The effects of parental traumatic brain injury on the behaviour of parents and children

Little is known about the effects of a parent's brain injury and subsequent disabilities on the children in the family. This study examines 24 families in which one parent is brain injured. In each family the children were born before the parent's injury and still lived at home at the time of interview. Reports of the uninjured parent indicate that most of the children experienced some degree of negative behavioural change after the parent's injury. In 10 of the families, significant and problematic changes occurred. Types of problems included poor relationship with the injured parent, acting-out behaviour and emotional problems. Correlates of poor outcomes for the children were: (1) injured parent's gender, (2) compromised parenting performance of the injured parent, (3) compromised parenting performance of the uninjured parent and (4) depression in the uninjured parent. This study points to the importance of recognizing traumatic brain injury as a major family stressor.     

Response to contradiction: Scientific reasoning during adolescence.

In this study we examined how students restructure their scientific ideas in response to contradiction. Using equal numbers of male and female subjects, we presented 166 students aged 12, 13, and 14 with two conditions. In one interview condition, students were asked to make predictions about how much water would be displaced by objects of varying size, shape, and weight. They were then asked to test their predictions with physical apparatus by actually immersing objects in water. In the other inteview conditions, students were presented with the same experiences, but with an additional early opportunity to examine the equipment and to generate alternative variables. At first, subjects' predictions were generally wrong (in that they were guided by a weight rule). Gradually, most students changed their predictions in the face of contradictory evidence to a correct rule (volume). During the interview, boys learned the correct rule more quickly than did girls. However, there was a significant Sex?×?Treatment interaction for girls who had the additional opportunity to examine the equipment. We concluded that for girls, such additional experiences may (a) compensate for an initial lack of familiarity with formal experimental setting and (b) encourage them to use analogical reasoning processes to generate a list of potentially relevant variables. Furthermore, we noted that conceptual change requires reflection and that science educators should support the learner's mechanisms for restructuring information. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Cognitive responses to stress: Effects of changes in demand and sex.

Replicated a previous study with female Ss by M. J. Horowitz and S. Becker (see record 1972-02452-001) testing the theory that increased intrusive and repetitive thought after exposure to stressful events is a cognitive response tendency occurring in general population groups. Reports by 1 female and 27 male students of mental contents before and after neutral and stress films were analyzed. Data contrasted for male and female Ss and for different instructional demands show that the stress film exerted a significant influence on increase in intrusive and stimulus-repetitive thought; male-female differences and demand effects were nonsignificant. Results support the hypotheses that intrusive and repetitive thinking are general cognitive responses to stress and that such changes in conscious experience can be quantified in the laboratory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Influence of sodium bicarbonate on growth and health of young calves

Fifty-four Holstein and Jersey calves were assigned at 4 days of age within breed and sex to one of four treatments: control consisting of colostrum, milk replacer, and starter; buffered colostrum and replacer (.6% sodium bicarbonate) and starter (2% sodium bicarbonate); acidified colostrum (1% propionic), untreated replacer, and starter; and acidified, buffered colostrum (1% propionic, .6% sodium bicarbonate), buffered replacer (.6% sodium bicarbonate), and starter (2% sodium bicarbonate). The feeding regimen was colostrum once daily, day 4 to 14; milk replacer once daily, day 15 to 28; and calf starter ad libitum, day 4 to 84. Bull calves were fed for 42 days and heifers for 84 days. Calves fed acidified colostrum refused more feed and were less efficient from day 4 to 14 than calves fed buffered colostrum. Bulls were more sensitive to acidified colostrum than heifers. Starter intake, total dry matter intake, and average daily gains were similar for all calves during days 4 to 84. Rumen fluid from calves fed diets with sodium bicarbonate was higher in acetate and lower in propionate and lactate than that from calves fed diets without sodium bicarbonate. Sodium bicarbonate improved intake of acidified colostrum during the first 2 or 3 days of feeding but had no other effect on gain or feed intake.     

Locus of control in childhood hyperactivity.

Compared to 16 8–12 yr old normal males, 16 age-matched hyperactive males were more external as determined by scores on the Nowicki-Strickland Locus of Control Scale. The measurement of locus of control in a hyperactive population provides useful information about how hyperactive children compare to others in their expectancies concerning the link between environmental stimuli and their consequences. (5 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Admissions testing on trial.

Criticisms of test use in educational admissions decisions frequently stem from fundamental disagreements about underlying values but may still be couched in test-specific technical terms. A. Nairn's (1980) claims regarding predictive validity are discussed, and the erroneous and misleading nature of these claims is demonstrated. The alternative of relying on previous grades alone rather than in combination with tests for purposes of admissions is reviewed. Criticisms of tests based on issues of bias, coachability, and secrecy are discussed and evaluated. (63 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

食用农产品中产志贺毒素大肠埃希菌污染与家庭厨房食物安全现状分析及防控措施

本文通过对食用农产品中产志贺毒素大肠埃希菌(STEC)来源与传播途径分析,阐述了STEC污染与家庭厨房食物安全之间的关系,并对当前世界各国食品中STEC的监管情况进行阐述,从而提出我国控制食用农产品中STEC进入家庭厨房的解决方案。     

食品检测用产肠毒素大肠埃希氏菌标准物质的制备及评价

目的 制备并评价产肠毒素大肠埃希氏菌（ETEC）标准物质。方法 分别用基质辅助激光解吸电离（MALDI-TOF MS）、生化、16 s RNA基因序列测定三种方法确认菌株种属。采用冷冻干燥技术制备600个ETEC标准样品（103CFU/样品）;从中随机抽取20个进行均匀性检验;模拟25℃和37℃的运输温度测试样品的运输稳定性,同时在4℃和-20℃的条件下进行保藏稳定性检验。组织3家实验室对样品进行协同验证。最后选择20件食品基质来验证样品的使用效果。结果 生化、MALDI-TOF MS、16 s RNA基因序列鉴定CMCC(B)43208为大肠埃希氏菌,lt、stp、sth基因确认其为ETEC。均匀性检验中,单因素方差分析得F=1.48,小于FINV(0.05,19,20)。稳定性检验中,在25℃和37℃保藏7 d后结果为103CFU/样品,在-20℃保藏60 d和4℃保存28 d后结果为103CFU/样品。协同标定实验中,3家实验室检测样品中菌株均为ETEC(103CFU/标准样品)。使用效果评价中,ETEC标准样品加入20种食品基质后均可检出,而本底对照均未检出。结论 本实验制备的...