大学校园绿地规划设计

就大学校园绿地规划设计的问题，介绍了大学校园绿地的分类，从几个方面阐述了大学校园绿地规划的设计要点，以使大学校园的绿地规划做到更好。     

Cell survival at low oxygen tension and dose build-up in argon

Mammalian cells were exposed to 250 kVp X-irradiation in air, argon and nitrogen to determine whether cells irradiated when severely hypoxic have survival curves with lower extrapolation numbers (n) than their aerobic counterparts. Cells irradiated suspended in liquid showed no significant differences between values of 'n' irrespective of the gas used, neither was the sensitivity of cells irradiated in argon any greater than that of cells irradiated in nitrogen. In contrast, cells attached to glass dishes irradiated with the medium withdrawn were apparently much more sensitive in argon than in nitrogen. It has been demonstrated that the lower survival of cells irradiated in argon could have been caused by the greater photoelectric absorption in argon compared with nitrogen. When the dosimetric discrepancy was removed either by absorption of photoelectrons in liquid or by use of high energy radiations, there was no evidence that severe hypoxia during irradiation could lead to reduced values of 'n'.     

Effect of early exposure to patterned sound on unit activity in rat inferior colliculus

1. Young rats were exposed to one of two patterns of sounds for 5 h daily during the first 4 mo of life. The up pattern consisted of a tone swept from 6 to 9 kHz in 1 s alternated with a 1-s noise burst. The down pattern differed in that the sweeps were from 9 to 6 kHz. 2. A pattern evoked more spikes, on the average, from units in the inferior colliculus of rats exposed to that pattern than from units in animals exposed to the other pattern. 3. The exposure effect was most pronounced in the unit responses to the noise-burst segment within a pattern suggesting a long-lasting, malleable influence of the tone sweep which defined the pattern. Responses to pattern noise components were less for both exposed groups than for the unexposed controls, suggesting that inhibitory mechanisms were responsible for the pattern discrimination evident in the responses of the exposed unit population. 4. Unit responses in unexposed rats were somewhat more selective for the down pattern so that the resulting shift in response selectivity was relatively more apparent for exposure to the up pattern. 5. While control and down-exposed units generally responded more to both the tone sweep and noise burst in one pattern, a large proportion of the up-exposed unit population continued to favor the down over the up-swept tone, but responded more to the up-pattern noise bursts. This suggests that the unit responses to the noise bursts did not simply reflect prolonged responses to the tone sweeps. 6. No similar effects were seen for units from mothers similarly exposed to the same patterns.     

Renal failure after snake bite

Three cases of acute renal failure after snake bite are presented. All required dialysis and the recovery phase was prolonged in each case. Investigations show that microangiopathic haemolytic anaemia was associated with the acute renal failure.     

Clinical significance of plasma chlorpromazine levels. I. Plasma levels of the drug, some of its metabolites and prolactin during acute treatment

An unidentified ninhydrin-positive substance found in uremic sera but not found in normal sera was isolated by gel-filtration through Sephadex G-75 followed by high voltage paper electrophoresis (pH 3.5), and identified as beta-aminoisobutyric acid using paper chromatography and automated amino acid analyzer. The quantitative determination of beta-aminoisobutyric acid in serum revealed that the level of beta-aminoisobutyric acid in uremic sera was much higher than that of normal sera. Gas chromatographic determination of the enantiomorphs of beta-aminoisobutyric acid showed that uremic sera contain R- and S-isomers of the amino acid, but with the R-isomer as the dominating form.     

Spontaneous remission of recurring disseminated intravascular coagulation associated with prostatic carcinoma

A 58-year-old patient with metastatic prostatic carcinoma had two well-documented episodes of disseminated intravascular coagulation (DIC) occurring 1 year apart and resolving without heparin therapy. This case illustrates that DIC need not have a poor prognosis and may resolve spontaneously despite progressive cancer. The efficacy of heparin therapy is discussed.     

Measurement of anti-enzyme antibodies using an active-site directed radiolabel

A new technique is described for measuring antibodies to an enzyme which is not available in pure form. The secretions of the rat parasitic nematode, Nippostrongylus brasiliensis, were treated with tritiated diisopropylfluorophosphate. Only one component, an acetylcholinesterase, was radiolabelled. Antibodies to this enzyme in rat antisera were estimated by the Farr technique using the labelled enzyme as antigen. The acetylcholinesterase secreted by Necator americanus, the human hookworm, was similarly specifically labelled.