Algebras of bisexual population

2020 ◽  
pp. 77-124
Keyword(s):  
Bisexual Population

Neodolichodorus sinensis sp. nov. (Nematoda: Dolichodoridae) from China

Zootaxa ◽  
2010 ◽  
Vol 2362 (1) ◽  
pp. 63 ◽  
Author(s):  
KAN ZHUO ◽  
HONGHONG WANG ◽  
JINLING LIAO
Keyword(s):  
New Species ◽  
Guangdong Province ◽  
Nominal Species ◽  
Kandelia Candel ◽  
Marine Nematodes ◽  
Pathogenic Species ◽  
Bisexual Population ◽  
A New Species ◽  
Eleven Species

Neodolichodorus Andrássy, 1976 currently encompasses eleven species of plant ectoparasites, including pathogenic species such as N. australis Hodda & Nambiar, 2005 associated with damage to carrot (Hodda and Nambiar 2005). The genus has not to date been reported in China. In 2008, during a survey of marine nematodes in Futian Mangrove Reserve of Shenzhen, Guangdong Province, China, specimens of a bisexual population of Neodolichodorus were isolated from soil in the rhizosphere of Kandelia candel. Detailed studies of the nematode revealed that it differed from all other nominal species in the genus and it is herein described as a new species.

CYTOLOGY AND PARTHENOGENESIS OF THE WHEAT STEM SAWFLY, CEPHUS CINCTUS NORT. (HYMENOPTERA: CEPHIDAE)

1955 ◽  
Vol 33 (3) ◽  
pp. 161-174 ◽  
Author(s):  
Margaret Rowlatt Mackay
Keyword(s):  
Chromosome Complement ◽  
Chromosome Morphology ◽  
Diploid Males ◽  
Wheat Stem Sawfly ◽  
Cephus Cinctus ◽  
Bisexual Population ◽  
Monopolar Spindle ◽  
Spermatogonial Metaphase ◽  
Male Karyotype ◽  
Relationship Of

A chromosome complement of 18 was established for the female of Cephus cinctus Nort. by counts of 18 elements at oogonial metaphase and nine bivalents at pachytene. The male has a haploid set of nine chromosomes on the basis of counts at spermatogonial metaphase and at meiotic metaphases I and II. Male haploidy was confirmed by the fact that the male karyotype comprises one member of each morphologically identifiable pair present in the female. Spermatogenesis is characterized by lack of synapsis and complete abortion of the first meiotic division. Formation of a monopolar spindle at first meiotic metaphase is discussed. A cytological comparison of thelyotokous and arrhenotokous strains of C. cinctus failed to reveal any difference in chromosome number or in chromosome morphology. Cephus cinctus reproduces largely by arrhenotoky, the population normally being bisexual; the males develop from unfertilized eggs, most of the females arising from fertilized eggs; azygous, or impaternate, females occur sporadically. From the bisexual population a thelyotokous strain has arisen that is not distinguishable by cytological comparison; the females of both arrhenotokous and thelyotokous races are diploid; no diploid males were found. The haplo-diploid relationship of male to female was confirmed; male haploidy has become established by adaptive modifications in meiosis, as indicated in the cytological details given.

Tackling social and health inequalities: vulnerability among the young lesbian, gay and bisexual population in Ireland

2013 ◽  
Vol 4 (3) ◽  
pp. 268-282 ◽  
Author(s):  
Patricia Mannix-McNamara ◽  
Emmanuel O’Grady ◽  
Eva Devaney ◽  
Didier Jourdan
Keyword(s):  
Health Inequalities ◽  
Bisexual Population ◽  
And Bisexual

scholarly journals Numerical and structural chromosome polimorphism in fish species: Carassius auratus gibelio b. and alburnus alburnus L.

2003 ◽  
Vol 57 (1-2) ◽  
pp. 11-22
Author(s):  
Svetlana Fister
Keyword(s):  
Fish Species ◽  
Carassius Auratus ◽  
Silver Carp ◽  
Carassius Auratus Gibelio ◽  
Bisexual Population ◽  
Structural Chromosome ◽  
Accessory Chromosomes ◽  
Gynogenetic Lines

The paper presents the results of cytogenetic investigations of the fish species Carassius auratus gibelio, B. and Alburnus alburnus, L. Karyotype definitions are given for fish caught at different localities in Serbia. Within the bisexual population of the silver carp Carassius auratus gibelio B., we observed variability in the number of the last, smallest akrocentrics (2n=100_ 22-4). These variating accessory chromosomes were called Banalogues. We established the number of chromosomes (3n=150+8 and 3n=150+10) and gave the karyotype characteristics for gynogenetic lines of triploid females. We pointed out that the existing clones differ in the number of chromosomes, i.e. in the number of Banalogues, which are also probably the cause of the occurence of - gynogenetic karyoclones. In the species Alburnus alburnus, L., we established the existence of modified karyotipes with a large metacentric - Robertson's fusion, translocation probably formed by the two biggest akrocentrics. We examined the possibility of maintaining variability in populations of this specie. The results are discussed in comparison to disorders which result from these changes in reproduction, and the possible consequences that can be expected in the offispring.

scholarly journals Sexually Transmitted Infections and Associated Factors in Homosexuals and Bisexuals in Granada (Spain) During the Period 2000–2015

2019 ◽  
Vol 16 (16) ◽  
pp. 2958 ◽  
Author(s):  
Llavero-Molino ◽  
Sánchez-Ocón ◽  
Pérez-Morente ◽  
Espadafor-López ◽  
Martín-Salvador ◽  
...  
Keyword(s):  
Sexually Transmitted Infections ◽  
Economic Recession ◽  
Public Health Issue ◽  
Cross Sectional ◽  
Major Public Health Issue ◽  
Sexually Transmitted ◽  
Sexual Orientation Identity ◽  
Bisexual Population ◽  
And Bisexual ◽  
Clinical Records

Sexually transmitted infections (STIs) are a major public health issue. Previous research shows the vulnerability of the homosexual and bisexual population, as well as the influence of economic, political, and cultural determinants. The aim of this study was to describe the socio-demographic healthcare profile and the main risk factors associated with STIs in homosexuals and bisexuals seen at the STI clinic in Granada (Spain) during the years 2000–2015. Infection prevalences were compared between the economic crisis period (2008–2014) and the rest of the years analysed. A cross-sectional observational and analytical study was conducted by reviewing 261 clinical records of individuals with suspected or present infection. Univariate, bivariate, and multivariate analyses were performed. 91.2% of the individuals were men, and 8.8% were women, with the mean age being 28.61 (SD = 9.35, Range = 17–74) years old. The prevailing sexual orientation identity was homosexual. 94.2% were single. The main reason for consultation was HIV. Differences in prevalence were found between crisis and non-crisis years (OR = 3.91; 95% CI = 1.73–9.19). In conclusion, their profile was that of a young, single man suspecting possible HIV infection. STI prevalence was significantly higher in the years of economic recession in comparison to the rest of the years.

On the asymptotic properties of a supercritical bisexual branching process

1986 ◽  
Vol 23 (03) ◽  
pp. 820-826 ◽  
Author(s):  
J. H. Bagley
Keyword(s):  
Population Size ◽  
General Class ◽  
Population Model ◽  
Branching Process ◽  
Asymptotic Properties ◽  
Almost Sure Convergence ◽  
Random Variable ◽  
Convergence Result ◽  
Bisexual Population

An almost sure convergence result for the normed population size of a bisexual population model is proved. Properties of the limit random variable are deduced. The derivation of similar results for a general class of such processes is discussed.

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