scholarly journals The biology of Canadian weeds. 131. Polygonum aviculare L.

2005 ◽  
Vol 85 (2) ◽  
pp. 481-506 ◽  
Author(s):  
Mihai Costea ◽  
François J. Tardif
Keyword(s):  
Phenotypic Plasticity ◽  
North America ◽  
Environmental Factors ◽  
Genetic Variability ◽  
Key Words ◽  
Personal Data ◽  
Biological Information ◽  
Cultivated Plants ◽  
Polygonum Aviculare ◽  
Genetic And Environmental Factors

A review and assessment of biological information as well as personal data are provided for Polygonum aviculare in Canada. The species has been revised taxonomically and the six subspecies that occur in Canada are presented. Three of the subspecies, P. aviculare subsp. aviculare, P. aviculare subsp. neglectum and P. aviculare subsp. depressum are weeds introduced to Canada from Europe. A fourth subspecies, P. aviculare subsp. buxiforme is apparently native to North America. The geographical distribution of the latter four subspecies is very wide. Plants exhibit a high phenotypic plasticity and genetic variability, and they easily adapt to a multitude of agrestal and ruderal habitats. The seeds have a variable dormancy and polymorphic germination as a result of heterocarpy, genetic and environmental factors. In other areas (Europe), the species has developed resistance to triazines. Plants are hosts to nematodes, viruses, and fungi that also affect cultivated plants. Key words: POLAV, ecology, distribution, taxonomy

The biology of Canadian weeds. 126. Amaranthus albus L., A. blitoides S. Watson and A. blitum L.

2003 ◽  
Vol 83 (4) ◽  
pp. 1039-1066 ◽  
Author(s):  
M. Costea and F. J. Tardif
Keyword(s):  
Key Words ◽  
Herbicide Resistance ◽  
North Africa ◽  
Acetolactate Synthase ◽  
Biological Information ◽  
Cultivated Plants ◽  
Multiple Resistance ◽  
Weed Biology ◽  
The Past ◽  
Bacteria And Fungi

A review of biological information is provided for three species of the genus Amaranthus: A. albus L., A. blitoides S. Watson and A. blitum L. The last species has been revised taxonomically and a new subspecies for Canada is presented-A. blitum subsp. emarginatus (Moq. ex Uline & Bray) Carretero, Munoz Garmendia & Pedrol. Amaranthus albus and A. blitoides are native to the U.S.A. and introduced to Canada. Both species are annual ruderal and agrestal weeds. During the past 100 yr the two species have spread across most provinces of Canada, but the greatest frequency and abundance have been recorded in Saskatchewan. Originating from Europe, Asia and North Africa, A. blitum was initially considered a non-persistent species. The present study shows that A. blitum especially, subsp. emarginatus, has continued to spread in Québec. The three species are alternate hosts to many insects, nematodes, viruses, bacteria and fungi that affect cultivated plants. In other areas (U.S.A., Europe and Asia), the three species have developed multiple resistance to triazine and acetolactate-synthase-inhibiting herbicides. Key words: Amaranthus albus, Amaranthus blitoides, Amaranthus blitum, weed biology, ecology, taxonomy, herbicide resistance

The biology of Canadian weeds. 130. Amaranthus retroflexus L., A. powellii S. Watson and A. hybridus L.

2004 ◽  
Vol 84 (2) ◽  
pp. 631-668 ◽  
Author(s):  
M. Costea ◽  
S. E. Weaver ◽  
F. J. Tardif
Keyword(s):  
Acetolactate Synthase ◽  
Amaranthus Retroflexus ◽  
Biological Information ◽  
Cultivated Plants ◽  
Amaranthus Hybridus ◽  
Weed Biology ◽  
Genetic And Environmental Factors ◽  
Viable Seeds ◽  
Bacteria And Fungi ◽  
Persistent Seed Bank

A review of the biological information published after 1980 is provided for three species of the genus Amaranthus: A. retroflexus L., A. powellii S. Watson and A. hybridus L. The three species are noxious weeds introduced to Canada from southern North America. Their geographical distribution has remained almost unchanged since the original paper published in 1980. The plants exhibit a high phenotypic plasticity and genetic variability and they easily adapt to a multitude of agrestal and ruderal habitats. The seeds contribute to a persistent seed bank; they exhibit a variable dormancy and polymorph germination as a result of maternal, genetic and environmental factors. Growth is rapid and plants produce a large number of viable seeds. The three species have developed multiple resistance to triazine and acetolactate-synthase-inhibiting herbicides. They are alternate hosts to many insects, nematodes, viruses, bacteria and fungi that affect cultivated plants. Key words: Amaranthus retroflexus, Amaranthus powellii, Amaranthus hybridus, weed biology, ecology, taxonomy, herbicide resistance

scholarly journals Relationship between dermatoglyphics and cleft lip and/or palate: a review of literature

2017 ◽  
Vol 21 (2) ◽  
pp. 20-25
Author(s):  
Cristian Díaz ◽  
Habib Barhoum
Keyword(s):  
Environmental Factors ◽  
Cleft Palate ◽  
Key Words ◽  
Cleft Lip ◽  
Cleft Lip And Palate ◽  
Embryonic Tissue ◽  
Review Of Literature ◽  
Orofacial Clefts ◽  
Genetic And Environmental Factors ◽  
Period Of Gestation

This article reviews the concepts associated with dermatoglyphs such as their classification, characteristics and applications. It also reviews orofacial clefts such as cleft lip and palate and proposes a possible relationship between dermatoglyphics and these orofacial clefts, entities that are considered isolated at first, but considering that they are derived from the same embryonic tissue, the ectoderm, and their development is in the same period of gestation, making genetic and environmental factors that would influence the development of the asyndromic lip and / or palate could be reflected in the fingerprints and the type of pattern that they follow. Key words: Cleft lip, dermatoglyphics, cleft palate, fingerprint.

Reductionist thinking and animal models in neuropsychiatric research

2019 ◽  
Vol 42 ◽  
Author(s):  
Nicole M. Baran
Keyword(s):  
Animal Models ◽  
Mental Disorders ◽  
Environmental Factors ◽  
Neuropsychiatric Disorders ◽  
Model Organisms ◽  
Developmental Genetic ◽  
Term Study ◽  
Genetic And Environmental Factors ◽  
Mechanisms Of Plasticity

AbstractReductionist thinking in neuroscience is manifest in the widespread use of animal models of neuropsychiatric disorders. Broader investigations of diverse behaviors in non-model organisms and longer-term study of the mechanisms of plasticity will yield fundamental insights into the neurobiological, developmental, genetic, and environmental factors contributing to the “massively multifactorial system networks” which go awry in mental disorders.

The Association Between Chronic Disease and Psychological Distress: An Australian Twin Study

2020 ◽  
Vol 23 (6) ◽  
pp. 322-329
Author(s):  
Jessica Tyler ◽  
Janine Lam ◽  
Katrina Scurrah ◽  
Gillian Dite
Keyword(s):  
Psychological Distress ◽  
Chronic Disease ◽  
Environmental Factors ◽  
Twin Study ◽  
Disease Status ◽  
Adult Health ◽  
Linear Regression Models ◽  
Cross Sectional ◽  
Genetic And Environmental Factors ◽  
Distress Scale

AbstractThere is a commonly observed association between chronic disease and psychological distress, but many potential factors could confound this association. This study investigated the association using a powerful twin study design that can control for unmeasured confounders that are shared between twins, including genetic and environmental factors. We used twin-paired cross-sectional data from the Adult Health and Lifestyle Questionnaire collected by Twins Research Australia from 2014 to 2017. Linear regression models fitted using maximum likelihood estimations (MLE) were used to test the association between self-reported chronic disease status and psychological distress, measured by the Kessler Psychological Distress Scale (K6). When comparing between twin pairs, having any chronic disease was associated with a 1.29 increase in K6 (95% CI: 0.91, 1.66; p < .001). When comparing twins within a pair, having any chronic disease was associated with a 0.36 increase in K6 (95% CI: 0.002, 0.71; p = .049). This within-pair estimate is of most interest as comparing twins within a pair naturally controls for shared factors such as genes, age and shared lived experiences. Whereas the between-pair estimate does not. The weaker effect found within pairs tells us that genetic and environmental factors shared between twins confounds the relationship between chronic disease and psychological distress. This suggests that associations found in unrelated samples may show exaggerated estimates.

scholarly journals Association of a dysbiotic oral microbiota with the development of focal lymphocytic sialadenitis in IκB-ζ-deficient mice

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Junho Lee ◽  
Jehan Alam ◽  
Eunji Choi ◽  
Yeon Kyeong Ko ◽  
Ahreum Lee ◽  
...  
Keyword(s):  
Salivary Gland ◽  
Environmental Factors ◽  
Flow Rate ◽  
Therapeutic Target ◽  
Salivary Flow ◽  
Oral Microbiota ◽  
Disease Phenotype ◽  
Female Mice ◽  
Genetic And Environmental Factors ◽  
Deficient Mice

Abstract Mice lacking IκB-ζ, a protein encoded by the Nfkbiz gene, spontaneously develop a Sjögren’s syndrome-like disease involving the lachrymal glands, but no salivary gland symptoms have been reported. We found that Nfkbiz−/− female mice presented a significantly reduced salivary flow rate, focal lymphocytic sialadenitis (FLS), and a dysbiotic oral microbiota at week 24. To dissect the contributions of genetic and environmental factors to the salivary gland phenotype, Nfkbiz+/+ and Nfkbiz−/− mice were cohoused after weaning and evaluated at week 20. Cohousing alleviated the salivary gland phenotype of Nfkbiz−/− mice but did not induce any disease phenotype in Nfkbiz+/+ mice. Additionally, the oral microbiota in the cohoused mice was synchronized toward that in Nfkbiz+/+ mice. In conclusion, IκB-ζ-deficient mice developed hyposalivation and FLS, in which a dysbiotic oral microbiota played an important role. This finding suggests that the dysbiotic oral microbiota could be a therapeutic target.

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