximum Fork lengths and weights were 11.7 to 8.03 cm and 135.0 to 4140.0 g, respectively. The results indicated that this species, having the Relative Length of Gut, RLG=0.34±0.002, is strongly carnivorous (often fish-eater), proven by the fact that more than 98% of its stomach contents were fish pieces. Examining the changes in the index of stomach emptiness by the percentage of CV = 0.47% indicates that this fish is Moderate feeder. The level of feeding increased in March, before spawning and decreased in June and September, simultaneously with the spawning season. There are 2 peaks of reproduction or spawning seasons during the months of April-May and September, of which the prior is assumed as the main spawning. The sex ratio (M:F) was calculated 0.5:1.0(X2 =2.11), which did not show a significant difference with expected level of 1:1 (P>0.05). The average absolute and relative reproduction rates of Sphyraena putnamae is respectively as follows: 1866827.1±255448.9 and 1097.7±94.3. The highest and the lowest diameter of matured egg are from 200 to 750 μ, and its average diameter is 402.10 ± 0.190 μ. A parameter for Saw-tooth barracuda length measurement, Lm50, based on the Fork-length, was calculated as 54.01 cm. In other words, as far as the fisheries management is concerned, the fish whose lengths are less than 54.01 cm should not be caught. The calculated level of (R2) (correlations of total length & weight), indicated strong correlations between length and weight of this fish, and the obtained formula included W =0.007100 FL 2.9295 and reinforced this assumption. The “K” Index for this fish in 3 above mentioned landings (Jask, Bandar-Abbas and Bandar-Length) were 1.24, 0.37 and 0.46 per year, respectively and the FL index for the same landings were estimated as 129, 110 and 134 cm, respectively. The growth coefficient (MONRO) for the above mentioned regions were calculated as 3.601, 3.647 and 3.917, respectively; and in the surveyed regions there were no significant differences in populations. The Total mortality coefficient (Z) was calculated 0.76, 1.12 and 1.07 per year, the Natural mortality coefficient was 0.46, 0.63 and 0.70, and the Fishing mortality coefficient (rate) (F) was found to be 0.30, 0.49 and 0.37 per year. The value of the exploitation rate (E) is equal to 0.39 per year, indicating that this species is an under-exploited resource, and there is no excessive fishing pressure on the fish supply of this species in the afore-said regions. The highest level of exploitation was found for ‘Bandar Abbas’ fishing region and the lowest level of exploitation is in ‘Bandar Lengeh’ waters.

Effect of surface roughness on rarefied-gas heat transfer in microbearings

In this Letter, the rarefaction and roughness effects on the heat transfer process in gas microbearings are investigated. A heat transfer model is developed by introducing two-variable Weierstrass-Mandelbrot (W-M) function with fractal geometry. The heat transfer problem in the multiscale self-affine rough microbearings at slip flow regime is analyzed and discussed. The results show that rarefaction has more significant effect on heat transfer in rough microbearings with lower fractal dimension. The negative influence of roughness on heat transfer found to be the Nusselt number reduction. The heat transfer performance can be optimized with increasing fractal dimension of the rough surface. © 2012 Elsevier B.V. All rights reserved.

集胞藻PCC6803中ORF sll0260对于维持基本生命活动的必要作用

集胞藻(Synechocystis sp.)6803的未知功能基因中有很多是细胞的基本生命活动所需要的,这些基因插入失活往往会导致细胞死亡,因而得不到分离完全的突变株,难以进行遗传学研究。构建突变株以铜离子调控的启动子PpetE来控制此类未知功能基因的表达则可能获得完全分离。构建PpetE-sll0260突变株并对sll0260必要作用进行研究。在完全分离的突变株中,去除铜离子可关闭sll0260的表达。此时,突变株生长受到严重抑制,色素含量大为降低,类囊体膜结构破坏,光合作用消失,呼吸能力下降。这些结果