中国凸眼赤螨属两新种（蜱螨亚纲：赤螨科）

记述赤螨科凸眼赤螨属2新种,中华凸眼赤螨Neophanolophus chinensis sp.nov,和刘氏凸眼赤螨Neophanolophus liui sp.nov。新种标本用马氏网自湖南省石门县壶瓶山自然保护区采集得到;新种之间以及新种与已知种的区别可由文中分种检索表检索。属名中文由作者根据其眼向外凸之特征自拟。     

中国开依丽赤螨属—新种记述（蜱螨亚纲：赤螨科）

记述赤螨科开依丽赤螨属一新种。湖南开依丽赤螨新种Caeculisoma hunanica sp.nov.,新种与该属已知种幼螨的区别可由中检索表查得。新种标本用马氏网采自湖南石门过壶瓶山自然保护区。     

中国开依丽赤螨属一新种记述 (蜱螨亚纲 :赤螨科 )(英文)

记述赤螨科开依丽赤螨属一新种。湖南开依丽赤螨新种Caeculisomahunanicasp .nov .,新种与该属已知种幼螨的区别可由文中检索表查得。新种标本用马氏网采自湖南石门壶瓶山自然保护区     

中国凸眼赤螨属两新种记述(蜱螨亚纲:赤螨科)

记述赤螨科凸眼赤螨属2新种.中华凸眼赤螨Neophanolophus chinensis sp. nov.和刘氏凸眼赤螨Neo-phanolophus liui sp. nov. .新种标本用马氏网自湖南省石门县壶瓶山自然保护区采集得到.新种之间以及新种与已知种的区别可由文中分种检索表检索.属名中文名由作者根据其眼向外凸之特征自拟.     

中国赤螨两新种（蜱螨亚纲：赤螨科）

醉语言忆述赤螨科２属２新种。朱亭纤赤螨Ｌｅｐｔｕｓ ｚｈｕｉｎｇｅｎｓｉｓ ｓｐ．ｎｏｖ．,外寄生于刺股钩臂叶甲和一种蝉,新种与Ｌ．ｄｒａｃｏ Ｓｏｕｔｈｃｏｔｔ近似,前感毛基部位于骨化程度较低之盾片上,但新种Ｖｓ刚毛位于足Ⅱ膝节上,而不象Ｌ．ｄｒａｃｏ位于足Ｉ膝节上,新种须肢股节上刚毛为披针形,而Ｌ．ｄｒａｃｏ为棒状,以资区别。湖南查丽赤螨Ｃｈａｒｌｅｔｏｎｉａ ｈｕｎａｎｅｎｓｉｓ ｓｐ．ｎｏ     

外寄生于叶蜂成虫的纤赤螨属一新种记述(蜱螨亚纲,赤螨科)

记述赤螨科纤赤螨属1新种,浙江纤赤螨Leptus zhejiangensis sp.nov。新种标本叮附在凶猛侧跗叶蜂Siobla ferox(Smith)（膜翅目：叶蜂科）成虫虫体上。     

中国巨刺螨属一新种和雷氏巨刺螨的重新描述(中气门目,巨刺螨科)(英文)

记述了采自广西的扁颅蝠Tylonycteris robustula(Thomas,1915)体表的寄生革螨1新种:拟雷氏巨刺螨Macronyssus pararadovskyi Tian,Jin et Zhang,sp.nov..新种与雷氏巨刺螨Macronyssus radovskyi(Domrow,1963)近似,二者的区别在于:新种背毛有27对,具有Z3;雌螨生殖腹板具有3根副毛,或部分标本为1根副毛在板的末端,另1对副毛位于板外;雄螨胸生殖腹板上具有4对胸毛和20根腹毛.而雷氏巨刺螨背毛有26对,不具有Z3.雌螨生殖腹板不具有副毛,即副毛均不在生殖腹板上;雄螨胸生殖腹板上具有4对胸毛和18根腹毛.另外,依据采自广西褐扁颅蝠Tylonycterispachypus(Temminck,1840)体表的标本,对雷氏巨刺螨Macronyssus radovskyi(Domrow,1963)的雌、雄螨成体和第1若螨进行了重新描述.所有标本均保存于贵州大学昆虫研究所标本馆.     

云南叶螨属二新种记述(蜱螨目:叶螨科)

在鉴定云南叶螨标本时,发现叶螨属二新种,兹记述如下。模式标本保存于上海农学院。(文内量度单位均为微米)。 野葵叶螨Tetranychus malvae新种(图1—7) 雌螨 体长(包括喙)556,体宽344。体椭圆形,红色。 须肢端感器圆柱形,长6.2,宽4.2。背感器棒形,长6.7。两刺状毛长度约等,为8.5。口针鞘前端圆钝。气门沟U形弯曲。 背表皮纹纤细,在第三对背中毛间和内骶毛间为纵向,形成菱形纹。背毛12对(缺臀毛),刚毛状,具细茸毛,不着生在结节上。背毛长于横列间距。背毛长度如下:第1—3     

革螨一新属新种及一新科的建立(蜱螨亚纲:革螨股)

在云南陇川县的蜣螂体上采得一种革螨系未曾描述过的新种,并为之建立新科与新属,用其颚角呈球形膨大及躯体角化较深的特征命名。球革螨科新科Bulbogamasidae fam.nov.的主要特征:叉毛三叉,其侧具一拇指状薄膜;颚角呈球形膨大,角化弱;头盖前缘光滑;雄螨足11具强大的距状表皮突。球革螨属新属Bulbogamasus gen.nov.的主要特征:背板整块;背毛26对,板周围的长大,中部的细小;胸叉叉丝末端具刺状突,小分支端部有的分叉;雌螨具腹肛板与肛前毛;雄螨导精趾粗长,超过螯钳长的2倍以上。模式种为中华球革螨新种Bulbogamasus sinicus sp.nov.     

中国蚌螨属水螨一新种记述(蜱螨亚纲,蚌螨科)

记述了从我国江西省淡水蚌中采到的蚌螨科Unioncolidae水螨1新种,簇刺蚌螨U.(Anodontinatax)penicillatus sp.nov.,模式标本保存于南昌大学生物科学工程系.簇刺蚌螨,新种Unionicola(Anodontinatax)penicillatus sp.nov.(图1～11)正模♂,副模1♀,江西鄱阳湖,1998-11-11,文春根采自背角无齿蚌A.woodiana woodiana(Lea).鉴别特征新种近似于中间蚌螨U.(Anodontinatax)intermedia(Koenike,1882),但通过以下特征区别后者:雄螨具有背小板,雄螨Ⅳ-L-4-5的密刺毛数量为8～10和22～24(后者为18～20和17～19),射精复合体的形状和须肢的分叉腹小爪.词源:拉丁词"penicillatus"意思为"一簇毛的",指新种因雄螨Ⅳ-L-4-5有一簇刺毛而命名.     

Detecting mycotoxins in agricultural commodities

It is difficult to obtain precise and accurate estimates of the true mycotoxin concentration of a bulk lot when using a mycotoxin-sampling plan that measures the concentration in a small portion of the bulk lot. A mycotoxin-sampling plan is defined by a mycotoxin test procedure and a defined accept/reject limit. A mycotoxin test procedure is a complicated process and generally consists of several steps: (a) a sample is taken from the lot, (b) the sample is ground (comminuted) in a mill to reduce particle size, (c) a subsample is removed from the comminuted sample, and (d) the mycotoxin is extracted from the comminuted subsample and quantified. Even when using accepted test procedures, there is variability associated with each step of the mycotoxin test procedure. Because of this variability, the true mycotoxin concentration in the lot cannot be determined with 100% certainty by measuring the mycotoxin concentration in a sample taken from the lot. The variability for each step of the mycotoxin test procedure, as measured by the variance statistic, is shown to increase with mycotoxin concentration. Sampling is usually the largest source of variability associated with the mycotoxin test procedure. Sampling variability is large because a small percentage of kernels are contaminated and the level of contamination on a single seed can be very large. Methods to reduce sampling, sample preparation, and analytical variability are discussed.     

A moral argument for frozen human embryo adoption

Some people (e.g., Drs. Paul and Susan Lim) and, with them, organizations (e.g., the National Embryo Donation Center) believe that, morally speaking, the death of a frozen human embryo is a very bad thing. With such people and organizations in mind, the question to be addressed here is as follows: if one believes that the death of a frozen embryo is a very bad thing, ought, morally speaking, one prevent the death of at least one frozen embryo via embryo adoption? By way of a three-premise argument, one of which is a moral principle first introduced by Peter Singer, my answer to this question is: at least some of those who believe this ought to. (Just who the “some” are is identified in the paper.) If this is correct, then, for said people, preventing the death of a frozen embryo via embryo adoption is not a morally neutral matter; it is, instead, a morally laden one. Specifically, their intentional refusal to prevent the death of a frozen embryo via embryo adoption is, at a minimum, morally criticizable and, arguably, morally forbidden. Either way, it is, to one extent or another, a moral failing.     

Optimal seasonal timing of univoltine and bivoltine insects

This study examines the optimal seasonal timing of the life cycle for univoltine and bivoltine insects, assuming that resource availability has a peak in the middle of a year and is symmetric around it. Results show that if the growth rate increases in proporrion to the bodyweight, bivoltine life cannot be optimal. If the growth rate is a power function of the bodyweight with a power smaller than unity, a symmetric bivoltine solution can be the optimal provided that the resource availability has a plateau in the middle of the season. If the resource availability has a sharp peak, the optimal pattern is an asymmetric bivoltine solution in which the larval periods of two generations differ in length. The bivoltine life cycle is more likely to be superior to the univoltine one if: growth is fast, suitable growing season is long, biomass loss during nonlarval stages is small, and egg size is small.     

Lectin affinity electrophoresis

Lectin affinity electrophoresis is a powerful technique to investigate the interaction between a lectin and its ligand. Affinity electrophoresis results from the reduced mobility of a charged species owing to its interaction with an immobile species. In this protocol, a two-dimensional lectin affinity electrophoresis experiment is described that affords separation of oligosaccharides. The first-dimension is composed of a weak, polyacrylamide, capillary tube gel containing a lectin. The example described involves a mixture of fluorescently labeled disaccharides. The mobility of only the lectin-binding disaccharide is reduced affording a separation in the first-dimension. The tube gel is then extruded and placed onto the second-dimension gradient polyacrylamide gel and subjected to electrophoresis. Mobility in the second-dimension is dependent on molecular size and visualization is by fluorescence under transillumination. This method is also applicable, with appropriate modifications, for the separation and analysis of glycopeptides and glycoproteins.     

The dynamics of two viral infections in a single host population with applications to hantavirus

An SI epidemic model for a host with two viral infections circulating within the population is developed, analyzed, and numerically simulated. The model is a system of four differential equations which includes a state for susceptible individuals, two states for individuals infected with a single virus, one which is vertically transmitted and the other which is horizontally transmitted, and a fourth state for individuals infected with both viruses. A general growth function with density-dependent mortality is assumed. A special case of this model, where there is no coinfection and total cross immunity, is thoroughly analyzed. Several threshold values are defined which determine establishment of the disease and persistence at equilibrium for one or both of the infections within the host population. The model has applications to a hantavirus and an arenavirus that infect cotton rats. The hantavirus is transmitted horizontally whereas the arenavirus is transmitted vertically. It is shown through analysis and numerical simulations that both diseases can be maintained within a single host population, where individuals can be either infected with both viruses or with a single virus.     

A graph theoretic approach to the development of minimal phylogenetic trees

Summary The problem of determining the minimal phylogenetic tree is discussed in relation to graph theory. It is shown that this problem is an example of the Steiner problem in graphs which is to connect a set of points by a minimal length network where new points can be added. There is no reported method of solving realistically-sized Steiner problems in reasonable computing time. A heuristic method of approaching the phylogenetic problem is presented, together with a worked example with 7 mammalian cytochrome c sequences. It is shown in this case that the method develops a phylogenetic tree that has the smallest possible number of amino acid replacements. The potential and limitations of the method are discussed. It is stressed that objective methods must be used for comparing different trees. In particular it should be determined how close a given tree is to a mathematically determined lower bound. A theorem is proved which is used to establish a lower bound on the length of any tree and if a tree is found with a length equal to the lower bound, then no shorter tree can exist.     

Multifaceted functions of RPS27a: An unconventional ribosomal protein

The ribosomal protein S27a (RPS27a) is cleaved from the fusion protein ubiquitin–RPS27a (Ub–RPS27a). Generally, Ub and RPS27a are coexpressed as a fusion protein but function independently after Ub is cleaved from RPS27a by a deubiquitinating enzyme. As an RP, RPS27a assembles into ribosomes, but it also functions independently of ribosomes. RPS27a is involved in the development and poor prognosis of various cancers, such as colorectal cancer, liver cancer, chronic myeloid leukemia, and renal carcinoma, and is associated with poor prognosis. Notably, the murine double minute 2/P53 axis is a major pathway through which RPS27a regulates cancer development. Moreover, RPS27a maintains sperm motility, regulates winged aphid indirect flight muscle degeneration, and facilitates plant growth. Additionally, RPS27a is a metalloprotein and mercury (Hg) biomarker. In the present review, we described the origin, structure, and biological functions of RPS27a.     

A new measure for upright stability

The control of balance is a primary objective in most human movements. In many cases, research or practice, it is essential to quantitatively know how good the balance is at a body posture or at every moment during a task. In this paper we suggest a new measure for postural upright stability which assigns a value to a body state based on the probability of avoiding a fall initiation from that state. The balance recovery problem is solved for a population sample using a strength database, and the probability of successfully maintaining the balance is found over the population and called the probability of recovery (PoR). It, therefore, describes an attribute of a body state: how possible the control of balance is, or how safe being at that state is. We also show the PoR calculated for a 3-link body model for all states on a plane, compare it to that found using a 2-link model, and compare it to a conventional metric: the margin of stability (MoS). It is shown, for example, that MoS may be very low at a state from which most of the people will be able to easily control their balance.     

Does a dose-response relationship reduce sensitivity to hidden bias?

It is often said that an important consideration in judging whether an association between treatment and response is causal is the presence or absence of a dose-response relationship, that is, larger ostensible treatment effects when doses of treatment are larger. This criterion is widely discussed in textbooks and is often mentioned in empirical papers. At the same time, it is well known through both important examples and elementary theory that a treatment may cause dramatic effects with no dose-response relationship, and hidden biases may produce a dose-response relationship when the treatment is without effect. What does a dose-response relationship say about causality? It is observed here that a dose-response relationship may or may not reduce sensitivity to hidden bias, and whether it has or has not can be determined by a suitable analysis using the data at hand. Moreover, a study without a dose-response relationship may or may not be less sensitive to hidden bias than another study with such a relationship, and this, too, can be determined from the data at hand. An example concerning cytogenetic damage among professional painters is used to illustrate.