藻类的接触致毒──恢复培养及其对化学物质的安全评价

应用接触致毒一恢复培养法，试验共有五个浓度组，即0．10，0．130．180．24和0.316mg／LCu2＋，和对照组．以比增长率作指标，实验结果经回归分析：确定Cu2＋对月牙藻逐步加深的三种致毒效应，半数效应浓度、完全抑藻浓度和完全杀藻浓度分别为0204、0．297和0316mg／LCu2＋由恢复培养可知在杀藻效应浓度以上，藻类细胞受到不可逆转损害．恢复培养试验结果能客观地反映了毒物对藻类的毒理效应．

藻类的接触致毒——恢复培养及其对化学物质的安全评价

应用接触致毒-恢复培养法,试验共有五个浓度组,即0.10,0.13,0.18,0.24和0.316mg/LCu~(2+),和对照组。以比增长率作指标,实验结果经回归分析:确定Cu~(2+)对月牙藻逐步加深的三种致毒效应,半数效应浓度、完全抑藻浓度和完全杀藻浓度分别为0.204、0.297和0.316mg/LCu~(2+)。由恢复培养可知在杀藻效应浓度以上,藻类细胞受到不可逆转损害。恢复培养试验结果能客观地反映了毒物对藻类的毒理效应。

PEG诱导的柱胞鱼腥藻（Anabaenacylindrica）原生质球融合

以多盐复合液配制的ＰＥＧ溶液可诱导柱胞鱼腥藻原生质球融合，融合率约５％，融合时间６～４０ｍｉｎ，可发生两个或多个原生质球的融合，ＰＥＧ使用浓度１０％

江汉平原47号钻孔中化石硅藻的新种类

在江汉平原47号钻孔中的46.60—2.20m层位上(上更新统到全新统),含有丰富的化石硅藻,经鉴定有4个新种类,即Cymbella jianghanensis sp.nov.,C.tenuistriata sp.nov.,C.cistula(Hempr.) Grun.var.retcta var.nov.,Gomphonema tropicale Brun var.nonpunctatum var.nov..同时,对一个变种进行了重新命名和特征修改,即Eunotia clevei Grun.var.ob

Effects of dietary manganese on growth and tissue manganese concentrations of juvenile gibel carp, Carassius auratus gibelio

A 68-day growth trial was conducted in a flow-through system to determine the effect of dietary manganese levels on growth and tissue manganese concentration of juvenile gibel carp (Carassius auratus gibelio). Seven purified diets containing 7.21, 8.46, 9.50, 10.50, 13.03, 19.72 and 22.17 mg manganese (as manganic sulfate) per kilogram diet were fed to triplicate groups of fish (initial weight 3.21 +/- 0.01 g). The results showed that dietary manganese levels did not significantly affect feed intake of the fish. Specific growth rate, feed efficiency, total hepatic superoxide dismutase activity, carcass and skeletal manganese concentration increased significantly with increased dietary manganese(P < 0.05) while condition factor decreased significantly(P < 0.05). It was concluded that dietary requirement of manganese was 13.77 mg Mn per kilogram diet. Carcass and skeletal manganese concentration could also be used to evaluate the manganese requirement. Total hepatic superoxide dismulase activity was not a sensitive indicator for dietary requirement.

Garra tengchongensis, a new cyprinid species from the Upper Irrawaddy River basin in Yunnan, China (Pisces : Teleostei)

Garra tengchongensis, a new cyprinid species from the upper Irrawaddy River basin in Tengchong county, Yunnan province, China, is differentiated from all other Chinese and Southeast Asian Garra species except G. kempi by having a combination of the following characters: two pairs of barbels, no proboscis on snout, 12 circumpeduncular scales and 37-42 lateral line scales. Garra tengchongensis is distinguished from G. kempi in having a cylindrical anterior body, a deeper body, a smaller mental adhesive disc, a scaled breast and belly, and a blunt snout.

Mode Simulation for Midinfrared Microsquare Resonators With Sloped Sidewalls and Confined Metals

EQUILATERAL-TRIANGLE; MU-M; LASERS; MICROLASERS; MICRODISK Abstract: Mode characteristics for midinfrared microsquare resonators with sloped sidewalls and confined metal layers are investigated by finite-difference time-domain (FDTD) techniques. For a microsquare with a side length of 10 mu m, the mode quality (Q)-factors of 8329, 4772, and 2053 are obtained for TM5,7 mode at wavelength 7.1 mu m by three-dimensional FDTD simulations, as the tilting angles of the side walls are 90 degrees, 88 degrees, and 86 degrees, respectively. Furthermore, microsquare resonators laterally surrounded by SiO2 and metal layers are investigated by the two-dimensional FDTD technique for the metal layers of Au, Ti-Au, Ag-Au, and Ti-Ag-Au, respectively.

Development of Swept Frequency Method for Measuring Frequency Response of Photodetectors Based on Harmonic Analysis

We develop a swept frequency method for measuring the frequency response of photodetectors; (PDs) based on harmonic analysis. In this technique, a lightwave from a laser source is modulated by a radio-frequency (RF) signal via a Mach-Zehnder LiNbO3 modulator, and detected by a PD under test. The measured second-order harmonic of the RF signal contains information of the frequency responses and nonlinearities of the RF source, modulator, and PD. The frequency response of the PD alone is obtained by deducting the known frequency responses and nonlinearities of the RF source and modulator. Compared with the conventional swept frequency method, the measurement frequency range can be doubled using the proposed method. Experiment results show a good agreement between the measured results and those obtained using other techniques.

A time-varying controllable fault-tolerant field associative memory model and its simulation

A time-varying controllable fault-tolerant field associative memory model and the realization algorithms are proposed. On the one hand, this model simulates the time-dependent changeability character of the fault-tolerant field of human brain's associative memory. On the other hand, fault-tolerant fields of the memory samples of the model can be controlled, and we can design proper fault-tolerant fields for memory samples at different time according to the essentiality of memory samples. Moreover, the model has realized the nonlinear association of infinite value pattern from n dimension space to m dimension space. And the fault-tolerant fields of the memory samples are full of the whole real space R-n. The simulation shows that the model has the above characters and the speed of associative memory about the model is faster.

Magnetron sputtering growth of InAs0.3Sb0.7 films on (100) GaAs substrates: Strong effect of growth conditions on film structure

The growth of highly lattice-mismatched InAs0.3Sb0.7 films on (100) GaAs Substrates by magnetron Sputtering has been investigated and even epitaxial lnAs(0.3)Sb(0.7) films have been successfully obtained. A strong effect of the growth conditions on the film structure was observed, revealing that there was a growth mechanism transition from three-dimensional nucleation growth to epitaxial layer-by-layer growth mode when increasing the substrate temperature. A qualitative explanation for that transition was proposed and the critical conditions for the epitaxial layer-by-layer growth mode were also discussed. (c) 2005 Elsevier B.V. All rights reserved.

Design of high brightness cubic-GaN LEDs grown on GaAs substrate

The Principle of optical thin film was used to calculate the feasibility of improving the light extraction efficiency of GaN/GaAs optical devices by wafer-bonding technique. The calculated results show that the light extraction efficiency of bonded samples can be improved by 2.66 times than the as-grown GaN/GaAs samples when a thin Ni layer was used as adhesive layer and Ag layer as reflective layer. Full reflectance spectrum comparison shows that reflectivity for the incident light of 459.2 nm of the bonded samples was improved by 2.4 times than the as-grown samples, which is consistent with the calculated results.

一个支持规约获取的形式规约语言

该文介绍了形式规约语言LFC设计的一些主要方面，并通过例子说明了LFC的一些特色形式。形式规约语言LFC是为支持软件形式规约的获取工作而开发的。该语言以一种新的递归函数，即定义在上下文无关语言上的递归函数为基础，以上下文无关语言为数据类型，在语言级支持规约获取。LFC语言已被用作形式规约获取系统SAQ的一部分。使用表明，LFC是一个能力强、易使用的语言，适合软件形式规约获取之用，并且适合其它一些用途。