Kjeldahl Method for Total Nitrogen

Kirk, Paul L.

doi:10.1021/ac60038a038

Cited by 464 publications

(201 citation statements)

References 19 publications

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“…For all horizons it was determined: (i) active and potential soil reaction (1N KCl), exchangeable acidity (Al, H), basic characteristics of the sorption complex by Kappen (1929) (base content, hydrolytic acidity, cation exchange capacity, base saturation), (iii) total carbon content -Springer-Klee method (Ciavatta et al 1989), (iv) total nitrogen content by Kjeldahl (Kirk 1950), (v) plant available nutrients (P, K, Ca, Mg) by Mehlich III (Mehlich 1984).…”

Section: Methodsmentioning

confidence: 99%

Effects of silver fir (Abies alba Mill.) on the humus forms in Norway spruce (Picea abies (L.) H. Karst.) stands

Podrázský¹,

Vacek²,

Kupka³

et al. 2018

J. For. Sci.

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Podrázský V., Vacek Z., Kupka I., Vacek S., Třeštík M., Cukor J. (2018): Effects of silver fir (Abies alba Mill.) on the humus forms in Norway spruce (Picea abies (L.) H. Karst.) stands. J. For. Sci., 64: 245-250.The effects of silver fir (Abies alba Miller) on the soil compared to Norway spruce (Picea abies (Linnaeus) H. Karsten) were evaluated. Altitude of the study site is 790 m a.s.l., mild slope of 10° facing SW, forest site is spruce-beech on acid soil. The forest floor and top soil horizons (L + F1, F2 + H, Ah) were sampled in 4 replications beneath unmixed Norway spruce and silver fir groups. Comparing the soil-forming effects of both species, few significant differences were found in the Ah horizon -contents of total C, N, exchangeable Al and plant available Ca were higher beneath spruce. The soil improving role of silver fir compared to spruce was confirmed at the studied locality.

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Section: Methodsmentioning

confidence: 99%

Effects of silver fir (Abies alba Mill.) on the humus forms in Norway spruce (Picea abies (L.) H. Karst.) stands

Podrázský¹,

Vacek²,

Kupka³

et al. 2018

J. For. Sci.

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“…These 5 diets were made of 7 raw materials and the total protein percentages of these materials are shown in Table 1. These raw materials were selected because they were rich in protein content according to the Kjeldahl method (14) of determination of protein and were available in the study region. The 5 diets were then made by mixing different amounts of the raw materials as shown in Table 2.…”

Section: Proteinaceous Dietsmentioning

confidence: 99%

Influence of different proteinaceous diets on consumption, brood rearing,and honey bee quality parameters under isolation conditions

Amro¹,

Omar²,

Alghamdi³

2016

Turk J Vet Anim Sci

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“…Protein concentration of pollen was determined by micro-Kjeldahl analysis, which measures the amount of nitrogen (Kirk 1950). This titrimetric method is based on the mineralization of the pollen sample in H 2 SO 4 , leading to the release of the pollen nitrogen in a mineral form.…”

Section: Pollen Analysismentioning

confidence: 99%

Analysis of Pollen and Nectar of <I>Arbutus unedo</I> as a Food Source for <I>Bombus terrestris</I> (Hymenoptera: Apidae)

Rasmont¹,

Regali²,

Ings³

et al. 2005

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Abstract:The mineral, total amino acid, and sterol compositions of pollen collected by Apis mellifera L. were compared with the pollen of a plant consumed by Bombus terrestris (L.): Arbutus unedo L. This plant provides the predominant food resource for the main autumn generation of B. terrestris in southern France. Honey bees also forage on this plant, although only for nectar. The mineral composition of 30 pollen samples collected by honey bees is close to the presently known requirements of A. mellifera, except for Cu and Mn, which are substantially lower. The total amino acid mean composition of a set of 54 pollen samples fits the basic requirements of honey bees except for valine, isoleucine, and methionine, which are present in lower concentrations in all the samples. For pollen of A. unedo, the amino acid balance is not very different from that of the survey. The main sterolic component in pollen of A. unedo, β-sitosterol, is known to have antifeedant effects on A. mellifera. Honey bees cannot dealkylate C 29 sterols like β-sitosterol or 85-avenasterol to obtain C 27 cholesterol and ecdysteroids. Because these phytosterols as well as cholesterol are nearly absent from pollen of A. unedo, the metabolic capabilities of Apis seem unadapted to this plant. On the contrary, pollen of A. unedo is freely consumed by B. terrestris, which develops huge autumn populations solely on this food. These data indicate that the sterolic metabolisms of B. terrestris and A. mellifera differ, allowing separation in foraging activity.

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Kjeldahl Method for Total Nitrogen

Cited by 464 publications

References 19 publications

Effects of silver fir (Abies alba Mill.) on the humus forms in Norway spruce (Picea abies (L.) H. Karst.) stands

Effects of silver fir (Abies alba Mill.) on the humus forms in Norway spruce (Picea abies (L.) H. Karst.) stands

Influence of different proteinaceous diets on consumption, brood rearing,and honey bee quality parameters under isolation conditions

Analysis of Pollen and Nectar of <I>Arbutus unedo</I> as a Food Source for <I>Bombus terrestris</I> (Hymenoptera: Apidae)

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