LINDSAY G. ROSS¹, CARLOS A. MARTÍNEZ-PALACIOS², MARIA LUISA RODRÍGUEZ DE SOUSA³, ANTONIO CAMPOS-MENDOZA²

BIOCELL, Vol.30, Suppl.S, pp. 119-120, 2006

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G.M. SOMOZA, L.A. MIRANDA, L.G. GUILGUR, P.H. STROBL-MAZZULLA

BIOCELL, Vol.30, Suppl.S, pp. 89-95, 2006

Abstract This article has no abstract. More >

MARCOS S. DREON¹, HORACIO HERAS^1,2, RICARDO J. POLLERO¹

BIOCELL, Vol.30, Suppl.S, pp. 359-365, 2006

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ALEJANDRA L. ESTEBENET^✝, PABLO R. MARTÍN, SILVANA BURELA

BIOCELL, Vol.30, Suppl.S, pp. 329-335, 2006

Abstract This article has no abstract. More >

NÉSTOR CURVETTO1^1,2, PABLO MARINANGELI^1,2, GABRIELA MOCKEL²

BIOCELL, Vol.30, No.3, pp. 497-500, 2006, DOI:10.32604/biocell.2006.30.497

Abstract The micropropagation of Lilium longiflorum requires adequate equipment which may not be afforded by small laboratories or producers. In this work we compared traditional methodology with a protocol that included easily available elements to sterilize materials and culture media, together with addition of hydrogen peroxide (H₂O₂ ) into the nutrient media as chemical sterilizer. A series of H₂O₂ concentrations (0.005, 0.010, 0.015 and 0.020% p/v) was used to control contamination during in vitro establishment and subsequent cultivation; the explant organogenic response was also examined and compared to the traditional micropropagation technique. The level of culture contamination was within… More >

KARINA M. MICHETTI^1,2, PATRICIA I. LEONARDI^1,3, EDUARDO J. CÁCERES^1,4

BIOCELL, Vol.30, No.3, pp. 491-496, 2006, DOI:10.32604/biocell.2006.30.491

Abstract Nonspecific acid phosphatases are a group of enzymes whose activity increases the availability of exogenous and endogenous orthophosphate either through extra- or intracellular hydrolysis of phosphate compounds. Our study demonstrates the activity of acid phosphatases in the filamentous freshwater alga Stigeoclonium tenue. These enzymes were detected following a cerium-based method in which cerium was used as an orthophosphate-capture reagent. In thalli from S. tenue from the natural environment, acid phosphatases were found in the longitudinal cell wall, plasmalemma, and vacuole. In thalli from Bold’s Basal Medium culture, these enzymes were found mainly in the plasmalemma; they were More >

GREGOR KOSEC^*¶, VANINA ALVAREZ^**¶, JUAN J. CAZZULO**

BIOCELL, Vol.30, No.3, pp. 479-490, 2006, DOI:10.32604/biocell.2006.30.479

Abstract Trypanosoma cruzi, the parasite causing Chagas disease, contains a number of proteolytic enzymes. The recent completion of the genome sequence of the T. cruzi CL Brener clone suggests the presence of 70 cysteine peptidases, 40 serine peptidases (none of them from the chymotrypsin family), about 250 metallopeptidases (most leishmanolysin homologues), 25 threonine peptidases, and only two aspartyl peptidases, none of them from the pepsin family. The cysteine peptidases belong to 7 families of Clan CA, 3 families of Clan CD, and one each of Clans CE and CF. In Clan CA, the C1 family is represented by More >

ANDREA BOZZO*, CARLOS ALBERTO SOÑEZ*, MARÍA TERESA MUGNAINI*, ISABEL CECILIA PASTORINO*, ALICIA NÉLIDA ROLANDO*, MARÍA CRISTINA ROMANINI*, HÉCTOR FERNANDO GAUNA**

BIOCELL, Vol.30, No.3, pp. 439-445, 2006, DOI:10.32604/biocell.2006.30.439

Abstract Chronic stress by immobilization during gestation can alter several mechanisms that maintain homeostasis in adrenal gland. The aim of this work was to quantify the apoptotic index of adrenal cortex during mid-pregnancy and to prove cytological characteristics by electron microscopy. The apoptotic index did not present significant differences between the adrenal cortex areas of control and experimental rats in any of the three ages studied. The day of gestation influenced significantly on the apoptotic index in both groups. This index increased as gestation progressed. It may be concluded that chronic stress by immobilization might induce More >

M.E. RÜTTLER, C.S. YANZÓN, M.J. CUITIÑO, N.F. RENNA, M.A. PIZARRO, A.M. ORTIZ.

BIOCELL, Vol.30, No.2, pp. 301-308, 2006, DOI:10.32604/biocell.2006.30.301

Abstract Enteroaggregative Escherichia coli (EAEC) has been implicated in sporadic diarrhea in children and adults and has been identified as the cause of several outbreaks worldwide. The HEp-2 test remains the gold standard for identification of this pathotype. A 60-65 MDa plasmid encodes the aggregative adherence fimbriae (AAF/I and AAF/II), a transcriptional activator (aggR gene), the enteroaggregative heat-stable enterotoxin EAST1 (astA gene) and a cytotoxin (Pet). The standard assay for EAEC is performed only in research laboratories, because it is expensive, labor intensive and time-consuming. The Polymerase Chain Reaction (PCR) offers the possibility of rapid diagnosis. In the… More >

R. B. SCIURANO, M.S. MERANI, JIMENA BUSTOS, A.J. SOLARI

BIOCELL, Vol.30, No.1, pp. 57-66, 2006, DOI:10.32604/biocell.2006.30.057

Abstract Spermatocytes from the two armadillo species, C. villosus and D. hybridus were studied in microspreads for synaptonemal complexes (SCs) and in thin sections for electron microscopy (EM). The complete SC karyotype generally agrees with previous reports on mitotic chromosomes, except for the sex chromosomes. The X chromosome is submetacentric in both species and the Y is the shortest one in C. villosus and the second shortest in D. hybridus, and an extremely acrocentric one. A SC is formed along the total length of the Y chromosome, and this SC persists along all the pachytene substages. A single recombination nodule… More >