Comparison of locations used in cotton-breeding trials

1992 ◽  
Vol 32 (6) ◽  
pp. 739 ◽  
Author(s):  
ER Williams ◽  
DJ Luckett ◽  
PE Reid ◽  
NJ Thomson
Keyword(s):  
Regression Analysis ◽  
The Other ◽  
Cultivar Differences ◽  
Yield Data ◽  
Cotton Breeding ◽  
Eastern Australia ◽  
Discrimination Criterion ◽  
The Mean ◽  
Joint Regression Analysis ◽  
The Stability

Cotton-breeding trials are conducted annually throughout the commercial growing regions of eastern Australia. Accumulated yield data for the period 1974-85 were assembled into an incomplete cultivar x location x year table. This table was then analysed in order to compare test locations. The method involved analysing cultivar x location tables separately for each year, using symmetric joint regression analysis. Results were then collected into location x year tables and further analysed. Four criteria for comparing test locations were developed. The discrimination criterion is important when locations are evaluated in terms of their ability to display cultivar differences. The representation criterion measures the ability of a location to mirror the relative performance of cultivars over all locations. The other 2 criteria are concerned with the mean yield at test locations and the stability of location yields over years. Based on the 4 criteria, preferred test locations are recommended.

scholarly journals Evaluation of the effect of force direction on stationary anchorage success of mini-implant with a lever-arm–shaped upper structure

2011 ◽  
Vol 81 (5) ◽  
pp. 776-782 ◽  
Author(s):  
Ki-Ho Park ◽  
Eun-Man Lee ◽  
Seung-il Shin ◽  
Seong-Hun Kim ◽  
Young-Guk Park ◽  
...  
Keyword(s):  
Primary Stability ◽  
The Other ◽  
Control Group ◽  
Removal Torque ◽  
Lever Arm ◽  
Mini Implants ◽  
Force Direction ◽  
The Mean ◽  
The Stability ◽  
Experimental Group

Abstract Objective: To compare the effect of clockwise and counterclockwise torque on the primary stability of a mini-implant with a lever-arm–shaped upper structure. Materials and Methods: Twenty-four white rabbits were used for this study. Two screw-type mini-implants were placed in each tibia. In all, 96 screws were inserted. Two weeks later, a 2-N force was applied to the mini-implants without an upper structure in eight rabbits (control group). The mini-implants of the other 16 rabbits were loaded with an upper structure (experimental group). In the experimental group, the two left mini-implants were loaded in a clockwise direction (CW group) and the two right implants were loaded in a counterclockwise direction (CCW group). The rabbits were sacrificed at 1 week or 8 weeks after loading in both control and experimental groups. The removal torque value (RTV) was measured in 15 of 16 mini-implants in each group and the remaining implant was processed for histologic examination. Results: At 1 week there were no significant differences in the mean RTV between the control, CW, and CCW groups. At 8 weeks, the RTV was higher in the control and experimental groups than in the respective 1-week groups. At 8 weeks, there were no significant differences in the RTV between the control and CW groups, but the CCW group showed a lower RTV. Conclusions: CCW torque can decrease the stability of a mini-implant, whereas a CW torque has no effect.

Variability in grain protein concentration of peas and lentils grown in Australia

1993 ◽  
Vol 44 (6) ◽  
pp. 1415 ◽  
Author(s):  
FL Stoddard ◽  
DR Marshall ◽  
SM Ali
Keyword(s):  
Crude Protein ◽  
Protein Concentration ◽  
Genotypic Variation ◽  
The Other ◽  
Grain Protein ◽  
Yield Data ◽  
Grain Protein Concentration ◽  
Variety Trials ◽  
The Mean ◽  
Selection Of

Protein and yield data were obtained from South Australian and Interstate pea and lentil variety trials conducted between 1986 and 1989, covering 94 pea and 58 lentil genotypes. Crude protein concentration varied significantly across sites and averaged 25.0% in peas and 24.4% in lentils. Protein concentration was not significantly correlated with yield at most individual sites. Minimum protein concentration in peas was 1.6% below the mean of three check cultivars in line RA155, while the maximum was 2.3% above that mean in lines P255-2 and P262-1. In lentils the range was 1.2% above the check mean in ILL5562 and 1.0% below in ILL6017. A further lentil genotype, 'Chilean', was 6.0% above controls, but was inadequately replicated in these trials. Genotypic variation in pea and lentil protein concentration was lower than in many other species, but the lack of correlation between protein and yield suggests that independent selection of both characters during breeding is possible and should be successful without the rate of gain in one trait being reduced by that in the other.

scholarly journals Adaptation to a marginal intake of energy in young children

1990 ◽  
Vol 63 (2) ◽  
pp. 145-154 ◽  
Author(s):  
N. Kennedy ◽  
A. V. Badaloo ◽  
A. A. Jackson
Keyword(s):  
Weight Loss ◽  
Regression Analysis ◽  
Marked Reduction ◽  
Linear Regression Analysis ◽  
Stool Frequency ◽  
Metabolizable Energy ◽  
The Other ◽  
N Retention ◽  
The Mean ◽  
Metabolizable Energy Intake

Six male children, aged 8–28 months, were studied for three consecutive periods of 1 week each. They were given diets that provided 1.7 g protein/kg per d and supplements of minerals and vitamins, with a metabolizable energy intake during the 1st, 2nd and 3rd week of 419, 293 and 335 kJ (100, 70 and 80 kcal)/kg per d, diets 1, 2 and 3 respectively. All the food offered was consumed. Each child was weighed at the same time each day on an electronic balance. On the 6th and 7th day of each study period urine and stool were collected for 24 h to assess nitrogen balance. Using linear regression analysis it was shown that all children gained weight on diet 1, 2.3 (sd 1.3) g/kg per d, and five of six children gained weight on diet 3, the mean for the whole group being 2.7 (sd 2.3) g/kg per d, not significantly different. On diet 2 all children lost weight, -5.4 (sd 1.3) g/kg per d, highly significantly different from each of the other dietary periods. Using asymptotic regression analysis it could be shown that the rate of weight loss during the first part of the week on diet 2, - 11 g/kg per d, was greater than at the end of the week, - 2 g/kg per d, with a tendency towards a steady weight by day 7. Apparent N retention (mg/kg per d) was positive at the end of each of the three dietary periods: diet 1, 112 (sd 25); diet 2, 54 (sd 34); diet 3, 82 (sd 20). In five of the six children there was a marked reduction in stool frequency on diet 2 compared with diet 1, that was maintained to the period on diet 3. The findings suggest that during the period on diet 2 there was a saving of energy of the order of 105 kJ (25 kcal)/kg per d, which lasted through into the period on diet 3.

Drought resistance in spring wheat cultivars. I. Grain yield responses

1978 ◽  
Vol 29 (5) ◽  
pp. 897 ◽  
Author(s):  
RA Fischer ◽  
R Maurer
Keyword(s):  
Grain Yield ◽  
Field Experiments ◽  
Water Status ◽  
Cultivar Differences ◽  
Yield Potential ◽  
Severe Drought ◽  
Yield Data ◽  
Wide Range ◽  
The Mean ◽  
Yield Responses

With a view to understanding the basis of cultivar differences in yield under drought, a wide range of cereal cultivars representing durum wheats (Triticum turgidum L.), triticales (X Tritosecale Wittmack), barleys (Hordeum vulgare), and especially tall and dwarf bread wheats (T. aestivum L.) were studied in field experiments in north-western Mexico over three seasons. Drought was created in this rain-free environment by permanently terminating irrigation at various stages before anthesis. Control treatments were well watered throughout the growing period. Detailed measurements of plant water status, leaf area and dry matter production, anthesis date, yield components and grain yield were made. This paper presents primarily the grain yield data. Drought levels were such that the mean yield of all cultivars under drought ranged from 37 to 86% of control yield, corresponding to irrigation cut-offs varying from 69 days before mean anthesis date to only 10 days before. In each experiment the grain yield under drought showed highly significant cultivar differences, which appeared consistent between years. Yields were adjusted for drought escape by using a correction factor which ranged from 2.9 to 8.5 g/m2 per day advance in flowering, being greater in experiments with less severe drought. The demonstration of linear relationships between cultivar yield and drought intensity, as indicated by the mean yield of some or all cultivars, prompted the consideration of cultivar yield under drought as the function of yield potential (Yp, yield without drought), drought susceptibility index (S), and intensity of drought. The cultivar groups showing lowest S values (most droughtresistant) were tall bread wheats and barleys; dwarf bread wheats were intermediate, and durum wheats and triticales were the most susceptible. However, because dwarf wheats have a higher yield potential (Yp) than tall bread wheats, it is suggested that, as a group, tall bread wheats would outyield dwarf wheats only under very severe drought. Also there was considerable within-group variability of S and Yp. Cultivar S values were consistent across experiments. Yield responses of tall and dwarf bread wheat groups obtained in these experiments agreed with those seen in extensive international trials under dryland conditions.

The influence of cation properties on the shape of silicate chains

1981 ◽  
Vol 155 (1-2) ◽  
Author(s):  
Friedrich Liebau ◽  
Ilse Pallas
Keyword(s):  
Regression Analysis ◽  
Repeat Unit ◽  
The Other ◽  
Crystal Chemical ◽  
Strongly Correlated ◽  
Single Chain ◽  
The Mean ◽  
General Relations ◽  
Periodic Chain ◽  
Silicate Chain

AbstractThe shape of silicate single chains is described by their periodicity (number of tetrahedra in the repeat unit of the chain) and the degree of shrinkage compared with a maximum stretched chain.From a regression analysis of 54 single chain silicates it is concluded that such silicates can be divided into two groups: (1) Silicates with odd-periodic chains (pyroxenoids and pyroxenes) and (2) silicates with even-periodic chains.Although the results of the analysis are not accurate enough to make reliable quantitative predictions about the shape of a silicate chain merely from the chemical composition of the silicate, some general relations could be found. So it turned out that even-periodic chains become less stretched with higher mean electronegativity and higher mean valence of their cations. In contrast, for odd-periodic chain silicates the degree of chain shrinkage is strongly correlated with the mean electronegativity and less so with the mean radius of the cations. On the other hand, the periodicity of the silicate chains is directly correlated with their degree of shrinkage. These results of the regression analysis are explained in terms of simple crystal chemical considerations.

Measuring abundance of juvenile abalone, Haliotis rubra Leach (Gastropoda : Haliotidae); Comparison of a novel method with two other methods

1988 ◽  
Vol 39 (3) ◽  
pp. 331 ◽  
Author(s):  
PE McShane ◽  
MG Smith
Keyword(s):  
Size Range ◽  
The Other ◽  
Anaesthetic Technique ◽  
South Eastern ◽  
Eastern Australia ◽  
Novel Method ◽  
Haliotis Rubra ◽  
The Mean ◽  
Suction Sampler ◽  
Searching Method

An underwater venturi-suction sampler is described, suitable for sampling fauna on structurally-complex sublittoral reefs. Abundance of juvenile Haliotis rubra was estimated from the samples collected with the suction sampler; this was compared with estimates obtained at the same time by two other methods, an anaesthetic method and a searching method. Off Sandpatch Point (south-eastern Australia) during January 1987, the mean number (s.e.) of H. rubra per square metre of substrate was 68.7 (s.e., 39.2) by the suction method, 25.6 (s.e., 16.1) by the anaesthetic method and 7.7 (s.e., 3.0) by the searching method. Off Cape Schanck, the respective numbers were 1.3 (s.e., 0.5), 1.2 (s.e., 0.5) and nil. Juveniles found in the population off Sandpatch Point were of a size range (430-1020 �m) consistent with recent settlement of H. rubra. The suction method has three main advantages over the other two methods: unlike the anaesthetic technique it is not destructive and is not restricted to removable substrate; it is readily applied to most reef substrata by one diver spending relatively little time under water; and the sampler is sufficiently powerful to remove all juvenile abalone from the reef surface.

Serum Irisin Levels in Central Precocious Puberty and Its Variants

2020 ◽  
Vol 106 (1) ◽  
pp. e247-e254
Author(s):  
Esra Kutlu ◽  
İlker Tolga Özgen ◽  
Huri Bulut ◽  
Abdurrahim Koçyiğit ◽  
Hafize Otçu ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Precocious Puberty ◽  
Linear Regression Analysis ◽  
Central Precocious Puberty ◽  
Multivariate Linear Regression ◽  
The Other ◽  
Multivariate Linear Regression Analysis ◽  
Premature Thelarche ◽  
The Mean

Abstract Aim The exact mechanisms that trigger the onset of puberty are not well known. Adipomyokines are postulated to stimulate the central neural network. In the present study, we investigated irisin levels in girls with central precocious puberty (CPP), slowly progressing precocious puberty (SPPP), or premature thelarche (PT); we also studied prepubertal girls and to determine if this adipomyokine could be used as a marker in this context. Methods A total of 94 girls including 33 with CPP, 31 with precocious puberty (PP) variants (SPPP or PT), and 30 healthy controls were enrolled to the study. The mean irisin levels were compared between groups. The bivariate correlations of irisin levels with clinical and laboratory parameters were assessed. Multivariate linear regression analysis was performed to determine independent predictive factors of irisin levels. Results Irisin levels were higher in the CPP group compared with the other groups (CPP group: 723.25 ± 62.35 ng/mL; PP variants group: 529.60 ± 39.66 ng/mL; and control group: 325.03 ± 27.53 ng/mL) (P < 0.001). Irisin levels were positively correlated with body mass index standard deviation scores (BMI-SDS), height-SDS, weight-SDS, bone age, uterus long axis, ovary size, baseline FSH and LH, and peak LH levels. Multivariate linear regression analysis revealed that irisin levels had the strongest correlation with peak LH. The other independent predictive factor of irisin levels was BMI-SDS. Conclusions The mean irisin levels were higher in patients with CPP compared with other groups. The results of this study imply that increased irisin levels may be used as a marker of CPP provided that these findings are confirmed in larger prospective studies.

scholarly journals Influence of Meteorological Parameters on the Variations of Atmospheric Radionuclides Concentration in Dar es Salaam, Tanzania

2020 ◽  
pp. 1-18
Author(s):  
Dorice Rashid Seif ◽  
Yusuf Ismail Koleleni
Keyword(s):  
Regression Analysis ◽  
Meteorological Parameters ◽  
Activity Concentration ◽  
Absolute Humidity ◽  
Dar Es Salaam ◽  
The Other ◽  
Atmospheric Conditions ◽  
Activity Concentrations ◽  
The Mean ◽  
Atmospheric Concentrations

Atmospheric concentrations of 7Be and 212Pb were measured for 11 years (2008 – 2018) in Dar es Salaam, Tanzania. The mean activity concentrations of 7Be and 212Pb were found to be within the range of 1.29 – 5.71 mBq/m3 and 10.85 – 50.06 mBq/m3, respectively. The annual mean activity concentrations of 7Be and 212Pb were 4.72 ± 1.18 mBq/m3 and 29.76 ± 13.63 mBq/m3, respectively. Distinct annual trends were depicted on 7Be and 212Pb, suggesting that the two radionuclides were affected differently with atmospheric conditions. Monthly atmospheric concentrations of 7Be showed a strong seasonal variation trend with the highest in January and February and lowest in April. 212Pb depicted the highest concentration during June and July and lowest in January and December. The regression analysis for 7Be and 212Pb activity concentrations together with number of meteorological parameters revealed that the relative humidity, rainfall, air temperature, absolute humidity and wind speed are the most significant parameters affecting radionuclides activity concentrations in the atmosphere. The sunspot numbers show 66.7% of its variability with 7Be activity concentration which further suggesting that other parameters may influence its variation. 212Pb, on the other hand, shows only 27.3% of its variability which clearly indicates that the existence of cosmic rays does not affect its activity concentration in the atmosphere.

Parental Loss in Homosexuals

1969 ◽  
Vol 115 (520) ◽  
pp. 319-320 ◽  
Author(s):  
P. A. P. Moran ◽  
K. Abe
Keyword(s):  
Regression Analysis ◽  
General Population ◽  
Maternal Age ◽  
Indirect Method ◽  
The Other ◽  
Paternal Age ◽  
Parental Loss ◽  
The Mean ◽  
Male Homosexuals

In a previous paper (Abe and Moran, 1969) we analysed observed increases in paternal and maternal ages in 291 male homosexuals admitted to the out-patient or in-patient departments of the Bethlem Royal and Maudsley Hospitals during 1949–1960. It was shown that the mean mothers’ age of these patients was 2.31 years greater than would be expected in the general population after taking account of the years of birth of the patients. The similar shift in mean paternal age, using an indirect method of calculating the expectation, was between 3.15 and 3.55 years. On carrying out an approximate regression analysis of each of these shifts on the other it was shown that the shift in maternal age could be completely explained as an effect due to a shift in paternal age, but not vice versa.

Evaluation of the performance of sweet potato genotypes by joint regression analysis

1991 ◽  
Vol 117 (2) ◽  
pp. 171-176
Author(s):  
J. M. Ngeve
Keyword(s):  
Regression Analysis ◽  
Sweet Potato ◽  
Soil Type ◽  
The Other ◽  
Human Consumption ◽  
Regression Analyses ◽  
Specific Adaptation ◽  
Regression Slopes ◽  
Joint Regression Analysis ◽  
Linear Regressions

SUMMARYTwo experiments, each involving a set of six sweet potato clones, the first set developed in sites differing in altitude, and the second in sites differing in soil type, were done at three locations in 4 years in Cameroon. Data obtained were subjected to analyses of variance to determine the presence of genotype × environment (G × E) interactions, and to joint regression analyses to measure the performance of clones across environments. The first experiment produced higher yields and contained more stable clones than the second. In both experiments, mean yields were almost twice as high in 1984 (21·1 t/ha) as in each of the other years (c. 11·0 t/ha), and highest at Nyombe (18·0 t/ha). In Expt 1, the G × E interaction mainly concerned interaction with location, whereas in Expt 2 it concerned interaction with years.Clones 1611 (Expt 1) and 048 (Expt 2) yielded above average and gave linear regressions significantly above unity (b > 1·0) for most traits, indicating specific adaptation to high-yielding environments and hence below average stability. Clones 1112, 1639 and TIbl (Expt I) yielded above average and had regression slopes equal to unity (b = 1·0), indicating average stability and thus general adaptability. Clones TIb2 (Expt 1) and 1487 (Expt 2) produced below average yields (b < 1·0), indicating specific adaptation to low-yielding environments. Since sweet potato is grown mainly for human consumption in Cameroon, a preferred clone must have stable marketable yields. Only clones 1112, TIbl and 1639 could be considered desirable for release to growers.

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