Alternative and Conventional Agricultural Representations in the United States: Results from Two National Mail Surveys, 1992 and 2001

This article examines the ways in which perceptions of agriculture are represented by the American public. Presented here are descriptive and exploratory findings from two national mail surveys that asked Americans about their views of agriculture, food, and the environment. I focus specifically on views related to the structure of agriculture as well as those related to the use of technology in food production. The goals of this study are to identify which sociodemographic segments of the American public favor alternative over conventional attitudes and to determine how this has changed over time. Overall, support for both alternative structure and technology is greater than support for either conventional structure or technology in the United States, and this has remained true over the nine-year period of the investigation. However, there are segments of the population that favor conventional agriculture. Implications for future research and policies are offered

Measurement of grapevine canopy leaf area by using an ultrasonic-based method.

Aim: Measurement of leaf area in grapevine has always been a critical point in researches focused on irrigation management, training systems, source-sink interrelationships and efficiency of spray application to canopies. In this work, we propose the use of ultrasonic sensors as a fast and accurate tool for the estimation of large portions of leaf canopy area. Methods and results: Through outputs of ultrasonic sensors installed on a tractor moving along vineyard rows, we calculated an ultrasonic-based leaf density index that we correlated with three measurements or estimates of canopy area: I) direct measurement of the area of a canopy portion (LAØ), assessed by summing the areas of all the leaves, where each single-leaf area was assessed by regressing the leaf diameter (the maximum width perpendicular to the main rip) against the related leaf area calculated on the basis of a relation between the leaf diameter and the leaf area, previously assessed through an area meter on a 20-leaf sample; II) the point quadrat output (LApq); and III) the canopy leaf area index (LAI) obtained through LAI-2000 (Li-Cor) technology. The measurements were assessed on six cultivars in three replicate rows (8-12 plants per cultivar per row) in a vineyard trained to a vertical trellis system. Conclusion: When we correlated the three independent control parameters with each other, we obtained highly significant correlations between LApq and LAØ, but less significant correlations between these two and LAI-2000 outputs. Also, the correlations between ultrasonic outputsoutputs and LAØ and LApq were significant, with R2 ranging between 0.84 and 0.85. On the contrary, no significant correlation was found between ultrasonic outputs and LAI-2000 outputs. These results were obtained by averaging all the values belonging to each replicated cultivar (10.5 m along the row, i.e., twelve contiguous vines); on the contrary, when the analysis was done over a shorter distance (3.5 m, i.e., four contiguous vines), the reliability of the ultrasonic-based method decreased. Significance and impact of the study: These results point to the ultrasonic technology as a powerful tool to estimate large-scale leaf canopy area, with potential applications in precision farming. At the moment, however, the limitation of this approach is the requirement of reference values for leaf area (e.g., assessed by point quadrat) to obtain absolute and not only relative outputs. With this application we can quantify, in a few hours, the canopy of a whole vineyard, in order to analyze different vegetation zones or to follow canopy development

Surface Studies of Calcium Oxalate Dihydrate Single Crystals During Dissolution in the Presence of Stone-Formers\u27 Urine

Dissolution of calcium oxalate dihydrate (COD) single crystals was studied at different pH levels and in different dilutions of stone formers\u27 (SF) urine. The Fourier descriptors of the contour were determined during dissolution of COD using a quantitative morphological technique. The surface ruggedness of COD single crystals was determined from fractal analysis. The results obtained were compared with COD single crystals behavior in different dilutions of normal urine previously reported. The shape parameters and surface geometry of the dissolving COD crystals were significantly different in normal and SF urine. The data suggest that the shape descriptors and fractal geometry is likely to be a potential factor in identifying the urine of stone formers

Urine Specimens from Pregnant and Nonpregnant Women Inhibitory to Amplification of \u3cem\u3eChlamydia trachomatis\u3c/em\u3e Nucleic Acid by PCR, Ligase Chain Reaction, and Transcription-Mediated Amplification: Identification of Urinary Substances Associated with Inhibition and Removal of Inhibitory Activity

The presence of endogenous amplification inhibitors in urine may produce false-negative results for the detection of Chlamydia trachomatis nucleic acids by tests such as PCR, ligase chain reaction (LCR), and transcription-mediated amplification (TMA). Consecutive urine specimens from 101 pregnant women and 287 nonpregnant women submitted for urinalysis were processed for C. trachomatis detection. Aliquots were spiked with the equivalent of one C. trachomatis elementary body and were tested by three commercial assays: AMPLICOR CT/NG, Chlamydia LCX, and Chlamydia TMA. The prevalence of inhibitors resulting in complete inhibition of amplification was 4.9% for PCR, 2.6% for LCR, and 7.5% for TMA. In addition, all three assays were partially inhibited by additional urine specimens. Only PCR was more often inhibited by urine from pregnant women than by urine from nonpregnant women (9.9 versus 3.1%; P = 0.011). A complete urinalysis including dipstick and a microscopic examination was performed. Logistic regression analysis revealed that the following substances were associated with amplification inhibition: beta-human chorionic gonadotropin (odd ratio [OR], 3.3) and crystals (OR, 3.3) for PCR, nitrites for LCR (OR, 14.4), and hemoglobin (OR, 3.3), nitrites (OR, 3.3), and crystals (OR, 3.3) for TMA. Aliquots of each inhibitory urine specimen were stored at 4 and -70°C and a dilution of 1:10 (84% for PCR, 100% for LCR, and 92% for TMA). Five urine specimens (three for PCR and two for TMA) required phenol-chloroform extraction to remove inhibitors. The results indicate that the prevalence of nucleic acid amplification inhibitors in female urine is different for each technology, that this prevalence may be predicted by the presence of urinary factors, and that storage and dilution remove most of the inhibitors

Influence of Ageing, pH and Various Additives on Crystal Formation in Artificial Urine

In order to investigate the effect of various factors on urinary crystallization processes, a series of five experiments was carried out using an artificial urine (AU) in a rotary evaporator. The influence of ageing, pH and organic, inorganic and potential inhibitory additives formed the basis of the study. Precipitates were characterized by X-ray powder diffraction, scanning electron microscopy and energy dispersive X-ray analysis. In the ageing experiment, AU aliquots, adjusted to various pH values, were allowed to stand for several days and were not evaporated. Calcium oxalate monohydrate (COM) was formed at low pH, while whitlockite, apatite and struvite occurred at pH \u3e 7. In the second experiment, AU aliquots at various pH values, were evaporated. Similar results to those of series 1 were recorded but, in addition, calcium oxalate trihydrate (COT) precipitated in the pH range 3 to 6.5 and brushite at pH \u3e 5.5. In series 3, uric acid, creatinine and urea were included in AU aliquots (pH 5.5) which were subjected to evaporation. Uric acid promoted the formation of uric acid dihydrate; however, when present with creatinine, dihydrate formation was inhibited. Urea appeared to inhibit precipitation. In the fourth experiment, MgO, methylene blue and chondroitin sulphate A were independently included in the AU (pH 5.5). Precipitates of calcium oxalate mono-, di- and trihydrates were obtained. In the final experiment fluoride aliquots of variable concentrations were included in the AU (pH 5.5 and 6.5). COT crystals of superior quality to those observed in control solutions were obtained

Zgon w przebiegu kleszczowego zapalenia mózgu – opis serii przypadków

Tick-borne encephalitis (TBE) is a disease which may present as meningitis, encephalomeningitis and myeloencephalomeningitis. The course of the disease is usually mild although it may result in the patient's death in 1–4% of cases. Patients with myeloencephalomeningitis are the most endangered group, but also encephalomeningitis may have a fatal outcome. There are many risk factors which influence the severity of TBE, including patient's age, immunosuppression and concomitant diseases. We present four cases of patients who died because of TBE. The aim of the paper was to underline that in elderly patients or patients suffering from chronic diseases and additional infections, special attention should be paid to their treatment, including mechanical ventilation and steroid use.Kleszczowe zapalenie mózgu (KZM) może przebiegać pod trzema postaciami: zapalenia opon mózgowo-rdzeniowych, zapalenia mózgu i opon mózgowo-rdzeniowych oraz zapalenia rdzenia, mózgu i opon mózgowo-rdzeniowych. Przebieg choroby jest zazwyczaj łagodny, jednak w przypadku 1–4% pacjentów choroba może zakończyć się zgonem. Grupami najbardziej narażonymi na zgon są pacjenci z zapaleniem rdzenia, mózgu i opon mózgowo-rdzeniowych oraz z zapaleniem mózgu i opon mózgowo-rdzeniowych. Istnieje wiele czynników wpływających na ciężkość KZM, m.in. wiek pacjentów, upośledzenie układu odpornościowego i współistnienie innych chorób. W pracy zaprezentowano opisy czterech przypadków pacjentów, którzy zmarli z powodu KZM. Celem pracy jest podkreślenie, iż w przypadku starszych pacjentów lub pacjentów z chorobami przewlekłymi czy z innymi zakażeniami towarzyszącymi, chorujących na KZM należy zwrócić uwagę na leczenie, w tym respiratoro- i steroidoterapię

Micro-computed tomography assessment of different obturation techniques for filling lateral canals

Background: the aim of this study was to evaluate obturation depth and volume by means of micro-CT when filling lateral canals. Material and methods: thirty single-rooted teeth were used. After instrumentation, three artificial lateral canals were created on each mesial and distal surface (one on each third). The samples were then separated randomly into three groups according to the obturation technique used (n=10): lateral condensation (Group 1), Tagger's hybrid technique (Group 2) and GuttaCore (Group 3). Samples were scanned and data was processed with Avizo software. Depth and volume of the infilling were measured in each lateral canal. Values were expressed as percentages and were analyzed using the Kruskal-Wallis test. Results: mean depth showed statistically significant differences between Group 3 and Groups 1 (p=0.001) and 2 (p=0.003), whereas no significant difference was found between Groups 1 and 2 (p≈1). As for mean volume, significant differences were found between Group 3 and Groups 1 (p=0.01) and 2 (p=0.003) but no differences were found between Groups 1 and 2 (p=1.00). Conclusions: GuttaCore provided the best lateral canal sealing among the three techniques compared. Key words:Lateral canals, Micro-CT, obturation