排序方式： 共有30条查询结果，搜索用时 281 毫秒
11.
Controlling spatial structure of forested landscapes: a case study towards landscape management 总被引：6，自引：0，他引：6
Emin Z. Baskent 《Landscape Ecology》1999,14(1):83-97
12.
Having a history of nearly 150 years in Turkey, potato has become one of the most important agricultural crops of the country.
Potato production, processing, marketing and consumption have become a major sector as well. However, regardless of these
advancements, the Turkish potato sector has still not reached its full potential. Therefore, different approaches are needed
in the Turkish potato sector to overcome chronic problems as soon as possible. This paper summarizes the past and the current
situation of the Turkish potato industry and evaluates its weaknesses and strengths. 相似文献
13.
Ron Baron Alexander Davie Alec Gaines Darren Grant Oya Okay Emin Ozsoy 《International Aquatic Research》2014,6(3):95-111
The development of cultures of phytoplankton adapting throughout several days in an axenic, continuous-flow chemostat to yield a steady kinetic state of competing species is described mathematically. The adaptation of the growth rate to the chemostat environment inhibits integration of the equation of conservation of phytoplankton populations, though eventually when a steady state is reached the growth rate becomes equal to the rate of flow through the chemostat. Representation of species growth rates by a Verhuls formulation utilising experimentally determinable intra- and interspecies interaction constants permits the rapid prediction of the adaptation and alteration in the populations of competing phytoplankton species with changes in the chemostat environment. Illustrations of the behaviour of two and three competing species are extended to consideration of the stabilities of cultures of many competing species. Stable steady states of phytoplankton in a continuous-flow chemostat comprise a classic thermodynamic system and consequently the utilisation of light energy by the cells varies inversely with their growth rate. It is probable that when growth is nutrient limited, intra-and interspecies interaction parameters diminish as the demands of consumption are more nearly matched by the ratios of the limiting nutrients. 相似文献
14.
Emin Bülent Erenolu 《植物养料与土壤学杂志》2019,182(3):496-501
The present study aimed to test the contribution of the iron (Fe) deficiency‐induced uptake system to zinc (Zn) and copper (Cu) uptake by using bread wheat (Triticum aestivum cv. Bezostaja). For this purpose, two different uptake experiments, long‐term and short‐term, were set up in a nutrient solution culture under controlled growth chamber conditions. For the long‐term experiment, wheat cv. plants were grown with different concentrations of Fe or Zn. Results show that there was an uptake system induced under Fe‐limiting conditions which also contributed to Zn and Cu uptake. However, the Zn deficiency‐induced uptake mechanism affected neither Fe nor Cu uptake by wheat. Short‐term uptake experiments indicate that Fe deficiency‐induced Zn2+ uptake was more enhanced than the absorption of Zn‐phytosiderophore (PS) complexes. In addition, the Fe‐deficient plants absorbed more Zn in comparison to those plants supplied with sufficient Fe. Similar tendencies in Zn uptake under Fe deficiency in both short‐ and long‐term experiments suggest that there may be a specific Fe uptake system induced under Fe‐limiting conditions for non‐chelated metals in bread wheat. Moreover, this system also contributes to the transport of inorganic forms of some other metals, such as Zn and Cu. Although evidence is still needed involving the use of molecular biological techniques, it is hypothesized that IRT‐like proteins are responsible for this uptake system. Moreover, the release of Fe deficiency‐induced phytosiderophores and uptake of Fe(III)‐phytosiderophore complexes may not be the only mechanisms involved in the adaptation of wheat to Fe‐limiting conditions. 相似文献
15.
A survey carried out during the years 2001-2002 revealed that people who lived in the villages of Yunt Mountain use large number of plants for medicinal purposes. Fifty-four medicinal plants belonging to 32 family were recorded. Among them 41 species were wild and 13 species were cultivated plants. 相似文献
16.
Ewen McLean Edward M. Donaldson Emin Teskeredzic Lawrence M. Souza 《Fish physiology and biochemistry》1993,11(1-6):363-369
Diploid (2n) and triploid (3n) coho salmon were fed upon control (diet 1), recombinant porcine somatotropin (rpST)-supplemented (diet 2; 20 μg rpST/g body wt/day) or rpST/antacid/detergent-containing feed (diet 3; 20, 100 &; 20 μg/g body wt/day respectively) for 16 wk. Fish were weighed and measured bimonthly and their relative performances assessed. By wk 4, 2n and 3n groups fed upon diet 2 were significantly heavier and longer than control 2n fish. At the termination of the trial, diet 3 fed animals were greater in weight than all other treatment groups. Diet 3 salmon also returned better feed conversion efficiencies than either diet 1 or 2 groups. RpST therapy induced a 28.7% and 60.2% increase in group wt for 3n diet 2/3 coho versus (?vs?) controls. Likewise, 2n rpST-treated fish increased wt ?vs?2n control coho by 17% and 50% respectively over the same period. No differences were recorded between groups for body moisture, but diet 2, 3n and both diet 3 groups exhibited decreased condition factors when compared to control fish (p ≤ 0.05). 相似文献
17.
18.
19.
Regional development theories have experienced a transition from Keynesian state‐led economic development models to development based on public–private partnerships, innovation, industrial districts, etc. With the increasing concern for innovative milieu, products, process, organizational, and institutional innovations have assumed an important place in regional development policies. All these regional development paradigms have formed the basis of the initiation of a new process in regional development called the new regionalism, which includes cumulative efforts to revitalize local economic growth. In this paper, we identify technological levels of 26 NUTS 2‐level regions according to the Organisation for Economic Co‐operation and Development (OECD)'s classification. Then, we develop an innovation and competitiveness index for Turkey by employing principal component analysis. In conclusion, we formulate some workable policy solutions and suggestions for regional economies in Turkey. According to the results, Istanbul is the most innovative and competitive region in Turkey. Ankara is becoming a regional knowledge cluster, thanks to its strong R&D infrastructure and highly qualified researchers. 相似文献
20.
Wild forest fires are one of the greatest environmental disasters affecting forest resources. Along the coastal zone of the Mediterranean region in Turkey,forested areas are classified as first-degree, fire-sensitive areas. Every year, thousands of hectares of forests have been destroyed in Turkey. In this study, fire-access zones were determined in the Mediterranean forests of Turkey, by utilizing geographic information systems(GIS) technology. The effective reach distance of fire hoses from both sides of roads was considered in order to delineate fireaccess zones. The effective reach distance can vary based on the technical capabilities and hydraulic capacity of fire trucks(minimum and maximum pressures on water pump);terrain structures(uphill, downhill and flat); and ground slope. These factors and their influences were studied in fire sensitive forest areas located in the eastern Mediterranean city of Kahramanmaras? in Turkey. First, terrain structures on both sides of the road network and groundslope classes were determined based on GIS data layers.Then, fire access zones were delineated according to water pressure data, terrain structures, and ground-slope classes.The results indicated that 69.30 % of the forested areas were within the fire-access zones, while the rest of the forest was out of reach the fire hoses. The accessible areas were also calculated for forested areas with different firesensitivity degrees. The accessible areas were 69.59, 69.96,and 67.16 % for the forested areas that are sensitive to fires at the first, second, and third degrees, respectively. This finding has implications for the monitoring and management of fire threats in areas outside of the reach distance.The outside areas should receive extra attention and monitoring during the fire season so that fires are detected ahead of time and management has sufficient time to react.Besides, new roads should be considered for these areas in order to access more lands in a shorter amount of time. 相似文献