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Search Results: 1 - 10 of 540006 matches for " Adriana P. M.;Arruda "
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Ultrasound-assisted extraction of Ca, K and Mg from in vitro citrus culture
Arruda, Sandra C. C.;Rodriguez, Adriana P. M.;Arruda, Marco A. Z.;
Journal of the Brazilian Chemical Society , 2003, DOI: 10.1590/S0103-50532003000300023
Abstract: an ultrasound extraction procedure for ca, k and mg from in vitro plant cultures is proposed, comparing cultures of different embryogenic levels of citrus sinensis and citrus limonia, employing ultrasound energy. parameters related to metals extraction, such as plant material sampling, acid concentration and sonication time were investigated. for accuracy check, the proposed ultrasound extraction procedure was compared with a microwave-assisted digestion procedure and no differences in the results were verified at 95% of the confidence level. with this simple and accurate extraction procedure, it was possible to determine differences in ca, k and mg concentrations during citrus embryo formation/development and between cultures (embryogenic and non-embryogenic). finally, the ultrasound extraction method demonstrated to be an excellent alternative for handless sampling and operational costs.
Ultrasound-assisted extraction of Ca, K and Mg from in vitro citrus culture
Arruda Sandra C. C.,Rodriguez Adriana P. M.,Arruda Marco A. Z.
Journal of the Brazilian Chemical Society , 2003,
Abstract: An ultrasound extraction procedure for Ca, K and Mg from in vitro plant cultures is proposed, comparing cultures of different embryogenic levels of Citrus sinensis and Citrus limonia, employing ultrasound energy. Parameters related to metals extraction, such as plant material sampling, acid concentration and sonication time were investigated. For accuracy check, the proposed ultrasound extraction procedure was compared with a microwave-assisted digestion procedure and no differences in the results were verified at 95% of the confidence level. With this simple and accurate extraction procedure, it was possible to determine differences in Ca, K and Mg concentrations during Citrus embryo formation/development and between cultures (embryogenic and non-embryogenic). Finally, the ultrasound extraction method demonstrated to be an excellent alternative for handless sampling and operational costs.
STUDY ON THE MEDIAN SACRAL ARTERY RAMIFICATION AND THE BODY TEMPERATURE OF THE ARMADILLO (Dasypus novemcinctus)
Arruda,O. S.; Arruda,M. S. P.;
Revista chilena de anatomía , 1999, DOI: 10.4067/S0716-98681999000200004
Abstract: el conjunto de vasos formados por la ramificación de la arteria sacral mediana fue estudiado en 20 armadillos (dasypus novemcinctus). este conjunto, que ha sido considerado una rete mirabile, se extiende desde la región sacral de la columna vertebral hasta la base de la cola. la conformación de las arterias y sus venas paralelas da origen a un sistema de contra-corriente que seguramente previene de la disipación de calor a través de la cola y, de esta manera, contribuye con los mecanismos del control de la temperatura corporal del armadillo
STUDY ON THE MEDIAN SACRAL ARTERY RAMIFICATION AND THE BODY TEMPERATURE OF THE ARMADILLO (Dasypus novemcinctus) ESTUDIO SOBRE LA RAMIFICACION DE LA ARTERIA SACRAL MEDIANA Y LA TEMPERATURA CORPORAL DEL ARMADILLO (Dasypus novemcinctus)
O. S. Arruda,M. S. P. Arruda
Revista chilena de anatomía , 1999,
Abstract: El conjunto de vasos formados por la ramificación de la arteria sacral mediana fue estudiado en 20 armadillos (Dasypus novemcinctus). Este conjunto, que ha sido considerado una rete mirabile, se extiende desde la región sacral de la columna vertebral hasta la base de la cola. La conformación de las arterias y sus venas paralelas da origen a un sistema de contra-corriente que seguramente previene de la disipación de calor a través de la cola y, de esta manera, contribuye con los mecanismos del control de la temperatura corporal del armadillo
Identification and Recovery of Volatiles Organic Compounds (VOCs) in the Coffee-Producing Wastewater  [PDF]
Alcilucia Oliveira, Lourdes M. C. Cabral, Humberto Bizzo, Neusa P. Arruda, Suely P. Freitas
Journal of Water Resource and Protection (JWARP) , 2014, DOI: 10.4236/jwarp.2014.64039
Abstract:

The objectives of the present study were to recover and identify volatiles organic compounds (VOCs) in the wastewater (WW) coming from a soluble coffee industrial plant. For VOCs recover, the WW was concentrated by pervaporation using a polydimethylsiloxane (PDMS) membrane. Furthermore, the solid phase micro extraction (SPME) and gas chromatography-mass spectrometry (GC-MS) were used for VOCs identification. The multivariate method of principal component analysis (PCA) was performed to evaluate differences amongst the feed and concentrate streams. Regarding the number of VOCs identified in the wastewater (33) and permeate (72), a significant statistical difference at p < 0.05 was observed. Clusters discriminating were clearly observed, as the feed and permeate streams are compared. Thus, we can conclude that pervaporation process using a PDMS membrane was effective to recover different class of VOCs present in the aqueous effluent and can be recommended for industrial wastewater treatment.

Role of Sentinel Lymph Node Biopsy in the Management of Merkel Cell Carcinoma
Eric P. Arruda,Kevin M. Higgins
Journal of Skin Cancer , 2012, DOI: 10.1155/2012/176173
Abstract: Merkel cell carcinoma (MCC) is a rare and typically aggressive form of skin cancer. It most commonly affects the elderly and has a predilection for the sun-exposed skin of the head and neck region. Other etiological factors include immune suppression, organ transplantation, and polyoma virus infection. MCC has a propensity to spread to regional lymphatics with a high locoregional recurrence rate. Since its discovery in 1972, treatment paradigms have shifted, with no consensus on optimal management strategies. Currently, standard of care includes surgical intervention to the primary and locoregional site with adjuvant radiotherapy for high-risk disease. In this paper, we discuss the history, pathology, and epidemiology of this rare disease with a focus on the evidentiary basis of treatment protocols. The use of sentinel lymph node biopsy as a management option will be the focus of this paper. 1. Introduction Merkel cell carcinoma (MCC) is a rare and aggressive neoplasia first described in 1972 by Toker [1]. First described as trabecular carcinoma of the skin as a consequence of its column-like growth pattern, MCC currently has many synonyms including cutaneous neuroendocrine carcinoma, and small-cell primary cutaneous carcinoma [2]. The discovery of neurosecretory granules in three of the original tumours studied by electon microscopy raised the possibility of a neuroendocrine source, and the MC was proposed as the cellular origin [3]. It has been shown that MC and MCC have overlapping electron microscopic features and immunohistochemical profiles which support the MC as the cellular origin of this aggressive tumour. The term Merkel cell carcinoma was coined by DeWoolf-Peters in 1980 and today remains the most accepted terminology [4]. The primary lesion of MCC is distinguished by its absence of distinctive clinical characteristics [4]. In general, MCC occurs more commonly in sun-exposed skin and in elderly individuals. The primary lesion presents as a rapidly growing, asymptomatic, reddish-blue dermal papule or nodule that develops over the course of weeks to months (Figure 1) [4]. The mnemonic AEIOU has been used to describe its clinical appearance and demographic characteristics: asymptomatic, expanding rapidly, immune suppression, older than 50 years, and ultraviolet-exposed/fair skin [5]. Rates of lymph node metastasis can be very high which affect the treatment decisions regarding the neck. Figure 1: Macroscopic appearance of Merkel cell carcinoma. (a) Surgical photo showing red, violaceous, and firm nodule with a smooth, elevated surface. Markings
Direct determination of plant-growth related metabolites by capillary electrophoresis with spectrophotometric UV detection
Assun??o, Nilson A.;Arruda, Sandra C. C.;Martinelli, Adriana P.;Carrilho, Emanuel;
Journal of the Brazilian Chemical Society , 2009, DOI: 10.1590/S0103-50532009000100027
Abstract: the detection of plant hormones and growth regulators is of great interest for many biological studies especially in the determination of metabolites related to plan growth and differentiation. in this work, we propose a simple method based on capillary electrophoresis (ce) for the separation of different classes of plant growth regulators such as auxins, cytokinins, gibberelic acid and abscisic acid. ce with uv detection was used and the analytical conditions were as follows: phosphate buffer 25 mmol l-1, for all the measurements and the separation conditions ph 12 or 2.5, by hydrodynamic injection 5 s at 10 cm and separation voltage of 22 kv. the absorbance detection was fixed at either 220 nm or 270 nm depending on a given phytohormone class. under these conditions, phytohormones (indole-3-acetic acid (iaa), gibberellic acid (ga3), abscisic acid (aba), picloram, zeatin and 6-benzylaminopurine (bap) were separated in approximately 3 to 5 min. the plant material used to verify the possibility of detection of hormone/plant growth regulators was citro (citrus sinensis l. osbeck) callus in the multiplication stage. in the plant tissue sample, zeatin was successfully detected. the results confirmed the potential use of ce as an efficient alternative and simple method to the classical procedures used for phytohormone detection in plant tissues.
The hamster cheek pouch: an immunologically privileged site suitable to the study of granulomatous infections
Arruda, M. S. P. de;Montenegro, M. R.;
Revista do Instituto de Medicina Tropical de S?o Paulo , 1995, DOI: 10.1590/S0036-46651995000400004
Abstract: the hamster check pouch is an invagination of oral mucosa, characterized histologically as skin-like. in this paper we describe anatomical, histological and embriological features of the pouch and coment on the pouch as an immunologically privileged site since it lacks lymphatic drainage and has few langerhans cells. we present the review from literature and our observations after inoculation in the pouch of mycobacteriae (bcg, mycobacterium tuberculosis and mycobacterium leprae) and a fungus (paracoccidioides brasiliensis). lesions in the pouch were granulomatous but smaller and long lasting; even granulomatous, the reaction was inefficient to control the proliferation of agents compared with inoculation in other sites, except for bcg. appearance of immunity was also delayed or absent and, when it was detected, a sharp decrease in number of agents in pouch lesions was observed. these observations make the pouch an interesting site for the study of the role of immune system in infeccious diseases and in granuloma formation.
Coumarins and Alkaloids from the Stems of Metrodorea Flavida
Baetas, Ana Cristina S.;Arruda, Mara S.P.;Müller, Adolfo H.;Arruda, Alberto C.;
Journal of the Brazilian Chemical Society , 1999, DOI: 10.1590/S0103-50531999000300004
Abstract: a new coumarin, 5,6-methylenedioxy-7,8-dimethoxycoumarin has been isolated from the stems of metrodorea flavida, as well as known coumarins and alkaloids. the structures of the new and the known compounds were established by spectral data and by comparison with the literature data.
Coumarins and Alkaloids from the Stems of Metrodorea Flavida
Baetas Ana Cristina S.,Arruda Mara S.P.,Müller Adolfo H.,Arruda Alberto C.
Journal of the Brazilian Chemical Society , 1999,
Abstract: A new coumarin, 5,6-methylenedioxy-7,8-dimethoxycoumarin has been isolated from the stems of Metrodorea flavida, as well as known coumarins and alkaloids. The structures of the new and the known compounds were established by spectral data and by comparison with the literature data.
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