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1,326 results on '"Pedersen, E B"'

1. Ptychographic X-ray computed tomography of extended colloidal networks in food emulsions

Author

Nielsen, M. S., Munk, M. B., Diaz, A., Pedersen, E. B. L., Holler, M., Bruns, S., Risbo, J., Mortensen, K., and Feidenhans'l, R.

Subjects
Condensed Matter - Soft Condensed Matter, Physics - Medical Physics
Abstract

As a main structural level in colloidal food materials, extended colloidal networks are important for texture and rheology. By obtaining the 3D microstructure of the network, macroscopic mechanical properties of the material can be inferred. However, this approach is hampered by the lack of suitable non-destructive 3D imaging techniques with submicron resolution. We present results of quantitative ptychographic X-ray computed tomography applied to a palm kernel oil based oil-in-water emulsion. The measurements were carried out at ambient pressure and temperature. The 3D structure of the extended colloidal network of fat globules was obtained with a resolution of around 300 nm. Through image analysis of the network structure, the fat globule size distribution was computed and compared to previous findings. In further support, the reconstructed electron density values were within 4% of reference values., Comment: 19 pages, 4 figures, to be published in Food Structure

Published
2016
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5. Prenatal exposure to airborne polychlorinated biphenyl congeners and male reproductive health

Author

Tøttenborg, S S, Hougaard, K S, Deen, L, Pedersen, E B, Frederiksen, M., Kofoed, A. B. B., Petersen, K. U., Meyer, H. W., Ebbehøj, N.E., Bonde, J P E, Tøttenborg, S S, Hougaard, K S, Deen, L, Pedersen, E B, Frederiksen, M., Kofoed, A. B. B., Petersen, K. U., Meyer, H. W., Ebbehøj, N.E., and Bonde, J P E

Abstract

STUDY QUESTION: Is fetal exposure to lower-chlorinated polychlorinated biphenyls (LC-PCBs) in indoor air of private homes built with PCB-containing materials associated with semen characteristics and testicular volume in adult men?SUMMARY ANSWER: We observed only marginal and inconsistent associations between maternal exposure to PCBs in indoor air and semen quality, testicular size and reproductive hormones in the adult offspring.WHAT IS KNOWN ALREADY: Recent studies have shown LC-PCBs to exhibit endocrine-disrupting properties and increase the risk of cryptorchidism. Although exposure to LC-PCBs in indoor air is relatively common, the long-term impact of prenatal exposure on male reproductive health has not yet been investigated.STUDY DESIGN, SIZE, DURATION: In this cohort study, participants were men (18+ years) whose mothers carried them while living in one of two residential areas where indoor air had been contaminated by LC-PCB evaporating from building materials in subsets of the apartments. Men were considered prenatally exposed if their mother had lived in a PCB-contaminated apartment and unexposed if their mother had lived in an uncontaminated apartment for a minimum of 1 year during the 3.6 years before conception or during the first trimester. Mothers of prenatally unexposed men could not have lived in a contaminated apartment at any point. Recruitment lasted from 2017 to 2019. In total, 73 exposed and 111 unexposed men gave a blood and semen sample.PARTICIPANTS/MATERIALS, SETTING, METHODS: Percentage differences in semen volume, sperm concentration, total sperm count, morphologically normal spermatozoa, progressively motile spermatozoa and DNA fragmentation index (DFI) between prenatally exposed and unexposed men were estimated using negative binomial regression. Associations with total and calculated free testosterone (CFT), LH and FSH were modeled using the linear regression. Odds of small testicular volume was estimated

Published
2022

41. Effect of water deprivation and hypertonic saline infusion on urinary AQP2 excretion in healthy humans

Author

PEDERSEN, R. S., BENTZEN, H., BECH, J. N., and PEDERSEN, E. B.

Subjects
Dehydration (Physiology) -- Research, Arginine -- Physiological aspects, Vasopressin -- Physiological aspects, Urine -- Analysis, Biological sciences
Abstract

Effect of water deprivation and hypertonic saline infusion on urinary AQP2 excretion in healthy humans. Am J Physiol Renal Physiol 280: F860-F867, 2001.--Arginine vasopressin (AVP) mediates water transport in the renal collecting ducts by forming water channels of aquaporin-2 (AQP2) in the apical plasma membrane. AQP2 is excreted in human urine. We wanted to test the hypothesis that urinary excretion of AQP2 (u-AQP2) reflects the effect of AVP on the renal collecting ducts during water deprivation and hypertonic saline infusion in healthy subjects. Fifteen healthy subjects underwent a 24-h period of fluid restriction. Urine and blood samples were collected at timed intervals. Fifteen healthy subjects were given 7 ml/kg 3% hypertonic saline infusion for 30 min. Urine and blood samples were collected at timed intervals. During fluid restriction, the u-AQP2 rate increased from 3.9 (25th percentile: 3.1; 75th percentile: 5.2) to 7.6 (5.9-9.1; P [is less than] 0.001) ng/min, and the plasma AVP (p-AVP) level increased from 0.5 (0.4-0.6) to 3 (1.7-3.3) pmol/l. There was a positive correlation between the maximum change in u-AQP2 rate and the maximum change in p-AVP (r = 0.57, P [is less than] 0.03). During the infusion study, u-AQP2 rate was at maximum 90 min after the infusion [baseline: 4.5 ng/min (3.5-4.8); 90 min: 5 ng/min (4.5-6.0) P [is less than] 0.02]. p-AVP increased from 1.0 (0.9-1.1) to 1.5 (1.2-1.8; P [is less than] 0.002) pmol/]. There was a positive correlation between the maximum change in u-AQP2 rate and the maximum change in p-AVP (r = 0.83; P [is less than] 0.0001). It can be concluded that p-AVP and u-AQP2 are increased during thirst and hypertonic saline infusion and that u-AQP2 reflects the action of AVP on the collecting ducts. arginine vasopressin; healthy subjects; urinary output; aquaporin-2

Published
2001

44. Structure and crystallinity of water dispersible photoactive nanoparticles for organic solar cells

Author

Pedersen, E. B. L., Pedersen, M. C., Simonsen, S.B., Brandt, Rasmus Guldbæk, Bottiger, A. P. L., Andersen, T. R., Jiang, W., Xie, Z. Y., Krebs, F. C., Arleth, L., Andreasen, J. W., Pedersen, E. B. L., Pedersen, M. C., Simonsen, S.B., Brandt, Rasmus Guldbæk, Bottiger, A. P. L., Andersen, T. R., Jiang, W., Xie, Z. Y., Krebs, F. C., Arleth, L., and Andreasen, J. W.

Published
2015

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