DNA sequences classification and computation scheme based on the symmetry principle

The DNA sequences containing multifarious novel symmetrical structure frequently play crucial role in how genomes work. Here we present a new scheme for understanding the structural features and potential mathematical rules of symmetrical DNA sequences using a method containing stepwise classification and recursive computation. By defining the symmetry of DNA sequences, we classify all sequences and conclude a series of recursive equations for computing the quantity of all classes of sequences existing theoretically; moreover, the symmetries of the typical sequences at different levels are analyzed. The classification and quantitative relation demonstrate that DNA sequences have recursive and nested properties. The scheme may help us better discuss the formation and the growth mechanism of DNA sequences because it has a capability of educing the information about structure and quantity of longer sequences according to that of shorter sequences by some recursive rules. Our scheme may provide a new stepping stone to the theoretical characterization, as well as structural analysis, of DNA sequences

Problems, Causes and Countermeasures of Chinese Writing of Senior Students in Primary School

In primary school Chinese teaching, composition is an important part of teaching, and it is the practice of comprehensive ability of primary school students’ understanding level and language expression. The level of students’ essays not only reflects the students’ ability to use the language, but also marks the language literacy. Therefore, the teaching of the primary school language is crucial to the improvement of primary school composition. However, in the language teaching of primary schools, the cultivation of writing ability has always been the focus and difficulty. The upper primary school is an important link between primary and secondary schools. The cultivation of writing ability is more important and should not be underestimated. In short, in the process of Chinese language teaching in the upper primary school, teachers should pay attention to cultivating students’ writing ability and improve students’ writing ability as an important task in Chinese teaching. This paper mainly explains the existing problems and causes of the writing of senior students in primary school through theory, and proposes corresponding countermeasures for the high school students’ writing ability

Efficacy of Platelet-Rich Plasma (PRP) Injections vs Topical Minoxidil in Adults with Androgenetic Alopecia

Androgenetic alopecia is a condition mediated by androgen (specifically DHT) and genetic factors that causes hair loss and thinning of the scalp in men and women. The hairs’ anagen phase is shortened and terminal hairs transition into vellus hairs. Although this condition is considered cosmetic in nature, it has psychologically detrimental effects. There are medical treatments available to prevent further hair loss but there is currently no cure. Topical minoxidil (Rogaine) is the most commonly used medication for androgenetic alopecia that stops hair loss and, in some cases, helps hair regrowth. However, it can cause an allergic contact dermatitis, local irritation and hypertrichosis. Not to mention, its efficacy relies on the patient’s compliance as it must be applied daily for the rest of the patient’s life span. Platelet-rich plasma injections for AGA is a treatment that is becoming more widespread as a safe, non-allergic treatment method with little/mild to no side effects with many research studies assessing and comparing its efficacy