LED点阵显示屏系统设计

介绍一种实用的LED点阵显示屏系统设计。利用pc机将汉字语句汉字内码转换为点阵显示数据，通过串行口送给显示屏。单片机完成显示处理。系统具有设计简单、成本低廉、可靠性高的特点。     

基因重组型枯草芽孢杆菌芽孢表面展示技术与应用

枯草芽孢杆菌是一种好氧型革兰氏阳性益生菌,在营养匮乏的环境下,可形成具有强抗逆性的芽孢。其芽孢独特的结构和生理功能使得芽孢表面展示技术相较于其他表面展示技术具有多种优势,构建的重组芽孢不但易纯化、回收率高,而且安全性好。近年来,枯草芽孢杆菌芽孢表面展示技术得到迅猛发展,已成功利用CotB、CotC、CotG、CotZ、CotA、OxdD、CotE、CotZ、CgeA等多种锚定蛋白将外源蛋白或多肽展示在芽孢表面,并应用于工业化酶、口服疫苗和药物、大分子量多聚体蛋白的生产以及环境污染的生物治理等领域。本文首先介绍了芽孢展示系统整合策略,并重点阐述了基因重组型枯草芽孢杆菌芽孢展示技术中涉及的锚定蛋白以及该技术在各领域的应用与展望。     

Observations on the behaviour of the Cape girdled lizard Cordylus cordylus (Reptilia: Cordylidae)

Cape girdled lizards Cordylus cordylus are social and territorial. Behaviour observed in captivity revealed at least 24 distinct postures and displays. Thermoregulatory behaviour was the most frequent of all behaviours observed (66·7%). Of the social behaviours, aggression was observed most frequently (72·1%). Six behavioural postures are not known to have been described before. This species has no bright colours or contrasting markings to use in displays to conspecifics.     

How Stomaphis aphids use their giant proboscides

To penetrate tree bark, arboreal aphids of the genus Stomaphis Walk. (Hemiptera: Aphididae: Lachninae) have proboscides up to three times their body length. Our observations of S. quercus (L.) complement a recent analysis of the anatomy and function of these mouthparts by clarifying how these relatively short-legged aphids move their proboscides between the resting position, pointing back, and the prognathous working position. The absence of crumenae in Stomaphis aphids and their feeding technique are discussed.     

Reproductive ecology of the glass frog Espadarana prosoblepon (Anura: Centrolenidae) in an urban forest of the Central Andes of Colombia

Population and reproductive behaviour aspects of the glass frog Espadarana prosoblepon are well known for populations from Central America, but similar information is lacking for populations from South America. We recorded the reproductive ecology of a population of the glass frog E. prosoblepon in the city of Armenia, Central Andes of Colombia. With weekly surveys with mark-recapture between December 2013 and November 2015, we monitored activity patterns and evaluated if the probability of males mating is associated to their body size or to chorus tenure (i.e. the number of nights a same individual is calling for attracting a mate). In addition, upon observing an amplexus, we recorded the behaviour of the individuals until oviposition and noted characteristics of egg clutch. We recorded 47 males and 32 females, nine amplexus events, eight ovipositions, and 21 egg clutches (35.4 ± 4.79 eggs per clutch, N = 29). Activity of males and females and the number of egg clutches were positively correlated to rainfall. Mating success of males was not associated to their body size, but it was positively associated to longer chorus tenure; clutches from large females had a higher number of eggs than clutches from small females. Oviposition occurred on average 3.76 ± 1.74 hours after we first observed the amplexus, occurring 93.1% of the time in fronds of Selaginella geniculata at an average height of 1.58 ± 0.44 m. After the oviposition, the male left the site, while the female remained between 30 and 45 min, partially covering the eggs. The reproductive behaviour of E. prosoblepon did not vary widely between a population in Costa Rica and our population in time to oviposition, and mating success of males associated to chorus tenure; however, in our study population we recorded a larger clutch size and the preference for S. geniculata fronds as oviposition substrate.     

Two nesting behaviours and life history of a subsocial African dungrolling beetle,Scarabaeus catenatus (Coleoptera: Scarabaeidae)

Nesting behaviour of a large-sized dung beetle, Scarabaeus catenatus (Gerstaecker), was observed at the Tsavo West National Park, south-eastern Kenya. Although this species is taxonomically a member of a dung-roller group (that is, subfamily Scarabaeinae), it had not only a rolling behaviour but also a tunneller behaviour for nesting. In the former case, the scarab rolled a chunk or a ball of dung some distance (0·5–15·5m) away from the dung pat and buried it under the ground. In the latter case, it dug a tunnel near the dung pat (0–1 m) and transported several pieces of dung into the burrow. In both cases, brood nests were completed by a female alone or by male-female co-operation. Four days after dung burial, the female made one to four brood balls out of buried dung, in each of which she deposited an egg. On the other hand, the male left the nest soon after the female completed oviposition. Even after oviposition, the female stayed in the nest and cared for her progeny until they emerged. This indicates that S. catenatus is subsocial. A major source of offspring mortality was likely to be predation by driver ants (Dorylus sp.). Most females seemed to breed one time in each of two or more successive rainy seasons.     

Baronia brevicornis caterpillars build shelters to avoid predation

In at least 18 Lepidoptera families, caterpillars build shelters that mainly serve to regulate microclimate (humidity, temperature) and/or to avoid predation. We aimed to explore the function of the tubular structures built with the leaves of the host plant, Acacia cochliacantha Humboldt and Bonpland ex Willdenow (Fabaceae), by a lepidopteran endemic to Mexico, Baronia brevicornis Salvin. We experimentally evaluated whether tubular structure building behaviour is induced by high temperature or predator odour, and if shelters reduce or enhance predation of B. brevicornis caterpillars. We used Calosoma angulatum as predator. Our analyses showed that caterpillars did not make the tubular structures in response to high temperature. We also found no difference in predators’ visual recognition of sheltered versus unsheltered caterpillars. Caterpillars did not build shelters but they moved more often when exposed to predator odour. Unsheltered caterpillars were more frequently consumed when predators were allowed to interact with sheltered and unsheltered caterpillars. Hence, the tubular structures built by B. brevicornis are most likely a strategy for reducing predation, for example by C. angulatum.     

Theoretical Studies of Thermodynamic Properties of Clusters

正As an extension of our earlier study on the structural properties of the clusters,a recently developed method to calculate the low-temperature vibrational heat capacities of clusters shall be presented.Subsequently,it shall be applied to Aun,Nan,Sin,Gen,and SinGen clusters.Our approach does not attempt to identify phase transitions but focuses on the low temperature behaviour,we find that the vibrational heat capacity of the clusters is strongly     

Notes on the natural history of Stizus perrisii ibericus Beaumont (Hymenoptera: Sphecidae)

A study of the biology of Stizus perrisii ibericus revealed some aspects about the behaviour of males, the nesting behaviour of females, and larval development. The slow mass provisioning of this species is compared with the provisioning behaviour of S. continuus and S. pulcherrimus. Cocoons are constructed in seven stages although, compared with other species, there are differences in the duration of each stage. Natural enemies of the wasp include miltogrammine flies, several cuckoo wasps, and velvet ants.