Growth and Development of Pouch Young of Wild and Captive Dasyurus-Geoffroii (Marsupialia, Dasyuridae)

1988 ◽  
Vol 36 (5) ◽  
pp. 533 ◽  
Author(s):  
M Serena ◽  
TR Soderquist
Keyword(s):  
Growth Rates ◽  
Growth And Development ◽  
Head Width ◽  
Square Root ◽  
Crown Rump Length ◽  
Medium Weight

Growth and development of six captive litters of D. geoffroii were monitored at 1-5 day intervals from birth until they were left in dens at about 62-72 days of age. Two neonates were 4.4 mm long and weighed an average 11 mg. By the age of 63 days, juvenile weight had increased 1500-fold, to an average of 16.7 g. Growth of crown-rump length (from 0-40 days) and the square root of head width (from 8-65 days) is linear with respect to time. Wild D. geoffroii were first observed to be left in dens at the age of 62 days, soon after outgrowing the pouch. Wild and captive growth rates appear similar through the first half of pouch life. At older ages, wild litters generally grew more slowly than captive litters; wild litters belonging to thin mothers grew more slowly than litters with medium-weight mothers, which in turn grew more slowly than litters with fat mothers.

Growth and development of pigs: a reanalysis of the effects of nutrition on body composition

1983 ◽  
Vol 100 (3) ◽  
pp. 681-687 ◽  
Author(s):  
A. S. Davies
Keyword(s):  
Body Composition ◽  
Head And Neck ◽  
Growth Rates ◽  
Growth And Development ◽  
Fat Content ◽  
The Body ◽  
Total Weight ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Poor Nutrition

SUMMARYSelected data of McMeekan (1940, 1941) were reanalysed to compare the proportions and distribution of tissues, and the weights of some organs, in pigs growing at different growth rates due to differing levels of nutrition. The effects of variation in fat content were excluded, and the distribution of tissues was compared at the same total weight for each tissue, by allometric regressions. Except for components of the head and neck, and the stomach, the results do not support a concept of retardation of development by poor nutrition of those parts of the body with the highest relative growth rates.

Teratogenicity of Staphylococcus aureus L-forms using a mouse whole-embryo culture model

2013 ◽  
Vol 62 (5) ◽  
pp. 677-682
Author(s):  
Yong Liu ◽  
Xiang Zhu ◽  
Feng-ling Yu ◽  
Xiao-ming Kong ◽  
Na Lin ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Growth And Development ◽  
Mouse Embryos ◽  
Head Length ◽  
Control Group ◽  
Whole Embryo Culture ◽  
Crown Rump Length ◽  
Gram Staining ◽  
Pass Through

Our previous studies have suggested that Staphylococcus aureus L-forms are able to pass through the placental barrier of mice from the maternal side to the fetal body and affect fetal growth and development, but little is known about the direct influence of S. aureus L-forms on embryos during the critical period of organogenesis. Mouse embryos at gestational day 8.5 were cultured in vitro for 48 h with 0, 50, 100, 200 or 400 c.f.u. S. aureus L-forms ml−1. At the end of the culture period, the mouse embryos were assessed morphologically for viability, growth and development. Bacteriological and immunohistochemical staining were used to determine the existence of S. aureus L-forms in embryonic tissues. We found that both crown–rump length and head length of mouse embryos exposed to S. aureus L-forms at a concentration of 50 c.f.u. ml−1 were reduced. When the mouse embryos were exposed to 100, 200 or 400 c.f.u. S. aureus L-forms ml−1, the total morphological score, number of somites, dry embryo weight, yolk sac diameter, crown–rump length and head length were significantly lower than those of the control group. With the increased concentration of S. aureus L-forms in the culture medium, there were fewer normally developed embryos and more embryos with abnormalities or retardation in growth. S. aureus L-forms detected by Gram-staining and immunohistochemical detection of antigen were found in the tissues of embryos infected by S. aureus L-forms. These data suggest that S. aureus L-forms exert a direct teratogenic effect on cultured mouse embryos in vitro.

Allometric Models of Simuliid Growth Rates and Their Use for Estimation of Production

1988 ◽  
Vol 45 (2) ◽  
pp. 315-324 ◽  
Author(s):  
Antoine Morin ◽  
Michel Constantin ◽  
Robert Henry Peters
Keyword(s):  
Water Temperature ◽  
Significant Influence ◽  
Growth Rates ◽  
Dry Mass ◽  
Published Data ◽  
Power Relationship ◽  
Square Root ◽  
Allometric Model ◽  
Simulium Vittatum ◽  
Individual Mass

Growth rates of Prosimulium mixtum/fuscum, Stegopterna mutata, and Simulium vittatum are described in relation to individual mass, water temperature, and seston quality in the outlet of Lake Orford (southern Quebec) in the winter of 1985–86. Growth rates in mass (G, per day) of the three species were similar and inversely related to dry mass (DM, micrograms) following the power relationship G = 0.11 DM−0.28; neither water temperature nor seston abundance and quality varied sufficiently during the study period to have a significant influence on growth rates. The allometric model was used to estimate production of the three species, and the resulting estimates are compared with cohort methods and size–frequency estimates. Large larvae were responsible for most of the production, and most of the production occurred before the spring rise in water temperature. Measured growth rates in winter are significantly lower than those reported for simuliids in warmer waters. A reanalysis of published data shows that growth rates of simuliids increase as the square root of water temperature (T, degrees Celsius) (G = 0.08 DM−0.21 T0.48).

scholarly journals The Survival and Growth Rates of Woody Vegetation in the Man-Made Radějov Biocorridor During the Period of 1993 - 2012

2014 ◽  
Vol 6 (2) ◽  
pp. 88-117
Author(s):  
Boleslav Jelínek ◽  
Luboš Úradníček
Keyword(s):  
Czech Republic ◽  
Growth Rates ◽  
Woody Plants ◽  
Growth And Development ◽  
Agricultural Land ◽  
Woody Vegetation ◽  
The Czech Republic ◽  
Survival And Growth ◽  
The Given ◽  
Trees And Shrubs

AbstractThe first biocorridors were established in the territory of the Czech Republic in the 1990s. One of them, planted on a former agricultural land, was the Radějov biocorridor. This paper deals with the growth and development of trees and shrubs on three permanent research plots in 1993 - 2012. Repeated inventories of trees as well as monitoring of their biometrical parameters were carried out in both tree and shrub layers. The number of trees decreases with the increasing level of stand canopy. Moreover, mean heights, diameters and crown projection areas of selected woody plants were compared. Under the given conditions, the growth of these woody plants can be positively evaluated.

Interrelations in the growth and development of Lolium. I. Some effects of vernalization on growth and development

1965 ◽  
Vol 16 (6) ◽  
pp. 903 ◽  
Author(s):  
JH Silsbury
Keyword(s):  
Low Temperature ◽  
Growth Rates ◽  
Growth And Development ◽  
Growth Curves ◽  
High Growth ◽  
Reproductive Development ◽  
Controlled Environment ◽  
Lolium Rigidum ◽  
Vegetative Phase ◽  
Reproductive Phase

The responses of Lolium rigidum Gaud. and L. perenne L. to low temperature seed vernalization were determined by comparing the growth and development of vernalized and unvernalized plants raised in the field and in a controlled environment cabinet. Vernalization did not appear to influence growth in the vegetative phase, but usually induced earlier heading and a greater proportion of reproductive tillers. Comparisons of vernalized (reproductive) and unvernalized (vegetative) plants show increased reproductive development to be associated with higher growth rates, lower tillering, and greater weight per tiller. High growth rates during the reproductive phase are considered to be due to the ability of reproductive tillers to grow more rapidly than vegetative tillers through the growth of true stem functioning as a "sink" for assimilate. Generalized growth curves for vernalized and unvernalized ryegrass grown under long days are presented and discussed.

On “how to start a fire”, or transverse forced-convection, hyperbaric laser chemical vapor deposition of fibers and textiles

2014 ◽  
Vol 84 (18) ◽  
pp. 1976-1986
Author(s):  
James L Maxwell ◽  
Nicholas Webb ◽  
Douglas Bradshaw ◽  
Marcie R Black ◽  
Karlene Maskaly ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Critical Temperature ◽  
Flow Velocity ◽  
Flow Rate ◽  
Growth Rates ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Forced Flow ◽  
Square Root ◽  
Laser Chemical Vapor Deposition

This work explores the transverse forced flow of precursor gases during hyperbaric pressure laser chemical vapor deposition (HP-LCVD). Axial and mass growth rates of carbon fibers are measured experimentally, and a numerical model is developed that provides fiber growth rates in both the mass-transport-limited (MTL) and kinetically limited (KL) regimes. It is found that the fiber’s transport-limited rate increases as the square root of the flow velocity, while simultaneously, the temperature drops with the inverse square root of the flow velocity. Growth is enhanced by forced flow so long as the reaction zone remains within the MTL regime; upon reaching a critical temperature and flow rate, however, fibers enter the KL regime, and the growth rate declines with rising flow rate. Molecular properties of the precursors employed and gas concentrations ultimately determine the range of the MTL and the locations of the critical temperature and flow rate. The growth rates of fibers can indeed be enhanced by transverse forced convection—to at least three times the zero-flow steady-state rate, provided an MTL regime exists. Complex three-dimensional structures may be grown from these fibers in a freeform manner, and the more rapidly such microstructures can be fabricated, the more practical HP-LCVD becomes for industrial use, including the fabrication of novel textiles.

Factors influencing macular atrophy growth rates in neovascular age-related macular degeneration treated with ranibizumab or aflibercept according to an observe-and-plan regimen

2018 ◽  
Vol 103 (7) ◽  
pp. 900-905 ◽  
Author(s):  
Irmela Mantel ◽  
Marta Zola ◽  
Sophie De Massougnes ◽  
Ali Dirani ◽  
Ciara Bergin
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Pigment Epithelium ◽  
Age Related Macular Degeneration ◽  
Square Root ◽  
Factors Associated ◽  
Macular Atrophy ◽  
Age Related ◽  
Lower Baseline ◽  
Fellow Eyes

Background/aimsTo investigate the factors associated with macular atrophy (MA) growth rates in neovascular age-related macular degeneration treated with either ranibizumab or aflibercept.MethodsWe obtained data from two identical prospective studies using ranibizumab or aflibercept under observe-and-plan variable dosing regimens. We analysed eyes that presented MA within 2 years. After applying square root transformations to MA sizes, we calculated MA growth rate from baseline to the year 2 endpoint and used univariate and multivariate analyses to detect ocular and treatment factors associated with the MA growth rate.ResultsIncluded were 109 eyes from 101 patients (mean age 80.6 years). The mean square-root-transformed MA growth rate was 0.54±0.34 mm/year. The univariate analyses revealed that MA growth rates were significantly associated with lower baseline visual acuities (p=0.001) and thicker subretinal tissue complexes (p=0.006) and near-significantly associated with the presence of pigment epithelium detachment (p=0.057) and choroidal neovascularisation subtypes (p=0.069). Our multivariate analysis confirmed the significance of lower baseline visual acuities (p=0.008) and pigment epithelium detachments higher than 200 µm (p=0.035). Furthermore, MA growth rates in neovascular eyes significantly correlated with MA growth rates in non-neovascular fellow eyes (n=61; p=0.003).ConclusionMA growth rates were associated with ocular factors in the study eyes and the fellow eyes but not with the drug or the number of injections within this variable dosing regimen.

The peanut gynophore: a developmental and physiological perspective

2003 ◽  
Vol 81 (3) ◽  
pp. 183-190 ◽  
Author(s):  
Edgar Moctezuma
Keyword(s):  
Acetic Acid ◽  
Arachis Hypogaea ◽  
Growth Rates ◽  
Growth And Development ◽  
Plant Hormone ◽  
Physiological Changes ◽  
Light Touch ◽  
Peanut Plant ◽  
Arachis Hypogaea L ◽  
Indole 3 Acetic Acid

The peanut plant (Arachis hypogaea L.) produces flowers aerially, but it is able to "sow" its own seeds as a result of the growth of a specialized organ called the gynophore. The peanut gynophore is sensitive to light, touch, and gravity, and it is capable of transporting the recently fertilized ovules into the soil. For gynophore growth to occur, many physiological changes in plant hormone accumulation and distribution take place throughout its development. The unique characteristics and physiological events occurring during the gynophore's growth and development, such as its growth rates and indole-3-acetic acid redistribution during gravistimulation, will be reviewed. The peanut gynophore illustrates that the study of the odd or unusual can often provide valuable answers about the typical.Key words: Arachis hypogaea, geocarpy, gravitropism, gynophore, indole-3-acetic acid (IAA), peanut.

The life history, nymphal growth rates, and feeding habits of Siphlonisca aerodromia Needham (Ephemeroptera: Siphlonuridae) in Maine

1986 ◽  
Vol 64 (2) ◽  
pp. 427-430 ◽  
Author(s):  
K. Elizabeth Gibbs ◽  
Terry M. Mingo
Keyword(s):  
Growth Rate ◽  
Life History ◽  
Sex Ratio ◽  
Growth Rates ◽  
Feeding Habits ◽  
Main Channel ◽  
Head Width ◽  
Snow Melt ◽  
Animal Material ◽  
Nymphal Growth

Siphlonisca aerodromia Needham has a univoltine life history in Maine. Adults emerge in late May or early June. Each female contains about 394 large (0.46 mm long) eggs covered with coiled fibers that anchor the eggs to the substrate. Eggs are deposited in the main channel of the stream and small nymphs appear in January. Nymphal growth rate (GHW) was expressed as a percent per day increase in head width. Initially nymphs feed on detritus and grow slowly (GHW = 0.28–0.79) at water temperatures near 0 °C. Following snow melt, the nymphs move into the adjacent Carex floodplain. Here, water temperature increases, animal material, in the form of mayfly nymphs, becomes increasingly common in the diet, and growth rate increases (GHW = 2.13–2.89). The sex ratio of nymphs collected in May and June was 1:1.8 (male:female).

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