Search results for "vaccini"
showing 10 items of 84 documents
Melleņu (Vaccinium myrtillus L.) un purva dzērveņu (Vaccinium oxycoccus L.) lipīdu sastāva analīze izmantojot gāzes-šķidruma hromatogrāfiju/masas spe…
2019
Melleņu (Vaccinium myrtillus L.) un purva dzērveņu (Vaccinium oxycoccus L.) lipīdu sastāva analīze, izmantojot gāzes − šķidruma hromatogrāfiju ar masspektrometrisko detekciju. Mežulis M., zinātniskā darba vadītājs MSc. Kļaviņš L., Dr. ķīm., prof. Vīksna A., Bakalaura darbs, 49 lappuses, 17 attēli, 15 tabulas, 68 literatūras avoti, 10 pielikumi. Latviešu valodā. Literatūras apskatā aplūkota informācija par mellenēm (Vaccinium myrtillus L.) un purva dzērvenēm (Vaccinium oxycoccus L.), to sastāvu un izmantošanu. Darba eksperimentālajā daļā tika veikta ogās esošo savienojumu ekstrakcija ar hloroformu un heksāna/etilacetāta maisījumu (1:1), ekstraktu frakcionēšana, izmantojot sorbcijas hromatogr…
Lipīdu un polifenolu sastāva salīdzinājums krūmmelleņu (Vaccinium corymbosum) kultivāros un citās Vaccinium ģints ogās
2018
Lipīdu un polifenolu sastāva salīdzinājums krūmmelleņu (Vaccinium corymbosum) kultivāros un citās Vaccinium ģints ogās. Meijere E. K., zinātniskā vadītāja docente, Dr. ķīm. Ilva Nakurte, Bakalaura darbs, 53 lappuses, 20 attēli, 17 tabulas, 38 literatūras avoti, 2 pielikumi. Latviešu valodā. Literatūras apskatā apkopota informācija par krūmmelleņu (Vaccinium corymbosum L.) kultivāriem ‘Polaris’, ‘Patriot’,’ Chippewa’, ‘Blue crop’, ‘Blue ray’, ‘Blue gold’, ‘North blue’, ‘Duke’ un citām Vaccinium ģints ogām - zilene (Vaccinium uliginosum L.), brūklene (Vaccinium vitis-ideaea L.), mellene (Vaccinium myrtillus L.), purva dzērvene (Vaccinium oxycoccos L.), lielogu dzērvene (Vaccinium macrocarpon …
Chitosomes loaded with cranberry proanthocyanidins attenuate the bacterial lipopolysaccharide-induced expression of iNOS and COX-2 in raw 264.7 macro…
2009
Chitosan binds to negatively charged soy lecithin liposomes by an electrostatic interaction driven by its positively charged amino group. This interaction allows stable covered vesicles (chitosomes) to be developed as a suitable targeted carrier and controlled release system. This study investigated the effect of chitosomes on the activation of cranberry proanthocyanidins (PAC) in Raw 264.7 macrophages. Chitosomes were characterized according to size, zeta potential, PAC-loading, and release properties. Results showed an increase in the net positive charge and size of the liposomes as the concentration of chitosan was increased, suggesting an effective covering of the vesicles by means of e…
Variations of some Metallic Elements in Different Parts of Lingonberries <i>(Vaccinium vitis-idaea L.)</i>
2021
The aim of the research was to evaluate the content of metallic elements in different parts of lingonberries (Vaccinium vitis-idaea L.) depending on their place of growth and evaluate the transfer factor values from between different parts of plants (fine roots, leaves, berries). Obtained results show that there are no significant differences between the content of Fe, Cu, Zn and K, and there are similar element transfer factors between different parts of lingonberries independent from which site the samples are taken.
Enhanced adaptation of vesicular stomatitis virus in cells infected with vaccinia virus.
2008
Infections involving different viruses (multiple infections) are common in nature and can take place between different strains of the same virus or between different virus species, including DNA and RNA viruses. The influence of multiple infections on viral evolution has been previously studied using different populations of the same virus. Here, we took a step forward by studying the evolution of an RNA virus (vesicular stomatitis virus, VSV) in the presence of a resident DNA virus (vaccinia virus, VV). Cell cultures were infected with a constant amount of VV, and VSV was added at four different post-VV-inoculation times and four different population sizes. The results showed that the pres…
Compositional and morphological analyses of wax in northern wild berry species.
2019
Accepted manuscript version, licensed CC BY-NC-ND 4.0. Aerial surfaces of plants are covered by a waxy cuticle protecting plants from excessive water loss and UV light. In the present study, composition and morphology of cuticular waxes of northern wild berry species bilberry (Vaccinium myrtillus L.), lingonberry (V. vitis-idaea L.), bog bilberry (V. uliginosum L.) and crowberry (Empetrum nigrum L.) were investigated. Scanning electron microscopy (SEM) revealed differences in epicuticular wax morphology, and gas chromatography–mass spectrometry (GC–MS) analysis confirmed variation in chemical composition of cuticular waxes between the berry species. The dominant compounds in bilberry and li…
Complex formation between the NS3 serine-type proteinase of the hepatitis C virus and NS4A and its importance for polyprotein maturation
1995
Processing of the hepatitis C virus polyprotein is mediated by host cell signalases and at least two virally encoded proteinases. Of these, the serine-type proteinase encompassing the amino-terminal one-third of NS3 is responsible for cleavage at the four sites carboxy terminal of NS3. The activity of this proteinase is modulated by NS4A, a 54-amino-acid polyprotein cleavage product essential for processing at the NS3/4A, NS4A/4B, and NS4B/5A sites and enhancing cleavage efficiency between NS5A and NS5B. Using the vaccinia virus-T7 hybrid system to express hepatitis C virus polypeptides in BHK-21 cells, we studied the role of NS4A in proteinase activation. We found that the NS3 proteinase a…
Immunological analyses of human papillomavirus capsids
2001
Recombinant human papillomavirus (HPV) virus-like particles (VLPs) are promising vaccine candidates for controlling anogenital HPV disease. Questions remain, however, concerning the extent of capsid antigenic similarity between closely related virus genotypes. To investigate this issue, we produced VLPs and corresponding polyclonal immune sera from several anogenital HPV types, and examined these reagents in enzyme-linked immunosorbent assays (ELISAs) and in cross-neutralization studies. Despite varying degrees of L1 genetic sequence relatedness, VLPs of each type examined induced high-titer serum polyclonal antibody responses that were entirely genotype-specific. In an in vitro infectivity…
Irradiation detection of herbal ingredients used in plant food supplements by Electron Spin Resonance on samples pre-treated with alcoholic extraction
2020
Abstract This study aimed to verify the applicability of the EN 1787 method for the detection of irradiation in herbal ingredients used in Plant Food Supplements (PFSs). In matrices such as herbs and spices the main limit of the method is the presence of intrinsic radicals responsible for spurious signals leading to complex ESR spectra. To overcome this limit, before ESR measurement a treatment with alcohol has been proposed (Delincee and Soika, 2002; Ahn et al., 2012, 2014). As reported in the literature, this treatment is expected to reduce/eliminate the confounding signals so that the samples may be correctly classified. In this study the efficacy of the pre-treatment was tested on raw h…
Botāniskā dārza sekciju "Augu daudzveidības pētījumi ex situ" un "Augu selekcija un introdukcija" tēžu krājums (2020. gada 30. janvāris, LU Botāniska…
2020
Latvijas Universitātes 78. starptautiskā zinātniskā konference LU Botāniskajā dārzā notiek 2020. gada 30. janvārī. Krājumā ir 13 ziņojumu kopsavilkumi: pieci kopsavilkumi LU prioritārās tēmas "Ekoloģija un bioloģiskā daudzveidība" apakštēmas/sekcijas "Augu daudzveidības pētījumi ex situ" un astoņi kopsavilkumi sekcijas "Augu selekcija un introdukcija" ziņojumiem.