Role of the C(6)-Hydroxy Group in Bicyclomycin:  Synthesis, Structure, and Chemical, Biochemical, and Biological Properties

1998 ◽  
Vol 41 (7) ◽  
pp. 1185-1194 ◽  
Author(s):  
Alejandro Santillán, ◽  
Xiangdong Zhang ◽  
Jon Hardesty ◽  
William R. Widger ◽  
Kohn
Keyword(s):  
Hydroxy Group ◽  
Biological Properties

Green synthesis of silver nanoparticles using sustainable resources and their use as antibacterial agents: A review

2020 ◽  
Vol 13 ◽  
Author(s):  
Kumari Jyoti ◽  
Punyasloka Pattnaik ◽  
Tej Singh
Keyword(s):  
Silver Nanoparticles ◽  
Plant Extracts ◽  
Metallic Nanoparticles ◽  
Cost Effective ◽  
Biological Properties ◽  
Metal Species ◽  
Sustainable Resources ◽  
Research Areas ◽  
Low Toxicity

Background:: Synthesis of metallic nanoparticles has attracted extensive vitality in numerous research areas such as drug delivery, biomedicine, catalysis etc. where continuous efforts are being made by scientists and engineers to investigate new dimensions for both technological and industrial advancements. Amongst numerous metallic nanoparticles, silver nanoparticle (AgNPs) is a novel metal species with low toxicity, higher stability and significant chemical, physical and biological properties. Methods:: In this, various methods for the fabrication of AgNPs are summarized. Importantly, we concentrated on the role of reducing agents of different plants parts, various working conditions such as AgNO3 concentration; ratio of AgNO3/extract; incubation time; centrifugal conditions, size and shapes. Results:: This study suggested that eco-friendly and non toxic biomolecules present in the extracts (e.g. leaf, stem and root) of plants are used as reducing and capping agents for silver nanoparticles fabrication. This method of fabrication of silver nanoparticles using plants extracts is comparatively cost-effective and simple. A silver salt is simply reduced by biomolecules present in the extracts of these plants. In this review, we have emphasized the synthesis and antibacterial potential of silver nanoparticles using various plant extracts. Conclusion:: Fabrication of silver nanoparticles using plant extracts have advantage over the other physical methods, as it is safe, eco-friendly and simple to use. Plants have huge potential for the fabrication of silver nanoparticles of wide potential of applications with desired shape and size.

Physical and Biological Properties and Principles

2018 ◽  
Keyword(s):  
Biological Properties ◽  
Animal Locomotion ◽  
The Media ◽  
Key Dimensions ◽  
Scaling Analyses ◽  
Physical Principles

Studies of animal locomotion are grounded in an understanding of the physical principles that govern how animals move and properties of the media through which they move. These studies, in turn, explain why certain biological devices, such as a wing or a fin, share features that have evolved for movement within their particular fluid environments. In this chapter, we examine the role of the environment and the fundamentals of loading and forces in animal mechanics. We offer a quick review of scaling analyses as well as the key dimensions and units used in this book to assist with your appreciation of the information.

scholarly journals Tocopherols and Tocotrienols—Bioactive Dietary Compounds; What Is Certain, What Is Doubt?

2021 ◽  
Vol 22 (12) ◽  
pp. 6222
Author(s):  
Kacper Szewczyk ◽  
Aleksandra Chojnacka ◽  
Magdalena Górnicka
Keyword(s):  
Vitamin E ◽  
Metabolic Disorders ◽  
Tissue Concentration ◽  
Biological Properties ◽  
Biological Role ◽  
Future Research ◽  
The Past ◽  
The Subject ◽  
The Relationship

Tocopherols and tocotrienols are natural compounds of plant origin, available in the nature. They are supplied in various amounts in a diet, mainly from vegetable oils, some oilseeds, and nuts. The main forms in the diet are α- and γ-tocopherol, due to the highest content in food products. Nevertheless, α-tocopherol is the main form of vitamin E with the highest tissue concentration. The α- forms of both tocopherols and tocotrienols are considered as the most metabolically active. Currently, research results indicate also a greater antioxidant potential of tocotrienols than tocopherols. Moreover, the biological role of vitamin E metabolites have received increasing interest. The aim of this review is to update the knowledge of tocopherol and tocotrienol bioactivity, with a particular focus on their bioavailability, distribution, and metabolism determinants in humans. Almost one hundred years after the start of research on α-tocopherol, its biological properties are still under investigation. For several decades, researchers’ interest in the biological importance of other forms of vitamin E has also been growing. Some of the functions, for instance the antioxidant functions of α- and γ-tocopherols, have been confirmed in humans, while others, such as the relationship with metabolic disorders, are still under investigation. Some studies, which analyzed the biological role and mechanisms of tocopherols and tocotrienols over the past few years described new and even unexpected cellular and molecular properties that will be the subject of future research.

The Molecular Diversity Scope of Oxindole derivatives in Organic Synthesis.

2021 ◽  
Vol 25 ◽  
Author(s):  
Ghodsi Mohammadi Ziarani ◽  
Fatemeh Javadi ◽  
Fatemeh Mohajer
Keyword(s):  
Organic Chemistry ◽  
Organic Synthesis ◽  
Molecular Diversity ◽  
Biological Properties ◽  
Organic Reactions ◽  
Microbial Properties ◽  
Anti Cancer

: The role of oxindole derivatives is discussed as starting materials in diverse organic reactions including two and more components between the years 2014 until 2020. Oxindoles are famous because of their biological properties for instance chromanone-fused polycyclic pyrrolidinyl-dispirooxindoles, functionalized polycyclic spiro-fused carbocyclicoxindole, and 3,3-disubstituted oxindoles have anti-cancer, anti-tumor, and anti-microbial properties, respectively. Therefore, various methods for synthesizing the oxindole structures have received more attention in organic chemistry.

ASYMMETRIC OXIDATION OF β-HYDROXYSULFIDES. THE ROLE OF THE HYDROXY GROUP

1988 ◽  
Vol 37 (3-4) ◽  
pp. 171-174 ◽  
Author(s):  
O. Bortolini ◽  
F. Di Furia ◽  
G. Licini ◽  
G. Modena
Keyword(s):  
Hydroxy Group ◽  
Asymmetric Oxidation

scholarly journals A brief history of studying the role of intestinal factor in aging and/or induction of systemic inflammation: Achievements, challenges, and prospects

2019 ◽  
pp. 4-17
Author(s):  
И.А. Аниховская ◽  
В.А. Белоглазов ◽  
А.И. Гордиенко ◽  
Ю.Д. Иванов ◽  
А.В. Кубышкин ◽  
...  
Keyword(s):  
Life Support ◽  
Age Groups ◽  
World Ocean ◽  
Biological Properties ◽  
Surgical Removal ◽  
Russian Scientist ◽  
Blue Green Algae ◽  
General Pathology ◽  
Systemic Endotoxemia

Изучение кишечного фактора в скорости старения, индукции воспаления и прогрессировании заболеваний неразрывно (прямо или косвенно) связано с великим русским учёным И.И. Мечниковым. Его интуиция инициировала изучение особенностей состава микробиоты долгожителей и операций по удалению толстой кишки (как рудимента и источника токсичных продуктов гниения), результаты которых не имели научного и практического успеха и завершились чуть менее 100 лет тому назад, ознаменовав собой завершение первого этапа исследований. Параллельно с первым стартовал второй этап. Он заключался в изучении биологических свойств и структуры эндотоксина - липополисахарида (ЛПС), число молекул которого на планете очень велико, поскольку ЛПС термостабилен, а главным его источником являются сине-зелёные водоросли, заселившие Мировой океан около 2 миллиардов лет тому назад. Третий этап изучения кишечного фактора в общей патологии стартовал в России треть века назад на стыке первых двух параллельно развивающихся направлений с постулирования системной эндотоксинемии, как облигатного биологического явления и открытия клеточного рецептора TLR4, лигандом которого является ЛПС. В дальнейшем TLR4-подобные рецепторы были обнаружены даже у растений, что позволяет квалифицировать ЛПС не только как экзогормон адаптации, но и как облигатный фактор эволюции. Последняя подразумевает самообновление популяции, для реализации которой облигатные факторы жизнеобеспечения должны обладать и противоположным действием, среди которых стресс и ЛПС. Способность средств снижения содержания ЛПС в крови повышать качество лечебно-профилактического процесса позволяет оптимистично оценивать возможность замедления процессов старения. Первоочередными задачами для достижения поставленной цели являются: определение диапазона физиологических показателей системной эндотоксинемии во всех возрастных группах и создание нового поколения доступных для широкого использования средств селективной элиминации избытка ЛПС из крови (гемодиализ) и кишечника (энтеросорбция), которые могут быть созданы на основе аптамеров. Studying the role of intestinal factor in the rate of aging, induction of inflammation, and progression of diseases is inextricably (directly or indirectly) associated with the great Russian scientist I.I. Mechnikov. His intuition initiated studying the long-livers’ microbiota and the surgical removal of the colon (as a rudiment and source of toxic rotting products), which did not bring any scientific or practical success. These studies were over a little less than 100 years ago marking the end of the first stage of research. The second stage started in parallel with the first one and consisted in studying biological properties and structure of endotoxin (lipopolysaccharide, LPS). LPS molecules are as numerous on the earth as in the air since LPS is thermally stable and generated by blue-green algae that have inhabited the World Ocean two billion years ago. The third stage of studying the intestinal factor in general pathology started in Russia one third of a century ago at the junction of the two above-mentioned, paralleling endeavors - postulating systemic endotoxemia as an obligate biological phenomenon and discovery of the LPS receptor (TLR4) of innate immunity. TLR4 is carried by humans, animals, fish, sponges, and even plants, which suggests that LPS is not only an adaptive exohormone but also an obligate factor of evolution. This implies population self-renewal, which requires that the obligate life-support factors must also possess an opposite effect, including stress and intestinal LPS. The ability of LPS suppressors to enhance the therapeutic and prophylactic process makes promising a possibility of slowing aging. The primary tasks for achieving this goal are determining the range of systemic endotoxemia physiological indexes in all age groups and creating a readily accessible new generation of methods for selective elimination of LPS from blood (hemodialysis) and intestine (enterosorption) that could be developed on the basis of aptamers.

scholarly journals ROLE OF NANOTECHNOLOGY IN DENTAL SCIENCES: A REVIEW

2020 ◽  
Vol 4 (3) ◽  
Author(s):  
Ramakoteswara Rao N ◽  
Kranthi kiran Reddy E ◽  
Leena Gahane ◽  
SV Ranganayakulu
Keyword(s):  
Materials Science ◽  
Biological Properties ◽  
Synthesis Methods ◽  
Nano Technology ◽  
New Science ◽  
Physical Chemical ◽  
Health Related ◽  
Nano Science ◽  
Physical And Chemical

Nano technology is the multi disciplinary science and technology, which has emerged as new science exploiting specific phenomena and direct manipulation of materials on nanoscale. Nanotechnology deals with the physical, chemical, and biological properties of structures and their parts at nanoscale dimensions. It's established on the concept by creating functional structures by controlling corpuscles and molecules on a one-by-one basis by different physical and chemical synthesis methods. Developments in materials science and, nano biotechnology is especially forestalled to provide elevates in dental sciences and initiations in oral health-related diagnostic and therapeutical methods. Keywords: Nano Science, dentistry, Nanocomposite, Nanorobots, Nanomaterials.

scholarly journals Polyphenols: From Theory to Practice

Foods ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2595
Author(s):  
Alberto Bertelli ◽  
Marco Biagi ◽  
Maddalena Corsini ◽  
Giulia Baini ◽  
Giorgio Cappellucci ◽  
...  
Keyword(s):  
Matrix Effect ◽  
Virgin Olive Oil ◽  
Extra Virgin Olive Oil ◽  
Biological Properties ◽  
Health Claims ◽  
In Vitro Tests ◽  
The Matrix ◽  
Gender Characteristics

Background: The importance of polyphenols in human health is well known; these compounds are common in foods, such as fruits, vegetables, spices, extra virgin olive oil and wine. On the other hand, the different factors that modulate the biological activity of these compounds are less well known. Conceptualization of the work: In this review we took into account about 200 relevant and recent papers on the following topics: “polyphenols bioavailability”, “polyphenols matrix effect”, “food matrix effect”, “polyphenols-cytochromes interaction”, after having reviewed and updated information on chemical classification and main biological properties of polyphenols, such as the antioxidant, anti-radical and anti-inflammatory activity, together with the tricky link between in vitro tests and clinical trials. Key findings: the issue of polyphenols bioavailability and matrix effect should be better taken into account when health claims are referred to polyphenols, thus considering the matrix effect, enzymatic interactions, reactions with other foods or genetic or gender characteristics that could interfere. We also discovered that in vitro studies often underrate the role of phytocomplexes and thus we provided practical hints to describe a clearer way to approach an investigation on polyphenols for a more resounding transfer to their use in medicine.

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