Natural products obtained

This paper focuses on utilizing a dataset obtained from Amazon, comprising reviews spanning various product categories such as laptops, cameras and mobile phones. Following data preprocessing, we employ machine learning algorithms to classify the reviews as either positive or negative sentiment.

6p vithomson 02-07-2024 0 0   Download

In this research, palladium-catalyzed C-H bond halogenation of benzoxazinone derivatives has been achieved. This approach shows high regioselectivity and wide substrate scope, the products are obtained in moderate to good yields.

10p viohoyo 25-04-2024 2 2   Download

Ebook "Thermophilic carboxydotrophs and their applications in biotechnology" describes the products produced by carboxydotrophic bacteria and their biotechnological applications. Carbon monoxide (CO) is a widespread pollutant and a hazard to man because of its extremely toxic nature. It is a major component of some industrial gas mixtures and may be derived from coal. The carboxydotrophic bacteria obtain energy and carbon from the oxidation of CO. These organisms may be used to produce new metabolites, and the oxidases from them may be used to produce fuel cells and biosensors for CO.

137p manmanthanhla0201 26-02-2024 7 1   Download

The aim of research was to develop biopolymer films based on natural polysaccharides. For the first time, biodegradable films were obtained on the basis of a furcellaran-chitosan polyelectrolyte complex. The conditions for its formation were determined by measuring the zeta potential as a function of colloid pH, the size of pure components and their mixtures.

11p viginny 30-12-2022 10 2   Download

In our previous study, 10 compounds were isolated and structurally identified from the aerial part of Dianella ensifolia. Three of them (1, 2, and 4) were newly identified compounds and one (3) was obtained for the first time as natural product.

3p viericschmid 12-01-2022 16 0   Download

The results showed the particular monetary values of 11 WES obtained from 10 wetland ecosystems and total WES value in the study area. The outcome can become the scientific basis to choose the suitable solutions for sustainable use of natural resources in the relationship between preservation and exploitation of wetlands in the future.

11p meyerowitz 25-12-2021 9 0   Download

Natural and synthetic derivatives that contain an indole core are being used in medical treatments and technological processes. Therefore, the development of new synthetic methods for the synthesis of indole derivatives is very popular. In this study, new oxindoles with reaction of 4,7-dihydro-1H -indole (2) and isatin (4) were synthesized as analogs of natural product 3,3′ -bis(indolyl)oxindole.

32p tudichquannguyet 29-11-2021 10 1   Download

A series of cholesterol and based hydrophobic urea and thiourea compounds were synthesized and successfully used as a cocatalyst for L-proline catalyzed aldol reactions in the presence of water. The anticonfigured products were obtained with good yields (up to 94%), high diastereoselectivities (up to 95:5), and high enantiomeric excesses (up to 93% ee). The successful results for catalytic efficiency of L-proline in the presence of water reveal the importance of the hydrophobic nature of cholesterol and diosgenin parts of thiourea on the reactivity and selectivity in the presence of water.

28p tudichquannguyet 29-11-2021 12 1   Download

Herein, we proposed several mechanistic scenarios for activation of small molecules (NH3, CO2, CS2, H2, CH4, N2, and N2O) by a disilicon analogue of a vinyl anion (1H) using density functional theory (DFT) calculations. The DFT results established that all the possible reactions to yield a variety of potential products have an exergonic nature except for the activation of N2 with the obtained overall energy of ∆G = 33.6 kcal mol−1. Moreover, the highest exergonic character was ∆G = −95.8 kcal mol−1 for N2O.

113p tudichquannguyet 29-11-2021 7 1   Download

The HD-LBP–treated rats had high levels of SOD and low levels of MDA in their serum samples. Moreover, HD-LBP and drug-treated groups had a high number of SER receptors and BDNF-positive cells and a low number of TUNEL-positive cells in their hippocampal brain tissues. The HD-LBP treatments decrease anxious behavior by increasing antioxidant enzyme activities, hippocampal SER and BDNF neurotransmitter levels and decreasing the TUNEL-positive cell count of ovariectomized rats.

14p thiencuuchu 27-11-2021 10 1   Download

Herbal tea is often combined to create delicious taste with unique flavours and mainly enjoyed as a natural caffeine-free alternative to standard teas. In the present study, curry leaves based herbal tea were developed with the combination of moringa, amla, ginger, celery and sweet basil. The selected spices and herbs were subjected to drying conditions to obtain maximum retention of bioactive compounds. All the selected spices and herbs were dried by cabinet tray drying method to attain a brittle texture for easy blending. The herbal combination developed was packed as dip tea bags.

9p caygaocaolon11 21-04-2021 9 2   Download

Semi-synthesized products derived from natural compounds currently play an important role in the research and finding new substances. Allobetulin, obtained through a process of transformation from betulin, is compound extracted from the birch trees, could be used as the starting material for some transformation reactions. Some new derivatives containing heterocyclic moieties have been obtained via unique reactions. The results of our research are satisfactory and could be further investigated.

7p trinhthamhodang1218 18-03-2021 6 2   Download

Chickpea (Cicer arietinum L.) is one of the major pulses in human diet for essential source of inexpensive protein. Wilt disease is one of the major constraints in production of chickpea caused by Fusarium oxysporum f. sp. ciceri is widespread in chickpea growing areas resulting in considerable economic losses. Surveys were conducted during the rabi season of 2014-2015 and 2015-16 to obtain information on the distribution and natural incidence of chickpea wilt in the Agro-ecological condition of undulating red and lateritic zone of West Bengal, India.

7p cothumenhmong9 18-01-2021 11 1   Download

This thesis provides a list of natural enemy species for agricultural insect pests in Dong Thap Province. Data about morphological, biological, behavioral and ecological characteristics of A. calandrae parazitizing L. serricorne is also obtained. Besides, the ability to control S. zeamais and L. serricorne was shown in this study.

28p capheviahe26 25-01-2021 23 3   Download

Fermentation is a complicated process which depends on a variety of conditions. In order to gain high fermentation efficiency with a low level of toxins and impurities to obtain good products, it is essential to determine suitable conditions for the process. Within the scope of this study, the effects of some key conditions was estimated (i.e. pH, temperature, SO2 level in fermentation broth, the inoculation rates of yeast cells, sugar level) for the fermentation of corn with Saccharomyces cerevisiae MS42.

8p tamynhan9 02-12-2020 42 2   Download

Gum is natural biopolymers and formed via process of gummosis due to biotic and abiotic stresses i.e. injury, infection, drought, heat, high temperature, asby product of metabolic pathway and cannot re-enter in the system. Gum karaya (Sterculia urens Roxb.) is a dry deciduous tree belonging to the family Sterculiaceae distributed throughout India and Chhattisgarh. Karaya gum is the dried exudate obtained from trees of Sterculia species. Karaya gum is predominately used for many industries such as petroleum and gas, textiles, paper and pulp, pharmaceuticals, medicine and several other products.

9p angicungduoc8 07-11-2020 7 2   Download

The by-products obtained from the coconut industry goes out as waste and pollute the environment, if not properly managed. In order to convert these by-products such as coir pith and coco peat into a natural organic resource, it is processed and utilized as an economical input in agriculture as well as in horticulture. Processed coir pith is used as an excellent soil amendment because of its favourable physical properties in maintaining soil health.

8p trinhthamhodang1215 23-09-2020 9 1   Download

Cogen ash, a by-product of sugar mills obtained during co-generation process to produce heat and electrical energy by burning bagasse and/or coal was used to study its effect on growth and yield of paddy. The experiment was conducted in two sites at Bharathinagar, K.M. Doddi, Mandya during kharif 2014 with 13 treatments replicated thrice using randomized complete block design. The cogen ash collected from M/s Sri Chamundeshwari Sugars Ltd. was used in the study was more of silt sized, alkaline in nature with medium EC.

7p trinhthamhodang7 31-08-2020 22 1   Download

Microorganisms produce certain commercially important secondary metabolites like antibiotics, carotenoid pigments, toxins and so on, some of which are of commercial importance. Carotenoid is a group of pigment and its production is a natural phenomenon in case of certain microorganisms. Yeast is a unicellular eukaryotic organism occurring in soil, air, feed and fodder of dairy farm environment. Among yeast, Rhodotorula sp. produces both extra and intracellular carotenoid pigments.

5p trinhthamhodang7 31-08-2020 16 2   Download

The Aspergillus fungi have been an important source of natural products that are useful for exploration in medicine, agriculture and industry. In our continuous investigation to search for new antimicrobial agents from marine-derived fungi, one new phomaligol A2, together with three known compounds, wasabidienone E, aspertetranone D and mactanamide, were obtained from the EtOAc extract of the culture medium of the marine-derived fungus Aspergillus flocculosus (A. flocculosus) 01NT.1.1.5 isolated from the sponge Stylissa sp. at Nhatrang Bay, Vietnam.

7p nguyenxuankha_bevandan 14-08-2020 14 2   Download