نتایج جستجو برای: carex
تعداد نتایج: 967 فیلتر نتایج به سال:
OBJECTIVES To construct a computer assisted information system for the estimation of the numbers of workers exposed to established and suspected human carcinogens in the member states of the European Union (EU). METHODS A database called CAREX (carcinogen exposure) was designed to provide selected exposure data and documented estimates of the number of workers exposed to carcinogens by countr...
BACKGROUND AND AIMS The sedge genus Carex, the most diversified angiosperm genus of the northern temperate zone, is renowned for its holocentric chromosomes and karyotype variability. The genus exhibits high variation in chromosome numbers both among and within species. Despite the possibility that this chromosome evolution may play a role in the high species diversity of Carex, population-leve...
[1] We conducted measurements of methane (CH4) emission and ecosystem respiration on >200 points across the Arctic coastal tundra near Barrow, Alaska, United States, in July 2007 and August 2008. This site contains broad diversity in tundra microtopography, including polygonal tundra, thaw lakes, and drained lake basins. In 2007, we surveyed CH4 emissions across this landscape, and found that s...
Monoecy and protogyny are widespread in wind-pollinated plants and have been interpreted as outcrossing mechanisms, though few studies have investigated their function. Carex, a large genus of anemophilous herbs, is predominantly monoecious and many species are protogynous. We investigated whether monoecy and protogyny limit self-pollination in seven Carex species. We conducted field experiment...
Both the direct effects of warming on a species' vital rates and indirect effects of warming caused by interactions with neighboring species can influence plant populations. Furthermore, herbivory mediates the effects of warming on plant community composition in many systems. Thus, determining the importance of direct and indirect effects of warming, while considering the role of herbivory, can...
Temporal variations in methane emissions from emergent aquatic macrophytes in two boreonemoral lakes
Methane (CH4) emissions via emergent aquatic macrophytes can contribute substantially to the global CH4 balance. We addressed temporal variability in CH4 flux by using the static chamber approach to quantify fluxes from plots dominated by two species considered to differ in flux transport mechanisms (Phragmites australis, Carex rostrata). Temporal variability in daily mean emissions from early ...
Coastal plants are ideal models for studying the colonization routes of species because of the simple linear distributions of these species. Carex extensa occurs mainly in salt marshes along the Mediterranean and European coasts. Variation in cpDNA sequences, amplified fragment length polymorphisms (AFLPs) and simple sequence repeats (SSRs) of 24 populations were analysed to reconstruct its col...
Artocarpus stems (Artocarpus sp.) and Carex grass (Carex have not been applied to fishing gear materials. The fibers produced made into a rope, where this rope is used absorption sinking speed test in fresh water sea water.The of was 320.30% 282,60% water. Meanwhile for 5,78 cm/s 5,08 For the 287,67% 218,02%. Sinking value 2,97 2,67 higher than both types
در بررسی نمونه های جمع آوری شده از تالابهای واقع در دامنه های شمالی و شرقی کوه های سبلان، نمونه های جالبی از جنس carex جمع آوری شد که از میان آنها، نمونه ای تحت c. diandra تعیین نام گردید که اولین گزارش از گونه مذکور برای ایران تلقی می گردد. علاوه بر این، تعدادی گونه جالب دیگر از این جنس نیز جمع آوری شده است که در مقاله به آنها اشاره شده است. شرح مورفولوژیکی و پراکنش جغرافیایی گونه مذکور در ایر...
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