Иван Ангелов

Supply Chain Resilience as a Strategic Capability in Film Production: A Risk Management Perspective

Иван Ангелов, Brenda Letissia MEKAMBOU KUPOU

Abstract The research explores how supply chain resilience functions as an essential strategic capability within the film production industry, which mainly operates through project-based work methods that very often experience unpredictable conditions and require specialized assets and deliver results within restricted timeframes. …

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Title Market Expansion of Protein-Based Dairy Products in Middle Eastern Countries: Opportunities, Challenges, and Competitive Strategies

Иван Ангелов, Karim ALAEDDINE

Abstract The global dairy industry has been changing dramatically since health, functionality, and performance-oriented nutrition have become the primary consumers’ choices. One of these trends is that of protein-fortified dairy items, especially high-protein yoghurt, labneh and fermented milk beverages. The present paper …

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Tautomerism and switching in 7-hydroxy-8-(azophenyl)quinoline and similar compounds

Lidia Zaharieva, Vera Deneva, Fadhil S. Kamounah, Nikolay Vassilev et autres

Tautomerism in two new azo dyes, based on 7-hydroxyquinoline, has been considered from the viewpoint of the proton crane concept. Although 8-(phenyldiazenyl)quinolin-7-ol exists in solution as a mixture of azo and two hydrazone tautomers, as shown by the experimental and theoretical results, …

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Key Leadership Functions for Achieving Long-Term Competitive Advantage in Business

Иван Ангелов

Abstract Effective management of human and social capital in the context of strategic leadership occupies an important place in the development of modern organizations. This article presents a model that includes six key functions of strategic leaders to achieve sustainable competitive advantage. …

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Spectral properties of collagen types and their application for diagnostics

Tsanislava Genova, Al. Zhelyazkova, Lidia Zaharieva, Иван Ангелов

Abstract Collagen is one of the main structural proteins in the extracellular matrix. However, its role is not only as a building element in different types of tissues, but also as a signaling molecule, which takes part in regulating processes defining the …

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A serine protease photodynamic inhibition by phthalocyanines: effect of light spectra

Diana Braikova, Иван Ангелов, Vanya Mantareva

Abstract The photosensitive compounds have been settled as capable to be involved in a wide collection of photo-physicochemical developments for biomedical and ecological applications. This is based on their ability of light absorption in the ultraviolet-visible or near IR spectra with formation …

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Excitation-emission matrices fluorescence spectroscopy for analysis of Bulgarian traditional wine varieties

Lidia Zaharieva, Tsanislava Genova, Иван Ангелов, Al. Zhelyazkova et autres

Abstract Bulgaria is home to unique grape varieties, such as Mavrud, Broadleaved Melnik, Gamza, Red Misket, and Dimyat, which have been cultivated for thousands of years. Despite this rich history, traditional Bulgarian wines have not been the subject of extensive research. There …

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Dithienylethene Proton Cranes – Another Way to Switch the Tautomeric State

Lidia Zaharieva, Vera Deneva, Иван Ангелов, Liudmil Antonov

Dithienylethenes (DTE) are a rare class of photoswitches, which are capable of undergoing a fast photochemical cyclization leading to increased aromaticity of the closed isomer. At the same time in most of the tautomeric compounds the tautomeric state is strongly affected by …

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Ultrashort laser-induced nuclear reactions: initiating decay of helium nuclei and subsequent fusion reactions

L. M. Kovachev, Ekaterina Iordanova, Georgi Yankov, Иван Ангелов

We present a novel method to construct particle accelerators targeting light atoms and nuclei using high-power femtosecond laser pulses. Initially, we confine light atoms within the laser pulse envelope due to longitudinal polarization forces, allowing them to acquire kinetic energies of several …

Accomplishment of α-Chymotrypsin on Photodynamic Effect of Octa-Substituted Zn(II)- and Ga(III)-Phthalocyanines against Melanoma Cells

Vanya Mantareva, Diana Braikova, Neli Vilhelmova-Ilieva, Иван Ангелов et autres

Octa-methylpyridiloxy-substituted Zn(II)- and Ga(III)-phthalocyanines (ZnPc1 and GaPc1) were studied on human pigmented melanoma (SH4) and keratinocyte (HaCaT) cell lines. The efficacy of ZnPc1 and GaPc1 against melanoma cells was compared to the results in the presence of a proteaseα-chymotrypsin (ChT). The synthesis …

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Stationary External Electric Field—Mimicking the Solvent Effect on the Ground-State Tautomerism and Excited-State Proton Transfer in 8-(Benzo[d]thiazol-2-yl)quinolin-7-ol

Lidia Zaharieva, Иван Ангелов, Liudmil Antonov

The effect of the external electric field on the ground-state tautomerism in 8-(benzo[d]thiazol-2-yl)quinolin-7-ol has been studied by using density functional theory. The compound exists as an enol tautomer (off state) and under the influence of the external electric field a long-range intramolecular …

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PDT and PD of Human Glioblastoma with 5-ALA/PpIX and n-GalLuPc

Lidia Zaharieva, Иван Ангелов, Tsanislava Genova, Dobroslav Kyurkchiev et autres

Abstract Glioblastoma (GBM) is the most common and severe type of brain tumor. Surgery and subsequent radiotherapy and chemotherapy do not lead to sufficient results in the treatment of this type of malignancy, mostly due to its specific morphology. Only about 6% …

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