We consider a silicon wafer, pierced by millions of identical pores with periodically varying diameters but without spatial inversion symmetry (ratchet profile). When a liquid is periodically pumped back and forth through the pores, our theory predicts a net transport of suspended micrometer-sized particles (drift ratchet). The direction of this particle current depends very sensitively on the ...

We report a rare combination of variations in the upper limb of a human cadaver. Accessory flexor carpi ulnaris with absent palmaris longus was observed in the left forearm during routine dissection of a male cadaver. Variant vascular pattern was observed bilaterally. Brachial artery bifurcated at a higher level. Ulnar artery gave rise to persistent median artery (PMA) which pierced the median ...

Foreign body ingestion can be seen at all ages, especially in childhood. Most swallowed foreign objects are disposed from the body without any health problems through defecation. It is rare that a foreign object perforates the intestine and migrates into the liver or peritoneum. In our case two unintentionally swallowed needles pierced the intestine and were located in the left lobe of the live...

The present study reports an anomalous branching pattern of the thoracic sympathetic chain. At the level of T3 ganglion, an anomalous branch i.e accessory sympathetic chain (ASC) descended anteromedial to the main sympathetic chain (MSC). The MSC and the ASC communicated with each other at the level of T9, T10 and T11 ganglion, indicating the absence of classical pattern of greater, lesser and ...

A black hole image contains a bright ring of photons that have closely circled the on their way from source to detector. Here, we study photon rotating which is pierced by global hyper-light axion-type cosmic string. We show coupling $\phi F \tilde{F}$ between axion $\phi$ and can give rise unique polarimetric structure ring. The emerges due an Aharonov-Bohm type effect leads change polarizatio...

Abstract Composite components combine the benefits of different materials, leading to improved product properties, enhanced resource- and energy efficiency widening spectrum. Draw-forging is unique combination deep-drawing cold forging, where a core material encapsulated within thin sheet metal blank. Previously, basic draw-forging process only allowed covering shaft tip, covered length was lim...

HIV can be transmitted through contaminated blood and blood products; from a mother to her offspring during pregnancy, childbirth or breast feeding; or through sexual contact. Sexual transmission remains by far the predominant mode of transmission [1]. Vertical and blood borne transmission of HIV are highly predictable, and very efficient modes. The recipient of a unit of contaminated blood nea...

Given a finite family F of axis-parallel boxes in R such that F contains no k + 1 pairwise disjoint boxes, and such that for each two intersecting boxes in F a corner of one box is contained in the other box, we prove that F can be pierced by at most ck log log(k) points, where c is a constant depending only on d. We further show that in some special cases the upper bound on the number of pierc...

The ultrastructure of the jaws of Ordovician, Silurian, Permian and Recent Eunicida (Polychaeta) have been studied by transmission and scanning f'lectron microscopy. Primary and secondary zones have been distinguished in the ultrastructure of the jaws. The primary zone is formed of the pharyngeal cuticle containing an orthogonal network of collagen fibrils, while the secondary zone, underlying ...

pedicle was si flat band narrowing from the above origin to a breadth of 2\ inches, and then extending and becoming cylindrical so as to enclose the tumour which was itself almost spherical. A vessel of considerable size could be felt pulsating in the pedicle and a little soft tissue. The upper part of the tumour felt fatty, and the lower harder and fibrous. The skin at the extremity had been p...