Aims: Pseudomonas putida CP1 exhibits substrate-dependent autoaggregation during the degradation of 100 ppm 2- chlorophenol, 100 ppm 3-chlorophenol and 200 ppm 4-chlorophenol. This study discussed the production of extracellular polymeric substances (EPS) by the organism for the formation of aggregates. Methodology and results: Aggregation was accompanied by the production of extracellular polymeric substances (EPS). The extent of EPS production and the size of the aggregates increased with increasing stress as did the aggregation index and the hydrophobicity of the cells. A biochemical analysis of the EPS showed that the main constituents were carbohydrate (40% w/v) and protein (50% w/v) together with lower levels of DNA (<10% w/v). Conclusion, significance and impact study: Given that the aggregated form of the bacterium has shown potential for use in bioaugmentation, an in-depth understanding of the phenomenon could enhance the use of this organism in biological wastewater treatment systems.
Pseudomonas putida

BACKGROUND/AIMS: Since endoscopes are reusable apparatus classified as semicritical item, thorough reprocessing to achieve high-level disinfection is of utmost importance to prevent spread of infection. To improve disinfection efficacy and safety, disinfectants and endoscope reprocessors are continuously evolving. This study aimed to compare the efficacy of the combination of polyhexamethylenebiguanide hydrochloride-alkyldimethylbenzylammonium chloride (PHMB-DBAC) and orthophthalaldehyde (OPA) used respectively in ultrasonographic cleaning incorporated automated endoscope reprocessors: COOLENDO (APEX Korea) or OER-A (Olympus Optical). METHODS: A total of 86 flexible upper endoscopes were randomly reprocessed with either COOLENDO/PHMB-DBAC or OER-A/OPA. Culture samplings were done at two sites (endoscope tip and working channel) which were later incubated on blood agar plate. Bacterial colonies were counted and identified. RESULTS: The culture-positive rate at the endoscope tip and working channel was 0% and 2.33% for COOLENDO/PHMB-DBAC and 4.65% and 0% for OER-A/OPA. Staphylococcus hominis was cultured from one endoscope reprocessed with COOLENDO/PHMB-DBAC and Pseudomonas putida was isolated from two endoscopes reprocessed with OER-A/OPA. CONCLUSIONS: The reprocessing efficacy of COOLENDO/PHMB-DBAC was non-inferior to that of OER-A/OPA (p=0.032; confidence interval, -0.042 to 0.042). During the study period, significant side effect of PHMB-DBAC was not observed.
Agar ; Disinfectants ; Disinfection ; Endoscopes ; Pseudomonas putida ; Staphylococcus hominis

Iran bears a remarkable variety of reptiles. One of the lizard families occurring in Iran is the Family Agamidae which is widely are distributed throughout the old world. The large-scaled rock agamid, Laudakia nupta, is one of the well-known agamid. There are few reports of cloacal microbial on reptiles hence their function in cloacae remains unknown. Laudakia nupta usually live in rural and urban areas and close vicinity to man, they are likely to play an important role in the spread of disease that may be caused by these microorganisms and their transmission to man. Therefore, the aim of this study was to identify the bacterial flora colonizing the cloacal region of Laudakia nupta using molecular studies. The cloacal fluids were directly placed on nutrient agar (NA) plates and incubated at 25 ± 2 ℃ for 48 h. The resulting bacterial colonies were transferred to fresh nutrient agar (NA) plates for molecular studies. Twelve isolates were obtained from 17 specimens of Laudakia nupta. All bacteria isolates were identified as Bacillus subtillis (5), Bacillus cereus (4), Bacillus sp. (1), Pseudomonas putida (1), and Pseudomonas sp. (1) based on partial sequences of the 16 s rRNA gene. This is the first comprehensive report of bacteria spp. associated with cloaca of Laudakia nupta using molecular studies. In this research, we found that Laudakia nupta can be a carrier of bacteria which can transfer microorganisms to hosts.
Agar ; Bacillus ; Bacillus cereus ; Bacteria ; Cloaca ; Colon ; Genes, rRNA ; Humans ; Iran ; Lizards ; Pseudomonas ; Pseudomonas putida ; Reptiles

Infection structures were observed at the penetration sites on the leaves of cucumber plants inoculated with Colletotrichum orbiculare using a fluorescence microscope. The cucumber plants were previously drenched with suspension of bacterial strains Pseudomonas putida or Micrococcus luteus. The plants pre-inoculated with both bacterial strains were resistant against anthracnose after inoculation with C. orbiculare. To investigate the resistance mechanism by both bacterial strains, the surface of infected leaves was observed at the different time after challenge inoculation. At 3 days after inoculation there were no differences in the germination and appressorium formation of conidia of C. orbiculare as well as in the callose formation of the plants between both bacteria pre-inoculated and non-treated. At 5 days, the germination and appressorium formation of the fungal conidia were, however, significantly decreased on the leaves of plants pre-inoculated with M. luteus at the concentration with 1.0 x 10(7) cfu/ml. Furthermore, callose formation of plants cells at the penetration sites was apparently increased. In contrast, there were no defense reactions of the plants at the concentration with 1.0 x 10(6) cfu/ml of M. luteus. Similarly, inoculation P. putida caused no plant resistance at the low concentration, whereas increase of callose formation was observed at the higher concentration. The results of this study suggest that the resistant mechanisms might be differently expressed by the concentration of pre-treatment with bacterial suspension.
Bacteria ; Colletotrichum* ; Fluorescence ; Germination ; Micrococcus luteus* ; Micrococcus* ; Plants ; Pseudomonas putida* ; Pseudomonas* ; Spores, Fungal

Efficacy of resistance induction by the bacterial isolates Pseudomonas putida (TRL2-3), Micrococcus luteus (TRK2-2) and Flexibacteraceae bacterium (MRL412), which were isolated from the rhizosphere of plants growing in Jeju Mountain, were tested in a greenhouse. The disease severity caused by Phytophthora infestans was effectively reduced in the potato plants pre-inoculated with bacterial isolates compared with those of the untreated control plants growing in a greenhouse. In order to estimate the level of protection by the bacterial isolates, Mancozeb WP (Diesen M(R), Kyong nong) and DL-3-amino butyric acid (BABA) were pre-treated, whereas Dimethomorph WP (Forum(R), Kyong nong) and phosphonic acid (H3PO3) were post-treated the challenge inoculation with the pathogen. Disease severities of chemical pre-treated as well as post-treated plants were reduced compare to those of the untreated. The disease reduction in the plants pre-treated with Mancozeb WP was the highest, whereas that of post-treated with Dimethomorph WP was the lowest. The yields of plants pre-inoculated with three bacterial isolates were greatly increased than those of control plants. These results suggest that biological control by bacterial isolates might be an alternative strategy against late blight disease in potato plants growing in greenhouse.
Butyric Acid ; Cytophagaceae ; Micrococcus luteus ; Phytophthora infestans* ; Phytophthora* ; Pseudomonas putida ; Rhizosphere ; Solanum tuberosum*

OBJECTIVES: The study aimed to determine the frequency and clinical profile of nosocomial infections among pediatric patients with Acute Lymphoblastic Leukemia (ALL) admitted at the Philippine General Hospital from January 2010 to December 2011.
METHODOLOGY: This is a descriptive cross sectional study involving the review of medical records of pediatric patients with ALL under the charity service of the Section of Pediatric Hematology and Oncology of Philippine General Hospital (PGH). The frequency, clinical presentation, outcome, causes of death and isolated organisms from sterile sites were determined. Fischer's Exact test was used to assess correlation between variables with Gram-negative bacterial infection and mortality.
RESULTS: There were 80 documented nosocomial infections among 45 pediatric patients with ALL. The incidence was 9.22 per 100 admissions. The majority presented initially with fever (50%) and 37 (82%) had neutropenia. Blood stream infections were present in 33 (73%) out of 45 pediatric ALL patients. Gram-negative organisms (76%), particularly Pseudomonas putida (33%), Pseudomonas aeruginosa (12%) and Burkholderia pseudomallei (12%) were isolated in majority of patients. About 42.2% of the 45 patients had resolution of the infection and 26.7% resulted to death primarily caused by septic shock in 7 (58.3%) of the 12 patients identified. Presence of fever (p- value 0.011, RR 2.1094) was associated with presence of Gram-negative bacteria at 5% level of significance and with 2.109 times more risk to having a gram-negative infection. There was no significant correlation between mortality and symptoms of infection.
CONCLUSION: Nosocomial infections remain to be significant cause of morbidity and death among pediatric patients with ALL. Gram negative infections were the most common cause of sepsis in these patients. One fourth of the patients with nosocomial infections died.

Human ; Male ; Female ; Adolescent ; Child ; Child Preschool ; Infant ; Shock, Septic ; Pseudomonas Aeruginosa ; Pseudomonas Putida ; Sepsis ; Fever ; Medical Records ; Precursor Cell Lymphoblastic Leukemia-lymphoma

INTRODUCTION: Healthcare associated infections (HAIs) continue to be a major public health concern throughout the world particularly in developing countries wherein prevalence rates range from 5.7%-19.1%.

OBJECTIVES: The aims of this study were to determine the prevalence of HAIs among pediatric patients admitted at Philippine General Hospital and to describe the trends of annual prevalence of HAIs in relation to infection control programs implemented.

METHODOLOGY: A retrospective study was conducted at the 145-bed capacity wards and intensive care units of the Department of Pediatrics, Philippine General Hospital (PGH) from January 2011 to December 2014 wherein HAI records from the database of the Section of Infectious and Tropical Disease in Pediatrics (INTROP) were reviewed. The following data were collected and encoded: (1) number of patients admitted in the different areas: Pediatric wards (Ward 9 and Ward 11), PICU and NICU; (2) number of patients who developed HAIs; and (3) microbial isolates, sites and antibiotic susceptibility results. Trends of yearly prevalence of HAIs in relation to infection programs implemented were determined, and the microbial isolates and their antibiotic sensitivity patterns were described.

RESULTS: Among 30,032 pediatric patients at risk for HAIs and admitted from January 2011 to December 2014, the prevalence of HAI was 11.37%. There was a decreasing trend in the yearly HAI rates from 2011 to 2014 which coincided with implementation of infection control programs and hiring of a part-time infection control nurse in 2012. The prevalence of HAIs was highest at the PICU (15.17%- 27.81%) followed by the two Pediatric wards, ward 9 (9.03%-19.87%) and ward 11(8.75%-14.76%) and lowest at the NICU (7.52%-9.44%). Top isolates were Pseudomonas putida, Pseudomonas aeruginosa, and Klebsiella pneumonia. Pseudomonas organisms were still sensitive to Ceftazidime, and Klebsiella to Meropenem.

CONCLUSION: The overall HAI prevalence during the 4-year study period was 11.37% (9.14% - 13.65%) comparable to those seen in developing countries. There was a decreasing trend of prevalence annually that coincided with the implementation of various infection control programs and the hiring of a part-time infection control nurse. The microbial isolates obtained vary per area but overall the same organisms were isolated during the study periods which were susceptible to the empiric treatment given.

Human ; Male ; Female ; Cross Infection ; Ceftazidime ; Pseudomonas Aeruginosa ; Meropenem ; Anti-bacterial Agents ; Pseudomonas Putida ; Klebsiella ; Intensive Care Units, Neonatal ; Infection Control ; Thienamycins

Previously, Pseudomonas putida was considered a low-virulence pathogen and was recognized as a rare cause of bacteremia. Recently, however, multidrug-resistant and carbapenem-resistant P. putida isolates have emerged, causing difficult-to-treat nosocomial infections in seriously ill patients. Currently, the outcome of multidrug-resistant or carbapenem-resistant P. putida bacteremia remains uncertain. Here, we report 18 cases of P. putida bacteremia with high rates of carbapenem resistance and mortality. From January 2005 through December 2011, all cases of nosocomial P. putida bacteremia were identified and analyzed at Chonnam National University Hospital and Chonnam National University Hwasun Hospital. Electronic medical records were reviewed retrospectively. Four (22%) and five (23%) of 18 P. putida isolates were resistant to imipenem and meropenem, respectively. Common primary infection sites were central venous catheter (7, 39%), pneumonia (5, 28%), and cholangitis (2, 11%). Fourteen (78%) patients had indwelling devices related to the primary site of infection. The 30-day mortality rate was 39% (7/18): 40% (2/5) in patients with carbapenem-resistant P. putida bacteremia vs. 38% (5/13) in patients with carbapenem-susceptible P. putida bacteremia. Nosocomial P. putida bacteremia showed high resistance rates to most potent beta-lactams and carbapenems and was associated with high mortality rates.
Bacteremia ; beta-Lactams ; Carbapenems ; Central Venous Catheters ; Cholangitis ; Cross Infection ; Drug Resistance ; Electronic Health Records ; Humans ; Imipenem ; Pneumonia ; Pseudomonas ; Pseudomonas putida ; Retrospective Studies ; Thienamycins

Microbial nitrilases have attracted increasing attention in nitrile hydrolysis for carboxylic acid production in recent years. A bacterium with nitrilase activity was isolated and identified as Pseudomonas putida CGMCC3830 based on its morphology, physiological and biochemical characteristics, as well as 16S rRNA gene sequence. The nitrilase production was optimized by varying culture conditions using the one-factor-at-a-time method and response surface methodology. Glycerol 13.54 g/L, tryptone 11.59 g/L, yeast extract 5.21 g/L, KH2PO4 1 g/L, NaCl 1 g/L, urea 1 g/L, initial pH 6.0 and culture temperature 30 degrees C were proved to be the optimal culture conditions. It resulted in the maximal nitrilase production of 36.12 U/mL from 2.02 U/mL. Investigations on substrate specificity demonstrate P. putida nitrilase preferentially hydrolyze aromatic nitriles. When applied in nicotinic acid synthesis, 2 mg/mL P. putida cells completely hydrolyzed 20.8 g/L 3-cyanopyridine into nicotinic acid in 90 min. The results indicated P. putida CGMCC3830 displayed potential for industrial production of nicotinic acid.
Aminohydrolases ; biosynthesis ; Culture Media ; Hydrolysis ; Niacin ; biosynthesis ; Nitriles ; metabolism ; Pseudomonas putida ; enzymology ; Pyridines ; metabolism ; RNA, Ribosomal, 16S ; genetics ; Substrate Specificity ; Temperature

BACKGROUND: Nosocomial urinary tract infection (UTI) is the most frequent nosocomial infection and could be prevented through the intensive nosocomial infection control (NIC) or restricting the use of indwelling urinary catheter. The efficiency of the intensive NIC to prevent UTI for the patients with indwelling urinary catheter was investigated. METHODS: Study population consisted of 296 patients with indwelling urinary catheter in the intensive care unit (lCU) who didn't have UTI on admission. The incidence rates of nosocomial UTI were compared between 146 patients being provided with ordinary NIC from March 15 to July 31, 1995 (control group) and 150 patients being provided with intensive NIC from January 16 to October 31, 1996 (NIC group). RESULTS: There was significant decrease in the incidence of nosocomial UTI in the NIC group (35 UTI among 150 patients, 23.8%) than in me control group (68 UTI among 146 patients, 46.6%) (P<0.01). But there were no differences in age distribution, sex, admission route to the ICU and underlying diagnoses between two groups. Interval between insertion of urinary catheter and development of UTI was significantly prolonged in the NIC group (10.0 +/- 3.5 days) than in the control group(7.6 +/- 3.9 days) (p < 0.01) despite there were no differences in the duration of urinary catheterization in two groups. The most common organism isolated from the urine of the patients was Candida tropicalis in both groups and the other organisms were in the order of Enterococcus faecium, Pseudomonas putida, Staphylococcus epidermidis in the control group and in the order of Staphylococcus aureus, Acinetobacter baumannii, Enterococcus faecalis in the NIC group. Four of five Staphylococcus aureus isolated in NIC group were MRSA. CONCLUSION: This study result confirms the efficiency of intensive NIC fur decrease in the incidence of nosocomial UTI in patients with indwelling urinary catheter. But the incidence of nosocomial UTI should be decreased further through the continuous emphasis on NIC and it seems to be necessary to study the effect of each component of NIC with proper control of the risk factors for the development of nosocomial UTI in the future.
Acinetobacter baumannii ; Age Distribution ; Candida tropicalis ; Cross Infection* ; Diagnosis ; Enterococcus faecalis ; Enterococcus faecium ; Humans ; Incidence ; Intensive Care Units* ; Critical Care* ; Methicillin-Resistant Staphylococcus aureus ; Pseudomonas putida ; Risk Factors ; Staphylococcus aureus ; Staphylococcus epidermidis ; Urinary Catheterization ; Urinary Catheters ; Urinary Tract Infections* ; Urinary Tract*