Physical Challenge and the Development of Trust through Corporate Adventure Training

1998 ◽  
Vol 21 (1) ◽  
pp. 31-34 ◽  
Author(s):  
Simon Priest
2008 ◽  
Vol 20 (2) ◽  
pp. 295 ◽  
Author(s):  
N. A. Czarny ◽  
K. E. Mate ◽  
J. C. Rodger

The spermatozoa of most marsupials lack nuclear stabilising disulfide-bonded protamines found in eutherian mammals. However, disulfide stabilisation has been observed in the acrosome of macropodid (Macropus eugenii) and phalangerid (Trichosurus vulpecula) marsupials. As a result this organelle, which is normally fragile in eutherian mammals, is robust and able to withstand physical and chemical challenge in these marsupials. The present study examined acrosomal characteristics of the spermatozoa of three dasyurid marsupials; the fat-tailed dunnart (Sminthopsis crassicaudata), eastern quoll (Dasyurus viverrinus) and northern quoll (Dasyurus hallucatus). In all species examined Bryan’s staining demonstrated that significant acrosomal loss occurred following physical challenge with osmotic stress, cryopreservation without cryoprotectant and exposure to detergent (Triton-X). Bromobimane staining indicated that the acrosomes of dasyurids lacked stabilising disulfide bonds. As reported for the wallaby and possum, calcium ionophore (A23187) did not induce the acrosome reaction-like exocytosis in dasyurid spermatozoa but treatment with diacylglycerol (DiC8) caused significant acrosome loss at concentrations similar to those effective for other marsupials. The present study found that the spermatozoa of dasyurids are more sensitive to physical challenge than the previously-studied marsupials and we suggest that this is due to the absence of acrosomal stabilising disulfide bonds.


1971 ◽  
Vol 17 (4) ◽  
pp. 437-445 ◽  
Author(s):  
Francis J. Kelly ◽  
Daniel J. Baer

A study was conducted to determine whether a program of severe physical challenge can be more effective than a traditional training school experience in reducing further delinquency by adolescent boys adjudicated delinquent. Effectiveness was meas ured by comparing the recidivism rates between two matched groups. An experimental group (N=60) attended Outward Bound schools while a comparison group (N=60) was treated in a routine manner by the Massachusetts Division of Youth Serv ice. One year after parole, the recidivism rates for the two groups were compared. Only 20 per cent of the experimental group recidivated, as opposed to 42 per cent of the comparison group. Background variables such as age of first court appearance, pres ence of both parents in the home, first institutionalization, and type of offense were important conditions affecting recidivism. The results suggest that for some delinquents a program such as Outward Bound, which presents a severe physical challenge, is a desirable alternative to traditional institutional care and should be considered as a model for improving current correc tional programs. It appears that those delinquents who are re sponding to an adolescent crisis rather than to a character defect would profit most from such a program.


2020 ◽  
Vol 128 (4) ◽  
pp. 317-324
Author(s):  
Eva Wolf ◽  
Erin McCarthy ◽  
Gisela Priebe

Hippocampus ◽  
2002 ◽  
Vol 12 (6) ◽  
pp. 765-773 ◽  
Author(s):  
Maren Büchner ◽  
Roman Huber ◽  
Matthias W. Riepe

1992 ◽  
Vol 15 (2) ◽  
pp. 50-53 ◽  
Author(s):  
Jim Bronson ◽  
Steve Gibson ◽  
Roxanne Kichar ◽  
Simon Priest

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