Fecundity and fitness in cross-compatible pollinations of tristylous North American Lythrum salicaria populations

2000 ◽  
Vol 101 (5-6) ◽  
pp. 830-843 ◽  
Author(s):  
N. O. Anderson ◽  
P. D. Ascher
Keyword(s):  
North American ◽  
Lythrum Salicaria ◽  
Compatible Pollinations

An experimental study of wetland invasibility by purple loosestrife (Lythrum salicaria)

2000 ◽  
Vol 77 (10) ◽  
pp. 1499-1503 ◽  
Author(s):  
J Rachich ◽  
R J Reader
Keyword(s):  
Experimental Study ◽  
North American ◽  
Seedling Establishment ◽  
Lythrum Salicaria ◽  
Purple Loosestrife ◽  
Reed Canary Grass ◽  
Plant Survival ◽  
Growing Seasons ◽  
Disturbed Areas ◽  
Canary Grass

We examined the effects of vegetation and herbivores on the seedling establishment, survival, and inflorescence mass of purple loosestrife (Lythrum salicaria L.), a Eurasian plant that invades North American wetlands. The study was conducted in a stand of reed canary grass (Phalaris arundinacea L.). All grass was removed experimentally from 1.2 × 1.2 m plots to simulate a disturbance. The establishment of sown seeds was compared in disturbed and undisturbed plots. Fifty-three percent of seeds became established in disturbed plots, while no seedlings became established in undisturbed plots, suggesting that disturbance is required for wetland invasion by L. salicaria. In plots without grass, the effect of herbivores on Lythrum's survival and inflorescence mass (i.e., sexual reproduction) was assessed by excluding herbivores from some plots but not from others. After two growing seasons, Lythrum's survival did not differ significantly between plots with herbivores excluded (100% plant survival) and plots with herbivores not excluded (60-80% plant survival). However, only plants protected from herbivores produced inflorescences. Mammals such as deer and rodents ate the shoot tips of unprotected plants, which prevented terminal inflorescences from being produced. These results only partly support the claim that North American herbivores are ineffective predators of L. salicaria. One mechanism underlying wetland invasion by L. salicaria is likely a combination of disturbance permitting seedling establishment and insufficient herbivory in disturbed areas to prevent newly established plants from surviving.

scholarly journals Detecting Cross-incompatibility of Three North American Apricot Cultivars and Establishing the First Incompatibility Group in Apricot

1996 ◽  
Vol 121 (6) ◽  
pp. 1002-1005 ◽  
Author(s):  
J. Egea ◽  
L. Burgos
Keyword(s):  
North American ◽  
Fruit Set ◽  
Common Ancestor ◽  
Prunus Armeniaca ◽  
Self Incompatibility ◽  
S Locus ◽  
Incompatibility Group ◽  
Breeding Programs ◽  
Multiple Alleles ◽  
Compatible Pollinations

Laboratory and orchard tests have shown that the apricot (Prunus armeniaca L.) cultivars `Hargrand', `Goldrich', and `Lambertin-1' are cross-incompatible. All three cultivars are from North American breeding programs and have `Perfection' as a common ancestor. In orchard tests, compatible pollinations resulted in 19% to 74% fruit set, while incompatible pollinations resulted in <2% fruit set. Microscopic examination showed that, in incompatible pollinations, pollen tube growth was arrested in the style, most frequently in its third quarter, and that the ovary was never reached. It is proposed that self-incompatibility in apricot is of the gametophytic type, controlled by one S-locus with multiple alleles, and that these three cultivars are S1S2.

Infection control in North American dental schools

1989 ◽  
Vol 53 (9) ◽  
pp. 532-537 ◽  
Author(s):  
E Sampson ◽  
VB Dhuru
Keyword(s):  
Infection Control ◽  
North American ◽  
Dental Schools

Treatment planning instruction in North American dental schools, 1984-85

1985 ◽  
Vol 49 (10) ◽  
pp. 702-706
Author(s):  
S Kennon ◽  
TF Sleamaker ◽  
AG Farman
Keyword(s):  
Treatment Planning ◽  
North American ◽  
Dental Schools

Adaptation of the Connected Speech Test: Rerecording and Passage Equivalency

2020 ◽  
Vol 29 (2) ◽  
pp. 259-264 ◽  
Author(s):  
Hasan K. Saleh ◽  
Paula Folkeard ◽  
Ewan Macpherson ◽  
Susan Scollie
Keyword(s):  
Speech Perception ◽  
North American ◽  
First Language ◽  
Intraclass Correlation ◽  
Normal Hearing ◽  
Connected Speech ◽  
Internal Reliability ◽  
Speech Test ◽  
The Mean ◽  
Unit Standard

Purpose The original Connected Speech Test (CST; Cox et al., 1987) is a well-regarded and often utilized speech perception test. The aim of this study was to develop a new version of the CST using a neutral North American accent and to assess the use of this updated CST on participants with normal hearing. Method A female English speaker was recruited to read the original CST passages, which were recorded as the new CST stimuli. A study was designed to assess the newly recorded CST passages' equivalence and conduct normalization. The study included 19 Western University students (11 females and eight males) with normal hearing and with English as a first language. Results Raw scores for the 48 tested passages were converted to rationalized arcsine units, and average passage scores more than 1 rationalized arcsine unit standard deviation from the mean were excluded. The internal reliability of the 32 remaining passages was assessed, and the two-way random effects intraclass correlation was .944. Conclusion The aim of our study was to create new CST stimuli with a more general North American accent in order to minimize accent effects on the speech perception scores. The study resulted in 32 passages of equivalent difficulty for listeners with normal hearing.

North American blastomycosis presenting as an acute panniculitis and arthritis

1970 ◽  
Vol 102 (1) ◽  
pp. 92-96 ◽  
Author(s):  
R. P. Maioriello
Keyword(s):  
North American

"TRACHOMA AMONG THE NORTH AMERICAN INDIANS"

JAMA ◽  
1926 ◽  
Vol 86 (13) ◽  
pp. 970
Author(s):  
L. Webster Fox
Keyword(s):  
American Indians ◽  
North American ◽  
North American Indians ◽  
The North

1588: The Bicalutamide Early Prostate Cancer Program: Findings of the North American Trial at 7.7 Years' Median Follow-Up

2006 ◽  
Vol 175 (4S) ◽  
pp. 511-512
Author(s):  
David G. McLeod ◽  
Ira Klimberg ◽  
Donald Gleason ◽  
Gerald Chodak ◽  
Thomas Morris ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
North American ◽  
Early Prostate Cancer ◽  
The North ◽  
Cancer Program

144: Surgical Margin Status in European Versus North American Patients at Radical Prostatectomy

2006 ◽  
Vol 175 (4S) ◽  
pp. 46-47
Author(s):  
Daniel J. Lewinshtein ◽  
K.-H. Felix Chun ◽  
Alberto Briganti ◽  
Hendrik Isbarn ◽  
Eike Currlin ◽  
...  
Keyword(s):  
Radical Prostatectomy ◽  
North American ◽  
Surgical Margin ◽  
Margin Status
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