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The early-1990s’ war in former Yugoslavia led to severe damage to the urban and peri-urban forests of Sarajevo, capital of Bosnia and Herzegovina. During the Siege of Sarajevo (April 1992–March 1996), after the energy supplies to the city had been cut off, over three-quarters of all urban trees and nearly all peri-urban trees within the siege line were cut down for firewood by the desperate residents. After the war, the city trees were quickly and effectively replanted, and Sarajevo provides a useful case study of urban forest recovery. This study presents the observations and measurements, of trees that survived the war and the trees planted after the war, made in Sarajevo in May 2008. We summarize the lessons learned from the Sarajevo experience, regarding both damage and replanting, which include the close relationship between the urban tree damage and the specifics of military operations, the importance of the initial planting stock, and the advantages of collaboration between academic researchers and urban forest managers. 相似文献
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国家蔬菜工程技术研究中心共收集苋菜及部分野生蔬菜资源1070份。按食用器官分类,共分为七大类数十个种类,显示出我国蔬菜遗传资源的多样性。分析测定了703份野生蔬菜的营养成分。针对目前我国在野生蔬菜资源的基础研究和开发利用中存在的问题,提出了相应的对策。 相似文献
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酵母浸膏蛋白胨与pH对草菇培养与生物学效率影响 总被引:1,自引:0,他引:1
研究了酵母浸膏、蛋白胨和pH对草菇菌丝生长与生物学效率的影响。试验结果表明,在PDA培养基中加入酵母浸膏和蛋白胨能促进菌丝生长,最适添加质量浓度分别为0.30%酵母浸膏和0.50%蛋白胨。在栽培过程中,对菌丝体表面最佳喷施溶液组合为0.50%蛋白胨、0.30%酵母浸膏,调节溶液pH9.0,对比空白对照能提高生物学效率13.56%。 相似文献
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PTEN is a candidate tumor suppressor which has sequence homology withdual-specifici-ty phosphatase. PTEN is a multifunctional protein endowed with a phosphatase activity capable of dephosphory-lating both tyrosine phosphate, serine/threonine phosphate residues on proteins and phospholipids of the phosphati dylinositol pathway. PTEN appears to be mutated at considerable frequency in several types of humantumors, including those frombrain, breast, endometrium, and prostate. PTEN play an important role in pathogenesis of tumor, tumor cell invasion and metastasis. In this review, we will discuss the chemical structure of PTEN, its phosphatase activity, the ability of affecting signal transduction, and its mutational status in cancer. 相似文献
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Urban landscape sustainability and resilience: the promise and challenges of integrating ecology with urban planning and design 总被引:2,自引:1,他引:1
Jack Ahern 《Landscape Ecology》2013,28(6):1203-1212
The twenty-first century global population will be increasingly urban-focusing the sustainability challenge on cities and raising new challenges to address urban resilience capacity. Landscape ecologists are poised to contribute to this challenge in a transdisciplinary mode in which science and research are integrated with planning policies and design applications. Five strategies to build resilience capacity and transdisciplinary collaboration are proposed: biodiversity; urban ecological networks and connectivity; multifunctionality; redundancy and modularization, adaptive design. Key research questions for landscape ecologists, planners and designers are posed to advance the development of knowledge in an adaptive mode. 相似文献
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Fresh onion seeds desiccated to 6.0% seed moisture content (SMC) were stored in various packaging materials under different storage conditions. Seeds packed in aluminum-laminated pouches beside those stored with silica gel at 25 °C maintained satisfactory germinability and vigour after 12 months. Desiccated seeds stored in moisture impervious containers produced more vigourous seedlings. Germination potential of onion seeds increased with reduced SMC besides storage in moisture impervious packets along with desiccants as physiological and biochemical attributes are regulated. Seed viability and vigour decreased with accelerated ageing due to increased lipid peroxidation, decreased activities of several free radical and peroxide scavenging enzymes. Electrical conductance of seed leachates also increased with ageing. Thus, adoption of appropriate storage temperature and moisture control techniques would significantly affect onion seed quality, which was due to minimum accumulation of free peroxide radicals and enhanced activity of free radical scavenging enzymes. 相似文献
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苹果轮纹病害流行研究及防控 总被引:2,自引:0,他引:2
检索1994~2010年主题为"苹果轮纹病"的论文,逐篇统计论文的发表时间、发病地点及病害发生强度、规律、防治方法等不同变量。结果表明:我国苹果轮纹病的发生逐年加重,各苹果主产区发生较不均衡,但有从东向西逐渐扩散的趋势;从文献内容上看,对轮纹病的防治和药剂试验等内容较多,而病害的基础研究和规律、预测、预报等方面较少;该文在详细分析的基础上提出了苹果轮纹病的防控建议。 相似文献
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Xinjuan Lu Liwang Liu Yiqin Gong Liping Zhao Xianyong Song Xianwen Zhu 《Scientia Horticulturae》2009,122(4):645-648
A total of 18 genotypes of broccoli were subjected to random amplified polymorphic DNA (RAPD) and inter-simple sequence repeat (ISSR) marker analysis. Seventy-four RAPD and eight ISSR primers generated 344 and 67 polymorphic bands, respectively. All broccoli genotypes could be distinguished with two-primer combinations, indicating that RAPD and ISSR markers can be used to efficiently identify broccoli cultivars. These 18 broccoli genotypes could be separated into two major sub-groups. The first major sub-group (A) included 13 genotypes and the second major sub-group (B) was comprised of five genotypes belonging to early-maturating cultivars. Genetic diversity analysis was performed on the 18 broccoli genotypes, one radish genotype, and six related Brassica accessions. All accessions could be clustered into two groups (radish and Brassica) based on the unweighted pair group of arithmetic average (UPGMA) cluster analysis. The UPGMA analysis indicated that broccoli is most closely related to cauliflower, than to cabbage and Chinese cabbage. 相似文献
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Field experiments were conducted on carrot (Daucus carota var. sativus), involving a slicer variety, Caro choice; and a dicer variety, Red Core Chantenay (RCC), to determine the interactive effects of seeding rates (SR) and line spacings (LS), to identify optimal SR and LS and to understand the influence of various seed spacings on yield and root recovery. Caro choice and RCC were sown at various seeding rates: 18, 22, 27, 33 (slicer); 9, 12, 14, 18 (dicer) seeds 30 cm−1 at three different line spacings: 2.5, 3.8 and 5.7 cm. The interaction between SR and LS on total root yield and yield of supreme quality roots (1.9–3.1 cm diameter) was not significant whereas, the interaction for recovery of root grades was significant for Caro choice. In contrast, the interaction between SR and LS was marginally significant for the total yield and for the yield of supreme quality roots (3.8–5.1 cm diameter) but not for the recovery percentage of any of the root grades in RCC. A line spacing of 3.8 cm and SR of 22 seeds 30 cm−1 for Caro choice, and LS of 5.7 cm and SR of 18 seeds 30 cm−1 for RCC were optimal to obtain the highest total and supreme quality root yield, respectively. Seed spacing between the range of 4.6–38 cm2 exhibited a significantly negative relationship with total root yield and marginally significant positive relationship with the recovery percentage of 1.9–3.8 cm roots in Caro choice. Neither total yield nor recovery percentage of 3.8–5.1 cm roots showed any significant relationship with seed spacing in RCC, suggesting that RCC may be less sensitive to the spatial variations compared to Caro choice and would adjust physiologically and/or morphologically to equalize yield. 相似文献
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The pattern of fruit growth in mango ‘Dashehari’ (Mangifera indica L.) was sigmoid. Pollinated ovaries and young fruits dropped in two main waves: 0–14 days and 28–35 days. A third wave, a mild one, was continuous and irregular from 35 days after pollination to maturity of the fruit.One acidic and one non-acidic auxin and one acidic inhibitor were detected in the immature fruit. The increase in the levels of auxin corresponded with a period of rapid fruit growth, while high levels of inhibitor tended to correspond with a high rate of fruit drop from pollination to 42 days. The auxins appear to play a major role in the growth of the fruit, whereas the inhibitor appears to cause fruit drop. 相似文献
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蝗虫在我国有着悠久的食用历史。随着全球蛋白质的紧缺和新资源食品的开发,蝗虫蛋白质再一次被人们关注。本文叙述了蝗虫蛋白的含量、组成、营养价值以及功能蛋白质,并且介绍了蝗虫蛋白质的提取方法,以期为蝗虫食品的研究开发提供指导。 相似文献
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《Scientia Horticulturae》2002,92(2):97-105
Anatomical vessel features of Guatemalan, Mexican and West Indian races and cultivars Colı́n V-33, Fuerte and Hass of Persea americana Mill. were studied in 10-year-old trees grown in the field under similar environmental and management conditions with the main purpose to get insight on anatomical variation among genotypes. The cultivars differed anatomically from the races, showing an inverse relationship between races and cultivars with respect to vessel frequency and diameter, however, relative conductivity was similar among cultivars suggesting an adjustment between vessel diameter and frequency that maintains a similar relative conductivity among genotypes. The three races had the higher vessel frequency and the narrower vessel diameters as well as the lowest vulnerability index values compared to Hass and Fuerte cultivars. An important finding in this study was that cultivar Colı́n V-33, a dwarf genotype, had intermediate anatomical characteristics between races and the other cultivars suggesting a better adapted hydraulic system to water deficits. 相似文献
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居住区绿化树种固碳释氧和降温增湿效应研究 总被引:12,自引:0,他引:12
以青岛市居住区广泛应用的14种植物为材料,利用Li-6400便携式光合测定系统进行了光合生理生态指标的测定.并对其固碳释氧与降温增湿效应进行了量化研究.结果表明:14种植物的固碳释氧量由高到低排列为榆叶梅、悬铃木、绦柳、月季、紫叶桃、火棘、丁香、紫叶李、国槐、海桐、樱花、女贞、金叶女贞、红枫.降温增湿能力由高到低为榆叶梅、悬铃木、绦柳、月季、紫叶桃、火棘、丁香、紫叶李、国槐、海桐、樱花、女贞、金叶女贞、红枫.同时对各树种固碳释氧量的趋势进行了分析,以期为居住区绿化树种的选择与配置提供科学依据. 相似文献
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