scholarly journals Comparative evaluation of vessel elements in S alix spp. (Salicaceae) endemic to the Athabasca sand dunes of northern Saskatchewan, Canada

2001 ◽  
Vol 88 (4) ◽  
pp. 583-587 ◽  
Author(s):  
Ranessa L. Cooper ◽  
David D. Cass
Keyword(s):  
Comparative Evaluation ◽  
Sand Dunes ◽  
Vessel Elements ◽  
Northern Saskatchewan

Leaf thickness of Salix spp. (Salicaceae) from the Athabasca sand dunes of northern Saskatchewan, Canada

2004 ◽  
Vol 82 (11) ◽  
pp. 1682-1686 ◽  
Author(s):  
R L Cooper ◽  
J V Ware ◽  
D D Cass
Keyword(s):  
Light Microscopy ◽  
Sand Dunes ◽  
Leaf Thickness ◽  
Data Comparison ◽  
Northern Saskatchewan ◽  
Salix Planifolia ◽  
Salix Spp

Leaf thicknesses of Salix taxa (Salix brachycarpa Nutt. var. psammophila Raup, Salix planifolia Pursh subsp. tyrrellii (Raup) Argus, Salix silicicola Raup, and Salix turnorii Raup) from the Athabasca sand dunes in northern Saskatchewan, Canada, were evaluated and compared with those of their respective widespread progenitors (S. brachycarpa Nutt. var. brachycarpa, S. planifolia Pursh subsp. planifolia, Salix alaxensis (Anders.), and Salix eriocephala Michx. var. famelica (C. R. Ball) Dorn). Leaf thickness was measured using standard light microscopy, and results were compared with the occurrence of amphistomaty in these Salix species. Leaf thickness values varied among the species and differed significantly within each derivative–progenitor Salix pair. The two amphistomatic taxa from Yakow Lake dunes, S. turnorii and S. planifolia subsp. tyrrellii, had significantly thicker leaves (337.65 ± 5.99 µm and 226.00 ± 5.22 µm, respectively) than their widespread progenitors, as well as the thickest leaves overall. The data comparison indicates a relationship between amphistomaty and leaf thickness among the Salix taxa, as thicker leaves tend to be amphistomatic.Key words: amphistomaty, Athabasca sand dunes, leaf thickness, Salix, willow.

Comparison of In-the-Ear and Over-the-Ear Hearing Aid Fittings

1986 ◽  
Vol 51 (4) ◽  
pp. 362-369 ◽  
Author(s):  
Donna M. Risberg ◽  
Robyn M. Cox
Keyword(s):  
Hearing Aids ◽  
High Frequency ◽  
Comparative Evaluation ◽  
Speech Intelligibility ◽  
Hearing Aid ◽  
Hearing Aid Fitting ◽  
The Difference ◽  
Functional Gain ◽  
The Relationship

A custom in-the-ear (ITE) hearing aid fitting was compared to two over-the-ear (OTE) hearing aid fittings for each of 9 subjects with mild to moderately severe hearing losses. Speech intelligibility via the three instruments was compared using the Speech Intelligibility Rating (SIR) test. The relationship between functional gain and coupler gain was compared for the ITE and the higher rated OTE instruments. The difference in input received at the microphone locations of the two types of hearing aids was measured for 10 different subjects and compared to the functional gain data. It was concluded that (a) for persons with mild to moderately severe hearing losses, appropriately adjusted custom ITE fittings typically yield speech intelligibility that is equal to the better OTE fitting identified in a comparative evaluation; and (b) gain prescriptions for ITE hearing aids should be adjusted to account for the high-frequency emphasis associated with in-the-concha microphone placement.

Diversity in the vessel elements of Ranunculaceae-Paeoniaceae complex

1981 ◽  
Vol 92 (5-6) ◽  
pp. 397-411
Author(s):  
Sr. Avita ◽  
J. A. Inamdar
Keyword(s):  
Vessel Elements
Sign in / Sign up

Export Citation Format

Share Document