Heart rate variability, the change in the time intervals between adjacent heartbeats, is an emergent property of interdependent regulatory systems that operates on di!erent time scales to adapt to environmental and psychological challenges. This article briefly reviews neural regulation of the heart and o!ers some new perspectives on mechanisms underlying the very low frequency rhythm of heart ...

Obligate aerobic AMF taxa have high species richness under waterlogged conditions, but their ecological role remains unclear. Here we focused on AM fungal mediation of plant interactions in a marshland plant community. Five cooccurring plant species were chosen for a neighbor removal experiment in which benomyl was used to suppress AMF colonization. A Phragmites australis removal experiment was...

In a series of papers from 1954 to i960 Harker published the results of her work on the neuro-endocrine control of the circadian rhythm of locomotor activity in the cockroach, Periplaneta americana (see Harker, 1964). The most important conclusions of these papers are: that the rhythm is controlled by a neurosecretory cycle occurring in the sub-oesophageal ganglion and endogenously timed therei...

Neuroendocrine glands that synthesize and secrete peptide hormones regulate the levels of these peptide messengers during development. In this article we describe a mechanism for regulating neuropeptide levels in the corpora cardiaca of the locust Schistocerca gregaria, a neuroendocrine gland structurally analogous to the vertebrate adenohypophysis. A set of five colocalized peptide hormones of...

In plant virus ecology, weeds are regarded as wild reservoirs of viruses and as potential sources for insect-mediated transmission of viruses. During field surveys in 2013-2014, three Leonurus sibiricus plants showing virus-like symptoms were collected from pepper fields in Daegu, Seosan, and Danyang in Korea. Molecular diagnosis assays showed that the collected L. sibiricus samples were infect...

y edemas maleolares gravitativos, junto a síncopes desencadenados por maniobras de Valsalva. En la exploración física destacaba la presencia de ingurgitación yugular, pulso paradójico y hepatomegalia. Un ecocardiograma transtorácico evidenció la presencia de una masa retroesternal que comprimía la pared anterior de ventrículo derecho. La resonancia magnética cardiaca y la tomografía axial compu...

La insuficiencia renal es un importante factor pronóstico en pacientes con insuficiencia cardiaca. Para valorar la función renal se suelen utilizar las cifras de creatinina sérica. Sin embargo, cifras normales pueden ocultar una insuficiencia renal establecida. Hemos evaluado el significado pronóstico del aclaramiento de creatinina estimado (Cockcroft) en 235 pacientes con insuficiencia cardiac...

Release of neurohormone from putative cephalic neurohemal organs was directly demonstrated in an insect. The prothoracicotropic hormone (PTTH) of the tobacco hornworm, Manduca sexta, was measured indirectly by its ability to stimulate the secretion of alpha-ecdysone by inactive prothoracic glands; the ecdysone was measured by radioimmunoassay. The PTTH released spontaneously from intact brain-r...