Genetic and macromorphologic evidence bearing on the evolution of members of Carex section Vesicariae (Cyperaceae) and their natural hybrids

1993 ◽  
Vol 71 (3) ◽  
pp. 486-500 ◽  
Author(s):  
Bruce A. Ford ◽  
Peter W. Ball ◽  
Kermit Ritland
Keyword(s):  
Key Words ◽  
High Frequency ◽  
Genetic Distances ◽  
Natural Hybrids

A comparison of genetic distances between the short-beaked species (C. saxatilis, C. membranacea, and C. rotundata) and some long-beaked species (C. utriculata, C. rostrata, and C. vesicaria) of Carex section Vesicariae indicates that the short-beaked group is not monophyletic. Carex saxatilis is closely related to C. vesicaria, while C. membranacea and C. rotundata are related to C. utriculata. It is proposed that C. saxatilis is derived from a vesicaria-like ancestor, while C. membranacea and C. rotundata have evolved from a utriculata-like progenitor. Taxa identified as hybrids between various short- and long-beaked species are intermediate in morphology, heterozygous for diagnostic loci (which exhibited a high frequency of alternative alleles in the putative parents), and often sterile. On the basis of the evidence presented the following hybrids are recognized: C. × paludivagans (C. rotundata × utriculata); C. × stenolepis (incl. C. × grahamii, C. × mainensis, C. × anticostensis; C. saxatilis × vesicaria); C. × physocarpoides (C. saxatilis × utriculata); and C. membranacea × utriculata. Key words: Carex, evolution, hybridization, systematics, morphology, isozymes.

Features of obstetric and perinatal pathology at women with an undifferentiated dysplasia of connecting tissue

2017 ◽  
pp. 96-98
Author(s):  
A.L. Kostiuk ◽  
Keyword(s):  
Pregnant Women ◽  
Key Words ◽  
High Frequency ◽  
Clinical Laboratory ◽  
Perinatal Pathology

The objective: to study features of obstetric and perinitalny pathology at women with undifferentiated dysplasia of a connecting tissue. Patients and methods. 100 patients with clinical-laboratory signs of an undifferentiated dysplasia of connecting tissue are surveyed. On the basis of the received results of the patient were divided into two groups: the main – 50 women (expression of і6 points) whom regarded as patients with the expressed undifferentiated dysplasia of connecting tissue, and group of comparison – 50 women (expression <6 points) whom regarded as patients without the expressed undifferentiated dysplasia of connecting tissue. Results. Results of the conducted researches testify to the high frequency of obstetric and perinatal pathology at pregnant women with clinical-laboratory and functional signs of an undifferentiated dysplasia of connecting tissue. Conclusion. The received results are the basis for algorithm improvement the diagnostical and treatment-and-prophylactic actions at women with an undifferentiated dysplasia of connecting tissue. Key words: undifferentiated dysplasia of connecting tissue, obstetric and perinatal pathology.

Features of professional disease of women–medical workers

2017 ◽  
pp. 70-71
Author(s):  
A.S. Shelygin ◽  
Keyword(s):  
Key Words ◽  
Functional Assessment ◽  
High Frequency ◽  
Clinical Laboratory ◽  
State Of Health ◽  
Case Rate ◽  
Working Out ◽  
Doctors And Nurses

The objective: an assessment of a professional case rate of women–medical workers. Patients and methods. The complex clinical-laboratory and functional assessment of a state of health, including genesial, at 100 women of doctors of various specialties and at 100 women of average medical workers is carried out. Results. Results of the spent researches testifies to high frequency of professional disease of medical workers of a various link – doctors and nurses. Conclusion. The received results are necessary for considering by working out of algorithm of diagnostic and treatment-and-prophylactic actions. Key words: medical workers, professional disease.

Ascospore abortion in crosses of Cochliobolus heterostrophus heterozygous for the virulence locus Tox1

Genome ◽  
1988 ◽  
Vol 30 (1) ◽  
pp. 12-18 ◽  
Author(s):  
Charlotte R. Bronson
Keyword(s):  
Key Words ◽  
Reciprocal Translocation ◽  
High Frequency ◽  
Chromosome Rearrangement ◽  
Cochliobolus Heterostrophus ◽  
Bipolaris Maydis ◽  
Field Isolates

Crosses heterozygous for the virulence locus Tox1 show a high frequency of nonrandom ascospore abortion, in addition to a high frequency of random abortion seen in homozygous crosses. In crosses among closely related laboratory strains, the frequency of asci with eight mature, viable spores dropped from 35–47% of asci with mature spores in crosses homozygous for Tox1 to 3–17% in heterozygous crosses. Segregation for alternate alleles of Tox1 was 2:2 in 98% of asci with four viable spores. Patterns of abortion in crosses involving field isolates were similar to the patterns in crosses among laboratory strains. No recombinants between Tox1 and the abortion-inducing factor were detected among 112 progeny of laboratory strains. The results suggest that race T (TOX1) and race O (tox1) strains of C. heterostrophus differ by a chromosome rearrangement, possibly a reciprocal translocation, with a breakpoint at or near Tox1.Key words: fertility, T-toxin, Cochliobolus heterostrophus, Helminthosporium maydis, Bipolaris maydis, Drechslera maydis, chromosome rearrangement, reciprocal translocation.

scholarly journals Studies on High Frequency Shoot Regeneration in Sesame (Sesamum indicum L.)

2012 ◽  
Vol 21 (1) ◽  
pp. 45-52 ◽  
Author(s):  
Bangaramma S. Wadeyar ◽  
R. Lokesha
Keyword(s):  
Key Words ◽  
Shoot Regeneration ◽  
Plant Tissue ◽  
High Frequency ◽  
Sesamum Indicum ◽  
Direct Seeding ◽  
The Other ◽  
Seeding Method ◽  
Regeneration Response ◽  
High Sucrose

High frequency shoot regeneration was attempted in sesame (Sesamum indicum L. Pedaliaceae), using five genotypes/varieties viz. Tumkur and Gulbarga Locals (land races), W-II, E-8 and DS-1 (varieties). The hypocotyl-derived callus obtained through direct seeding method was placed on MS with five different treatments viz. pre-culture of callus on high sucrose (6 - 9%) for two weeks and transferring on to plain MS with 3% sucrose, MS with variable concentrations of TDZ alone, MS with constant TDZ and variable concentrations of BA and IAA, MS with variable concentrations of BA and IAA without TDZ, MS with ABA and AgNO3 and MS with BAP, NAA and AgNO3.  Highest frequency of cent per cent shoot regeneration was initiated in variety DS-1on MS containing NAA 2.5 mg/l, BAP 3.5 mg/l and 20 µM AgNO3 with 2.50 mean shoots/callus followed by 91.6% in variety W-II on MS containing 25 µM TDZ with 2.20 mean shoots/callus. The other treatments had poor shoot regeneration response. The results have been discussed in the light of sesame improvement through biotechnological ways.   Key words: Sesamum indicum, hypocotyl, high frequency,  shoot regeneration   D. O. I. 10.3329/ptcb.v21i1.9562   Plant Tissue Cult. & Biotech. 21(1): 45-52, 2011 (June)

The Research on Chinese Automatic Segmentation

2013 ◽  
Vol 798-799 ◽  
pp. 818-821
Author(s):  
Huan Qin Li ◽  
Shi Tao Yan
Keyword(s):  
Natural Language ◽  
Key Words ◽  
Statistical Method ◽  
High Frequency ◽  
Fundamental Problem ◽  
Automatic Segmentation ◽  
Abstract Word ◽  
Word Segmentation ◽  
Key Issues

Abstract. Word Segmentation is a fundamental problem of the Chinese natural language progressing. Based on the analysis of the state on research and key issues of it .The paper introduces a tree structure statistical method of word frequency, which enables key words to match one another highly-efficiently. by which we can rapidly express texts as the set of high-frequency words,so the classification of texts is conveniently reached.

The Key Concept of “Preparation” in K. K. Rokossovsky’s Memoir “Soldier’s Duty”

2021 ◽  
pp. 64-71
Author(s):  
Ma Ruye ◽  
Keyword(s):  
Key Words ◽  
High Frequency ◽  
Special Role ◽  
Evaluation Tool ◽  
High Importance ◽  
Dominant Component ◽  
Frequency Of Use ◽  
The World ◽  
Key Concepts

The defining feature of memoirs as a genre is the understanding of the events and the author’s own role in them. The world of the language personality of the author-narrator becomes the dominant component, which forms the meaning of the text. One of the possibilities of its linguistic study is to rely on key concepts, which are implemented by some lexical units, reflecting the worldview of the narrator and showing the conceptual and idiostylistic nature of the text. Studying military memoirs of Marshal Rokossovsky allowed to reveal a special role of the word preparation, which has a high frequency of use and is of a high importance as an evaluation tool. It may be considered one of the key words of the text because it refl ects one of the major areas of focus of Rokossovsky during the war. Thus, the meaning of the text in the genre of memoirs and personality of its creator can be interpreted by considering the important components in the activities of the author-narrator. One concept predominates the meaning of their work and becomes one of the key-concepts. From the perspective of this key concept the author evaluates events and their participants as positive or negative.

Knowledge Maps of Disaster Medicine in China Based on Co-Word Analysis

2018 ◽  
Vol 13 (03) ◽  
pp. 405-409
Author(s):  
Wei Wei ◽  
Jie Ge ◽  
Sha Xu ◽  
Ming Li ◽  
Zhe Zhao ◽  
...  
Keyword(s):  
Key Words ◽  
High Frequency ◽  
Disaster Medicine ◽  
Research Field ◽  
Journal Articles ◽  
Knowledge Maps ◽  
Word Analysis ◽  
Treatment Techniques ◽  
Research Themes ◽  
Diagram Analysis

AbstractObjectiveWe analyzed research themes in the field of disaster medicine in China to provide references for researchers to understand the research status and developing trends of this field.MethodsPublished journal articles were retrieved. A social network analysis was conducted to visualize the relations of high-frequency key words. A cluster analysis was used to classify key words. A strategic diagram analysis was conducted to visualize clusters across the entire research field.ResultsWe retrieved 3,079 articles, from which 1,749 articles and 8,284 key words were identified after screening. High-frequency key words were classified into 6 clusters. “Medical rescue” had the highest degree and betweenness centralities. Cluster 4 was located in Quadrant I of the strategic diagrams.Conclusions“Medical rescue” is the core key word, and it serves a pivotal “bridge” function. “Emergencies” and similar terms are key words with special statuses. “Natural disaster medical rescue” and “fundamental theories of disaster medicine” constitute the primary and secondary core themes, respectively. “On-site emergency treatment techniques” is a marginalized theme. The other themes are emerging themes that offer considerable scope for future development. Generally, the scope and depth of investigations in this field should be improved. (Disaster Med Public Health Preparedness. 2019;13:405-409)

scholarly journals Complete mitochondrial genome sequences of rare haplotype E4 from Phu Quoc ridgeback dog

2018 ◽  
Vol 15 (1) ◽  
pp. 45-54
Author(s):  
Trần Hoàng Dũng ◽  
Trương Nguyễn Thị Như Mai ◽  
Nguyễn Thành Công ◽  
Huỳnh Văn Hiếu
Keyword(s):  
Mitochondrial Genome ◽  
Phylogenetic Tree ◽  
High Frequency ◽  
Complete Mitochondrial Genome ◽  
Genetic Distances ◽  
Genome Sequences ◽  
Rare Haplotype ◽  
Unexpected Event ◽  
Number Of Genes ◽  
The Difference

Phu Quoc ridgeback dog is an invaluable species in Vietnam. The discovery of high-frequency rare halophytes E4 and E1 in Phu Quoc ridgeback dog while evaluate analyzing its genetic distances is an unexpected event. In this research, the primer-walking strategy was used to sequence the whole mtDNA of Phu Quoc ridgeback dogs carrying E4, B1 and E1 halophytes to explore trace of Phu Quoc ridgeback dog's origin. These mtDNA’s length (16,760 bp for PQ1 and 16,731 for PQ2) fall into the range of 16.7 kb, particularly, 16.760 bp in E4 dogs and 16.731 bp in B1 dogs and is basically similar to the ones of other dog breeds. The difference in length between E4 and B1 haplotype is mainly due to the difference of motif repeat frequency in the control region. The number of genes, starting and ending codes of E4’s mtDNA are similar to other common halophytes. Genetic distances between Phu Quoc ridgeback dogs' E1, E4 haplotypes and Pungsan dogs (EU789662) in the same clade in the phylogenetic tree are 0,072% and 0,24%, respectively, showing that Phu Quoc dogs with E haplotypes are very close relatively to Pungsan dogs in North-Korea. Although belonging to the same haplogroup, the genetic distance between Phu Quoc dogs E1 and E4 haplotype is 0,23%. In the other hand, genetic distances between E1, E4 haplotypes Phu Quoc ridgeback dogs and the closest grey wolves on phylogenetic tree are 0,3% and 0,1%, respectively. This is the first mitochondrial genome of E4 haplotype dogs to be sequenced and analyzed.

Polysomy and supernumerary chromosomes in Ornithogalum umbellatum L. (Liliaceae)

Genome ◽  
1987 ◽  
Vol 29 (1) ◽  
pp. 19-25 ◽  
Author(s):  
C. Ruiz Rejón ◽  
R. Lozano ◽  
M. Ruiz Rejón
Keyword(s):  
Key Words ◽  
Natural Population ◽  
Sierra Nevada ◽  
High Frequency ◽  
Variable Number ◽  
B Chromosomes ◽  
Structural Variants ◽  
Satellite Chromosome ◽  
Supernumerary Chromosomes ◽  
Numerical Variation

One hundred bulbs of Ornithogalum umbellatum L. have been analyzed cytogenetically in one natural population collected from the Sierra Nevada of Spain. Three types of plants were identified: (i) diploid plants (2n = 18, 26%); (ii) diploid plants with a variable number of B chromosomes (1–8 B's, 40%); and (iii) polysomic plants (2n = 19–23) with or without B's (34%). B's are of two types: metacentric and acrocentric and are associated with three types of abnormalities: (i) failure of the A chromosomes to move to the poles at anaphase I; (ii) nondisjunction of some A chromosomes at anaphase II; and (iii) the occurrence of tetraploid sporocytes. The B's are isopycnotic, do not associate with the A's, and invariably occur as univalents at first meiosis but show no tendency for elimination. All members of the complement except the satellite chromosome, no. 6, have been detected in a trisomic or a tetrasomic condition. Additionally some unusual structural variants, not present in the diploid standard complement, appear in some polysomic individuals. The polysomic elements are euchromatic, stable, and they do not associate either with normal chromosomes or with B's. The polysomic elements form univalents when they are trisomic and bivalents when tetrasomic. The fact that a high frequency (94%) of the polysomic elements also carry B's suggests that these two forms of numerical variation are interrelated in origin. Key words: Ornithogalum umbellatum, polysomy, supernumerary chromosomes.

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