The D-ribulokinase and D-xylulokinase of Klebsiella aerogenes were purified to homogeneity from Escherichia coli K12 construct strains that synthesized these enzymes constitutively. The D-ribulokinase, which is encoded in the ribitol operon, is active as a dimer of 60 000 subunit mol.wt., whereas the D-xylulokinase, which is encoded in the D-arabitol operon, is active as a dimer of 54 000 subun...

PURPOSE To determine whether complement-derived SC5b-9, the soluble nonlytic-fluid phase of the membrane attack complex, can be generated in normal human corneas when they are injured with lipopolysaccharide (LPS), ribitol teichoic acid (RTA) immune complexes, acid, or alkali. METHODS The experimental cornea of each donor pair was injected with 50 microliters of sterile saline containing 0.5 ...

BACKGROUND Protection against Haemophilus influenzae type b (Hib), a rapidly invading encapsulated bacteria, is dependent on maintenance of an adequate level of serum antibody through early childhood. In many countries, Hib vaccine booster doses have been implemented after infant immunization to sustain immunity. We investigated the long-term persistence of antibody and immunological memory in ...

conclusions prp dressing could significantly decrease the depth and surface area of dfus in a three-week period. background some of the studies confirmed the effectiveness of platelet rich plasma (prp) in the treatment of diabetic foot ulcers (dfu). however, these studies had small sample size and used different methods such as prp gel or prp injections. the results are also contraversial. obje...

Although platelet-rich plasma (PRP) is the plasma fraction that contains higher levels of platelet-sequestered proteins such as growth factors and chemokines, it is also abundant in bioactive lipids whose role in wound healing has not been well characterized. This study provides a preliminary evaluation for the effect of the lipid component of PRP on selected genes related to wound healing. Spr...

background cartilage tissue has limited regenerative capacity and the management of cartilage defects has always been a challenging issue. platelet-rich plasma (prp) has been recently been used to improve healing of cartilage defects. in the present experiment, we aimed to investigate the effects of prp on regeneration capacity as well as survival of the cartilage grafts in a rabbit model. meth...

Addition of methyl lithium to d-erythrono-1,4-lactone followed by acid deprotection was shown, by X-ray crystallography, to give 1-de-oxy-d-arabinitol, C(5)H(12)O(4), rather than 1-de-oxy-d-ribitol as the major product. The crystal structure exists as hydrogen-bonded chains of mol-ecules running parallel to the c axis which are further linked together by hydrogen bonds. Each mol-ecule is a dono...