The microdetermination of sulfur with an automatic elemental analyzer

Culmo, Robert

doi:10.1016/0026-265x(72)90087-2

Cited by 19 publications

(3 citation statements)

References 7 publications

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“…All of the 30-day fetuses were combined into one group for bomb calorimetry on fat-containing 120 tissues and three groups for fat-free tissues (same groups as for fat extraction). Aliquots of fat-free tisues were analyzed for loo carbon and nitrogen using an automatic elemental analyzer in conjunction with Midwest Microlabs, Ltd. (Indianapolis, IN) (3)(4)(5). Precision of this elemental analysis was +0.3%.…”

Section: Materials a N D Methodsmentioning

confidence: 99%

Composition of the Fetal and Maternal Guinea Pig throughout Gestation

Engle

Lemons

1986

Pediatr Res

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ABSTRACT. The guinea pig is a small animal species in which the conceptus constitutes a large proportion of maternal weight a t term, thereby imposing a major metabolic demand on the mother during pregnancy. In addition the neonatal fat concentration is similar to the human making the guinea pig an interesting model for comparative physiologic study. The purpose of our study was to describe the fetal and maternal physical/chemical growth characteristics of the Hartley albino guinea pig throughout the latter half of gestation. Forty-eight pregnant adult and 122 fetal guinea pigs were sacrificed a t intervals throughout gestation and the carcasses analyzed for a variety of growth parameters. The fetal growth rate during the last 8 days of gestation (5.8 g/day) was 9.7 times faster than from 30 to 40 days of gestation (0.6 g/day). The fetal mass comprised 55.4% of the maternal weight gain a t term. Fetal energy increased from 403 cal/g a t 30 days to 1950 cal/g a t term and was paralleled by an increase in fetal fat concentration from 0.3 to 9.8% (wet weight). Nitrogen concentration increased from 0.9% wet weight a t 30 days to 2.6% a t term. An increasing carbon concentration and carbon:nitrogen ratio was also evident. Fetal water concentration declined from 91.6 to 67.8% during latter gestation. On a wet weight basis, the concentration of fetal sodium remained stable throughout the latter half of pregnancy; potassium, magnesium, iron, calcium, and phosphorus concentrations increased. In contrast to the changes in fetal composition, maternal energy, fat, protein, water, sodium, potassium, calcium, phosphorus, magnesium, and iron concentrations remained relatively constant throughout pregnancy. Therefore, close parallels exist between the guinea pig fetus and human fetus with respect to rates of weight gain a s well a s energy, fat, protein, water, sodium, calcium, and phosphorus composition. Although dissimilar from the human fetus in respect to potassium, magnesium, iron and "chemical maturity," the fetal guinea pig may be a good model for the study of fetal and perinatal fat matabolism. (Pediatr Res 20: 1156-1 160,1986 During the past decade a number of animal species has been studied with regard to basic metabolic requirements for fetal growth (1). Rather than finding large differences among the various species, remarkable similarities have been identified. As an example, oxygen consumption rates in adult mammals that differ widely in size (guinea pig, rhesus monkey, sheep, cattle, and horse) vary from 2.0 to 9.7 ml/kg/min; in contrast, the fetuses of these species have similar rates of oxygen consumption, 6 to 8.5 ml/kg/min.

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Section: Materials a N D Methodsmentioning

confidence: 99%

Composition of the Fetal and Maternal Guinea Pig throughout Gestation

Engle

Lemons

1986

Pediatr Res

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“…Therefore, the optimal temperature of the Cu layer, providing a stoichiometric conversion of sulphur into SO2 is 850 ~ a conclusion earlier indicated in another report [61]. An important conclusion from those studies is that cupric oxide reacts irreversibly with sulphur oxides at temperatures lower than 840 ~ it leads to a negative error of determinations.…”

Section: Automatic Determination Of Sulphur By Gas Chromatographymentioning

confidence: 66%

“…Usually, tungsten trioxide is employed at a temperature of about 1000 ~ [61]. Usually, tungsten trioxide is employed at a temperature of about 1000 ~ [61].…”

Section: Automatic Determination Of Sulphur By Gas Chromatographymentioning

confidence: 99%

Automated determination of sulphur in organic compounds

Kaczmarek

Gondko

1986

Mikrochim Acta

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The paper reviews methods of sulphur determination over the last 120 years. Classical methods are presented in a historical view, and the present state of automatic procedures of sulphur estimation is discussed. 104 key references concerning sulphur analysis are cited. On the basis of the present level of the development of elemental analysis, a prognosis of directions of the development of sulphur microanalysis is attempted.

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Classical and rapid methods of analysis

Potts

1987

A Handbook of Silicate Rock Analysis

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The microdetermination of sulfur with an automatic elemental analyzer

Cited by 19 publications

References 7 publications

Composition of the Fetal and Maternal Guinea Pig throughout Gestation

Composition of the Fetal and Maternal Guinea Pig throughout Gestation

Automated determination of sulphur in organic compounds

Classical and rapid methods of analysis

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