200 English Essays

This study investigated the in vitro effects of ZnO NP and chemical UV filters commonly used sunscreens on the function of immortalised and primary skin cells. ZnO particulates (30 nm, 80 nm and 200 nm) were compared to the chemical UV filters: butylmethoxydibenzoylmethane (BMDBM) ethylhexylmethoxycinnamate (EHMC), ethylhexylsalicylate (EHS), homomenthylsalicylate (HMS) and 4-methylbenzylidenecamphor (MBC). Human epidermal keratinocytes (NHEK), epidermal melanocytes (NHEM), dermal fibroblasts (NHDF) and the immortalised keratinocyte HaCaT cell line were used in this study.

324p runthenight05 01-03-2023 8 2   Download

Steel fiber reinforced concrete (SFRC) is a multiple-composite material developed during the early 1970s. In SFRC, short steel fibers are randomly distributed in concrete. Steel fibers can prevent the development of micro-cracks inside the concrete and reduce the expansion and development of the macro-cracks, thus enhance mechanical performance of SFRC. However, there is lack of studies on the influence of flowability of fresh SFRC on the steel fiber distribution patterns and mechanical properties of hardened SFRC.

85p runthenight04 02-02-2023 5 4   Download

Cuốn sách này giúp cho các bạn đang chuẩn bị thi vào đại học ngoại ngữ hoặc đang theo học tại các đại học ngoại ngữ hay các trung tâm ngoại ngữ, giúp các bạn có thể trình bày, lối hành văn đúng với ngữ pháp và cấu trúc tiếng Anh. Sách được chia 2 phần, phần 1 ebook gồm 136 bài luận, mời các bạn cùng tham khảo để biết thêm chi tiết.

200p cucngoainhan9 07-04-2022 80 12   Download

Phần 2 của cuốn "200 bài luận tiếng Anh" gồm có 64 bài luận với nhiều chủ đề và nhiều đối tượng khác nhau, giúp các bạn có thể tham khảo cách trình bày, lối hành văn đúng với ngữ pháp và cấu trúc tiếng Anh. Thông qua các bài luận trong cuốn sách, cũng góp phần mở mang kiến thức về cuộc sống cho các bạn. Mời các bạn cùng tham khảo.

169p cucngoainhan9 07-04-2022 52 11   Download

The objectives of the thesis: Research and fabricate the one-dimensional (1D) – nanoporous silicon microcavity (1D-NPSMC) structures by using electrochemical etching method with the selectivity of wavelength in visible range from 200 nm to 800 nm.

28p xacxuoc4321 09-07-2019 30 5   Download

The objectives of the thesis: Research and fabricate the one-dimensional (1D) – nanoporous silicon microcavity (1D-NPSMC) structures by using electrochemical etching method with the selectivity of wavelength in visible range from 200 nm to 800 nm. The 1D-NPSMC structures has high reflectivity, narrow linewidth of the pass-band and homogeneous pores.

28p xacxuoc4321 09-07-2019 42 6   Download

This study is carried out to investigate the area of addressing terms between members in families in Vietnamese and English culture from major perspectives namely the common terms and the affecting factors on the choice of the terms. There are 200 people who are from different Vietnamese and English families take part in this study.

77p minhxaminhyeu1 06-05-2019 67 10   Download

Research objectives: To identify the rationale and practice of self-assessment in quality management (focusing on quality management level) at high schools, basing on which, propose certain measures to innovate the SA activities at high schools in Vietnam; the survey conducted using questionnaires is for 200 managers and teachers at 10 high schools in four districts and the city of Thai Binh province.

24p change03 06-05-2016 55 2   Download

Các phương pháp đo nhiệt độ, giới thiệu tổng quát về PLC, giới thiệu về SCR và các IC được sử dụng trong mạch, thiết kế phần cứng, phần mềm,... là những nội dung chính trong luận văn tốt nghiệp "Thiết kế mô hình đo và điều khiển nhiệt độ giao tiếp Module Analog PLC S7-200". Mời các bạn cùng tham khảo.

89p khungbogugo 14-01-2016 266 76   Download

The in vitro activities of purified potato starch branching enzyme (SBE) I and II expressed in Escherichia coli were compared using several assay methods. With the starch– iodine method, it was found that SBE I was more active than SBE II on an amylose substrate, whereas SBE II was more active than SBE I on an amylopectin substrate. Both enzymes were stimulated by the presence of phosphate.

6p system191 01-06-2013 47 4   Download

Tripeptidyl-peptidase II (TPP II) is a large (Mr106 ) tripeptide-releasing enzyme with an active site of the subtil-isin-type. Compared with other subtilases, TPP II has a 200 amino-acid insertion between the catalytic Asp44 and His264 residues, and is active as anoligomeric complex. This study demonstrates that the insert is important for the formation of the active high-molecular mass complex.

6p research12 29-04-2013 37 3   Download

We have identified and characterized a thermostable thio-redoxin system in the aerobic hyperthermophilic archaeon AeropyrumpernixK1. Thegene (Accessionno.APE0641) of A. pernixencoding a 37 kDaprotein contains a redox active site motif (CPHC) but its N-terminal extension region (about 200 residues) shows no homologywithin the genome database. A second gene (Accession no. APE1061) has high homology to thioredoxin reductase and encodes a 37 kDa protein with the active site motif (CSVC), and binding sites forFADandNADPH....

8p tumor12 22-04-2013 33 2   Download

Even though more than 200 three-dimensional structures of HIV-1 protease complexed to a variety of inhibitors are available in the Protein Data Bank; very few struc-tures of unliganded protein have been determined. We have recently solved structures of unliganded HIV-1 protease tethered dimer mutants to resolutions of 1.9 A˚ and 2.1 A ˚ , and have found that the flaps assume closed-flap conformation even in the absence of any bound lig-and.

9p tumor12 20-04-2013 21 2   Download

Human novel reductase 1 (NR1) is an NADPH dependent diflavin oxidoreductase related to cytochrome P450reduc-tase (CPR). The FAD/NADPH- and FMN-binding domains of NR1 have been expressed and purified and their redox properties studied by stopped-flow and steady-state kinetic methods, and by potentiometry.

12p tumor12 20-04-2013 41 2   Download

A cellulase [endo-b-1,4-D-glucanase (EC 3.2.1.4)] was iso-lated from the hepatopancreas of abalone Haliotis discus hannaiby successive chromatographies on TOYOPEARL CM-650M, hydroxyapatite and Sephacryl S-200 HR. The molecular mass of the cellulase was estimated to be 66 000 Da by SDS/PAGE, thus the enzyme was named HdEG66. The hydrolytic activity of HdEG66 toward carb-oxymethylcellulose showed optimal temperature and pH at 38
Cand 6.3, respectively.

8p tumor12 20-04-2013 45 4   Download

Thrombomodulin (TM) slows down the interaction rate between thrombin and plasminogen activator inhibitor 1 (PAI-1). We now show that the 12-fold reduced inhibition rate in the presence ofTM does not result from an altered distribution between PAI-1 cleavage and irreversible com-plex formation. Surface plasmon resonance (SPR) revealed an over 200-fold reduced affinity of TM for thrombin-VR1 tPA as compared to thrombin, demonstrating the importance ofthe VR1 loop in the interaction ofthrombin withbothTMandPAI-1....

10p fptmusic 16-04-2013 42 3   Download

The composition of the chloroplast-localized protease complex, ClpP, from the green alga Chlamydomonas reinhardtiiwas characterized by nondena-turing electrophoresis, immunoblotting and MS. The detected ClpP complex has a native mass of
540 kDa, which is
200 kDa higher than ClpP complexes in higher plant chloroplasts, mitochondria or bacteria. The 540-kDa ClpP complex contains two nuclear-encoded ClpP proteins (ClpP3 and P5) and five ClpR (R1, R2, R3, R4 and R6) proteins, as well two pro-teins, ClpP1Land ClpP1H, both probably derived from the plastid clpP1 gene. ...

14p fptmusic 12-04-2013 44 3   Download

The molecular chaperone Hsp90 is distinct from Hsp70 and chaperonin in that client proteins are apparently restricted to a subset of proteins categor-ized as cellular signaling molecules. Among these, many specific protein kinases require the assistance of Hsp90 and its co-chaperone Cdc37⁄p50 for their biogenesis. A series of Cdc37 deletion mutants revealed that all mutants capable of binding Raf-1 possess amino acid residues between 181 and 200.

7p fptmusic 12-04-2013 48 1   Download

To test the role of poly(ADP-ribose) polymerase on the telomerase activity, we determined the telomerase activity in leukemic cells K562 treated with benzamide and 4-amino 1,8 naphthalimide (NAP), the inhibitors of PARP. We observed that both the agents inhibited telomerase activity in a dose-dependent manner. The doses of benzamide and NAP that inhibited telo-merase activity to 50% of untreated control cells were 10.7 ± 0.6 mmand 200 ± 7lm, respectively.

12p fptmusic 11-04-2013 47 2   Download

TheCa 2+ -ATPaseof skeletalmuscle sarcoplasmic reticulum (SERCA), an integral membrane protein, becomes irre-versibly inactivatedin vitroby the addition of a single bolus of peroxynitritewithaK0.5of 200–300lM, and this results in a large decrease of theATP-dependentCa 2+ gradient across the sarcoplasmic reticulum (SR) membranes. The inactiva-tion of SERCA is raised by treatment of SR vesicles with repetitivemicromolar pulses of peroxynitrite.

11p dell39 03-04-2013 31 3   Download