The Pockels effect in periodically poled lithium niobate made it possible to switch optical signals between two orthogonal optical linear polarizations of the vertical and horizontal polarization states. Based on this effect, we demonstrated polarization-based binary optical logic gates: AND, and OR gates. By combining these basic gates with other polarization-based optical logic gates such as ...

This work demonstrates two DNA-based logic circuits that behave as a half-adder and a half-subtractor. A half-adder is composed of an AND gate and an XOR gate, whereas a half-subtractor consists of an INH gate and an XOR gate. The proposed designs are inspired by molecular beacons.

Ecological character displacement (ECD), the evolutionary divergence of competing species, has oscillated wildly in scientific opinion. Initially thought to play a central role in community assembly and adaptive radiation, ECD recovered from a 1980s nadir to present-day prominence on the strength of many case studies compiled in several influential reviews. However, we reviewed recent studies a...

S u m m a ry : Previous studies have demonstrated that lichens can accumulate high amounts of radioactivity. Because of their long life expectancy they are suitable and inexpensive biological detectors of the nuclear fallout. In this study, liehen samples were collected from diffe­ rent locations in Austria over a period of more than 15 years. Samples were taken before, immediately after and a ...

Biological control (BC) is defined as the use of living natural enemies, antagonists, or competitors (biological agents) to other organisms. In second half last century, general interest in BC has increased considerably because greater environmental awareness society and implementation integrated pest management (IPM) strategies have pushed towards development environmentally friendly approache...

Residues of the polar pesticide pymetrozine were compared using two methods: hydromatrix and liquid-liquid extraction (LLE). The biological half-life and the final residue level were investigated using Aster scaber over a 10-days cultivation period. The respective biological half-lives of the pesticide were 4.2 and 3.5 days at the recommended and double dose. The final residue levels were 1.28 ...

mellitus. Its biological half life is 2.5 to 3 hours. Due to its short biological half life and narrow absorption window, it is incompletely absorbed in the small intestine. It is a strong base (pKa = 11.5), protonated depending on the physiological pH of the human body. It is also poorly absorbed in the colon. However, reduction of gastrointestinal motility enhances the drug absorption. Most o...

Nanoparticle (NP) drug delivery systems (5-250 nm) have the potential to improve current disease therapies because of their ability to overcome multiple biological barriers and releasing a therapeutic load in the optimal dosage range. Rapid clearance of circulating nanoparticles during systemic delivery is a critical issue for these systems and has made it necessary to understand the factors af...

The treatment of thyroid cancer using an unsealed source of radioactive materials is usually associated with a large amount of 131I. A major problem for hospital admission of these patients is the waste disposal which requires protection of the public. 152 patients with thyroid cancer admitted to the nuclear medicine department of Said AI- Shohada Hospital for UI I treatment were studied. 1...

African history and world history each became substantial fields of historical study in the aftermath of the Second World War. African history organized rapidly in the 1950s and 1960s, an era dominated by modernization-thinking. World history developed slowly until the 1990s, then quickly expanded and generated institutional homes in a time of globalization-thinking. This piece considers issues...