A5067786337- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Biological Activity of Diterpenoids and Biflavonoids
- Synthesis and Reactivity of Heterocycles
- Phenothiazines and Benzothiazines Synthesis and Activities
- Chemical synthesis and alkaloids
- Synthetic Organic Chemistry Methods
- Asymmetric Synthesis and Catalysis
- Natural product bioactivities and synthesis
- Sesquiterpenes and Asteraceae Studies
- Bioactive Natural Diterpenoids Research
- Synthesis and Biological Evaluation
- Plant Toxicity and Pharmacological Properties
- Oxidative Organic Chemistry Reactions
- Marine Sponges and Natural Products
- Hydrocarbon exploration and reservoir analysis
- Chemical Synthesis and Reactions
- Crystallography and molecular interactions
- Phytochemicals and Medicinal Plants
- Ginkgo biloba and Cashew Applications
- Mechanical and Optical Resonators
- Synthesis and Biological Activity
- Phytochemistry and Bioactivity Studies
- Polymer Synthesis and Characterization
- Radioactive element chemistry and processing
Instituto de Aeronáutica e Espaço
2024
Universidade Federal do Rio de Janeiro
1982-2016
Universidade Estadual de Campinas (UNICAMP)
2016
Centro de Tecnologia da Informação Renato Archer
2012
Universidade Federal do Amazonas
2006
Universidad de Oviedo
1992
University of California, Davis
1966
Abstract Sounding rockets provide unique opportunities for microgravity and near-space research, but telemetry bandwidth limitations are a significant challenge to managing large volumes of dynamic vibration data during flight. The present study proposes novel hybrid DCT-modal analysis-based compression method specifically tailored sounding rocket subsystems, raising the scientific question whether incorporating mechanical properties, in this instance, modal analysis, can result more...
Indole alkaloids ellipticine (1), cryptolepine triflate (2a), rationally designed 11-(4-piperidinamino)cryptolepine hydrogen dichloride (2b) and olivacine (3) (an isomer of 1) were evaluated in vitro against Plasmodium falciparum vivo berghei-infected mice. 1-3 inhibited P. (IC₅₀≤1.4 μM, order activity: 2b>1>2a>3). In toxicity to murine macrophages was revealed selectivity indices (SI) 10-12 for 2a SI>2.8×10² 1, 2b 3. 1 administered orally at 50mg/kg/day highly active berghei (in inhibition...
SUMMARY The major changes noted in the roasting of cocoa beans are destruction amino acids and reducing sugars, followed by production volatile earbonyl compounds. relation between these reactions was demonstrated means acid analysis, titrimetric determination gas chromatography. It is postulated that majority compounds produced during course process result oxidative deamination free acids.
Free and bound volatile components of a Brazilian cashew apple variety (Anacardium occidentale L. var. nanum) were obtained by simultaneous distillation−extraction (SDE) XAD-2 adsorption. According to gas chromatography−mass spectrometry (GC-MS) analyses retention indices, 62 free constituents characterized quantified. They esters (40%), terpenes (20%), hydrocarbons (14%), fatty acids (9%), aldehydes (8%), alcohols (3%), lactones ketones (1%), phenols norisoprenoids (1%). The glycosidically...
Carbon steel corrosion in CO2-saturated solutions, simulating the produced water generated oil and gas extraction, was investigated using weight loss, electrochemical measurements surface characterization. The effectiveness of two isatin compounds, N-morpholine-isatin (MI) N-morpholine-3-isatin-thiosemicarbazone (MIT) as inhibitors these highly saline media also evaluated. Only MIT shown to act a inhibitor for carbon immersed both simulated solutions impedance results corroborated mechanisms...
The effect of trans-dehydrocrotonin (t-DCTN) from Croton cajucara Benth. was investigated in mice on Triton WR 1339 (tyloxapol)-induced hypercholesterolaemia and hypertriglyceridaemia. Mice treated with single application tyloxapol (400 mg/kg, i.p.) demonstrated significantly increased blood levels total cholesterol triglycerides at 24 h 48 after its injection, compared to normal controls. These increases were found be markedly suppressed animals orally 25 50 mg/kg t-DCTN or 100 gemfibrozil,...
Integrated volt/Var control (IVVC) is an important tool to optimize voltage and VAR resources improve energy efficiency and, therefore, plays role support the smart grid vision. This paper investigates application of vector machines (SVMs) switched capacitor banks regulators distribution systems in order minimize system losses maintain acceptable profile. The objective develop approach that can use voltage/current measurements provided by active reactive monitors IVVC without need perform...
Abstract This work evaluates the performance of compression algorithms based on discrete cosine transform (DCT) when used to encode sounding rockets’ vibration signals. Different methods that use three-step strategy (transform, quantization, and entropy encoder) are presented. The performances evaluated using relationship between rate distortion, latter being measured peak signal-to-noise ratio (PSNR) difference observed in power spectral density. focus is signals from rocket launches...
Fabrication and testing of micro-reactors for the characterization nanosensors is presented in this work. The reactors have a small volume (100 μl) are equipped with gas input/output channels. They were machined from single piece kovar order to avoid leaks system due additional welding. contact pins electrically insulated body reactor using borosilicate sealing glass was hermetically sealed lid an elastomeric o-ring. One advantages lies its simple assembly ease use any vacuum/gas system,...
Coral reefs are diverse ecosystems that have a high density of biodiversity leading to intense competition among species.These species may produce unknown substances, many with pharmacological value.Chromonephthea braziliensis is an invasive soft coral from the Indo-Pacific Ocean possibly transported by oil platforms and whose presence can be threat region's biodiversity.This produces secondary metabolites responsible for inducing damage local ecosystem.In present study, extracts ©FUNPEC-RP...
The study of microgravity, a condition in which an object experiences near-zero weight, is critical area research with far-reaching implications for various scientific disciplines. Microgravity allows scientists to investigate fundamental physical phenomena influenced by Earth’s gravitational forces, opening up new possibilities fields such as materials science, fluid dynamics, and biology. However, the complexity cost developing conducting microgravity missions have historically limited...
Cada vez com mais freqüência, os extratos das cascas do tronco árvores gênero Copaifera L. (Fabaceae-Caesalpinoideae) são utilizados pela população no tratamento de inflamações e tumores especialmente Norte Brasil. Apesar ter sido amplamente estudado, não há estudos relatando a composição da árvore. Estudos fitoquímicos langsdorfii Desf. permitiram o isolamento identificação dos ácidos ent-caurenóico betulínico como constituintes majoritários obtidos em hexano acetato etila, respectivamente,...
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at glance that was extracted from about 100 leading journals. To access of an article which published elsewhere, please select “Full Text” option. The original trackable via the “References”