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Synthesis of D-Galactose-Modified 1,3- Dithiole-2-Thione Derivative

Abstract

The chemistry of tetrathiafulvalene (TTF) derivatives has been extensively investigated in recent years because of their ability to form charge transfer compounds and their potential as conductors and superconductors. However, careful literature search showed that nothing is mentioned about TTF or any of its derivatives bonded to sugar. Such compounds may prove interesting from the point of view of molecular electronics and biosensors. In this paper, we report the successful synthesis of the first dithiolate-sugar derivative, a precursor to TTF-sugar.

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Light & Shadow at the DLSU: Not a problem at all for the quantum yield of photosystem II (Y) of plants growing on the campus: But how to determine Y experimentally?

Abstract

This science education report introduces the technique of pulse amplitude modulated (PAM) fluorescence measurement of chlorophyll for the sensitive, noninvasive and rapid determination of quantum yield of photosystem II (y) in both laboratory and field experiments by the application of a portable chlorophyll fluorometer, the so-called Mini-PAM.  In a case study we applied the Mini-PAM for the comparison of Y of various ferns and higher plants adapted to different light intensities on the DLSU campus. Read More

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Quasilocal Background Approach to the One-loop Effective Action

Abstract

The one-loop effective action that accommodates an arbitrary number of covariant derivatives of a strong but slowly-varying background field is presented in closed form.  The internal symmetry and spacetime dimension are kept arbitrary in the formalism.  The first few terms in the perturbative expansion of the one-loop effective action are derived and are found to agree with those obtained using popular methods. Read More

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Soil Transmitted Roundworm Infection on Grade Two Students

Abstract

Stool specimen from 239 randomly-selected Grade II students of General Tiburcio de Leon Elementary School were collected to determine the prevalence and intensity of soil-transmitted roundworm infection among these students, and to correlate this with their academic achievement. The formalin-ether concentration technique (FECT) was used to process these specimen. Ascaris and Trichuris were the predominant parasites detected. Read More