Archaea - lub sijhawm ntawd tsuas yog cov tshuaj methanogens paub - yog thawj zaug cais tawm ntawm cov kab mob hauv xyoo 1977 los ntawm Carl Woese thiab George E. Fox raws li lawv cov ribosomal RNA (rRNA) noob
Cov ntoo ntoo ntsuab muab cov ceg twisted ib lub raj mis- txhuam hniav. Cov koob ntawm tsob ntoo nyob ib puag ncig ntawm ceg kom txog li ib ko taw ze ntawm qhov kawg ntawm tus ceg. Lub npe bristlecone ntoo thuv yog hais txog cov poj niam tsaus ntuj tsaus nti cones uas dais incurved prickles ntawm lawv qhov chaw
Xav txog lwm daim duab peb sab uas tsis yog txoj cai, sau npe raws li qhia nrog sab ntev x thiab y. Peb tuaj yeem muab tau ib txoj cai muaj txiaj ntsig uas tsuas muaj cov haujlwm cosine xwb. Txoj cai ntawm cosines tuaj yeem siv los nrhiav kev ntsuas ntawm lub kaum sab xis lossis ib sab ntawm daim duab peb sab uas tsis yog txoj cai yog peb paub: peb sab thiab tsis muaj kaum
Nws yog tseeb hais tias ib feem ntawm lub molecule yog tsis zoo them - N2O5 yog ib tug polar molecule
Lub pob zeb yog ib chav tsev ntawm qhov hnyav sib npaug li 14 phaus averdupois (los yog thoob ntiaj teb lbs). Los ntawm lem, qhov no ua rau lub pob zeb sib npaug rau 6.35029kg. Keeb kwm: Lub npe' pob zeb' muab los ntawm kev xyaum siv pob zeb asweights, ib qho kev coj ua thoob ntiaj teb rau ob txhiab xyoo lossis ntau dua
Hom Cov Khoom Siv Hlau + Nonmetal -> ionic compound (feem ntau) Hlau + Polyatomic ion -> ionic compound (feem ntau) Nonmetal + Nonmetal -> covalent compound (feem ntau) Hydrogen + Nonmetal -> covalent compound (feem ntau)
Kos ib txoj kab kev xav ntsug nrog koj tus ntiv tes mus rau ntawm daim duab thiab tom qab ntawd kos ib txoj kab kev xav mus rau sab laug kom txog thaum koj hla txoj kab ntsug. Nov yog koj qhov Y axis nyeem. Hloov tus lej los ntawm kev sau ntawv tshawb fawb yog tias tsim nyog. Piv txwv li, yog tias kev nyeem ntawv yog 10^2, tus lej tiag yog 1,000
Lead (II) phosphate yog insoluble hauv dej thiab cawv tab sis soluble hauv HNO3 thiab tau kho alkali hydroxides. Thaum cov hlau lead (II) phosphate yog rhuab rau decomposition nws emits cov pa phem heev uas muaj Pb thiab POx. Lead (II) phosphate. Cov npe tshuaj formula Pb3(PO4)2 Molar mass 811.54272 g/mol Zoo li hmoov dawb ceev 6.9 g/cm3
Ib qho yooj yim txaus ntsuas qhov sib xws yog qhov ntsuas cosine zoo sib xws. Kom meej meej, nws yog reflexive (cos(v,v)=1) thiab symmetric (cos(v,w)=cos(w,v)). Tab sis nws kuj tseem hloov tau: yog cos(v,w) nyob ze 1, thiab cos(w,z) nyob ze 1, ces cos(v,z) nyob ze 1
Lub nceeg vaj Animalia yog lub tsev rau ntau tus tsiaj eukaryotic. - Lawv yog cov neeg siv khoom, txhais tau tias lawv tsis tuaj yeem ua lawv tus kheej cov zaub mov. -Lawv yog ib pab pawg ntawm cov kab mob uas sib txawv ntawm millipedes rau tib neeg
Lwm yam xwm txheej xws li av tsis raug kub thiab noo noo, los yog ua ke ntawm ob, yog feem ntau yog vim li cas cov noob tsis germinate raws sij hawm. Cog ntxov dhau, tob dhau, watering ntau dhau lossis tsawg dhau yog qhov ua yuam kev ntau
Koj tuaj yeem npaj cov amine thawj zaug los ntawm nws cov alkylazide los ntawm kev txo qis lossis los ntawm Gabriel synthesis. Hauv Gabriel synthesis, poov tshuaj phthalimide reacted nrog ib qho alkyl halide los tsim N-alkyl phthalimide. Qhov N-alkyl phthalimide no tuaj yeem hydrolyzed los ntawm aqueous acids los yog hauv paus rau hauv thawj amine
Myotonic dystrophy yog ib hom kab mob ntev ntev uas cuam tshuam rau cov leeg nqaij. Cov tsos mob muaj xws li maj mam ua rau cov leeg tsis muaj zog thiab tsis muaj zog. Cov leeg feem ntau cog lus thiab tsis tuaj yeem so. Lwm cov tsos mob tuaj yeem muaj xws li cataracts, kev tsis taus ntawm kev txawj ntse thiab teeb meem hauv lub plawv
Mnemonic Device: Zoo siab Henry Nyob Ib sab ntawm Boron Tsev, Nyob ze Peb tus phooj ywg Nelly Nancy MgAllen. Silly Patrick nyob ze. Ntawm no Nws nyob hauv qab txaj khaub ncaws, tsis muaj dab tsi nyob, xav tias ntshai, Naughty Margret Ib txwm Sighs, "Thov Txhob Clowning Ib puag ncig" (18 ntsiab lus) Nws Li Cas Nws Nyiam Dais Los Ntawm Khob Tsis Tshaj
Tau txais thaum lub Plaub Hlis 20, 1965 Thaum Lub Plaub Hlis 20, Tus Thawj Kav Tebchaws Edmond G. Brown tau kos npe rau Senate Bill No. 265, xaiv cov kub uas yog lub xeev cov pob zeb thiab mineralogic emblem thiab serpentine lub pob zeb thiab lithologic emblem ntawm lub Xeev California
Alcaligenes faecalis tshwm sim hauv dej thiab av. Cov microbe muaj peritrichous flagellar kev npaj uas tso cai rau motility (2). Nws yog ib tug gram-negative, qws-zoo li tus kab mob pom ntawm 0.5-1.0 Μm x 0.5-2.6 Μm nyob rau hauv lub cheeb
Qhov dav, qhov siab, thiab ntev ntawm ib lub thawv tuaj yeem sib txawv. Yog hais tias lawv yog tib yam, ces lub thawv yuav ua aperfectly square box. Qhov ntim, lossis qhov chaw nyob hauv lub thawv yog h × W × L. Qhov chaw sab nraud ntawm lub thawv yog 2 (h × W) + 2 (h × L) + 2 (W × L)
Nyob rau hauv cov cheeb tsam sov, calla lilies yog evergreen, tab sis qhov twg lub caij ntuj no kub poob qis qis, lawv yog deciduous. Cov nroj tsuag puas thaum kub poob qis dua 25 degrees Fahrenheit
Qhov no yog tib lub phylum ntawm tsiaj subkingdom Parazoa thiab sawv cev rau qhov tsawg tshaj plaws evolutionarily advanced pab pawg neeg ntawm lub nceeg vaj tsiaj. Sponges tsuas yog cov tsiaj uas tsis muaj cov ntaub so ntswg nrog loj ntawm cov cell embedded nyob rau hauv gelatinous matrix
Cov tsev neeg muaj nuj nqi yog pab pawg ua haujlwm nrog qhov zoo sib xws uas ua rau lawv yooj yim rau kev teeb tsa thaum koj paub txog kev ua haujlwm ntawm niam txiv, qhov piv txwv yooj yim tshaj plaws ntawm daim ntawv. Ib qho parameter yog qhov sib txawv hauv cov kab zauv dav dav uas siv rau ntawm tus nqi tshwj xeeb txhawm rau tsim ib qho kev sib npaug
Cov ntu sib txuas yog cov kab kab uas sib npaug ntawm qhov ntev. Congruent txhais tias sib npaug. Cov kab sib txuas feem ntau yog qhia los ntawm kev kos tib tus nqi ntawm cov kab me me nyob rau hauv nruab nrab ntawm cov ntu, nyob rau ntawm ntu. Peb qhia ib kab los ntawm kos ib kab hla nws ob qhov kawg
Tus nqi ntawm kev nqus yog tus nqi uas tau txiav txim ua ntej uas cov nqi them nyiaj siv tau them rau cov khoom siv (xws li cov khoom, cov kev pabcuam, lossis cov neeg siv khoom). Qhov tshwm sim ntawm qhov nqus tau yog siv los faib nyiaj siv ua haujlwm rau cov khoom siv hauv lub sijhawm tam sim no
Synonyms ntawm 'marsh' Ntau thaj av yog suab puam lossis swamp. moss (Scottish, Northern England, lus) bog. Peb taug kev tsis tu ncua hla moor thiab bog. slough
Cov cuab yeej hauv kev tshawb fawb txhais tau tias: "Cov khoom ntawm cov teeb meem suav nrog txhua yam uas tuaj yeem ntsuas tau, xws li cov khoom qhov ntom ntom, xim, loj, ntim, ntev, malleability, melting point, hardness, ntxhiab, kub, thiab lwm yam. " Lub qab ntuj khwb yog qhov kaj thiab qhov kaj yog qhov khoom ntawm txhua yam teeb meem
Ib tug xov tooj ntawm pawg 14 elemental hydrides: CH4, SiH4, GeH4 & SnH4, yog inert rau Lewis acid thiab Lewis puag reagents. (Cov hom tuaj yeem raug oxidised thiab lawv raug cuam tshuam los ntawm radicals thiab diradicals.) Yog li methane yog Lewis puag tab sis, zoo li helium, nws yog ib qho tsis tshua muaj zog proton abstractor
Crown class yog ib lo lus siv los piav txog txoj hauj lwm ntawm ib tug neeg ntoo nyob rau hauv hav zoov canopy. Codominant ntoo Cov crowns ua rau cov theem ntawm cov canopy. Lawv tau txais lub teeb ncaj qha los ntawm saum toj no, tab sis me ntsis los yog tsis muaj teeb los ntawm ob sab. Feem ntau lawv luv dua li cov ntoo tseem ceeb
Muaj peb hom pob zeb loj: Metamorphic, Igneous, thiab Sedimentary. Metamorphic Pob Zeb - Cov pob zeb Metamorphic yog tsim los ntawm cov cua kub thiab siab. Lawv feem ntau pom nyob rau hauv lub ntiaj teb crust qhov twg muaj cua sov txaus thiab siab los tsim cov pob zeb. Qhov no hardened magma los yog lava yog hu ua igneous pob zeb
Cov ntsiab lus 2.1 Uranium-lead dating method. 2.2 Samarium-neodymium yos txoj kev. 2.3 Potassium-argon dating method. 2.4 Rubidium-strontium yos txoj kev. 2.5 Uranium-thorium yos txoj kev. 2.6 Radiocarbon dating method. 2.7 Fission taug kev sib tam txoj kev. 2.8 Chlorine-36 dating method
Kev hloov pauv ntau hauv qhov loj; lawv tuaj yeem cuam tshuam qhov twg los ntawm ib qho DNA tsev thaiv (hauv paus khub) mus rau ib ntu loj ntawm chromosome uas suav nrog ntau cov noob. Daim duab: Cov txheej txheem ntawm cov protein synthesis ua ntej tsim ib qho mRNA daim ntawv theej ntawm DNA ib ntus thaum tus txheej txheem ntawm transcription
Txhua lub neej yog tsim los ntawm plaub lub tsev macromolecule: carbohydrates, lipids, proteins, thiab nucleic acids. Kev sib cuam tshuam ntawm cov polymers sib txawv ntawm cov qauv molecule yooj yim no ua rau feem ntau ntawm lub neej cov qauv thiab kev ua haujlwm
Ntoo tshauv yog nruab nrab mus rau loj ntoo ntawm genus Fraxinus ntawm tsev neeg Oleaceae (Olive-ntoo zoo li). Tsev neeg muaj li ntawm 45 thiab 65 hom. Ib txhia ntawm lawv yog evergreen, tab sis feem ntau yog deciduous. Feem ntau ntawm cov ntoo tshauv muaj lub teeb-ntsuab, oval zoo li tus, pinnate nplooj
Ua kom kub nce ntxiv cov tshuaj tiv thaiv vim tias qhov tsis txaus ntseeg loj ntawm kev sib tsoo ntawm lub zog loj. Nws tsuas yog cov kev sib tsoo no (muaj tsawg kawg yog lub zog ua kom muaj zog rau cov tshuaj tiv thaiv) uas ua rau muaj kev cuam tshuam
Coulomb txoj cai lij choj hais tias: Qhov loj ntawm lub electrostatic quab yuam ntawm attraction los yog repulsion ntawm ob lub ntsiab lus nqi yog ncaj qha proportional rau cov khoom ntawm qhov loj ntawm cov nqi thiab inversely proportional rau lub square ntawm qhov deb ntawm lawv. Lub zog yog raws txoj kab ncaj nraim koom nrog lawv
Arabidopsis thaliana Thaliana yog thawj cov nroj tsuag uas tau paj nyob rau hauv qhov chaw, nyob rau hauv 1982 nyob rau hauv lub Soviet Salyut 7. Cov nroj tsuag no tau loj hlob nyob rau hauv ntau qhov chaw missions vim nws immense kev tshawb fawb nqi. Nws tsis yog ib qho khoom noj uas siv tau rau cov neeg caij nkoj, tab sis cov kev tshawb pom tau siv A
Cov kab ke ntawm kab sib npaug tuaj yeem tsuas muaj 0, 1, lossis ib qho kev daws teeb meem tsis kawg. Ob kab no tsis tuaj yeem hla ob zaug. Cov lus teb raug yog tias qhov system muaj ib qho kev daws teeb meem
Yog lawm. Lub SeCl4 molecule yog polar vim hais tias ib leeg khub ntawm nonbonding electrons nyob rau hauv lub valence plhaub ntawm lub selenium atom interacts nrog lub bonding khub ntawm electrons, ua rau ib tug spatial asymmetry ntawm lub dipole lub sij hawm ntawm lub polar Se-Cl bonds. Qhov tshwm sim yog SeCl4 molecule nrog lub sijhawm net dipole
Lub prefix 'iso' yog siv thaum tag nrho cov carbons tshwj tsis yog tsim cov saw txuas ntxiv. Cov ntawv ua ntej 'neo' yog siv thaum tag nrho tab sis ob lub carbons tsim cov saw txuas txuas ntxiv, thiab ob qho carbons no yog ib feem ntawm pawg davhlau ya nyob twg tert-butyl
Rau hom eruptions Icelandic. Hawaiian. Strombolian. Vulcanian. Pelan. Plinian
Piv txwv tus nqi feem pua ntawm cov zauv feem 25% 0.25 1/4 331/3% 0.333 1/3 50% 0.5 1/2 75% 0.75 3/4
Cell Organelle. Lub cev me me zoo li cov qauv uas muaj nyob hauv lub cell hu ua cell organelle. Single membrane-bound: Qee cov organelles raug khi los ntawm ib daim nyias nyias. Piv txwv li, vacuole, lysosome, Golgi Apparatus, Endoplasmic Reticulum thiab lwm yam