Characterization of the gene encoding the 10 kDa polypeptide of photosystem II fromArabidopsis thaliana

1991 ◽  
Vol 17 (3) ◽  
pp. 517-522 ◽  
Author(s):  
Gabriel Gil-G�mez ◽  
Pedro F. Marrero ◽  
Diego Haro ◽  
Jos� Ayt� ◽  
Fausto G. Hegardt
Keyword(s):  
Photosystem Ii ◽  
Gene Encoding

Characterization of photosystem II with the atomic-force microscope

1992 ◽  
Vol 50 (2) ◽  
pp. 1146-1147
Author(s):  
Kathleen M. Marr ◽  
Mary K. Lyon
Keyword(s):  
Photosystem Ii ◽  
Atomic Force Microscope ◽  
Three Dimensional ◽  
Biologically Active ◽  
Atomic Force ◽  
Freeze Etching ◽  
Image Averaging ◽  
Oxygen Evolving ◽  
Averaging Techniques

Photosystem II (PSII) is different from all other reaction centers in that it splits water to evolve oxygen and hydrogen ions. This unique ability to evolve oxygen is partly due to three oxygen evolving polypeptides (OEPs) associated with the PSII complex. Freeze etching on grana derived insideout membranes revealed that the OEPs contribute to the observed tetrameric nature of the PSIl particle; when the OEPs are removed, a distinct dimer emerges. Thus, the surface of the PSII complex changes dramatically upon removal of these polypeptides. The atomic force microscope (AFM) is ideal for examining surface topography. The instrument provides a topographical view of individual PSII complexes, giving relatively high resolution three-dimensional information without image averaging techniques. In addition, the use of a fluid cell allows a biologically active sample to be maintained under fully hydrated and physiologically buffered conditions. The OEPs associated with PSII may be sequentially removed, thereby changing the surface of the complex by one polypeptide at a time.

Phylogeny Characterization of Seb Gene Encoding Enterotoxins in Staphylococcus aureus Isolated from Raw Milk and Cheese

2019 ◽  
Vol 9 (o3) ◽  
Author(s):  
Fatima N. Aziz ◽  
Laith Abdul Hassan Mohammed-Jawad
Keyword(s):  
Staphylococcus Aureus ◽  
Food Poisoning ◽  
Raw Milk ◽  
Staphylococcal Enterotoxin B ◽  
Human Pathogen ◽  
Conventional Pcr ◽  
Biochemical Tests ◽  
Specific Primers ◽  
Gene Encoding

Food poisoning due to the bacteria is a big global problem in economically and human's health. This problem refers to an illness which is due to infection or the toxin exists in nature and the food that use. Milk is considered a nutritious food because it contains proteins and vitamins. The aim of this study is to detect and phylogeny characterization of staphylococcal enterotoxin B gene (Seb). A total of 200 milk and cheese samples were screened. One hundred ten isolates of Staphylococcus aureus pre-confirmed using selective and differential media with biochemical tests. Genomic DNA was extracted from the isolates and the SEB gene detects using conventional PCR with specific primers. Three staphylococcus aureus isolates were found to be positive for Seb gene using PCR and confirmed by sequencing. Sequence homology showed variety range of identity starting from (100% to 38%). Phylogenetic tree analyses show that samples (6 and 5) are correlated with S. epidermidis. This study discovered that isolates (A6-RLQ and A5-RLQ) are significantly clustered in a group with non- human pathogen Staphylococcus agnetis.

Characterization of a resolved oxygen-evolving Photosystem II preparation from spinach thylakoids

1983 ◽  
Vol 724 (2) ◽  
pp. 201-211 ◽  
Author(s):  
Eric Lam ◽  
Barbara Baltimore ◽  
William Ortiz ◽  
Susan Chollar ◽  
Anastasios Melis ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Oxygen Evolving ◽  
Spinach Thylakoids

scholarly journals Delta-(L-alpha-aminoadipyl)-L-cysteinyl-D-valine synthetase from Aspergillus nidulans. Molecular characterization of the acvA gene encoding the first enzyme of the penicillin biosynthetic pathway

1991 ◽  
Vol 266 (19) ◽  
pp. 12646-12654
Author(s):  
A.P. MacCabe ◽  
H. van Liempt ◽  
H. Palissa ◽  
S.E. Unkles ◽  
M.B. Riach ◽  
...  
Keyword(s):  
Aspergillus Nidulans ◽  
Molecular Characterization ◽  
Biosynthetic Pathway ◽  
Gene Encoding

scholarly journals Characterization of the human gene encoding ADP-ribosylation factor 1, a guanine nucleotide-binding activator of cholera toxin.

1992 ◽  
Vol 267 (13) ◽  
pp. 9028-9034
Author(s):  
C.M. Lee ◽  
R.S. Haun ◽  
S.C. Tsai ◽  
J Moss ◽  
M Vaughan
Keyword(s):  
Cholera Toxin ◽  
Human Gene ◽  
Nucleotide Binding ◽  
Guanine Nucleotide ◽  
Gene Encoding ◽  
Adp Ribosylation ◽  
Guanine Nucleotide Binding ◽  
Adp Ribosylation Factor

scholarly journals Cloning of the psbK gene from Synechocystis sp. PCC 6803 and characterization of photosystem II in mutants lacking PSII-K

1991 ◽  
Vol 266 (17) ◽  
pp. 11111-11115
Author(s):  
M. Ikeuchi ◽  
B. Eggers ◽  
G.Z. Shen ◽  
A. Webber ◽  
J.J. Yu ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Synechocystis Sp ◽  
Pcc 6803
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