scholarly journals On the anatomical and optical structure of the crystalline lenses of animals, being the continuation of the paper published in the Philosophical Transactions for 1833

The author has examined the structure of the crystalline lens of the eye of a great variety of animals belonging to each of the four classes of Vertebrata; and has communicated in this paper a detailed account of his observations, arranged according as they relate to structures more and more complex. In a former paper, published in the Philosophical Transactions for 1833, the lens of the Cod fish was taken as the type of the simplest of these structures, in as much as all the fibres of which it is composed converge, like the meridians of a globe, to two opposite points, or poles, of a spheroid or lenticular solid; both of which poles are situated in the axis of vision. The structure which ranks next in respect of simplicity is that exhibited in the Salmon, among fishes; in the Gecko, among reptiles; and in the Hare, among Mammalia. It presents at each pole two septa placed in one continuous line, in different points of which all the fibres proceeding from the one surface to the other have their origin and termination. A structure somewhat more complex is met with in the lenses of most of the Mammalia, and is particularly exemplified in the lion, the tiger, the horse, and the ox. Three septa occur at each pole in the form of diverging lines inclined to one another at angles of 120°. The next degree of complexity is presented in the lens of the whale, the seal, and the bear, which contain, instead of three, four septa on each side, placed at right angles to each other in the form of a cross. In some specimens of lenses of whales and seals the author observed two septa from each pole, forming one continuous line, from each of the extremities of which proceeded two others, which were at right angles relatively to one another : so that there were in all five on each surface. The most complex structure is that of the lens of the elephant, which exhibits three primary septa diverging at equal angles from the pole, and at their extremities bifurcating into two additional septa, which are inclined to each other at angles of 60°, these latter being the real septa, to which the fibrous radiations are principally related. In some lenses of the elephant the author found the three septa immediately proceeding from the poles exceedingly short, and approaching to evanescence ; so that he has no doubt that occasionally they may be found to have disappeared, and that the other six septa will then all diverge from the poles, like the radii ot a hexagon, at angles of 60°. In all the preceding cases, where the arrangement of the fibres is symmetrical on the two sides, the septa on the opposite surface of the lens occupy positions which are reversed with respect to one another; thus in the simple case of the double septa at each pole, the line formed by those of the posterior surface is situated at right angles to that formed by the septa of the anterior surface. Where there are three divergent septa at each pole, the direction of those on the one side bisect the angles formed by those on the other side; and again, where the septa form a rectangular cross, those of one surface are inclined 45° to those of the other surface.

2018 ◽  
pp. 13-38
Author(s):  
N. Ceramella

The article considers two versions of D. H. Lawrence’s essay The Theatre: the one which appeared in the English Review in September 1913 and the other one which Lawrence published in his first travel book Twilight in Italy (1916). The latter, considerably revised and expanded, contains a number of new observations and gives a more detailed account of Lawrence’s ideas.Lawrence brings to life the atmosphere inside and outside the theatre in Gargnano, presenting vividly the social structure of this small northern Italian town. He depicts the theatre as a multi-storey stage, combining the interpretation of the plays by Shakespeare, D’Annunzio and Ibsen with psychological portraits of the actors and a presentation of the spectators and their responses to the plays as distinct social groups.Lawrence’s views on the theatre are contextualised by his insights into cinema and its growing popularity.What makes this research original is the fact that it offers a new perspective, aiming to illustrate the social situation inside and outside the theatre whichLawrenceobserved. The author uses the material that has never been published or discussed before such as the handwritten lists of box-holders in Gargnano Theatre, which was offered to Lawrence and his wife Frieda by Mr. Pietro Comboni, and the photographs of the box-panels that decorated the theatre inLawrence’s time.


This chapter considers how, once again, the Venetians had found themselves under steady pressure from two sides — this time between the new king of France, Francis I, and Charles of Habsburg, the king of Spain as well as the Holy Roman Emperor. Although they had not come to a clear rupture with the Emperor, the Venetians had dutifully performed their role in the war on the French side, and were now rather at sea as to what they should do next. On the one hand, Francis incited them to hold on, for he would soon send another army into Italy; on the other hand, Charles was trying to detach them from the French alliance with various reassurances and offers.


2013 ◽  
Vol 2013 ◽  
pp. 1-16 ◽  
Author(s):  
Silja Raschke ◽  
Jürgen Eckel

This review summarizes the current literature regarding the most discussed contraction-regulated moykines like IL-6, IL-15, irisin, BDNF, ANGPTL4, FGF21, myonectin and MCP-1. It is suggested that the term myokine is restricted to proteins secreted from skeletal muscle cells, excluding proteins that are secreted by other cell types in skeletal muscle tissue and excluding proteins which are only described on the mRNA level. Interestingly, many of the contraction-regulated myokines described in the literature are additionally known to be secreted by adipocytes. We termed these proteins adipo-myokines. Within this review, we try to elaborate on the question why pro-inflammatory adipokines on the one hand are upregulated in the obese state, and have beneficial effects after exercise on the other hand. Both, adipokines and myokines do have autocrine effects within their corresponding tissues. In addition, they are involved in an endocrine crosstalk with other tissues. Depending on the extent and the kinetics of adipo-myokines in serum, these molecules seem to have a beneficial or an adverse effect on the target tissue.


1869 ◽  
Vol 17 ◽  
pp. 308-309

At present we are acquainted with two amylic alcohols formed by fermentation. They were discovered by Pasteur, who observed that different specimens of amylic alcohol caused a ray of polarized light to rotate to dif­ferent degrees. He succeeded in devising a separation of these alcohols, which consisted in converting them into sulphamylates of barium and re­crystallizing these salts. The one alcohol is without action on polarized light, and the other rotates it. This method of separation is beset with great practical difficulties, and has, we believe, only once been repeated, viz. by Mr. Pedler. He gives no detailed account of the separation, but gives some of the leading properties of the alcohols. He found that the rotating alcohol caused a ray of polarized light to rotate 17° with a column of 500 millims. of liquid. The following are some examples of the rotations effected by eleven different samples of amylic alcohol in a column of 385 millims. For compa­rison with Pedler’s number, the observed numbers have been reduced in the second column to observations on 500 millims.


2018 ◽  
Vol 140 (11) ◽  
Author(s):  
Peyman Davvalo Khongar ◽  
Jan Oscar Pralits ◽  
Paolo Soleri ◽  
Mario Romano ◽  
Rodolfo Repetto

Iris-fixated aphakic intraocular lenses (IFIOL) are used in cataract surgery when more common intraocular lenses (IOL) cannot be adopted because of the absence of capsular bag support. These lenses can be implanted on either the posterior or the anterior surface of the iris. In this work, we study whether one of these options is preferable over the other from the mechanical point of view. In particular, we focus on the forces that the IFIOL transmits to the iris, which are associated with the risk of lens dislocation. We study the problem numerically and consider aqueous flow induced by saccadic rotations in the cases of an IFIOL in the anterior and posterior sides of the iris. The considered IFIOL is the Artisan Aphakia +30.0 D lens (IFIOL) produced by Ophtec BV. We perform the simulations in openfoam. We find that the forces transmitted by the aphakic IFIOL to the iris are significantly higher in the case of posterior implantation. This suggests that lens implantation on the posterior surface of the iris might be associated with a higher risk of lens dislocation, when an inadequate amount of iris tissue is enclavated during implantation.


Author(s):  
T. V. M. Rao

Bauxite is of twofold interest due firstly to its economic importance, and secondly to the scope it affords for scientific investigation. When these two reasons are taken into consideration, one can easily account for the enormous and rapid accumulation of literature concerning this subject. Any attempt to give a detailed account of the literature will only mean unnecessary repetition of what has been already dealt with at great length by several writers, of whom Anderson and Fox may be specially mentioned. The relation between bauxite and laterite is so intimate that a detailed study of the one is impossible without any reference to the other, and as such the description of and frequent reference to the latter should not be considered as any digression from the subject.


2005 ◽  
Vol 15 (2) ◽  
pp. 219-240 ◽  
Author(s):  
A. MARK SMITH

From the late thirteenth to the early seventeenth century, the process of visual imaging was understood in the Latin West as an essentially subjective act initiated by the eye and completed by the brain. The crystalline lens took center stage in this act, its role determined by its peculiar physical and sensitive capacities. As a physical body, on the one hand, it was disposed to accept the physical impressions of light and color radiating to it from external objects. As a sensitive body, on the other hand, it was enabled by the visual spirit flowing to it from the brain to feel those impressions visually. Acting as a sentient selector of visual information, the lens transformed the brute physical impressions of light and color into visual impressions. These, in turn, gave rise to perceptual “depictions” that were passed back along the stream of visual spirits to the brain. Known in Scholastic parlance as “intentional species,” these depictions served as virtual representations of their generating objects. As such, they provided the wherewithal not only for perception, but also for conception and cognition.


2017 ◽  
Vol 22 ◽  
pp. 154-170
Author(s):  
Andrzej Czajowski

Politica towards killing people in social conflicts. Theoretical-methodological lectureThere are two sides of life: its continuation to natural death and premature annihilation. These two processes occur in parallel, subjecting to nature and culture. This means that human life, regardless of natural condi­tions, depends in some respects on tradition and politica politics and policy. People primarily protect life, but at the same time kill people and prevent killing in order to meet a number of needs. Often the cause of killing is the clash of those aims and then the killing is used to settle conflicts. Politica has a contradictory role in killing people: on the one hand counteracts this phenomenon, and on the other hand favors. De­pending on the relationship between politica and killing, we differentiate killing politica, politica facilitating killing, anti-killing politica and non-killing politica.The nature and implications of politica involvement in killing of people in conflicts depend on the nature of the conflict. Another is the relation of politica to this phenomenon when the conflict is non-political and the other when it is political.Politica — from its advent to our modern times — is transformed into: apparently killing and encouraging killing, giving way to ever more visible counteracting killing and non-killing.


2018 ◽  
Vol 17 (2) ◽  
pp. 147-161
Author(s):  
Fitri Yuliana

Di satu sisi, penekanan modernisme pada rasionalitas dan historisitas telah menghasilkan kristologi yang kritis-objektif. Di sisi lain, pascamodernisme yang berepistemologi pluralis menghasilkan kristologi yang subjektif. Menanggapi dan menjembatani dua sisi persoalan ini, pendekatan hermeneutis redemptive-historical diajukan sebagai pendekatan alternatif injili. Pendekatan yang berpusat pada Kristus sebagai kulminasi sejarah penebusan (seperti yang disaksikan Alkitab) ini mengaitkan tiga horizon yaitu: textual, epochal, dan canonical untuk menginterpretasikan teks Kitab Suci secara holistik. Pendekatan ini menganalisis sintaksis, konteks sastra, konteks sejarah dan genre-nya (textual horizon), mengaitkannya dengan sejarah penebusan (epochal horizon), dan melihatnya dalam terang keutuhan kanon (canonical horizon). Penggabungan ketiga unsur tersebut menekankan dinamika pemenuhan janji Allah dalam kulminasi tersebut. Dengan demikian, pendekatan hermeneutis redemptive historical dapat mengarahkan orang Kristen pembacaan dan penafsiran Alkitab yang kristosentris. Kata-kata kunci: Pendekatan Redemptive-Historical, Epistemologi, Kristologi Modern Kristologi Pascamodern, Hermeneutika Injili Kristosentris On the one hand, the emphasis of modernism on rationality and historicity has produced a critical-objective Christology. On the other hand, post-modernism with a pluralist epistemology produces subjective Christology. Responding to, and bridging the two sides of this problem, the redemptive-historical hermeneutical approach is proposed as an alternative evangelical approach. The Christ-centered approach as the culmination of the history of redemption (as witnessed to in the Bible) links three horizons, namely: textual, epochal, and canonical to interpret the text of the Scriptures holistically. This approach analyzes syntax, literary context, historical context and its genre (textual horizon), links it to the history of redemption (epochal horizon), and sees it in the light of the canon (canonical horizon). The combination of these three elements emphasizes the dynamic fulfillment of God’s promises. Thus, the historical redemptive hermeneutical approach can lead Christians to read and interpret the Christocentric Bible. Keywords: Redemptive-Historical Approach, Epistemology, Modernist Christology, Post-modernist Christology, Christ-centered Evangelical Hermeneutics


Author(s):  
Jeffrey G. Silcock

Luther does not develop a theology of hope because hope is not the central driver of his mature theology. Central for him is rather faith in the promise of God, which gives rise to hope as well as love. There are two sides to justification that correspond to the now/not-yet character of Luther’s eschatology. On the one hand, we are already righteous through the gift of Christ’s righteousness, which we have in spe but not yet in re. On the other hand, the hope of righteousness strengthens us against sin as we wait for the perfection of our righteousness in heaven. However, in the final analysis, the basis of our hope is not the incipient righteousness which has begun in us (in re) as we gradually grow in holiness and righteousness, but Christ’s own perfect righteousness which he imputes to us through faith (iustitia aliena). For hope can only be rock-solid if it is grounded not on anything within us, but on Christ alone. The early Luther has a very different view of things because, before 1518, he is still very much under the influence of Augustine, which means that justification is primarily a process that goes on within a person’s heart rather than, as in the later Luther, faith in God’s word of promise that comes to a person from outside and gives what it says. The dominant theological concept in Luther’s early work is the theology of humility, which is predicated on the view that God must first humble you and cause you to despair, before he can raise you up and give you hope. Since here faith is not yet oriented to the promise but defined by humility, it has to remain uncertain, as does hope. In the later Luther, on the other hand, faith gives rise to confidence and hope because it is firmly grounded in God’s word of promise, which is always reliable because God does what he says. With his faith firmly grounded in Christ, Luther knows that he can weather all the trials and struggles of life; in fact, he can even look forward to death, since for Christians death is but the door to life with God forever. For Luther, Christ is the only hope for a hopeless world. For him, this is not wishful thinking but is rock-solid because it is based on the promise of the crucified and risen Lord. This is also the basis of the Christian hope for eternal life in the presence of the Triune God, together with the renewed creation and all the hosts of heaven.


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