The known titanoheterocyclic compound〓 was synthesized in high yield by a new route involving an oxidative addition reaction of "titanocene"with benzil, and its structure was first confirmed by a single crystal X-ray diffraction method.

首次由&二茂鈦&與二苯乙二酮的氧化加成反應(yīng)www...一级国产，高產(chǎn)率地合成了一個(gè)已知的高價(jià)鈦雜環(huán)化合物〓，并首次用X-射線衍射法測(cè)得該化合物的單晶分子結(jié)構(gòu)欧美狂野性爱一级。

An inclusion complex -BINOL--Omeprazole or -BINOL--Omeprazole was first obtained from racemic omeprazole with chiral host --or --2, 2'- dihydroxy-1, 1'-binaphthyl in high selectivities, and thus both optically pure enantiomers of omeprazole were prepared as syrup with more than 99% enantiomeric excess, the overall yields of both two enantiomers are more than 60%.

首次發(fā)現(xiàn)光學(xué)純R--或s--聯(lián)二萘酚高效識(shí)別并包結(jié)R--或S--奧美拉唑亚洲视频第一，形成包結(jié)絡(luò)合物的現(xiàn)象，并首次將包結(jié)拆分法應(yīng)用于手性苯并咪唑類抗?jié)兯幬锏闹苽湫寓鶻XXXHD欧美精品，用一種構(gòu)型的光學(xué)純聯(lián)二萘酚直接拆分奧美拉唑久久久久久免费精品电影网，可同時(shí)得到油狀或糖漿狀e.e。

Nov.. New genus Guizhoueocrinus of which is firstly discovered in the Lowe Cambrian stratum from China , and worm, bradoriida, large bivalved arthropods from Balang Formation also are initially reported.

其中新屬Guizhoueocrinus在我國(guó)早寒武世地層為首次發(fā)現(xiàn)欧美又黄又大又粗大片，蠕形動(dòng)物国产又粗又猛又爽的野外视频，高肌蟲，大型雙瓣殼節(jié)肢動(dòng)物為杷榔組首次發(fā)現(xiàn)5要A片欧美无线看，改變了杷榔組的生物面貌亚洲欧洲美洲无码精品Va水蜜桃。

The result showed that the volume, dry weight and total sugar content of root gradually reduced with the harvest frequency, but the reductive sugar content in root increased. While the harvesting frequency was two times per year, the volume and dry weight of alfalfa root showed an decreasing at beginning and then increasing when the first harvesting was at different growth stages and the lowest values were at flowering period however, it was not significant for brome.

結(jié)果表明：隨刈割次數(shù)增加，兩種牧草根體積欧美视频一区二二区、根干重和根部總含糖量逐漸減小欧美一级淫片在线观看，而根系還原糖含量呈逐漸增加的趨勢(shì)；在年刈割兩次精品视频黄色，首次刈割分別在不同生育時(shí)期試驗(yàn)處理中亚洲一区二区三区性爱视频，苜蓿根體積和干重呈先減后增趨勢(shì)，首次刈割在盛花期根體積和干物質(zhì)含量均最低av高清不卡，而無芒雀麥變化不明顯一级e片网站。

He first synthesis of the precursor 45b of Tuxpanolide was accomplished fromβ-alkoxy aldehyde and β-acetoxy-γ-butyrolactone by the Aldol reaction.

uxpanolide的合成前體45b的首次不對(duì)稱合成：以β-烷氧基開鏈醛和β-乙酰氧基-γ-丁內(nèi)酯參與的Aldol醛醇縮合反應(yīng)首次得到了前體化合物45b。

Compound 1 is a new compound, the others are isolated from this genus for the first time, and this is the first time to report lignan compounds from genus Celastrus.

化合物1為新化合物麻豆九一PORNY，其余化合物為首次從該屬植物中分離得到白白色在线观看视频。本文為首次報(bào)道該屬植物中的木脂素類化合物。

Compounds 1-9 were obtained from this plant for the first time. Compounds 2, 5-9 were isolated from family Chloranthaceae for the first time.

化合物1～9均是首次從該植物中分離得到成黄色激情视频网站，化合物2色哟哟中文字慕，5～9為首次從該科中分離得到国产一级视频性交。

Compounds 2-4 were isolated from the plants of Chloranthaceae for the first time.The antibacterial activities of these six compounds were tested for the first time.Some compounds may have potential for future study and development as plant-derived oral antibacterial agents.

化合物1為1個(gè)新的天然產(chǎn)物，化合物2~4為首次從金粟蘭科植物中分離得到欧美日本三级片国产馆，首次測(cè)定了6種香豆精類化學(xué)成分的抗菌活性日韩uuu，一些化合物具有進(jìn)一步研究開發(fā)成為抑制口腔細(xì)菌的天然藥用植物制劑的潛力。

For a 1116Kg chromitite and a 384Kg mantle peridotite sample, by heavy mineral separation and picking up under a binocular microscope following productions are obtained: the UHP minerals including moissanite and over 1000 diamond grains are discovered firstly from the Kangjinla chromitite orebody Cr-11, which is far more abundant than the Luobusa district; a series of unusual mantle minerals like moissanite and a great deal of diamond grains are discovered firstly from the host rocks of chromitite orebody Cr-11, providing the foundation of discussing the chromitite origin and its relation with the host rocks; besides the UHP minerals like moissanite and diamond, various special mantle minerals are revealed from the chromitite orebody Cr-11 and its host rocks including some native elements, alloys, oxides, sulphides, silicates, carbonates, and tungstates.

2人工重砂發(fā)現(xiàn)鉻鐵礦和地幔橄欖巖中的金剛石等特殊地幔礦物三级插入小视频在线观看。1116 Kg鉻鐵礦和384Kg地幔橄欖巖大樣經(jīng)人工重砂分選和雙目顯微鏡下挑選礦物国产洗澡网站，取得如下成果：首次在康金拉11號(hào)鉻鐵礦體中發(fā)現(xiàn)了上千粒金剛石，以及碳硅石等強(qiáng)還原環(huán)境的超高壓礦物自拍偷拍19页，數(shù)量遠(yuǎn)遠(yuǎn)超過在羅布莎鉻鐵礦礦區(qū)中發(fā)現(xiàn)的金剛石一个人在线视频免费观看片毛片；首次在康金拉11號(hào)鉻鐵礦礦體的近礦圍巖中發(fā)現(xiàn)了大量金剛石和碳硅石等一批異常地幔礦物，為探討鉻鐵礦的成因及與近礦圍巖地幔橄欖巖的關(guān)系奠定了基礎(chǔ)日韩精品视频网站免费观看；除挑選出金剛石和碳硅石等超高壓礦物国内精品自产拍在线观看999，在康金拉11號(hào)鉻鐵礦礦體與圍巖地幔橄欖巖中還發(fā)現(xiàn)了自然鐵球、金屬互化物卡通亚洲动漫、氧化物欧美一级被操黄色网站、硫化物、硅酸鹽等一批異常地幔礦物免费深黄色无人在线观看。

Objective The examination of barium enema ever since 1905,colonoscope occurrence,it is very development to diagnose in small nonpolypoid lesion of large bowel.

目的195年首次鋇灌腸X線檢查被用于臨床診斷大腸病變以來有没有黄片免费视频2019，大腸鏡的問世，為提高早期大腸癌的診斷和治目的 1905年首次鋇灌腸X線檢查被用于臨床診斷大腸病變以來黄色一区二区三，大腸鏡的問世黄色网站永久，為提高早期大腸癌的診斷和治療，提供了最簡(jiǎn)便搞黄真人网站、最安全2021国产精品区在线观看、最有效的方法。