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The lethal principle of Poa huecu (coiron blanco): a plant indigenous to Argentina.

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The lethality of Poa huecu, a plant toxic to cattle and sheep, was followed by injection of chromatographic fractions in mice. The lethal aqueous extract was administered i.p. to Rockland mice of either sex and produced motor incoordination, transient ataxia, rough hair coat, tremors and muscle

Androgen enhances neuronal degeneration in the developing preoptic area: apoptosis in the anteroventral periventricular nucleus (AVPvN-POA).

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Perinatal treatment of female rats with androgen decreases the nuclear volume of the anteroventral periventricular nucleus of the preoptic area (AVPvN-POA). In order to examine the effect of androgen on neurogenesis, bromodeoxyuridine (BrdU) was given once on Day 15 of gestation (= E15) to pregnant

Microbial succession of nitrate-reducing bacteria in the rhizosphere of Poa alpina across a glacier foreland in the Central Alps.

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Changes in community structure and activity of the dissimilatory nitrate-reducing community were investigated across a glacier foreland in the Central Alps to gain insight into the successional pattern of this functional group and the driving environmental factors. Bulk soil and rhizosphere soil of

Impact on Salivary Gland Degeneration by Putative Ecdysteroid Antagonists and Agonists in the Ixodid Tick Amblyomma hebraeum

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Ecdysteroids cause salivary gland degeneration in female ixodid ticks. We tested the effects of the following compounds on salivary gland degeneration in the ixodid tick Amblyomma hebraeum Koch: HHCS (22S,23S-homocastasterone), SSBR (22S,23S-homobrassinolide), STGM

Telencephalic afferents in the goldfish: an anterograde degeneration study.

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Terminals of ascending afferents in the telencephalon of the goldfish were examined by the Fink-Heimer method, after the unilateral transection of the peduncular region containing the forebrain bundles. The ascending projections from the more caudal regions of the brain were seen mainly on the

Some properties of the ecdysteroid receptor in the salivary gland of the ixodid tick, Amblyomma hebraeum.

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Salivary gland degeneration in ixodid ticks is triggered by an ecdysteroid hormone. We used [3H]ponasterone A (PoA) as a specific ligand to detect the ecdysteroid receptor in the salivary glands of large, partially fed female ticks (Amblyomma hebraeum Koch; Acari: Ixodidae). Binding of [3H]PoA was

Neuronal death in the developing sexually dimorphic periventricular nucleus of the preoptic area in the female rat: effect of neonatal androgen treatment.

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Neonatal treatment of female rats with androgen decreases the nuclear volume of the anteroventral periventricular nucleus of the preoptic area (AVPv-POA). In order to examine the effect of androgen on the neural substrates in the developing AVPv-POA which show a sexual dimorphism in nuclear volume,

Kainic acid lesioning of the preoptic area alters positive feedback of estrogen in prepubertal female rats.

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Stereotaxic infusion of kainic acid (KA) was performed to induce intrinsic neural lesions of the preoptic area (POA) in 25-day-old female rats. After KA infusion, rats in Experiment 1 received 10 micrograms of estradiol benzoate (EB) administered subcutaneously to assess positive feedback of EB on

Infections present on admission compared with hospital-acquired infections in acute ischemic stroke patients.

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BACKGROUND To date, few studies have assessed the influence of infections present on admission (POA) compared with hospital-acquired infections (HAIs) on neurologic deterioration (ND) and other outcome measures in acute ischemic stroke (AIS). METHODS Patients admitted with AIS to our stroke center

Connectivity and neurochemistry of the commissura anterior of the pigeon (Columba livia).

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The anterior commissure (AC) and the much smaller hippocampal commissure constitute the only interhemispheric pathways at the telencephalic level in birds. Since the degeneration study from Zeier and Karten (), no detailed description of the topographic organization of the AC has been performed.

Impact of dietary exposure to methoxychlor, genistein, or diisononyl phthalate during the perinatal period on the development of the rat endocrine/reproductive systems in later life.

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To evaluate the impact of dietary exposure to endocrine disrupting chemicals (EDCs) during the sensitive period of brain sexual differentiation, maternal Sprague-Dawley rats were fed three representative chemicals, methoxychlor (MXC; 24, 240, and 1200 ppm), genistein (GEN; 20, 200, and 1000 ppm), or

Intracerebral administration of antisense oligodeoxynucleotides to GAD65 and GAD67 mRNAs modulate reproductive behavior in the female rat.

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Increased GABA activity in the medial hypothalamus (HYP) and midbrain central gray (MCG), but not the preoptic area (POA), facilitates sexual receptivity in the female rat [40]. In the current experiments, ovariectomized females were chronically treated with estrogen (via silastic capsules) to

A horizontally transferred nuclear gene is associated with microhabitat variation in a natural plant population.

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Horizontal gene transfer involves the non-sexual interspecific transmission of genetic material. Even if they are initially functional, horizontally transferred genes are expected to deteriorate into non-expressed pseudogenes, unless they become adaptively relevant in the recipient organism.

[Allelopathy and chemical constituents of Ligularia virgaurea volatile].

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Ligularia virgaurea is a noxious weed widely distributed on the psychro-grasslands of east Qinghai-Tibet Plateau of China, but the allelopathic effects of its volatile is less known. In this study, the allelopathy of L. virgaurea volatile to 5 kinds of grasses was examined, and its chemical

Transgenic Zebrafish Expressing mCherry in the Mitochondria of Dopaminergic Neurons.

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Genetic mutations and environmental toxins are known to affect mitochondrial health and have been implicated in the progressive degeneration of dopaminergic neurons in Parkinson's disease. To visualize mitochondria in dopaminergic neurons of live zebrafish, we used the regulatory elements of the

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