An implicit surface is defined as the zero set of a scalar function over 3-space. Sign of implicit function determines whether a point is inside or outside the implicit surface: f (P )  = 0 P is on the surface. < 0 P is inside the surface. > 0 P is outside the surface. An algebraic function is an implicit function where the function is polynomial. By using an A-patch representation of algebra...

زمینه و هدف: خلق مثبت انعطاف‌پذیری شناختی از عوامل تقویت کننده خلاقیت شناخته‌ می‌شوند. مطالعه حاضر با این فرض که احتمالاً اثرگذاری بر موجب ارتقا می‌شود، مهم را در بازه سنی 8 تا 12 سال بررسی کرده است. روش پژوهش: جامعة پژوهش شامل کلیه دانش آموزان دختر ۱۲ ساله مناطق 4 ۸ شهر تهران بودند. جامعه 60 نفر دو گروه ۱۰ (76/0±80/8) (76/0±20/11) به نمونه‌گیری دسترس انتخاب شد. پس جایگذاری تصادفی افراد گروه‌های...

Apomyoglobin folding proceeds through a molten globule intermediate (low-salt form; I1) that has been characterized by equilibrium (pH 4) and kinetic (pH 6) folding experiments. Of the eight alpha-helices in myoglobin, three (A, G, and H) are structured in I1, while the rest appear to be unfolded. Here we report on the structure and stability of a second intermediate, the trichloroacetate form ...

The molecular composition and organization of the row of axonemal inner dynein arms were investigated by biochemical and electron microscopic analyses of Chlamydomonas wild-type and mutant axonemes. Three inner arm structures could be distinguished on the basis of their molecular composition and position in the axoneme as determined by analysis of pf30 and pf23 mutants. The three inner arm stru...

هدف: با توجه به رشد روزافزون آموزش شیوه مجازی و ویژه در شرایط گسترش پاندمی کرونایروس، نقش اساسی مدیریت کلاسی ارتقا کیفیت باید مورد قرار گیرد این پژوهش هدف تدوین مدل رابطه علّی هدفمند کلاس وضعیت روان‌شناختی پیامدهای تحصیلی دانشجویان انجام شد. روش: روش بر حسب هدف، کاربردی ماهیت از نوع توصیفی - همبستگی بود. جامعه آماری مشتمل انواع مقاطع دانشگاه­ های دولتی پیام نور شهر تهران نمونه اساس جدول مورگان ب...

will mean the sum of the values f (i1, i2, ..., ik) over all ”good” k-tuples (i1, i2, ..., ik) ; hereby, a k-tuple (i1, i2, ..., ik) is called ”good” if it satisfies iu ∈ {1, 2, ..., n} for every u ∈ {1, 2, ..., k} and also satisfies all the assertions A1, A2, ..., Al. Using this notation, we can write many typical sums in a simpler form: For instance, ∑ 1≤i≤n f (i) = i ∑ f (i) , and ∑ 1≤i<j≤n ...

In the tunnel limit, the current-phase relation of Josephson junctions can be expanded as I(φ) = I1 sinφ + I2 sin 2φ. Standard BCS theory predicts that I1RN ∼ ∆/e and I2/I1 ∼ D, where RN is the resistance of the junction in the normal state, ∆ is the superconducting gap, and D ≪ 1 is the junction transparency. In the cuprates, the experimental value of I1RN (I2/I1) is much smaller (larger) than...

Choline-binding modules are present in some virulence factors and many other proteins of Streptococcus pneumoniae (Pneumococcus). The most extensively studied choline-binding module is C-LytA, the C-terminal moiety of the pneumococcal cell-wall amidase LytA. The three-dimensional structure of C-LytA is built up from six loop-hairpin structures forming a left-handed beta-solenoid with four choli...

1.1 Addresses, Areas and Regions We iteratively define an area A as a special subspace of a d-dimensional cube as follows: Split the cube with respect to every dimension in the middle, resulting in 2 subcubes numbered in some arbitrary but fixed order (for our implementation and this paper we used Z-ordering) from 1 to 2. An area A1 of level 1 consists of the first i1 closed subcubes. i1 determ...

A phenomenon already discovered more than 25 years ago is the possibility of naïve helper T cells to polarize into TH1 or TH2 populations. In a simplified model, these polarizations occur at opposite ends of an "immune 1-2 axis" (i1-i2 axis) of possible conditions. Additional polarizations of helper/regulatory T cells were discovered later, such as for example TH17 and Treg phenotypes; although...