| formation of extracellular 3-d-hydroxy-palmitic acid by saccharomycopsis malanga. | | 1974 | 4852079 |
| raphides with barbs and grooves in xanthosoma sagittifolium (araceae). | raphides in petioles of xanthosoma sagittifolium are needlelike crystals about 50 micrometers long. the rectangular cross sections have maximum dimensions of approximately 850 by 250 nanometers. the raphides have two distinct end structures. one end is narrow, acute, and tapered to a point; the other is broad, acute, and abruptly pointed. barbs, about 750 angstroms long with tips oriented away from the narrow end, occur along the length of the raphide on ridges on either side of two longitudinal ... | 1972 | 5078251 |
| [nutritive value of the malanga tuber (colocasia esculenta) for swine and chickens]. | | 1981 | 7332405 |
| the major tuber storage protein of araceae species is a lectin. characterization and molecular cloning of the lectin from arum maculatum l. | a new lectin was purified from tubers of arum maculatum l. by affinity chromatography on immobilized asialofetuin. although this lectin is also retained on mannose-sepharose 4b, under the appropriate conditions free mannose is a poor inhibitor of its agglutination activity. pure preparations of the arum lectin apparently yielded a single polypeptide band of approximately 12 kd upon sodium dodecyl sulfate-polyacrylamide gel electrophoresis. however, n-terminal sequencing of the purified protein c ... | 1995 | 7770523 |
| effect of some fungicides on extracellular enzymes of sclerotium rolfsii sacc. | the effect of four fungicides on rot of cocoyam tubers, vegetative growth and extracelluar enzymes of the pathogen was investigated. at 200 ppm concentration, rot was completely prevented by dithane m45. benomyl and iprodione in tubers of xanthosoma sagittifolium. there was better protection by the fungicides for cocoyam tubers treated with fungicides before spraying with hyphal suspension than those sprayed first with hyphal suspension of sclerotium rolfsii sacc. at 600 ppm, benomyl and iprodio ... | 1996 | 8766668 |
| changes in phenol oxidase and peroxidase levels in cocoyam tubers of different postharvest ages infected by sclerotium rolfsii sacc. | crude aqueous extracts from the peripheral rot zone of cocoyam tubers infected by sclerotium rolfsii sacc were shown to be inhibitory to dialysed in vivo polygalacturonase (pg) of the pathogen. the pg inhibitory action, phenol oxidase and peroxidase activities were higher in cocoyam tubers of the xanthosoma sagittifolium varieties than in those of the coolocasia esculenta varieties. the levels of phenol oxidase, peroxidase and pg inhibitory activities also decreased as the postharvest age of the ... | 1996 | 8975142 |
| dietary secondary amines and liver hepatoma in port harcourt, nigeria. | dietary secondary amines of some nigerian foodstuffs were analyzed by soxhlet extraction, using petroleum ether (b.p. 60-80 degrees c); followed by thin layer chromatography developed in a solvent system; n-butanol: 95% ethanol: water (4:2:1) for the qualitative test. each uv fluorescent band in the test chromatogram was scraped and eluted with distilled water, filtered and assayed for secondary amine content for the quantitative test. quantitative estimations were by the colorimetric methods. t ... | 1997 | 9629865 |
| xanthosoma sagittifolium tubers contain a lectin with two different types of carbohydrate-binding sites. | an unusual lectin possessing two distinctly different types of carbohydrate-combining sites was purified from tubers of xanthosoma sagittifolium l. by consecutive passage through two affinity columns, i.e. asialofetuin-sepharose and invertase-sepharose. sds-polyacrylamide gel electrophoresis, n-terminal amino acid sequencing, and gel filtration chromatography of the purified lectin showed that the x. sagittifolium lectin is a heterotetrameric protein composed of four 12-kda subunits (alpha(2)bet ... | 1999 | 10559206 |
| humoral immune responses to dna vaccines expressing secreted, membrane bound and non-secreted forms of the tania ovis 45w antigen. | the antibody response to dna vaccines expressing secreted, membrane bound and non-secreted forms of the same antigen was investigated. the antigen gene selected for these studies was the full length 45w antigen gene from taenia ovis. this gene encodes a host protective membrane bound antigen with a native secretion signal at the amino terminus and a hydrophobic anchor domain at the carboxyl terminus. full length and rationally truncated forms of the 45w antigen gene were generated and used to co ... | 2000 | 10775786 |
| [xanthan production by xanthomonas campestris in a non-conventional culture medium]. | among 3 varieties of xanthomonas campestris, the variety ocumo (x. campestris pv. ocumo), showed the greatest capacity for producing xanthan. this bacteria grows appropriately and produces this polysaccharide in a wide diversity of carbohydrate sources. however, this strain does not produce xanthan when the carbohydrate comes from lignocellulosic materials. the glucose syrup favepro was the carbon source that showed the best yield (23 g/l) with the greatest viscosity (7000 cps) of xanthan. the o ... | 1999 | 10974710 |
| bioprospecting for novel oxylipins in fungi: the presence of 3-hydroxy oxylipins in pilobolus. | as previously found in various members of the mucorales, 3-hydroxy oxylipins in mucor genevensis are associated with the sporangia, i.e. mainly the columella structure and between aggregating sporangiospores. to determine if this phenomenon is also true in distantly related members, the mucoralean fungus pilobolus was examined. this fungus is characterized by relatively large sub sporangial-columella structures which actively eject sporangia in a sticky liquid for attachment onto herbage surroun ... | 2001 | 11761371 |
| bioprospecting for novel hydroxyoxylipins in fungi: presence of 3-hydroxy palmitic acid in saccharomycopsis malanga. | electron microscopy studies indicated that the major oxylipin 3-hydroxy palmitic acid (16:0) was associated with aggregating vegetative cells and formed a web-like structure around these cells. cross sections through this structure showed a hydrophilic outer layer and a more hydrophobic inner layer suggesting that the web-like structure is in fact tube-like micelles. this information sheds more light on the role of these hydroxyoxylipins in fungi. | 2001 | 11827217 |
| lectin structure-activity: the story is never over. | advances in plant lectin biochemistry have made great strides during the past decade. technical advances in biophysical techniques and molecular biology, the availability of synthetic oligosaccharides, and characterization of lectins with unique carbohydrate-binding properties are responsible for these advances. studies in this laboratory support the view that interesting new discoveries are yet to be made. a new lectin was recently isolated from a fungus (polyporous squamosus) that recognizes t ... | 2002 | 12381155 |
| genetic structure of seventy cocoyam (xanthosoma sagittifolium, linn, schott) accessions in ghana based on rapd. | seventy cocoyam accessions collected from the eastern and volta regions of ghana were studied using rapd technique. ten primers were used to study the genetic diversity and structure of the experimental material and a total of 120 different bands were detected. levels of polymorphic fragments detected by the ten primers ranged from 69.2% to 100%. in the accessions from the eastern region, the mean observed and effective number of alleles per individual per population and mean nei's gene diversit ... | 2004 | 15061789 |
| glycaemic index of selected staples commonly eaten in the caribbean and the effects of boiling v. crushing. | integrating information about the glycaemic index (gi) of foods into the caribbean diet is limited by the lack of data. therefore, we determined the gi of eight staple foods eaten in the caribbean and the effect on gi of crushing selected tubers. groups of eight to ten healthy volunteers participated in three studies at two sites. gi was determined using a standard method with white bread and adjusted relative to glucose. the mean area under the glucose response curve elicited by white bread was ... | 2004 | 15182400 |
| malanga (xanthosoma sagittifolium) and purslane (portulaca oleracea) leaves reduce oxidative stress in vitamin a-deficient rats. | this study examined the ability of tropical vegetables to reduce oxidative stress induced by vitamin a deficiency. | 2004 | 15452401 |
| afferent projections to nucleus reuniens of the thalamus. | the nucleus reuniens (re) is the largest of the midline nuclei of the thalamus and the major source of thalamic afferents to the hippocampus and parahippocampal structures. nucleus reuniens has recently been shown to exert powerful excitatory actions on ca1 of the hippocampus. few reports on any species have examined afferent projections to nucleus reuniens. by using the retrograde anatomical tracer fluorogold, we examined patterns of afferent projections to re in the rat. we showed that re rece ... | 2004 | 15514932 |
| screening of antifungal agents using ethanol precipitation and bioautography of medicinal and food plants. | in the search for bioactive compounds, bioautography and ethanol precipitation of macromolecules (proteins, polysaccharides, etc.) of plant aqueous extracts were associated in an antifungal screening. thus, the supernatants, precipitates (obtained by ethanol precipitation) and aqueous extracts were investigated of medicinal and fruit bearing plants used against skin diseases by the brazilian population. the agar diffusion and broth dilution methods were used to assess the activity against three ... | 2004 | 15619579 |
| carotenoids from malanga (xanthosoma sagittifolium) leaves protect cells against oxidative stress in rats. | the present study investigated the effect of malanga leaf powder and its carotenoids oil extract on oxidative damage in rat tissues. a group of rats received ain-93g diet devoid of vitamin a (ad) and three other groups were treated with ad diet supplied with synthetic beta-carotene (beta-car) or malanga leaf powder (mp) or malanga carotenoids extract (ce). the diets' carotenoids bioavailability was determined through carotenoids intake/liver retinol content. lipid thiobarbituric acid reactive su ... | 2005 | 15929638 |
| loss of pectin is an early event during infection of cocoyam roots by pythium myriotylum. | cocoyam (xanthosoma sagittifolium) is an important tuber crop in most tropical zones of africa and america. in cameroon, its cultivation is hampered by a soil-borne fungus pythium myriotylum which is responsible for root rot disease. the mechanism of root colonisation by the fungus has yet to be elucidated. in this study, using microscopical and immunocytochemical methods, we provide a new evidence regarding the mode of action of the fungus and we describe the reaction of the plant to the early ... | 2006 | 16160840 |
| studies on the hydrothermal modifications of new cocoyam (xanthosoma sagittifolium) starch. | native new cocoyam starch (nncs) was subjected to annealing (ancs) and heat moisture treatment at 18% moisture level (h18ncs), 21% moisture level (h21ncs), 24% moisture level (h24ncs) and 27% moisture level (h27ncs) as hydrothermal treatments. scanning electron and light microscopy revealed round and polygonal shapes with sizes ranging from 15 to 40 microm for native and modified starches. nncs showed "a" pattern x-ray diffraction and no significant differences were observed in the x-ray pattern ... | 2006 | 16426676 |
| intraspecific variability of pythium myriotylum isolated from cocoyam and other host crops. | intraspecific variability within 51 isolates of pythium myriotylum from cocoyam (xanthosoma sagittifolium) and other host crops was analysed using optimum growth temperature, esterase banding patterns, aflps, rdna-its sequencing, and virulence to cocoyam. p. myriotylum isolates virulent to cocoyam could easily be differentiated from other isolates of p. myriotylum by their optimum growth temperature. isolates from cocoyam grew best at 28 degrees c with no growth at 37 degrees c, while p. myrioty ... | 2006 | 16546366 |
| removal of potassium from tuberous root vegetables by leaching. | to determine analytically the amount of potassium in raw tuberous root vegetables (trv); to estimate the amount of potassium that can be leached from raw trv by soaking in water; and to determine whether the duration of soaking and the cooking method selected affect potassium extraction. | 2006 | 17046614 |
| courage as a skill. | a division vice president blows the whistle on corruption at the highest levels of his company. a young manager refuses to work on her boss's pet project because she fears it will discredit the organization. a ceo urges his board, despite push back from powerful, hostile members, to invest in environmentally sustainable technology. what is behind such high-risk, often courageous acts? courage in business, the author has found, seldom resembles the heroic impulsiveness that sometimes surfaces in ... | 2007 | 17286075 |
| tania daniels on the minnesota alliance for patient safety. interview by susan v white. | | 2007 | 17849678 |
| production and characterization of xanthosoma sagittifolium and colocasia esculenta flours. | the physical proximate composition and physicochemical characteristics, microbiological stability, and in vitro alpha-amylolysis rate of flours produced by conventional dehydration techniques of the edible portions of the aroids xanthosoma sagittifolium and colocasia esculenta were investigated. flours from the edible portion of both tubers did not show significant statistical differences in moisture, aw, crude protein, total sugars, amylose, and amylopectin contents. c. esculenta flour showed h ... | 2007 | 17995692 |
| the glycemic index (gi) and glycemic load (gl) of five commonly consumed foods of the south pacific. | glycemic index (gi) has been widely used in the management of blood sugar levels among diabetes however; in the south pacific very little information regarding the gi of local foods is made available. the objectives of this research were to determine the glycemic index and the glycemic load of 5 south pacific foods, which have not been studied. the foods tested were plantain (musa aab), tannia (xanthosoma sagittifolium), roti or chappati, homemade pancake and lees cabin crackers. glucose powder ... | 2004 | 18181442 |
| phenazines and biosurfactants interact in the biological control of soil-borne diseases caused by pythium spp. | in this study, the putative role of phenazines and rhamnolipid-biosurfactants, antagonistic metabolites produced by pseudomonas aeruginosa pna1, was tested in the biological control of pythium splendens on bean (phaseolus vulgaris l) and pythium myriotylum on cocoyam (xanthosoma sagittifolium l schott). a rhamnolipid-deficient and a phenazine-deficient mutant of pna1 were used either separately or jointly in plant experiments. when the mutants were applied separately, no disease-suppressive effe ... | 2008 | 18237310 |
| the transforming mutation e17k/akt1 is not a major event in b-cell-derived lymphoid leukaemias. | despite the major role of the akt/pkb family of proteins in the regulation of many growth and survival mechanisms in the cell, and the increasing evidence suggesting that akt disruption could play a key role in many human malignancies, no major mutations of akt genes had been reported, until very recently when carpten et al reported a novel transforming mutation (e17k) in the pleckstrin homology domain of the akt1 gene in solid tumours. several laboratories are now screening for this mutation in ... | 2008 | 18665177 |
| cysticercosis in the democratic republic of congo. | cysticercosis, caused by taenia solium eggs, is a zoonotic disease whose consequences can be severe especially in the cerebral localisation (neuorcysticercosis). indeed, neurocysticercosis is the first cause of epilepsy amongst the infectious etiology group. following the increase of epilepsy cases in kinshasa and bas-congo, it was important to assess the fraction attributable to neurocysticercosis especially as data on cysticercosis in democratic republic of congo (drc) dating from 1970.a joint ... | 2012 | 23327408 |
| molecular characterization of dasheen mosaic virus isolates infecting edible aroids in india. | dasheen mosaic virus (dsmv) infecting three major edible aroids namely amorphophallus paeoniifolius, colocasia esculenta, and xanthosoma sagittifolium cultivated in india was characterized. infected plants showing typical dsmv symptoms were subjected to reverse transcription-polymerase chain reaction, and an amplification of a 963 bp fragment which encoded the coat protein (cp) gene was obtained. blast analysis of the cloned dna amplicon revealed the identity of the virus to be that of dsmv. seq ... | 2014 | 24717027 |
| plant regeneration and variabilities from tissue cultures of cocoyams (xanthosoma sagittifolium and x. violaceum). | callus cultures were initiated from apical meristems of two commercially cultivated species of cocoyam, xanthosoma sagittifolium and x. violaceum, on az medium supplemented with 2.0 mg 1(-1) 1-naphthaleneacetic acid (naa). organ differentiation was achieved from the friable, white callus by using ms medium containing 2.0 mg 1(-1) kinetin (kn) and 0.2-2.0 mg 1(-1) naa. this two-step system of plant regeneration could be reduced into one-step in x. violaceum by culturing the explants on ms medium ... | 1985 | 24253692 |
| physical, functional, and pasting properties of flours from corms of two cocoyam (colocasia esculenta and xanthosoma sagittifolium) cultivars. | physical, functional and physicochemical properties of flours of five cocoyam (colocasia spp and xanthosoma spp) cultivars were evaluated. colour (l*a*b*) parameters of corms and flours, pasting and functional properties of the flours were determined. xanthosoma spp showed significantly higher length (95.16-151.46), width (75.29-78.03) and weight (179.20-605.94) than the colocasia spp., but the parameters did not vary significantly within either xanthosoma and colocasia spp. generally, colour of ... | 2015 | 26028725 |
| taioba (xanthosoma sagittifolium) leaves: nutrient composition and physiological effects on healthy rats. | several studies have shown that fruits and vegetables contribute to protect against degenerative pathologies such as cardiovascular diseases, diabetes, and cancer, mainly due to the presence of dietary fiber (df) and polyphenols. taioba (xanthosoma sagittifolium) is an edible aroid widely grown in many parts of africa, america, and asia. the tubers portions of taioba are widely consumed; however, the leafy portions are generally discarded, despite their high nutritive value. in this study, we ha ... | 2013 | 24266602 |