نتایج جستجو برای: acer pseudo
تعداد نتایج: 52909 فیلتر نتایج به سال:
in the last decade, frequency of late cold incidence has increased in the upland forest nurseries. the aim of present study was to reduce the damage caused by spring frost and to increase the efficiency of persian maple seedlings production in mountain nurseries. this study was conducted as split plot design with two main treatments and three replications in two consecutive years (2009-2010) in...
relative to a hereditary torsion theory $tau$ we introduce a dimension for a module $m$, called {em $tau$-rank of} $m$, which coincides with the reduced rank of $m$ whenever $tau$ is the goldie torsion theory. it is shown that the $tau$-rank of $m$ is measured by the length of certain decompositions of the $tau$-injective hull of $m$. moreover, some relations between the $tau$-rank of $m$ and c...
گونه papaver pseudo-orientale از بخش oxytona جنس papaver منبع مهمی برای آلکالوئید ها مانند ایزوتبائین است. در این پژوهش تولید کالوس و باززایی درون شیشه ای این گونه از ریز نمونه های هیپوکوتیل-کوتیلدون در محیط کشت پایه موراشیگ و اسکوگ (ms) و گامبورگ (b5) حاوی سطوح مختلف نفتالین استیک اسید (naa)، کینتین (kin) و یا بنزیل آدنین (ba) در دمای 20 درجه سانتیگراد و دوره نوری 16 ساعت روشنایی بررسی شد. تجز...
Plants extracts are good resources to find functional compounds for human health. The following eight plants were collected and total phenolic contents were determined. Acer psedo-siebolianum showed the highest phenolic contents, 16.4 mg/g, whereas Cercidiphyllum japonica showed the lowest contents, 1.9 mg/g. The DPPH free radical scavenging capacities of the plant extracts showed high activity...
The Kidder problem is uxx + 2x(1 − αu)−1/2ux = 0 with u(0) = 1 and u(∞) = 0 where α ∈ [0, 1]. This looks challenging because of the square root singularity. We prove, however, that |u(x ;α) − erfc(x)| ≤ 0.046 for all x, α. Other very simple but very accurate curve fits and bounds are given in the text; |u(x ;α) − erfc(x + 0.15076x/(1 + 1.55607x2))| ≤ 0.0019. Maple code for a rational Chebyshev ...
جنس افرا acer از خانواده ( aceraceae یا sapindaceae ) شامل 10 گونه در ایران است. این گیاهان دارای ارزش اقتصـــــادی، زینتی و دارویی هستند. 7 گونه از این جنس که در بخش های مختلف ایـــــران توزیع و یا کاشته شده اند در این پروژه مورد بررسی واقع شـــــده اند: acer velutinum, a.monspessullanum, a.platanoides, a.campestre, a.cappadocicum, a.negundo, a.palmatum. در این پروژه در مجموع 37 واحد جمعیتی از...
An inhibitor extracted from short day treated Acer negundo leaves was compared to abscisic acid in 4 different solvent systems. The chromatographic properties of abscisic acid and the inhibitor were in very close agreement. Treatment of Acer negundo plants under non-hardening preconditions (long days) with either the inhibitor or abscisic acid increased hardiness after a hardening period of 3 w...
Winter moth, Operophtera brumata L. (Lepidoptera: Geometridae), has been defoliating hardwood trees in eastern Massachusetts since the 1990s. Native to Europe, winter moth has also been detected in Rhode Island, Connecticut, eastern Long Island (NY), New Hampshire, and Maine. Individual tree impacts of winter moth defoliation in New England are currently unknown. Using dendroecological techniqu...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید