窗斑野螟属分类学研究（鳞翅目：草螟科：野螟亚科）

窗斑野螟属Discothyris Warren, 1895包含3种：锈斑窗斑野螟D. ferruginata (Moore, 1888),大冠窗斑野螟D. megalophalis Hampson, 1899和痕窗斑野螟D. vestigialis (Snellen, 1890)。本文基于外生殖器特征确认了窗斑野螟属为野螟亚科成员,对该属进行了重新描述,首次记录了痕窗斑野螟在中国的分布,并提供了成虫和外生殖器特征图以及分种检索表。     

A comparison between cation and protein phosphorylation effects on the fluorescence induction curve in chloroplasts treated with 3-(3,4-dichlorophenyl)-1,1-dimethylurea

Fluorescence induction curves in chloroplasts phosphorylated by the thylakoid protein kinase activated at low light intensity and high chlorophyll concentration have been measured. At 5 mM Mg²⁺, phosphorylation did not preferentially quench variable fluorescence. At 1 mM, preferential quenching of variable fluorescence was observed, indicating a second effect of phosphorylation at low Mg²⁺ (Horton, P. and Black, M.T. (1982) Biochim. Biophys. Acta 680, 22–27). Comparison of the extent of fluorescence decrease and the resulting ratio of variable to maximum fluorescence after phosphorylation and after lowering Mg²⁺ concentration demonstrated a difference between these two mechanisms of lowering of fluorescence. The significance of these results in terms of how phosphorylation may alter membrane organization is discussed.     

新合成的蛋白质和RNA从离体萌发的花粉中释放

应用同位素放射自显影技术,以~3H-尿嘧啶和~3H-亮氨酸作前体,对人工萌发花粉中新合成的 RNA 和蛋白质进行标记;并借助 RNA 合成抑制剂放线菌素 D 和蛋白质合成抑制剂环己亚胺的对比试验,确证了君子兰花粉在萌发过程中,向外释放了新合成的 RNA 和蛋白质。动态如下:标记后1小时,花粉尚未萌发,大量的 RNA 和蛋白质已合成;2小时后,新合成的蛋白质向花粉管方向转移;5小时后扩散到培养基中。新合成的 RNA 在90分钟内暂留在营养核和生殖细胞中;2小时后扩散到花粉细胞质;3小时后集中到花粉管顶端;5小时后释放到花粉外。文章还讨论了技术的关键问题和现象的生物学意义。     

安徽白马寨、清凉峰和六股尖的新地理分布植物

近年来我们从事了安徽省植物的调查、研究与植物标本的采集工作,1983年4—11月间,本文作者沈显生、张小平、刘登义三人曾分别到皖鄂边境的本省金寨县白马寨(海拔1729米)、皖浙边境的本省歙县清凉峰(海拔1787米)、皖赣边境的本省休宁县六股尖(海拔1630米),广泛收集资料和采集大量植物标本,并进行整理与鉴定。现将确认为是安徽省地理分布新记录的属共5个(Actaea L., Eutrema R. Br., Aegopodi-     

The filling phase of Mazvikadei Reservoir,Zimbabwe

Limnological measurements during the first year of filling of the newly formed Mazvikadei Reservoir in Zimbabwe showed variations in dissolved oxygen as well as soluble forms of phosphorus and nitrogen. The ratios of calcium to other major cations were: Ca:Mg = 0.38, Ca:Na = 0.50 and Ca:K = 2.0. The low Ca:Mg ratio may suppress development of mollusc populations, thus keeping the reservoir snail free. Conductivity was 160 μScm^-1. Daytime pH was 6.95–7.8. The water was dark-brown in colour, 90% of incident light was attenuated in the top 0.75 m in May, and in the top 3.5 m in August. Positive net photosynthesis was only recorded above a depth of 0.1 m, at 0.5 m and 1.0 m depths, it was negative. Zooplankton consisted of nine rotifer, four cladoceran, two cyclopoid and one calanoid species.     

内蒙古赤峰市红菇科真菌物种资源及经济评价

对赤峰市赛罕乌拉、达里湖和黑里河等自然保护区的200余份红菇科真菌进行调查研究。鉴定出红菇科真菌38种,其中内蒙古新记录5种,红菇属27种,乳菇属11种。按经济价值进行划分,食用菌28种,药用菌16种,其中15种有不同程度的抑制肿瘤作用,毒菌7种。所有引证标本均保存于赤峰学院菌物标本室(CFSZ)。     

浙江地区梨树上粉虱类害虫种类初记

为摸清浙江地区梨树上粉虱类害虫种类,通过采集梨树上的粉虱伪蛹制作玻片标本后进行观察鉴定.通过形态学研究,共鉴定出梨树粉虱6属、8种,其中梨树寄主新记录种6种,分别为马氏粉虱Aleurolobus marlatti(Quaintance)、杨梅粉虱Parabemisia myricae(Kuwana)、番石榴白棒粉虱Al...     

长江河口及上海地区鱼类新记录种——长身鳜（英文）

2008年5月在崇明岛西端潮间带水域进行鱼类调查时,发现一尾长江河口及上海地区的鱼类新记录种——长身鳜,隶属鲈形目鮨科。主要特征如下：体较细长,近似圆筒形;头长,稍平扁。吻尖。口裂大,下颌明显突出;上颌达眼下方。前鳃盖骨后缘有10枚细锯齿,腹缘有向前倾斜的鳃盖骨棘2枚。鳃盖后端有1枚扁平棘,其上端有较小的短棘1枚。体黄褐色,头背和体侧具不规则的黑点和黑斑。近数十年来由于过度捕捞和水环境污染等原因,导致其资源量急剧减少,已被我国列入濒危动物红皮书。目前,关于长身鳜的资源状况研究十分薄弱,尤其是其繁殖习性、食性和发育等生物学特征研究还未见报道。因此,亟待开展此方面的研究和保护工作。     

Trypanosoma cruzi: Impact of dual-clone infections on parasite biological properties in BALB/c mice

Herein, we have analyzed major biological properties following dual-clone Trypanosoma cruzi infections in BALB/c mice. Eight T. cruzi clonal stocks, two of each principal genotype, including genotype 19 and 20 (T. cruzi I), hybrid genotype 39 (T. cruzi) and 32 (T. cruzi II) were combined into 24 different dual-clone infections. Special attention was given to characterize biological parameters assayed including: prepatent period, patent period, maximum of parasitemia, day of maximum parasitemia, area under the parasitemia curve, infectivity, mortality, and hemoculture positivity. Our findings clearly demonstrated that features resultant of dual-clone infections of T. cruzi clonal stocks did not display either the characteristics of the corresponding monoclonal infections or the theoretical mixture based on the respective monoclonal infections. Significant changes in the expected values were observed in 4.2-79.2% of the mixtures considering the eight biological parameters studied. A lower frequency of significant differences was found for mixtures composed by phylogenetically distant clonal stocks. Altogether, our data support our hypothesis that mixed T. cruzi infections have a great impact on the biological properties of the parasite in the host and re-emphasizes the importance of considering the possible occurrence of natural mixed infections in humans and their consequences on the biological aspects of ongoing Chagas' disease.