Dust accumulation due to anthropogenic impact induces anatomical and photochemical changes in leaves of Centranthus ruber growing on the slope of the Vesuvius volcano.

In Mediterranean ecosystems, some natural areas are exposed to severe anthropogenic impact. Especially in summer, the considerable number of tourists visiting such areas, often with vehicles, causes deposition of dust over the vegetation due to formation of powder clouds, also favoured by wind erosion, high temperature, low precipitation and incoherent soil structure. The main aim of this study was to analyse whether the deposition of dust can induce changes in leaf anatomical functional traits and in the efficiency of photosynthetic apparatus in Centranthus ruber, a species widespread in Mediterranean ecosystems. Leaf morpho-functional traits were quantified in plants growing at sites characterised by high (HD) and low (LD) dust deposition, in periods with high anthropogenic impact. Analyses included quantification of chlorophyll fluorescence emission parameters, photosynthetic pigment concentration as well as stomatal size and frequency, leaf lamina thickness, quantification of intercellular spaces and phenolics in the mesophyll through microscopy. The overall analysis suggested that the different conditions of dust deposition induced different adjustment of morpho-functional traits in leaves of C. ruber. High dust deposition shielded the leaf lamina, protecting the photosynthetic apparatus from excess light and favoured plant photochemical efficiency. Leaves exposed to low dust deposition showed higher accumulation of phenolic compounds, protecting chloroplast membranes and characterised by high thermal dissipation of excess light. Such adaptive phenomena can affect vegetation dynamics due to possible different species-specific plant responses, resulting in different plant competitiveness under the limiting conditions of Mediterranean environments.

Approaches to addressing occupational and environmental health needs in Mexico.

The University of California, Los Angeles, has somewhat shifted the focus of its Fogarty program, taking a four-pronged approach: conducting high-level collaborative scientific research with Mexican faculty and trainees at the most advanced institutions in the country; providing training and collaborative research opportunities to faculty/students at other institutions in Mexico (primarily through training faculty who do not hold doctoral degrees); providing environmental and occupational health training to the professional community throughout Mexico; and developing short courses on special topics that provide means for greater research collaboration and skill building. The program is also working with existing institutions to develop academic programs that will enlarge the environmental and occupational health infrastructures in Mexico and Latin America.

Palpitations and fatigue in a football player.

An 18-year-old college football linebacker reported to the training room physician's office in early September complaining of an irregular heartbeat and lightheadedness while weightlifting. He also noted mild fever and chills and rapid fatigability during practice. He said that he had had a skin eruption several weeks earlier. He denied chest pain or pressure, near syncope or syncope, shortness of breath, or history of palpitations.

Weight control practices of lightweight football players.

The objective of this research was to investigate the weight control practices of lightweight football players. In addition, the importance of several variables was examined for their clinical importance and ability to identify individuals at high risk for pathogenic eating behaviors. Male college lightweight football players (N = 131) were administered a 45-item version of the Diagnostic Survey For Eating Disorders (9). Results revealed that 74% had experienced binge eating, and 17% had experienced self-induced vomiting. During the month preceding questionnaire administration, 66% had fasted, nearly 4% had used laxatives, while less than 2.5% had used diet pills, diuretics, or enemas for the purpose of weight control. Furthermore, the "teacher/coach" seemed to be the individual who motivated dieting behavior, and more than 20% of the sample reported that their weight control practices interfered with their thoughts and extracurricular activities "often" or "always." Most importantly, 42% of the sample evidenced a pattern of dysfunctional eating, while 9.9% of the sample engaged in binge-purge behavior to the degree that it might represent an eating disorder. Finally, discriminant the degree that it might represent an eating disorder. Finally, discriminant analysis yielded several variables that might be useful in identifying individuals at risk for pathogenic eating behaviors.

A reciprocating, single-needle hemodialyzer with bidirectional flow of sorbent suspension.

Previous theoretical analysis has indicated that adequate mass transfer is possible in a dialyzer with reciprocating membrane motion provided that the dialysate concentration of uremic substances is kept low. Earlier models have utilized a collection of sorbents (charcoal, urease, and a cation exchanger) constrained next to the dialyzer membranes. We have designed a new dialyzer with a sorbent suspension having free access from a reservoir to the spaces between membrane packages. At a treatment rate of 150 ml/min/m2, the in vitro creatinine clearance is 75 ml/min/m2, which agrees within experimental accuracy with the theoretical prediction. The creatinine clearance, flow resistance, and compliance of the dialyzer are constant during four to six hours of testing. In vivo tests have been performed during urea and creatinine infusion in a normal dog and in a dog with 3/4 nephrectomy. The in vivo creatinine clearance agrees within 10% with the in vitro clearance. Sodium, potassium, calcium, and bicarbonate fluxes are acceptable for patients in renal failure. The new design allows a higher capacity for urea and creatinine, since larger amounts of sorbent may be used.