Genetic Diversity of Stenotrophomonas maltophilia Isolated from Clinical Specimens

Stenotrophomonas maltophilia is a multi-drug resistant pathogen that has been isolated with increasing frequency from the hospitalized patients. A total of 202 S. maltophilia was isolated from three university hospitals and analysed by molecular typing for an epidemiologic investigation. All isolates were tested by antimicrobial susceptibility, random amplified polymorphic DNA (RAPD) analysis, and pulsed-field gel electrophoresis (PFGE). The RAPD and PFGE patterns were recorded and analysed by the unweighted-pair group method with arithmetic average method. Two or more isolates were considered to be clonally related if their PFGE pattern exhibited > or =80% similarity. Trimethoprim/ sulfamethoxazole and ciprofloxacin were the most active antimicrobial agents tested. The majority of the isolates found to be genetically unrelated by PFGE. The genetically related isolates were recovered from the same patient. The result demonstrates a high genetic diversity of S. maltophilia isolates from clinical specimens. The clonal diversity of S. maltophilia from the hospitalized patients is partly due to the strains originated from the hospital environments, but not horizontal transfer between the patients

Screening for Antifungal Endophytic Fungi Against Six Plant Pathogenic Fungi

A total of 187 endophytic fungi were isolated from 11 plant species, which were collected from 11 locations in Korea. Their antifungal activities were screened in vivo by antifungal bioassays after they were cultured in potato dextrose broth and rice solid media. Antifungal activity against plant pathogenic fungi such as Magnaporthe grisea (rice blast), Corticium sasaki (rice sheath blight), Botrytis cinerea (tomato gray mold), Phytophthora infestans (tomato late blight), Puccinia recondita (wheat leaf rust), and Blumeria graminis f. sp. hordei (barley powdery mildew) was determined in vivo by observing the inhibition of plant disease development. Twenty (11.7%) endophytic fungi fermentation broths were able to control, by more than 90%, at least one of the six plant diseases tested. Among 187 liquid broths, the F0010 strain isolated from Abies holophylla had the most potent disease control activity; it showed control values of more than 90% against five plant diseases, except for tomato late blight. On the other hand, fourteen (7.5%) solid culture extracts exhibited potent disease control values of more than 90% against one of six plant diseases. The screening results of this study strongly suggested that metabolites of plant endophytic fungi could be good potential sources for screening programs of bioactive natural products.

Antimicrobial resistance and molecular epidemiologic characteristics of Stenotrophomonas maltophilia isolated from clinical specimens

Sixty-eight clinical isolates of Stenotrophomonas maltophilia from inpatients of 2 university hospitals in Taegu were epidemiologically analyzed by using the minimum inhibitory concentrations of 25 antimicrobial drugs, biochemical reaction, pulsed-field gel elctropgoresis (PFGE), and PCR with enterobacterial repetitive intergenic consensus sequences as primer (ERIC-PCR). 1. All the strains were susceptible to minocycline. More than 57% were susceptible to sulfisomidine (Su), ciprofloxacin (Ci), Ofloploxacin (Of), nalidixic acid (Na), and chloramphenicol (Cm), and 19apprx35% to ceftazidime (Cd), trimethoprim (Tp), Ticacillin-clavulanic acid, and cefoperazone-sulbactam. Most isolates were resistant to beta-lactam antibiotics such as ampicillin (Ap), carbenicillin (Cb), cefotaxim (Ct), cefoxitin (Cx), and aminoglycosides including gentamicin (Gm), tobramycin (Tb), amikacin (Ak). 2. All the isolates were multiply resistant of 5 to 17 drugs and showed 40 different resistance pattern types. 3. All the strains showed very similar biochemical reactions except beta-galactosidase and nitrate reduction test. Fourteen strains selected randomly were classified 10 different pattern type by PFGE and ERIC-PCR. These two methods showed identical result. Four strains isolated from wound in 1994 showed similar MIC pattern and identical API 20NE profile, PFGE, and ERIC-PCR pattern indicating episodes of cross-infection among patients. These results indicate that PFGE or ERIC-PCR profile has comparable discriminatory power for epidemiological typing of S. maltophilia.

COMPARATIVE ANALYSIS BETWEEN LEVATOR RESECTION AND METHODS USING FRONTALIS ACTION 2-4mm OF LEVATOR FUNCTION IN BLEPHAROPTOSIS PATIENTS

The choice of operative procedures was determined by many factors, but the levator function is considered as the most important factor. Fox recommended that when the levator function was 2 to 9 mm, the patient should be treated by the levator resection and when the levator function was below 2 mm, the patient should be crated by frontalis suspension. But Collin recommended that when the levator function was below 4 mm, the brow suspension procedure got the better result. Beside that, many other authors recommended various opinions. Therefore, when levator function of the patients was between 2 and 4 mm, the choice of operative procedure was much confusing us. The aim of this study is to clarify which is better Procedures between levator resection and the frontalis transfer or orbicularis oculi muscle transfer among the patients with 2 to 4 mm of levator action. From Jan. of 1991 to Dec. of 1994, among 26 patients with 2 to 4 mm levator function, 13 cases of 10 patients were operated by levator resection, 21 cases of 16 patients were teated by frontalis transfer or orbicularis oculi muscle flap. The results were evaluated with the average 27 months of follow-up and we compared the result of the levator resection procedure with that of frontalis muscle transfer or orbicularis oculi muscle transfer. The preoperative average amount of ptosis is about 2.7 mm in cases with levator resection, about 4.0 mm in cases with frontalis muscle transfer or orbicularis oculi muscle flap transfer. The postoperative average amount of ptosis is about 1.7 mm in cases with levator resection about 2.14 mm in cases with frontail muscle transfer or orbicularis oculi muscle flap transfer and so the postoperative improvement of amount of ptosis is about 1.0 mm in cases with levator resection, about 1.86 mm in cases with frontails muscle transfer or orbicularis oculi muscle flap transfer. The major complication of levator resection method is undercorrection. However, the eyelid deformity due to excessive upward traction was more frequent in frontalis muscle flap technique.

THE SELECTIVE USING OF MUSCLE FLAPS AROUND EYE FOR THE CORRECTION OF BLEPHAROPTOSIS AND ITS COMPLICATIONS

Eighty-three cases with severe blepharoptosis were treated by the superiorly based muscle flaps around eye including orbicularis oculi muscle, frontalis muscle, levator muscle. The selection of the muscle flaps were done in accordance with the levator function of patients. The orbicularis oculi muscle flap technique in 32 patients who have 2-5 mm levator function, 21 cases of the interdigitated orbicularis oculi-frontalis muscle flap for 1-3 mm levator function, frontalis muscle flap technique for less than 2 mm levator function, 22 cases of levator muscle resection for 2-8 mm levator function, 7 cases of levator plication for 5-9 mm levator function. The majority of patients recorded as satisfactory results. There has been no complete failure but there were 14 cases of undercorrection, 4 cases of overcorrection, 2 cases of exposure keratitis, 3 cases of corneal erosion, 2 cases of sensory loss, hematoma loss of wrinkle and a few cases of eyelid deformity such as notching, entropion, fading or unnatural fold. The orbicularis oculi muscle technique or the interdigitated orbicularis oculi-frontalis muscle flap technique offers several advantages over conventional frontalis muscle flap technique such as being a simple with a good operative field, single incision or supratarsal fold, no depression on the forehead, no risk of neurovascular injury and relatively easy technique with less complication. The levator resection or levator plication could offer good results by careful selection of patients. In conclusion, we would like to say that the interdigitated frontalis orbicularis oculi muscle flap technique is best in cases with less than 2 mm levator function, orbicularis oculi muscle flap technique in 2-4 mm levator function, levator resection in 4-8 mm levator function, levator plication in more that 8 mm levator function.

A CASE OF TONGUE RESECTION IN MACROGLOSSIA AS A PRESENTATION OF BECKWITH-WIEDEMANN SYNDROME

The Beckwith-Wiedemann syndrome, originally described by Beckwith in 1963 and Wiedemann in 1964, included congenital anomalies such as macroglossia, exomphalos, postnatal somatic gigantism, severe hypoglycemia, abdominal wall defect, capillary nevus flameus and hemihypertrophy. Macroglossia is the most common manifestation of Beckwith-Wiedemann syndrome, with studies reporting between 82 and 95 percent of the cases. Macroglossia may cause the upper airway obstruction, deglutition difficulty, articulation interference and protrusion of dentoalveloar structures resulting in anterior open bite and a mandibular prognathism. We experienced a 5 month-old male with upper airway obstruction, deglutition difficulty and recurrent upper airway infection due to macroglossia associated with Beckwith-Wiedemann syndrome and significant improvement in respiration, feeding and oral competence at 14 months follow-up after rhomboid resection and primary closure of tongue.

THREE DIMENSIONAL FINITE ELEMENT ANALYSIS ON THE MINMUM CONTACT FRACTION OF BONE-IMPLANT INTERFACE / 대한치과보철학회지

In order to find the degree of osseointegration at bone-implant interface of clinically successful implants, models including the 3.75mm wide, 10mm long screw type Branemarkimplant as a standard and cylinder, 15mm long, 5.0mm wide, two splinted implants, and implants installed in various cancellous bone density were designed. Also, the amount of load and material of prostheses were changed. The stress and minimum contact fraction were analyzed on each model using three-dimensional finite element method(I-DEAS and ABAQUS version 5.5) The results of this study were as follows. 1. 10mm long, 3.75mm diameter-screw type implant had 36.5~43.7% of minimum contact fraction. 2. Cylinder type implant showed inferior stress distribution and higher minimum contact fraction than screw type. 3. As implant length was increased, minimum contact fraction was increased a little, however, maximum principal stress was decreased. 4. Implants with a large diameter had lower stress value with slightly higher minimum contact fraction than standard screw type. 5. Two splinted implants showed no change of minimum contact fraction. 6. The higher bone density, the lower stress value. 7. The material of occlusal surface had no effect on the stress of the bone-implant interface.

A study on oral sensory function in the implant-supported prosthesis wearers / 대한치과보철학회지

No abstract available.