Changes in DNA content and chromosome number during spermatogenesis in the gall midge Monarthropalpus buxi (Cecidomyiidae, Diptera)

Genome ◽  
1992 ◽  
Vol 35 (2) ◽  
pp. 244-250 ◽  
Author(s):  
B. Jazdowska-Zagrodzinska ◽  
R. Dallai ◽  
C. A. Redi
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Meiotic Division ◽  
Dna Content ◽  
Germ Line ◽  
Gall Midge ◽  
Key Words Dna ◽  
Further Development

In this paper we analyze the course of spermatogenesis in Monarthropalpus buxi. The first meiotic division occurs without any chromosomes pairing. As a result one spermatocyte II appears from which two sperms originate, and one residual cell, which does not undergo any further division. We found variations in chromosome number and DNA content between germ line cells of different individuals. Such variations were observed in the spermatocytes I and II, and in the sperms. In contrast, the residual cells, which did not take part in further development, always had the same DNA content and constantly inherited 20 chromosomes: 4 constituting one haploid set of the somatic type (S chromosomes) and 16 of the germ line limited type (E chromosomes).Key words: DNA content, chromosome number, Cecidomyiidae, germ line, spermatogenesis.

NUCLEAR PHENOMENA IN THE BASIDIUM OF CERATOBASIDIUM PRATICOLUM (KOTILA) OLIVE

1961 ◽  
Vol 39 (3) ◽  
pp. 717-725 ◽  
Author(s):  
H. K. Saksena
Keyword(s):  
Chromosome Number ◽  
Meiotic Division ◽  
Germ Tube ◽  
Diploid Nucleus ◽  
Haploid Chromosome Number ◽  
Spindle Axis ◽  
Further Development

The nuclear phenomena in the basidium of Ceratobasidium praticolum (Pellicularia praticola), studied by the Giemsa technique, are described and illustrated with photographs. The cells of the vegetative hyphae are multinucleate and those of the hymenia binucleate. Before fusion the two nuclei in the young basidium become closely adjacent, and their chromosomes are differentiated as elongated threads in two distinct groups. After the association of the karyolymph of the two nuclei, the chromosomes come into contact and pair. The diploid nucleus then undergoes meiosis. The haploid chromosome number is about six, with six bivalents present at the first meiotic (disjunctional) division. Apparent chromatid bridges were observed at anaphase I. The second meiotic division is equational. The spindle axis during both these divisions may be longitudinal, transverse, or oblique. The mature basidium has four nuclei which migrate through sterigmata into the basidiospores. Most of the basidiospores are uninucleate when young, but become binucleate at maturity. The basidiospore germinates by repetition or directly by a germ tube. In either case coenocytic growth is produced which, upon further development, is divided into multinucleate hyphal cells by the formation of cross septa.

Comparison of colony and stool blots for detection of enteropathogens by DNA probes

1991 ◽  
Vol 37 (5) ◽  
pp. 407-410
Author(s):  
Mônica A. M. Vieira ◽  
Beatriz E. C. Guth ◽  
Tânia A. T. Gomes
Keyword(s):  
Escherichia Coli ◽  
Key Words ◽  
Sensitivity And Specificity ◽  
Dna Probes ◽  
Type I ◽  
Enteropathogenic Escherichia Coli ◽  
Key Words Dna ◽  
E Coli ◽  
Heat Stable

DNA probes that identify genes coding for heat-labile type I (LT-I) and heat-stable type 1 (ST-I) enterotoxins, enteropathogenic Escherichia coli adherence factor (EAF), and Shigella-like, invasiveness (INV) are used to evaluate the sensitivity and specificity of stool blots in comparison with the sensitivity and specificity of colony blots in detecting enteropathoghens. The sensitivities of the probes in stool blots are 91.7% for the LT-I probe, 76.9% for the ST-I probes, 78.9% for the EAF probe, and 45.5% for the INV probe. The specificity of all probes is higher than 95%. In general, the stool blot method identifies as many if not more LT-I-, ST-I-, and EAF-producing E. coli infections than the colony blots. Key words: DNA probes, stool blots, enteropathogens, diagnosis.

DNA Content and Chromosome Number in Twenty–five Human Carcinomas

Oncology ◽  
1970 ◽  
Vol 24 (1) ◽  
pp. 48-57 ◽  
Author(s):  
J. Paulete-Vanrell
Keyword(s):  
Chromosome Number ◽  
Dna Content ◽  
Human Carcinomas

scholarly journals Canadian smart cities: a case for the circular economy in the age of "smart" innovation

2021 ◽  
Author(s):  
Vickey Simovic
Keyword(s):  
Key Words ◽  
Circular Economy ◽  
Smart City ◽  
Technology Innovation ◽  
Smart Cities ◽  
Digital Tools ◽  
Digital Innovation ◽  
Technological Advances ◽  
A Priority ◽  
Further Development

The Canadian Smart Cities Challenge enabled municipalities across the country to reflect on how smart city technology can be used to solve their unique community challenges, embrace the possibility of impactful projects, create collaborations, and create a suite of digital tools. This paper analyses whether governments can be catalysts in adopting circular economy thinking in the age of digital innovation. In reviewing the SCC applications, five proposal submissions were analysed in depth against a circular economy framework. Recommendations for further development in smart city thinking centre around future Smart Cities Challenges, and building circular assumptions into the challenge questions, whereby ensuring circular principles are a priority for municipalities as they continue to grow and adapt to smart city technological advances. Key words: Smart Cities Challenge, circular economy, smart city technology, innovation, sustainable,​ ​reuse, sharing, remanufacturing and repurposing

scholarly journals A taxonomic revision of the genus Cleome L. (Capparaceae) in Bangladesh

1970 ◽  
Vol 14 (1) ◽  
pp. 25-36
Author(s):  
Hosne Ara ◽  
Bushra Khan ◽  
Md. Mansur-ul-Kadir Mia
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Geographical Distribution ◽  
Taxonomic Revision ◽  
Economic Importance ◽  
Plant Taxon

The available record of the genus Cleome L. for Bangladesh has been updated in this paper and includes C. diffusa, C. gynandra, C. hassleriana, C. rutidosperma and C. viscosa. The updating has been done in case of nomenclature with important synonyms, local names, description of the taxa along with illustrations, flowering and fruiting times, ecological notes, specimens examined and their geographical distribution. For identification of the species, a dichotomous bracketed key has been added in this paper. Information on chromosome number and economic importance have also been provided where available. Key words: Cleome, Taxonomic revision, Capparaceae, Bangladesh DOI: 10.3329/bjpt.v14i1.520 Bangladesh J. Plant Taxon. 14(1): 25-36, 2007 (June)

Decision support systems for silviculture planning in Canada

1995 ◽  
Vol 71 (3) ◽  
pp. 291-298 ◽  
Author(s):  
William A. Thompson ◽  
Gordon F. Weetman
Keyword(s):  
Decision Support ◽  
Expert Systems ◽  
Decision Support Systems ◽  
Key Words ◽  
Support Systems ◽  
Technical Information ◽  
Telephone Interviews ◽  
Further Development

An attempt is made to identify presently available Decision Support Systems (DSS) for silviculture planning and operations. Recent sources of technical information are also identified. Based on telephone interviews, the use of and needs for silviculture DSS are outlined for eight of Canada's Model Forests. Recommendations are made for further development of DSS for Canadian silviculture. Key words: decision support systems, expert systems, silvicultural planning

Polyploidy in Sporobolus virginicus (L.) Kunth

1979 ◽  
Vol 27 (4) ◽  
pp. 429 ◽  
Author(s):  
AR Smith-White
Keyword(s):  
Salt Marsh ◽  
Chromosome Number ◽  
Meiotic Division ◽  
Distribution Patterns ◽  
Meiotic Behaviour ◽  
Polyploid Complex ◽  
South Eastern ◽  
Sporobolus Virginicus ◽  
Eastern Australia ◽  
Tetraploid Cytotypes

Chromosome number and meiotic behaviour was examined in Sporobolus virginicus Kunth from south-eastern Australia. Var. minor Bail. forms a polyploid complex with diploid (2n = 20), triploid and tetraploid cytotypes. Meiosis in tetraploid plants of this variety is substantially normal, which indicates an alloploid origin. Var. virginicus, which has been found only in the tetraploid state, has irregular meiotic division, which suggests autoploidy. Most cytotypes were collected from sandy and well-drained situations along the coast. However, tetraploid var. minor plants were generally found in poorly aerated salt marsh swamps. This apparent edaphic adaption of tetraploid cytotypes may be important in explaining distribution patterns.

scholarly journals Karyotype analysis with orcein and CMA in two species of Alocasia (Schott) G. Don (Araceae)

1970 ◽  
Vol 40 (1) ◽  
pp. 53-56 ◽  
Author(s):  
Syeda Sharmeen Sultana ◽  
Hosne Ara ◽  
Sheikh Shamimul Alam
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Karyotype Analysis ◽  
Chromosome Complement ◽  
Taxonomic Status ◽  
The Other ◽  
First Report ◽  
Total Length ◽  
Internet Information ◽  
Chromosomal Length

Alocasia fallax Schott and A. odora (Roxb.) Koch (Araceae) were investigated cytogenetically to confirm their taxonomic status. There is no report of 2n chromosome number for A. fallax in the available literature and internet information. Therefore the 2n chromosome number (2n = 28) found in this study is probably the first report for A. fallax. Alocasia odora showed exactly double 2n chromosome number (2n = 56) from A. fallax. In addition to chromosome number, the other karyotypic features of A. odora were exactly double for that of A. fallax. The centromeric formulae of A. fallax was 24 m + 4 sm whereas it is just double in A. odora. Total length of 2n chromosome complement of A. odora (62.58 μm) was almost double to A. fallax. The range of chromosomal length of the two species was almost same. Moreover, A. odora plant is much taller than A. fallax. All of these data suggests that A. odora might be an autotetraploid of A. fallax which in course of evolution had undergone some changes in GC-rich repeats. Key words: Alocasia; CMA; Karyotype analysis DOI: http://dx.doi.org/10.3329/bjb.v40i1.7998 Bangladesh J. Bot. 40(1): 53-56, 2011 (June)

scholarly journals Unconventional vegetables collected in Brazil: chromosome number and description of nuclear DNA content

2017 ◽  
Vol 17 (4) ◽  
pp. 320-326 ◽  
Author(s):  
Luis Felipe Lima e Silva ◽  
Vânia Helena Techio ◽  
Luciane Vilela Resende ◽  
Guilherme Tomaz Braz ◽  
Kátia Ferreira Marques de Resende ◽  
...  
Keyword(s):  
Chromosome Number ◽  
Dna Content ◽  
Nuclear Dna ◽  
Nuclear Dna Content
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