A neotropical perspective on the uniqueness of the Holocene among interglacials.

Understanding how tropical systems have responded to large-scale climate change, such as glacial-interglacial oscillations, and how human impacts have altered those responses is key to current and future ecology. A sedimentary record recovered from Lake Junín, in the Peruvian Andes (4085 m elevation) spans the last 670,000 years and represents the longest continuous and empirically-dated record of tropical vegetation change to date. Spanning seven glacial-interglacial oscillations, fossil pollen and charcoal recovered from the core showed the general dominance of grasslands, although during the warmest times some Andean forest trees grew above their modern limits near the lake. Fire was very rare until the last 12,000 years, when humans were in the landscape. Here we show that, due to human activity, our present interglacial, the Holocene, has a distinctive vegetation composition and ecological trajectory compared with six previous interglacials. Our data reinforce the view that modern vegetation assemblages of high Andean grasslands and the presence of a defined tree line are aspects of a human-modified landscape.

Challenges in implementing the new BASHH guidelines for the management of gonorrhoea.

Neisseria gonorrhoeae has progressively developed reduced sensitivity to different classes of antibiotics. The British Association for Sexual Health and HIV (BASHH) updated guidelines for the diagnosis and management of gonorrhoea in 2011. New recommendations include an increased dose of ceftriaxone with adjuvant use of azithromycin, as well as test of cure (TOC) in all cases. We present an audit of adherence to new antibiotic prescribing guidelines as well as TOC uptake in an inner city genitourinary medicine clinic. Among the 271 (242 male, 29 female) patients included, 96% (n = 260) received the new first-line treatment. Test of cure uptake was found to be suboptimal at 55% (n = 149) with the majority (67%) of these taking place within 20 days of treatment. The new first-line treatment for gonorrhoea is feasible and generally accepted by patients. However the TOC uptake is low, emphasising the need for robust follow-up and recall policies. Further study is required into the optimal timing for TOC.

The antidiabetic activity of aloes: preliminary clinical and experimental observations.

The dried sap of the aloe plant (aloes) is one of several traditional remedies used for diabetes in the Arabian peninsula. Its ability to lower the blood glucose was studied in 5 patients with non-insulin-dependent diabetes and in Swiss albino mice made diabetic using alloxan. During the ingestion of aloes, half a teaspoonful daily for 4-14 weeks, the fasting serum glucose level fell in every patient from a mean of 273 +/- 25 (SE) to 151 +/- 23 mg/dl (p less than 0.05) with no change in body weight. In normal mice, both glibenclamide (10 mg/kg twice daily) and aloes (500 mg/kg twice daily) induced hypoglycaemia after 5 days, 71 +/- 6.2 and 91 +/- 7.6 mg/dl, respectively, versus 130 +/- 7 mg/dl in control animals (p less than 0.01); only glibenclamide was effective after 3 days. In the diabetic mice, fasting plasma glucose was significantly reduced by glibenclamide and aloes after 3 days. Thereafter only aloes was effective and by day 7 the plasma glucose was 394 +/- 22.0 versus 646 +/- 35.9 mg/dl, in the controls and 726 +/- 30.9 mg/dl in the glibenclamide treated group (p less than 0.01). We conclude that aloes contains a hypoglycaemic agent which lowers the blood glucose by as yet unknown mechanisms.