太和县夏玉米新品种的产量性状和适应性分析

在大田条件下,研究了5个夏玉米新品种在太和县的产量性状和生态适应性.结果表明:安隆4号和鲁单98l较对照郑单958植株高大,各生育时期叶面积指数较高,叶片的功能期较长,籽粒灌浆期较对照延长5～7天,单稳重增加56.0～76.8 g,籽粒产量增加13.11‰～20.58%.安隆4号对玉米大、小叶斑病、锈病和螟虫等抗性优势明显;蠢玉16号和鲁单981适应性和抗病性较强,对玉米锈病具有显著抗性;中科11号轻感锈病,滑单986严重感染锈病,影响籽粒产量.在太和县生态环境条件下,安隆4号和鲁单981的综合抗性较好,增产潜力较大,应大面积推广种植.     

Composition,Acidity and Rennet-coagulation Properties of Early- and Late-lactation Milks from Italian Friesian Cows

Veterinary Research Communications -     

A selective activity-dependent requirement for dynamin 1 in synaptic vesicle endocytosis

Dynamin 1 is a neuron-specific guanosine triphosphatase thought to be critically required for the fission reaction of synaptic vesicle endocytosis. Unexpectedly, mice lacking dynamin 1 were able to form functional synapses, even though their postnatal viability was limited. However, during spontaneous network activity, branched, tubular plasma membrane invaginations accumulated, capped by clathrin-coated pits, in synapses of dynamin 1-knockout mice. Synaptic vesicle endocytosis was severely impaired during strong exogenous stimulation but resumed efficiently when the stimulus was terminated. Thus, dynamin 1-independent mechanisms can support limited synaptic vesicle endocytosis, but dynamin 1 is needed during high levels of neuronal activity.     

The impact of maternal employment on breast-feeding duration in the UK Millennium Cohort Study

OBJECTIVE: To examine the relationship of maternal employment characteristics, day care arrangements and the type of maternity leave pay to breast-feeding for at least 4 months. DESIGN: Cohort study. SETTING: Babies aged 9 months in the Millennium Cohort Study, born between September 2000 and January 2002. SUBJECTS: A total of 6917 British/Irish white employed mothers with singleton babies. RESULTS: Mothers employed part-time or self-employed were more likely to breast-feed for at least 4 months than those employed full-time (adjusted rate ratio (aRR) and 95% confidence interval (CI) 1.30 (1.17-1.44) and 1.74 (1.46-2.07), respectively). The longer a mother delayed her return to work postpartum, the more likely she was to breast-feed for at least 4 months (P for trend < 0.001). Mothers were less likely to breast-feed for at least 4 months if they returned to work for financial reasons (aRR 0.86, 95% CI 0.80-0.93) or used informal day care arrangements rather than care by themselves or their partner (aRR 0.81, 95% CI 0.71-0.91). Mothers were more likely to breastfeed for at least 4 months if their employer offered family-friendly (aRR 1.14, 95% CI 1.02-1.27) or flexible work arrangements (aRR 1.24, 95% CI 1.00-1.55), or they received Statutory Maternity Pay (SMP) plus additional pay during their maternity leave rather than SMP alone (aRR 1.13, 95% CI 1.02-1.26). These findings were independent of confounding factors, such as socio-economic status and maternal education. CONCLUSIONS: Current policies may encourage mothers to enter or return to employment postpartum, but this may result in widening inequalities in breast-feeding and persistence of low rates. Policies should aim to increase financial support and incentives for employers to offer supportive work arrangements.     

太和县夏玉米新品种的产量性状和适应性分析

在大田条件下,研究了5个夏玉米新品种在太和县的产量性状和生态适应性。结果表明：安隆4号和鲁单981较对照郑单958植株高大,各生育时期叶面积指数较高,叶片的功能期较长,籽粒灌浆期较对照延长5～7d,单穗重增加56.0～76.8g,籽粒产量增加13.11～20.58%。安隆4号对玉米大、小叶斑病、锈病和螟虫等抗性优势明显;蠡玉16号和鲁单981适应性和抗病性较强,对玉米锈病具有显著抗性;中科11号轻感锈病,滑单986严重感染锈病,影响籽粒产量。因此,在太和县生态环境条件下,安隆4号和鲁单981的综合抗性较好,增产潜力较大,应大面积推广种植。     

张远超:陪练不是终点

走在北京体育大学的校园里,张远超和每一个普通的大学生没有什么两样,如果不是他说出来,你绝对想不到眼前这个男生是国家一级运动员。在同学的介绍下我开始的兼职陪练的工作。慢慢地陪练对象也开始给我介绍新的球友,慢慢地陪练工作已经可以给我带来一份稳定的收入。     

Clovis age Western Stemmed projectile points and human coprolites at the Paisley Caves

The Paisley Caves in Oregon record the oldest directly dated human remains (DNA) in the Western Hemisphere. More than 100 high-precision radiocarbon dates show that deposits containing artifacts and coprolites ranging in age from 12,450 to 2295 (14)C years ago are well stratified. Western Stemmed projectile points were recovered in deposits dated to 11,070 to 11,340 (14)C years ago, a time contemporaneous with or preceding the Clovis technology. There is no evidence of diagnostic Clovis technology at the site. These two distinct technologies were parallel developments, not the product of a unilinear technological evolution. "Blind testing" analysis of coprolites by an independent laboratory confirms the presence of human DNA in specimens of pre-Clovis age. The colonization of the Americas involved multiple technologically divergent, and possibly genetically divergent, founding groups.