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D M Avery

Publications and source records attributed to D M Avery.

7 recordsLinked to original sources
PubMed2001

The Plio-Pleistocene vegetation and climate of Sterkfontein and Swartkrans, South Africa, based on micromammals.

Micromammalian remains from Oldowan and Acheulean horizons in Sterkfontein Member 5E (M5E-O and M5E-A) and Swartkrans Members 1-3 (SKX1-3) provide information for the period between about 2 and 1 Ma. Another small sample from Sterkfontein Member 4 (M4) refers to a short period around 2.8-2.6 Ma and material from Sterkfontein post Member 6 infill (post-M6) relates to the Middle Stone Age occupation around 100 ka. Virtual absence of evidence of digestion on in situ lower molars of the major prey species, Mystromys albicaudatus, indicates that one of the owls Tyto alba, T. capensis or Asio capensis was the responsible predator. Over-emphasis on riverine grassland supports this suggestion, as does faunal resemblance between the Sterkfontein Valley samples and modern prey samples for the three owl species concerned. The location of the roost and the range of prey species point to the barn owl T. alba. There is no indication of differential bias between samples. South African species of eagle owl (Bubo spp.) are ruled out. All samples appear to represent interglacial conditions. The Grassland-Savanna ecotone probably lay nearby, as did the border between Moist and Arid Savanna. Possible modern analogues occur about 200 km west and southwest of the valley more than 250 m lower in altitude. South of Mafikeng all three vegetation types intergrade but the rainfall is higher than that postulated for some of the units in the Sterkfontein Valley. Similar climatic conditions occur near Kuruman and Kimberley where Arid Savanna merges into Grassland. Landscape information indicates a succession from riverine grassland, sometimes with Acacia trees, through hillsides with bush, grass and some trees, to plains with open savanna woodland. The suggested climate for the Sterkfontein Valley varied between +/-310 mm and possibly 550 mm mean annual precipitation, summer aridity index 3.8-4.1 and percentage winter rainfall 23-24. Minimum and maximum monthly temperatures would have been higher than they are today but with the temperature range reduced.

Animals↗
PubMed2001

The hen house.

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Health Personnel↗
PubMed1986

Comparison of the cardiovascular effects of intravenous and intraaortic protamine in the conscious and anesthetized dog.

Controversy exists as to whether intraaortic (IA) administration of protamine sulfate has less adverse effects than the intravenous (IV) route. The effect of protamine on contractility is not well established. Therefore, 9 dogs underwent chronic instrumentation to monitor aortic pressure (AP), left ventricular (LV) pressure, central venous pressure, cardiac index (CI), heart rate, stroke volume index (SVI), systemic vascular resistance index, and LV volume. The end-systolic LV pressure-volume relationship was used as a load-independent measure of contractility. Each dog was administered IV and IA protamine on separate occasions after pretreatment with heparin. Studies were performed with and without anesthesia. In the awake studies, analysis of variance showed greater decreases in mean AP (p less than .03), CI (p less than .05), and SVI (p less than .02) with IA protamine infusion. In the anesthetized animals, there were no significant differences between IA and IV administration of protamine. Protamine did not decrease contractility in any group. We conclude that IA administration of protamine offers no advantage over IV administration in the dog. Protamine does not decrease contractility when given by either route.

Analysis of Variance↗
PubMed1983

Papillary adenomas of prostatic urethra with ultrastructural histogenetic considerations.

Benign urethral lesions are rather uncommon, and relatively few cases have been described in the literature. Malignant neoplasms, such as squamous and transitional cell carcinomas, occur more frequently. The latter usually present as papillary lesions. Specifically, papillary adenomas of the prostatic urethra are very unusual and rare lesions. They are usually seen in children but occasionally are found in the adult. Symptoms include urinary obstruction, infection, enuresis, sexual disturbances, or hematuria. Two cases of papillary adenomas are presented in this article. The lesion is important because it can be a source of significant hematuria, but can be cured easily at cystoscopy by local excision. This article describes the electron microscopic findings in two of these tumors, trying to elucidate their histogenesis and nature. No ultrastructural studies of these lesions have been reported previously.

Aged↗
PubMed1980

Lactose-positive Vibrio in seawater: a cause of pneumonia and septicemia in a drowning victim.

Lactose-positive Vibrio is a recently recognized marine organism that has pathogenic potential for humans. An organism was isolated from the sputum and blood of a man who was resuscitated after drowning in the sea. The isolates from both sources had the characteristics of lactose-positive Vibrio, which include positive oxidase, citrate, indole, and o-nitrophenyl-beta-D-galactopyranoside reactions and negative Voges-Proskauer, urease, and sucrose reactions. Seawater samples from 21 sites around Galveston Island were cultured for lactose-positive Vibrio over a period of 4 weeks, and 36% of the samples yielded the organism. The environmental isolates were very similar to the clinical isolates in biochemical reactions and susceptibility to antimicrobial agents. The results indicate that lactose-positive Vibrio is a common organism in the marine environment and that it should be considered in the diagnosis of infections, including pneumonia, associated with exposure to the sea.

Adult↗