نتایج جستجو برای: birth and growth rates
تعداد نتایج: 16967846 فیلتر نتایج به سال:
Birth-death processes take place ubiquitously throughout the universe. In general, birth and death rates depend on system size (corresponding to number of products or customers undergoing birth-death process) thus vary every time occurs, which makes fluctuations in inevitable. The differential-difference equation governing evolution such a process is well established, but it resists solving for...
The data were collected from 1992 to 2009 in Burri, White Boni and Black Boni sheep maintained at the Regional Research Station in the Central Highlands of Yemen. Data were analyzed to study the effects of environmental and genetic factors on body weight and growth rate from birth to weaning. The least square means for body weights (BW) were 2.54, 2.18 and 2.26 kg for birth; 12.49, 10.58 and 11...
Customized birth weight percentiles are weight-for-gestational-age percentiles that account for the influence of maternal characteristics on fetal growth. Although intuitively appealing, the incremental value they provide in the identification of intrauterine growth restriction (IUGR) over conventional birth weight percentiles is controversial. The objective of this study was to assess the valu...
Introduction: Nowadays Low birth weight(LBW or birth weight<2500g) is one of the most serious problems among children around the world. The purpose of this study was to evaluate and compare the growth parameters(weight, height, head circumference and BMI) of LBW children at the age of five years with normal birth weight (NBW: birth weight: 2500- 4000 g) children. Methods: In a cross-sectional ...
All industrialized countries experienced a transition from high birth rates and stagnant standards of living to low birth rates and sustained growth in per capita income. What contributed to these transformations? Did economic and demographic changes transpire through common or distinct channels? We construct a general equilibrium model with endogenous fertility in order to quantitatively inves...
Background & Aims: Growth disorders are one of the important health problems of children in the world, particularly in developing countries. This Study was aimed to evaluate risk factors of growth disorders in children less than one year old in Salmas. Materials & Methods: This historical cohort study was carried out on 473 children who were born in Salmas city that were selected and foll...
BACKGROUND: Birth weight- and gestational age-specific perinatal mortality curves intersect when compared across categories of maternal smoking, plurality, race and other factors. No simple explanation exists for this paradoxical observation. METHODS: We used data on all live births, stillbirths and infant deaths in Canada (1991-1997) to compare perinatal mortality rates among singleton and twi...
objective: the objective of this study was to investigate the invitro fluoride release of four new self-adhesive resin cements; set (sdi, australia), breeze (pentron, usa), embrace wetbond (pulpdent, usa), g-cem (gc, japan) and to assess the bonding performance of these self-adhesive resin cements for bonding of orthodontic brackets. materials and methods: for fluoride release experiment, six ...
Effects of salt stress on growth rate and ion content of 17 bread wheat (Triticum aestivum L.) cultivars grown in a hydroculture media under normal (0 ds/m) and salt stress (8 ds/m) conditions were examined during a period of 14 days in an experiment conducted at the greenhouse of Shahid Bahonar University of Kerman. Cultivars of Shiraz and Gascogen showed the highest and lowest root growth rat...
this is an original study on the effect of a polyisobutylene – polydimethylsiloxane (pibpdms) block copolymer modifier used as an interfacial active agent on the dynamics behaviour of single newtonian drops suspended in a polyisobutylene (pib) newtonian matrix. the results were divided in two sections. the first part included the experiments carried out on the non-modified and 2% block cop...
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