A library of enriched marine natural product fractions was screened for their antiplasmodial activity using a SYBR green I fluorescence-based assay. Fractions derived from a sponge of the genus Spongosorites exhibited potent inhibition of Plasmodium falciparum growth. This genus of sponge has been reported to contain the nortopsentin and topsentin class of bis-indole imidazole alkaloids. This i...

PE Biosystems has developed guidelines enabling streamlined design and implementation of real-time quantitative PCR assays. The use of these guidelines makes it easy to apply either the fluorogenic 5 ́ nuclease assay or SYBR Green I double-stranded DNA binding dye chemistry to any real-time quantitative PCR system. Specific assay design and optimization guidelines minimize the time and cost of a...

background contamination of therapeutic recombinant proteins with residual host cell dna must be controlled under the regulatory standards. objectives the current study established a new rapid, sensitive real time polymerase chain reaction (pcr) approach to measure the reliably of the residual escherichia coli (e. coli) host cell genomic dna in the recombinant streptokinase and alfa interferon ...

Ex vivo antimalarial sensitivity testing in human malaria parasites has largely depended on microscopic determination of schizont maturation. While this microscopic method is sensitive, it suffers from poor precision and is laborious. The recent development of portable, low-cost cytometers has allowed us to develop and validate a simple, field-optimized protocol using SYBR green and dihydroethi...

PE Biosystems has developed guidelines enabling streamlined design and implementation of real-time quantitative PCR assays. The use of these guidelines makes it easy to apply either the fluorogenic 5 ́ nuclease assay or SYBR Green I double-stranded DNA binding dye chemistry to any real-time quantitative PCR system. Specific assay design and optimization guidelines minimize the time and cost of a...

Background and Aims: Newcastle disease virus (NDV) is an avian paramyxovirus (A-PMV 1) and one of the major pathogens in poultries. Vaccination is intended to control the disease, nevertheless this virus is a growing threat to the poultry industry. So, early detection of the virus can prevent the spread of illness and avoid huge economic losses. Towards this goal, in this research, we develop...

Background and Aims: World Health Organization Global Polio Laboratory Network (GPLN) plays a critical role in the Global Polio Eradication Initiative. Cell culture methods (mostly RD and L20B cell lines) have been used for Enteroviruses and polioviruses isolation, respectively. Cross-contamination among L20B and RD cell lines causes the problem in accuracy of poliovirus surveillance and decrea...

We have investigated the mechanics of individual DNA strands exposed to DNA binding ligands. The interaction of these agents with individual dsDNA strands measured by optical tweezers clearly indicates the ligand-DNA binding mode. As expected, if the compound is intercalating then an increase of contour length is detected. Groove binders affect the overstretching capabilities of the formerly “n...

Flow cytometry (FCM) was successfully used to analyze freshwater bacteria and viruses in lake sediments after relatively simple sample treatment and optimization of dilution/fixation/staining procedures. Biological particles from Lakes Geneva and Bourget were first separated from the sediments by using both Sodium Pyrophosphate (0.01 M final concentration) and Polyoxyethylene-Sorbitan Monooleat...

Xylella fastidiosa (Xf) is a plant pathogenic bacterium that is transmitted between hosts by the glassy-winged sharpshooter (GWSS; Homalodisca vitripennis). Multiple subspecies of Xf occur and are host specific. Xf subsp. fastidiosa is the causal agent of Pierce’s disease (PD). Xf subsp. multiplex and Xf subsp. sandyi are commonly found in North America but do not cause PD. Rapid diagnostics to...