The synthesis of a cyclic heptapeptide, delavayin-C, cyclo(gly-tyr-tyr-tyr-pro-val-pro) is described. The structure of this compound was established on the basis of analytical IR, (1)H NMR and FAB mass spectral data. The antibacterial and antifungal activities of this peptide are also described.

BACKGROUND Leukocyte telomere length (LTL) is considered a biomarker of human aging and based on cross-sectional studies it shortens with age. However, longitudinal studies reported that many adults display LTL lengthening. METHODS Using Southern blots, we compared cross-sectional rates of age-related LTL change across a ∼20 year age range with those based on longitudinal evaluations in three...

The cell is a highly ordered and intricate machine within which a wide variety of chemical processes take place. The full scientific understanding of cellular physiology requires accurate mathematical models that depict the temporal dynamics of these chemical processes. Modelers build mathematical models of chemical processes primarily from systems of differential equations. Although developing...

The practice of the physician has changed greatly in the last 100 years. Yet, the fundamental role remains constant: it is the physician's function to make a diagnosis, assess prognosis, choose and deliver the most effective treatment and then to assess the adequacy of that treatment (both in terms of effectiveness and safety). Whereas our predecessors were almost entirely reliant on clinical h...

Two sections of Genetics and Evolution were taught by one instructor. One group (the fully flipped section) had the entire class period devoted to active learning (with background material that had to be watched before class), and the other group (the partially flipped section) had just a portion of class time spent on active learning (with the background material presented during class time). ...

the synthesis of 4-(substituted benzylidene)-2-(pyrazin-2-yl) oxazol-5(4h)-one was achieved in two steps, in first step, pyrazine-2-carboxamide  dissolved in etoh, 10% koh solution with clch2cooh produced compound 2-(pyrazine-2-carboxamido) acetic acid (ii) and in second step, compound (ii) in (ch3co)2o with aromatic aldehyde, and catalyst potassium acetate produced title compounds 4-(substitut...

A second National Science Foundation-sponsored workshop on Conceptual Assessment in Biology was held in January 2008. Reports prepared for the workshop revealed that research groups working in a variety of biological sciences are continuing to develop conceptual assessment instruments for use in the classroom. Discussions at this meeting largely focused on two issues: 1) the utility of the back...

Biodegradability , are known as biological degradation degree of biodegradable organic pollutants by microorganisms. Organic biodegradability can be divided into aerobic biodegradability and anaerobic biodegradability. At present, evaluation methods for biological degradation degree include aerobic biodegradability method of relative oxygen consumption or rate method, integrated test evaluation...