scholarly journals Modifying chitosan with n-butyl acrylate - antibacterial ability

2019 ◽  
Vol 2 (2) ◽  
pp. 12-18
Author(s):  
Ha Thi Thai La ◽  
Mai Ngoc Chau
Keyword(s):  
Acetic Acid ◽  
Glass Transition ◽  
Butyl Acrylate ◽  
Antibacterial Agent ◽  
Natural Polymers ◽  
Tert Butyl Hydroperoxide ◽  
Wide Range ◽  
The World ◽  
Grafting Copolymerization ◽  
Lower Glass Transition Temperature

Polymer deriving from nature as Chitosan, which is one of the most abundant natural polymers in the world has effectively antibacterial potentiality. However, chitosan is relatively difficult for applications due to its disadvantageous properties. In this article, modifying chitosan (CS) is the grafting copolymerization using monomer n-butyl acrylate (BA) and tert-butyl hydroperoxide (TBHP) as an initiator. This process purposes to attain product having lower glass transition temperature (Tg) than original chitosan causing a wide range of applications but still keeping the capability of being an excellently antibacterial agent. The effects of parameters on synthesizing copolymer were studied by determining the grafting percentage (G%) and grafting efficiency (E%). The results revealed that the highest G = 242% and E = 61% were obtained at the conditions as following: BA/CS = 4 w/w, TBHP/CS = 5 v/w with [TBHP] = 20mM, [CS] = 0.75% w/v in acetic acid 0.6% and reaction temperature 90°C in 6 hours.

scholarly journals Fermentation of Cocoa Beans

2021 ◽  
Author(s):  
Romel E. Guzmán-Alvarez ◽  
José G. Márquez-Ramos
Keyword(s):  
Acetic Acid ◽  
Scientific Information ◽  
Acetic Acid Bacteria ◽  
Cocoa Bean ◽  
Microbial Succession ◽  
Cocoa Bean Fermentation ◽  
Wide Range ◽  
The World ◽  
Flavor Precursors ◽  
Cocoa Fermentation

Cocoa bean fermentation is a spontaneous process driven by an ordered microbial succession of a wide range of yeasts, lactic acid and acetic acid bacteria, some aerobic sporeforming bacteria and various species of filamentous fungi. The process of cocoa fermentation is a very important step for developing chocolate flavor precursors which are attributable to the metabolism of succession microbial. The microbial ecology of cocoa has been studied in much of the world. In Venezuela, studies have been carried out with Criollo, Forastero, and Trinitario cocoa, fermented under various conditions, the results obtained coinciding with the reported scientific information. Fermentation must be associated with the type of cocoa available, carried out knowing the final processing and derivative (paste, butter, powder). The results shown in this chapter correspond to investigations carried out with cocoa from three locations in Venezuela. The quantification, identification, isolation, functionality of the most representative microbiota involved in the fermentation of these grains was sought. This to give possible answers to the fermentation times and improvement of the commercial quality. Likewise, generate greater interest on the part of the producers in carrying out the fermentation.

scholarly journals SYNTHESIS AND ANTIBACTERIAL ACTIVITY OF COMPOSITE BASED ON CHITOSAN-GRAFTED-(N-BUTYL ACRYLATE) AND SILVER NANOPARTICLES

2019 ◽  
Vol 57 (3) ◽  
pp. 309
Author(s):  
La Thi Thai Ha ◽  
Chau Ngoc Mai
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Butyl Acrylate ◽  
Chemical Reduction ◽  
Antibacterial Activities ◽  
Butyl Hydroperoxide ◽  
Grafting Efficiency ◽  
Tert Butyl Hydroperoxide ◽  
Long Time ◽  
Grafting Copolymerization

It has been found for a long time that chitosan (CS) and silver nanoparticles (AgNPs) have outstanding antibacterial activities but there were some drawbacks restricting their wide utilization. In this research, CS modified is combined with AgNPs to expand applications and enhance the antibacterial activities. The colloid of CS and AgNPs (CS/Ag) was synthesized via chemical reduction while grafting copolymerization was carried out with monomer n-butyl acrylate (BA) and initiator tert-butyl hydroperoxide (TBHP) generating composite between CS-g-BA/Ag. The effects of parameters on synthesizing CS-g-BA/Ag composite were studied by determining the grafting percentage (G%) and grafting efficiency (E%).

Creative Strategy Used in Electronic Advertising

GIS Business ◽  
2019 ◽  
Vol 14 (6) ◽  
pp. 597-606
Author(s):  
Dr. Maha Mustafa Omer Abdalaziz
Keyword(s):  
The Internet ◽  
Business Organizations ◽  
Creative Strategy ◽  
Electronic Environment ◽  
Wide Range ◽  
The World ◽  
Technological Developments ◽  
Electronic Advertising

The study aims at the technological developments that are taking place in the world and have impacted on all sectors and fields and imposed on the business organizations and commercial companies to carry out their marketing and promotional activities within the electronic environment. The most prominent of these developments is the emergence of the concept of electronic advertising which opened a wide range of companies and businessmen to advertise And to promote their products and their work easily through the Internet, which has become full of electronic advertising, and in light of that will discuss the creative strategy used in electronic advertising;

ARTISTIC ASSIMILATION OF THE WORLD IN THE ESSAY PROSE OF M. G. ATAMANOV (BASED ON THE BOOK “I AM UDMURT. WHY DOES IT HURT?”)

2020 ◽  
Vol 14 (3) ◽  
pp. 459-464
Author(s):  
Alevtina Vasilevna Kamitova ◽  
Tatyana Ivanovna Zaitseva
Keyword(s):  
Ethnic Identity ◽  
National Identity ◽  
National Culture ◽  
Native Language ◽  
Topographic Features ◽  
Wide Range ◽  
The World ◽  
The Subject ◽  
Individual Style

The paper reflects the specificity of the fundamental ideas of the artistic world of M. G. Atamanov, which includes a wide range of literary facts from the content level of the text of the works to their poetics. A particularly important role in the works of M. G. Atamanov is played by cross-cutting themes and images that reflect the author's individual style and his idea of national-ethnic identity. The subject of the research is the book of essays “Mon - Udmurt. Maly mynym vös’?” (“I am Udmurt. Why does it hurt?”), which most vividly reflected the main spiritual and artistic searches of M. G. Atamanov, associated with his ideas about the Udmurt people. The main motives and plots of the works included in the book under consideration are accumulated around the concept of “Udmurtness”. The comprehension of “Udmurtness” is modeled in his essays through specific leit themes: native language, Udmurt people, national culture, mentality, geographic and topographic features of the Udmurt people’ places of residence, the Orthodox idea. The “Udmurt theme” is recognized and comprehended by the writer through the prism of national identity.

Potential Triazole-based Molecules for the Treatment of Neglected Diseases

2019 ◽  
Vol 26 (23) ◽  
pp. 4403-4434 ◽  
Author(s):  
Susimaire Pedersoli Mantoani ◽  
Peterson de Andrade ◽  
Talita Perez Cantuaria Chierrito ◽  
Andreza Silva Figueredo ◽  
Ivone Carvalho
Keyword(s):  
Effective Treatment ◽  
Chagas Disease ◽  
Medicinal Chemistry ◽  
Biological Activities ◽  
Neglected Diseases ◽  
Triazole Derivatives ◽  
Wide Range ◽  
The World ◽  
Great Relevance ◽  
The Moment

Neglected Diseases (NDs) affect million of people, especially the poorest population around the world. Several efforts to an effective treatment have proved insufficient at the moment. In this context, triazole derivatives have shown great relevance in medicinal chemistry due to a wide range of biological activities. This review aims to describe some of the most relevant and recent research focused on 1,2,3- and 1,2,4-triazolebased molecules targeting four expressive NDs: Chagas disease, Malaria, Tuberculosis and Leishmaniasis.

Healthcare apps on smartphones available in Brazil: a preliminary classification (Preprint)

2020 ◽  
Author(s):  
André De Faria Pereira Neto ◽  
Leticia Barbosa ◽  
Rodolfo Paolucci
Keyword(s):  
Health Promotion ◽  
Disease Prevention ◽  
Digital Health ◽  
Disease Process ◽  
World Health ◽  
Computing Device ◽  
Care Treatment ◽  
Wide Range ◽  
The World ◽  
Health Applications

UNSTRUCTURED Billions of people in the world own a smartphone. It is a low-cost, portable computing device with countless features, among which applications stand out, which are programs or software developed to meet a specific goal. A wide range of applications available ranging from entertainment and personal organization to work and education is available currently. It is a vast and profitable market. Health applications have been a means of intervention for different areas, including chronic diseases, epidemics, and health emergencies. A recently published paper in the journal with the highest impact factor in Digital Health (“Journal of Medical Internet Research”) proposes a classification of health applications. This study performs a critical analysis of this organization and presents other sort criteria. This paper also presents and analyzes the “Meu Info Saúde” (“My Health Info”) app – a pioneering government initiative focused on primary care launched by the Oswaldo Cruz Foundation. The application classification proposal that will be presented builds on the intervention strategies in the health-disease process, namely: “Health Promotion”, “Disease Prevention” and “Care, Treatment and Rehabilitation”, as defined by official documents such as the World Health Organization and the Centers for Disease Control and Prevention. Most applications present in the sample are of private and foreign origin, free to download, but with a display of ads or the sale of products and services. The sampled applications were classified as “Health Promotion”, and some applications have also been categorized as “Disease Prevention” or “Care, Treatment or Rehabilitation” because they have multiple functionalities. The applications identified as “Health Promotion” focused only on individuals’ lifestyle and their increased autonomy and self-care management capacity. From this perspective, the apps analyzed in this paper differ from the “Meu Info-Saúde” application developed at Fiocruz.

Introduction

2018 ◽  
Author(s):  
Michael C. Legaspi
Keyword(s):  
Western Culture ◽  
Profound Influence ◽  
Wide Range ◽  
The World ◽  
Way Of Thinking

This is a book about wisdom. It is an inquiry into the beginnings of a particular way of thinking about life in the world. Seen in terms of wisdom, the world is not a meaningless array of disconnected things but something that is experienced as an ordered reality. This holistic way of understanding life in the world characterized pursuits of wisdom in a two-sided classical and biblical tradition that exercised a profound influence on Western culture. This book examines the development of that tradition in a wide range of texts from Homer to Plato and in the writings of early Jewish and Christian authors.

Introduction

2018 ◽  
Author(s):  
Anna-Maria Hartmann
Keyword(s):  
Sixteenth Century ◽  
Early Modern ◽  
Literary History ◽  
First Generation ◽  
Early Modern England ◽  
Related Material ◽  
Wide Range ◽  
The World ◽  
Early English

Mythographies were books that collected, explained, and interpreted myth-related material. Extremely popular during the Renaissance, these works appealed to a wide range of readers. While the European mythographies of the sixteenth century have been utilized by scholars, the short, early English mythographies, written from 1577 to 1647, have puzzled critics. The first generation of English mythographers did not, as has been suggested, try to compete with their Italian predecessors. Instead, they made mythographies into rhetorical instruments designed to intervene in topical debates outside the world of classical learning. Because English mythographers brought mythology to bear on a variety of contemporary issues, they unfold a lively and historically well-defined picture of the roles myth was made to play in early modern England. Exploring these mythographies can contribute to previous insights into myth in the Renaissance offered by studies of iconography, literary history, allegory, and myth theory.

The Remembered Anthropologist: Engaging with the Insights of M. N. Srinivas

2020 ◽  
Vol 69 (2) ◽  
pp. 224-240
Author(s):  
Nita Mathur
Keyword(s):  
Social Sciences ◽  
Nation Building ◽  
Sociological Research ◽  
Contemporary Society ◽  
Social Anthropology ◽  
General Sense ◽  
Wide Range ◽  
The World ◽  
Village Studies ◽  
Specific Sense

The plethora of M. N. Srinivas’s articles and books covering a wide range of subjects from village studies to nation building, from dominant caste in Rampura village to nature and character of caste in independent India, and from prospects of sociological research in Gujarat to practicing social anthropology in India have largely influenced the understanding of society and culture for well over five decades. Additionally, he meticulously wrote itineraries, memoirs and personal notes that provide a glimpse of his inner being, influences, ideologies, thought all of which have inspired a large number of and social anthropologists and sociologists across the world. It is then only befitting to explore the major concerns in the life and intellectual thought of one whose pioneering contributions have been the milestones in the fields of social anthropology and sociology in a specific sense and of social sciences in India in a general sense. This article centres around/brings to light the academic concerns that Srinivas grappled with the new avenues of thought and insights that developed consequently, and the extent of his rendition their relevance in framing/understanding contemporary society and culture in India.

scholarly journals Bioactive potential of natural biomaterials: identification, retention and assessment of biological properties

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Kieran Joyce ◽  
Georgina Targa Fabra ◽  
Yagmur Bozkurt ◽  
Abhay Pandit
Keyword(s):  
Tissue Engineering ◽  
Therapeutic Potential ◽  
Biological Properties ◽  
Biological Assessment ◽  
Cross Linking ◽  
Natural Polymers ◽  
Drug Delivery Device ◽  
Biomedical Device ◽  
Wide Range ◽  
Bioactive Potential

AbstractBiomaterials have had an increasingly important role in recent decades, in biomedical device design and the development of tissue engineering solutions for cell delivery, drug delivery, device integration, tissue replacement, and more. There is an increasing trend in tissue engineering to use natural substrates, such as macromolecules native to plants and animals to improve the biocompatibility and biodegradability of delivered materials. At the same time, these materials have favourable mechanical properties and often considered to be biologically inert. More importantly, these macromolecules possess innate functions and properties due to their unique chemical composition and structure, which increase their bioactivity and therapeutic potential in a wide range of applications. While much focus has been on integrating these materials into these devices via a spectrum of cross-linking mechanisms, little attention is drawn to residual bioactivity that is often hampered during isolation, purification, and production processes. Herein, we discuss methods of initial material characterisation to determine innate bioactivity, means of material processing including cross-linking, decellularisation, and purification techniques and finally, a biological assessment of retained bioactivity of a final product. This review aims to address considerations for biomaterials design from natural polymers, through the optimisation and preservation of bioactive components that maximise the inherent bioactive potency of the substrate to promote tissue regeneration.

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