Dimethyl Formamide
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. EFFECT OF POLY (N- VINYPYRROLIDONE) ON THE NON-ISOTHERMAL CRYSTALLIZATION KINETICS AND VISCOELASTIC PROPERTIES OF PVDF FILMS
Abstract Poly(vinylidene fluoride) (PVDF) and PVDF blends with various molecular weights of poly (N- vinylpyrrolidone) (PVP) films were prepared in dimethyl formamide through the solution casting method. Non-isothermal melt crystallization studies of PVDF films were carried out by cooling the molten samples at different temperatures using differential scanni
Braz. J. Chem. Eng.. Publicado em: 2016-12
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2. Comportamento sexual, parâmetros seminais e diluição pós-congelamento de sêmen de jumentos (Equus asinus) da raça Pêga / Sexual behavior, seminal parameters and dilution after freezing Pêga breed donkeys (Equus asinus) semen
The aim of this study was to elucidate aspects of asinine behavior from the description of various collections using an artificial vagina and relate this behavior with the seminal parameters. We evaluated also the availability of the formulation of the diluent T2-94 plus dimethylformamide in the protection of sperm cells during cryopreservation of semen from
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/03/2012
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3. Determination of traces of nitrate in water samples using spectrophotometric method after its preconcentration on microcrystalline naphthalene
Nitrate is quantitatively retained with 2,6-bis(4-methoxyphenyl)-4-phenyl pyrylium perchlorate (PPP) on microcrystalline naphthalene in the pH range of 6.5-9.0 from a large volume of aqueous solutions of various samples. The method was based on the complexation between PPP and nitrate and then, extraction of the resulted complex from aqueous solution by micr
Química Nova. Publicado em: 2011
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4. Uso de glicerol, metil-formamida e dimetil-formamida como crioprotetores do sêmen canino / Use of glycerol, methyl-formamide and dimethyl-formamide as cryoprotectants of canine semen
A crescente demanda por biotécnicas reprodutivas em cães tem despertado grande interesse no desenvolvimento de protocolos de congelação de sêmen canino que, associados à correta identificação do momento ótimo para a inseminação, resultem em taxas de fertilidade próximas às da inseminação artificial com sêmen fresco ou resfriado. A grande vant
Publicado em: 2008
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5. Avaliação "in vitro" da adição fracionada da dimetilformamida na criopreservação de sêmen equino
The aim of this research was to evaluate the efficacy of the manner of the cryoprotectant addition, one or multiple steps, and the cooling rate, on equine semen cryopreservation. The lesion intensity of the spermatozoa, during the process of the cryopreservation, was also studied. One ejaculate of nine stallions was used to test the modified INRA 82 with 5%
Publicado em: 2005
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6. Uso da dimetil-formamida associada ou não ao glicerol na criopreservação de sêmen caprino / The dimethyl formamide, associated or not with glycerol, use on goat semen cryopreservation.
The objetive of this study was to evaluate the dimethyl formamide and its association effects on the goat semen cryopreservation, through the semen physical analyses and complementary tests, carried out during the cryopreservation process. Alpine and Saanen bucks from the Federal University of Viçosa Dairy Goat Experimental Section- DZO were used. The semen
Publicado em: 2004
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7. Report on the presence of a toxic substance, dimethyl formamide, in sodium fluorescein used for fluorescein angiography.
The revelation that intravenous sodium fluorescein is not all that it might seem to be may be a significant finding in the light of the adverse reactions to fluorescein that have been previously reported. Analysis of commercially prepared intravenous sodium fluorescein by mass spectroscopy and nuclear magnetic resonance has indicated that an industrial solve
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8. Production, purification, and properties of a lipase from a bacterium (Pseudomonas aeruginosa YS-7) capable of growing in water-restricted environments.
An extracellular lipase from the low-water-tolerant bacterium P. aeruginosa YS-7 was produced, purified, and characterized with respect to its functional properties in aqueous solutions and organic solvents. The enzyme was partially released from the cells during fermentation in defined medium with 5% (wt/vol) soybean oil. Approximately one-half of the total
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9. A new chemical procedure for 32P-labeling of ribonucleic acids at their 5'-ends after isolation.
A new technique, which utilizes the chemical reaction between [32P]diimidazolidate of orthophosphate and the cetyltrimethylammonium salt of high-molecular-weight RNA in nonaqueous dimethyl formamide, has been developed for the 32P-labeling of RNAs after isolation. The radioactive label of high specific activity is introduced onto a phosphorylated 5'-end of t
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10. The synthesis of the internucleotide (phosphodiester) bond by a base-catalysed reaction.
Potassium tert-butoxide in hexamethyl phosphoramide and dimethyl formamide provides an excellent catalyst for the reaction of a 3'-hydroxyl or a 5'-hydroxyl group of a nucleoside with an appropriate nucleoside phosphorofluoridate to yield the dinucleoside phosphate. This paper describes the experiments leading to the development of this reaction together wit
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11. The enhancement of PCR amplification by low molecular weight amides
Amplification of a DNA target by the polymerase chain reaction (PCR) often requires laborious optimization efforts. In this regard, the use of certain organic chemicals such as dimethyl sulfoxide, polyethylene glycol, betaine and formamide as cosolvents has been found to be very helpful. Unfortunately, very little is known about the precise structural f
Oxford University Press.
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12. New specificity and yield enhancer of polymerase chain reactions
Tetramethylammonium (TMA) chloride, dimethyl sulfoxide and formamide are known to increase, under certain conditions, the specificity and efficiency of the polymerase chain reaction (PCR). We compared the ability of several TMA derivatives and some other reagents to increase the specificity of PCR and to improve the yield of amplification. A novel combinatio
Oxford University Press.