scholarly journals An Update Report on the Biosafety and Potential Toxicity of Fullerene-Based Nanomaterials toward Aquatic Animals

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Nemi Malhotra ◽  
Gilbert Audira ◽  
Agnes L. Castillo ◽  
Petrus Siregar ◽  
Johnsy Margotte S. Ruallo ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Aquatic Organisms ◽  
Industrial Applications ◽  
Potential Toxicity ◽  
Cage Structure ◽  
Carbon Cage ◽  
Frequent Use ◽  
Waterborne Exposure ◽  
To Come ◽  
Unique Chemical

Fullerene molecules are composed of carbon in the form of a hollow sphere, tube, or ellipsoid. Since their discovery in 1985, they have gained a lot of attention in many science fields. The unique carbon cage structure of fullerene provides immense scope for derivatization, rendering potential for various industrial applications. Thus, the prospective applications of fullerenes have led to assorted fullerene derivatives. In addition, their unique chemical structure also eases them to be synthesized through various kinds of conjugating techniques, where fullerene can be located either on the backbone or the branch chain. In this review, we have compiled the toxicity and biosafety aspects of fullerene in aquatic organisms since the frequent use of fullerene is likely to come in contact and interact with the aquatic environment and aquatic organisms. According to the current understanding, waterborne exposure to fullerene-based nanomaterials indeed triggers toxicities at cellular, organic, molecular, and neurobehavioral levels.

scholarly journals An Update Report on the Biosafety and Potential Toxicity of Fullerene-Based Nanomaterials toward Aquatic Animals

2020 ◽  
Author(s):  
Nemi Malhotra ◽  
Tzong-Rong Ger ◽  
Agnes L. Castillo ◽  
Gilbert Audira ◽  
Petrus Siregar ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Aquatic Organisms ◽  
Industrial Applications ◽  
Potential Toxicity ◽  
Cage Structure ◽  
Carbon Cage ◽  
Frequent Use ◽  
Waterborne Exposure ◽  
To Come ◽  
Unique Chemical

Fullerene molecules are composed of carbon in forms of a hollow sphere, ellipsoid, or tube. Fullerenes have attracted considerable attention in different fields of science since their discovery in 1985. The unique carbon cage structure of fullerene provides immense scope for derivatization, rendering potential for various industrial applications. The prospective applications of fullerenes thus have led to assorted fullerene derivatives. The unique chemical structure also provides ease for fullerene to be synthesized through various kinds of conjugating techniques, where fullerene can be located either on the backbone or the branch chain. Here in this review, we have compiled the toxicity and biosafety aspects of fullerene in aquatic organisms. The frequent use of fullerene is likely to come in contact and interact with the aquatic environment and aquatic organisms. According to the current understanding, waterborne exposure to fullerene-based nanomaterials indeed triggers toxicities at cellular, organic, molecular as well as neurobehavioral levels.

Zwitterions: Promising Interfacial / Doping Materials for Organic / Perovskite Solar Cells

2021 ◽  
Author(s):  
Qiaoyun Chen ◽  
Xudong Yang ◽  
Yi Zhou ◽  
Bo Song
Keyword(s):  
Solar Cells ◽  
Chemical Structure ◽  
Perovskite Solar Cells ◽  
Unique Chemical

Zwitterions, due to the unique chemical structure and electrical charges, has caught continuous attention in organic / perovskite solar cells (OSCs / PSCs). It is widely used as interfacial materials...

Enhancement of Thermo-Oxidative Stability of Vegetable Oil Based Lubricant via Chemical Modification Techniques

2015 ◽  
Vol 813-814 ◽  
pp. 695-699
Author(s):  
S. Arumugam ◽  
G. Sriram ◽  
A. Hemanth Sai Kumar Chowdary ◽  
Janga Subramanya Sai
Keyword(s):  
Chemical Modification ◽  
Oxidative Stability ◽  
Vegetable Oils ◽  
Rapeseed Oil ◽  
Chemical Structure ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Transesterification Method ◽  
Unique Chemical

The rising demand for environmentally acceptable lubricant has led researchers to look to vegetable oils as an alternative to petroleum based lubricants. Vegetable oils have radically distinctive properties owing to their unique chemical structure which have greater ability to lubricate and have higher biodegradability. In spite of advantages, they are limited to inadequate thermo-oxidative stability and poor low-temperature properties which hinder their utilization. In the present study in order to produce a bio lubricant with good thermo-oxidative stability, rapeseed oil was subjected to two different chemical modification techniques viz., epoxidation method and successive transesterification method. The thermo-oxidative stability of formulated oil was analysed using Thermo Gravimetric Analysis (TGA). TGA analysis divulges that the thermo-oxidative stability of rapeseed oil was greatly improved with the epoxidation method in comparison with the successive transesterification method.

scholarly journals Development of Daphnia magna under exposure to the xenobiotic octylphenol

2014 ◽  
Vol 6 (2) ◽  
pp. 155-158
Author(s):  
Thanh Son Dao ◽  
Thi My Chi Vo ◽  
Hong Lan Chi Do ◽  
Phuoc Dan Nguyen
Keyword(s):  
Developing Country ◽  
Daphnia Magna ◽  
Aquatic Organisms ◽  
Environmental Concerns ◽  
Human Beings ◽  
Ecological Health ◽  
Potential Toxicity ◽  
Chronic Effects ◽  
High Concentrations ◽  
Significant Mortality

Xenobiotics are of human and environmental concerns due to their potential toxicity. Octylphenol is one of the very common and daily used xenobiotics in door and out door activities of human beings. Toxicity of octylphenol to aquatic organisms, especially to zooplankton (e.g. Daphnia magna) was investigated but not fully understood. In this study we evaluated the chronic effects of octylphenol at the concentrations of 5, 50 and 500 µg L-1 on Daphnia magna over a period of 14 days. The results showed that low concentration of octylphenol (5 µg L-1) stimulated the maturation while high concentrations of the chemical (50 and 500 µg L-1) caused a significant mortality to the Daphnia. Besides, all the tested concentrations of octylphenol had serious impacts on fecundity and growth of the animals. Investigations on the presence, distribution, fate and toxicity of xonobiotics including octylphenol in the developing country environment are suggested for human, environmental and ecological health protection. Những hợp chất tổng hợp đang là mối quan ngại cho con người và môi trường vì khả năng gây độc của chúng. Octylphenol là một trong những hợp chất tổng hợp được sử dụng phổ biến và thường xuyên trong những hoạt động của con người trong nhà và ngoài trời. Độc tính của octylphenol đối với thủy sinh vật, đặc biệt đối với động vật phù du (vd. Daphnia magna) mặc dù đã được nghiên cứu nhưng vẫn chưa được hiểu biết đầy đủ. Trong nghiên cứu này, chúng tôi đánh giá ảnh hưởng mãn tính của octylphenol ở các nồng độ 5, 50 và 500 µg/lít lên Daphnia magna trong thời gian 14 ngày. Kết quả cho thấy ở nồng độ octylphenol thấp (5 µg/lít) kích thích sự thành thục của sinh vật trong khi ở nồng độ cao hơn (50 và 500 µg/lít) gây chết đáng kể Daphnia. Bên cạnh đó, tất cả các nồng độ ocytlphenol dùng trong thí nghiệm gây ảnh hưởng nghiêm trọng lên sức sinh sản và sinh trưởng của sinh vật. Nghiên cứu về sự hiện diện, phân bố, phát tán và độc tính của những chất tổng hợp bao gồm octylphenol ở các nước đang phát triển nên được tiến hành vì mục tiêu bảo vệ sức khỏe con người, môi trường và hệ sinh thái.

The Word ‘Palstave’

Antiquity ◽  
1931 ◽  
Vol 5 (19) ◽  
pp. 322-329
Author(s):  
T. D. Kendrick
Keyword(s):  
18Th Century ◽  
Base Word ◽  
The Public ◽  
Frequent Use ◽  
To Come ◽  
Good Word ◽  
In The Beginning

I Suppose we are all agreed that ‘Celt’ is not a particularly brilliant name for a stone or bronze axe, even though we continue to use it. It survives, of course, not on its merits, but because we really do need a word other than ‘axe’ to denote these narrowedged prehistoric tools, and ‘Celt’ is at present the only substitute we have. We might, I mean, abolish the name Celt if only Celts looked a little more like axes; but we cannot, because there are many people in this world who do not like an axe to be called an axe unless it is the sort of axe they are accustomed to; whereas if you call a not easily recognizable axe a ‘Celt’ and make rather a fuss about explaining that you mean by this a prehistoric axe, then these same people will probably thank you very much indeed and say that it is all most interesting. In other words we keep on talking and writing about Celts because the public like the word; it is, after all, short and sweet, easy to remember, and devastatingly incomprehensible to the uninitiated. I feel that it is necessary for us to put up with ‘Celt’, and I am only remarking here that we know it is a base word of miserable, mistaken coinage. I ask simply that we do not pretend to ourselves that it is a good word on the grounds that it is oldestablished and familiar; it was a bad word in the beginning and it always will be a bad word, despite its now considerable antiquity and frequent use. Lots and lots of blacks do not make a white, not even if the oldest black is 18th century black.In addition to this name ‘Celt’ which we apply to most of our stone and bronze axes, we also have the group-name ‘palstave’ to distinguish the members of a particular species of the Celt genus. It is a very useful word and I do not think we could do without it, for though we can talk about ‘flat Celts’, ‘flanged Celts’, and ‘winged Celts’, no one has yet succeeded in substituting a snappy descriptive name like these for the palstave-variety of Celt. I should not dream, therefore, of suggesting that we get rid of ‘palstave’ and, indeed, I have myself a considerable affection for this curious word; but as so few of us know what it means or why it is the name of the prehistoric implements concerned, something may profitably be said about its history. That the word happens to come rather badly out of the enquiry is not, of course, my fault.

scholarly journals Bitumen and Bitumen Modification: A Review on Latest Advances

2019 ◽  
Vol 9 (4) ◽  
pp. 742 ◽  
Author(s):  
Michele Porto ◽  
Paolino Caputo ◽  
Valeria Loise ◽  
Shahin Eskandarsefat ◽  
Bagdat Teltayev ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Chemical Structure ◽  
Warm Mix Asphalt ◽  
Industrial Applications ◽  
The State ◽  
Engineering Properties ◽  
Bituminous Materials ◽  
Compatibility Of Polymers ◽  
Bitumen Modification

This synthesis explores the state-of-the-knowledge and state-of-the-practice regarding the latest updates on polymer-modified bitumens (PmBs). The information in this study was gathered from a thorough review of the latest papers in the literatures related to modified bituminous materials, technologies, and advances. For this purpose, the paper is presented in two principle sections. In the first part, the bitumen itself is investigated in terms of chemical structure and microstructural systems. In the second part, the paper focuses on bitumen modification from different aspects for assessing the effectiveness of the introduced additives and polymers for enhancing the engineering properties of bitumen in both paving and industrial applications. In conclusion, the knowledge obtained in this study has revealed the importance of the chemical composition of base bitumen for its modification. It can be declared that while some polymers/additives can improve one or some aspects of neat bitumen properties, they can lead to compatibility problems in storage and production. In this respect, several studies showed the effectiveness of waxes for improving the compatibility of polymers with bitumen in addition to some benefits regarding warm mix asphalt (WMA) production.

scholarly journals Resistant Starch Regulates Gut Microbiota: Structure, Biochemistry and Cell Signalling

2017 ◽  
Vol 42 (1) ◽  
pp. 306-318 ◽  
Author(s):  
Xiaoping Yang ◽  
Kwame Oteng Darko ◽  
Yanjun Huang ◽  
Caimei He ◽  
Huansheng Yang ◽  
...  
Keyword(s):  
Gut Microbiota ◽  
Resistant Starch ◽  
Chemical Structure ◽  
Animal Studies ◽  
Cell Signalling ◽  
Metabolic Dysfunction ◽  
Regulatory Effect ◽  
Gut Peptides ◽  
Remarkable Progress ◽  
Unique Chemical

Starch is one of the most popular nutritional sources for both human and animals. Due to the variation of its nutritional traits and biochemical specificities, starch has been classified into rapidly digestible, slowly digestible and resistant starch. Resistant starch has its own unique chemical structure, and various forms of resistant starch are commercially available. It has been found being a multiple-functional regulator for treating metabolic dysfunction. Different functions of resistant starch such as modulation of the gut microbiota, gut peptides, circulating growth factors, circulating inflammatory mediators have been characterized by animal studies and clinical trials. In this mini-review, recent remarkable progress in resistant starch on gut microbiota, particularly the effect of structure, biochemistry and cell signaling on nutrition has been summarized, with highlights on its regulatory effect on gut microbiota.

scholarly journals Relationship between Structure and Rheology of Hydrogels for Various Applications

Gels ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 255
Author(s):  
Gorjan Stojkov ◽  
Zafarjon Niyazov ◽  
Francesco Picchioni ◽  
Ranjita K. Bose
Keyword(s):  
Rheological Properties ◽  
Rheological Behavior ◽  
Chemical Structure ◽  
Industrial Applications ◽  
Rheological Characteristics ◽  
Frequency Sweep ◽  
The Relationship

Hydrogels have gained a lot of attention with their widespread use in different industrial applications. The versatility in the synthesis and the nature of the precursor reactants allow for a varying range of hydrogels with different mechanical and rheological properties. Understanding of the rheological behavior and the relationship between the chemical structure and the resulting properties is crucial, and is the focus of this review. Specifically, we include detailed discussion on the correlation between the rheological characteristics of hydrogels and their possible applications. Different rheological tests such as time, temperature and frequency sweep, among others, are described and the results of those tests are reported. The most prevalent applications of hydrogels are also discussed.

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