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  • Author or Editor: I. Szendrő x
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The total body composition of 4×10 female, 5-month-old New Zealand White rabbits was determined, using direct chemical analysis and computerised tomography (CT). Ten non-pregnant rabbits (control) and 3 × 10 pregnant rabbits at days 14, 21 and 28 of gestation, respectively, were included in the study. With the advancement of pregnancy, the body weight (BW) of does significantly (P < 0.05) increased (control: 3255 g, day 28: 3938 g), while the dry matter, DM (control: 43.02%, day 28: 40.94%), ether extract, EE (control: 20.15%, day 28: 18.13%), crude protein, CP (control: 20.15%, day 28: 18.13%), and energy concentration decreased (control: 12.41 MJ/kg BW, day 28: 11.81 MJ/kg BW). During pregnancy the protein content of uteri (control: 12.24%, day 28: 49.45% of DM) and the retained energy in the form of uterus with fetuses (day 14: 0.824 MJ, day 28: 2.189 MJ) increased, while the dry matter (control: 82.39%, day 28: 28.96%) and ether extract content (control: 86.05%, day 28: 45.92% of DM) of uteri decreased. With the advancement of pregnancy the dry matter (day 14: 39.70%, day 28: 18.65%) and crude protein (day 14: 75.74%; day 28: 63.63% of DM) content and the number of fetuses (day 14: 8.8; day 28: 6.4) decreased, while their fat concentration (day 14: 10.13%, day 28: 24.34% of DM) increased. According to the equations created from the CT pictures, body fat (R2 = 0.871) and energy (R2 = 0.926) content can be predicted with high accuracy. The accuracy of predicting body protein content is much lower (R2 = 0.356), which can be improved by introducing the body weight as a new dependent variable (R2 = 0.797). It can also be concluded that, in contrast to other animal species, rabbit fetuses show considerable development not only in the last trimester of gestation but already from the second half of pregnancy.

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Nanopages
Authors:
I. Szendrő
,
K. Erdélyi
,
Zs. Puskás
,
M. Fábián
,
N. Adányi
, and
K. Somogyi

Due to the changes of the refractive indices, the planar optical waveguides are sensitive to the surrounding media, to the adsorbates, etc. on their surface. The sensitivity of such a waveguide layer can be enhanced when its thickness is lowered down to the nanometer range. Such sensors can be successfully operated both in inorganic chemistry and in life sciences as label free biosensors. Principles and some results are demonstrated. Further on, application of transparent conductive oxides for voltammetric measurements in combination with the classical waveguide sensor will be demonstrated. Development and results of a combined system is described and first results with simultaneous measurements are demonstrated. An indium tin oxide nanolayer is deposited and activated on the top of the sensor chip. This electrically conductive oxide layer serves as working electrode in the specially developed electrochemical cuvette. In this work results are presented for simultaneous use of these two methods and for simultaneous measurement of refractive index changes of the waveguiding system and that of electrical current changes. The first basic results are demonstrated using H2O2 and dye solutions, using KCl and TRIS as buffer and transport media.

Open access