Modeling Nutrient Uptake as a Component of Loblolly Pine Response to Environmental Stress

1998 ◽  
pp. 293-304
Author(s):  
J. Michael Kelly ◽  
Ruth D. Yanai
Keyword(s):  
Environmental Stress ◽  
Nutrient Uptake ◽  
Loblolly Pine

scholarly journals Temporal variation in nutrient uptake capacity by intact roots of mature loblolly pine

2005 ◽  
Vol 272 (1-2) ◽  
pp. 253-262 ◽  
Author(s):  
Melissa S. Lucash ◽  
J. Devereux. Joslin ◽  
Ruth Yanai
Keyword(s):  
Temporal Variation ◽  
Nutrient Uptake ◽  
Loblolly Pine ◽  
Uptake Capacity ◽  
Intact Roots

scholarly journals Nutrient uptake by intact and disturbed roots of loblolly pine seedlings

2008 ◽  
Vol 64 (1) ◽  
pp. 15-20 ◽  
Author(s):  
Melissa S. Lucash ◽  
Ruth D. Yanai ◽  
J. Devereux Joslin
Keyword(s):  
Nutrient Uptake ◽  
Loblolly Pine ◽  
Pine Seedlings

Influence of seed size on germination and early development of loblolly pine (Pinustaeda L.) germinants

1983 ◽  
Vol 13 (1) ◽  
pp. 40-44 ◽  
Author(s):  
J. R. Dunlap ◽  
J. P. Barnett
Keyword(s):  
Environmental Stress ◽  
Early Development ◽  
Seed Size ◽  
Loblolly Pine ◽  
Size Class ◽  
Seedling Size ◽  
Laboratory Conditions ◽  
Large Seed ◽  
Growing Conditions

Seed size was examined as a possible explanation for variation in the size of containerized loblolly pine (Pinustaeda L.) seedlings. Under laboratory conditions of minimal environmental stress, larger seed were found to germinate more quickly and produce a larger germinant after 28 days of growth. In a similar experiment conducted under greenhouse growing conditions, large seed produced the largest seedlings. Size differences among seedlings in both experiments resulted from differences in the rate of germination unique to each seed size class. Consequently, seedling size and possibly uniformity of growth were considered to be a function of germination patterns which were strongly influenced by seed size and weight.

Effect of Some Natural Mineral Waters in Nutrient Uptake by Caco-2 Cells

2010 ◽  
Vol 80 (2) ◽  
pp. 131-143 ◽  
Author(s):  
Pedro Gonçalves ◽  
João R. Araújo ◽  
Fátima Martel
Keyword(s):  
Nutrient Uptake ◽  
Mineral Waters ◽  
Distilled Water ◽  
Natural Mineral ◽  
Minute Exposure

We studied the effect of some mineral waters and some of their constituents on the apical uptake of 14C-butyrate (14C-BT) and 3H-O-methyl-D-glucose (3H-OMG) by Caco-2 cells. Uptake of 14C-BT increased after a 20-minute exposure to 1 % (v/v) distilled water, and, compared to distilled water, it was decreased by Pedras Salgadas® 1 % (v/v) and Melgaço® 5 % (v/v), and increased by Vidago® 5 % (v/v). Moreover, it increased after a 48-hour exposure to Vidago® or Melgaço® waters (5 % (v/v)). Also, uptake of 14C-BT was reduced after a 20-minute exposure to MgCl2, MgSO4, or CaCl2. Uptake of 3H-OMG was reduced after a 20-minute exposure to Melgaço® water [1 % (v/v)], when compared to distilled water. Also, a 48-hour exposure to Pedras Salgadas® or Melgaço® water (5 % (v/v)) increased and decreased uptake, respectively. Finally, uptake of 3H-OMG decreased after a 20-minute exposure to MgSO4 or NaF. In conclusion, uptake of 14C-BT and 3H-OMG by Caco-2 cells is differently modulated by distinct mineral waters.

A comparison of the Stroop Test to other tasks for studies of environmental stress.

1981 ◽  
Author(s):  
Mary M. Harbeson ◽  
Robert S. Kennedy ◽  
Alvah C. Bittner
Keyword(s):  
Environmental Stress ◽  
Stroop Test

Environmental stress and schizophrenia

1967 ◽  
Author(s):  
August B. Hollingshead
Keyword(s):  
Environmental Stress

Polysulfide-borohydride modification of southern pine alkaline pulping integrated with hydrothermal pre-extraction of hemicelluloses

TAPPI Journal ◽  
2011 ◽  
Vol 10 (7) ◽  
pp. 9-16
Author(s):  
SUNG-HOON YOON ◽  
HARRY CULLINAN ◽  
GOPAL A. KRISHNAGOPALAN
Keyword(s):  
Loblolly Pine ◽  
Sodium Borohydride ◽  
Kraft Pulping ◽  
Hot Water ◽  
Pulp Yield ◽  
Paper Strength ◽  
Southern Pine ◽  
Two Stage ◽  
Simultaneous Treatment ◽  
Process Modification

We studied three process modifications to investigate their effects on the property and yield recovery capabilities of kraft pulping integrated with hemicellulose pre-extraction of southern pine. Loblolly pine chips were pre-extracted with hot water until the sugar extraction yield reached the targeted value of 10% and then subjected to conventional and modified kraft pulping. Modification included polysulfide pretreatment; polysulfide-sodium borohydride dual pretreatment, and polysulfide followed by polysulfide-sodium borohydride dual pretreatment two-stage pretreatments prior to kraft pulping. In the first modification, about 5% of the lost pulp yield (total 7%) caused by hemicellulose pre-extraction could be recovered with 15%-20% polysulfide pretreatment. Complete recovery (7%) was achieved with simultaneous pretreatment using 15% polysulfide and 0.5% sodium borohydride with 0.1% anthraquinone in polysulfide-sodium borohydride dual pretreatment. Two-stage pretreatment using recycled 15% polysulfide followed by simultaneous treatment of 6% polysulfide and 0.4%–0.5% sodium borohydride with 0.1% anthraquinone also achieved 100% yield recovery. Continuous recycling of 15% polysulfide employed in the two-stage process modification maintained its yield protection efficiency in a repeated recycling cycle. No significant changes in paper strength were found in handsheets prepared from the three process modifications, except for a minor reduction in tear strength.

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