Anatomy and histology of the reprodustive system of Cymatium pileare

毛嵌线螺为雌雄异体。其雄性生殖系统包括精巢、贮精囊、输精管、前列腺、导精沟和阴茎 ;雌性生殖系统包括卵巢、输卵管、蛋白腺、受精囊、卵囊腺、交合囊和外生殖孔。前列腺、导精沟和阴茎中的精子输送通道均为开放型的管道。毛嵌线螺的精子包括具有“9+ 2”微管结构的头部和尾部。雄性个体右触角后的阴茎是从形态上区分雌雄个体的主要标志Cymatium pileare is gonochorism. Its male genital system comststs of testis, vesicula seminalis, vasdeferens prostate gland seminal groove and penis and its female genital system consists of ovary, oviduct,albumin gland, receptaculum seminis, capsule gland bursa copulatrix and vestibule. The sperm delivery ducts in prostate gland, seminal groove and penis are open, and the sperm comprises head and tail with central structure of "9+2" axoneme. The penis behnd the right tentacle of the male is the main morphological feature to be distinguished form the female.湖南省农业百项资助项目! (NB0 0 1

旋转玻碳电极上二茂铁的电化学阻抗行为及其与DNA的相互作用

应用旋转圆盘电极和电化学阻抗法研究了二茂铁在Tris-NaC l(pH=7.2)缓冲溶液中于旋转玻碳电极上的电化学阻抗行为及其与DNA的相互作用.结果表明,二茂铁于旋转电极的伏安曲线呈现明显的极限电流平阶,而其交流阻抗谱则出现两个电容弧.二茂铁与DNA的作用,若受扩散过程控制则其极限扩散电流随DNA浓度增大而减小,而在电化学控制过程中则表现为电化学反应电阻随DNA浓度增大而增大.根据旋转圆盘电极和电化学阻抗谱测试,表明由这两种方法数据拟合求得的二茂铁条件电位速率常数能够很好地相互吻合,但如存在DNA时,则其条件电位速率常数有一定程度的减小

若干有机酸化合物光解生成OH自由基的动力学研究

羟基自由基(OH)是地球大气中最重要的化学清洁剂之一，它具有非常强的氧化性，几乎能够消除大气层中所有的气相污染物；同时它对臭氧层的破坏、光化学烟雾的产生、酸雨的形成等起着至关重要的作用。因此，对OH 自由基的物理、化学性质以及来源的研究具有很重要的实际意义。本文中，我们用单光子激光诱导荧光方法(LIF)研究了苯磺酸以及三种苯甲酸衍生物光解生成OH 产物的动力学，主要结论如下： ⒈ 确认了苯磺酸、对氨基苯甲酸266nm 光解生成OH 产物的解离通道。测量了初生态产物OH 的内能态分布。结合实验结果与理论计算，分别讨论了这两个分子光解生成OH 产物的可能的解离机理。 ⒉ 研究了邻硝基苯甲酸295 和355nm 的光解动力学。结果发现：在295 和355nm条件下生成的OH 自由基的振动态布居都是“冷”的，但其转动态布居却不相同。通过理论计算，我们考察了母分子光解产生OH 自由基的可能的几种解离通道。结合实验研究和理论计算结果，提出了邻硝基苯甲酸在295 和355nm 光解条件下产生OH 自由基最 可能的解离机理。 ⒊ 考察了酚羟基基团对邻羟基苯甲酸266 和315-317nm 光解动力学的影响。通过多个波长的光解离，发现产物OH 的Q1(4.5)转动线信号在317nm 条件下可以观测到，而在317.5nm 就观测不到。因此确定了邻羟基苯甲酸光解生成OH 自由基的阈值约为99.1kcal/mol。重点讨论了酚羟基基团对邻羟基苯甲酸光解过程的影响

THE EFFECT OF ULTRASOUND ON THE EXTERNAL ABSORBABILITY OF Epinepheius awoara

应用超声波对8～20cm青石斑鱼体表吸收能力的影响研究表明 ,超声波的超声强度和作用时间以及所浸泡的氯霉素溶液的浓度都对青石斑鱼体表吸收氯霉素的能力有显著影响 ,且呈正相关关系。此外 ,不同的超声作用方法也能显著影响实验石斑鱼的体表吸收能力 ,其中 ,超声后浸泡比浸泡后超声以及脉冲超声比连续超声均能更显著地提高石斑鱼的体表吸收能力。s The study on the effect of ultrasound on the external absorbability of Epinepheius awoara shows that all the intensity and ultrasonic time of the ultrasound and the concentration of the immersed chloromycetin solution have the positive effect. Besides, the ultrasonic methods also have distinct effects on the external absorbability of E. awoara. Compared with the methods‘ultrasound after immerse’ and ‘continuous ultrasound’, the methods ‘immerse after ultrasound’ and ‘pulse ultrasound’ have the better effect on improving the external absorbability of E. awoara.国家863计划海洋领域青年基金!资助项目819 Q 11

ISOLATION AND PREVENTION OF THE PATHOGEN CAUSING LARGE SCALE DEATH ON Trachinotus ovatus

报道了海南海水网箱养殖卵形鲳大规模死亡的病原及其防治方法。对典型患病个体进行病原分离并经回归感染实验表明 ,引起该病的病原为嗜麦芽假单胞菌。该病原菌对青霉素类药物和呋喃类药物均高度敏感 ,在生产中应用这些药物对该病进行防治效果良好。This paper reported the pathogen and its prevention method of the serious disease which caused large scale death on the cage cultured Trachinotus ovatus in Hainan. The pathogen isolated from the ill fish with typical characteristics was identified as Pseudomonas maltophilia. This pathogen is sensitive to most of the antimicrobial agents including Penicillin, Chloramphenicol, Nitrofurantoin and Ceftazidime. After these medicines were applied to the ill fish, the disease can be effectively prevented.教育部骨干教师基金资助项

反应物分子初始振动激发对hchch2反应的影响

在CH_2~+体系的电子基态势能面上运用准经典轨线方法,研究了当碰撞能E=500 meV时,反应物分子的振动激发对H(~2S)+CH~+(X~1Σ~+)→C~+(~2P)+H_2(X~1Σ_g~+)反应的反应概率、反应截面和立体动力学性质的影响.分别计算了两矢量相关k-j'的P(θ_r)分布,三矢量相关k-k'-j'的P(φ_r)分布以及反应产物的四个极化微分截面.结果表明,产物分子转动角动量不仅在Y轴方向有取向效应,还定于Y轴的正方向.并且发现,随着振动量子数的增加,对反应体系产物分布的影响就越明显

OH Produced from o-nitrophenol photolysis: A combined experimental and theoretical investigation

As an important class of nitroaromatic compounds, nitrophenols are of particular interest since their presence in the environment has been acknowledged. Much work on the occurrence of nitrophenols in the environment, both in the gas and in the condensed phase, has been done, and nitrophenols have been discovered in different atmospheric compartments, such as ambient air, clouds, fog, and snow. Moreover, previous spectroscopic studies revealed that the strong absorption band of nitrophenols is in the atmospherically relevant UV region (300-400 nm), implying the photochemistry of nitrophenols might be important for the atmosphere. In the present work, photodissociation dynamics of o-nitrophenol (HOC6H4NO2) in the gas phase at different photolysis wavelengths (361-390 nm) is investigated, and the nascent OH radical is observed by the single-photon laser-induced fluorescence (LIF) technique. At all photolysis wavelengths, the OH radicals are formed in vibrationally cold state (υ″ = 0), and have similar rotational state distributions. The average rotational temperature for all photolysis wavelengths is approximately 970 ± 120 K, corresponding to a rotational energy of 1.9 ± 0.2 kcal mol-1. The spin-orbit and Λ-doublet states of the OH fragments formed in the dissociation are measured to be nonstatistical distributions. To get an insight into the dissociative mechanism leading to OH formation in the photolysis of o-nitrophenol, the potential energy surfaces of the OH-forming channels are mapped by ab initio theoretical calculations. According to both experimental and theoretical results, a possible mechanism for OH formation is proposed. It is suggested that electronically excited o-nitrophenol mostly relaxes to the lowest excited triplet state (T1) via intersystem crossing followed by intramolecular H transfer to form an aci-nitro isomer, from which OH elimination takes place by N-OH bond cleavage most likely. The transition state for the N-OH bond rupture channel is located on the T1 state and characterization of the dissociative state to be T1 state strongly supports much of our experimental findings

一种近共心稳定腔气体拉曼激光器

本发明为一种采用气体拉曼介质的内腔式拉曼激光器，由左凹面腔镜（对基频激光高反射），基频激光介质，基频激光调Q单元，基频激光介质泵浦源，二相色镜（对基频激光高透射，对拉曼激光高反射），拉曼池，右凹面腔镜（对基频激光高反射，对拉曼激光透射率为T）和拉曼激光全反镜共八部分组成。本发明中基频激光的束腰位置在拉曼池内，因此拉曼池内的基频激光光束小，功率密度大，有利于提高拉曼转化效率；激光介质处基频光的光束半径大，可以充分利用基频激光介质；另外两个凹面腔镜之间的距离L稍小于两腔镜曲率半径R1、R2之和，因此该谐振腔满足稳定腔条件，且其束腰半径非常小,功率密度大，可以有效降低拉曼转化阈值