| 1526 matches found in 1136 documents. Search time: 3.865 seconds. |
|---|
|
Score: 17.00 |
|---|
| Title: Differential Accumulation of Salicylic Acid and Salicylic Acid-Sensitive Catalase in Different Rice it issues .
| | Author: Chen Z Iyer S Caplan A Klessig DF Fan B | | Journal: Citation: V : 114 ( 1 ) P : 193-201 Year: 1997 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub12223699 Accession (PMID): 12223699 | | Abstract: We previously proposed that salicylic acid ( SA ) -sensitive catalases serve as biological targets of SA in plant defense responses .
To further examine the role of SA-sensitive catalases , we have analyzed the relationship between SA levels and SA sensitivity of catalases in different rice ( Oryza sativa ) it issues .
We show here that , whereas rice shoots contain extremely high levels of free SA , as previously reported ( I Raskin , H Skubatz , W Tang , BJD Meeuse [ 1990 ] Ann Bot 66 : 369-373 ; P Silverman , M Seskar , D Kanter , P Schweizer , J-P Metraux , I Raskin [ 1995 ] Plant Physiol 108 : 633-639 ) , rice roots and cell-suspension cultures have very low SA levels .
Catalases from different rice it issues also exhibit differences in sensitivity to SA .
Catalase from rice shoots is insensitive to SA , but roots and cell-suspension cultures contain SA-sensitive catalase .
The difference in SA sensitivity of catalases from these different it issues correlates with the it issue-specific expression of two catalase genes , CatA and CatB , which encode highly distinctive catalase proteins .
CatA , which encodes a catalase with relatively low sequence homology to the tobacco SA-sensitive catalases , is expressed at high levels exclusively in the shoots .
On the other hand , in roots and cell-suspension cultures , with northern analysis we detected expression of only the CatB gene , which encodes a catalase with higher sequence homology to tobacco catalases .
The role of catalases in mediating some of the SA-induced responses is discussed in light of these results and the recently defined mechanisms of catalase inhibition by SA . | Matching Sentences:
[ Sen. 6, subscore: 4.00 ]: The difference in SA sensitivity of catalases from these different it issues correlates with the it issue-specific expression of two catalase genes , CatA and CatB , which encode highly distinctive catalase proteins .
[ Sen. 7, subscore: 3.00 ]: CatA , which encodes a catalase with relatively low sequence homology to the tobacco SA-sensitive catalases , is expressed at high levels exclusively in the shoots .
[ Sen. 2, subscore: 2.00 ]: To further examine the role of SA-sensitive catalases , we have analyzed the relationship between SA levels and SA sensitivity of catalases in different rice ( Oryza sativa ) it issues .
[ Sen. 5, subscore: 2.00 ]: Catalase from rice shoots is insensitive to SA , but roots and cell-suspension cultures contain SA-sensitive catalase .
[ Sen. 8, subscore: 2.00 ]: On the other hand , in roots and cell-suspension cultures , with northern analysis we detected expression of only the CatB gene , which encodes a catalase with higher sequence homology to tobacco catalases .
[ Sen. 9, subscore: 2.00 ]: The role of catalases in mediating some of the SA-induced responses is discussed in light of these results and the recently defined mechanisms of catalase inhibition by SA .
[ Sen. 1, subscore: 1.00 ]: We previously proposed that salicylic acid ( SA ) -sensitive catalases serve as biological targets of SA in plant defense responses .
[ Sen. 4, subscore: 1.00 ]: Catalases from different rice it issues also exhibit differences in sensitivity to SA .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 16.00 |
|---|
| Title: Molecular evolution of maize catalases and their relationship to other eukaryotic and prokaryotic catalases .
| | Author: Guan L Scandalios JG .
| | Journal: J Mol .
Evol Citation: V : 42 ( 5 ) P : 570-9 Year: 1996 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub8662009 Accession (PMID): 8662009 | | Abstract: We have compared the nucleotide and protein sequences of the three maize catalase genes with other plant catalases to reconstruct the evolutionary relationship among these catalases .
These sequences were also compared with other eukaryotic and prokaryotic catalases .
Phylogenies based on distances and parsimony analysis show that all plant catalases derive from a common ancestral catalase gene and can be divided into three distinct groups .
The first , and major , group includes maize Cat1 , barley Cat1 , rice CatB , and most of the dicot catalases .
The second group is an apparent dicot-specific catalase group encompassing the tobacco Cat2 and tomato Cat .
The third is a monocot-specific catalase class including the maize Cat3 , barley Cat2 , and rice CatA .
The maize Cat2 gene is loosely related to the first group .
The distinctive features of monocot-specific catalases are their extreme high codon bias at the third position and low degree of sequence similarity to other plant catalases .
Similarities in the intron positions for several plant catalase genes support the conclusion of derivation from a common ancestral gene .
The similar intron position between bean catalases and human catalase implies that the animal and plant catalases might have derived from a common progenitor gene sequence .
| Matching Sentences:
[ Sen. 1, subscore: 3.00 ]: We have compared the nucleotide and protein sequences of the three maize catalase genes with other plant catalases to reconstruct the evolutionary relationship among these catalases .
[ Sen. 10, subscore: 3.00 ]: The similar intron position between bean catalases and human catalase implies that the animal and plant catalases might have derived from a common progenitor gene sequence .
[ Sen. 3, subscore: 2.00 ]: Phylogenies based on distances and parsimony analysis show that all plant catalases derive from a common ancestral catalase gene and can be divided into three distinct groups .
[ Sen. 6, subscore: 2.00 ]: The third is a monocot-specific catalase class including the maize Cat3 , barley Cat2 , and rice CatA .
[ Sen. 8, subscore: 2.00 ]: The distinctive features of monocot-specific catalases are their extreme high codon bias at the third position and low degree of sequence similarity to other plant catalases .
[ Sen. 2, subscore: 1.00 ]: These sequences were also compared with other eukaryotic and prokaryotic catalases .
[ Sen. 4, subscore: 1.00 ]: The first , and major , group includes maize Cat1 , barley Cat1 , rice CatB , and most of the dicot catalases .
[ Sen. 5, subscore: 1.00 ]: The second group is an apparent dicot-specific catalase group encompassing the tobacco Cat2 and tomato Cat .
[ Sen. 9, subscore: 1.00 ]: Similarities in the intron positions for several plant catalase genes support the conclusion of derivation from a common ancestral gene .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 12.00 |
|---|
| Title: Catalytic pyrolysis of waste rice husk over mesoporous materials .
| | Author: Jeon MJ Kim SS Jeon JK Park SH Kim JM Sohn JM Lee SH Park YK | | Journal: Nanoscale Res Lett Citation: V : 7 P : 18 Year: 2012 Type: Publisher | | Literature: oryza Field: abstract Doc ID: pub22221540 Accession (PMID): 22221540 | | Abstract: ABSTRACT : Catalytic fast pyrolysis of waste rice husk was carried out using pyrolysis-gas chromatography/mass spectrometry [ Py-GC/MS ] .
Meso-MFI zeolite [ Meso-MFI ] was used as the catalyst In addition , a 0 . 5-wt . % platinum [ Pt ] was ion-exchanged into Meso-MFI to examine the effect of Pt addition .
Using a catalytic upgrading method , the activities of the catalysts were evaluated in terms of product composition and deoxygenation .
The structure and acid site characteristics of the catalysts were analyzed by Brunauer-Emmett-Teller surface area measurement and NH3 temperature-programmed desorption analysis .
Catalytic upgrading reduced the amount of oxygenates in the product vapor due to the cracking reaction of the catalysts .
Levoglucosan , a polymeric oxygenate species , was completely decomposed without being detected .
While the amount of heavy phenols was reduced by catalytic upgrading , the amount of light phenols was increased because of the catalytic cracking of heavy phenols into light phenols and aromatics .
The amount of aromatics increased remarkably as a result of catalytic upgrading , which is attributed to the strong Bronsted acid sites and the shape selectivity of the Meso-MFI catalyst The addition of Pt made the Meso-MFI catalyst even more active in deoxygenation and in the production of aromatics .
| Matching Sentences:
[ Sen. 8, subscore: 3.00 ]: The amount of aromatics increased remarkably as a result of catalytic upgrading , which is attributed to the strong Bronsted acid sites and the shape selectivity of the Meso-MFI catalyst The addition of Pt made the Meso-MFI catalyst even more active in deoxygenation and in the production of aromatics .
[ Sen. 3, subscore: 2.00 ]: Using a catalytic upgrading method , the activities of the catalysts were evaluated in terms of product composition and deoxygenation .
[ Sen. 5, subscore: 2.00 ]: Catalytic upgrading reduced the amount of oxygenates in the product vapor due to the cracking reaction of the catalysts .
[ Sen. 7, subscore: 2.00 ]: While the amount of heavy phenols was reduced by catalytic upgrading , the amount of light phenols was increased because of the catalytic cracking of heavy phenols into light phenols and aromatics .
[ Sen. 1, subscore: 1.00 ]: ABSTRACT : Catalytic fast pyrolysis of waste rice husk was carried out using pyrolysis-gas chromatography/mass spectrometry [ Py-GC/MS ] .
[ Sen. 2, subscore: 1.00 ]: Meso-MFI zeolite [ Meso-MFI ] was used as the catalyst In addition , a 0 . 5-wt . % platinum [ Pt ] was ion-exchanged into Meso-MFI to examine the effect of Pt addition .
[ Sen. 4, subscore: 1.00 ]: The structure and acid site characteristics of the catalysts were analyzed by Brunauer-Emmett-Teller surface area measurement and NH3 temperature-programmed desorption analysis .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 11.00 |
|---|
| Title: A rural population based case-control study of senile cataract in India .
| | Author: Sreenivas V Prabhakar AK Badrinath SS Fernandez T Roy IS Sharma T Shah B | | Journal: Citation: V : 9 ( 5 ) P : 327-36 Year: 1999 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub10616266 Accession (PMID): 10616266 | | Abstract: PURPOSE : Senile cataract contributes to 75% of blindness in India and there is a growing backlog of cataract cases needing surgery .
The present study seeks clues to the etiology of senile cataract , so that strategies to prevent or even delay cataract formation could be planned .
METHODS : Using a community based case-control design , 258 cases & 308 controls from one centre and 301 cases & 591 controls from another were studied .
The subjects were from rural areas and were aged 40-60 years .
Logistic regression analysis technique was employed to study the associations between senile cataract and various variables .
RESULTS : Systolic blood pressure , duration of exposure to sunlight per day were associated with senile cataract in both the centres ( OR = 1 . 4 & 1 . 5 for systolic BP and 1 . 6 & 1 . 4 for exposure to sunlight ) .
Utilization of rice gruel ( OR = 0 . 5 ) , duration of exposure to fire & dust per day ( OR = 1 . 8 ) , family history of cataract ( OR = 5 . 0 ) , use of cheap cooking fuels ( OR = 1 . 8 ) , increased height ( OR = 0 . 7 ) and increased number of hours of work per day ( OR = 0 . 7 ) were other variables that showed significant association in either of the centres .
CONCLUSION : Senile cataract appears to have a multi factorial etiology .
Though the study provided some clues to the etiology of senile cataract , further studies are needed to know the specific role of these factors in the causation of cataract , so that any preventive or control measures could be initiated in the community .
Till such time , we have to fall back on the available surgical approach in control of senile cataract . | Matching Sentences:
[ Sen. 1, subscore: 2.00 ]: PURPOSE : Senile cataract contributes to 75% of blindness in India and there is a growing backlog of cataract cases needing surgery .
[ Sen. 2, subscore: 2.00 ]: The present study seeks clues to the etiology of senile cataract , so that strategies to prevent or even delay cataract formation could be planned .
[ Sen. 9, subscore: 2.00 ]: Though the study provided some clues to the etiology of senile cataract , further studies are needed to know the specific role of these factors in the causation of cataract , so that any preventive or control measures could be initiated in the community .
[ Sen. 5, subscore: 1.00 ]: Logistic regression analysis technique was employed to study the associations between senile cataract and various variables .
[ Sen. 6, subscore: 1.00 ]: RESULTS : Systolic blood pressure , duration of exposure to sunlight per day were associated with senile cataract in both the centres ( OR = 1 . 4 & 1 . 5 for systolic BP and 1 . 6 & 1 . 4 for exposure to sunlight ) .
[ Sen. 7, subscore: 1.00 ]: Utilization of rice gruel ( OR = 0 . 5 ) , duration of exposure to fire & dust per day ( OR = 1 . 8 ) , family history of cataract ( OR = 5 . 0 ) , use of cheap cooking fuels ( OR = 1 . 8 ) , increased height ( OR = 0 . 7 ) and increased number of hours of work per day ( OR = 0 . 7 ) were other variables that showed significant association in either of the centres .
[ Sen. 8, subscore: 1.00 ]: CONCLUSION : Senile cataract appears to have a multi factorial etiology .
[ Sen. 10, subscore: 1.00 ]: Till such time , we have to fall back on the available surgical approach in control of senile cataract .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 10.00 |
|---|
| Title: Cloning and characterization of the rice CatA catalase gene , a homologue of the maize Cat3 gene .
| | Author: Higo K Higo H | | Journal: Plant Mol . Biol . Citation: V : 30 ( 3 ) P : 505-21 Year: 1996 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub8605302 Accession (PMID): 8605302 | | Abstract: We isolated and sequenced a genomic clone ( CatA ) encoding CAT-A catalase , a homologue of the maize catalase isozyme 3 ( CAT-3 ) from rice ( Oryza sativa L ) .
The 5-upstream non-coding region had very low similarity with the maize Cat3 gene and possible cis elements and sequence motifs in the maize Cat3 gene were not evident , except for TATA and CAAT motifs .
Several sequence motifs found in the promoters of plant seed-specific genes were identified in the 5-upstream non-coding region of the CatA gene .
Northern blotting showed that the CatA gene is expressed at high levels in seeds during early development and also in young seedlings .
Methyl viologen ( paraquat ) resulted in the 3-fold induction of the CatA gene in the leaves of young seedlings , whereas abscisic acid , wounding , salicylic acid , and hydrogen peroxide had no or only slight effects .
The 1 . 9 kb 5-upstream fragment ( -1559 to +342 ) of the CatA gene was fused with the Escherichia coli beta-glucuronidase ( GUS ) gene and introduced by electroporation into protoplasts prepared from rice suspension-cultured cells , then the transient expression of the GUS gene was examined .
Deletion analysis of this chimeric gene suggested that a weak silencer is located in the region between -1564 to -699 .
Abscisic acid ( ABA ) at a final concentration of 10 ( -6 ) M doubled GUS activity in protoplasts electroporated with the chimeric DNAs having 1 . 9 to 1 . 2 kb 5-upstream regions .
A sequence highly similar to the Sph box , a motif found in genes modulated by ABA , was found at -266 to -254 .
Deletion of this region however , did not eliminate the responsiveness to ABA .
Expression of the chimeric gene in the protoplasts was not enhanced by stress such as low and high temperature , hydrogen peroxide , methyl viologen , salicylic acid , elicitor , and UV light .
The chimeric CatA-GUS plasmid DNAs amplified in the methylation-positive strain , E coli DH5alpha , showed GUS gene activities , whereas all the chimeric DNAs amplified in the methylation-deficient E coli JM110 were completely inactive in the presence or absence of ABA in the culture medium .
DNA methylation , especially of either one or both of the deoxyadenosines at the two GATC motifs ( one in the first exon and the other in the first intron of the rice CatA gene ) , appeared to be responsible for the CatA promoter activity identified in the transient assay . | Matching Sentences:
[ Sen. 1, subscore: 3.00 ]: We isolated and sequenced a genomic clone ( CatA ) encoding CAT-A catalase , a homologue of the maize catalase isozyme 3 ( CAT-3 ) from rice ( Oryza sativa L ) .
[ Sen. 13, subscore: 2.00 ]: DNA methylation , especially of either one or both of the deoxyadenosines at the two GATC motifs ( one in the first exon and the other in the first intron of the rice CatA gene ) , appeared to be responsible for the CatA promoter activity identified in the transient assay .
[ Sen. 3, subscore: 1.00 ]: Several sequence motifs found in the promoters of plant seed-specific genes were identified in the 5-upstream non-coding region of the CatA gene .
[ Sen. 4, subscore: 1.00 ]: Northern blotting showed that the CatA gene is expressed at high levels in seeds during early development and also in young seedlings .
[ Sen. 5, subscore: 1.00 ]: Methyl viologen ( paraquat ) resulted in the 3-fold induction of the CatA gene in the leaves of young seedlings , whereas abscisic acid , wounding , salicylic acid , and hydrogen peroxide had no or only slight effects .
[ Sen. 6, subscore: 1.00 ]: The 1 . 9 kb 5-upstream fragment ( -1559 to +342 ) of the CatA gene was fused with the Escherichia coli beta-glucuronidase ( GUS ) gene and introduced by electroporation into protoplasts prepared from rice suspension-cultured cells , then the transient expression of the GUS gene was examined .
[ Sen. 12, subscore: 1.00 ]: The chimeric CatA-GUS plasmid DNAs amplified in the methylation-positive strain , E coli DH5alpha , showed GUS gene activities , whereas all the chimeric DNAs amplified in the methylation-deficient E coli JM110 were completely inactive in the presence or absence of ABA in the culture medium .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
