Elevated temperatures increase leaf senescence and root secondary metabolite concentrations in the understory herbPanax quinquefolius(Araliaceae)

2007 ◽  
Vol 94 (5) ◽  
pp. 819-826 ◽  
Author(s):  
Gera M. Jochum ◽  
Kenneth W. Mudge ◽  
Richard B. Thomas
Keyword(s):  
Secondary Metabolite ◽  
Leaf Senescence ◽  
Elevated Temperatures ◽  
Metabolite Concentrations

Secondary Metabolite Concentrations and Terpene Emissions of Scots Pine Xylem after Long-Term Forest Fertilization

2002 ◽  
Vol 31 (5) ◽  
pp. 1694-1701 ◽  
Author(s):  
S. Turtola ◽  
A.-M. Manninen ◽  
J. K. Holopainen ◽  
T. Levula ◽  
H. Raitio ◽  
...  
Keyword(s):  
Secondary Metabolite ◽  
Scots Pine ◽  
Forest Fertilization ◽  
Metabolite Concentrations

scholarly journals Nutrient and secondary metabolite concentrations in a savanna are independently affected by large herbivores and shoot growth rate

Plant Ecology ◽  
2013 ◽  
Vol 215 (1) ◽  
pp. 73-82 ◽  
Author(s):  
Peter F. Scogings ◽  
Joakim Hjältén ◽  
Christina Skarpe ◽  
Dawood Hattas ◽  
Alpheus Zobolo ◽  
...  
Keyword(s):  
Growth Rate ◽  
Secondary Metabolite ◽  
Shoot Growth ◽  
Large Herbivores ◽  
Metabolite Concentrations ◽  
Shoot Growth Rate

scholarly journals Direct Phenological Responses but Later Growth Stimulation upon Spring and Summer/Autumn Warming of Prunus spinosa L. in a Common Garden Environment

Forests ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 23
Author(s):  
Kristine Vander Mijnsbrugge ◽  
Jessa May Malanguis ◽  
Stefaan Moreels ◽  
Arion Turcsán ◽  
Nele Van der Schueren ◽  
...  
Keyword(s):  
Leaf Senescence ◽  
Radial Growth ◽  
Elevated Temperatures ◽  
Late Summer ◽  
Common Garden ◽  
Growth Stimulation ◽  
Bud Burst ◽  
Ecosystem Responses ◽  
Spring Warming ◽  
Prunus Spinosa

Future predictions of forest ecosystem responses are a challenge, as global temperatures will further rise in the coming decades at an unprecedented rate. The effect of elevated temperature on growth performance and phenology of three Prunus spinosa L. provenances (originating from Belgium, Spain, and Sweden) in a common garden environment was investigated. One-year-old seedlings were grown in greenhouse conditions and exposed to ambient and elevated temperatures in the spring (on average 5.6 °C difference) and in the late summer/autumn of 2018 (on average 1.9 °C difference), while they were kept hydrated, in a factorial design. In the following years, all plants experienced the same growing conditions. Bud burst, leaf senescence, height, and diameter growth were recorded. Height and radial growth were not affected in the year of the treatments (2018) but were enhanced the year after (2019), whereas phenological responses depended on the temperature treatments in the year of the treatments (2018) with little carry-over effects in the succeeding years. Spring warming enhanced more height growth in the succeeding year, whereas summer/autumn warming stimulated more radial growth. Spring warming advanced bud burst and shortened the leaf opening process whereas summer/autumn warming delayed leaf senescence and enlarged the duration of this phenophase. These results can help predict the putative shifts in species composition of future forests and woody landscape elements.

scholarly journals Secondary Metabolites of Hypericum confertum and their Possible Chemotaxonomic Significance

2010 ◽  
Vol 5 (6) ◽  
pp. 1934578X1000500 ◽  
Author(s):  
Cüneyt Çırak ◽  
Jolita Radušienė ◽  
Valdimaras Janulis ◽  
Liudas Ivanauskas
Keyword(s):  
Secondary Metabolites ◽  
Chlorogenic Acid ◽  
Secondary Metabolite ◽  
Room Temperature ◽  
Plant Materials ◽  
First Report ◽  
Metabolite Concentrations

The phloroglucinol derivative hyperforin, the naphthodianthrones hypericin and pseudohypericin, the phenylpropane chlorogenic acid, and the flavonoids rutin, hyperoside, apigenin-7- O-glucoside, kaempferol, quercitrin, quercetin and amentoflavone were investigated in Hypericum confertum growing wild in Turkey. After drying at room temperature, the plant materials were assayed for secondary metabolite concentrations by HPLC. All the listed compounds were detected at various levels. This is the first report on the chemistry of H. confertum.

Characterization of Rare-Earth Fluoride Anti-Stokes Phosphors by Scanning arid Transmission Electron Microscopy

1971 ◽  
Vol 29 ◽  
pp. 142-143
Author(s):  
N. M. P. Low ◽  
L. E. Brosselard
Keyword(s):  
Electron Microscopy ◽  
Rare Earth ◽  
Elevated Temperatures ◽  
Stoichiometric Composition ◽  
Rare Earth Ions ◽  
Crystalline Solid ◽  
Precipitation Process ◽  
Rare Earth Fluoride ◽  
Earth Fluoride ◽  
Rare Earth Fluorides

There has been considerable interest over the past several years in materials capable of converting infrared radiation to visible light by means of sequential excitation in two or more steps. Several rare-earth trifluorides (LaF3, YF3, GdF3, and LuF3) containing a small amount of other trivalent rare-earth ions (Yb3+ and Er3+, or Ho3+, or Tm3+) have been found to exhibit such phenomenon. The methods of preparation of these rare-earth fluorides in the crystalline solid form generally involve a co-precipitation process and a subsequent solid state reaction at elevated temperatures. This investigation was undertaken to examine the morphological features of both the precipitated and the thermally treated fluoride powders by both transmission and scanning electron microscopy.Rare-earth oxides of stoichiometric composition were dissolved in nitric acid and the mixed rare-earth fluoride was then coprecipitated out as fine granules by the addition of excess hydrofluoric acid. The precipitated rare-earth fluorides were washed with water, separated from the aqueous solution, and oven-dried.

Observations oh Nucleation and Growth of Voids in Nickel

1970 ◽  
Vol 28 ◽  
pp. 414-415
Author(s):  
J. L. Brimhall ◽  
H. E. Kissinger ◽  
B. Mastel
Keyword(s):  
High Purity ◽  
Growth Stage ◽  
Elevated Temperatures ◽  
Early Growth ◽  
Nucleation And Growth ◽  
Pure Nickel ◽  
Different Temperatures ◽  
Total Fluence ◽  
Neutron Exposure ◽  
Growth Of Voids

Some information on the size and density of voids that develop in several high purity metals and alloys during irradiation with neutrons at elevated temperatures has been reported as a function of irradiation parameters. An area of particular interest is the nucleation and early growth stage of voids. It is the purpose of this paper to describe the microstructure in high purity nickel after irradiation to a very low but constant neutron exposure at three different temperatures.Annealed specimens of 99-997% pure nickel in the form of foils 75μ thick were irradiated in a capsule to a total fluence of 2.2 × 1019 n/cm2 (E > 1.0 MeV). The capsule consisted of three temperature zones maintained by heaters and monitored by thermocouples at 350, 400, and 450°C, respectively. The temperature was automatically dropped to 60°C while the reactor was down.

Voids in Irradiated Tungsten and Molybdenum

1969 ◽  
Vol 27 ◽  
pp. 190-191
Author(s):  
Robert C. Rau ◽  
Robert L. Ladd
Keyword(s):  
Melting Point ◽  
Fast Neutron ◽  
Neutron Irradiation ◽  
Elevated Temperatures ◽  
Irradiation Temperature ◽  
The Body ◽  
Face Centered Cubic ◽  
Body Centered Cubic ◽  
Cubic Metals ◽  
Face Centered

Recent studies have shown the presence of voids in several face-centered cubic metals after neutron irradiation at elevated temperatures. These voids were found when the irradiation temperature was above 0.3 Tm where Tm is the absolute melting point, and were ascribed to the agglomeration of lattice vacancies resulting from fast neutron generated displacement cascades. The present paper reports the existence of similar voids in the body-centered cubic metals tungsten and molybdenum.

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