浅析影响本校艺术设计部学生社会交往能力的关键因子

随着我国经济的迅猛发展,对当代劳动力素质提出了更高的要求,在人才大量涌现的今天,中职院校的学生群体逐渐成为社会劳动力的重要组成部分,为各行各业提供基础性劳动力,提高学生的整体就业水平,让中职学生能够更好的发挥其作用也成为社会关注的问题之一。因此找出影响学生社会交往能力的关键因子非常重要。为此,针对学生的主要问题进行教材编写和“社会交往能力提升”课堂教学。并通过教学前后的学生社会交往能力的测试对比,寻找影响学生社会交往能力的关键因子。

Key Environmental Factors Monitoring System of Low-power Greenhouse Based on WSN Technology

A low-power environmental monitoring system based on WSN technology is proposed to effectively monitor the environmental status and ensure the healthy growth of greenhouse crops in the greenhouse. The system performs dynamic mon- itoring on the environmental data of temperature, humidity, illumination, soil tempera- ture and humidity of the greenhouse, and it reduces the energy consumption by us- ing solar energy and lithium battery as the power supply mode and dynamic power management algorithm combined with improved routing protocol. Stable and reliable, the system could effectively monitor the key environmental factors in the green- house, making it of certain promotion value.

Oxidative modification of caspase-9 facilitates its activation via disulfide-mediated interaction with Apaf-1

Intracellular reactive oxygen species （ROS） are known to regulate apoptosis. Activation of caspase-9, the initial caspase in the mitochondrial apoptotic cascade, is closely associated with ROS, but it is unclear whether ROS regulate caspase-9 via direct oxidative modification. The present study aims to elucidate the molecular mechanisms by which ROS mediate caspase-9 activation. Our results show that the cellular oxidative state facilitates caspase-9 activation. Hydrogen peroxide treatment causes the activation of caspase-9 and apoptosis, and promotes an interac- tion between easpase-9 and apoptotic protease-activating factor 1 （Apaf-1） via disulfide formation. In addition, in an in vitro mitochondria-free system, the thiol-oxidant diamide promotes auto-cleavage of caspase-9 and the caspase-9/ Apaf-1 interaction by facilitating the formation of disulfide-linked complexes. Finally, a point mutation at C403 of caspase-9 impairs both H2O2-promoted caspase-9 activation and interaction with Apaf-1 through the abolition of disulfide formation. The association between cytochrome c and the C403S mutant is significantly weaker than that between cytochrome c and wild-type caspase-9, indicating that oxidative modification of caspase-9 contributes to apoptosome formation under oxidative stress. Taken together, oxidative modification of caspase-9 by ROS can medi- ate its interaction with Apaf-1, and can thus promote its auto-cleavage and activation. This mechanism may facilitate apoptosome formation and caspase-9 activation under oxidative stress.

The sulfur metabolism regulator MetR is a global regulator controlling phytochrome-dependent light responses in Aspergillus nidulans

Phytochrome-dependent light signaling has been studied in several fungi.In Aspergillus nidulans lightstimulated phytochrome activates the high-osmolarity glycerol(HOG)signaling pathway and thereby controls the expression of a large number of genes,many of which are related to stress responses.In a genome-wide expression analysis in A.nidulans we found that phytochrome,fph A,is under strict expression control of the central regulator of the sulfur-starvation response,Met R.This transcriptional regulator is required for the expression of genes involved in inorganic sulfur assimilation.In the presence of organic sulfur,Met R is probably ubiquitinated and possibly degraded and the transcription of sulfur-assimilation genes,e.g.,sulfate permease,is turned off.The expression analysis described here revealed,however,that Met R additionally controls the expression of hundreds of genes,many of which are required for secondary metabolite production.We also show that met R mutation phenocopies fph A deletion,and five other histidine-hybrid kinases are down-regulated in the met R1 mutant.Furthermore,we found that light and phytochrome regulate the expression of at least three carbon–sulfur hydrolases.This work is a further step towards understanding the interplay between light sensing and metabolic pathways.

High-altitude tree growth responses to climate change across the Hindu Kush Himalaya

Aims Rapid warming at high altitudes may lead to a higher sensitivity in tree growth to temperature.The key factors constraining tree radial growth and to what extent regional tree growth has suffered from climatic changes are unclear.Methods Tree-ring width data were collected from 73 sites across the Hindu Kush Himalaya(HKH),including three dominant genera(Abies,Juniperus and Picea)at high altitudes over 3000 m.Dynamic time warping was introduced to develop subregional chronologies by considering the synchrony of annual tree growth among different sites.We quantified the contribution of the climate variables,and analyzed the spatiotemporal variation of the growth–climate relationship.Important Findings The site chronologies were grouped into three clusters,corresponding to the three distinct bioclimatic zones,i.e.the western HKH,central-eastern HKH and southeastern Tibetan Plateau(TP).Tree growth was positively correlated to winter and spring precipitation in the drier western HKH,and to winter temperature and spring precipitation in the humid southeastern TP.Tree growth was markedly constrained by the minimum temperature,especially in winter,with its importance increasing from the west toward the east.As shown by moving correlation analysis,the signal of winter temperature in tree growth was weakened in the western and central-eastern HKH,while it was enhanced in the southeastern TP following rapid warming since the 1980s.Our results highlight that continuous warming may cause forest recession due to warming-induced moisture deficit in the western HKH,but forest expansion in the southeastern TP.