Relating Growth Rate to Environmental Factors—Methodological Problems in the Study of Growth-Infection interaction

1989 ◽  
Vol 78 (s350) ◽  
pp. 14-20 ◽  
Author(s):  
T. J. COLE
Keyword(s):  
Growth Rate ◽  
Environmental Factors ◽  
Methodological Problems ◽  
Infection Interaction

scholarly journals The rooting, survival and growth of woody species on tailing dumps in the limestone quarry “Lafarge ciment”

2021 ◽  
Vol 13 (1(22)) ◽  
pp. 34-42
Author(s):  
Petru Cuza ◽  
◽  
Corina Certan ◽  
Constantin Bulimaga ◽  
◽  
...  
Keyword(s):  
Growth Rate ◽  
Environmental Factors ◽  
Slow Growth ◽  
Woody Species ◽  
Mineral Elements ◽  
Black Pine ◽  
Limestone Quarry ◽  
Survival And Growth ◽  
High Degree ◽  
Fast Growing Species

The rooting, the survival and dynamics of growths in the height and after the diameter of the seedlings, of a range of woody species, had investigated on the freshly formed sterile dump limestone quarry „Lafarge Ciment”. The seedlings of the woody species had a relatively good rooting (69-99%). A high degree of rooting can be ensured as a result of the maintenance of forest crops. After planting, the young seedlings must be cared for by hoeing as many times as necessary in order to control the weeds and maintain moisture in the soil, which increases the survival of the seedlings. Tree species have been characterized by a different growth rate. Acacia has showed a very rapid increase in height, but the black pine has been characterized by a slow growth. Acacia being a fast-growing species and unpretentious to the mineral elements in the soil can be used to afforest the limestone quarry land. In the fi rst year after planting, the young seedlings, otherwise sensitive to the action of the environmental factors, had an increase in height and in diameter slow and uneven. In the years that followed, the seedlings became more viable and less infl uenced by local and temporal fl uctuations of environmental factors.

scholarly journals Phytoremediation of Special Metals in Emerging Industries

2018 ◽  
Vol 1 (3) ◽  
Author(s):  
T Y TEH ◽  
Min-Hao Wu ◽  
Kf Chen ◽  
Yp Peng
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Growth Rate ◽  
Environmental Factors ◽  
Contaminated Soil ◽  
Morphological Analysis ◽  
Energy Crop ◽  
Emerging Industries ◽  
Incremental Growth ◽  
Conventional Methods

This project is carried out to assess the remediation effect on soil contaminated by molybdenum (Mo), one of heavy metals, through the use of an energy crop, sunflowers. This project explores the integration of phytohormones and chelates in the phytoremediation of soils contaminated by heavy metals, and further assesses the operational measures of remedying heavy-metal contaminated soil with sunflowers, in addition to the related environmental factors. Then the project explores phytohormones and heavy metals on the growth scenario explants (explants morphological analysis) through the experiment. The results indicate that GA3 can increase the growth rate of the plants. The average incremental growth of the heavy-metal-added-only group is 21.0 cm; of the GA3-added group it is 21.9 cm; of the EDDS-added group, it is 20.3 cm; of the GA3+ EDDS-added group, it is 21.7 cm. Compared with the conventional methods of phytoremediation, these integrated measures can actually spur the growth of plants. 

scholarly journals Experiments on some effects of certain environmental factors on Gracilaria verrucosa (Hudson) Papenfuss

1959 ◽  
Vol 38 (1) ◽  
pp. 153-167 ◽  
Author(s):  
W. Eifion Jones
Keyword(s):  
Growth Rate ◽  
Environmental Factors ◽  
High Intensity ◽  
Laboratory Experiments ◽  
Early Stage ◽  
Wave Action ◽  
Marine Organisms ◽  
Gracilaria Verrucosa ◽  
The Church

At an early stage of an autecological study of Gracilaria verrucosa (Hudson) Papenfuss it seemed possible that the best growth of the plants occurred in places, such as the Achill Sound and the Church Island Channel in the Menai Straits, where, in the absence of heavy wave action, strong currents flowed over the plants. Experiments were carried out, in the sea, to investigate the effect of currents on the growth rate; the apparatus used and described here would probably be suitable for the investigation of current effects on other sedentary marine organisms.These experiments also led to some observations on the effects of illumination on the pigmentation and growth rate of the plants which were supplemented by laboratory experiments. High intensity illumination in the laboratory also demonstrated positive phototropism in the plant.

scholarly journals Effects of daily handling and other factors on weight gain of mice from birth to six weeks of age

1969 ◽  
Vol 3 (1) ◽  
pp. 7-16 ◽  
Author(s):  
G. Porter ◽  
M. Festing
Keyword(s):  
Growth Rate ◽  
Weight Gain ◽  
Environmental Factors ◽  
Environmental Factor ◽  
Rapid Growth ◽  
Short Term ◽  
Rate Of Growth

The results of this experiment show that growth rate in mice is so sensitive to environmental factors that any change in the environment such as handling or diet could cause short-term changes in the rate of growth. It is also shown that if there is a period of restricted growth due to an environmental factor such as either handling or diet, this may be followed by a period of compensating rapid growth.

scholarly journals Consequences of prenatal and preweaning growth for yield of beef primal cuts from 30-month-old Piedmontese- and Wagyu-sired cattle

2009 ◽  
Vol 49 (6) ◽  
pp. 468 ◽  
Author(s):  
P. L. Greenwood ◽  
L. M. Cafe ◽  
H. Hearnshaw ◽  
D. W. Hennessy ◽  
S. G. Morris
Keyword(s):  
Growth Rate ◽  
Environmental Factors ◽  
Tissue Distribution ◽  
Early Life ◽  
Low Birthweight ◽  
Carcass Weight ◽  
Whole Body ◽  
Target Market ◽  
Subsequent Growth

Cattle sired by Piedmontese or Wagyu bulls were bred and grown within pasture-based nutritional systems followed by feedlot finishing. Effects of low (mean 28.6 kg, n = 120) and high (38.8 kg, n = 120) birthweight followed by slow (mean 554 g/day, n = 119) or rapid (875 g/day, n = 121) growth to weaning on beef primal cut weights at ~30 months of age were examined. Cattle of low birthweight or grown slowly to weaning had smaller primal cuts at 30 months as a result of reduced liveweight and smaller carcasses compared with their high birthweight or rapidly grown counterparts. Hence they require additional nutritional and economic inputs to reach target market weights. At equivalent carcass weights (380 kg), cattle restricted in growth from birth to weaning yielded slightly more beef and were somewhat leaner than their rapidly grown counterparts, resulting in primal cuts being up to 4% heavier in the slowly grown compared with the rapidly grown cattle. Compositional differences due to birthweight were less apparent at the same carcass weight, although low birthweight cattle had a slightly (~2%) heavier forequarter and slightly lower (~1%) hindquarter retail yield, and less shin-shank meat (~2%) than high birthweight cattle, suggesting only minor effects on carcass tissue distribution. There were few interactions between sire genotype and birthweight or preweaning growth, and interactions between birthweight and preweaning growth were not evident for any variables. However, variability between cohorts in their long-term responses to growth early in life suggests other environmental factors during early-life and/or subsequent growth influenced carcass yield characteristics. Overall, this study shows that effects of birthweight and preweaning growth rate on carcass compositional and yield characteristics were mostly explained by variation in carcass weight and, hence, in whole body growth to 30 months of age.

scholarly journals Genetical and environmental factors affecting slaughter traits in beef production experiments in field

1983 ◽  
Vol 55 (6) ◽  
pp. 555-570
Author(s):  
Hilkka Kenttämies
Keyword(s):  
Growth Rate ◽  
Environmental Factors ◽  
Carcass Traits ◽  
Carcass Weight ◽  
Dairy Herds ◽  
Beef Production ◽  
Factors Affecting ◽  
Heritability Estimates ◽  
High Level

During the years 1971-77 the carcass weight of fattening calves delivered from dairy herds increased by 40kg. During the same period the differencies between areas grew smaller. The growth rate and carcass traits were affected by feed type of the farm, rearing time, sex of the calf and breed of sire. In comparison with the Ayrshire bulls, the carcass weight of contemporary Charolais bulls was 16 and of Friesian 12%-units higher, but of Finncattle bulls 7%-units lower. Differencies between heifers were still larger. The growth rate of Ch and Fr remained on a high level longer than that of Ay and Fc. The heritability estimates of Ay and (Fr) were .23 (.61) for carcass weight,.39 (.77) for net growth, .14 (.15) for carcass score and .06 (.26) for fatness score. Differencies between farms within feed type consisted of about 50 % of the variation in growth rate and carcass weight, and about 25 % in carcass scores. Feeding was more consistent on farms with mere indoor feeding than on farms where the animals were also kept on pasture.

scholarly journals Green TFP Heterogeneity in the Ports of China’s Pilot Free Trade Zone under Environmental Constraints

2021 ◽  
Vol 18 (24) ◽  
pp. 12910
Author(s):  
Zongbiao Hu ◽  
Feng Lan ◽  
Han Xu
Keyword(s):  
Growth Rate ◽  
Environmental Factors ◽  
Free Trade ◽  
Free Trade Zone ◽  
Average Annual Growth Rate ◽  
Annual Growth ◽  
Pollutant Emissions ◽  
Annual Growth Rate ◽  
Environmental Constraints ◽  
Tfp Growth

In the context of China’s Pilot Free Trade Zone (FTZ), ports have a new opportunity to realize high-quality development. Based on the analysis of the current situation of pollutant emissions from ports in China’s Pilot Free Trade Zones (FTZs), this paper introduces environmental factors into the analysis framework of the total factor productivity (TFP) of ports in China’s FTZs, and uses the Global Malmquist–Luenberger index method to analyze the evolution trend and heterogeneity of green TFP in 28 ports of China’s 19 FTZs from 2011 to 2017. The results show that firstly, the emissions of sulfur dioxide (SO2), nitrogen oxides (NOX) and other pollutants in China’s FTZs have been decreasing year by year. Secondly, both the green TFP and the traditional TFP of the ports in FTZs are on the rise. The absence of environmental factors leads to the underestimation of the TFP of ports. For the green TFP, the main source of its growth is technological progress. Thirdly, there is obvious port heterogeneity in the green TFP of FTZ ports. Nanjing Port has the highest green TFP growth rate, with an average annual growth rate of 21.95%. Ningbo Port, which ranks 14th, has an average annual growth rate of 5.46%. Fuzhou Port, which is rated last, has negative growth. Fourthly, there is also obvious types and regional heterogeneity in the green TFP of FTZ ports. When categorized by type, the average annual growth rate of green TFP in inland ports is significantly higher than that of coastal ports. When categorized by region, the descending order of the average annual growth rate of green TFP is the western region, the eastern region and the central region. Fifthly, the green TFP differences among the eastern, central, and western regions, as well as between inland ports and coastal ports, are shrinking. Moreover, the green TFP differences within inland ports and coastal ports and within central ports and eastern ports are also shrinking, implying there may be σ convergence. The conclusions of this paper have important implications for the scientific understanding of the heterogeneity of green TFP growth in ports in China’s FTZs, and how to promote the green development of ports in China’s FTZs under environmental constraints.

Significant Research Findings in the Etiology of Child Abuse

1984 ◽  
Vol 65 (6) ◽  
pp. 337-346 ◽  
Author(s):  
Susan L. Smith
Keyword(s):  
Child Abuse ◽  
Environmental Factors ◽  
Personality Factors ◽  
Significant Research ◽  
Research Findings ◽  
Methodological Problems ◽  
Further Development

Three variables—the role of the child, the psychological/personality factors of the parent, and sociological-environmental factors—are used as bases for analyzing current findings. The analysis indicates methodological problems and the need for further development of knowledge.

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