Mating system and distribution of enzyme genetic variation in bracken (Pteridium aquilinum)

1995 ◽  
Vol 73 (10) ◽  
pp. 1611-1617 ◽  
Author(s):  
Helena Korpelainen
Keyword(s):  
Genetic Variation ◽  
Gene Flow ◽  
Mating Systems ◽  
Vegetative Reproduction ◽  
Mean Value ◽  
Pteridium Aquilinum ◽  
History Of ◽  
The Mean ◽  
Allozyme Study ◽  
Growth And Reproduction

An allozyme study of populations of bracken, Pteridium aquilinum, revealed very low rates of intragametophytic selfing, on average 0.046, despite potential hermaphroditism and selfing of the gametophytes. The average number of genotypes per population was only 3.0 and mean heterozygosity equalled 0.015. Several populations consisted of only one genotype. The level of genetic divergence among populations was considerable. The mean value of the differentiation among populations (FST) was high (0.307) and the gene flow values were low, equalling 0.52 and 0.23 depending on the method of estimation. It is suggested that the life history of P. aquilinum, characterized by variable rates of spore production, vegetative reproduction, and the inefficiency of gametophyte growth and reproduction in established bracken stands, promotes genetic differentiation between populations. Key words: bracken, Pteridophyta, genetic variation, gene flow, mating systems.

Nasal mucociliary clearance in patients with diabetes mellitus

1989 ◽  
Vol 103 (9) ◽  
pp. 853-855 ◽  
Author(s):  
W. L. Yue
Keyword(s):  
Diabetes Mellitus ◽  
Mucociliary Clearance ◽  
Mean Value ◽  
Nasal Disease ◽  
Patients With Diabetes ◽  
History Of ◽  
Insulin Dependent ◽  
Mucociliary Function ◽  
The Mean ◽  
Nasal Mucociliary Clearance

AbstractFifty insulin-dependent diabetics and 50 non-diabetics without a history of nasal disease have been studied for nasal problems including mucociliary function complicated by diabetes mellitus. For the diabetics, the mean value of nasal mucociliary clearance was considerably decreased and this was more often associated with dry noses but increased pH-values, both of which were higher than those for non-diabetics (p<0.05). As suggested in earlier literature, more aggressive nasal moistening therapy must be recommended for those patients presenting with these conditions in the light of systemic diabetic abnormalities.

Conservation genetics and ecology of the endangered rainforest shrub, Triunia robusta, from the Sunshine Coast, Australia

2002 ◽  
Vol 50 (1) ◽  
pp. 93 ◽  
Author(s):  
Alison Shapcott
Keyword(s):  
Genetic Diversity ◽  
Genetic Variation ◽  
Gene Flow ◽  
Conservation Genetics ◽  
Population Size ◽  
Genetic Similarity ◽  
Small Region ◽  
Geographic Proximity ◽  
Close Proximity ◽  
The Mean

Triunia robusta, which until recently was thought to be extinct, is now classified nationally as endangered. It is an understorey species restricted to the subcoastal rainforests in a small region of the Sunshine Coast, Queensland. The project involved sampling the genetic variation and measuring the population size and size distribution of T. robusta and its geographically closest congener T. youngiana, which occurs further south and has a wider geographic distribution. A total of 877 T. robusta plants were recorded across the 11 populations, approximately half (56.8&percnt;) of these were juveniles less than 1 m tall, whereas in T. youngiana only about 36.4&percnt; of a population was composed of juveniles. Genetic diversity was similar but significantly higher for T. robusta than T. youngiana if the very small T. robusta populations (2 or 3 plants) were excluded from analysis (P &lt; 0.05). The mean percentage of polymorphic loci among populations was high for both species. Triunia robusta is not, on average, more inbred than the more common T. youngiana. There was more differentiation between the T. robusta populations, which were in close proximity, than between the more geographically separated T. youngiana populations. Thus, there is evidence of more gene flow between populations of T. youngiana than between those of T. robusta. However, there was no geographic relationship between genetic similarity and geographic proximity in T. robusta

scholarly journals On the Binarity of the F0p Magnetic Stars ϒ Equ and 49 Cam

1999 ◽  
Vol 170 ◽  
pp. 331-334 ◽  
Author(s):  
D.E. Mkrtichian ◽  
N.N. Samus ◽  
N.A. Gorynya ◽  
P. North ◽  
A.P. Hatzes
Keyword(s):  
Binary Star ◽  
Mean Value ◽  
High Eccentricity ◽  
Long Period ◽  
Field Investigations ◽  
Magnetic Stars ◽  
History Of ◽  
The Mean ◽  
Binary Orbit ◽  
The Magnetic Field

The magnetic field investigations of the rapidly-oscillating (ro)Ap star ϒ Equ show a very long magnetic (rotational) period of about 74 years (Leroy et al. 1994; Bychkov & Shtol 1997). No significant changes of radial velocities were detected during the history of investigations of this star. Recently, Scholz et al. (1997) (hereafter S97) reported a rapid increase of radial velocity (RV) of ϒ Equ from the mean value of -16.81 km s−1 up to a maximum at -4.28 km s−1 within the interval JD 2449608 – JD 2450356, and suggested that ϒ Equ is a long-period binary star with high eccentricity. Such a probable discovery of binary motion of ϒ Equ is very interesting, since it opens the possibility to compare asteroseismic parameters of the star with those obtained from the binary orbit.

EVALUASI REPRODUKSI INDUK SAPI POTONG LIMOSIN DENGAN SISTEM PERKAWINAN INSEMINASI BUATAN (STUDI LAPANG DI KELURAHAN KLAMPOK KECAMATAN SANANWETAN KOTA BLITAR

2021 ◽  
Vol 14 (1) ◽  
pp. 11-20
Author(s):  
Muhammad Hamzah ◽  
Nita opi Ari kustanti ◽  
Risma Novela Esti
Keyword(s):  
Beef Cattle ◽  
Artificial Insemination ◽  
Mating Systems ◽  
Mean Value ◽  
Calving Interval ◽  
Service Value ◽  
Average Value ◽  
The Mean ◽  
Days Open ◽  
The Average Range

The aim of this study was to determine reproductive evaluation of Limosin beef cattle by using artificial insemination mating systems located in Klampok Village, Sananwetan District, Blitar City. The results of the study, mean service value per conception (SC) which has a result of 1.55. The mean conception rate (CR) score was 55.5%. The average value of Days Open (DO) has a yield of 123.5 days. The mean value of the Calving Interval (CI) is 372.5 days. The conclusion of this study is the evaluation of the reproduction of Limosin beef cattle using the artificial insemination mating system in Klampok Village, Sananwetan District, Blitar City produces good values ​​including the Value of Service per Conception (S / C), Days Open (DO), Clving Interval (CI) while Conception speed value is still low below the average range.

scholarly journals Low genetic divergence and variation in coastal dune populations of the widespread terrestrial orchid Epipactis helleborine

2020 ◽  
Vol 193 (3) ◽  
pp. 419-430 ◽  
Author(s):  
Hans Jacquemyn ◽  
Hanne De Kort ◽  
An Vanden Broeck ◽  
Rein Brys
Keyword(s):  
Genetic Variation ◽  
Gene Flow ◽  
Genetic Differentiation ◽  
Genetic Divergence ◽  
Coastal Dune ◽  
Terrestrial Orchid ◽  
Colonization Event ◽  
History Of ◽  
Epipactis Helleborine ◽  
Seed Introduction

Abstract Reconstructing the early history of species divergence and quantifying the level of standing genetic variation in diverging populations are central to our understanding of ecotype formation and ultimately speciation. In this study, we used single nucleotide polymorphisms to reconstruct the evolutionary history of species divergence in coastal dune populations of the widespread terrestrial orchid Epipactis helleborine and to investigate the level of standing genetic variation in 29 coastal dune populations in a fragmented dune landscape along the Belgian and French coast. Additionally, we used seed introduction experiments to assess the potential for gene flow into existing populations after long-distance seed dispersal and the ability to colonize vacant sites. Our results showed that coastal dune populations diverged only recently from inland populations, went through a significant bottleneck and were most probably the result of a single colonization event. Current levels of population genetic diversity are low and not related to population size or spatial isolation. The sampled dune populations also showed little genetic differentiation, and no apparent spatial genetic structure was observed. Seed introduction experiments showed that seeds of coastal dune populations germinated easily in both occupied and unoccupied sites in dune habitat, indicating that the availability of suitable mycorrhizal fungi is not limiting the distribution of coastal dune populations and that gene flow through seeds has probably contributed to the observed low levels of genetic differentiation. Overall, these results are consistent with a process of genetic divergence after a single, recent colonization event, followed by extensive gene flow among populations.

scholarly journals Relationship between atopic manifestations, family history of atopic disease and cord blood IgE levels in children

2007 ◽  
Vol 47 (6) ◽  
pp. 278
Author(s):  
Tisnasari Hafsah ◽  
Myrna Soepriadi ◽  
Budi Setiabudiawan ◽  
Herry Garna
Keyword(s):  
Family History ◽  
Cord Blood ◽  
Atopic Disease ◽  
Mean Value ◽  
Inclusion Criteria ◽  
Chi Square ◽  
The Past ◽  
History Of ◽  
The Mean ◽  
The Relationship

Background The incidence of atopic disease tends to increaseover the past few decades and its morbidity interferes with thequality of life and health. Prediction of the disease is importantfor early prevention.Objective To evaluate the relationship between atopicmanifestations, family history (FH) of atopic disease and cordblood IgE (CB-IgE) levels.Methods We conducted an analytic observational study withcohort retrospective design on children with an average age of 3years whose CB-IgE had been measured at delivery inKiaracondong Primary Health Care during October–December2004. Manifestations of atopic disease were recorded using ISAACquestionaire for allergy. Chi-square, Mann-Whitney test, andlogistic regression analysis were used for analysis.Results Cord blood IgE was measured on 124 children after birth.Only 94 children (76%) fulfilled the inclusion criteria. Atopicdisease was found in 17 children (18%), consisting of 8 childrenwith atopic dermatitis, 4 with allergic rhinitis, and 5 suffered fromboth. There were significant differences in the mean value of CB-IgE (Z M-W =4.60; P<0.001) and FH (x 2 =19.059; P<0.001)between atopic and non atopic children. Cut off point of the CB-IgE concentration was 1.4 IU/mL (77.7%). The highest probabilityfor atopic manifestations was found in children who had highCB-IgE and positive FH (P=45%). Relative risk of children withhigh CB-IgE level in positive FH group was 3.636 (95% CI0.943;14.016).Conclusion CB-IgE level and family history of atopic disease arerisk factors for the development of atopic manifestation.

The systematic status of the lagoon periwinkle, Littorina tenebrosa

1999 ◽  
Vol 79 (4) ◽  
pp. 653-660 ◽  
Author(s):  
Iain F. Wilson ◽  
Elizabeth M. Gosling ◽  
William Tapper
Keyword(s):  
Phylogenetic Analysis ◽  
Genetic Variation ◽  
Gene Flow ◽  
Genetic Distance ◽  
Gel Electrophoresis ◽  
Distinct Group ◽  
Starch Gel Electrophoresis ◽  
Allopatric Populations ◽  
Starch Gel ◽  
The Mean

Eight samples of Littorina tenebrosa and L. saxatilis (Mollusca: Gastropoda) from Ireland and Britain, including pairs of each form from two locations in Ireland, were screened for genetic variation at 12 polymorphic enzyme loci using starch gel electrophoresis. Levels of polymorphism and heterozygosity were similar in L. tenebrosa and L. saxatilis, apart from a sample of L. tenebrosa from Britain which was less polymorphic than the Irish samples. No alleles were found to be unique to either form. Phylogenetic analysis using UPGMA showed that L. saxatilis and L. tenebrosa populations clustered as a monophyletic group. Nevertheless, the mean genetic distance between parapatric populations of L. saxatilis and L. tenebrosa (D=0.076) was similar to the mean for allopatric populations of either species (D=0.080). This indicates that there is a barrier to gene flow between the two forms Despite this, L. tenebrosa does not merit specific status since populations of this snail do not cluster as a distinct group, separate from L. saxatilis populations.

scholarly journals A preliminary study of the allozyme variation in the grey hamster, Cricetulus migratorius (Mammalia: Rodentia), from the Asian part of Turkey

2011 ◽  
Vol 63 (2) ◽  
pp. 381-391 ◽  
Author(s):  
Osman İbiş ◽  
Coşkun Tez ◽  
Servet Özcan ◽  
Metin Kiliç ◽  
Murat Telcioğlu
Keyword(s):  
Genetic Variation ◽  
Gene Flow ◽  
Gel Electrophoresis ◽  
Allozyme Variation ◽  
Genetic Distances ◽  
Average Value ◽  
Enzyme Systems ◽  
The Mean ◽  
Preliminary Study ◽  
Allozyme Loci

The aim of the present study was to evaluate the degree of genetic variation and divergence by cellulose acetate gel electrophoresis between samples of Cricetulus migratorius, a cricetine rodent distributed in the Asian part (Anatolia) of Turkey. Out of twenty allozyme loci scored for fifteen enzyme systems, eleven loci were detected to be polymorphic in at least one locality of the Turkish C. migratorius. Indices of genetic variability (the percentage of polymorphic loci, mean number of alleles per locus, and mean observed and expected heterozygosities) were found to be P(95%) = 28, A = 1.3, Ho = 0.226 and He = 0.218, respectively. Nei?s unbiased genetic distances ranged from 0.000 to 0.153, with an average value of 0.069. The mean gene flow was calculated to be Nm = 0.7484. This is a preliminary study describing the allozymic variations of C. migratorius from Turkey. As there are no extensive data on the allozymic variations of C. migratorius from other regions, our results could not be compared, in detail with those of other populations of the species C. migratorius.

scholarly journals Genetic diversity and biogeographic history inform future conservation management strategies for the rare sunset frog (Spicospina flammocaerulea)

2011 ◽  
Vol 59 (2) ◽  
pp. 63 ◽  
Author(s):  
D. L. Edwards ◽  
J. D. Roberts
Keyword(s):  
Genetic Variation ◽  
Gene Flow ◽  
Western Australia ◽  
Agricultural Landscape ◽  
Management Strategies ◽  
Population History ◽  
Conservation Strategy ◽  
Management Options ◽  
Biogeographic History ◽  
History Of

Outlining the distribution of genetic variation, patterns of gene flow and clarifying the biogeographic processes underlying population history are critical components of a comprehensive conservation strategy for endangered or vulnerable species. We provide this information for the vulnerable sunset frog (Spicospina flammocaerulea) using a comprehensive genetic dataset (ND2) with samples from 17 of 22 geographic localities where this species has been found. From genetic, biogeographic and coalescent-based analyses, we document the existing genetic variation, likely movement patterns and explore the biogeographic history of S. flammocaerulea. While catchment-based genetic variation is well documented in other high-rainfall taxa in south-western Australia, a much more complex scenario including dispersal across ridge lines between catchments better explains the distribution of genetic variation and observed patterns of gene flow in S. flammocaerulea. The population history of S. flammocaerulea is strongly indicative of recent population contraction and expansion, which may be related to late Pleistocene climate fluctuations. This suggests that this species can adapt or move in response to fluctuating climates provided suitable habitats or expansion areas are available. However, like many other endemic taxa with limited geographic ranges in south-western Australia, the potential to shift distributions is hampered by being land-locked within an agricultural landscape, limiting management options in the face of climate change.

scholarly journals Anti-annexin V Antibodies in Women with Recurrent Miscarriage

2010 ◽  
Vol 4 ◽  
pp. CMRH.S5835
Author(s):  
M.N. EL-Gharib ◽  
T.M. Elhawary ◽  
S.H. Elshourbagy ◽  
M.A. Morad
Keyword(s):  
Pregnant Women ◽  
Recurrent Miscarriage ◽  
Characteristic Curve ◽  
Annexin V ◽  
Mean Value ◽  
Control Group ◽  
Etiologic Factor ◽  
Group I ◽  
History Of ◽  
The Mean

Objective To determine the role of anti-annexin V antibodies (a-A5) as an etiologic factor in recurrent pregnancy failure. Study design Prospective observational study. Material and methods The study included ninety first trimester pregnant women who had a history of unexplained recurrent miscarriage (group I) with ninety well-matched pregnant women with a history of normal reproductive outcome allocated as control group (GII) and another ninety nonpregnant women (GIII). Sera from all women controls were analyzed for anti-annexin antibody measured by Elisa. Results The mean value of a-A5 was 11.37 ± 6.78, 7.7 ± 1.40 and 6.20 ± 0.95 ng/ml in groups I, II and III respectively. There was a significant increase in the mean value a-A5 among women with a history of recurrent miscarriage, compared with controls. The mean value was 13.92 ± 2.42 ng/ml among patients with unfavourable outcome, compared with a corresponding value of 6.95 V 0.58 ng/ml among women with favourable outcome. The receiver operator characteristic curve revealed that the cutoff value of a-A5 was 8.61 ng/ml. Conclusion This study emphasizes the relationship between anti-annexin V antibodies and recurrent miscarriage.

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