COUPLING BEHAVIOUR OF THE MIGRATORY GRASSHOPPER, MELANOPLUS SANGUINIPES (ORTHOPTERA: ACRIDIDAE)

1972 ◽  
Vol 104 (6) ◽  
pp. 873-879 ◽  
Author(s):  
R. Pickford ◽  
C. Gillott
Keyword(s):  
Sexual Activity ◽  
Melanoplus Sanguinipes ◽  
Male And Female ◽  
Female Mating ◽  
Unfavourable Weather ◽  
High Level

AbstractThe mechanics of coupling in Melanoplus sanguinipes (Fabr.) are described and differences between some species of Acrididae discussed. A high level of coupling activity was revealed with the most active male and female mating 56 and 46 times, respectively. In addition, multiple daily matings, to a maximum of five, were common. The majority of copulations occurred during the morning in both laboratory and field; however, in the latter, unfavourable weather restricted sexual activity. Coupling did not appear to occur at random; significant preferences were shown by certain males for certain females.

scholarly journals High level of fatty liver index predicts new onset of diabetes mellitus during a 10-year period in healthy subjects

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yukimura Higashiura ◽  
Masato Furuhashi ◽  
Marenao Tanaka ◽  
Satoko Takahashi ◽  
Masayuki Koyama ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Fatty Liver ◽  
Male And Female ◽  
Nonalcoholic Fatty Liver ◽  
Liver Index ◽  
Fatty Liver Index ◽  
History Of ◽  
Onset Of Diabetes ◽  
High Level ◽  
New Onset

AbstractFatty liver index (FLI), a predictor of nonalcoholic fatty liver disease, has been reported to be associated with several metabolic disorders. This study aimed to evaluate the relationship between FLI and new onset of diabetes mellitus (DM). We investigated the association of FLI with new onset of DM during a 10-year period in subjects who received annual health examinations (n = 28,990). After exclusion of subjects with DM at baseline and those with missing data, a total of 12,290 subjects (male/female: 7925/4365) who received health examinations were recruited. FLI was significantly higher in males than in females. During the 10-year period, DM was developed in 533 males (6.7%) and 128 females (2.9%). Multivariable Cox proportional hazard models with a restricted cubic spline showed that the risk of new onset of DM increased with a higher FLI at baseline in both sexes after adjustment of age, fasting plasma glucose, habits of alcohol drinking and current smoking, family history of DM and diagnosis of hypertension and dyslipidemia at baseline. When the subjects were divided into subgroups according to tertiles of FLI level at baseline (T1–T3) in the absence and presence of impaired fasting glucose (IFG), hazard ratios after adjustment of the confounders gradually increased from T1 to T3 and from the absence to presence of IFG in both male and female subjects. In conclusion, a high level of FLI predicts new onset of DM in a general population of both male and female individuals.

Sperm Competition and the Dynamics of X Chromosome Drive: Stability and Extinction

Genetics ◽  
2002 ◽  
Vol 160 (4) ◽  
pp. 1721-1731 ◽  
Author(s):  
Jesse E Taylor ◽  
John Jaenike
Keyword(s):  
Sex Ratio ◽  
Sperm Competition ◽  
X Chromosome ◽  
Sex Chromosome ◽  
Basin Of Attraction ◽  
Male Mating ◽  
Male And Female ◽  
Mating Rate ◽  
Female Mating ◽  
Balanced Polymorphism

AbstractSeveral empirical studies of sperm competition in populations polymorphic for a driving X chromosome have revealed that Sex-ratio males (those carrying a driving X) are at a disadvantage relative to Standard males. Because the frequency of the driving X chromosome determines the population-level sex ratio and thus alters male and female mating rates, the evolutionary consequences of sperm competition for sex chromosome meiotic drive are subtle. As the SR allele increases in frequency, the ratio of females to males also increases, causing an increase in the male mating rate and a decrease in the female mating rate. While the former change may exacerbate the disadvantage of Sex-ratio males during sperm competition, the latter change decreases the incidence of sperm competition within the population. We analyze a model of the effects of sperm competition on a driving X chromosome and show that these opposing trends in male and female mating rates can result in two coexisting locally stable equilibria, one corresponding to a balanced polymorphism of the SR and ST alleles and the second to fixation of the ST allele. Stochastic fluctuations of either the population sex ratio or the SR frequency can then drive the population away from the balanced polymorphism and into the basin of attraction for the second equilibrium, resulting in fixation of the SR allele and extinction of the population.

Dental Interns’ Perceptions of Their Training Experiences at Different Training Centers: A Look at Work Environment and Supervision

2021 ◽  
Author(s):  
Ali Alenezi
Keyword(s):  
Work Environment ◽  
Learning Outcomes ◽  
Field Experience ◽  
Learning Experience ◽  
Training Experience ◽  
Male And Female ◽  
The Third ◽  
Level Of Satisfaction ◽  
Strongly Agree ◽  
High Level

Abstract Background: the aim of this study was to explore dental interns perceptions on their learning environment and supervision. Methods: This survey was in form of questioner in which interns are required to fill and submit at the end of each training rotation. The questionnaire includes 20 items and was divided into three main parts: the first part of the questionnaire evaluated the interns perception toward the learning outcomes obtained from the field experience and their development. The second part of the study assessed the interns' perceptions toward their supervisors. The third part of the questionnaire investigated the interns' perceptions toward training centers facilities. Results: A total number of 234 questioners were filled and submitted by interns in which 134 from male intern (57.3%) and 100 from female interns (42.7%). In general, the interns from both genders appeared very satisfied with their training experience. With all the questionnaire 20 items, more than 75% of the obtained answers was either agree or strongly agree with similar obtained from both male and female interns. Conclusions: High level of satisfaction can be obtained when the the field experience outcomes is clearly explained to the dental interns. In addition, the availability of supervisors with full awareness of learning outcomes will improve the learning experience of dental interns.

Investigating the circumstances under which singers use imagery: A pilot study

2019 ◽  
pp. 030573561986829 ◽  
Author(s):  
Brianna DeSantis ◽  
Sarah Deck ◽  
Craig Hall
Keyword(s):  
Pilot Study ◽  
Qualitative Study ◽  
Character Development ◽  
Performance Anxiety ◽  
Structured Interviews ◽  
Male And Female ◽  
Vocal Technique ◽  
Professional Dancers ◽  
High Level

This is a qualitative study in which detailed, semi-structured interviews were conducted with six male and female high-level singers. In comparison to Nordin and Cumming’s work on professional dancers, some similarities and some unique differences emerged from the results. The Four Ws framework was employed, which involves Where, What, Why, and When singers image. Like in Nordin and Cumming’s study, How was a dimension that emerged inductively from the results. Singers mainly used imagery for improving vocal technique, performance anxiety, and character development.

Multiple sire mating in swine; evidence of natural selection for mating efficiency

1961 ◽  
Vol 56 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Lavon J. Sumption
Keyword(s):  
Natural Selection ◽  
Mating Behaviour ◽  
Animal Breeding ◽  
Evolutionary Significance ◽  
Mating Frequency ◽  
Combined Effects ◽  
Male And Female ◽  
Female Mating ◽  
Mating Efficiency ◽  
Selection For

Evidence of natural selection for certain aspects of mating efficiency in swine are advanced based on preliminary studies with thirty-one sires, fiftyeight dams and their progeny. Selective fertilization was conclusively demonstrated. Variations in male and female mating behaviour were sufficiently large to indicate considerable non-randomness of mating frequency under the conditions of multiple sire mating (i.e. group exposure of dams to selected sires). The combined effects of the separate phenomena of selective fertilization and mating behaviour are discussed in relation to their evolutionary significance in animal breeding.

Smoking Habits among Norwegian Doctors 1974

1977 ◽  
Vol 5 (3) ◽  
pp. 127-136 ◽  
Author(s):  
Leif-Edvard Aarø ◽  
Kjell Bjartveit ◽  
Odd D. Vellar ◽  
Else-Lill Berglund
Keyword(s):  
General Population ◽  
Cigarette Smoking ◽  
Small Proportion ◽  
Medical Profession ◽  
Age Groups ◽  
Smoking Habits ◽  
Male And Female ◽  
Younger Age ◽  
Level Of Knowledge ◽  
High Level

In the spring of 1974 a representative sample ( N = 1200) of all doctors in Norway (6000) received a mailed questionnaire regarding past and present smoking habits. Close to 95% responded. Among late responders there was a disproportionately high number of smokers. As compared with the general population, both male and female doctors constitute a small proportion of daily smokers and a large proportion of exsmokers. The greatest contrasts are observed in the younger age groups. The percentage of daily smokers in this crossectional study on the medical profession is approximately 50% lower than that found in the 1952–53 study on Norwegian doctors. There is also a shift away from cigarette smoking toward the use of pipe and cigars, which is not found in the general population. Answers to questions regarding reasons for quitting as well as certain attitudinal indicators show that the doctors' reduction in smoking is related to their professional involvement and high level of knowledge concerning the health consequences of smoking.

Sign in / Sign up

Export Citation Format

Share Document