Functional differentiation of two general-odorant binding proteins in Hyphantria cunea (Drury) (Lepidoptera: Erebidae)     

Xiaoqing Zhang  Endang R. Purba  Jing Sun  Qing-He Zhang  Shuang-Lin Dong  Ya-Nan Zhang  Peng He  Dingze Mang  Longwa Zhang 《Pest management science》2023,79(9):3312-3325

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保种群体遗传结构变化的模拟研究     

芒来 《内蒙古农业大学学报(自然科学版)》1991,(2)

本文运用电子计算机模拟的方法,分析了影响畜禽保种的主要因素,并通过不同参数组合(包括起始基因频率、群体有效含量和世代数等)的模拟试验得出三个主要结论: 1 在有性繁殖的有限群体中,原封不动地保存群体基因库中的每个基因(包括频率很低的基因)是根本不可能的。 2 在完全实行随机交配的情况下,长期保存频率较高的基因也需要相当大的群体才有可能。 3 频率较高基因的保存也不能单纯依靠群体大小,还需借助于选择。只有这样才能在小群体内长期保存频率较高的基因。  相似文献   

近期糖料与食糖市场分析展望     

马光霞 《农业展望》2007,3(11):13-15

本文对2006／07榨季食糖市场进行了简要的总结分析；对2007／08榨季国内外糖料及食糖的生产、价格走势、供求关系等进行了预测展望。  相似文献   

Adaptation of Asia-Pacific forests to climate change     

Guangyu Wang  Tongli Wang  Haijun Kang  Shari Mang  Brianne Riehl  Brad Seely  Shirong Liu  Futao Guo  Qinglin Li  John L. Innes 《林业研究》2016,27(3):469-488

Climate change is a threat to the stability and productivity of forest ecosystems throughout the Asia-Pacific region. The loss of forests due to climate-induced stress will have extensive adverse impacts on biodiversity and an array of ecosystem services that are essential for the maintenance of local economies and public health. Despite their importance, there is a lack of decision-support tools required to evaluate the potential effects of climate change on Asia-Pacific ecosystems and economies and to aid in the development of regionally appropriate adaptation and mitigation strategies. The project Adaptation of Asia-Pacific Forests to Climate Change, summarized herein, aims to address this lack of knowledge and tools and to provide support for regional managers to develop effective policy to increase the adaptive capacity of Asia-Pacific forest ecosystems. This objective has been achieved through the following activities: (1) development of a high-resolution climate downscaling model, ClimateAP, applicable to any location in the region; (2) development of climate niche models to evaluate how climate change might affect the distribution of suitable climatic conditions for regionally important tree species; (3) development and application of forest models to assess alternative management strategies in the context of management objectives and the projected impacts of climate change; (4) evaluation of models to assess forest fire risk and the relationship between forest fire and climate change; (5) development of a technique to assess ecosystem carbon storage using LiDAR; and (6) evaluation of how vegetation dynamics respond to climate change using remote sensing technology. All project outputs were developed with a focus on communication and extension to facilitate the dissemination of results to regional forest resource managers to support the development of effective mitigation and adaptation policy.  相似文献   

鱼类脂类营养的研究   总被引：1，自引：0，他引：1  

麻艳群 《饲料工业》2011,32(14)

<正>脂类是鱼类生长发育中必不可少的营养元素。在饲料中添加脂类,能为鱼类提供最有效的能源(可提供相当于蛋白质和碳水化合物2.25倍的能量)。鱼类对多糖等碳水化合物的利用效率不高,因此对于鱼类而言,脂类作为能源物质的重要性更为突出。除此之  相似文献   

内蒙古乌审马染色体核型研究   总被引：5，自引：0，他引：5  

张焱如  乌尼尔夫  白克力亚  芒来 《华北农学报》2005,20(1):108-110

采用外周血淋巴细胞培养方法和常规染色体制备技术，对内蒙古乌审马染色体核型进行了分析研究。结果表明：乌审马染色体核型2n=64，雌性核型为64，XX；雄性核型为64，XY。32对染色体中，31对常染色体，1对性染色体；常染色体中，13对为亚中和中着丝粒染色体，18对为端着丝粒染色体；X染色体为较大的亚中部着丝点染色体，Y染色体为最小的端着丝点染色体。通过对乌审马的染色体核型分析，为其分子原位杂交及基因定位奠定基础。  相似文献   

感染土传小麦花叶病毒的小麦花叶病的电子显微镜研究   总被引：2，自引：0，他引：2  

徐绍华  蔡文启  彭学贤  莽克强 《植物病理学报》1984,14(2):87-89

 经对山东省崂山地区获得的自然感病的小麦病叶进行了电镜的观察和研究。指出在早春时节小麦返青以后很快开始显示症状,沿叶脉出现短的褪绿色条纹,植株生长受阻,矮缩,黄化以至不能抽穗。该病毒粒子为细长的杆状,长度120~270nm,直径为18~20nm。值得注意的是在狭窄的胞质区可经常见到聚集的病毒颗粒,其中大部分病毒附着在膜结构上。当横切时病毒颗粒呈电子透明的空心,围绕这个空心周围是一个着色很深的直径约为10nm的核酸环,围绕这个核酸环周围是一个密度不大的蛋白外壳。病毒颗粒的聚集大多与很多弯曲的管状物的形成聚集相伴随着。也看到了完全由病毒颗粒所组成的晶体状聚集物。根据以上所述,该病原鉴定为土传小麦花叶病毒。  相似文献   

Cytotoxic, cytoprotective and antioxidant effects of isolated phenolic compounds from fresh ginger     

Peng F  Tao Q  Wu X  Dou H  Spencer S  Mang C  Xu L  Sun L  Zhao Y  Li H  Zeng S  Liu G  Hao X 《Fitoterapia》2012,83(3):568-585

Twenty-nine phenolic compounds were isolated from the root bark of fresh (Yunnan) ginger and their structures fully characterized. Selected compounds were divided into structural categories and twelve compounds subjected to in-vitro assays including DPPH radical scavenging, xanthine-oxidase inhibition, monoamine oxidase inhibition, rat-brain homogenate lipid peroxidation, and rat pheochromocytoma PC12 cell and primary liver cell viability to determine their antioxidant and cytoprotective properties. Isolated compounds were also tested against nine human tumor cell lines to characterize anticancer potency. Several diarylheptanoids and epoxidic diarylheptanoids were effective DPPH radical scavengers and moderately effective at inhibiting xanthine oxidase. An enone–dione analog of 6-shogaol (compound 2) was isolated and identified to be most effective at protecting PC12 cells from H₂O₂-induced damage. Almost all tested compounds inhibited lipid peroxidation. Three compounds, 6-shogaol, 10-gingerol and an enone-diarylheptanoid analog of curcumin (compound 6) were identified to be cytotoxic in cell lines tested, with KB and HL60 cells most susceptible to 6-shogaol and the curcumin analog with IC₅₀ < 10 μM. QSAR analysis revealed cytotoxicity was related to compound lipophilicity and chemical reactivity. In conclusion, we observed distinct compounds in fresh ginger to have biological activities relevant in diseases associated with reactive oxygen species.  相似文献   

GIS与数据处理技术在三北防护林工程监测和管理信息系统中的应用   总被引：1，自引：0，他引：1  

胡莽 《防护林科技》2005,(2):52-55

介绍了地理信息技术和数据处理技术在三北防护林工程监测和管理信息系统中的应用,并对系统的数据处理模块进行说明,同时提出了地理信息技术在管理信息系统应用中应注意的问题。  相似文献   

Climate change impacts and forest adaptation in the Asia–Pacific region: from regional experts' perspectives     

Guangyu Wang  Shari L.Mang  Brianne Riehl  Jieying Huang  Guibin Wang  Lianzhen Xu  Kebiao Huang  John Innes 《林业研究》2019,(1):277-293

Expert opinions have been used in a variety of fields to identify relevant issues and courses of action. This study surveys experts in forestry and climate change from the Asia–Pacific region to gauge their perspectives on the impacts of climate change and on the challenges faced by forest adaptation in the region, and explores recommendations and initiatives for adapting forests to climate change. There was consensus regarding the impacts of climate change on forest ecosystems and on economic sectors such as agriculture and forestry. Respondents also indicated a lack of public awareness and policy and legislation as challenges to addressing climate change. However, the results indicate differences in opinion between regions on the negative impacts of climate change and in satisfaction with actions taken to address climate change,highlighting the need for locally specific policies and research. The study presents specific recommendations to address issues of most concern, based on subregion and professional affiliation throughout the Asia–Pacific region.The results can be used to improve policy and forest management throughout the region. This research will also provide valuable suggestions on how to apply research findings and management recommendations outside of the AP region. The conclusions should be communicated relative to the level of the research and the target audience,ensuring that scientific findings and management recommendations are effectively communicated to ensure successful implementation of forest adaptation strategies.  相似文献