黑脸噪鹛生活习性及捕食松毛虫的作用

黑脸噪鹛属林栖性鸟类,营巢于枝叶浓密的杉、松等树冠内或灌丛中。每年一般繁殖一次,每窝产卵3—5枚。孵壳期17—18天,哺雏期19—20天,幼鸟出窝率35.6—44.5％。为多种森林害虫的重要天敌,据在笼内进行分捕食量测定,每只鸟平均每小时对马尾松毛虫1龄、3龄、6龄幼虫的捕食量别为976条、93.1条和5.4条。

丝弦锣鼓:流淌在乡间的绝唱

八百里清江自西向东横穿建始县境内。这里"万山稠叠、突兀恢奇","自古为楚蜀咽喉"。世世代代生活在这里的汉、土家、苗等各族劳动人民,在顽强乐观地生存和达观艰难地繁衍的同时,创造了极其丰富多彩、璀璨斑斓的民间艺术。而植根于建始本土并流行于建始周边县市的"建始丝弦锣鼓"是这些奇艳山花中最为夺目的一朵。

流产的扶持项目

生研会免费为吉沙村开展生态旅游发展项目,旨在保护当地特有的生态环境、提高村民的生计水平与村庄的可持续发展。生研会的项目与当地实际和当前时代发展要求相符,应予以肯定。在当前脱贫攻坚战如火如荼进行的背景下,其项目运行失败的教训值得警惕。吉沙村位于云南省香格里拉县,它由上吉沙和下吉沙两个自然村组成。吉沙村附近的千湖山风景秀丽,山上有美丽的原始森林和湖泊。

农时七绝五律诗词(五)

梅子黄时芒种边，忙收麦类赶插田。花神已乘薰风去，点化枇杷如蜜甜。

建立基督化家庭

圣经十分重视婚姻和家庭,因为婚姻是神所发起和设立的。古人称为“天作之合”和“天定姻缘”等等。 1994年被联合国定为“国际家庭年”。据我知道,在海外的华人教会也都在呼唤和提倡“

Prediction of crack location and propagation in stretch flanging process of aluminum alloy AA-5052 sheet using FEM simulation

The stretch flanging process is significantly affected by various geometrical,material and process parameters.The punch-die clearance and initial flange length are main parameters which have major effects on the edge crack location and strain distribution along die profile radius in the flange.Non-axisymmetric stretch flanging process of AA-5052 sheet metal blanks was carried out by numerical simulation to predict the deformation behavior of flange,location and propagation of crack in flange and to investigate the effect of punch die clearance,flange length,die and punch profile radius and friction in the stretch flanging process.The experimental investigations were made to validate the simulations results.The results reveal that the crack length increases with the increase in the flange length.It is found that the flange length has a significant effect in circumferential direction as compared with the radial direction.The punch die clearance has the most significant effect in crack propagation in comparison with flange length.The circumferential strain is found to be larger in the case of punch having the profile radius less than the die profile radius,which leads to faster edge crack propagation.A close agreement is found between simulation and experimental results in terms of location of edge crack and forming load.

Carbon Stock of Larch Plantations and Its Comparison with an Old-growth Forest in Northeast China

The overall goal of this study was to understand carbon(C) stock dynamics in four different-aged Japanese larch(Larix kaempferi) plantations in Northeast China that were established after clear-cutting old-growth Korean pine deciduous forests. Four Japanese larch plantations which were at 10, 15, 21, and 35 years old and an old-growth Korean pine deciduous forest which was 300 years old in Northeast China were selected and sampled. We compared the C pools of biomass(tree, shrub and herb), litterfall(LF), and soil organic carbon(SOC) among them. The biomass C stock of larch plantation at 10, 15, 21, and 35 years old was 26.8, 37.9, 63.6, and 83.2 Mg/ha, respectively, while the biomass C stock of the old-growth Korean pine deciduous forest was 175.1 Mg/ha. The SOC stock of these larch plantations was 172.1, 169.7, 140.3, and 136.2 Mg/ha respectively, and SOC stock of 170.4 Mg/ha in the control of old-growth forest. The biomass C stock increased with stand age of larch plantations, whereas SOC stock decreased with age, and C stock of LF did not change significantly(P > 0.05). The increase of biomass C offset the decline of SOC stock with age, making total carbon stock(TCS) of larch plantations stable from stand ages of 10–35 years. The TCS in larch plantations was much smaller than that in the old-growth forest, suggesting that the conversion of old-growth forests to young larch plantations releases substantial C into the atmosphere.

Snapshots of a Viral RNA Polymerase Switching Gears from Transcription Initiation to Elongation

During transcription initiation,RNA polymerase binds tightly to the promoter DNA defining the start of transcription,transcribes comparatively slowly,and frequently releases short transcripts(3-8 nucleotides)in a process called abortive cycling.Transitioning to elongation,the second phase of transcription,the polymerase dissociates from the promoter while RNA synthesis continues.Elongation is characterized by higher rates of transcription and tight binding to the RNA transcript.The RNA polymerase from enterophage T7 (T7 RNAP) has been used as a model to understand the mechanism of transcription in general,and the transition from initiation to elongation specifically.This single-subunit enzyme undergoes dramatic conformational changes during this transition to support the changing requirements of nucleic acid interactions while continuously maintaining polymerase function.Crystal structures,available of multiple stages of the initiation complex and of the elongation complex,combined with biochemical and biophysical data,offer molecular detail of the transition.Some of the crystal structures contain a variant of T7 RNAP where proline 266 is substituted by leucine.This variant shows less abortive products and altered timing of transition,and is a valuable tool to study these processes.The structural transitions from early to late initiation are well understood and are consistent with solution data.The timing of events and the structural intermediates in the transition from late initiation to elongation are less well understood,but the available data allows one to formulate testable models of the transition to guide further research.

Inhomogeneous trends in the onset date of extreme hot days in China over the last five decades

Using a homogenized daily maximum temperature(T_(max))dataset across China,this study characterized the spatiotemporal variation of the onset date of extreme hot days in a year(i.e.,FirstEHD)during 1960-2018.Inhomogeneous trends of FirstEHD over China during 1960-2018 can be found,with the advanced trend of FirstEHD over most parts in China,while a number of stations in North-Central China(NC)show the delayed trend of FirstEHD.Moreover,there exist interdecadal changes of FirstEHD trend,with a remarkable difference in the trend magnitude before and after the 1990s over South China(SC),and the sign of trend can even reverse from negative to positive after the 1990s in Xinjiang(XJ)and Yangtze River Basin(YR),and from positive to negative in NC.The overall trends of FirstEHD over NC,YR,and XJ during 1960-2018 are dominated by the trends before the 1990s,while they are dominated by the sharp advance after the 1990s over SC.It is further found that the trend of FirstEHD can generally be explained by the long-term trend in T_(max) over most parts of China,but the contribution from T_(max) variabilities is also non-negligible and can even account for more than 75% of the overall trend over NC.The possible factors responsible for the decadal changes in FirstEHD trends are also discussed.

Identification of Taxus cuspidata Sieb.et Zucc endophytic fungi─ new recorded-genus-species of China and the metabolite

A total of 94 isolates of endophytic fungi were isolated from the bark of 200-yr.-old Taxus cuspidata Sieb. et Zucc. in the primeval forest of the Changbai Mountain Natural Reserve, and 19 species of endophytic fungi were identified. Among the taxa 2 new species and 1 new varied species as well as the 6 known species of China had been described in a previous article published on Journal of Forestry Research, Vol. 14 (4): 290-294 (2003). This paper made a detail description on the morpho-logical characteristics of the 9 new recorded-genus-species and 1 new record species with illustrations, including Staphy-lotrichum coccosporum Meyer et Nicot, Botryodema lateritium Papendoorf & Upadhyay, Oedocephalum glomerulosum (Rul-liard) Sacc., Trichosporonoides oedocephalis Haskins & Spencer, Beniowskia sphaeroidea (Kal Chbrenner et Caeke) Mason, Thermomyces verrucosus Pugh, Blakeman & Morgan-jones, Gilmaniella humicola Brron , Arthrinium sphaerosperma (Per.:Fr.) Ellis, Ambrosiella brunnea (Verrall) Batra, and Cytosporina notha Diedz (1 new record species). And the habitats, hosts, distribu-tions and fruiting periods were recorded for the new recorded-genus-species. The determination result of thin layer chroma-tography (TLC) showed that the liquid fermentation metabolites of the strains could not react positively with taxoids developer - the vanillic aldehyde and dilute bismuth potassium iodide.

Ma Yun’s Internet World

AS the founder and chairman of Alibaba Group,every one of Ma Yun’s business decisions attracts attention.From spending RMB 1.2 billion on stakes in the Guangzhou Evergrande Football Club to wholly acquiring UCWeb,and to making the Initial Public Offering(IPO)in the U.S.,Ma Yun continues to make headlines with many fingers in many pies。

Implications of Urban Growth on Domestic Water Consumption： A Case Study of Jorhat Town, India

This paper tries to embraces the urban growth in Jorhat town and its implications on water consumption at household＇s level. Urban growth is measured through the increase in the number of population and the aerial extent. It is a pathetic situation for Jorhat residents in case of domestic water consumption that due to rapid increase of population in the town, the existing water supply systems cannot cope with the current demand. So, the people of the town always struggle to collect water from other sources such as River Bhogdoi, ponds, dug well, water vendor etc., moreover, try to satisfy the limited daily household needs. The methodology adopted in this paper is involved on both primary and secondary data. The primary data has been collected through household survey pertains to 600 households from each of 19 municipal wards in Jorhat town in both pre and post monsoon seasons. To highlight the growth of population and population projection, the compound rate of growth method has been used and it is tried to link with the future water demand in Jorhat town,

长牙前后的护牙提醒

通常宝宝到了6个月左右,就开始长牙了。虽然乳牙是要换掉的,但不能小看它,要是它不健康,会影响以后宝宝恒牙的健康和美观。所以,乳牙萌出的前后,要小心护理。出牙前,帮他缓解不适宝宝快出牙时,经常两腮发红,爱流口水,有时表现出烦躁、疲惫的样子。有的宝宝还会发低烧,但通常不会超过38℃。

宝宝“长牙”的时候,爸爸妈妈该做些什么?

当妈妈看到宝宝悄悄长出第一颗牙齿的时候,心中的喜悦不言而喻,然而,喜悦之余,可别忘了宝宝已经来到人生一个重要的阶段:长牙期。长牙期摄入营养的多少、食物种类的改变,对宝宝的生长发育可能会有一生的影响,每个妈妈都要用心对待,利其尔教您如何做好准备。为宝宝准备一些磨牙牙胶宝宝开始长牙的时候会咬手指、玩具、衣被,适当使用牙胶非常必要,父母可以为宝宝准备一些磨牙牙胶。一些特制的磨牙牙胶对出牙期的宝宝很适宜。

从军路上我和你

2012年8月3日是一个特别难忘的日子。这天我离开家乡,正式踏上从军之路。夜色下闪耀在车站广场上的红辣椒至今难忘。我在心里默默地念道：＂以后很少能吃到这纯正的味道了。＂独自坐在火车上,我默默看着月台上来去匆匆的旅客,静静地想着和你一起走过的日子。你说要来送我,我没有同意,因为我不忍和你当面话别,更不忍离开这座和你有着共同记忆的城市。我还是给你打了电话。

南通纪念反清乡斗争胜利七十周年

从1943年4月开始,侵华日军为了实现其"以战养战、以华制华"的阴谋,对我苏中四分区实施了清乡,直到1944年10月反清乡斗争取得彻底胜利,南通人民在中国共产党的领导下,同侵华日军展开了殊死斗争,粉碎了敌人企图伪化苏中四分区的阴谋。10月16日上午,南通市隆重召开纪念苏中四分区反清乡斗争胜利70周年座谈会。市委书记。

猎狐高手就是它 杰克罗素■

杰克罗素■是一种活泼、精力旺盛、爱好群集的工作犬种。这种■犬是由杰克·罗素牧师培养出来的,并由此得名。它们敏捷的动作、狭小而柔软的胸部十分有利于其在地面上和地下捕捉欧洲红狐狸,因此成为■犬界著名的猎狐高手。但这并不意味着所有人都适合做它的主人,因为这个毛小孩有点难搞,你真的需要有些＂育儿经验＂才能搞定它们。

绿豆芽

9月23日星期五晴今天,我找来了几颗绿豆。只见绿豆全身包着翠绿色的外衣,表皮十分坚硬。我想这是它保护自己的一种方法吧。这么坚硬的种子,即使从楼上摔下去。