scholarly journals FLIGHT RANGE OF AFRICANIZED HONEYBEES, Apis mellifera L. 1758 (Hymenoptera: Apidae) IN AN APPLE GROVE

1997 ◽  
Vol 54 (1-2) ◽  
pp. 85-88 ◽  
Author(s):  
B.A.J PARANHOS ◽  
J.M.M WALDER ◽  
J CHAUD NETO
Keyword(s):  
Apis Mellifera ◽  
Linear Regression ◽  
Analysis Of Variance ◽  
Test Area ◽  
Flight Behavior ◽  
The North ◽  
Flight Range ◽  
Center Point ◽  
Behavior Study ◽  
Africanized Honeybees

Africanized honeybees from five colonies were marked with P-32 and taken to an apple grove for a flight behavior study. The method used to determine the flight range was to put out an array of tagged trees in a cross pattern with the colonies arranged in the center point of a 0.8 ha test area. The tagged trees were located 10 meters apart in the 4 rows of 50 meters each, arranged according to the North, South, East, and West directions. Bees were collected while visiting the tagged tree flowers twice a day, during a ten-day period. The number of honeybees marked decreased in relation to the distance from the hives. Analysis of variance showed that a linear regression was highly significant to describe the process. Geographic directions did not affect the activity of the bees.

Abstract 221: Use of Statins in Patients with Coronary Artery Aneurysms: A Pilot Study from the North American Kawasaki Disease Registry

Circulation ◽  
2015 ◽  
Vol 131 (suppl_2) ◽  
Author(s):  
Michael Khoury ◽  
Michael A Portman ◽  
Cedric Manlhiot ◽  
Anne Fournier ◽  
Rejane F Dillenburg ◽  
...  
Keyword(s):  
Coronary Artery ◽  
Pilot Study ◽  
Kawasaki Disease ◽  
Linear Regression ◽  
North American ◽  
Z Score ◽  
Disease Registry ◽  
Coronary Artery Aneurysms ◽  
The North ◽  
Significant Difference

Background: Statins have been considered as therapy for children with coronary artery aneurysms (CAA) after Kawasaki disease (KD), due to potential beneficial pleiotropic effects which might influence chronic vascular processes and inflammation. Methods: The North American Kawasaki Disease Registry was queried to identify patients who have received statins in the first 6 months following the convalescent phase of KD. Each identified patient was matched by age, gender and CAA z score to 3 patients who were statin-naïve (controls). Linear regression models adjusted for repeated measures and maximum coronary involvement were used to determine an association of statin use with longitudinal changes in coronary artery diameter z-score. Kaplan-Meier analysis was used to compare freedom from angiographically-confirmed stenosis or interventions. Results: Of 29 patients with KD and CAA (maximum coronary artery z-score >10) who received statins at any time (of n=621, 5%), 10 (9 males) patients were started within 6 months of the acute KD episode. The mean age at KD was 6.3±3.4 years (5.4±3.5 for controls, p=0.57). Mean maximum CAA z-score was 36±14 (vs. 29±16, p=0.20); 90% of statin patients and 87% of matched controls had CAAs in 3 or more branches. Linear regression analysis of 442 serial echocardiograms showed that maximum CAA z-score decreased by -1.5 (95%CI: -2.7; -0.4) SD/year (p=0.008) for control patients compared to -2.9 (95%CI: -4.4; -1.4) SD/year (p<0.001) for statin treated patients. The difference between the rate of change of CAA z-score for statin vs. control patients did not reach statistical significance (controls vs. statins: +1.4 SD/year, 95%CI: -0.6; +3.4, p=0.18). n=7 patients (3 on statin, 4 controls) developed stenosis or had revascularization, with no significant difference between groups (HR for statin group: 2.2 (0.4-11.4), p=0.41). Conclusions: This underpowered pilot study suggests that equipoise likely exists with regards to statin therapy in children with KD and CAA, and that a formal registry-nested trial might be considered.

scholarly journals Etude Eco-Dendrométrique Du Dépérissement Du Cèdre De l’Atlas Dans Le Parc National De Theniet El Had “Algérie”

2016 ◽  
Vol 12 (29) ◽  
pp. 112
Author(s):  
Taleb Mohamed Lamine ◽  
Maatoug M’hamed ◽  
Azouzi Blel ◽  
Zedek Mohamed ◽  
Hellal Benchabane
Keyword(s):  
Analysis Of Variance ◽  
National Park ◽  
Ecological Factors ◽  
Management Plan ◽  
Ecological Data ◽  
Descriptive Data ◽  
North West ◽  
The North ◽  
The Relationship

This study aims to search the relationship between the decline of the Atlas cedar and the eco-dendrometrique factors in the National Park of Theniet El Had located in the north-west of Algeria. This study takes place throughout 30 circular plots of 1.000m2 area in which, a dendrometric measures and ecological data are taken in addition to descriptive data for Atlas cedar trees. The descriptive data shows that 34% of inventoried Atlas cedar have damaged leaves and 30% have more then 25% of their crowns damaged. The analysis of variance shows that there is no relationship between the rate of the Atlas cedar decline ant the ecological factors, components of the soil and dendrometric parameters except for the average circumference witch is influenced by the competition between trees. Therefor, a particular management plan for the regulation of competition is a necessity for this park.

scholarly journals The Effect of Course Length on Individual Medley Swimming Performance in National and International Athletes

2014 ◽  
Vol 42 (1) ◽  
pp. 187-200 ◽  
Author(s):  
Mathias Wolfrum ◽  
Christoph Alexander Rüst ◽  
Thomas Rosemann ◽  
Romuald Lepers ◽  
Beat Knechtle
Keyword(s):  
Linear Regression ◽  
Analysis Of Variance ◽  
Swimming Speed ◽  
Swimming Performance ◽  
National Level ◽  
Men And Women ◽  
Short Course ◽  
Course Length ◽  
Long Course ◽  
Short Courses

Abstract Effects of course length (25 m versus 50 m) and advances in performance of individual medley swimming were examined for men and women in Swiss national competitions and FINA World Championships during 2000-2011. Linear regression and analysis of variance (ANOVA) were used to analyse 200 m and 400 m race results for 26,081 swims on the Swiss high score list and 382 FINA finalists. Swiss and FINA swimmers of both sexes were, on average, 4.3±3.2% faster on short courses for both race distances. Sex-related differences in swim speed were significantly greater for FINA swimmers competing in short-course events than in long-course events (10.3±0.2% versus 9.7±0.3%, p<0.01), but did not differ for Swiss swimmers (p>0.05). Sex-related differences in swimming speed decreased with increasing race distance for both short- and long-course events for Swiss athletes, and for FINA athletes in long-course events. Performance improved significantly (p<0.05) during 2000-2011 for FINA men competing in either course length and FINA females competing in short-course events, but not for Swiss swimmers. Overall, the results showed that men and women individual medley swimmers, competing at both national and international levels, have faster average swimming speeds on short courses than on long courses, for both 200 m and 400 m distances. FINA athletes demonstrate an improving performance in the vast majority of individual medley events, while performance at national level seems to have reached a plateau during 2000-2011

scholarly journals IMPLEMENTASI TITIK KOORDINAT TENGAH KABUPATEN ATAU KOTA DALAM PERHITUNGAN JADWAL WAKTU SALAT

Al-Ahkam ◽  
2017 ◽  
Vol 27 (2) ◽  
pp. 213
Author(s):  
Moelki Fahmi Ardliansyah
Keyword(s):  
Comparative Analysis ◽  
Equilibrium Distance ◽  
The South ◽  
City Area ◽  
The North ◽  
Analysis Methods ◽  
Center Point ◽  
East And West ◽  
Point Data ◽  
Point Center

<p class="IABSSS">Study literature of Islamic Astronomy in case prayer times, is less from getting specific attention. Furthermore, the schedule of prayer times is very complex. Such as its still being distributed in form converting one to another area. It should be computed based on each district or city. Appearing new case that is coordinates point data (latitude and longitude) where used as center point computations. This thesis is researched the effect and importance implementation of center coordinate point from district or city in the determining of prayer times schedule. The research used mathemathic analytic descriptive and comparative analysis methods. With purpose to know in detail the comparation result from prayer times computations using center coordinate point and otherwise. The result of research shows the effect prayer times schedule can be applied for one district or city area. Meanwhile, computed prayer times schedule that use another center point coordinate not exactly can be applied in one district or city area. Though coordinate different value more than 0,5° and its position located in the south and east center coordinate point. Center coordinate point must be applied because at the base this coordinate point have been considered geographical aspect. Where in width side for the north, south, east and west have been considered and have the equilibrium distance.</p><p class="IABSSS">[]</p><p class="IABSSS">Kajian studi Astronomi Islam dalam persoalan waktu salat kurang mendapat perhatian khusus. Padahal persoalan jadwal waktu salat sangat komplek, seperti masih beredarnya jadwal waktu salat yang dikonversi dari satu daerah ke daerah lain. Sudah seharusnya jadwal waktu salat disusun berdasarkan kabupaten atau kota masing-masing. Persoalan baru yang muncul adalah data titik koordinat (lintang dan bujur) mana yang akan digunakan sebagai acuan perhitungannya. Dalam tulisan ini meneliti dampak dan perlunya implementasi titik koordinat tengah kabupaten atau kota dalam perhitungan jadwal waktu salat. Penelitian ini menggunakan metode deskriptif analitis matematis dan analisis komparatif, yang bertujuan untuk mengetahui secara detail hasil perbandingan perhitungan jadwal waktu salat dengan menggunakan titik koordinat tengah dan selain titik koordinat tengah. Penelitian ini menemukan bahwa, dampaknya jadwal waktu salat dapat diberlakukan untuk satu wilayah kabupaten atau kota. Sedangkan jadwal waktu salat yang diperhitungkan menggunakan selain titik koordinat tengah belum tentu dapat diberlakukan untuk satu wilayah kabupaten atau kota, apalagi selisih koordinatnya diatas 0,5° dan posisinya berada di sebelah selatan dan timur  dari titik koordinat tengah. Titik koordinat tengah perlu diimplementasikan, karena pada dasarnya titik koordinat ini telah mempertimbangkan aspek geografis. Dimana dalam segi luas untuk bagian utara, selatan dan timur, barat nya telah dipertimbangkan dan jaraknya pun seimbang.</p>

scholarly journals Additive and Heterotic Genetic Effects in the Haplo-diploid Honeybee Apis Mellifera

1987 ◽  
Vol 40 (1) ◽  
pp. 57 ◽  
Author(s):  
BP Oldroyd ◽  
C Moran
Keyword(s):  
Apis Mellifera ◽  
Analysis Of Variance ◽  
Combining Ability ◽  
Diallel Cross ◽  
Genetic Effects ◽  
Reciprocal Effects ◽  
Combining Ability Analysis ◽  
Additive Genetic Effects ◽  
Partial Diallel

Nine lines of honeybees were used to form a 9 x 9 partial diallel cross. Hamuli number was determined for samples of worker offspring. One set of workers was reared in non-maternal colonies which had been made uniform, as far as possible, with respect to colony strength (number of workers), while another set was sampled directly from the combs of each maternal colony. Combining ability analysis of variance revealed significant additive and non-additive genetic effects for both sets of data, regardless of whether inbred parentals were included or excluded from the analysis. Uniform rearing removed average heterosis and reciprocal effects.

scholarly journals Smallholder Sugarcane Farmers’ Participation and Profitability of Factory Contracted Services in Malava Sub-County, Kenya

2021 ◽  
Vol 25 (2) ◽  
pp. 54-65
Author(s):  
Francis Lekololi Ambetsa ◽  
Samuel Njiri Ndirangu ◽  
Samuel Chege Mwangi
Keyword(s):  
Linear Regression ◽  
Multiple Linear Regression ◽  
Analysis Of Variance ◽  
Random Sampling ◽  
Primary Data ◽  
Smallholder Farms ◽  
Western Kenya ◽  
Significant Difference ◽  
Gross Margins ◽  
Structured Questionnaire

This study evaluated the effect of participation in factory contracted services on the profitability of smallholder sugarcane farmers inMalava Sub-county in Western Kenya. Primary data were collected using structured questionnaire from a sample of 384 farmers usingsystematic random sampling and proportionate sampling. Analysis of variance was applied to determine if there was a significant difference between profitability of contracted and non-contracted farmers. The effect of contracted services on profitability among contract farmers was analyzed by multiple linear regression. The results showed that contracted extension, labour and credit services had significant effect on farmers’ gross margins. The Kenyan government should formulate policies that enhance provision of contracted extension, labour and credit services. The need for a review of the existing contract engagement terms among sugarcane farmers is also evident in this study. Keywords: smallholder farms, sugarcane, contracted services, gross margins

scholarly journals Effect of Land Cover Change and Elevation on Decadal Trend of Land Surface Temperature: A Linear Model with Sum Contrast Analysis

2021 ◽  
Author(s):  
Sahidan Abdulmana ◽  
Apiradee Lim ◽  
Sangdao Wongsai ◽  
Noppachai Wongsai
Keyword(s):  
Linear Regression ◽  
Land Cover ◽  
Surface Temperature ◽  
Linear Model ◽  
Land Surface Temperature ◽  
Land Surface ◽  
Control Group ◽  
Mountain Range ◽  
The North ◽  
Decadal Trend

Abstract Land surface temperature (LST) is a significant factor in surface energy balance and global climatology studies. Land cover (LC) and elevation are two factors that affect the change of LST, and their effects depend on different geography. This study aims to demonstrate an alternative approach to examine the change of LST during 20 years (2001 to 2020) on Taiwan Island and to investigate the effect of LC change and elevation on a decadal trend of LST using a linear model that adjusting for each determinate factor. MODIS LST and LC data, as well as GMTED2010 elevation product, were downloaded available website. The natural cubic spline function was used to model annual seasonal patterns in LST. Linear regression model was used to estimate decadal change of long-term LST time series. Weighted sum contrasts linear regression was used to assess the effect of LC transformation and elevation on the decadal LST change by comparing adjusting mean of all factors. The adopted analysis method was an appropriate approach to assess categorical factors than those based on treatment contrasts, requiring specifying a control group to compare means and confidence intervals. Results showed that there was an increase in LST for most of the island. The average daytime and nighttime LST trends were 0.12 and 0.31°C/decade, respectively. However, areas in the southern part of the north-south direction mountain range show a statistically significant increase in LST in both daytime and nighttime. The major landslides caused this noticeable change of surface temperature due to the catastrophic damage of typhoon Morakot in 2009. The results also revealed that the different pattern of LC change has a significant effect on daytime LST, but not on nighttime LST trends. The elevation above 600 m had affected both daytime and nighttime LSTs.

scholarly journals Electrophysiologic and behavioral responses mediated by volatiles involved in the repellency of Apis mellifera (Lepeletier) (Hymenoptera: Apidae)

2020 ◽  
Vol 13 ◽  
pp. e903
Author(s):  
Patricia Daniela da Silva Pires ◽  
Josué Sant'Ana ◽  
Ricardo Bisotto-de-Oliveira
Keyword(s):  
Apis Mellifera ◽  
Honey Bees ◽  
Laboratory Tests ◽  
Behavioral Responses ◽  
Field Conditions ◽  
Methyl Anthranilate ◽  
Threshold Response ◽  
Electrophysiological Responses ◽  
Africanized Honeybees ◽  
Chemotactic Behavior

Repellent volatiles to insects might be an important tool for management of bees in areas which the presence of these organisms is not required. This study aimed to evaluate the electroantennal and behavioral responses of Africanized honeybees (workers), Apis mellifera (Lepeletier) (Hymenoptera Apidae), at different ages, to benzaldehyde (BA) and methyl anthranilate (MA) and to evaluate the potential repellency of these compounds under field conditions. Laboratory tests were conducted to study electroantennographic responses (mV) and chemotactic behavior of worker bees aged 1-5 (young) and 20-30 (old) days in four choice olfactometer. Electrophysiological responses to each compound did not differ between young and old workers. Bees antennae (young) triggered significantly greater responses to BA, in the older ones, a higher response was observed to MA, both compared to control (ethanol). The threshold response to BA and MA was achieved at 10 µg/µL, both compounds repelled bees at the same dose in olfactometer. Treatments with BA and MA, in field conditions, were less visited by scouter honey bees than those without these compounds (control).

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