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PubMed2006

Fabrication of photoprocessible azo polymer microwires through a soft lithographic approach.

In this work, a soft lithographic approach has been developed to fabricate free-standing azo polymer microwires with unique photoprocessible characteristics. In the process, an epoxy-based azo polymer (BP-AZ-CA) was used to prepare both the soft lithographic masters and the microwires. The masters were prepared by photofabricating surface relief gratings on BP-AZ-CA thin films. Then the elastomeric stamps were prepared by replica molding of poly(dimethylsiloxane) prepolymer against the masters. With use of the stamps and a solution of BP-AZ-CA as "ink", the microwires were prepared by contact printing and wet etching. The microwires possessed a uniform sub-micrometer-scale transverse dimension and macroscopic longitudinal dimension. Those characteristic sizes depended on the adjustable features of the masters and stamps used in the process. The transverse dimension of the microwires could be altered after exposure to a linearly polarized Ar+ laser single beam with the polarization direction perpendicular to the longitudinal axes of the microwires. Upon irradiation of interfering p-polarized Ar+ laser beams, regular surface relief structures could be inscribed on the microwires along the longitudinal direction, which coincided with both the polarization direction of the laser beams and the grating vector direction of the interference pattern. The microwires with photoprocessible properties are potentially usable as sub-micrometer-scale materials in future miniaturized components and devices. The approach reported in this work can be further extended to the fabrication of nano-/microwires from other polymeric materials.

Journal Article↗

PubMed2006

Edge transfer lithography using alkanethiol inks.

Edge lithographic patterning techniques are based on the utilization of the edges of micrometer-sized template features for the reproduction of submicrometer structures. Edge transfer lithography (ETL) permits local surface modification in a single step by depositing self-assembled monolayers onto a metal substrate selectively along the feature edges of an elastomeric stamp. In this report two stamp designs are described that now allow for the use of alkanethiol inks in ETL and their use as etch resists to reproduce submicrometer structures in gold. Anisotropically modified stamps are shown to combine the potential for very high-resolution patterning with the versatility and simplicity of microcontact printing.

Alkanes↗

PubMed2006

Large-scale synthesis and formulation of GMP-grade stampidine, a new anti-HIV agent.

The arylphosphoramidate derivative of stavudine (STV, d4T, 2,3'-didehydro-3'-deoxythymidine, CAS 3056-17-5), stampidine (STAMP, DDE-113, HI-113, N-[p-(4-bromophenyl)-2',3'-didehydro-3'-deoxy-5'-thymidylyl]-L-alanine methyl ester, CAS 217178-62-6), is a novel anti-HIV agent. STAMP was prepared under current Good Manufacturing Practice (cGMP) conditions on the scale of kilograms. Solid STAMP was subsequently formulated as a capsule under GMP conditions for oral administration.

Anti-HIV Agents↗

PubMed2006

Developmental safety profile of the anti-HIV agent stampidine in rabbits.

Stampidine (STAMP, DDE-113, HI-113, N-[p-(4-bromophenyl)-2',3'-didehydro-3'-deoxy-5'-thymidylyl]-L-alanine methyl ester, CAS 217178-62-6) is a novel aryl phosphate derivative of stavudine (STV, d4T, 2',3'-didehydro-3'-deoxythymidine, CAS 3056-17-5) with potent anti-HIV activity. The reproductive and developmental safety profile of STAMP was evaluated in mated New Zealand white rabbits. STAMP did not adversely affect the reproductive health of female rabbits and it lacked teratogenicity or other developmental toxicity in their progeny.

Animals↗

PubMed2006

Site-specific enzymatic activation of the anti-HIV agent stampidine.

Stampidine (STAMP, DDE-113, HI-113, N-[p-(4-bromophenyl)-2',3'-didehydro-3'-deoxy-5'-thymidylyl]-L-alanine methyl ester, CAS 217178-62-6) and two stampidine analogs containing ethyl or t-butyl groups were synthesized and their rates of enzymatic activation were compared side-by-side. Enzymes such as lipase, esterase and protease did not hydrolyze the butyl substituted STAMP analog. These experimental results show that the site of attack for the enzymatic hydrolysis of STAMP is the ester side chain of the molecule.

Alkalies↗

PubMed2000

Patterned deposition of cells and proteins onto surfaces by using three-dimensional microfluidic systems.

Three-dimensional microfluidic systems were fabricated and used to pattern proteins and mammalian cells on a planar substrate. The three-dimensional topology of the microfluidic network in the stamp makes this technique a versatile one with which to pattern multiple types of proteins and cells in complex, discontinuous structures on a surface. The channel structure, formed by the stamp when it is in contact with the surface of the substrate, limits migration and growth of cells in the channels. With the channel structure in contact with the surface, the cells stop dividing once they form a confluent layer. Removal of the stamp permits the cells to spread and divide.

Animals↗

PubMed2000

Improving the quality of the order-writing process for inpatient orders and outpatient prescriptions.

Because many preventable medication errors occur at the ordering stage, a program for improving the quality of writing inpatient orders and outpatient prescriptions at one institution was developed. To determine whether potential problems existed in the order-writing process for inpatients, all physician orders for a seven-day period in 1997 were reviewed (n = 3740). More than 10% of all orders had illegible handwriting or were written with a felt-tip pen, which makes NCR copies difficult to read. Other potential errors were also identified. Following educational programs for physicians and residents focusing on the importance of writing orders clearly, physician orders were reviewed for a 24-hour period (n = 654). The use of felt-tip pens decreased to 1.37% of all orders, and no orders had illegible handwriting. A similar quality improvement approach was used to evaluate the outpatient prescription-writing process. A review of all new prescriptions for a consecutive seven-day period at a local hospital-owned community pharmacy (n = 1425) revealed that about 15% of the prescriptions had illegible handwriting and roughly 10% were incomplete. Additional data were gathered through a survey sent to 71 outside provider pharmacies requesting information on problems related to prescriptions written by physicians from the institution; 66% responded. Failure to print prescriber name (96%), illegible signature (94%), failure to include DEA number (89%), and illegible handwriting other than signature (69%) were reported as the main problems. Each physician was given a self-inking name stamp to use when writing prescriptions. In addition, educational programs covering examples of poorly written prescriptions and the legal requirements of a prescription were held for physicians and residents. A follow-up survey showed that 72% of pharmacies saw stamps being used; when stamps were not used, however, illegible signatures continued to be a problem. Follow-up reviews of outpatient prescriptions indicate improvements in handwriting and completeness, but continuing educational efforts are needed. The quality of order writing for inpatients and outpatients continues to be monitored on a regular basis. Ongoing educational programs, follow-up reminders, and feedback to physicians have greatly improved the prescription-writing habits of physicians.

Ambulatory Care↗

PubMed1991

The effect of two mailing strategies on the response to a survey of physicians.

In 1989, the authors tested the effectiveness of two response-enhancing techniques, a postage stamped or franked return envelope and a prenotification letter, in a survey of pregnancy among 10,047 resident physicians in the United States. The techniques were randomly assigned using a factorial design. No significant interactions were observed between the techniques. After two mailings, those who received a stamped return envelope had a response of 71.2%, compared with 68.2% for those who received a franked return envelope (95% confidence interval 1.3-4.9%). Men who received the stamped envelope had a 5.9% greater response than those who received the franked envelope (p less than 0.001), but the type of postage did not influence response among women (p = 0.84); this interaction was statistically significant (p = 0.006). Physicians who received a prenotification letter had a response of 69.0%, compared with 70.5% for those who did not receive the letter (95% confidence interval -3.3 to 0.2%). The authors conclude that seemingly minor changes in survey design could have saved from 12% to 19% of the total cost of the study.

Confidence Intervals↗

PubMed2002

Living on the edge: examination of people attending food pantries and soup kitchens.

This article presents information from a study of people receiving food assistance services from food pantries and soup kitchens in Virginia. The data indicate that significant numbers of individuals and families--many of whom are employed--are seeking food assistance. Many of these individuals also have been homeless, victims of domestic violence, unable to pay their utility bills, or have lost their public benefits. A critical issue raised by the findings is the low rate of participation in the food stamp program. Fewer than 40 percent of the respondents were receiving food stamps. Although the food stamp program is intended to help households buy a nutritionally adequate diet, there is growing concern that a large segment of low-income Americans are slipping through this safety net. The article concludes with suggestions for social work interventions to address issues of food security.

Adult↗

PubMed2001

Aligned microcontact printing of biomolecules on microelectronic device surfaces.

Microcontact printing (muCP) of extracellular matrix proteins is a fascinating approach to control cell positioning and outgrowth, which is essential in the development of applications ranging from cellular biosensors to tissue engineering. Microelectronic devices can be used to detect the activity from a large number of recording sites over the long term. However, signals from cells can only be recorded at small sensitive spots. In this paper, we present an innovative setup to perform aligned muCP of extracellular matrix proteins on microelectronic devices in order to guide the growth of electrogenic cells specifically to these sensitive spots. Our system is based on the combination of a fine-placer with redesigned micro stamps having a rigid glass cylinder as backbone for attachment in the alignment tool. Alignment is performed moving the device with an optical table under microscopic control of the superimposed images from stamp and device surface. After successful alignment, the stamp is brought into contact with the device surface by means of a high-precision lever. With our setup, we were able to pattern up to 40 devices per hour. A lateral alignment accuracy of < 2microm has been achieved. Aligned neuronal growth on patterned devices was demonstrated with dissociated hippocampal neurons.

Animals↗

PubMed1999

The prevalence and effects of hunger in an emergency department patient population.

OBJECTIVES: Little is known about the prevalence and health effects of hunger among ED patients. The objectives of this study were to determine the prevalence of hunger among patients in a large urban ED and to examine whether it has adverse health effects. METHODS: A survey about hunger, choices between buying food and buying medicine, and adverse health outcomes related to food adequacy over the preceding 12 months was administered to a convenience sample of adult non-critically ill ED patients from afternoon and evening shifts. The study was conducted in the ED of Hennepin County Medical Center in Minneapolis, Minnesota. RESULTS: Of the 302 eligible patients who were asked to participate, 297 (98%) agreed. Eighteen percent reported not having enough to eat at least once in the preceding 12 months: 14% reported that they had "gotten sick" as a result of not being able to afford their medicine, resulting in an ED visit or hospital admission 50% of the time. Predictors of making choices about buying food vs medicine include having a chronic health condition, lack of private health insurance, having a reduction in food stamps, having an annual income less than $10,000, and lack of alcohol use. By patient report, a reduction in food stamps was a predictor of ED visits and hospitalizations as a result of making choices about buying food over medicine. CONCLUSION: The ED patients in this urban setting have high rates of hunger and many must make choices between buying food and medicine, which patients report results in otherwise preventable ED visits and hospitalization. Loss or reduction of food stamps is associated with increased hunger and increased perceived adverse health outcomes as a result of not being able to afford medicine.

Adolescent↗

PubMed1995

Two-dimensional blood flow determinations in allergic reactions using laser Doppler scanning.

The new technique of laser Doppler scanning (LDS) provides a 2-dimensional pattern of cutaneous microcirculation, which offers a visual image and can quantify the intensity and expansion of perfusion. With the help of this technique, we examined the microcirculatory pattern of Type IV reactions to recall antigens, which were applied using a test stamp (Multitest Merieux). The measurements were performed before application of the test stamp as well as 10 min, 24, 48 and 72 h afterwards. The inflammatory hyperemia was evaluated using LDS and unidimensional laser Doppler fluxmetry. The diameter of the inflammatory infiltrate was quantified by means of palpation, the thickness by means of high-resolution 20 MHz sonography. The clinically visible erythema was measured planimetrically. An unspecific hyperemia resulting from the trauma of the stamp revealed no evident infiltrate under sonography 10 min after the test application. Depending of the individual reaction, the mean flux and the expansion of the hyperemia were at their peak after 48 h. The flux values were at a maximum in the center of the inflammatory reaction and dropped continuously toward the periphery. The area of the hyperemia seen in the LDS image was significantly larger than the expansion of the erythema measured planimetrically, but there was a significant correlation. The perfusion correlated significantly with the infiltration diameter (24 h, 48 h, 72 h) and the infiltration thickness 48 h after testing. All in all, it was possible to measure directly and without touching the skin and to quantify a subclinical pattern of skin perfusion as a response to and inflammatory reaction on a 2-dimensional display.

Adult↗

PubMed1999

Microcontact printing for precise control of nerve cell growth in culture.

Microcontact printing, facilitated by silane linker chemistry and high-relief stamps, creates precise patterns of proteins, which in turn control growth of hippocampal neurons in culture. This additive, multi-mask technique permits several different molecules to be patterned on the same substrate. The covalent linker technology permits relatively long-term (two-week) compliance of neurons to the stamped pattern against a polyethylene glycol background. When polylysine was stamped adjacent to a laminin/polylysine mixture, neural somata and dendrites preferred the polylysine while axons prefer the mixture or the border between the two.

Animals↗

PubMed1999

Managing an animal health emergency in Taipei China: foot and mouth disease.

Taipei China had been free from foot and mouth disease (FMD) over 68 years before the disease occurred in March 1997. The first suspected case was recorded on a pig farm in the Hsinchu Prefecture on 14 March 1997. Based on clinical signs, gross histopathological findings, and results of enzyme-linked immunosorbent assays and reverse-transcriptase polymerase chain reaction tests, diagnosis of FMD was confirmed by the Taiwan Animal Health Research Institute on 19 March 1997 and was reconfirmed by the FMD World Reference Laboratory in Pirbright (United Kingdom), on 25 March 1997. By the end of July 1997, 6,147 pig farms (about a quarter of the pig farms in Taipei China), were affected. The disease was well under control within two months by means of stamping-out and blanket vaccination. The Government purchased 21 million doses of inactivated oil-adjuvant FMD vaccine, which allowed for two injections per pig and one injection of other cloven-hoofed animals. Before the vaccine was used, the stamping-out policy was implemented, ensuring that all pigs in the affected farms were destroyed. After blanket vaccination, a partial stamping-out policy was adopted, i.e. only pigs showing clinical signs were destroyed.

Animals↗

PubMed2000

Threat mail and forensic science: DNA profiling from items of evidence after treatment with DFO.

Two cases of threatening letters with their accompanying envelopes were received to the Division of Forensic Identification unit of the Israel Police. The envelopes, including the stamps, and the letters were initially examined for latent fingerprints by the DFO reagent, known to cause degradation of DNA. Although no latent fingerprints could be visualized on any of the items, the biology laboratory using organic DNA extraction, was successful in defining genetic profiles from all the items employing six STR loci, even after treatment with DFO. In a controlled experiment, a known donor attached a stamp, by licking, to an envelope. This item was treated with DFO and then profiled using STR loci. The results showed that previous DFO treatment on the control stamp before DNA analysis had no negative effects on obtaining the DNA profile of the known donor using STR loci.

Aza Compounds↗

PubMed2001

[Support for cancer research and therapy with regard to its incidence].

With the current annual incidence of about 63,000 new cancers in the Czech Republic and with 320,000 treated diseases it is necessary to make use of all experience to warn the population against cancer. The treatment of more than 8 million oncological patients in the U.S.A. demands more than 100 billions dollars per a year. In order to support it, a postage stamp with an extra charge of 8 cents was issued in 1998. The 200 mil. pieces will bring given an expected profit of 16 mil. dollars which will be to the research of breast cancer. That is why a proposal has been submitted to issue the first Czech postage stamp with the topic of cancer prevention. The aim is to draw the people's attention to the risk of cancer and to support the healthy way of life. The issuing of the stamp will not include any extra charge for the support cancer treatment.

Breast Neoplasms↗

PubMed2002

The effect of 1,2-indanedione, a latent fingerprint reagent on subsequent DNA profiling.

The compound 1,2-indanedione was recently introduced in our laboratory as an operational reagent for developing latent fingerprints on porous surfaces. As part of the reagent implementation, a study was carried out in order to determine whether either of the two operational 1,2-indanediones formulations interferes with further DNA profiling. Both formulations are based on HFE7100 solvent. One is acidic and the other neutral. In a controlled experiment, known donors attached stamps to envelopes by licking them. The stamped envelopes were initially treated with either one indanedione formulation or the other, and DNA was then extracted for STR typing. No differences were observed between the STR profiles obtained from treated and untreated stamps and envelopes, indicating that 1,2-indanedione does not adversely affect the extraction and subsequent amplification of the STRs examined. However, preliminary results indicate that potential DNA analysis depends on the time interval between the indanedione treatment and DNA extraction as no DNA can be recovered six days following treatment. For this reason, it is strongly recommended to extract DNA from treated items of evidence as soon as possible after indanedione treatment.

DNA↗

PubMed1997

Health official emphasizes increase in malaria, AIDS, and TB incidence. International (Zimbabwe).

Zimbabwe has recorded more than 255,000 cases of malaria since the rainy season began last November, 1996. Almost 500 infected people have died of the disease. The death toll from malaria during the same period a year ago was 200; in all, over 2000 people died of malaria in 1996. The increase in disease incidence is attributed to the especially wet rainy season Zimbabwe is experiencing this year. Conditions are favorable for the disease-carrying mosquitoes to breed. Timothy Stamps, Zimbabwe's Minister of Health and Child Welfare, announced these figures at the Medic Africa 1997 exhibition held in Harare on April 16, 1997. According to an article by Segun Adeyemi, a Panafrican News Agency correspondent, Stamps told "some of the continent's top scientists attending [the exhibition] that the health challenges facing African and other developing countries [remain] as daunting as ever." HIV/AIDS research updates also were presented at the exhibition, a 3-day international medical event which includes conferences and seminars presented primarily by research scientists. According to Adeyemi, Stamps told his audience that "the HIV/AIDS pandemic continues to decimate critical human resources and overwhelm the health care system with no respite in sight." "Coupled with that," Adeyemi wrote, "was the vengeful return of tuberculosis, which had since become more difficult to treat and cure. The disease had hitherto been brought under control through immunization and multi-drug therapy."

Africa↗