周期型马来丝虫微丝蚴寿命的观察

将实验感染周期型马来丝虫的长爪沙鼠的微丝蚴蚴阳性腹腔稀释液,移注于正常沙鼠腹腔内,微丝蚴除能在腹腔内长期生存外,还可出现于外周血液中,其在外周血液内末次阳性检出时间最长可超过32周,在腹腔液内末次阳性检出时间最长为77周,故马来微丝蚴在沙鼠外周血液中的最长寿命不短于7.5月,而在腹腔液内的最长寿命可超过1.5年以上。     

Comparing global models of terrestrial net primary productivity (NPP): analysis of the seasonal atmospheric CO2 signal

Eight terrestrial biospheric models (TBMs) calculating the monthly distributions of both net primary productivity (NPP) and soil heterotrophic respiration (R_H) in the Potsdam NPP Model Intercomparison workshop are used to simulate seasonal patterns of atmospheric CO₂ concentration. For each model, we used net ecosystem productivity (NEP = NPP – R_H) as the source function in the TM2 atmospheric transport model from the Max-Planck Institute for Meteorology. Comparing the simulated concentration fields with detrended measurements from 25 monitoring stations spread over the world, we found that the decreasing seasonal amplitude from north to south is rather well reproduced by all the models, though the amplitudes are slightly too low in the north. The agreement between the simulated and observed seasonality is good in the northern hemisphere, but poor in the southern hemisphere, even when the ocean is accounted for. Based on a Fourier analysis of the calculated zonal atmospheric signals, tropical NEP plays a key role in the seasonal cycle of the atmospheric CO₂ in the whole southern hemisphere. The relatively poor match between measured and predicted atmospheric CO₂ in this hemisphere suggests problems with all the models. The simulation of water relations, a dominant regulator of NEP in the tropics, is a leading candidate for the source of these problems.     

济南市社会经济发展与儿童少年生长的长期变化

本文分析了１９５６－１９９５年济南市７－１８岁儿童少年生长发育的变化趋势。３９年间,男女生身高平均增长值分别为１０．８３ｃｍ的９．４７ｃｍ,平均每１０年增长２．７６８ｃｍ和２．４３ｃｍ;男一体重增长值分别为９．１９ｋｇ和５．１２ｋｇ,平均每１０年增长２．３６ｋｇ和１．３１ｋｇ。将不同年代人均工业总产值作对数转换后发现,与各年龄儿童少年身高、体重的发育水平呈明显的直线正相关,不同年代人均工业总产值的     

中国长管蚜亚科19种新纪录

我们在东北农林蚜虫区系考察中发现下述长管蚜亚科19种为我国首次纪录。 1.茜草叶无网蚜Acyrthosiphon rubifoliae(Shinji)此种名为一疑难名称(nomen dubium),我们采得此种与原记述特征相符。寄主:茜草*。分布:吉林(长白山);日本。 2.日本忍冬圆尾蚜Amphicercidus japonicus(Hori)寄主:莫罗氏忍冬、忍冬属植物*。分布:辽宁(沈阳);日本。 3.飞帘短尾蚜Brachycadus(Acaudus)cardui(L.)寄主:第一寄主李、榆叶梅*、樱桃李、乌荆子、杏、小樱桃、甜樱桃;第二寄主菊科、紫草科。     

土壤皿蛛二新种记述（蜘蛛目：皿蛛科：微蛛亚科）

蚊微蛛属Solenysa是一类小型微蛛,以往该属仅记述一种,Solenysa mellottei Simon,1984,分布于朝鲜和日本,我国尚系首次记述该属蜘蛛。本属最典型的特征为:体微小,腹柄发达而使蜘体呈蚁状,Ⅰ—Ⅳ均仅有一根背刺。本文所记述的二种蜘蛛均系土壤蜘蛛。文内所用单位均为mm。全部模式标本均保存于中国科学院动物研究所。     

Long-term exposure to a continuous 900 MHz electromagnetic field disrupts cerebellar morphology in young adult male rats

The pathological effects of exposure to an electromagnetic field (EMF) during childhood and adolescence may be greater than those from exposure during adulthood. We investigated possible pathological changes in the cerebellum of adolescent rats exposed to 900 MHz EMF daily for 25 days. We used three groups of six 21-day-old male rats as follows: unexposed control group (Non-EG), sham-exposed group (Sham-EG) and an EMF-exposed group (EMF-EG). EMF-EG rats were exposed to EMF in an EMF cage for 1 h daily from postnatal days 21 through 46. Sham-EG rats were placed in the EMF cage for 1 h daily, but were not subjected to EMF. No procedures were performed on the Non-EG rats. The cerebellums of all animals were removed on postnatal day 47, sectioned and stained with cresyl violet for histopathological and stereological analyses. We found significantly fewer Purkinje cells in the EMF-EG group than in the Non-EG and Sham-EG groups. Histopathological evaluation revealed alteration of normal Purkinje cell arrangement and pathological changes including intense staining of neuron cytoplasm in the EMF-EG group. We found that exposure to continuous 900 MHz EMF for 1 h/day during adolescence can disrupt cerebellar morphology and reduce the number of Purkinje cells in adolescent rats.     

几种念珠菌DNA总含量的流式细胞分析

应用流式细胞术(FCM)对处于稳定生长阶段的念珠菌属(Candida)的7种8株念珠菌进行了DNA总含量的流式细胞(FCM)分析。这8株念珠菌是:白念珠菌(C.albicans)2株,热带念珠菌(C.tropicalis),克柔念珠菌(C.krusei),近平滑念珠菌(C.parapsiolosis),乳酒念珠菌(C.kefyr),白念珠菌星形变种(C.stellatoidea),即血清B型白念珠菌,季也蒙念珠菌(C.guilliermondii)各一株。应用EB一步插入法染色,用鸡红细胞(CRBC)作为内参标准进行DNA总含量测定。分析结果表明:稳定生长阶段的组方图上,大多数念珠菌细胞处于DNA合成周期的G_0/G_1期;DNA总含量有明显的种间和种内差异。     

Comparing global models of terrestrial net primary productivity (NPP): importance of vegetation structure on seasonal NPP estimates

Estimates of the seasonal absorbed fraction of photosynthetically active radiation (FPAR) and net primary productivity (NPP) are compared among four production efficiency models (PEMs) and seven terrestrial biosphere models simulating canopy development. In addition, the simulated FPARs of the models are compared to the FASIR-FPAR derived from NOAA-AVHRR satellite observations. All models reproduce observed summergreen phenology of temperate deciduous forests rather well, but perform less well for raingreen phenology of savannas. Some models estimate a much longer active canopy in savannas than indicated by satellite observations. As a result, these models estimate high negative monthly NPP during the dry season. For boreal and tropical evergreen ecosystems, several models overestimate LAI and FPAR. When the simulated canopy does respond to unfavourable periods, the seasonal NPP is largely determined by absorbed photosynthetically active radiation (APAR). When the simulated canopy does not respond to unfavourable periods, the light use efficiency (LUE) influences the seasonal NPP more. However, the relative importance of APAR and LUE can change seasonally.