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Trends in imprint lithography for biological applications.

Imprint lithography is emerging as an alternative nano-patterning technology to traditional photolithography that permits the fabrication of 2D and 3D structures with <100 nm resolution, patterning and modification of functional materials other than photoresist and is low cost, with operational ease for use in developing bio-devices. Techniques for imprint lithography, categorized as either 'molding and embossing' or 'transfer printing', will be discussed in the context of microarrays for genomics, proteomics and tissue engineering. Specifically, fabrication by nanoimprint lithography (NIL), UV-NIL, step and flash imprint lithography (S-FIL), micromolding by elastomeric stamps and micro- and nano-contact printing will be reviewed.

Animals↗

Marker vaccine strategies and candidate CSFV marker vaccines.

Classical swine fever (CSF) is an economically important highly contagious disease of swine worldwide. Classical swine fever virus (CSFV) is its etiological agent, and the only natural hosts are domestic pigs and wild boars. Although field CSFV strains vary in the virulence, they all result in serious losses in pig industry. Highly virulent field strains generally cause acute disease and high mortality; moderately virulent field strains raise subacute or chronic infections; postnatal infection by low virulent field strains produces subclinical infection and mortality in the new-born piglets. CSFV can cross the placental barrier, and this transplacental transmission usually results in mortality of fetuses and birth of congenitally infected pigs with a late-onset disease and death. Two main strategies to control CSF epidemic are systematic prophylactic vaccination with live attenuated vaccines (such as C-strain) and non-vaccination stamping-out policy. But neither of them is satisfying enough. Marker vaccine and companion serological diagnostic test is thought to be a promising strategy for future control and eradication of CSF. During the past 15 years, various candidate marker vaccines were constructed and evaluated in the animal experiments, including recombinant chimeric vaccines, recombinant deletion vaccines, DNA vaccines, subunit vaccines and peptide vaccines. Among them, two subunit vaccines entered the large scale marker vaccine trial of EU in 1999. Although they failed to fulfil all the demands of the Scientific Veterinary Committee, they successfully induced solid immunity against CSFV in the vaccinated pigs. It can be expected that new potent marker vaccines might be commercially available and used in systematic prophylactic vaccination campaign or emergency vaccination in the next 15 years. Here, we summarized current strategies and candidate CSFV marker vaccines. These strategies and methods are also helpful for the development of new-generation vaccines against other diseases.

Animals↗

Control and prevention of avian influenza in an evolving scenario.

Continuing outbreaks of highly pathogenic avian influenza (HPAI) across Eurasia and in Africa, caused by a type A influenza virus of the H5N1 subtype appear out of control and represent a serious risk for animal and public health worldwide. It is known that biosecurity represents the first line of defence against AI, although in certain circumstances strict hygienic measures appear to be inapplicable for social and economic conditions. The option of using vaccination against AI viruses of the H5 and H7 subtypes, has made its way in recent times--primarily as a tool to maximise the outcome of a series of control measures in countries that are currently infected, but also as a means of reducing the risk of introduction in areas at high risk of infection. In developing countries vaccination programmes in avian species have been recommended recently, however it will require concurrent management of local husbandry practices and industry compliance to eradicate the disease rather than the establishment of an endemic situation. Other key deliverables expected for this control strategy include maintaining a major source of food for rural communities and the preservation of the commercial viability of the local poultry industry. In developed countries vaccination is being used as a means of increasing resistance of susceptible animals to reduce the risk of introduction from the reservoir host or to reduce secondary spread in densely populated poultry areas. The recent joint OIE/FAO summits recommended applying vaccination, using the differentiating infected from vaccinated animals (DIVA) strategy when there is risk of major spread and depopulation is not feasible or desirable. Particularly in developing countries, stamping out of infected animals does not seem to be an appropriate means of reducing the spread of infection, if food supplies are to be guaranteed and economic consequences minimised. Crucial points to the success of a vaccination campaign are the implementation of complex territorial strategy involving upgraded biosecurity, monitoring vaccine efficacy, identification of field exposure and the appropriate management of infected flocks, regardless of vaccination status. Granting financial support for the compensation of farmers is also a key part of this strategy. Poultry veterinarians working for the industry or for the public sector represent the first line of defence against the pandemic threat and for the prevention and control of this infection in poultry and in wild birds.

Animals↗

Monte Carlo simulation of classical swine fever epidemics and control. I. General concepts and description of the model.

A Monte Carlo simulation has been developed to describe the spread of classical swine fever virus between farms within a certain region. The data of the farms can be imported and considered individually. Transmission occurs via the infection routes direct animal and indirect person and vehicle contact, as well as by contaminated sperm and local spread. Parameters, such as incubation period and probability of detection, can be varied by the user and their impact on disease spread can be studied. The control measures stamping-out, movement control and pre-emptive slaughter in circular restriction areas as well as contact tracing can be applied and their effect on disease spread can thus be analysed. The numbers of culled and restricted farms and animals per epidemic and per day within an epidemic, the epidemic duration and the total length of restrictions per restricted farm are given. In an example, simulation runs were performed under the condition of application of all four-control measures. Because no real farm data were available, a test area was generated stochastically with a farm density of 1.3 farms/km(2). The distributions of the number of infected farms per epidemic and the epidemic length are shown.

Animals↗

Pro and contra IBR-eradication.

Bovine herpesvirus type 1 (BoHV-1) is the causative agent of respiratory and genital tract infections such as infectious rhinotracheitis (IBR), infectious pustular vulvovaginitis (IPV, balanoposthitis (IBP), and abortion. Despite of a pronounced immune response, the virus is never eliminated from an infected host but establishes life-long latency and may be reactivated at intervals. Europe has a long history of fighting against BoHV-1 infections, yet, only a small number of countries has achieved IBR-eradication. Therefore, it seemed appropriate to review the reasoning pro and contra such a task. Clearly, the goal can indeed be achieved as has been demonstrated by a number of European countries. However, detection and stamping out of seemingly healthy virus carriers is inevitable in the process. Unfortunately, the use of vaccines is only of temporary and limited value. Therefore, there are numerous considerations to be put forward against such plans, including the high costs, the great risks, and the unsatisfactory quality of tools. If either control or eradication of IBR is nonetheless a goal, then better vaccines are needed as well as better companion tests. Moreover, better tools for the characterization of viral isolates are required. Collaborative actions to gather viral strains from as many countries as possible for inclusion into a newly created clustering library would be most advantageous.

Animals↗

Smoking cessation in primary care: a clinical effectiveness trial of two simple interventions.

BACKGROUND: Many primary care practices do not have systematic protocols to identify patients who smoke or to encourage clinicians to provide smoking cessation advice. We designed a study to assess the relative effectiveness of two brief interventions on screening for smoking, physician cessation advice and patient smoking cessation rates. METHODS: We performed a nonrandomized comparison of alternative strategies for smoking cessation at a hospital-based adult primary care practice. Each intervention was implemented on a separate practice team. The "minimal" intervention consisted of a smoking status "vital sign" stamp which documented patient smoking status. The "enhanced" intervention consisted of a five-question form that assessed patient level of cessation readiness and provided cessation-counseling prompts for clinicians. Medical record documentation of screening for smoking and cessation advice and self-reported patient smoking cessation rates were collected 8-10 months after implementation. RESULTS: Smoking status was documented at 86%, 91%, and 49%, and cessation advice at 38%, 47%, and 30% of visits on the minimal, enhanced, and control teams, respectively (P < 0.001 for smoking status and P = 0.014 for advice). Self-reported patient smoking cessation was higher on the enhanced team (12%) compared with the minimal (2%) and control (4%) teams (P < 0.001). CONCLUSIONS: A short questionnaire that assesses readiness-to-quit and provides documentation of cessation advice improves rates of clinician cessation advice and patient smoking cessation compared with no intervention.

Adult↗

Improving meat inspection and control in resource-poor communities: the Nepal example.

Meat is an important source of protein and a valuable commodity in resource-poor communities. In many developing countries, lack of appropriate slaughtering facilities and unsatisfactory slaughtering techniques are causing unnecessary losses of meat as well as invaluable by-products from animal carcasses. Slaughtering places are frequently contaminated and may not be protected against dogs, rodents and insects. Meat products coming from such conditions are often deteriorated due to bacterial infection or contaminated, which may cause food poisoning or diseases in consumers. In many developing countries, regulations concerning meat inspection and/or control are inadequate or non-existent allowing consumers to be exposed to pathogens including zoonotic parasites. In Nepal, buffaloes contribute about 64% of the meat consumed, followed by goat meat (20%), pork (7%), poultry (6%) and mutton (2%). Goat and poultry meat is acceptable to all castes of people while buffalo meat is consumed mainly by the Newar ethnic group. Previously, pork was consumed only by people belonging to low castes, however, in recent years, the consumption of pork has increased in higher castes as the caste system has become more relaxed. Until recently, there were no official meat inspection regulations in the country, however, in 1999, the national government legislated an as-yet-to-be implemented Animal Slaughtering and Meat Inspection Act which mandates slaughterhouse construction and meat inspection and control. Due to the lack of implementation of the Meat Inspection Act and resultant absence of meat inspection, meat from sick or parasite-infected animals is serving as a source of infection to humans as well as other animals. In addition, meat quality is adversely affected by careless handling conditions in the slaughtering places as well as in the meat markets or shops. For improvement in animal slaughtering and meat inspection in both rural and urban areas of Nepal, several strategies are to be recommended. Sustainable capacity building should be introduced including training of veterinarians, meat inspectors and butchers as well as building of slaughter facilities. Government policies on slaughter procedures including ante-mortem examination, meat inspection and stamping of meat should be implemented. Programmes should be instituted with strong focus on prevention and control of meat-borne diseases to reduce infection risk of consumers and meat handlers and to avoid contamination of the environment. Lastly, emphasis should be put on improving the animal husbandry system in Nepal. These same actions can be undertaken in other developing countries to assist with improving meat inspection and control, thus helping with prevention and control of cysticercosis as well as other important meat-borne diseases.

Animals↗

A video lesson series is effective in changing the dietary intakes and food-related behaviors of low-income homemakers.

OBJECTIVE: To examine the relative cost-effectiveness of a self-administered video series in delivering nutrition education to low-income homemakers. DESIGN: A quasi-experimental design was used, with subjects randomly assigned to traditional lessons (Traditional Group) or video lessons (Video Group). SUBJECTS/SETTING: 108 subjects were recruited, with 93 nonpregnant, low-income, female homemakers completing the study (response rate = 86%). Subjects had recently enrolled in the Expanded Food and Nutrition Education Program, or the Food Stamp Nutrition Education Program, and had a videocassette recorder and telephone. INTERVENTION: Both groups received 12 lessons from the Eating Right Is Basic Series, 3rd edition, with the Traditional Group being taught in face-to-face sessions and the Video Group receiving self-administered, video-lesson packets. OUTCOME MEASURES: Dietary intake and food behaviors were assessed at pre and post intervention with 24-hour recalls and a 14-item checklist. STATISTICAL ANALYSES: Chi(2) and t tests were used to compare the groups on demographics and pre-intervention dietary factors. Multiple analysis of variance was used for comparisons of change from pre to post intervention. RESULTS: Significant improvements were observed in both groups for fruits, calcium, and vitamins A and C. The Video Group improved on fiber intake (P<or=.005). The groups did not differ on dietary or behavior change (P=.2357). Duplication and implementation costs of the video series totaled 4,820 dollars, or 36% of the traditional lesson cost of 13,463 dollars. APPLICATIONS: Both methods achieved similar improvements in diet and behaviors, but the video method was less expensive. The video series seems to be a cost-effective method for delivering nutrition education to low-income homemakers.

Adolescent↗

Evaluation of validity of items for a food behavior checklist.

OBJECTIVES: To evaluate the validity of food behavior items, using a biological measure (serum carotenoids) as the criterion for validity of fruit and vegetable intake, and the results from multiple 24-hour recalls to test convergent validity with nutrient intake. DESIGN: Participants responded to 39 food-behavior questions and later completed three 1-day dietary recalls. Serum carotenoid levels were determined for a 59% randomly selected subsample. SUBJECTS/SETTING: A convenience sample of 100 English-speaking, low-income women participating in a Food Stamp Nutrition Education Program in 8 California counties. Statistical analyses Spearman correlation coefficients were calculated between responses to the food behavior items and (a) serum carotenoid levels and (b) mean nutrient intakes from the 24-hour recalls. Cronbach's coefficient alpha was determined for items within broad food behavior topics. RESULTS: Responses to 10 food behavior items were significantly correlated with serum carotenoid levels (correlations greater than 0.45 were found for choosing low-fat foods and a self-evaluation of overall dietary quality). An additional 12 items showed hypothesized associations with the 24-hour recall data (with a maximum correlation 0.50 for number of eggs per week and dietary cholesterol). Cronbach's coefficient alpha ranged from 0.28 (for 5 fat and cholesterol items) to 0.79 (for 9 fruit and vegetable items). APPLICATIONS/CONCLUSIONS: Nutrition professionals can use these methods to validate items for food behavior checklists for specific populations. The items described here may be useful when designing instruments to administer to low-income women in a community setting.

Adult↗

Food management practices used by people with limited resources to maintain food sufficiency as reported by nutrition educators.

The food management practices used by people with limited resources to ensure food sufficiency have not been fully characterized. Semistructured interviews were conducted with 51 nutrition educators from the New Jersey Expanded Food and Nutrition Education Program and Food Stamp Nutrition Education Program, regarding the food management practices of program participants. Practices were grouped into two categories using the constant comparative method: manage food supply (n = 14) and regulate eating patterns (n = 15). Well-documented stratagems, such as overeating when food is available and cycling monthly eating patterns, were confirmed. Novel practices were identified. Practices causing food safety or nutritional risks included removing spoiled sections, slime, mold, and insects from food; eating other people's leftovers; and, eating meat found as road kill. A foundation was formed for a grounded theory concerning food management practices by people with limited resources. Verification of these results with audiences with limited resources and determination of prevalence and relative risk of these practices is necessary. This research is important for nutrition professionals who work with people with limited resources because it elucidated a spectrum of safe and risky food management practices, proposed methods to ameliorate monthly eating pattern cycles, and exposed the possibility of food insecurity in unsuspected cases.

Adolescent↗

Prenatal and perinatal factors associated with breast-feeding initiation among inner-city Puerto Rican women.

OBJECTIVE: To identify factors associated with the initiation of breast-feeding in a predominantly Puerto Rican population living in inner-city Hartford, Conn. DESIGN: Retrospective study of 144 Latino women (mean +/- standard deviation age = 26.3 +/- 5.7 years) with children at least 1 year old but younger than 6 years old (mean +/- standard deviation age = 3.0 +/- 1.2 years) at the time of the survey. Women were recruited from agencies sponsoring health programs for mothers and children. They were interviewed in their homes (69%) or at the Hispanic Health Council, Hartford, Conn (31%). SUBJECTS/SETTING: Low-income Latino women who had at least 1 preschooler at the time of the interview. The women lived in inner-city Hartford, and the overwhelming majority were Puerto Rican and received welfare assistance and food stamps. Seventy-eight percent of the women chose to be interviewed in Spanish; the other 22% were interviewed in English. STATISTICAL ANALYSES: Explanatory variables that related to breast-feeding initiation (P < or = .2) in bivariate chi 2 analyses were entered into a multivariate logistic regression model that was reduced using backward stepwise elimination procedures. RESULTS: Multivariate analyses indicated that breast-feeding the previous child, shorter length of maternal residence in the United States, not receiving prenatal bottle-feeding advice, more recent birth, and higher birth weight were positively associated with breast-feeding initiation. A major reason for choosing not to breast-feed was that women felt socially uncomfortable doing it. APPLICATIONS: Breast-feeding initiation was more likely in Latino women who received prenatal breast-feeding counselling and postpartum support. Mothers of low-birth-weight infants and women breast-feeding for the first time may need additional help. These findings can be used by programs like the Special Supplemental Nutrition Program for Women, Infants, and Children to increase breast-feeding initiation.

Breast Feeding↗

Enhancing didactic education through participation in a clinical research project.

The purpose of this study was to assess self-evaluation of knowledge and skills (e.g., counseling, education, interviewing, and assessment skills) of students participating as research assistants. Fifteen students enrolled in the Dietetics Program (n = 10) or the Graduate Program in Nutrition (n = 5) were recruited as research assistants via flyers and announcements in nutrition courses. These students assisted faculty researchers with their clinical study called "Weight Loss Effects on Bone Mass in Adolescent Females." The clinical study included a comprehensive 6-month weight-loss program. Surveys asking students to evaluate their experience as research assistants were mailed with a self-addressed, stamped envelope to all 15 student research assistants, followed by a reminder telephone call. Thirteen surveys (87%) were returned. On a Likert scale (1 = poor, 5 = excellent) student research assistants scored 63% of the knowledge-based and skill-based requirements of their research participation as "good" (mean score > or = 4.0) and 27% as "adequate" (4.0 > or = mean > or = 3.5). Open-ended questions reported the research experience to be beneficial in developing knowledge and skills and in identifying knowledge deficits (e.g., behavior modification). According to our findings, it seems that participation in clinical research enhances students' knowledge and skills and, thus, is valuable in preparing dietetics students for future practice.

Adolescent↗

Circadian variation of sustained ventricular tachycardia in patients subject to standard adrenergic blockade.

Morning peaks in the circadian variation of sustained ventricular tachycardia (VT) may reflect the contribution of sympathetic activation to onset of VT. We hypothesized that adrenergic blockade would eliminate this morning peak. Fifty-four patients using a defibrillator had 1114 time-stamped episodes of VT requiring therapy with a device: 1012 episodes with and 102 episodes without antiadrenergic medications. Nine patients had episodes both with and without antiadrenergic medication and were examined separately. In patients taking antiadrenergic agents, data fitted to a harmonic regression model revealed a morning peak at 9:00 AM (R2= 0.542; p < 0.05), with a secondary peak at 4 PM. Those not receiving antiadrenergic therapy had a similar morning peak. Antiadrenergic agents as used in standard clinical practice do not prevent circadian variation in onset of VT. This variation may be mediated by systems other than adrenergic receptor-linked activation or may reflect inadequacy of adrenergic blockade in standard clinical dosing.

Adrenergic beta-Antagonists↗

Hepatic tumor enhancement in computed tomography: combined models of liver perfusion and dynamic imaging.

The objective of this study is to show how computational modeling can be used to increase our understanding of liver enhancement in dynamic computer tomography. It relies on two models: (1). a vascular model, based on physiological rules, is used to generate the 3D hepatic vascular network; (2). the physical process of CT acquisition allows to synthesize timed-stamped series of images, aimed at tracking the propagation of a contrast material through the vessel network and the parenchyma. The coupled models are used to simulate the enhancement of a hyper-vascular tumor at different acquisition times, showing a maximum conspicuity during the arterial phase.

Algorithms↗

Comparison of plasma hormone changes using a "conventional" and a "paper" pill formulation of a low-dose oral contraceptive.

Two formulations of a low-dose oral contraceptive (Microgynon: 150 microgram of levonorgestrel [NG] +30 micrograms of ethynylestradiol [EE2]) were studied. The first was the "conventional" pill; the second was a "paper" pill prepared by evaporation of aliquots of a solution of the component steroids onto squares of edible cellulose separated by perforations, similar to a sheet of postage stamps. The effects of the two formulations on plasma levels of follicle-stimulating hormone (FSH), luteinizing hormone (LH), 17beta-estradiol (E2), and progesterone were compared. Samples of blood were obtained from five women during a treatment period on the "conventional" pill and from five on the "paper" pill. When possible, blood samples were also obtained from a "control" cycle of each of these female subjects. Plasma LH, FSH, E2, and progesterone levels were determined by specific radioimmunoassay methods during control and treatment periods and NG and EE2 levels during treatment periods. Eight-hour plasma profiles for NG and EE2 at the beginning and in the later stage of the treatment periods were obtained and these samples were also analyzed for LH, FSH, E2, and progesterone. Results showed that with one exceptcrogynon were equally effective in suppressing ovulation. As in a previous study, FSH levels appeared to be one of the most sensitive indices of suppression.

Adult↗

Two-dimensional micro-separation technique for proteins and peptides, combining isoelectric focusing and gel gradient electrophoresis.

The two-dimensional combination of gel electrofocusing and gel gradient electrophoresis yields separate information about differences in net charge and molecular weight of macro-ions. A micro-version of this technique is described. The first dimension electrofocusing run is performed in cylindrical polyacrylamide gel of capillary size, using xylene cyanole FF as a reliable marker dye to indicate the final separation stage when proteins reach their isoelectric points. In the second-dimension run the focused proteins are separated in a continuous slab gel gradient of less than stamp size with total acrylamide concentration ranging from ca. 1% to more than 40%. Spreading of peaks in the gradient slab gel is shown to be related to the approach of protein to its pore limit in the gel. This spreading is a useful indicator of the final position of a protein in the gel if molecular weights are estimated according to the separation pattern in the gradient gel. The method described has been developed for the separation of proteins extracted from large single cells (i.e., neurons of the mollusc Aplysia californica.

Electrophoresis, Polyacrylamide Gel↗

Formalities, good faith, and tissue donation.

After a patient died in a Veterans Administration hospital, a resident physician asked the next of kin to sign two identical autopsy forms, one of which was stamped "Eye Donor." The family signed, despite orally objecting to donation of tissue. Nevertheless, the patient's eyes were removed because other hospital staff were unaware of the objection. The family sued the hospital and eye bank. The Federal District Court in Minnesota dismissed the case before trial on the basis that both defendants were immune from liability because of the Uniform Anatomical Gift Act. Clear policies communicated to staff and separate autopsy and donation forms can help to avoid confusion and legal difficulties.

Consent Forms↗

The influence of bright background flicker during different saccade periods on saccadic performance.

We investigated saccades from central fixation to targets at 5 degrees to the left or right. These targets were red laser points of light with an intensity unmodulated in time (referred to as steady), while a bright background (76 cd/m(2)) was illuminated by a special fluorescent lamp, the output of which were series of light pulses (at frequencies of 50 or 100 Hz) that were presented only during certain periods, in synchrony with the saccade: e.g. during fixation of the central target, or during the latency (i.e. the period from target onset to saccade onset), or during the execution of the saccade; otherwise, the background luminance was steady. We observed a mean increase in latency of about 23 ms when 50 Hz flicker pulses occurred during the latency alone. This result is interpreted in terms of saccadic inhibition [Reingold & Stampe, (2000) In: Kennedy, Radach, Heller, & Pynte (Eds.) Reading as a perceptual process. Elsevier, Amsterdam]: our bright background flicker during the latency may have produced longer latencies, similar to the remote distractors in the model of Findlay and Walker [Behav. Brain Sci. 22 (1999) 661].

Algorithms↗