Zobrazeno 1 - 10
of 75
pro vyhledávání: '"Stefan Nikolov"'
Publikováno v:
Pharmacia, Vol 68, Iss 4, Pp 755-762 (2021)
The focus of the presented study is the in vitro anti-oxidant activity and anti-diabetic potential of water extracts from the following four herbal substances, not traditionally used for treatment of diabetes mellitus – leaves of Sambucus ebulus L.
Externí odkaz:
https://doaj.org/article/365f87e4ae494fcab51df255059bdc2e
Autor:
Ilina Krasteva, Stefan Nikolov
Publikováno v:
Química Nova, Vol 31, Iss 1, Pp 59-60 (2008)
Nine flavonoids were identified in aerial parts of Astragalus corniculatus Bieb. (Fabaceae) by liquid chromatography coupled with ionspray mass spectrometry in the tandem mode (LC/MS/MS) with negative ion detection. Vitexin, orientin and eriodictyol-
Externí odkaz:
https://doaj.org/article/19f26bf1b7c749fa897d511f98adefc0
Autor:
Dragia Ivanov, Stefan Nikolov
Publikováno v:
Natural Science and Advanced Technology Education. 31:231-254
This paper considers the floating of solid homogenous bodies with different simple shapes. The stable floating positions attained by the bodies are examined and some qualitative rules are derived to determine those positions. The sensitivity of those
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0f67a3692fd9a162b81d96caa8042f8c
https://doi.org/10.53656/nat2022-3.06
https://doi.org/10.53656/nat2022-3.06
Publikováno v:
Pharmacia, Vol 68, Iss 4, Pp 755-762 (2021)
Pharmacia 68(4): 755-762
Pharmacia 68(4): 755-762
The focus of the presented study is the in vitro anti-oxidant activity and anti-diabetic potential of water extracts from the following four herbal substances, not traditionally used for treatment of diabetes mellitus – leaves of Sambucus ebulus L.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eb4f475b6870a3daca34009c2a660721
https://pharmacia.pensoft.net/article/72769/
https://pharmacia.pensoft.net/article/72769/
Autor:
R Simenova, V Tsankova, Magdalena Kondeva-Burdina, Paraskev Nedialkov, Stefan Nikolov, Zlatina Kokanova-Nedialkova
Publikováno v:
Planta Medica. 81:S1-S381
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::61351f0677bd3ed303870e5449413d4f
https://doi.org/10.1055/s-0036-1596856
https://doi.org/10.1055/s-0036-1596856
Autor:
Stefan Nikolov, Dragia Ivanov
Publikováno v:
The Physics Teacher. 54:460-463
The rainbow is a beautiful optical phenomenon that has fascinated humankind since antiquity. It is caused by a huge number of water droplets in the atmosphere illuminated by the Sun. Many noted physicists have contributed to the explanation of the ra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::447c39fbf3a9b9d75d85f2eaee92d14c
https://doi.org/10.1119/1.4965263
https://doi.org/10.1119/1.4965263
Autor:
Dragia Ivanov, Stefan Nikolov
Publikováno v:
Physics Education. 55:055008
The anomalous thermal expansion of water in the 0 °C–4 °C range is extremely important to life on Earth, but it is normally not presented experimentally in educational settings. This paper presents a simple experiment to explore the anomalous the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7847fb631e027337cc05723b350b0912
https://doi.org/10.1088/1361-6552/ab9480
https://doi.org/10.1088/1361-6552/ab9480
Autor:
Dragia Ivanov, Stefan Nikolov
Publikováno v:
Physics Education. 55:025006
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e3473def5a11d3c19293a9d56314d451
https://doi.org/10.1088/1361-6552/ab5ce4
https://doi.org/10.1088/1361-6552/ab5ce4
Autor:
Dragia Ivanov, Stefan Nikolov
Publikováno v:
Physics Education. 50:548-559
In this paper we consider the main properties of cylindrical lenses and propose several demonstrational experiments that can be performed with them. Specifically we use simple glasses full of water to demonstrate some basic geometrical optics princip
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c0e035b57471ca1e3d98db0e6e444646
https://doi.org/10.1088/0031-9120/50/5/548
https://doi.org/10.1088/0031-9120/50/5/548
Publikováno v:
Physics Education. 49:436-442
In this paper we present three different methods for testing Bernoulli’s law that are different from the standard ‘tube with varying cross-section’. They are all applicable to high-school level physics education, with varying levels of theoreti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::73231264b6e22c49c99da20879d6baeb
https://doi.org/10.1088/0031-9120/49/4/436
https://doi.org/10.1088/0031-9120/49/4/436