41条牦牛CDS序列的密码子偏好性分析

密码子简并性特征造成了不同物种密码子使用偏好性不同．在对牦牛功能基因组学研究的基础上，利用EMBOSS中的CUSP程序、SMS2中的Codon Usage程序和软件CodonW对牦牛功能基因的41条CDS序列进行了密码子偏好性的分析，并与人、普通牛、猪等物种进行了比较基因组学研究．结果显示：TTC、TTG、CTC、CTG、ATT、GGA、GGG等27个密码子为牦牛的偏好性密码子．研究结果为以后进一步开展牦牛新基因的发现、功能基因表达调控研究，蛋白质结构和功能的预测以、与其他牛种的比较基因组学研究以及牦牛分子标记育种等工作，提供了理论基础．     

一类次线性Hamilton系统的次调和解

运用极小极大方法得到一类局部强制的次线性Hamilton系统的次调和解的存在性定理.     

用锁定放大器精确测量热敏电阻的温度特性

文章介绍了锁定放大器的功能特性，设计了用其精确测量热敏电阻温度特性的测量电路，并进行了测试、分析，得出了热敏电阻阻值随温度变化的关系曲线。     

基于上下文敏感度的动态图像目标识别

针对机载实时系统获取的图像序列既不满足背景固定又没有目标、背景的高灰度比,而且常规方法处理这些图像存在局限性,提出了基于上下文敏感度的运动图像目标识别算法.首先,对标准Hough变换(HT)算法进行改进,即沿着某一方向做HT,如果线段长度或已识别的目标点数加上剩余线段长度小于阈值,则停止此方向的扫描,这种变换克服了标准HT以图像边界点为扫描边界的缺点.其次,在静态图像识别的基础上,定义了图像识别的置信度,对运动图像前后帧的关系进行了量化,据此实现了对目标的识别.实验结果表明,与标准HT相比,改进的算法不仅具有很强的稳定性和高抗干扰能力,识别准确性高,而且处理速度是标准HT的3～5倍.     

激光皮肤治疗技术研究

利用激光对病损组织进行修复的皮肤整形过程,激光对皮肤的治疗,不仅可治愈各种胎记,也能治疗雀斑、纹身、眼眉色斑及鲜红斑痣等多种皮肤病,可为不同年龄的患者,包括老年人与婴儿作治疗.能够解决色素增生类和血管类皮肤病,改善或恢复先天造成的容貌和外表缺陷.激光对皮肤的治疗技术与传统的疗法相比具有出血少、痛苦小、手术质量高、手术时间短、疤痕少和复发率少等优点,是一种科学、快速、安全有效的美容方法.     

腐植酸与纤维素的复合物对废水中重金属离子络合性能的研究

风化煤中提取的腐植酸类物质对废水中有害重金属离子具有一定的络合作用，但有沉积速度慢，时间长，沉积不易分离等缺点，本文用腐植酸钠与纤维素反应产生的复合物，对水中重金属离子的络合性能进行了研究，发现络合效果比单纯用腐植酸钠效果要好。因而腐植酸纤维素 事物有望成为重金属污水处理剂。     

红豆蔻挥发油化学成分的GC/MS法分析

用水蒸气蒸馏法从红豆蔻中提取挥发油．采用不同类型的毛细管柱进行分析，找出最佳分析条件，用归一化法测定其百分含量，并用气相色谱-质谱法对化学成分进行鉴定．鉴定得到48个成分，占挥发油总成分的84％以上．     

Cryptomelane（KxMn8-xO16）： Natural active octahedral molecular sieve（OMS-2）

The Xiangtan manganese deposit (XTM) used to be considered a supergene oxide manganese ore in South China. We reported a new identification of the naturally outcropping cryptomelane by examining the physical, chemical and structural features of the XTM supergene oxide manganese ore. The MnO2 content was over 90%, K2O more than 3%, and water from 2.2%-3.1% which is similar to one in zeolite. The cell parameters of the cryptomelane were given as a0 = 0.9974 nm, b0 = 0.2863 nm, c0 = 0.9693 nm and β= 91.47°. There was a larger pseduotetragonal tunnel in the natural cryptomelane that was formed by [MnO6] octahedral double chains with aperture of 0.462×0.466 nm2, filled with K cations resulting in some Mn3+ substituting for Mn4+ to balance the negative charges of structure. The finding is important not only for prospecting manganese resources in South China, but also in application of octahedral molecular sieve of natural cryptomelane as that developed in the tetragonal molecular sieve of natural zeolite o     

Preparation of (R)-and (S)-2-Allyl-1,3,2-Dinaphtho(α,β)[d.f]dioxaborepin and Their Reactions with Aldehydes

0　IntroductionEnantiopure 1,1′ bi 2 naphtholspossessingC2 chiralityhaveprovedtobeversatilechiralauxiliariesinanumberofasym metricreactions[1 \|6] .Althoughsomeboroncompoundsofthemhavebeenprepared[7 1 6] ,chemistryoftheirallylboranederivativeshasneverbeenreported .Toexplorepossibilityofapplyingseven memberedcyclicchrialallylboronateesterstoasymmetricsynthesisofchiralβ alkenylalcohols,whichareimportantintermediateinthepreparationofopticallyactivenaturalproducts,werecentlyat temptedtosynthesi…     

Climatic significance of stable carbon isotope in tree rings of Abies spectabibis in southeastern Tibet

The annually cross-dated stable carbon isotope of tree-ring a-cellulose of Abies spectabibis collected from the southeastern Tibetan Plateau is used to examine its rela-tionship with climatic parameters. The residual D13C series in treerings is constructed after removing the effects of age trend and rising CO2. We found a close relationship between D13C in tree rings and the relative humidity of September—November of the previous year measured at the nearby Ny-ingchi Meteorological Station, albeit a strong 搇agged effect? Thus we developed a transfer function to reconstruct the autumn relative humidity for the Nyingchi region, which explained 37.9% of the total variance (p < 0.001). Our results suggest a high frequency and moderate amplitude variance of the relative humidity before 1800, and the variance re-versed afterwards.