Research Interests:
OBJECTIVE To evaluate the sensitivity patterns of different antibiotics of pseudomonas in relation to specimen types. METHODS The quantitative retrospective study was conducted at Princess Iman Research and Laboratory Sciences Centre of... more
OBJECTIVE To evaluate the sensitivity patterns of different antibiotics of pseudomonas in relation to specimen types. METHODS The quantitative retrospective study was conducted at Princess Iman Research and Laboratory Sciences Centre of Royal Medical Services, Amman, Jordan. The specimens of USS, urine, cerebral spinal fluid, and blood were collected from patients, who visited the hospital from January to September 2015. Drugs analysed included ampicillin, ceftazidime, ciprofloxacin, cefotaxime, cefoxitin, nitrofurantoin and gentamicin. RESULTS There were 358 samples collected. Ampicillin was found effective (p=0.002). There was a weaker correlation between amikacin and amoxicillin/clavulanic acid (r=-0.001). Similarly, nitrofurantoin was also effective (p=0.001), and the association between amikacin and ceftazidime was positive (r=0.998). CONCLUSIONS The selected antibiotics were only examined, concerning the sensitivity patterns as data collected from the patients was insufficient...
Research Interests:
The review aims to examine the emergence and reemergence of infectious diseases in Jordan, in parallel with the Syrian refugee crisis. Qualitative approach has been adopted for systematically examining the outcomes of the Syrian crisis,... more
The review aims to examine the emergence and reemergence of infectious diseases in Jordan, in parallel with the Syrian refugee crisis. Qualitative approach has been adopted for systematically examining the outcomes of the Syrian crisis, which resulted in emerging and reemerging infectious diseases. It has adhered that infectious diseases, including measles, tuberculosis, and cutaneous leishmaniasis, have hazardous effects on Syrian refugees along with the local population in Jordan. The threat of major infectious diseases is higher and alarming in Jordan. National health policies should be implemented to adhere the influence of infectious diseases as well as to reduce the extent of infectious diseases in Jordan. In the 21st century, Syrian conflict can be deliberated as one of the biggest humanitarian disasters. In this multifaceted emergency with devastating requirements and limitations, it has been found essential for dominant medical healthcare providers to develop medical strate...
Research Interests:
Research Interests:
Research Interests:
Ethanolic dehydration (20% to 70%) of the thylakoid membranes of Chlorogloeopsis fritschii resulted in an 8% to 58% loss of glutamine synthetase activity. In Chlorella pyrenoidosa, hydroxypyruvate reductase and fumarase, marker enzymes of... more
Ethanolic dehydration (20% to 70%) of the thylakoid membranes of Chlorogloeopsis fritschii resulted in an 8% to 58% loss of glutamine synthetase activity. In Chlorella pyrenoidosa, hydroxypyruvate reductase and fumarase, marker enzymes of the peroxisomes and mitochondria, respectively, diffused from the organelles on dehydration.
Research Interests:
summary The relationship between inorganic-carbon dependent photosynthetic oxygen evolution and calcification was investigated in high-and low-calcifying strains of Emiliania huxleyi showing a ten-fold difference in calcification rate.... more
summary The relationship between inorganic-carbon dependent photosynthetic oxygen evolution and calcification was investigated in high-and low-calcifying strains of Emiliania huxleyi showing a ten-fold difference in calcification rate. Unlike the low-calcifying strain ...
Research Interests:
SUMMARY The relationship between calcite production and dissolved inorganic carbon (DIC) utilization was investigated using high- and low-calcifying strains of Emiliania huxleyi aerated with either air (0.03 % v/v CO2) or CO2-free air.... more
SUMMARY The relationship between calcite production and dissolved inorganic carbon (DIC) utilization was investigated using high- and low-calcifying strains of Emiliania huxleyi aerated with either air (0.03 % v/v CO2) or CO2-free air. With cultures grown on air, calcite production was eight-fold greater in the high-calcifying culture, but growth rates for high- and low-calcifying cultures were similar. Growth and calcite production were accompanied by a concomitant decrease in DIC and free CO2 in the high-calcifying culture, showing that HCO3− provides inorganic carbon for calcite synthesis. In low-calcifying cultures DIC and free CO2 were relatively constant, confirming that cells acquire inorganic carbon mainly by the diffusive entry of free CO2. When cultures were aerated with CO2-free air the free CO2 concentration was below the K0.5[CO2] for high- and low-calcifying cells and the low-calcifying cells were unable to grow. Growth of high-calcifying cells was observed, and the calcite yield was little changed from cultures gassed with air (0.03 % v/v CO2). At these minimal CO2concentrations HCO3− may provide inorganic carbon for calcite synthesis and CO2 for photosynthesis, allowing growth to occur. Calcite synthesis by E. huxleyi decreases DIC and carbonate alkalinity in cultures not in equilibrium with the gas phase.
Research Interests:
... Journal of Protozoology 23: 253-256. Delieu T, Walker DA. 1972. ... In: Biochemistry and physiology of protozoa, 2nd edn., vol. 1. Academic Press, 191-213. Lohmann H. 1908. Uber die Bezieheungen zwuschen den pelagischen Ablagerungen... more
... Journal of Protozoology 23: 253-256. Delieu T, Walker DA. 1972. ... In: Biochemistry and physiology of protozoa, 2nd edn., vol. 1. Academic Press, 191-213. Lohmann H. 1908. Uber die Bezieheungen zwuschen den pelagischen Ablagerungen und dem Plankton des Meers. ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Glycollate dehydrogenase of the halotolerant green alga Dunaliella salina, isolated from a brine pond, was found associated with the membrane fraction which exhibited complete photosynthetic activity. Highest enzyme activity was found in... more
Glycollate dehydrogenase of the halotolerant green alga Dunaliella salina, isolated from a brine pond, was found associated with the membrane fraction which exhibited complete photosynthetic activity. Highest enzyme activity was found in cells grown in the presence of 5% NaCl. Any increase in NaCl concentration led to a decrease in specific enzyme activity.
Research Interests:
Page 1. 1200 J. Phycol. 35, 12001205 (1999) INORGANIC CARBON LIMITATION, EXOFACIAL CARBONIC ANHYDRASE ACTIVITY, AND PLASMA MEMBRANE REDOX ACTIVITY IN MARINE PHYTOPLANKTON SPECIES1 Nabil A. Nimer,2 Miao Xiao Ling ...
Research Interests:
J. Phycol. 33, 625-631 (1997) BICARBONATE UTILIZATION BY MARINE PHYTOPLANKTON SPECIES Nabil A. Nimer,2 M. Debora Iglesias-Rodriguez, and MichaelJ Mmett ... The light-dependent alkalization of the external medium re-625 Page 2. 626 NABIL... more
J. Phycol. 33, 625-631 (1997) BICARBONATE UTILIZATION BY MARINE PHYTOPLANKTON SPECIES Nabil A. Nimer,2 M. Debora Iglesias-Rodriguez, and MichaelJ Mmett ... The light-dependent alkalization of the external medium re-625 Page 2. 626 NABIL A. NIMER ET AI.. ...
Research Interests:
Research Interests:
ABSTRACT A range of marine photosynthetic picoeukaryote phytoplankton species grown in culture were screened for the presence of extracellular carbonic anhydrase (CAext), a key enzyme in inorganic carbon acquisition under carbon- limiting... more
ABSTRACT A range of marine photosynthetic picoeukaryote phytoplankton species grown in culture were screened for the presence of extracellular carbonic anhydrase (CAext), a key enzyme in inorganic carbon acquisition under carbon- limiting conditions in some larger marine phytoplankton species. Of the species tested, extracellular carbonic anhydrase was detected only in Micromonas pusilla Butcher. The rapid, light-dependent development of CAext when cells were transferred from carbon-replete to carbon-limiting conditions was regulated by the available free- CO2 concentration and not by total dissolved inorganic carbon. Kinetic studies provided support for a CO2- concentrating mechanism in that the K0.5[CO2] (i.e. the CO2 concentration required for the half-maximal rate of photosynthesis) was substantially lower than the Km[CO2] of Rubisco from related taxa, whilst the intracellular carbon pool was at least seven fold greater than the extracellular DIC concentration, for extracellular DIC values 1.0 mm. It is proposed that when the flux of CO2 into the cell is insufficient to support the photosynthetic rate at an optimum photon irradiance, the development of CAext increases the availability of CO2 at the plasma membrane. This ensures rapid acclimation to environmental change and provides an explanation for the central role of M. pusilla as a carbon sink in oligotrophic environments.
Research Interests:
HCO3− utilization by the marine microalga Nannochloropsis oculata was investigated using a pH drift technique in a closed system. Light-dependent alkalization of the medium resulted in a final pH of 10.5, confirming substantial HCO3− use... more
HCO3− utilization by the marine microalga Nannochloropsis oculata was investigated using a pH drift technique in a closed system. Light-dependent alkalization of the medium resulted in a final pH of 10.5, confirming substantial HCO3− use by this alga. Alkalinity remained constant throughout the pH drift. Measurement of dissolved inorganic carbon (DIC) or the uptake of H14CO3− showed that nearly 50% of the total DIC remained external to the plasma membrane on completion of a pH drift. The rate of light-driven alkalization was inhibited by 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) and thus was dependent on photosynthesis. Light-driven alkalization was not inhibited by a membrane-impermeable inhibitor of carbonic anhydrase (CA), dcxtran-bound sulphonamide (DBS), indicating that external CA was not involved in HCO3− utilization. The anion-cxchangc inhibitor 4′,4′-diisothiocyanostilbene-2,2-disulphonic acid (DIDS) completely inhibited light-driven alkalization of the medium and H14CO3− uptake, providing unequivocal support for a direct uptake of H14CO3−. Chloride ions were essential for DIC-dependent photosynthetic oxygen evolution, suggesting that bicarbonate transport occurs by HCO3−/CI− exchange.