犬、猫、貂细小病毒通用快速诊断盒的研制

本文报道,由犬细小病毒灭活抗原、特异抗体、戊二醛醛化猪红细胞及微量血凝板、稀释棒等组成的犬、猫、貂细小病毒通用快诊盒,可用于犬细小病毒性肠炎、猫泛白细胞减少症和水貂肠炎的特异诊断,适合于基层和野外应用,并可在接到病料后4小时内报告结果,有关试剂的有效期在一年以上。     

Human T cell L-plastin bundles actin filaments in a calcium-dependent manner.

The amino acid sequences deduced from cDNA analyses revealed that human leucocyte L-plastin phosphorylated in response to interleukin 1, 2 closely resembles a chicken intestinal microvilli protein, fimbrin, that bundles actin filaments [de Arruda et al. (1990) J. Cell Biol. 111, 1069-1079]. In the present work, it was observed that unphosphorylated L-plastin isolated from human T cells bundled F-actin just as fimbrin does. L-Plastin acted on T cell beta-actin, but hardly acted on muscle alpha-actin or chicken gizzard gamma-actin, whereas fimbrin bundled muscle alpha-actin. Unlike fimbrin, L-plastin's actin-bundling action was strictly calcium-dependent: the bundles were formed at pCa 7, but not at pCa 6. Under suitable conditions, approximately one molecule of L-plastin bound to 8 molecules of actin monomer in the actin filament.     

杂交水稻幼芽呼吸和抗氰呼吸强度的研究

本文研究了13个水稻杂交组合幼芽总呼吸强度和抗氰呼吸强度,发现杂交水稻幼芽总呼吸和抗氰呼吸强度多表现为负优势。杂种幼芽总呼吸强度及抗氰呼吸强度与其亲本均值均呈极显著正相关,回归关系亦极显著。杂种幼芽抗氰呼吸和其中亲值的差值与其父母本之差值呈显著正相关,而杂种幼芽呼吸强度其中亲值的差值与其父母本之差值呈不显著负相关。认为杂种幼芽的抗氰呼吸强度和总呼吸强度均可由其双亲均值预测,抗氰呼吸强度作为杂种优势预测生理指标的潜力更大一些。     

根系环境温度变化对根系吸水和叶片蒸腾的影响

以木本植物银合欢（Ｌｅｕｃａｅｎａｌｅｕｃｏｃｅｐｈａｌａ（Ｌａｍ．）ｄｅＷｉｔ．）和禾本科植物玉米（ＺｅａｍａｙｓＬ．）为材料,研究了根系温度变化对根系吸水和叶片蒸腾的影响。当根系周围温度从２５℃降至１５℃,短时间内（１４ｍｉｎ）可显著促进根系的吸水和提高植株的蒸腾速度,这种促进作用随着低温处理时间的延长而消失。如将根系周围的温度又从１５℃提高到２５℃对根系的吸水和植株的蒸腾速度无明显的影响。低温处理短时间内（２０ｍｉｎ）可提高根系的水导和植株的蒸腾速度,但随着低温处理时间的延长,根系水导和植株的蒸腾速度迅速下降。低温处理３０ｍｉｎ后显著促进根系ＡＢＡ的合成,提高木质部ＡＢＡ的浓度。外源ＡＢＡ处理根系显著降低叶片的蒸腾速度,但对根系的水导有促进作用。结果表明,处理初期低温对根系吸水和植株蒸腾速度的促进与根源ＡＢＡ无关     

Plant–insect chemical communication in ecological communities: An information theory perspective

Cross-species communication, where signals are sent by one species and perceived by others, is one of the most intriguing types of communication that functionally links different species to form complex ecological networks. Global change and human activity can affect communication by increasing fluctuations in species composition and phenology, altering signal profiles and intensity, and introducing noise. So far, most studies on cross-species communication have focused on a few specific species isolated from ecological communities. Scaling up investigations of cross-species communication to the community level is currently hampered by a lack of conceptual and practical methodologies. Here, we propose an interdisciplinary framework based on information theory to investigate mechanisms shaping cross-species communication at the community level. We use plants and insects, the cornerstones of most ecosystems, as a showcase and focus on chemical communication as the key communication channel. We first introduce some basic concepts of information theory, then we illustrate information patterns in plant–insect chemical communication, followed by a further exploration of how to integrate information theory into ecological and evolutionary processes to form testable mechanistic hypotheses. We conclude by highlighting the importance of community-level information as a means to better understand the maintenance and workings of ecological systems, especially during rapid global change.     

Production of docosahexaenoic acid byThraustochytrium roseum

Summary When threeThraustochytrium stains were cultivated in liquid media containing 2.5% starch and 0.2% yeast extract, initial pH 6.0, with shaking under fluorescent light for five days at 25°C, similar biomass yields were observed (9.7–10.3 g L^–1). Contents of docosahexaenoic acid (DHA) in biomass varied: 0.15, 3.55 and 6.40% w/w forT. striatum ATCC 24473,T. aureum ATCC 34304 andT. roseum ATCC 28210, respectively. In further studies,T. roseum produced a maximum titer of 0.85 g of DHA per liter of culture broth. The DHA content of total lipids ranged from 46–49% w/w.     

细胞色素P450scc在人早期胎盘中的表达(简报)

人妊娠期间,胎盘合成大量的类固醇激素,与妊娠的启动、维持、分娩以及胎儿的发育均存在密切的关系。阐明胎盘类固醇激素特别是孕酮合成与分泌的调节机制对于寻找理想的生育调控技术和生殖保健方法具有重要的意义。因此,胎盘类固醇激素合成与分泌的调节向来是生殖生物学与妇产科学领域所关注的焦点问题之一,并为此开展了大量的研究,但迄今仍不清楚,其主要原因之一是     

Influences of forest floor cleaning on the soil respiration and soil physical property of a larch plantation in Northeast China

Aimed to estimate how forest floor cleaning affected the carbon budget and soil physical feature, a 2-yr (2005–2006) measurement on soil respiration, soil bulk density, capillary porosity, soil temperature and soil volumetric moisture was carried out in a larch plantation. Firstly, forest floor cleaning evidently decreased soil respiration. Annual cumulative soil CO₂ efflux decreased from 44.2 μmol·m^?2 a^?1 to 22.4 μmol·m^?2 a^?1. Secondly, cleaning practice slightly increased soil temperature at the growing season, but reduced it at the dominant winter season. It also made soil moisture higher in summer, but lower in spring and autumn. Moreover, the cleaning practice induced more compact soil compared with the uncleaned control. Thirdly, forest floor cleaning of litters and understory shrubs could cause non-respiratory carbon loss of about 175.0 mol·m^?2. This loss decreased from 175.0 mol·m^?2 to 137.4 mol·m^?2 when soil respiratory carbon loss decreased. However, the alteration of soil physical characters in the cleaned plots should be carefully considered since this alteration was not favorable to the growth of larch plantation in a long run.