Studies on fecundity of Puntius sarana (Ham.) in relation to total length, total weight and ovary weight

A total of 43 mature female of Puntius sarana (Ham.) ranging from 204 mm to 320 mm in length and 102 to 482 g in weight were used for present studies. The relationship between fecundity with respect to total length (TL), total weight (TW) and ovary weight (OW) was found to be linear. The coefficient of co-relation 'r' of the above relationships was found to be 0.5947, 0.5761 and 0.9837 respectively. All these values are highly significant (P=0.01) indicating a close relationship between these parameters. However, as indicated by value of 'r' (0.9837), the fecundity is more closely related to ovary weight and hence the ovary weight may be a better index of fecundity than the total length or weight.

Construction, characterization and chromosomal mapping of bacterial artificial chromosome (BAC) library of Yunnan snub-nosed monkey (Rhinopithecus bieti)

We constructed a high redundancy bacterial artificial chromosome library of a seriously endangered Old World Monkey, the Yunnan snub-nosed monkey (Rhinopithecus bieti) from China. This library contains a total of 136 320 BAC clones. The average insert size of BAC clones was estimated to be 148 kb. The percentage of small inserts (50-100 kb) is 2.74%, and only 2.67% non-recombinant clones were observed. Assuming a similar genome size with closely related primate species, the Yunnan snub-nosed monkey BAC library has at least six times the genome coverage. By end sequencing of randomly selected BAC clones, we generated 201 sequence tags for the library. A total of 139 end-sequenced BAC clones were mapped onto the chromosomes of Yunnan snub-nosed monkey by fluorescence in-situ hybridization, demonstrating a high degree of synteny conservation between humans and Yunnan snub-nosed monkeys. Blast search against human genome showed a good correlation between the number of hit clones and the size of the chromosomes, an indication of unbiased chromosomal distribution of the BAC library. This library and the mapped BAC clones will serve as a valuable resource in comparative genomics studies and large-scale genome sequencing of nonhuman primates. The DNA sequence data reported in this paper were deposited in GenBank and assigned the accession number CG891489-CG891703.

血清白蛋白的功能及应用

血清白蛋白是脊椎动物血浆中含量最丰富的蛋白质.人血清白蛋白是由585个氨基酸组成的单链蛋白质,分子量为67 kDa.成熟的人血清白蛋白是一个心形分子,由3个结构相似的α-螺旋结构域组成.不同来源的血清白蛋白的氨基酸序列及其空间结构非常保守,它具有结合和运输内源性与外源性物质,维持血液胶体渗透压,清除自由基,抑制血小板聚集和抗凝血等生理功能.最近研究发现,蟾蜍血清白蛋白可能与其皮肤呼吸有关.人血清白蛋白目前已广泛应用于临床.

Observation on some of the environmental parameters and feed quality of selected golda (Macrobrachium rosenbergii) farms in Bangladesh

A study was conducted to ascertain the existing farm water, effluent and feed quality of selected giant freshwater prawn farms from major prawn farming areas (Bagerhat Sadar, Noakhali Sadar and Mymensingh) of Bangladesh during July to November 2005. Water quality parameters such as the mean values of dissolved oxygen, alkalinity, nitrite-nitrogen, phosphate-phosphorus and ammoniacal nitrogen did not show any significantly differences among the farming areas. Whereas significant differences (p < 0.05) were observed in the mean values of temperature, secchi disc visibility, pH and chlorophyll a. However, all the water quality parameters in the farming areas were within the suitable range for prawn culture. There was no significant variation in nutrients concentration of discharged effluent among the prawn farming areas. All of the nutrients measured in effluent water were within the acceptable range and did not seem to pose a direct threat to the recipient environment. The analysed crude protein contents of commercial CP, Quality and Saudi-Bangla prawn feeds were 31.84%, 27.21% and 28.97%, respectively, whereas all analysed farm made feeds were less than 25%. The other nutrients of prawn feeds varied largely with the source of feeds and ingredients used to prepare feed. The annual yield of prawn varied from 320.4 to 512.6 kg/ha (mean 412.3 kg/ha) depending on the management system.

贵州福泉市草坪害虫区系调查

2005年7～8月以贵州省福泉市草坪与农田、灌草丛为2个调查样地,对采集的大量昆虫标本进行检索、分类、统计处理、区系分析.采集到昆虫标本50 320只,分隶于8目、29科、67属、70种,其中,草坪害虫有8目、19科、29属、32种;农田、灌草丛有8目、28科、56属、61种.研究发现,2个样地中害虫群落种类组成和结构基本相似;鳞翅目害虫(除地老虎等个别种外)是地面害虫的优势类群;鞘翅目害虫是地下害虫的优势类群;草坪害虫区系主要由周边农田,园林和其他天然植被中害虫的迁入形成.

微卫星及其应用

微卫星是广泛分布于真核生物基因组中的短串联重复序列(1-5bp),具有突变速率快、多态性高等特性。已被广泛应用于生物遗传作图、群体遗传研究、个体间亲缘关系鉴定等方面。简要论述了微卫星的突变、位点的分离、数据的收集、在生物学中的应用及其存在的缺陷。

A phylogeny of Chinese leaf monkeys using mitochondrial ND3-ND4 gene sequences

The phylogeny of Chinese leaf monkeys, especially the snub-nosed monkeys (Rhinopithecus), has not been thoroughly investigated using molecular sequence data, perhaps due to their rarity in the wild and their poor representation in institutional collections. Despite several proposed classifications, systematic relationships of these species remain poorly defined and this has hindered their conservation. To clarify the phylogenetic relationships of the leaf monkey clade in China, we sequenced the mitochondrial ND3, ND4L, ND4, tRNA(Arg), tRNA(His), tRNA(Ser), and tRNA(Leu) genes for Rhinopithecus bieti, R. roxellana, Trachypithecus francoisi, T. f. leucocephalus, and T. phayrei as well as Pygathrix nemaeus and Colobus guereza. We included a rotal of 2252 characters for each individual, excluding gaps in primary sequences. Our interpretation of the results from character- and distance-based phylogenetic analyses suggest that (1) Pygathrix nemaeus is sister to Rhinopithecus rather than to Trachypithecus though it is quite divergent from the former; (2) the Yunnan snub-nosed monkey, Rhinopithecus bieti, represents a valid species; (3) the white-headed leaf monkey is not a distinct species, but instead is a subspecies of Trachypithecus francoisi (T. f. leucocephalus), though it should still be considered a separate evolutionarily significant unit (ESU); and (4) because two individuals of the Phayrei's leaf monkey, T. phayrei, are genetically distinct from one another, a more extensive revision of the taxonomy of this putative species in China is needed. These results, plus ongoing work on the molecular systematics of the entire Asian leaf monkey radiation, can provide a sound basis for identifying the appropriate units of conservation for this endangered group of primates.

17种植物中蛋白质提取物的抗HIV-1活性

以化合物对ＨＩＶ１诱导Ｃ８１６６细胞形成合胞体的抑制实验和化合物对ＨＩＶ１感染细胞的保护实验作为初筛方法，筛选了来源于７科１７种植物的４７个样品，其中８个样品经测定是核糖体失活蛋白（ＲＩＰｓ），其余为粗提蛋白。进而测定了初筛有抗ＨＩＶ活性的化合物对共培养、急性和慢性感染的ＨＩＶ１ｐ２４抗原表达水平的影响，用间接荧光染色检测这些化合物对ＨＩＶ抗原阳性细胞率的影响，以确证其抗ＨＩＶ活性。天花粉蛋白（ＴＣＳ）、南方栝楼蛋白峰Ⅴ、南方栝楼蛋白峰Ⅵ均显著地抑制合胞体的形成；巴Ⅱ、丝瓜子蛋白、油瓜根蛋白、木盍藤子蛋白有一定的抑制作用。老鼠拖瓜蛋白、大叶木鳖子根蛋白、西双版纳根Ⅱ等粗提蛋白有显著的抑制作用。ＲＩＰｓ不能保护ＨＩＶ１感染细胞的死亡。ＴＣＳ显著地抑制了ＨＩＶ１急性感染中ｐ２４抗原的表达，减少了ＨＩＶ抗原阳性细胞数，但它们均不影响共培养细胞融合、ＨＩＶ１慢性感染中ｐ２４抗原表达水平。结果表明，除ＴＣＳ等已知ＲＩＰｓ外，还有一些新的ＲＩＰｓ具有不同程度的抗ＨＩＶ活性。

Embryonic and larval development of Mystus gulio (Ham.)

Mystus gulio eggs are strongly adhesive and contain relatively small yolk (0.75-1.0 mm). The egg envelop is thick and transparent. First cleavage (two cells), four cells, eight cells, sixteen cells and multi cells stages were found 20, 25, 35-40, 60 and 70 minutes after fertilization, respectively. The morula stage was visualized within 1.5 h after fertilization. The heart beat visible and the circulatory system commenced after 16 h of fertilization. Embryos hatched 18-20h after activation of egg. The newly hatched larva measured 2.82±0.03 mm in length and 0.32±0.06 mg in weight. The yolk sac was fully absorbed by the third day though larvae commenced exogenous feeding even before completion of yolk absorption. A 5-day old post larva began wandering in search of food. Ten-day old post larvae endowed with eight branched rays in dorsal fin and seven in caudal fin. Fifteen-day old post larvae had the pectm:al spine become stout though the embryonic fin folds had to be disappeared. The length of fingerlings ranged from 25-30 mm after 30 days, and their external features were just like those of an adult except that they were not sexually matured.

兔抗人外周血单核细胞、兔抗猴脾脏淋巴细胞免疫血清的制备及其在分离人和猕猴胚胎内细胞团中的应用

采用梯度离心的方法用淋巴细胞分离液从浓缩的人白细胞悬液中分离人外周血单核细胞，从猕猴新 鲜脾脏中研磨分离猕猴脾脏淋巴细胞；分别将人外周血单核细胞和猕猴脾脏淋巴细胞作为免疫原，每次通过耳 缘静脉注射4×10s个细胞免疫日本大耳白兔，每周免疫一次，共免疫3次，制备兔抗人外周血单核细胞和兔抗 猕猴脾脏淋巴细胞免疫血清。体外培养人和猕猴胚胎至囊胚，采用制备的免疫血清，分离人和猕猴囊胚内细胞 团，用于建立人和猕猴胚胎干细胞系。结果如下：(1)用半微量细胞毒实验法测得兔抗人外周血单核细胞免疫 血清和兔抗猕猴脾脏淋巴细胞免疫血清的效价分别为1：320和1：640；(2)两种免疫血清成功地裂解了15个人 囊胚和33个猕猴囊胚的滋养层细胞，分离出了内细胞团，表明免疫血清的制备取得了成功，为建立人和猕猴 胚胎干细胞系奠定了基础。

云南滇池濒危特有种滇池金线鲃人工繁殖初报

滇池金线鲃(Sinocyclocheilus grahami)是滇池湖泊生态系统的指示物种和特有种.因水质污染和外来物种入侵等因素的影响,该鱼类自1986年起就从湖体中消失,仅有湖周围的少数龙潭中尚保存有少量滇池金线鲃.至2007年3月初,有两次繁殖试验取得了成功.先后试验了5尾雌鱼和6尾雄鱼,获得鱼卵约1 600粒,并实施干法受精.约有1 320粒受精,平均受精率为73%.孵化出鱼苗约480尾,平均孵化率为36%.经10天饲养,约有95%以上的鱼苗存活,体长达8-12 mm.滇池金线鲃人工繁殖成功的意义有三点:能有效保护该物种免于灭绝;繁殖的鱼苗放归湖泊合适水域,将有助于恢复滇池的土著生物多样性;有助于推动当地水产养殖业从非土著鱼类养殖向土著鱼类养殖的方向转变.

Real-time experimental demonstration of low-cost VCSEL intensity-modulated 11.25 Gb/s optical OFDM signal transmission over 25 km PON systems.

The feasibility of utilising low-cost, un-cooled vertical cavity surface-emitting lasers (VCSELs) as intensity modulators in real-time optical OFDM (OOFDM) transceivers is experimentally explored, for the first time, in terms of achievable signal bit rates, physical mechanisms limiting the transceiver performance and performance robustness. End-to-end real-time transmission of 11.25 Gb/s 64-QAM-encoded OOFDM signals over simple intensity modulation and direct detection, 25 km SSMF PON systems is experimentally demonstrated with a power penalty of 0.5 dB. The low extinction ratio of the VCSEL intensity-modulated OOFDM signal is identified to be the dominant factor determining the maximum obtainable transmission performance. Experimental investigations indicate that, in addition to the enhanced transceiver performance, adaptive power loading can also significantly improve the system performance robustness to variations in VCSEL operating conditions. As a direct result, the aforementioned capacity versus reach performance is still retained over a wide VCSEL bias (driving) current (voltage) range of 4.5 mA to 9 mA (275 mVpp to 320 mVpp). This work is of great value as it demonstrates the possibility of future mass production of cost-effective OOFDM transceivers for PON applications.