The influence of temperature on development, longevity, and fecundity in the Rutherglen bug, Nysius vinitor (Hemiptera : Lygaeidae)

1972 ◽  
Vol 20 (1) ◽  
pp. 67 ◽  
Author(s):  
M Kehat ◽  
M Wyndham
Keyword(s):  
Egg Laying ◽  
Population Increase ◽  
Threshold Temperature ◽  
Nymphal Development ◽  
Influence Of Temperature On ◽  
Males And Females ◽  
The Mean ◽  
The Difference ◽  
Fluctuating Temperatures ◽  
Significant Mortality

The mean duration of the egg stage of N. vinitor at constant temperatures ranged from 36.8 days at 15C to 3.8 days at 32C and that of the nymphs from 45 days at 20C to 12.0 days at 32C. Within the range 20-35C egg and nymphal mortalities were low; temperatures of 12 or 40C were lethal to both eggs and nymphs. Mean nymphal development times for males and females were similar. The threshold temperature for egg development was 14.5C and that for nymphs 15C; 70 and 225 day-degrees were required for completing egg and nymphal development respectively. The immature stages developed more rapidly at fluctuating temperatures out of doors than they did indoors at constant temperatures equal to the mean of the fluctuating temperatures. Within the range of screen temperatures 21.5-23.0C the difference between mean development in shade and in sun was 9-10 days. Age-specific fecundity and mortality schedules were determined for N. vinitor at constant temperatures. Temperature and longevity were inversely related and males survived longer than females. Thus at 22OC mean longevity of males was 115 days and of females 90 days, as compared with 31 and 18 days respectively at 30�C. After a maturation period that was longer at lower temperatures, daily egg-laying per female decreased with age from a maximum that occurred before there was significant mortality of females. The rates of the cumulative egg-laying increased with temperature from 22 to 35C. Mean total number of eggs per female was significantly higher at 25 and 30�C than at 22 or 35�C. However, life-table calculations revealed that a temperature of 35�C yielded the maximum rate of population increase. Within the range 22-35C, temperatures and rc values were linearly related. Unmated females laid significantly fewer eggs than those that had mated, but survived longer.

scholarly journals Quantitative electroencephalography as a tool for objective neurophysiological seizure diagnosis: A retrospective study

2020 ◽  
Vol 0 ◽  
pp. 1-6
Author(s):  
Rajesh Kumar ◽  
Tribhuwan Kumar ◽  
Kamlesh Jha ◽  
Yogesh Kumar
Keyword(s):  
Energy Level ◽  
Matched Control ◽  
Age Groups ◽  
Quantitative Electroencephalography ◽  
Beta Band ◽  
Significant Difference ◽  
Males And Females ◽  
The Mean ◽  
The Difference ◽  
Electrical Activities

Objectives: Seizure is the fourth most common neurological disorder in the world; it affects all age groups with equal possibility of occurrence in both males and females. Many antiepileptic drugs are available today, but its diagnosis is challenging. The present study attempted to see if seizure activities could be predicted by analyzing the pre-seizure electrical activities. The prediction may help in taking preventive measures appropriately beforehand in the individuals with seizure proneness. Material and Methods: We selected 11 generalized seizure patients and 19 control patients out of total 115 patients referred for electro-diagnostics for various reasons. EEG of the subjects recorded, segmented as per protocol, and analyzed using MATLAB and EEGLAB tools. Results: The mean energy level in alpha and beta band of the study subject was significantly lower (P = 0.04 and 0.004, respectively) as compared to the age matched control subjects. Theta and delta bands did not show any significant difference between the groups. The difference between the pre- and post-electrical seizure energy and entropy was statistically insignificant. Conclusion: The study shows that the energy level remains low in the seizure patients in the alpha and beta bands. This further goes down when electrophysiological seizure activities starts. The randomness or entropy does not alter significantly among the seizure subjects in comparison to non-seizure subjects.

Seasonal Field Energetics of the Rufous Rat-Kangaroo (Aepyprymnus-Rufescens)

1992 ◽  
Vol 40 (3) ◽  
pp. 279 ◽  
Author(s):  
IR Wallis ◽  
B Green
Keyword(s):  
New South ◽  
Water Flux ◽  
Behavioural Ecology ◽  
Free Living ◽  
Doubly Labelled Water ◽  
South Wales ◽  
Poor Understanding ◽  
Males And Females ◽  
The Mean ◽  
The Difference

Water flux and field metabolic rate (FMR) were measured by the doubly labelled water (DLW) method in free-living male and female rufous rat-kangaroos Aepyprymnus rufescens near Drake in northern New South Wales. The mean FMR of 499 kJ kg-1 day-1 was similar in winter and summer even though the difference in mean minimum temperatures between the two seasons was 20-degrees-C. Furthermore, we did not find any differences in FMR between males and females even though several females carried large pouch young or had young-at-foot. A poor understanding of the diet and the behavioural ecology of A. rufescens makes ft difficult to explain the similarities between sexes and seasons.

scholarly journals Compared nymphal development of Tingis americana (Hemiptera, Tingidae) in two Handroanthus species (Bignoniaceae) and reproductive parameters in seedlings of Handroanthus heptaphyllus

2013 ◽  
Vol 103 (2) ◽  
pp. 195-199 ◽  
Author(s):  
Daiane C. Moreira ◽  
Luiza R. Redaelli ◽  
Marcus Guidoti ◽  
Aline Barcellos
Keyword(s):  
Host Plants ◽  
First Record ◽  
Reproductive Parameters ◽  
Egg Viability ◽  
Rio Grande Do Sul ◽  
Botanic Garden ◽  
Porto Alegre ◽  
Nymphal Development ◽  
Males And Females ◽  
The Mean

Nymphs and adults of Tingis americana Drake, 1922 were found feeding on leaves of Handroanthus heptaphyllus (Vell.) Mattos and Handroanthus chrysotrichus (Mart. ex A. DC.) Mattos in the Botanic Garden, Porto Alegre, state of Rio Grande do Sul, Brazil. This is the first record of T. americana on these host plants and in the southern Brazil. We aimed to compare the nymphal development on both hosts and to analyze the reproductive parameters on H. heptaphyllus (25 ± 1ºC; 60 ± 10% RH; 16 h photophase). The mean nymphal period (days) was shorter in individuals reared on H. heptaphyllus (12.69 ± 0.076) than on H. chrysotrichus (19.11 ± 0.208) (P < 0.0001), however, nymph viability was similar. On H. heptaphyllus, the mean embryonic period lasted 12.32 ± 0.274 days and the egg viability was 92%. The mean total and daily fecundity were 310.0 ± 19.40 eggs/female and 7.46 ± 0.302 eggs/female/day, respectively. Paired males and females showed similar longevity (P = 0.0691), while unpaired females lived longer than unpaired males (P = 0.0460).

scholarly journals Establishment of a new relationship between posed smile width and lower facial height: A cross-sectional study

2015 ◽  
Vol 09 (03) ◽  
pp. 394-399 ◽  
Author(s):  
Aby Abraham ◽  
Jinu George ◽  
Elbe Peter ◽  
Koshi Philip ◽  
Rajesh Chankramath ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Facial Height ◽  
The Face ◽  
Facial Proportions ◽  
Males And Females ◽  
The Mean ◽  
The Difference

ABSTRACT Objective: The present study is intended to add a new parameter that would be useful in orthodontic clinical evaluation, treatment planning, and determination of vertical dimension (at occlusion). Materials and Methods: Standardized videographic recording of 79 subjects during posed smile was captured. Each video was then cut into 30 photos using the free studio software. The widest commissure-to-commissure posed smile frame (posed smile width [SW]) was selected as one of 10 or more frames showing an identical smile. Lower third of the face is measured from subnasale to soft tissue menton using a digital vernier caliper. Two values were then compared. Ratio between lower facial height and posed SW was calculated. Results: The co-relation between smiling width and lower facial height was found to be statistically significant (P < 0.01). The ratio of lower facial height and smiling width was calculated as 1.0016 with a standard deviation (SD) = 0.04 in males and 1.0301 with an SD = 0.07 in females. The difference between the mean lower facial height in males and females was statistically significant with a t = 10.231 and P = 0.000. The difference between the mean smiling width in males and females was also statistically significant with a t = 5.653 and P = 0.000. Conclusion: In class I subjects with pleasing appearance, normal facial proportions, normal overjet and overbite, and average Frankfort mandibular angle, the lower facial height (subnasale to soft tissue menton) is equal to posed SW.

scholarly journals The Haemoglobin Concentration of Normal English Males and Females

1933 ◽  
Vol 33 (1) ◽  
pp. 36-41 ◽  
Author(s):  
C. E. Jenkins ◽  
C. S. D. Don
Keyword(s):  
Statistical Significance ◽  
Haemoglobin Concentration ◽  
Gas Analysis ◽  
Experimental Accuracy ◽  
Males And Females ◽  
The Mean ◽  
The Difference ◽  
Made In

The determination of the mean normal haemoglobin concentration has re ceived more attention in America than in this country. Recently Price-Jones (1931) has compared the values in London with those found in America. He used the Haldane haemoglobinometer and his results are as accurate as is possible having regard to the method employed. In America his results were 3 percent. above those of the Haldane gas analysis apparatus (1901) by which theclinical instrument is supposed to be calibrated. Twenty comparisons were made in America and showed that the Haldane gas apparatus gave results averaging 2·6 per cent. below those of the Van Slyke apparatus. Price-Jones considers this to have no statistical significance. From the standpoint of experimental accuracy the difference is appreciable, as all methods for the measurement of oxygen combined with Hb are essentially pragmatic.

RATING OF THE VALENCE OF TWENTY NEGATIVES IMAGES FROM IAPS BY A SAMPLE OF MOROCCAN NURSE STUDENTS

2020 ◽  
Vol 18 (3) ◽  
pp. 383-391
Author(s):  
Lahcen Bandadi ◽  
Nadia Chamkal ◽  
Ahmed O. T. Ahami
Keyword(s):  
Emotional Stimulus ◽  
Negative Aspect ◽  
First Semester ◽  
Negative Valence ◽  
Significant Difference ◽  
Negative Images ◽  
Males And Females ◽  
The Mean ◽  
The Difference ◽  
Nurse Students

This study aims to rate twenty negative images from IAPS among a sample nurse students. We compare the mean valences between males and females and between participants from the final semester and participants from the first semester. The comparison of the mean valences values between the current study and the norm mean valence values from IAPS was established. null We tested 100 students from Higher Institute of Nursing Professions and Technics of Health, Rabat, Morocco, were recruited. The panel valence from SAM was cued to evaluate the perceived pleasure and unpleased degree after exposing the different images from IAPS to the participants. The displeasure degree among nurse students from final semester is lower than that of the first semester with a significant difference in sixteen images. Regarding the difference between males and females, the significant difference was observed only in five images. The all images evaluated by participant were perceived as negative (valence <4). Regarding the comparison of the mean valences values between a the current study and the norm mean valence values from IAPS significant differences were observed. Nurse students from the final semester, compared to the first semester students, perceived the negative images assessed as less unpleasant. However, we noted that the all images have kept the negative aspect. These results show that these images can be used as a negative emotional stimulus among this population.

scholarly journals Höstflyttande kungsfåglars Regulus regulus vikt på tre näraliggande rastplatser i sydöstra Sverige

Ornis Svecica ◽  
2011 ◽  
Vol 21 (1) ◽  
pp. 20-28
Author(s):  
Rolf Larsson
Keyword(s):  
Body Mass ◽  
Wind Direction ◽  
Autumn Migration ◽  
The South ◽  
Eastern Side ◽  
Males And Females ◽  
The Mean ◽  
The Difference ◽  
The Baltic

Goldcrests Regulus regulus trapped during autumn migration at three sites in southeastern Sweden (inland, peninsula cape, and island) showed significant differences in mean body mass, about the same in both males and females: 0.71 g heavier inland than on the island, 25 km to the south, and 0.25 g heavier inland than at the peninsula 8 km to the south. The main reason for the difference was that mean body mass decreased during the day at the island and peninsula sites while it increased strongly at the inland site. Data on wind direction during night was compared with the mean body masses the following days at the different sites. The lightest birds were trapped after nights with wind from the east and the heaviest after nights with wind from south to west. It is assumed that these light birds had started off from the eastern side of the Baltic and that this resulted in low body masses after a direct night flight. They then rapidly moved to more favourable inland sites to recover mass.

scholarly journals The influence of temperature on the biology of Triatominae. XIX. Triatoma maculata (Hemiptera, Reduviidae)

1993 ◽  
Vol 22 ◽  
Author(s):  
Ionizete Garcia da Silva ◽  
Ennio Luz
Keyword(s):  
Relative Humidity ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Males And Females ◽  
The Mean

Estudou-se a influência da temperatura no ciclo evolutivo de Triatoma maculata (Erichson) (Hemiptera, Reduviidae), tendo em vista uma criação em grande escala, em laboratório, para serem testados no xenodiagnóstico e, ainda, fornecer informações que subsidiem investigações sobre esta espécie. Apresentam-se os resultados do ciclo evolutivo obtidos a 25±0,5°C e 30°C±1,0°C , com umidade relativa de 70+5% e fotoperíodo de 12 horas, que foram de 223,5 e 222,3 dias, para machos e fêmeas, respectivamente, a 24°C e 30°C, a duração média foi de 168,7 e 167,2 dias, respectivamente, para machos e fêmeas. Abstract The influence of temperature on the biology of Triatoma maculata (Erichson) (Hemiptera, Reduviidae), was studied in order to obtain a larger number of Triatominae reared in laboratory. to use in xenodignosis. The experiments were performed in two climatized chambers at 25±0.5°C and 30°C±1.0°C , 70+5% of relative humidity and fotoperiod of 12 hours. The mean duration of the evolutive cycle for males and females was 223.5 and 222.3 days, at 25°C, and 168.7, and 167.2 days, at 30°C. Résumé L’influence de la temperature dans la biologie de Triatoma maculata (Erichson) (Hemiptera, Reduviidae), a été étudié. pour obtenir un grand numéro de Triatominae, élevé on laboratoire et utilizé le xenodiagnostique. Les épreuves ont étés faites dans deux chambres climatiques à 25±0,5°C et 30°C±1,0°C humidité relatif était 70±5% et le photopériode de 12 heurs. En moyenne, la durée du cycle évolutif a été pour les mâles et les femelles de 223,5 et de 222,3 jours à 25°C. et 168,7 et de 167,2 jours, à 30°C.

Fertility life table and biology of Tetrastichus giffardianus (Hymenoptera: Eulophidae) in the larvae of Ceratitis capitata (Diptera: Tephritidae)

2020 ◽  
pp. 1-8
Author(s):  
Elania Clementino Fernandes ◽  
Mariana Macedo Souza ◽  
Dori Edson Nava ◽  
Janisete Gomes Silva ◽  
Elton Lucio Araujo
Keyword(s):  
Life Table ◽  
Ceratitis Capitata ◽  
Intrinsic Rate ◽  
Mass Rearing ◽  
Population Increase ◽  
Intrinsic Rate Of Increase ◽  
Rate Of Increase ◽  
Males And Females ◽  
The Mean ◽  
Time Required

Abstract Tetrastichus giffardianus is a gregarious koinobiont endoparasitoid of tephritids, including Ceratitis capitata, which is one of the most important fruit pests worldwide. The objective of this study was to evaluate the effect of constant temperatures on the biology and development of the egg-adult period of T. giffardianus in larvae/pupae of C. capitata to construct a fertility life table. The study was carried out in climatic chambers at constant temperatures of 15, 20, 25, 30, and 35 ± 1°C, 70 ± 10% relative humidity and a photophase of 12 h. Complete egg and larval development occurred only at temperatures of 20, 25, and 30°C. The mean longevity of males and females was inversely proportional to temperature. The time of development of the pre-imaginal period was influenced by temperature and ranged from 41 days at 20°C to 11 days at 25°C. The best T. giffardianus performance occurred at 25°C when the intrinsic rate of increase was 0.21, the mean generation time was 20.43 days, the time required to double the population was 3.33 days, and the finite rate of population increase (λ) was 1.23. The results of this study provided information for the establishment of mass rearing and an evaluation of the adaptability of T. giffardianus to different environments, which is necessary for the use of this parasitoid in the biological control of tephritid pests, particularly C. capitata.

scholarly journals Sex Differences in Attention-Deficit/Hyperactivity Disorder (ADHD): Short Literature Review

2020 ◽  
pp. 72-76
Author(s):  
Oleksandra Ositkovska ◽  
Oхana Bayer
Keyword(s):  
Sex Differences ◽  
Processing Speed ◽  
Verbal Aggression ◽  
Difference Model ◽  
Men And Women ◽  
Hyperactivity Disorder ◽  
Males And Females ◽  
The Mean ◽  
The Difference ◽  
Girls With Adhd

The review of the latest foreign literature on the issue of sex differences in ADHD carriers is presented. The analysis of theories on the causes of the prevalence of the disorder among boys and girls is presented, and minor sex differences are highlighted. Therefore, ADHD is more common among boys than among girls, which leads to arguments about the difference valid in the prevalence of the disorder among men and women. Also, many researchers have noticed certain differences in the symptoms and behaviour of girls compared to boys, both in childhood and adulthood. Boys and girls with ADHD appear to be more similar than different, and usually the symptoms are not sex specific, but still there is a difference. In general, these differences are manifested in the fact that girls have problems with the emotional sphere and the predominant inattentive symptoms of ADHD, while boys have problems with the behavioural sphere and the predominant impulsive and hyperactive type of ADHD. Moreover, boys are more aggressive in behaviour than girls, although girls are more likely to manifest verbal aggression than their female peers, who do not have the disorder. It has been found that the difference in the prevalence of the disorder among males and females can be described by the Cognitive Endophenotype Theory, which assumes the influence of generally accepted endophenotypes on the severity of ADHD, that means processing speed, inhibition and working memory. This theory does not preclude theories such as the Mean Difference Model and the Variance Difference Model, which state that men on the average have more severe symptoms than women, and thus the scale of the severity of the ADHD among boys is much wider than among women.

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