Now showing items 11-20 of 138
The protective role of the peritrophic membrane in the tannin-tolerant larvae of Orgyia leucostigma (Lepidoptera)
(Elsevier, 1992-12)
Tannic acid had no detrimental effect on the growth rates or digestion efficiencies of Orgyia leucostigma larvae. We examined three potential mechanisms which might allow these larvae to tolerate ingested tannic acid. (1) ...
Resistance and resilience in a directly regenerating rainforest: Nicaraguan trees of the Vochysiaceae after Hurricane Joan
(Elsevier, 1994-10)
Two trees of the family Vochysiaceae, Vochysia ferruginea and Qualea paraensis, were abundant in a Nicaraguan rainforest which was heavily damaged by Hurricane Joan in 1988, and both had recovered their previous densities ...
Mitochondrial gene variation in Mercenaria clam sibling species reveals a relict secondary contact zone in the western Gulf of Mexico
(Springer-Verlag, 1996-10)
We investigated phylogeographic relationships among American Mercenaria taxa by assessing variation in a 444 nucleotide fragment of the mitochondrial 16S ribosomal gene in clams sampled from four representative sites in ...
Determinants of diet quality: the effects of diet pH, buffer concentration and buffering capacity on growth and food utilization by larvae of Manduca sexta (Lepidoptera: Sphingidae)
(Elsevier, 1993-01)
The growth of fourth-instar Manduca sexta larvae on nutrient-rich artificial diets is significantly affected by the characteristics of the buffer system present in the diet. An increase in diet buffer concentration or ...
Responses of Cambarid Crayfish to Predator Odor
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1998-11)
The responses of individuals of four sympatric species of cambarid crayfish to the introduction of the odor of a common predator, the snapping turtle Chelydra serpentina , were recorded in the laboratory. Adult Orconectes ...
Chemical permeabilization and in situ removal of daidzein from biologically viable soybean (Glycine max) seeds
(Kluwer Academic Publishers; Chapman and Hall ; Springer Science+Business Media, 1998-09)
After 24 h of chemical permeabilization with 20% (v/v) methanol at 25 °C, the amount of daidzein released from soybean seeds is 15 to 20% of the amount (0.0423 ± 0.0045 mg/g seed dry wt) obtained by physical grinding. With ...
Formation of insoluble and colloidally dispersed tannic acid complexes in the midgut fluid of Manduca sexta (Lepidoptera: Sphingidae): An explanation for the failure of tannic acid to cross the peritrophic envelopes of lepidopteran larvae
(John Wiley & Sons, Inc., 1998)
Magnesium and calcium ions, in concentrations comparable to those reported in the midgut fluids of lepidopteran larvae, bring about the precipitation of most of the tannic acid present in simple solutions buffered at pH ...
Species as historical individuals
(Kluwer Academic Publishers; Springer Science+Business Media, 1990-10)
The species category is defined as the smallest historical individual within which there is a parental pattern of ancestry and descent. The use of historical individual in this definition is consistent with the prevailing ...
Nitrate deposition in northern hardwood forests and the nitrogen metabolism of Acer saccharum marsh
(Springer-Verlag, 1996-10)
It is generally assumed that plant assimilation constitutes the major sink for anthropogenic Nitrate NO 3 − deposited in temperate forests because plant growth is usually limited by nitrogen (N) availability. Nevertheless, ...
Tannin sensitivity in larvae of Malacosoma disstria (Lepidoptera): Roles of the peritrophic envelope and midgut oxidation
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1994-08)
Final-instar Malacosoma disstria fed artificial diets containing tannic acid develop lethal pupal deformities. We examined some of the factors potentially underlying tannin sensitivity in this species, including the ...