This article examines the extent to which indicators of the college-going climate of urban high schools are associated with students’ application to, enrollment in, and choice among four-year colleges. The investigators examine two mechanisms by which high schools may shape college enrollment among low-income students in an urban school system: (1) by ensuring whether seniors who aspire to a fo...

Effects of Nigella sativa Allelochemical Substances on Growth-Inhibiting Flixweed Compared With Wheat (Triticum aestivum)

The plant of Convolvulus pluricaulis Choisy was found to be used by different traditional systems and folklore for the treatment of various disorders. The aim of the present study was to investigate the neuropharmacological activity of various extracts of Convolvulus pluricaulis Choisy in albino mice. The animal behavior was evaluated by locomotor activity, tremors activity, sleep inducing mode...

ANTONIS MARKOGIANNAKIS, PANAYOTIS T. TASSIOS, MARIA LAMBIRI, LINDA R. WARD, JENNY KOUREA-KREMASTINOU, NICHOLAS J. LEGAKIS, THE GREEK NONTYPHOIDAL SALMONELLA STUDY GROUP,† AND ALKIVIADIS C. VATOPOULOS* Department of Microbiology and Department of Hygiene and Epidemiology, Medical School, University of Athens, and National Reference Centre for Salmonella and Shigella, National School of Public He...

Biotypes of the broad-leaved wild mustard (Sinapis arvensis L.) found in wheat fields of Aegean and Marmara region of Turkey were characterized and shown to have developed resistance to sulfonylurea (chlorsulfuron), an inhibitor of acetolactate synthase (ALS). DNA sequence analysis of the ALS genes from two such resistant ("R") biotypes, KNF-R1 and KNF-R2, revealed point mutations, CCT (Pro 197...

Most studies on plant defenses against insect herbivores investigate direct and indirect plant defenses independently. However, these defenses are not necessarily mutually exclusive. Plant metabolites can be transmitted through the food chain and can also affect the herbivore’s natural enemies. A conflict may arise when a natural enemy is attracted to a plant that is suboptimal in terms of its ...

In this review, we summarized published reports that investigated the role of Nigella sativa (NS) and its active constituent, thymoquinone (TQ) in oral health and disease management. The literature studies were preliminary and scanty, but the results revealed that black seed plants have a potential therapeutic effect for oral and dental diseases. Such results are encouraging for the incorporati...

BACKGROUND AND THE PURPOSE OF THE STUDY It has been shown that Nigella sativa L. and Portulaca oleracea L. have many antioxidant components. In the present study, the cytoprotective effect of ethanolic and aqueous extracts of N.sativa and P.oleracea against hemolytic damages induced by free radical initiator, AAPH [2, 2' azobis (2- amidinopropane) hydrochloride] was evaluated. METHODS Hemolys...

Over many centuries humans have been mining the bounties of nature for discovering substances that have been used for the treatment of all human diseases; many such remedies are useful even today as modern day medicine. Emerging evidence also suggests that the search is still continuing for harnessing active compounds from nature in combating human illnesses although pharmaceutical industries a...

BACKGROUND In previous studies, the bronchodilator and antitussive effects of Nigella sativa have been demonstrated on guinea pigs. OBJECTIVES In the present study, the effect of the hydroethanolic extract of N. sativa on tracheal responsiveness in guinea pigs exposed to cigarette smoke was examined. MATERIALS AND METHODS Three groups of guinea pig models of COPD were given drinking water a...