Deuterated carbohydrate probes as 'label-free' substrates for probing nutrient uptake in mycobacteria by nuclear reaction analysis

Deuterated sugars that are transported into mycobacteria can be detected using ion beam (nuclear reaction) analysis.

Understanding and probing small molecule uptake in cells is challenging, requiring sterically large chemical labels, or radioactive isotopes. Here, the uptake of deuterated sugars by Mycobacterium smegmatis, a non-pathogenic model of Mycobacterium tuberculosis, has been investigated using ion-beam (nuclear reaction) analysis demonstrating a new technique for label-free nutrient acquisition measurement.

Glycopolymers with secondary binding motifs mimic glycan branching and display bacterial lectin selectivity in addition to affinity

Polymer architecture is exploited as an alternative to glycan synthesis to enhance selectivity towards pathogenic lectins.

HIV/AIDS knowledge and high risk sexual practices among southern California Vietnamese

OBJECTIVES

Vietnamese immigration to the U.S. since the conclusion of the Vietnam war has been substantial and in Orange County, CA, Vietnamese Americans comprise 3% of the population (the largest community in the US). Our objective was to collect data on the HIV/AIDS knowledge, attitudes and self-reported high risk behaviours within this community.

METHODS

A survey instrument was administered anonymously in Vietnamese to 532 respondents in their homes. Individuals from three population strata were randomly sampled: men 18 to 35 years old (N = 193); men 36 to 45 years old (N = 137); and women 18 to 35 years old (N = 202). Data were gathered on: (1) degree of acculturation; (2) knowledge and attitudes towards HIV/AIDS; and (3) self-reported sexual and other high risk practices.

RESULTS

Survey data indicated that 38% of respondents were very worried about themselves and 83% were worried about a family member getting AIDS. Knowledge about actual modes of HIV transmission was generally accurate, but a substantial minority still believed that HIV can be transmitted through casual contact, and 68% from needles used in hospitals. Women demonstrated less accurate knowledge than men on five key items. Quarantine of the HIV infected was agreed to by 45%. Twenty-nine percent did not believe that the epidemic would affect them personally, and 49% stated that they did not have enough information about AIDS to protect themselves. Regarding sexual practices, 31% reported never having had sex. Of the others, 8% had two or more sexual partners in the prior 12 months. No same sex behaviour was reported. Six percent of men had visited a female prostitute; of these, 24% had visited 2 or more in the prior 12 months; half of encounters in this time period were outside the US. Substantial percentages of sexually active, unmarried respondents indicated that they never use (17-40%) or only sometimes use (10-32%) condoms. Less than 1% had used injection drugs.

CONCLUSIONS

Education should be targeted at the Vietnamese community of southern California to improve knowledge that HIV cannot be contracted through casual contact, to convey information about methods for self-protection, and to reduce high risk sexual practices such as unprotected sex, sex with multiple partners and sex with prostitutes.

Double-blind comparison of bromocriptine and placebo in cocaine withdrawal

Twenty-nine cocaine-dependent male veterans without other drug dependence completed a double-blind controlled, randomly-assigned study examining the efficacy of bromocriptine versus placebo in the management of cocaine abstinence symptomatology. Serum prolactin (PL) and growth hormone (GH) levels were obtained prior to and after the study was completed. Patients were seen daily and completed several self-report questionnaires, including the Symptom Checklist-90-Revised, the Beck Depression Inventory, and a Cocaine Craving Report. The patients were also asked to rate a variety of cocaine withdrawal symptoms. Overall, there did not appear to be any advantage to receiving bromocriptine versus placebo during the first 3 weeks following cocaine use cessation with the possible exception of changes in activity and appetite level. The placebo group showed a statistically significant increase in activity level during the first week in treatment and a significant increase in appetite throughout the study. Patients in both groups showed significant improvement in the other areas assessed, with improvement appearing to progress according to length of treatment. Hyperprolactinemia or abnormal GH levels were not found in this patient sample as a group. Thirty-four of the original 63 patients dropped out of the study. Seventeen received bromocriptine, and 17 received placebo. There was no significant difference between drug groups in incidence of retaining patients in treatment. The high dropout rate may reflect the difficulty incurred in retaining cocaine-dependent patients in treatment.

Public health and the media in California: a survey of local health officers

Increasingly, public health interventions are dependent on effective health communications. There are, however, few data examining the relationship and interactions between local public health officers and representatives of the media in the literature. This study sought to collect data on the quality and quantity of interactions between California's 62 local health officers and the media. A survey form was sent to the health officers representing all 58 county and four city health departments in the State of California to assess the extent of media interaction, the existence of institutional media policies, the professional and personal character of media relations, the perceived accuracy of media reporting, use of the media for health education and advocacy, the availability of training in media relations for staff members, and whether media interaction facilitated or impeded achievement of public health objectives. Differences in responses according to the population of the political jurisdiction also were assessed. With 87 percent of the health officers responding, 51 percent reported 10 years or more experience interacting with the media; 65 percent said they dealt with the print media mostly on a daily, twice weekly, or weekly basis. In only 19 jurisdictions were there written policies on media relations, but in 43, media releases undergo a pre-release review. Most health officers characterized media relations as reactive, and 80 percent said they were appropriate and had an educational impact. Media interactions were largely believed to be of benefit to the public and were not generally perceived as adversarial. Health officers were of the opinion that media representatives could become more technically and scientifically knowledgeable on public health issues but also indicated that they or their own public health staff would benefit from continuing education on managing media relations. Eighty-six percent stated that the media strongly or moderately facilitate the achievement of public health objectives. Further study of this important component of public health practice is warranted.

Late CT detection of gas in an aortic graft: a normal postoperative finding

Presence of gas in the prosthetic graft bed does not necessarily represent infection, but may rather be indicative of the presence of benign gas. The diagnostic and therapeutic implications of this finding are discussed.

The effects of ethanol on brain blood flow in awake dogs

Ethanol produces a generalized decline in brain flow in awake dogs. The reduction in flow is most marked and persistent in the cerebellum. In the anesthetized animal with brain blood flow already depressed, this effect is obscured. The possible relationship of these findings to the acute and chronic effects of ethanol on the central nervous system in humans is discussed.

The effects of ethanol on pancreatic blood flow in awake and anesthetized dogs

The pathophysiology of alcohol-induced acute pancreatitis is not clear. Ischemic injury has been suggested as a possible mechanism. To examine the effects of ethanol on pancreatic and splanchnic blood flow, measurements were made in fasted, conditioned awake dogs before and after iv infusion of ethanol (1.7 g/kg). At 30 min blood ethanol concentration ranged between 60 and 150 mg/dl and at 60 min between 166 and 350 mg/dl. Although cardiac output, aortic pressure, left atrial pressure, and arterial pH did not change, pancreatic flow declined by 39 +/- 12 ml/min/100 g, P less than 0.05 (from 173 +/- 10 ml/min/100 g) at 30 min and was still depressed (by 27 +/- 12 ml/min/100 g, P less than 0.05) at 60 min. Concomitantly, hepatic arterial flow increased. While hepatic and pancreatic flow changed inversely, the correlation (r = -0.17) of these changes was not significant. At comparable blood ethanol concentrations in pentobarbital-anesthetized dogs hepatic arterial flow increased by 11 +/- 3 ml/min/100 g, P less than 0.01 (from 24 +/- 5 ml/min/100 g), but pancreatic flow did not change. Thus, in the awake dog at blood levels that would produce mild to moderate alcoholic intoxication in man, ethanol reduces pancreatic flow. Although hepatic flow increases concomitantly, the relationship of these changes appears to be independent.